Merge pull request #734 from fatedier/mux

use yamux instead of smux

client/control.go

@@ -21,8 +21,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/xtaci/smux"
-
 	"github.com/fatedier/frp/g"
 	"github.com/fatedier/frp/models/config"
 	"github.com/fatedier/frp/models/msg"
@@ -32,6 +30,8 @@ import (
 	"github.com/fatedier/frp/utils/shutdown"
 	"github.com/fatedier/frp/utils/util"
 	"github.com/fatedier/frp/utils/version"
+
+	fmux "github.com/hashicorp/yamux"
 )
 
 const (
@@ -51,7 +51,7 @@ type Control struct {
 	conn frpNet.Conn
 
 	// tcp stream multiplexing, if enabled
-	session *smux.Session
+	session *fmux.Session
 
 	// put a message in this channel to send it over control connection to server
 	sendCh chan (msg.Message)
@@ -198,7 +198,7 @@ func (ctl *Control) login() (err error) {
 	}()
 
 	if g.GlbClientCfg.TcpMux {
-		session, errRet := smux.Client(conn, nil)
+		session, errRet := fmux.Client(conn, nil)
 		if errRet != nil {
 			return errRet
 		}

glide.lock

@@ -1,5 +1,5 @@
-hash: 367ad1f2515b51db9d04d5620fd88843fb6faabf303fe3103b896ef7a3f5a126
-updated: 2018-04-23T02:33:52.913905+08:00
+hash: e2a62cbc49d9da8ff95682f5c0b7731a7047afdd139acddb691c51ea98f726e1
+updated: 2018-04-25T02:41:38.15698+08:00
 imports:
 - name: github.com/armon/go-socks5
   version: e75332964ef517daa070d7c38a9466a0d687e0a5
@@ -17,6 +17,8 @@ imports:
   version: 5979233c5d6225d4a8e438cdd0b411888449ddab
 - name: github.com/gorilla/websocket
   version: ea4d1f681babbce9545c9c5f3d5194a789c89f5b
+- name: github.com/hashicorp/yamux
+  version: 2658be15c5f05e76244154714161f17e3e77de2e
 - name: github.com/inconshreveable/mousetrap
   version: 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
 - name: github.com/julienschmidt/httprouter
@@ -38,7 +40,7 @@ imports:
 - name: github.com/rodaine/table
   version: 212a2ad1c462ed4d5b5511ea2b480a573281dbbd
 - name: github.com/spf13/cobra
-  version: 615425954c3b0d9485a7027d4d451fdcdfdee84e
+  version: a1f051bc3eba734da4772d60e2d677f47cf93ef4
 - name: github.com/spf13/pflag
   version: 583c0c0531f06d5278b7d917446061adc344b5cd
 - name: github.com/stretchr/testify
@@ -57,8 +59,6 @@ imports:
   - sm4
 - name: github.com/vaughan0/go-ini
   version: a98ad7ee00ec53921f08832bc06ecf7fd600e6a1
-- name: github.com/xtaci/smux
-  version: 2de5471dfcbc029f5fe1392b83fe784127c4943e
 - name: golang.org/x/crypto
   version: e1a4589e7d3ea14a3352255d04b6f1a418845e5e
   subpackages:

glide.yaml

@@ -46,8 +46,6 @@ import:
   - sm4
 - package: github.com/vaughan0/go-ini
   version: a98ad7ee00ec53921f08832bc06ecf7fd600e6a1
-- package: github.com/xtaci/smux
-  version: 2de5471dfcbc029f5fe1392b83fe784127c4943e
 - package: golang.org/x/crypto
   version: e1a4589e7d3ea14a3352255d04b6f1a418845e5e
   subpackages:
@@ -71,3 +69,6 @@ import:
   version: v1.0.0
 - package: github.com/gorilla/websocket
   version: v1.2.0
+- package: github.com/hashicorp/yamux
+- package: github.com/spf13/cobra
+  version: v0.0.2

server/service.go

@@ -29,7 +29,7 @@ import (
 	"github.com/fatedier/frp/utils/version"
 	"github.com/fatedier/frp/utils/vhost"
 
-	"github.com/xtaci/smux"
+	fmux "github.com/hashicorp/yamux"
 )
 
 const (
@@ -234,7 +234,7 @@ func (svr *Service) HandleListener(l frpNet.Listener) {
 			}
 
 			if g.GlbServerCfg.TcpMux {
-				session, err := smux.Server(frpConn, nil)
+				session, err := fmux.Server(frpConn, nil)
 				if err != nil {
 					log.Warn("Failed to create mux connection: %v", err)
 					frpConn.Close()

vendor/github.com/xtaci/smux/.gitignore → vendor/github.com/hashicorp/yamux/.gitignore

@@ -21,4 +21,3 @@ _testmain.go
 
 *.exe
 *.test
-*.prof

vendor/github.com/hashicorp/yamux/LICENSE

@@ -0,0 +1,362 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. "Contributor"
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+
+     means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the terms of
+        a Secondary License.
+
+1.6. "Executable Form"
+
+     means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+
+     means a work that combines Covered Software with other material, in a
+     separate file or files, that is not Covered Software.
+
+1.8. "License"
+
+     means this document.
+
+1.9. "Licensable"
+
+     means having the right to grant, to the maximum extent possible, whether
+     at the time of the initial grant or subsequently, any and all of the
+     rights conveyed by this License.
+
+1.10. "Modifications"
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. "Patent Claims" of a Contributor
+
+      means any patent claim(s), including without limitation, method,
+      process, and apparatus claims, in any patent Licensable by such
+      Contributor that would be infringed, but for the grant of the License,
+      by the making, using, selling, offering for sale, having made, import,
+      or transfer of either its Contributions or its Contributor Version.
+
+1.12. "Secondary License"
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. "Source Code Form"
+
+      means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, "You" includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, "control" means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or
+        as part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its
+        Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution
+     become effective for each Contribution on the date the Contributor first
+     distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under
+     this License. No additional rights or licenses will be implied from the
+     distribution or licensing of Covered Software under this License.
+     Notwithstanding Section 2.1(b) above, no patent license is granted by a
+     Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party's
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of
+        its Contributions.
+
+     This License does not grant any rights in the trademarks, service marks,
+     or logos of any Contributor (except as may be necessary to comply with
+     the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this
+     License (see Section 10.2) or under the terms of a Secondary License (if
+     permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its
+     Contributions are its original creation(s) or it has sufficient rights to
+     grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under
+     applicable copyright doctrines of fair use, fair dealing, or other
+     equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under
+     the terms of this License. You must inform recipients that the Source
+     Code Form of the Covered Software is governed by the terms of this
+     License, and how they can obtain a copy of this License. You may not
+     attempt to alter or restrict the recipients' rights in the Source Code
+     Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this
+        License, or sublicense it under different terms, provided that the
+        license for the Executable Form does not attempt to limit or alter the
+        recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for
+     the Covered Software. If the Larger Work is a combination of Covered
+     Software with a work governed by one or more Secondary Licenses, and the
+     Covered Software is not Incompatible With Secondary Licenses, this
+     License permits You to additionally distribute such Covered Software
+     under the terms of such Secondary License(s), so that the recipient of
+     the Larger Work may, at their option, further distribute the Covered
+     Software under the terms of either this License or such Secondary
+     License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices
+     (including copyright notices, patent notices, disclaimers of warranty, or
+     limitations of liability) contained within the Source Code Form of the
+     Covered Software, except that You may alter any license notices to the
+     extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on
+     behalf of any Contributor. You must make it absolutely clear that any
+     such warranty, support, indemnity, or liability obligation is offered by
+     You alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute,
+   judicial order, or regulation then You must: (a) comply with the terms of
+   this License to the maximum extent possible; and (b) describe the
+   limitations and the code they affect. Such description must be placed in a
+   text file included with all distributions of the Covered Software under
+   this License. Except to the extent prohibited by statute or regulation,
+   such description must be sufficiently detailed for a recipient of ordinary
+   skill to be able to understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing
+     basis, if such Contributor fails to notify You of the non-compliance by
+     some reasonable means prior to 60 days after You have come back into
+     compliance. Moreover, Your grants from a particular Contributor are
+     reinstated on an ongoing basis if such Contributor notifies You of the
+     non-compliance by some reasonable means, this is the first time You have
+     received notice of non-compliance with this License from such
+     Contributor, and You become compliant prior to 30 days after Your receipt
+     of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions,
+     counter-claims, and cross-claims) alleging that a Contributor Version
+     directly or indirectly infringes any patent, then the rights granted to
+     You by any and all Contributors for the Covered Software under Section
+     2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an "as is" basis,
+   without warranty of any kind, either expressed, implied, or statutory,
+   including, without limitation, warranties that the Covered Software is free
+   of defects, merchantable, fit for a particular purpose or non-infringing.
+   The entire risk as to the quality and performance of the Covered Software
+   is with You. Should any Covered Software prove defective in any respect,
+   You (not any Contributor) assume the cost of any necessary servicing,
+   repair, or correction. This disclaimer of warranty constitutes an essential
+   part of this License. No use of  any Covered Software is authorized under
+   this License except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from
+   such party's negligence to the extent applicable law prohibits such
+   limitation. Some jurisdictions do not allow the exclusion or limitation of
+   incidental or consequential damages, so this exclusion and limitation may
+   not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts
+   of a jurisdiction where the defendant maintains its principal place of
+   business and such litigation shall be governed by laws of that
+   jurisdiction, without reference to its conflict-of-law provisions. Nothing
+   in this Section shall prevent a party's ability to bring cross-claims or
+   counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject
+   matter hereof. If any provision of this License is held to be
+   unenforceable, such provision shall be reformed only to the extent
+   necessary to make it enforceable. Any law or regulation which provides that
+   the language of a contract shall be construed against the drafter shall not
+   be used to construe this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version
+      of the License under which You originally received the Covered Software,
+      or under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a
+      modified version of this License if you rename the license and remove
+      any references to the name of the license steward (except to note that
+      such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+      Licenses If You choose to distribute Source Code Form that is
+      Incompatible With Secondary Licenses under the terms of this version of
+      the License, the notice described in Exhibit B of this License must be
+      attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file,
+then You may include the notice in a location (such as a LICENSE file in a
+relevant directory) where a recipient would be likely to look for such a
+notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+
+      This Source Code Form is "Incompatible
+      With Secondary Licenses", as defined by
+      the Mozilla Public License, v. 2.0.

vendor/github.com/hashicorp/yamux/README.md

@@ -0,0 +1,86 @@
+# Yamux
+
+Yamux (Yet another Multiplexer) is a multiplexing library for Golang.
+It relies on an underlying connection to provide reliability
+and ordering, such as TCP or Unix domain sockets, and provides
+stream-oriented multiplexing. It is inspired by SPDY but is not
+interoperable with it.
+
+Yamux features include:
+
+* Bi-directional streams
+  * Streams can be opened by either client or server
+  * Useful for NAT traversal
+  * Server-side push support
+* Flow control
+  * Avoid starvation
+  * Back-pressure to prevent overwhelming a receiver
+* Keep Alives
+  * Enables persistent connections over a load balancer
+* Efficient
+  * Enables thousands of logical streams with low overhead
+
+## Documentation
+
+For complete documentation, see the associated [Godoc](http://godoc.org/github.com/hashicorp/yamux).
+
+## Specification
+
+The full specification for Yamux is provided in the `spec.md` file.
+It can be used as a guide to implementors of interoperable libraries.
+
+## Usage
+
+Using Yamux is remarkably simple:
+
+```go
+
+func client() {
+    // Get a TCP connection
+    conn, err := net.Dial(...)
+    if err != nil {
+        panic(err)
+    }
+
+    // Setup client side of yamux
+    session, err := yamux.Client(conn, nil)
+    if err != nil {
+        panic(err)
+    }
+
+    // Open a new stream
+    stream, err := session.Open()
+    if err != nil {
+        panic(err)
+    }
+
+    // Stream implements net.Conn
+    stream.Write([]byte("ping"))
+}
+
+func server() {
+    // Accept a TCP connection
+    conn, err := listener.Accept()
+    if err != nil {
+        panic(err)
+    }
+
+    // Setup server side of yamux
+    session, err := yamux.Server(conn, nil)
+    if err != nil {
+        panic(err)
+    }
+
+    // Accept a stream
+    stream, err := session.Accept()
+    if err != nil {
+        panic(err)
+    }
+
+    // Listen for a message
+    buf := make([]byte, 4)
+    stream.Read(buf)
+}
+
+```
+

vendor/github.com/hashicorp/yamux/addr.go

@@ -0,0 +1,60 @@
+package yamux
+
+import (
+	"fmt"
+	"net"
+)
+
+// hasAddr is used to get the address from the underlying connection
+type hasAddr interface {
+	LocalAddr() net.Addr
+	RemoteAddr() net.Addr
+}
+
+// yamuxAddr is used when we cannot get the underlying address
+type yamuxAddr struct {
+	Addr string
+}
+
+func (*yamuxAddr) Network() string {
+	return "yamux"
+}
+
+func (y *yamuxAddr) String() string {
+	return fmt.Sprintf("yamux:%s", y.Addr)
+}
+
+// Addr is used to get the address of the listener.
+func (s *Session) Addr() net.Addr {
+	return s.LocalAddr()
+}
+
+// LocalAddr is used to get the local address of the
+// underlying connection.
+func (s *Session) LocalAddr() net.Addr {
+	addr, ok := s.conn.(hasAddr)
+	if !ok {
+		return &yamuxAddr{"local"}
+	}
+	return addr.LocalAddr()
+}
+
+// RemoteAddr is used to get the address of remote end
+// of the underlying connection
+func (s *Session) RemoteAddr() net.Addr {
+	addr, ok := s.conn.(hasAddr)
+	if !ok {
+		return &yamuxAddr{"remote"}
+	}
+	return addr.RemoteAddr()
+}
+
+// LocalAddr returns the local address
+func (s *Stream) LocalAddr() net.Addr {
+	return s.session.LocalAddr()
+}
+
+// LocalAddr returns the remote address
+func (s *Stream) RemoteAddr() net.Addr {
+	return s.session.RemoteAddr()
+}

vendor/github.com/hashicorp/yamux/bench_test.go

@@ -0,0 +1,123 @@
+package yamux
+
+import (
+	"testing"
+)
+
+func BenchmarkPing(b *testing.B) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	for i := 0; i < b.N; i++ {
+		rtt, err := client.Ping()
+		if err != nil {
+			b.Fatalf("err: %v", err)
+		}
+		if rtt == 0 {
+			b.Fatalf("bad: %v", rtt)
+		}
+	}
+}
+
+func BenchmarkAccept(b *testing.B) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	go func() {
+		for i := 0; i < b.N; i++ {
+			stream, err := server.AcceptStream()
+			if err != nil {
+				return
+			}
+			stream.Close()
+		}
+	}()
+
+	for i := 0; i < b.N; i++ {
+		stream, err := client.Open()
+		if err != nil {
+			b.Fatalf("err: %v", err)
+		}
+		stream.Close()
+	}
+}
+
+func BenchmarkSendRecv(b *testing.B) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	sendBuf := make([]byte, 512)
+	recvBuf := make([]byte, 512)
+
+	doneCh := make(chan struct{})
+	go func() {
+		stream, err := server.AcceptStream()
+		if err != nil {
+			return
+		}
+		defer stream.Close()
+		for i := 0; i < b.N; i++ {
+			if _, err := stream.Read(recvBuf); err != nil {
+				b.Fatalf("err: %v", err)
+			}
+		}
+		close(doneCh)
+	}()
+
+	stream, err := client.Open()
+	if err != nil {
+		b.Fatalf("err: %v", err)
+	}
+	defer stream.Close()
+	for i := 0; i < b.N; i++ {
+		if _, err := stream.Write(sendBuf); err != nil {
+			b.Fatalf("err: %v", err)
+		}
+	}
+	<-doneCh
+}
+
+func BenchmarkSendRecvLarge(b *testing.B) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+	const sendSize = 512 * 1024 * 1024
+	const recvSize = 4 * 1024
+
+	sendBuf := make([]byte, sendSize)
+	recvBuf := make([]byte, recvSize)
+
+	b.ResetTimer()
+	recvDone := make(chan struct{})
+
+	go func() {
+		stream, err := server.AcceptStream()
+		if err != nil {
+			return
+		}
+		defer stream.Close()
+		for i := 0; i < b.N; i++ {
+			for j := 0; j < sendSize/recvSize; j++ {
+				if _, err := stream.Read(recvBuf); err != nil {
+					b.Fatalf("err: %v", err)
+				}
+			}
+		}
+		close(recvDone)
+	}()
+
+	stream, err := client.Open()
+	if err != nil {
+		b.Fatalf("err: %v", err)
+	}
+	defer stream.Close()
+	for i := 0; i < b.N; i++ {
+		if _, err := stream.Write(sendBuf); err != nil {
+			b.Fatalf("err: %v", err)
+		}
+	}
+	<-recvDone
+}

vendor/github.com/hashicorp/yamux/const.go

@@ -0,0 +1,157 @@
+package yamux
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+var (
+	// ErrInvalidVersion means we received a frame with an
+	// invalid version
+	ErrInvalidVersion = fmt.Errorf("invalid protocol version")
+
+	// ErrInvalidMsgType means we received a frame with an
+	// invalid message type
+	ErrInvalidMsgType = fmt.Errorf("invalid msg type")
+
+	// ErrSessionShutdown is used if there is a shutdown during
+	// an operation
+	ErrSessionShutdown = fmt.Errorf("session shutdown")
+
+	// ErrStreamsExhausted is returned if we have no more
+	// stream ids to issue
+	ErrStreamsExhausted = fmt.Errorf("streams exhausted")
+
+	// ErrDuplicateStream is used if a duplicate stream is
+	// opened inbound
+	ErrDuplicateStream = fmt.Errorf("duplicate stream initiated")
+
+	// ErrReceiveWindowExceeded indicates the window was exceeded
+	ErrRecvWindowExceeded = fmt.Errorf("recv window exceeded")
+
+	// ErrTimeout is used when we reach an IO deadline
+	ErrTimeout = fmt.Errorf("i/o deadline reached")
+
+	// ErrStreamClosed is returned when using a closed stream
+	ErrStreamClosed = fmt.Errorf("stream closed")
+
+	// ErrUnexpectedFlag is set when we get an unexpected flag
+	ErrUnexpectedFlag = fmt.Errorf("unexpected flag")
+
+	// ErrRemoteGoAway is used when we get a go away from the other side
+	ErrRemoteGoAway = fmt.Errorf("remote end is not accepting connections")
+
+	// ErrConnectionReset is sent if a stream is reset. This can happen
+	// if the backlog is exceeded, or if there was a remote GoAway.
+	ErrConnectionReset = fmt.Errorf("connection reset")
+
+	// ErrConnectionWriteTimeout indicates that we hit the "safety valve"
+	// timeout writing to the underlying stream connection.
+	ErrConnectionWriteTimeout = fmt.Errorf("connection write timeout")
+
+	// ErrKeepAliveTimeout is sent if a missed keepalive caused the stream close
+	ErrKeepAliveTimeout = fmt.Errorf("keepalive timeout")
+)
+
+const (
+	// protoVersion is the only version we support
+	protoVersion uint8 = 0
+)
+
+const (
+	// Data is used for data frames. They are followed
+	// by length bytes worth of payload.
+	typeData uint8 = iota
+
+	// WindowUpdate is used to change the window of
+	// a given stream. The length indicates the delta
+	// update to the window.
+	typeWindowUpdate
+
+	// Ping is sent as a keep-alive or to measure
+	// the RTT. The StreamID and Length value are echoed
+	// back in the response.
+	typePing
+
+	// GoAway is sent to terminate a session. The StreamID
+	// should be 0 and the length is an error code.
+	typeGoAway
+)
+
+const (
+	// SYN is sent to signal a new stream. May
+	// be sent with a data payload
+	flagSYN uint16 = 1 << iota
+
+	// ACK is sent to acknowledge a new stream. May
+	// be sent with a data payload
+	flagACK
+
+	// FIN is sent to half-close the given stream.
+	// May be sent with a data payload.
+	flagFIN
+
+	// RST is used to hard close a given stream.
+	flagRST
+)
+
+const (
+	// initialStreamWindow is the initial stream window size
+	initialStreamWindow uint32 = 256 * 1024
+)
+
+const (
+	// goAwayNormal is sent on a normal termination
+	goAwayNormal uint32 = iota
+
+	// goAwayProtoErr sent on a protocol error
+	goAwayProtoErr
+
+	// goAwayInternalErr sent on an internal error
+	goAwayInternalErr
+)
+
+const (
+	sizeOfVersion  = 1
+	sizeOfType     = 1
+	sizeOfFlags    = 2
+	sizeOfStreamID = 4
+	sizeOfLength   = 4
+	headerSize     = sizeOfVersion + sizeOfType + sizeOfFlags +
+		sizeOfStreamID + sizeOfLength
+)
+
+type header []byte
+
+func (h header) Version() uint8 {
+	return h[0]
+}
+
+func (h header) MsgType() uint8 {
+	return h[1]
+}
+
+func (h header) Flags() uint16 {
+	return binary.BigEndian.Uint16(h[2:4])
+}
+
+func (h header) StreamID() uint32 {
+	return binary.BigEndian.Uint32(h[4:8])
+}
+
+func (h header) Length() uint32 {
+	return binary.BigEndian.Uint32(h[8:12])
+}
+
+func (h header) String() string {
+	return fmt.Sprintf("Vsn:%d Type:%d Flags:%d StreamID:%d Length:%d",
+		h.Version(), h.MsgType(), h.Flags(), h.StreamID(), h.Length())
+}
+
+func (h header) encode(msgType uint8, flags uint16, streamID uint32, length uint32) {
+	h[0] = protoVersion
+	h[1] = msgType
+	binary.BigEndian.PutUint16(h[2:4], flags)
+	binary.BigEndian.PutUint32(h[4:8], streamID)
+	binary.BigEndian.PutUint32(h[8:12], length)
+}

vendor/github.com/hashicorp/yamux/const_test.go

@@ -0,0 +1,72 @@
+package yamux
+
+import (
+	"testing"
+)
+
+func TestConst(t *testing.T) {
+	if protoVersion != 0 {
+		t.Fatalf("bad: %v", protoVersion)
+	}
+
+	if typeData != 0 {
+		t.Fatalf("bad: %v", typeData)
+	}
+	if typeWindowUpdate != 1 {
+		t.Fatalf("bad: %v", typeWindowUpdate)
+	}
+	if typePing != 2 {
+		t.Fatalf("bad: %v", typePing)
+	}
+	if typeGoAway != 3 {
+		t.Fatalf("bad: %v", typeGoAway)
+	}
+
+	if flagSYN != 1 {
+		t.Fatalf("bad: %v", flagSYN)
+	}
+	if flagACK != 2 {
+		t.Fatalf("bad: %v", flagACK)
+	}
+	if flagFIN != 4 {
+		t.Fatalf("bad: %v", flagFIN)
+	}
+	if flagRST != 8 {
+		t.Fatalf("bad: %v", flagRST)
+	}
+
+	if goAwayNormal != 0 {
+		t.Fatalf("bad: %v", goAwayNormal)
+	}
+	if goAwayProtoErr != 1 {
+		t.Fatalf("bad: %v", goAwayProtoErr)
+	}
+	if goAwayInternalErr != 2 {
+		t.Fatalf("bad: %v", goAwayInternalErr)
+	}
+
+	if headerSize != 12 {
+		t.Fatalf("bad header size")
+	}
+}
+
+func TestEncodeDecode(t *testing.T) {
+	hdr := header(make([]byte, headerSize))
+	hdr.encode(typeWindowUpdate, flagACK|flagRST, 1234, 4321)
+
+	if hdr.Version() != protoVersion {
+		t.Fatalf("bad: %v", hdr)
+	}
+	if hdr.MsgType() != typeWindowUpdate {
+		t.Fatalf("bad: %v", hdr)
+	}
+	if hdr.Flags() != flagACK|flagRST {
+		t.Fatalf("bad: %v", hdr)
+	}
+	if hdr.StreamID() != 1234 {
+		t.Fatalf("bad: %v", hdr)
+	}
+	if hdr.Length() != 4321 {
+		t.Fatalf("bad: %v", hdr)
+	}
+}

vendor/github.com/hashicorp/yamux/mux.go

@@ -0,0 +1,87 @@
+package yamux
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"time"
+)
+
+// Config is used to tune the Yamux session
+type Config struct {
+	// AcceptBacklog is used to limit how many streams may be
+	// waiting an accept.
+	AcceptBacklog int
+
+	// EnableKeepalive is used to do a period keep alive
+	// messages using a ping.
+	EnableKeepAlive bool
+
+	// KeepAliveInterval is how often to perform the keep alive
+	KeepAliveInterval time.Duration
+
+	// ConnectionWriteTimeout is meant to be a "safety valve" timeout after
+	// we which will suspect a problem with the underlying connection and
+	// close it. This is only applied to writes, where's there's generally
+	// an expectation that things will move along quickly.
+	ConnectionWriteTimeout time.Duration
+
+	// MaxStreamWindowSize is used to control the maximum
+	// window size that we allow for a stream.
+	MaxStreamWindowSize uint32
+
+	// LogOutput is used to control the log destination
+	LogOutput io.Writer
+}
+
+// DefaultConfig is used to return a default configuration
+func DefaultConfig() *Config {
+	return &Config{
+		AcceptBacklog:          256,
+		EnableKeepAlive:        true,
+		KeepAliveInterval:      30 * time.Second,
+		ConnectionWriteTimeout: 10 * time.Second,
+		MaxStreamWindowSize:    initialStreamWindow,
+		LogOutput:              os.Stderr,
+	}
+}
+
+// VerifyConfig is used to verify the sanity of configuration
+func VerifyConfig(config *Config) error {
+	if config.AcceptBacklog <= 0 {
+		return fmt.Errorf("backlog must be positive")
+	}
+	if config.KeepAliveInterval == 0 {
+		return fmt.Errorf("keep-alive interval must be positive")
+	}
+	if config.MaxStreamWindowSize < initialStreamWindow {
+		return fmt.Errorf("MaxStreamWindowSize must be larger than %d", initialStreamWindow)
+	}
+	return nil
+}
+
+// Server is used to initialize a new server-side connection.
+// There must be at most one server-side connection. If a nil config is
+// provided, the DefaultConfiguration will be used.
+func Server(conn io.ReadWriteCloser, config *Config) (*Session, error) {
+	if config == nil {
+		config = DefaultConfig()
+	}
+	if err := VerifyConfig(config); err != nil {
+		return nil, err
+	}
+	return newSession(config, conn, false), nil
+}
+
+// Client is used to initialize a new client-side connection.
+// There must be at most one client-side connection.
+func Client(conn io.ReadWriteCloser, config *Config) (*Session, error) {
+	if config == nil {
+		config = DefaultConfig()
+	}
+
+	if err := VerifyConfig(config); err != nil {
+		return nil, err
+	}
+	return newSession(config, conn, true), nil
+}

vendor/github.com/hashicorp/yamux/session.go

@@ -0,0 +1,646 @@
+package yamux
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"math"
+	"net"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+// Session is used to wrap a reliable ordered connection and to
+// multiplex it into multiple streams.
+type Session struct {
+	// remoteGoAway indicates the remote side does
+	// not want futher connections. Must be first for alignment.
+	remoteGoAway int32
+
+	// localGoAway indicates that we should stop
+	// accepting futher connections. Must be first for alignment.
+	localGoAway int32
+
+	// nextStreamID is the next stream we should
+	// send. This depends if we are a client/server.
+	nextStreamID uint32
+
+	// config holds our configuration
+	config *Config
+
+	// logger is used for our logs
+	logger *log.Logger
+
+	// conn is the underlying connection
+	conn io.ReadWriteCloser
+
+	// bufRead is a buffered reader
+	bufRead *bufio.Reader
+
+	// pings is used to track inflight pings
+	pings    map[uint32]chan struct{}
+	pingID   uint32
+	pingLock sync.Mutex
+
+	// streams maps a stream id to a stream, and inflight has an entry
+	// for any outgoing stream that has not yet been established. Both are
+	// protected by streamLock.
+	streams    map[uint32]*Stream
+	inflight   map[uint32]struct{}
+	streamLock sync.Mutex
+
+	// synCh acts like a semaphore. It is sized to the AcceptBacklog which
+	// is assumed to be symmetric between the client and server. This allows
+	// the client to avoid exceeding the backlog and instead blocks the open.
+	synCh chan struct{}
+
+	// acceptCh is used to pass ready streams to the client
+	acceptCh chan *Stream
+
+	// sendCh is used to mark a stream as ready to send,
+	// or to send a header out directly.
+	sendCh chan sendReady
+
+	// recvDoneCh is closed when recv() exits to avoid a race
+	// between stream registration and stream shutdown
+	recvDoneCh chan struct{}
+
+	// shutdown is used to safely close a session
+	shutdown     bool
+	shutdownErr  error
+	shutdownCh   chan struct{}
+	shutdownLock sync.Mutex
+}
+
+// sendReady is used to either mark a stream as ready
+// or to directly send a header
+type sendReady struct {
+	Hdr  []byte
+	Body io.Reader
+	Err  chan error
+}
+
+// newSession is used to construct a new session
+func newSession(config *Config, conn io.ReadWriteCloser, client bool) *Session {
+	s := &Session{
+		config:     config,
+		logger:     log.New(config.LogOutput, "", log.LstdFlags),
+		conn:       conn,
+		bufRead:    bufio.NewReader(conn),
+		pings:      make(map[uint32]chan struct{}),
+		streams:    make(map[uint32]*Stream),
+		inflight:   make(map[uint32]struct{}),
+		synCh:      make(chan struct{}, config.AcceptBacklog),
+		acceptCh:   make(chan *Stream, config.AcceptBacklog),
+		sendCh:     make(chan sendReady, 64),
+		recvDoneCh: make(chan struct{}),
+		shutdownCh: make(chan struct{}),
+	}
+	if client {
+		s.nextStreamID = 1
+	} else {
+		s.nextStreamID = 2
+	}
+	go s.recv()
+	go s.send()
+	if config.EnableKeepAlive {
+		go s.keepalive()
+	}
+	return s
+}
+
+// IsClosed does a safe check to see if we have shutdown
+func (s *Session) IsClosed() bool {
+	select {
+	case <-s.shutdownCh:
+		return true
+	default:
+		return false
+	}
+}
+
+// CloseChan returns a read-only channel which is closed as
+// soon as the session is closed.
+func (s *Session) CloseChan() <-chan struct{} {
+	return s.shutdownCh
+}
+
+// NumStreams returns the number of currently open streams
+func (s *Session) NumStreams() int {
+	s.streamLock.Lock()
+	num := len(s.streams)
+	s.streamLock.Unlock()
+	return num
+}
+
+// Open is used to create a new stream as a net.Conn
+func (s *Session) Open() (net.Conn, error) {
+	conn, err := s.OpenStream()
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}
+
+// OpenStream is used to create a new stream
+func (s *Session) OpenStream() (*Stream, error) {
+	if s.IsClosed() {
+		return nil, ErrSessionShutdown
+	}
+	if atomic.LoadInt32(&s.remoteGoAway) == 1 {
+		return nil, ErrRemoteGoAway
+	}
+
+	// Block if we have too many inflight SYNs
+	select {
+	case s.synCh <- struct{}{}:
+	case <-s.shutdownCh:
+		return nil, ErrSessionShutdown
+	}
+
+GET_ID:
+	// Get an ID, and check for stream exhaustion
+	id := atomic.LoadUint32(&s.nextStreamID)
+	if id >= math.MaxUint32-1 {
+		return nil, ErrStreamsExhausted
+	}
+	if !atomic.CompareAndSwapUint32(&s.nextStreamID, id, id+2) {
+		goto GET_ID
+	}
+
+	// Register the stream
+	stream := newStream(s, id, streamInit)
+	s.streamLock.Lock()
+	s.streams[id] = stream
+	s.inflight[id] = struct{}{}
+	s.streamLock.Unlock()
+
+	// Send the window update to create
+	if err := stream.sendWindowUpdate(); err != nil {
+		select {
+		case <-s.synCh:
+		default:
+			s.logger.Printf("[ERR] yamux: aborted stream open without inflight syn semaphore")
+		}
+		return nil, err
+	}
+	return stream, nil
+}
+
+// Accept is used to block until the next available stream
+// is ready to be accepted.
+func (s *Session) Accept() (net.Conn, error) {
+	conn, err := s.AcceptStream()
+	if err != nil {
+		return nil, err
+	}
+	return conn, err
+}
+
+// AcceptStream is used to block until the next available stream
+// is ready to be accepted.
+func (s *Session) AcceptStream() (*Stream, error) {
+	select {
+	case stream := <-s.acceptCh:
+		if err := stream.sendWindowUpdate(); err != nil {
+			return nil, err
+		}
+		return stream, nil
+	case <-s.shutdownCh:
+		return nil, s.shutdownErr
+	}
+}
+
+// Close is used to close the session and all streams.
+// Attempts to send a GoAway before closing the connection.
+func (s *Session) Close() error {
+	s.shutdownLock.Lock()
+	defer s.shutdownLock.Unlock()
+
+	if s.shutdown {
+		return nil
+	}
+	s.shutdown = true
+	if s.shutdownErr == nil {
+		s.shutdownErr = ErrSessionShutdown
+	}
+	close(s.shutdownCh)
+	s.conn.Close()
+	<-s.recvDoneCh
+
+	s.streamLock.Lock()
+	defer s.streamLock.Unlock()
+	for _, stream := range s.streams {
+		stream.forceClose()
+	}
+	return nil
+}
+
+// exitErr is used to handle an error that is causing the
+// session to terminate.
+func (s *Session) exitErr(err error) {
+	s.shutdownLock.Lock()
+	if s.shutdownErr == nil {
+		s.shutdownErr = err
+	}
+	s.shutdownLock.Unlock()
+	s.Close()
+}
+
+// GoAway can be used to prevent accepting further
+// connections. It does not close the underlying conn.
+func (s *Session) GoAway() error {
+	return s.waitForSend(s.goAway(goAwayNormal), nil)
+}
+
+// goAway is used to send a goAway message
+func (s *Session) goAway(reason uint32) header {
+	atomic.SwapInt32(&s.localGoAway, 1)
+	hdr := header(make([]byte, headerSize))
+	hdr.encode(typeGoAway, 0, 0, reason)
+	return hdr
+}
+
+// Ping is used to measure the RTT response time
+func (s *Session) Ping() (time.Duration, error) {
+	// Get a channel for the ping
+	ch := make(chan struct{})
+
+	// Get a new ping id, mark as pending
+	s.pingLock.Lock()
+	id := s.pingID
+	s.pingID++
+	s.pings[id] = ch
+	s.pingLock.Unlock()
+
+	// Send the ping request
+	hdr := header(make([]byte, headerSize))
+	hdr.encode(typePing, flagSYN, 0, id)
+	if err := s.waitForSend(hdr, nil); err != nil {
+		return 0, err
+	}
+
+	// Wait for a response
+	start := time.Now()
+	select {
+	case <-ch:
+	case <-time.After(s.config.ConnectionWriteTimeout):
+		s.pingLock.Lock()
+		delete(s.pings, id) // Ignore it if a response comes later.
+		s.pingLock.Unlock()
+		return 0, ErrTimeout
+	case <-s.shutdownCh:
+		return 0, ErrSessionShutdown
+	}
+
+	// Compute the RTT
+	return time.Now().Sub(start), nil
+}
+
+// keepalive is a long running goroutine that periodically does
+// a ping to keep the connection alive.
+func (s *Session) keepalive() {
+	for {
+		select {
+		case <-time.After(s.config.KeepAliveInterval):
+			_, err := s.Ping()
+			if err != nil {
+				s.logger.Printf("[ERR] yamux: keepalive failed: %v", err)
+				s.exitErr(ErrKeepAliveTimeout)
+				return
+			}
+		case <-s.shutdownCh:
+			return
+		}
+	}
+}
+
+// waitForSendErr waits to send a header, checking for a potential shutdown
+func (s *Session) waitForSend(hdr header, body io.Reader) error {
+	errCh := make(chan error, 1)
+	return s.waitForSendErr(hdr, body, errCh)
+}
+
+// waitForSendErr waits to send a header with optional data, checking for a
+// potential shutdown. Since there's the expectation that sends can happen
+// in a timely manner, we enforce the connection write timeout here.
+func (s *Session) waitForSendErr(hdr header, body io.Reader, errCh chan error) error {
+	t := timerPool.Get()
+	timer := t.(*time.Timer)
+	timer.Reset(s.config.ConnectionWriteTimeout)
+	defer func() {
+		timer.Stop()
+		select {
+		case <-timer.C:
+		default:
+		}
+		timerPool.Put(t)
+	}()
+
+	ready := sendReady{Hdr: hdr, Body: body, Err: errCh}
+	select {
+	case s.sendCh <- ready:
+	case <-s.shutdownCh:
+		return ErrSessionShutdown
+	case <-timer.C:
+		return ErrConnectionWriteTimeout
+	}
+
+	select {
+	case err := <-errCh:
+		return err
+	case <-s.shutdownCh:
+		return ErrSessionShutdown
+	case <-timer.C:
+		return ErrConnectionWriteTimeout
+	}
+}
+
+// sendNoWait does a send without waiting. Since there's the expectation that
+// the send happens right here, we enforce the connection write timeout if we
+// can't queue the header to be sent.
+func (s *Session) sendNoWait(hdr header) error {
+	t := timerPool.Get()
+	timer := t.(*time.Timer)
+	timer.Reset(s.config.ConnectionWriteTimeout)
+	defer func() {
+		timer.Stop()
+		select {
+		case <-timer.C:
+		default:
+		}
+		timerPool.Put(t)
+	}()
+
+	select {
+	case s.sendCh <- sendReady{Hdr: hdr}:
+		return nil
+	case <-s.shutdownCh:
+		return ErrSessionShutdown
+	case <-timer.C:
+		return ErrConnectionWriteTimeout
+	}
+}
+
+// send is a long running goroutine that sends data
+func (s *Session) send() {
+	for {
+		select {
+		case ready := <-s.sendCh:
+			// Send a header if ready
+			if ready.Hdr != nil {
+				sent := 0
+				for sent < len(ready.Hdr) {
+					n, err := s.conn.Write(ready.Hdr[sent:])
+					if err != nil {
+						s.logger.Printf("[ERR] yamux: Failed to write header: %v", err)
+						asyncSendErr(ready.Err, err)
+						s.exitErr(err)
+						return
+					}
+					sent += n
+				}
+			}
+
+			// Send data from a body if given
+			if ready.Body != nil {
+				_, err := io.Copy(s.conn, ready.Body)
+				if err != nil {
+					s.logger.Printf("[ERR] yamux: Failed to write body: %v", err)
+					asyncSendErr(ready.Err, err)
+					s.exitErr(err)
+					return
+				}
+			}
+
+			// No error, successful send
+			asyncSendErr(ready.Err, nil)
+		case <-s.shutdownCh:
+			return
+		}
+	}
+}
+
+// recv is a long running goroutine that accepts new data
+func (s *Session) recv() {
+	if err := s.recvLoop(); err != nil {
+		s.exitErr(err)
+	}
+}
+
+// Ensure that the index of the handler (typeData/typeWindowUpdate/etc) matches the message type
+var (
+	handlers = []func(*Session, header) error{
+		typeData:         (*Session).handleStreamMessage,
+		typeWindowUpdate: (*Session).handleStreamMessage,
+		typePing:         (*Session).handlePing,
+		typeGoAway:       (*Session).handleGoAway,
+	}
+)
+
+// recvLoop continues to receive data until a fatal error is encountered
+func (s *Session) recvLoop() error {
+	defer close(s.recvDoneCh)
+	hdr := header(make([]byte, headerSize))
+	for {
+		// Read the header
+		if _, err := io.ReadFull(s.bufRead, hdr); err != nil {
+			if err != io.EOF && !strings.Contains(err.Error(), "closed") && !strings.Contains(err.Error(), "reset by peer") {
+				s.logger.Printf("[ERR] yamux: Failed to read header: %v", err)
+			}
+			return err
+		}
+
+		// Verify the version
+		if hdr.Version() != protoVersion {
+			s.logger.Printf("[ERR] yamux: Invalid protocol version: %d", hdr.Version())
+			return ErrInvalidVersion
+		}
+
+		mt := hdr.MsgType()
+		if mt < typeData || mt > typeGoAway {
+			return ErrInvalidMsgType
+		}
+
+		if err := handlers[mt](s, hdr); err != nil {
+			return err
+		}
+	}
+}
+
+// handleStreamMessage handles either a data or window update frame
+func (s *Session) handleStreamMessage(hdr header) error {
+	// Check for a new stream creation
+	id := hdr.StreamID()
+	flags := hdr.Flags()
+	if flags&flagSYN == flagSYN {
+		if err := s.incomingStream(id); err != nil {
+			return err
+		}
+	}
+
+	// Get the stream
+	s.streamLock.Lock()
+	stream := s.streams[id]
+	s.streamLock.Unlock()
+
+	// If we do not have a stream, likely we sent a RST
+	if stream == nil {
+		// Drain any data on the wire
+		if hdr.MsgType() == typeData && hdr.Length() > 0 {
+			s.logger.Printf("[WARN] yamux: Discarding data for stream: %d", id)
+			if _, err := io.CopyN(ioutil.Discard, s.bufRead, int64(hdr.Length())); err != nil {
+				s.logger.Printf("[ERR] yamux: Failed to discard data: %v", err)
+				return nil
+			}
+		} else {
+			s.logger.Printf("[WARN] yamux: frame for missing stream: %v", hdr)
+		}
+		return nil
+	}
+
+	// Check if this is a window update
+	if hdr.MsgType() == typeWindowUpdate {
+		if err := stream.incrSendWindow(hdr, flags); err != nil {
+			if sendErr := s.sendNoWait(s.goAway(goAwayProtoErr)); sendErr != nil {
+				s.logger.Printf("[WARN] yamux: failed to send go away: %v", sendErr)
+			}
+			return err
+		}
+		return nil
+	}
+
+	// Read the new data
+	if err := stream.readData(hdr, flags, s.bufRead); err != nil {
+		if sendErr := s.sendNoWait(s.goAway(goAwayProtoErr)); sendErr != nil {
+			s.logger.Printf("[WARN] yamux: failed to send go away: %v", sendErr)
+		}
+		return err
+	}
+	return nil
+}
+
+// handlePing is invokde for a typePing frame
+func (s *Session) handlePing(hdr header) error {
+	flags := hdr.Flags()
+	pingID := hdr.Length()
+
+	// Check if this is a query, respond back in a separate context so we
+	// don't interfere with the receiving thread blocking for the write.
+	if flags&flagSYN == flagSYN {
+		go func() {
+			hdr := header(make([]byte, headerSize))
+			hdr.encode(typePing, flagACK, 0, pingID)
+			if err := s.sendNoWait(hdr); err != nil {
+				s.logger.Printf("[WARN] yamux: failed to send ping reply: %v", err)
+			}
+		}()
+		return nil
+	}
+
+	// Handle a response
+	s.pingLock.Lock()
+	ch := s.pings[pingID]
+	if ch != nil {
+		delete(s.pings, pingID)
+		close(ch)
+	}
+	s.pingLock.Unlock()
+	return nil
+}
+
+// handleGoAway is invokde for a typeGoAway frame
+func (s *Session) handleGoAway(hdr header) error {
+	code := hdr.Length()
+	switch code {
+	case goAwayNormal:
+		atomic.SwapInt32(&s.remoteGoAway, 1)
+	case goAwayProtoErr:
+		s.logger.Printf("[ERR] yamux: received protocol error go away")
+		return fmt.Errorf("yamux protocol error")
+	case goAwayInternalErr:
+		s.logger.Printf("[ERR] yamux: received internal error go away")
+		return fmt.Errorf("remote yamux internal error")
+	default:
+		s.logger.Printf("[ERR] yamux: received unexpected go away")
+		return fmt.Errorf("unexpected go away received")
+	}
+	return nil
+}
+
+// incomingStream is used to create a new incoming stream
+func (s *Session) incomingStream(id uint32) error {
+	// Reject immediately if we are doing a go away
+	if atomic.LoadInt32(&s.localGoAway) == 1 {
+		hdr := header(make([]byte, headerSize))
+		hdr.encode(typeWindowUpdate, flagRST, id, 0)
+		return s.sendNoWait(hdr)
+	}
+
+	// Allocate a new stream
+	stream := newStream(s, id, streamSYNReceived)
+
+	s.streamLock.Lock()
+	defer s.streamLock.Unlock()
+
+	// Check if stream already exists
+	if _, ok := s.streams[id]; ok {
+		s.logger.Printf("[ERR] yamux: duplicate stream declared")
+		if sendErr := s.sendNoWait(s.goAway(goAwayProtoErr)); sendErr != nil {
+			s.logger.Printf("[WARN] yamux: failed to send go away: %v", sendErr)
+		}
+		return ErrDuplicateStream
+	}
+
+	// Register the stream
+	s.streams[id] = stream
+
+	// Check if we've exceeded the backlog
+	select {
+	case s.acceptCh <- stream:
+		return nil
+	default:
+		// Backlog exceeded! RST the stream
+		s.logger.Printf("[WARN] yamux: backlog exceeded, forcing connection reset")
+		delete(s.streams, id)
+		stream.sendHdr.encode(typeWindowUpdate, flagRST, id, 0)
+		return s.sendNoWait(stream.sendHdr)
+	}
+}
+
+// closeStream is used to close a stream once both sides have
+// issued a close. If there was an in-flight SYN and the stream
+// was not yet established, then this will give the credit back.
+func (s *Session) closeStream(id uint32) {
+	s.streamLock.Lock()
+	if _, ok := s.inflight[id]; ok {
+		select {
+		case <-s.synCh:
+		default:
+			s.logger.Printf("[ERR] yamux: SYN tracking out of sync")
+		}
+	}
+	delete(s.streams, id)
+	s.streamLock.Unlock()
+}
+
+// establishStream is used to mark a stream that was in the
+// SYN Sent state as established.
+func (s *Session) establishStream(id uint32) {
+	s.streamLock.Lock()
+	if _, ok := s.inflight[id]; ok {
+		delete(s.inflight, id)
+	} else {
+		s.logger.Printf("[ERR] yamux: established stream without inflight SYN (no tracking entry)")
+	}
+	select {
+	case <-s.synCh:
+	default:
+		s.logger.Printf("[ERR] yamux: established stream without inflight SYN (didn't have semaphore)")
+	}
+	s.streamLock.Unlock()
+}

vendor/github.com/hashicorp/yamux/session_test.go

@@ -0,0 +1,1256 @@
+package yamux
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"reflect"
+	"runtime"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+type logCapture struct{ bytes.Buffer }
+
+func (l *logCapture) logs() []string {
+	return strings.Split(strings.TrimSpace(l.String()), "\n")
+}
+
+func (l *logCapture) match(expect []string) bool {
+	return reflect.DeepEqual(l.logs(), expect)
+}
+
+func captureLogs(s *Session) *logCapture {
+	buf := new(logCapture)
+	s.logger = log.New(buf, "", 0)
+	return buf
+}
+
+type pipeConn struct {
+	reader       *io.PipeReader
+	writer       *io.PipeWriter
+	writeBlocker sync.Mutex
+}
+
+func (p *pipeConn) Read(b []byte) (int, error) {
+	return p.reader.Read(b)
+}
+
+func (p *pipeConn) Write(b []byte) (int, error) {
+	p.writeBlocker.Lock()
+	defer p.writeBlocker.Unlock()
+	return p.writer.Write(b)
+}
+
+func (p *pipeConn) Close() error {
+	p.reader.Close()
+	return p.writer.Close()
+}
+
+func testConn() (io.ReadWriteCloser, io.ReadWriteCloser) {
+	read1, write1 := io.Pipe()
+	read2, write2 := io.Pipe()
+	conn1 := &pipeConn{reader: read1, writer: write2}
+	conn2 := &pipeConn{reader: read2, writer: write1}
+	return conn1, conn2
+}
+
+func testConf() *Config {
+	conf := DefaultConfig()
+	conf.AcceptBacklog = 64
+	conf.KeepAliveInterval = 100 * time.Millisecond
+	conf.ConnectionWriteTimeout = 250 * time.Millisecond
+	return conf
+}
+
+func testConfNoKeepAlive() *Config {
+	conf := testConf()
+	conf.EnableKeepAlive = false
+	return conf
+}
+
+func testClientServer() (*Session, *Session) {
+	return testClientServerConfig(testConf())
+}
+
+func testClientServerConfig(conf *Config) (*Session, *Session) {
+	conn1, conn2 := testConn()
+	client, _ := Client(conn1, conf)
+	server, _ := Server(conn2, conf)
+	return client, server
+}
+
+func TestPing(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	rtt, err := client.Ping()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if rtt == 0 {
+		t.Fatalf("bad: %v", rtt)
+	}
+
+	rtt, err = server.Ping()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if rtt == 0 {
+		t.Fatalf("bad: %v", rtt)
+	}
+}
+
+func TestPing_Timeout(t *testing.T) {
+	client, server := testClientServerConfig(testConfNoKeepAlive())
+	defer client.Close()
+	defer server.Close()
+
+	// Prevent the client from responding
+	clientConn := client.conn.(*pipeConn)
+	clientConn.writeBlocker.Lock()
+
+	errCh := make(chan error, 1)
+	go func() {
+		_, err := server.Ping() // Ping via the server session
+		errCh <- err
+	}()
+
+	select {
+	case err := <-errCh:
+		if err != ErrTimeout {
+			t.Fatalf("err: %v", err)
+		}
+	case <-time.After(client.config.ConnectionWriteTimeout * 2):
+		t.Fatalf("failed to timeout within expected %v", client.config.ConnectionWriteTimeout)
+	}
+
+	// Verify that we recover, even if we gave up
+	clientConn.writeBlocker.Unlock()
+
+	go func() {
+		_, err := server.Ping() // Ping via the server session
+		errCh <- err
+	}()
+
+	select {
+	case err := <-errCh:
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	case <-time.After(client.config.ConnectionWriteTimeout):
+		t.Fatalf("timeout")
+	}
+}
+
+func TestCloseBeforeAck(t *testing.T) {
+	cfg := testConf()
+	cfg.AcceptBacklog = 8
+	client, server := testClientServerConfig(cfg)
+
+	defer client.Close()
+	defer server.Close()
+
+	for i := 0; i < 8; i++ {
+		s, err := client.OpenStream()
+		if err != nil {
+			t.Fatal(err)
+		}
+		s.Close()
+	}
+
+	for i := 0; i < 8; i++ {
+		s, err := server.AcceptStream()
+		if err != nil {
+			t.Fatal(err)
+		}
+		s.Close()
+	}
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		s, err := client.OpenStream()
+		if err != nil {
+			t.Fatal(err)
+		}
+		s.Close()
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(time.Second * 5):
+		t.Fatal("timed out trying to open stream")
+	}
+}
+
+func TestAccept(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	if client.NumStreams() != 0 {
+		t.Fatalf("bad")
+	}
+	if server.NumStreams() != 0 {
+		t.Fatalf("bad")
+	}
+
+	wg := &sync.WaitGroup{}
+	wg.Add(4)
+
+	go func() {
+		defer wg.Done()
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if id := stream.StreamID(); id != 1 {
+			t.Fatalf("bad: %v", id)
+		}
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	go func() {
+		defer wg.Done()
+		stream, err := client.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if id := stream.StreamID(); id != 2 {
+			t.Fatalf("bad: %v", id)
+		}
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	go func() {
+		defer wg.Done()
+		stream, err := server.OpenStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if id := stream.StreamID(); id != 2 {
+			t.Fatalf("bad: %v", id)
+		}
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	go func() {
+		defer wg.Done()
+		stream, err := client.OpenStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if id := stream.StreamID(); id != 1 {
+			t.Fatalf("bad: %v", id)
+		}
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	doneCh := make(chan struct{})
+	go func() {
+		wg.Wait()
+		close(doneCh)
+	}()
+
+	select {
+	case <-doneCh:
+	case <-time.After(time.Second):
+		panic("timeout")
+	}
+}
+
+func TestNonNilInterface(t *testing.T) {
+	_, server := testClientServer()
+	server.Close()
+
+	conn, err := server.Accept()
+	if err != nil && conn != nil {
+		t.Error("bad: accept should return a connection of nil value")
+	}
+
+	conn, err = server.Open()
+	if err != nil && conn != nil {
+		t.Error("bad: open should return a connection of nil value")
+	}
+}
+
+func TestSendData_Small(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	go func() {
+		defer wg.Done()
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+
+		if server.NumStreams() != 1 {
+			t.Fatalf("bad")
+		}
+
+		buf := make([]byte, 4)
+		for i := 0; i < 1000; i++ {
+			n, err := stream.Read(buf)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != 4 {
+				t.Fatalf("short read: %d", n)
+			}
+			if string(buf) != "test" {
+				t.Fatalf("bad: %s", buf)
+			}
+		}
+
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	go func() {
+		defer wg.Done()
+		stream, err := client.Open()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+
+		if client.NumStreams() != 1 {
+			t.Fatalf("bad")
+		}
+
+		for i := 0; i < 1000; i++ {
+			n, err := stream.Write([]byte("test"))
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != 4 {
+				t.Fatalf("short write %d", n)
+			}
+		}
+
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	doneCh := make(chan struct{})
+	go func() {
+		wg.Wait()
+		close(doneCh)
+	}()
+	select {
+	case <-doneCh:
+	case <-time.After(time.Second):
+		panic("timeout")
+	}
+
+	if client.NumStreams() != 0 {
+		t.Fatalf("bad")
+	}
+	if server.NumStreams() != 0 {
+		t.Fatalf("bad")
+	}
+}
+
+func TestSendData_Large(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	const (
+		sendSize = 250 * 1024 * 1024
+		recvSize = 4 * 1024
+	)
+
+	data := make([]byte, sendSize)
+	for idx := range data {
+		data[idx] = byte(idx % 256)
+	}
+
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	go func() {
+		defer wg.Done()
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		var sz int
+		buf := make([]byte, recvSize)
+		for i := 0; i < sendSize/recvSize; i++ {
+			n, err := stream.Read(buf)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != recvSize {
+				t.Fatalf("short read: %d", n)
+			}
+			sz += n
+			for idx := range buf {
+				if buf[idx] != byte(idx%256) {
+					t.Fatalf("bad: %v %v %v", i, idx, buf[idx])
+				}
+			}
+		}
+
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+
+		t.Logf("cap=%d, n=%d\n", stream.recvBuf.Cap(), sz)
+	}()
+
+	go func() {
+		defer wg.Done()
+		stream, err := client.Open()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+
+		n, err := stream.Write(data)
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if n != len(data) {
+			t.Fatalf("short write %d", n)
+		}
+
+		if err := stream.Close(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	doneCh := make(chan struct{})
+	go func() {
+		wg.Wait()
+		close(doneCh)
+	}()
+	select {
+	case <-doneCh:
+	case <-time.After(5 * time.Second):
+		panic("timeout")
+	}
+}
+
+func TestGoAway(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	if err := server.GoAway(); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	_, err := client.Open()
+	if err != ErrRemoteGoAway {
+		t.Fatalf("err: %v", err)
+	}
+}
+
+func TestManyStreams(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	wg := &sync.WaitGroup{}
+
+	acceptor := func(i int) {
+		defer wg.Done()
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		buf := make([]byte, 512)
+		for {
+			n, err := stream.Read(buf)
+			if err == io.EOF {
+				return
+			}
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n == 0 {
+				t.Fatalf("err: %v", err)
+			}
+		}
+	}
+	sender := func(i int) {
+		defer wg.Done()
+		stream, err := client.Open()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		msg := fmt.Sprintf("%08d", i)
+		for i := 0; i < 1000; i++ {
+			n, err := stream.Write([]byte(msg))
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != len(msg) {
+				t.Fatalf("short write %d", n)
+			}
+		}
+	}
+
+	for i := 0; i < 50; i++ {
+		wg.Add(2)
+		go acceptor(i)
+		go sender(i)
+	}
+
+	wg.Wait()
+}
+
+func TestManyStreams_PingPong(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	wg := &sync.WaitGroup{}
+
+	ping := []byte("ping")
+	pong := []byte("pong")
+
+	acceptor := func(i int) {
+		defer wg.Done()
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		buf := make([]byte, 4)
+		for {
+			// Read the 'ping'
+			n, err := stream.Read(buf)
+			if err == io.EOF {
+				return
+			}
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != 4 {
+				t.Fatalf("err: %v", err)
+			}
+			if !bytes.Equal(buf, ping) {
+				t.Fatalf("bad: %s", buf)
+			}
+
+			// Shrink the internal buffer!
+			stream.Shrink()
+
+			// Write out the 'pong'
+			n, err = stream.Write(pong)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != 4 {
+				t.Fatalf("err: %v", err)
+			}
+		}
+	}
+	sender := func(i int) {
+		defer wg.Done()
+		stream, err := client.OpenStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		buf := make([]byte, 4)
+		for i := 0; i < 1000; i++ {
+			// Send the 'ping'
+			n, err := stream.Write(ping)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != 4 {
+				t.Fatalf("short write %d", n)
+			}
+
+			// Read the 'pong'
+			n, err = stream.Read(buf)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if n != 4 {
+				t.Fatalf("err: %v", err)
+			}
+			if !bytes.Equal(buf, pong) {
+				t.Fatalf("bad: %s", buf)
+			}
+
+			// Shrink the buffer
+			stream.Shrink()
+		}
+	}
+
+	for i := 0; i < 50; i++ {
+		wg.Add(2)
+		go acceptor(i)
+		go sender(i)
+	}
+
+	wg.Wait()
+}
+
+func TestHalfClose(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	stream, err := client.Open()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if _, err = stream.Write([]byte("a")); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	stream2, err := server.Accept()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	stream2.Close() // Half close
+
+	buf := make([]byte, 4)
+	n, err := stream2.Read(buf)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if n != 1 {
+		t.Fatalf("bad: %v", n)
+	}
+
+	// Send more
+	if _, err = stream.Write([]byte("bcd")); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	stream.Close()
+
+	// Read after close
+	n, err = stream2.Read(buf)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if n != 3 {
+		t.Fatalf("bad: %v", n)
+	}
+
+	// EOF after close
+	n, err = stream2.Read(buf)
+	if err != io.EOF {
+		t.Fatalf("err: %v", err)
+	}
+	if n != 0 {
+		t.Fatalf("bad: %v", n)
+	}
+}
+
+func TestReadDeadline(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	stream, err := client.Open()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer stream.Close()
+
+	stream2, err := server.Accept()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer stream2.Close()
+
+	if err := stream.SetReadDeadline(time.Now().Add(5 * time.Millisecond)); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	buf := make([]byte, 4)
+	if _, err := stream.Read(buf); err != ErrTimeout {
+		t.Fatalf("err: %v", err)
+	}
+}
+
+func TestWriteDeadline(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	stream, err := client.Open()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer stream.Close()
+
+	stream2, err := server.Accept()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer stream2.Close()
+
+	if err := stream.SetWriteDeadline(time.Now().Add(50 * time.Millisecond)); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	buf := make([]byte, 512)
+	for i := 0; i < int(initialStreamWindow); i++ {
+		_, err := stream.Write(buf)
+		if err != nil && err == ErrTimeout {
+			return
+		} else if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}
+	t.Fatalf("Expected timeout")
+}
+
+func TestBacklogExceeded(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	// Fill the backlog
+	max := client.config.AcceptBacklog
+	for i := 0; i < max; i++ {
+		stream, err := client.Open()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		if _, err := stream.Write([]byte("foo")); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}
+
+	// Attempt to open a new stream
+	errCh := make(chan error, 1)
+	go func() {
+		_, err := client.Open()
+		errCh <- err
+	}()
+
+	// Shutdown the server
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		server.Close()
+	}()
+
+	select {
+	case err := <-errCh:
+		if err == nil {
+			t.Fatalf("open should fail")
+		}
+	case <-time.After(time.Second):
+		t.Fatalf("timeout")
+	}
+}
+
+func TestKeepAlive(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	time.Sleep(200 * time.Millisecond)
+
+	// Ping value should increase
+	client.pingLock.Lock()
+	defer client.pingLock.Unlock()
+	if client.pingID == 0 {
+		t.Fatalf("should ping")
+	}
+
+	server.pingLock.Lock()
+	defer server.pingLock.Unlock()
+	if server.pingID == 0 {
+		t.Fatalf("should ping")
+	}
+}
+
+func TestKeepAlive_Timeout(t *testing.T) {
+	conn1, conn2 := testConn()
+
+	clientConf := testConf()
+	clientConf.ConnectionWriteTimeout = time.Hour // We're testing keep alives, not connection writes
+	clientConf.EnableKeepAlive = false            // Just test one direction, so it's deterministic who hangs up on whom
+	client, _ := Client(conn1, clientConf)
+	defer client.Close()
+
+	server, _ := Server(conn2, testConf())
+	defer server.Close()
+
+	_ = captureLogs(client) // Client logs aren't part of the test
+	serverLogs := captureLogs(server)
+
+	errCh := make(chan error, 1)
+	go func() {
+		_, err := server.Accept() // Wait until server closes
+		errCh <- err
+	}()
+
+	// Prevent the client from responding
+	clientConn := client.conn.(*pipeConn)
+	clientConn.writeBlocker.Lock()
+
+	select {
+	case err := <-errCh:
+		if err != ErrKeepAliveTimeout {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	case <-time.After(1 * time.Second):
+		t.Fatalf("timeout waiting for timeout")
+	}
+
+	if !server.IsClosed() {
+		t.Fatalf("server should have closed")
+	}
+
+	if !serverLogs.match([]string{"[ERR] yamux: keepalive failed: i/o deadline reached"}) {
+		t.Fatalf("server log incorect: %v", serverLogs.logs())
+	}
+}
+
+func TestLargeWindow(t *testing.T) {
+	conf := DefaultConfig()
+	conf.MaxStreamWindowSize *= 2
+
+	client, server := testClientServerConfig(conf)
+	defer client.Close()
+	defer server.Close()
+
+	stream, err := client.Open()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer stream.Close()
+
+	stream2, err := server.Accept()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer stream2.Close()
+
+	stream.SetWriteDeadline(time.Now().Add(10 * time.Millisecond))
+	buf := make([]byte, conf.MaxStreamWindowSize)
+	n, err := stream.Write(buf)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if n != len(buf) {
+		t.Fatalf("short write: %d", n)
+	}
+}
+
+type UnlimitedReader struct{}
+
+func (u *UnlimitedReader) Read(p []byte) (int, error) {
+	runtime.Gosched()
+	return len(p), nil
+}
+
+func TestSendData_VeryLarge(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	var n int64 = 1 * 1024 * 1024 * 1024
+	var workers int = 16
+
+	wg := &sync.WaitGroup{}
+	wg.Add(workers * 2)
+
+	for i := 0; i < workers; i++ {
+		go func() {
+			defer wg.Done()
+			stream, err := server.AcceptStream()
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			defer stream.Close()
+
+			buf := make([]byte, 4)
+			_, err = stream.Read(buf)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if !bytes.Equal(buf, []byte{0, 1, 2, 3}) {
+				t.Fatalf("bad header")
+			}
+
+			recv, err := io.Copy(ioutil.Discard, stream)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if recv != n {
+				t.Fatalf("bad: %v", recv)
+			}
+		}()
+	}
+	for i := 0; i < workers; i++ {
+		go func() {
+			defer wg.Done()
+			stream, err := client.Open()
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			defer stream.Close()
+
+			_, err = stream.Write([]byte{0, 1, 2, 3})
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+
+			unlimited := &UnlimitedReader{}
+			sent, err := io.Copy(stream, io.LimitReader(unlimited, n))
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			if sent != n {
+				t.Fatalf("bad: %v", sent)
+			}
+		}()
+	}
+
+	doneCh := make(chan struct{})
+	go func() {
+		wg.Wait()
+		close(doneCh)
+	}()
+	select {
+	case <-doneCh:
+	case <-time.After(20 * time.Second):
+		panic("timeout")
+	}
+}
+
+func TestBacklogExceeded_Accept(t *testing.T) {
+	client, server := testClientServer()
+	defer client.Close()
+	defer server.Close()
+
+	max := 5 * client.config.AcceptBacklog
+	go func() {
+		for i := 0; i < max; i++ {
+			stream, err := server.Accept()
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+			defer stream.Close()
+		}
+	}()
+
+	// Fill the backlog
+	for i := 0; i < max; i++ {
+		stream, err := client.Open()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		if _, err := stream.Write([]byte("foo")); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}
+}
+
+func TestSession_WindowUpdateWriteDuringRead(t *testing.T) {
+	client, server := testClientServerConfig(testConfNoKeepAlive())
+	defer client.Close()
+	defer server.Close()
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	// Choose a huge flood size that we know will result in a window update.
+	flood := int64(client.config.MaxStreamWindowSize) - 1
+
+	// The server will accept a new stream and then flood data to it.
+	go func() {
+		defer wg.Done()
+
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		n, err := stream.Write(make([]byte, flood))
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if int64(n) != flood {
+			t.Fatalf("short write: %d", n)
+		}
+	}()
+
+	// The client will open a stream, block outbound writes, and then
+	// listen to the flood from the server, which should time out since
+	// it won't be able to send the window update.
+	go func() {
+		defer wg.Done()
+
+		stream, err := client.OpenStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		conn := client.conn.(*pipeConn)
+		conn.writeBlocker.Lock()
+
+		_, err = stream.Read(make([]byte, flood))
+		if err != ErrConnectionWriteTimeout {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	wg.Wait()
+}
+
+func TestSession_PartialReadWindowUpdate(t *testing.T) {
+	client, server := testClientServerConfig(testConfNoKeepAlive())
+	defer client.Close()
+	defer server.Close()
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	// Choose a huge flood size that we know will result in a window update.
+	flood := int64(client.config.MaxStreamWindowSize)
+	var wr *Stream
+
+	// The server will accept a new stream and then flood data to it.
+	go func() {
+		defer wg.Done()
+
+		var err error
+		wr, err = server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer wr.Close()
+
+		if wr.sendWindow != client.config.MaxStreamWindowSize {
+			t.Fatalf("sendWindow: exp=%d, got=%d", client.config.MaxStreamWindowSize, wr.sendWindow)
+		}
+
+		n, err := wr.Write(make([]byte, flood))
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		if int64(n) != flood {
+			t.Fatalf("short write: %d", n)
+		}
+		if wr.sendWindow != 0 {
+			t.Fatalf("sendWindow: exp=%d, got=%d", 0, wr.sendWindow)
+		}
+	}()
+
+	stream, err := client.OpenStream()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	defer stream.Close()
+
+	wg.Wait()
+
+	_, err = stream.Read(make([]byte, flood/2+1))
+
+	if exp := uint32(flood/2 + 1); wr.sendWindow != exp {
+		t.Errorf("sendWindow: exp=%d, got=%d", exp, wr.sendWindow)
+	}
+}
+
+func TestSession_sendNoWait_Timeout(t *testing.T) {
+	client, server := testClientServerConfig(testConfNoKeepAlive())
+	defer client.Close()
+	defer server.Close()
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	go func() {
+		defer wg.Done()
+
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+	}()
+
+	// The client will open the stream and then block outbound writes, we'll
+	// probe sendNoWait once it gets into that state.
+	go func() {
+		defer wg.Done()
+
+		stream, err := client.OpenStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		conn := client.conn.(*pipeConn)
+		conn.writeBlocker.Lock()
+
+		hdr := header(make([]byte, headerSize))
+		hdr.encode(typePing, flagACK, 0, 0)
+		for {
+			err = client.sendNoWait(hdr)
+			if err == nil {
+				continue
+			} else if err == ErrConnectionWriteTimeout {
+				break
+			} else {
+				t.Fatalf("err: %v", err)
+			}
+		}
+	}()
+
+	wg.Wait()
+}
+
+func TestSession_PingOfDeath(t *testing.T) {
+	client, server := testClientServerConfig(testConfNoKeepAlive())
+	defer client.Close()
+	defer server.Close()
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	var doPingOfDeath sync.Mutex
+	doPingOfDeath.Lock()
+
+	// This is used later to block outbound writes.
+	conn := server.conn.(*pipeConn)
+
+	// The server will accept a stream, block outbound writes, and then
+	// flood its send channel so that no more headers can be queued.
+	go func() {
+		defer wg.Done()
+
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		conn.writeBlocker.Lock()
+		for {
+			hdr := header(make([]byte, headerSize))
+			hdr.encode(typePing, 0, 0, 0)
+			err = server.sendNoWait(hdr)
+			if err == nil {
+				continue
+			} else if err == ErrConnectionWriteTimeout {
+				break
+			} else {
+				t.Fatalf("err: %v", err)
+			}
+		}
+
+		doPingOfDeath.Unlock()
+	}()
+
+	// The client will open a stream and then send the server a ping once it
+	// can no longer write. This makes sure the server doesn't deadlock reads
+	// while trying to reply to the ping with no ability to write.
+	go func() {
+		defer wg.Done()
+
+		stream, err := client.OpenStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		// This ping will never unblock because the ping id will never
+		// show up in a response.
+		doPingOfDeath.Lock()
+		go func() { client.Ping() }()
+
+		// Wait for a while to make sure the previous ping times out,
+		// then turn writes back on and make sure a ping works again.
+		time.Sleep(2 * server.config.ConnectionWriteTimeout)
+		conn.writeBlocker.Unlock()
+		if _, err = client.Ping(); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+
+	wg.Wait()
+}
+
+func TestSession_ConnectionWriteTimeout(t *testing.T) {
+	client, server := testClientServerConfig(testConfNoKeepAlive())
+	defer client.Close()
+	defer server.Close()
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	go func() {
+		defer wg.Done()
+
+		stream, err := server.AcceptStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+	}()
+
+	// The client will open the stream and then block outbound writes, we'll
+	// tee up a write and make sure it eventually times out.
+	go func() {
+		defer wg.Done()
+
+		stream, err := client.OpenStream()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer stream.Close()
+
+		conn := client.conn.(*pipeConn)
+		conn.writeBlocker.Lock()
+
+		// Since the write goroutine is blocked then this will return a
+		// timeout since it can't get feedback about whether the write
+		// worked.
+		n, err := stream.Write([]byte("hello"))
+		if err != ErrConnectionWriteTimeout {
+			t.Fatalf("err: %v", err)
+		}
+		if n != 0 {
+			t.Fatalf("lied about writes: %d", n)
+		}
+	}()
+
+	wg.Wait()
+}

vendor/github.com/hashicorp/yamux/spec.md

@@ -0,0 +1,140 @@
+# Specification
+
+We use this document to detail the internal specification of Yamux.
+This is used both as a guide for implementing Yamux, but also for
+alternative interoperable libraries to be built.
+
+# Framing
+
+Yamux uses a streaming connection underneath, but imposes a message
+framing so that it can be shared between many logical streams. Each
+frame contains a header like:
+
+* Version (8 bits)
+* Type (8 bits)
+* Flags (16 bits)
+* StreamID (32 bits)
+* Length (32 bits)
+
+This means that each header has a 12 byte overhead.
+All fields are encoded in network order (big endian).
+Each field is described below:
+
+## Version Field
+
+The version field is used for future backward compatibility. At the
+current time, the field is always set to 0, to indicate the initial
+version.
+
+## Type Field
+
+The type field is used to switch the frame message type. The following
+message types are supported:
+
+* 0x0 Data - Used to transmit data. May transmit zero length payloads
+  depending on the flags.
+
+* 0x1 Window Update - Used to updated the senders receive window size.
+  This is used to implement per-session flow control.
+
+* 0x2 Ping - Used to measure RTT. It can also be used to heart-beat
+  and do keep-alives over TCP.
+
+* 0x3 Go Away - Used to close a session.
+
+## Flag Field
+
+The flags field is used to provide additional information related
+to the message type. The following flags are supported:
+
+* 0x1 SYN - Signals the start of a new stream. May be sent with a data or
+  window update message. Also sent with a ping to indicate outbound.
+
+* 0x2 ACK - Acknowledges the start of a new stream. May be sent with a data
+  or window update message. Also sent with a ping to indicate response.
+
+* 0x4 FIN - Performs a half-close of a stream. May be sent with a data
+  message or window update.
+
+* 0x8 RST - Reset a stream immediately. May be sent with a data or
+  window update message.
+
+## StreamID Field
+
+The StreamID field is used to identify the logical stream the frame
+is addressing. The client side should use odd ID's, and the server even.
+This prevents any collisions. Additionally, the 0 ID is reserved to represent
+the session.
+
+Both Ping and Go Away messages should always use the 0 StreamID.
+
+## Length Field
+
+The meaning of the length field depends on the message type:
+
+* Data - provides the length of bytes following the header
+* Window update - provides a delta update to the window size
+* Ping - Contains an opaque value, echoed back
+* Go Away - Contains an error code
+
+# Message Flow
+
+There is no explicit connection setup, as Yamux relies on an underlying
+transport to be provided. However, there is a distinction between client
+and server side of the connection.
+
+## Opening a stream
+
+To open a stream, an initial data or window update frame is sent
+with a new StreamID. The SYN flag should be set to signal a new stream.
+
+The receiver must then reply with either a data or window update frame
+with the StreamID along with the ACK flag to accept the stream or with
+the RST flag to reject the stream.
+
+Because we are relying on the reliable stream underneath, a connection
+can begin sending data once the SYN flag is sent. The corresponding
+ACK does not need to be received. This is particularly well suited
+for an RPC system where a client wants to open a stream and immediately
+fire a request without waiting for the RTT of the ACK.
+
+This does introduce the possibility of a connection being rejected
+after data has been sent already. This is a slight semantic difference
+from TCP, where the conection cannot be refused after it is opened.
+Clients should be prepared to handle this by checking for an error
+that indicates a RST was received.
+
+## Closing a stream
+
+To close a stream, either side sends a data or window update frame
+along with the FIN flag. This does a half-close indicating the sender
+will send no further data.
+
+Once both sides have closed the connection, the stream is closed.
+
+Alternatively, if an error occurs, the RST flag can be used to
+hard close a stream immediately.
+
+## Flow Control
+
+When Yamux is initially starts each stream with a 256KB window size.
+There is no window size for the session.
+
+To prevent the streams from stalling, window update frames should be
+sent regularly. Yamux can be configured to provide a larger limit for
+windows sizes. Both sides assume the initial 256KB window, but can
+immediately send a window update as part of the SYN/ACK indicating a
+larger window.
+
+Both sides should track the number of bytes sent in Data frames
+only, as only they are tracked as part of the window size.
+
+## Session termination
+
+When a session is being terminated, the Go Away message should
+be sent. The Length should be set to one of the following to
+provide an error code:
+
+* 0x0 Normal termination
+* 0x1 Protocol error
+* 0x2 Internal error

vendor/github.com/hashicorp/yamux/stream.go

@@ -0,0 +1,470 @@
+package yamux
+
+import (
+	"bytes"
+	"io"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+type streamState int
+
+const (
+	streamInit streamState = iota
+	streamSYNSent
+	streamSYNReceived
+	streamEstablished
+	streamLocalClose
+	streamRemoteClose
+	streamClosed
+	streamReset
+)
+
+// Stream is used to represent a logical stream
+// within a session.
+type Stream struct {
+	recvWindow uint32
+	sendWindow uint32
+
+	id      uint32
+	session *Session
+
+	state     streamState
+	stateLock sync.Mutex
+
+	recvBuf  *bytes.Buffer
+	recvLock sync.Mutex
+
+	controlHdr     header
+	controlErr     chan error
+	controlHdrLock sync.Mutex
+
+	sendHdr  header
+	sendErr  chan error
+	sendLock sync.Mutex
+
+	recvNotifyCh chan struct{}
+	sendNotifyCh chan struct{}
+
+	readDeadline  atomic.Value // time.Time
+	writeDeadline atomic.Value // time.Time
+}
+
+// newStream is used to construct a new stream within
+// a given session for an ID
+func newStream(session *Session, id uint32, state streamState) *Stream {
+	s := &Stream{
+		id:           id,
+		session:      session,
+		state:        state,
+		controlHdr:   header(make([]byte, headerSize)),
+		controlErr:   make(chan error, 1),
+		sendHdr:      header(make([]byte, headerSize)),
+		sendErr:      make(chan error, 1),
+		recvWindow:   initialStreamWindow,
+		sendWindow:   initialStreamWindow,
+		recvNotifyCh: make(chan struct{}, 1),
+		sendNotifyCh: make(chan struct{}, 1),
+	}
+	s.readDeadline.Store(time.Time{})
+	s.writeDeadline.Store(time.Time{})
+	return s
+}
+
+// Session returns the associated stream session
+func (s *Stream) Session() *Session {
+	return s.session
+}
+
+// StreamID returns the ID of this stream
+func (s *Stream) StreamID() uint32 {
+	return s.id
+}
+
+// Read is used to read from the stream
+func (s *Stream) Read(b []byte) (n int, err error) {
+	defer asyncNotify(s.recvNotifyCh)
+START:
+	s.stateLock.Lock()
+	switch s.state {
+	case streamLocalClose:
+		fallthrough
+	case streamRemoteClose:
+		fallthrough
+	case streamClosed:
+		s.recvLock.Lock()
+		if s.recvBuf == nil || s.recvBuf.Len() == 0 {
+			s.recvLock.Unlock()
+			s.stateLock.Unlock()
+			return 0, io.EOF
+		}
+		s.recvLock.Unlock()
+	case streamReset:
+		s.stateLock.Unlock()
+		return 0, ErrConnectionReset
+	}
+	s.stateLock.Unlock()
+
+	// If there is no data available, block
+	s.recvLock.Lock()
+	if s.recvBuf == nil || s.recvBuf.Len() == 0 {
+		s.recvLock.Unlock()
+		goto WAIT
+	}
+
+	// Read any bytes
+	n, _ = s.recvBuf.Read(b)
+	s.recvLock.Unlock()
+
+	// Send a window update potentially
+	err = s.sendWindowUpdate()
+	return n, err
+
+WAIT:
+	var timeout <-chan time.Time
+	var timer *time.Timer
+	readDeadline := s.readDeadline.Load().(time.Time)
+	if !readDeadline.IsZero() {
+		delay := readDeadline.Sub(time.Now())
+		timer = time.NewTimer(delay)
+		timeout = timer.C
+	}
+	select {
+	case <-s.recvNotifyCh:
+		if timer != nil {
+			timer.Stop()
+		}
+		goto START
+	case <-timeout:
+		return 0, ErrTimeout
+	}
+}
+
+// Write is used to write to the stream
+func (s *Stream) Write(b []byte) (n int, err error) {
+	s.sendLock.Lock()
+	defer s.sendLock.Unlock()
+	total := 0
+	for total < len(b) {
+		n, err := s.write(b[total:])
+		total += n
+		if err != nil {
+			return total, err
+		}
+	}
+	return total, nil
+}
+
+// write is used to write to the stream, may return on
+// a short write.
+func (s *Stream) write(b []byte) (n int, err error) {
+	var flags uint16
+	var max uint32
+	var body io.Reader
+START:
+	s.stateLock.Lock()
+	switch s.state {
+	case streamLocalClose:
+		fallthrough
+	case streamClosed:
+		s.stateLock.Unlock()
+		return 0, ErrStreamClosed
+	case streamReset:
+		s.stateLock.Unlock()
+		return 0, ErrConnectionReset
+	}
+	s.stateLock.Unlock()
+
+	// If there is no data available, block
+	window := atomic.LoadUint32(&s.sendWindow)
+	if window == 0 {
+		goto WAIT
+	}
+
+	// Determine the flags if any
+	flags = s.sendFlags()
+
+	// Send up to our send window
+	max = min(window, uint32(len(b)))
+	body = bytes.NewReader(b[:max])
+
+	// Send the header
+	s.sendHdr.encode(typeData, flags, s.id, max)
+	if err = s.session.waitForSendErr(s.sendHdr, body, s.sendErr); err != nil {
+		return 0, err
+	}
+
+	// Reduce our send window
+	atomic.AddUint32(&s.sendWindow, ^uint32(max-1))
+
+	// Unlock
+	return int(max), err
+
+WAIT:
+	var timeout <-chan time.Time
+	writeDeadline := s.writeDeadline.Load().(time.Time)
+	if !writeDeadline.IsZero() {
+		delay := writeDeadline.Sub(time.Now())
+		timeout = time.After(delay)
+	}
+	select {
+	case <-s.sendNotifyCh:
+		goto START
+	case <-timeout:
+		return 0, ErrTimeout
+	}
+	return 0, nil
+}
+
+// sendFlags determines any flags that are appropriate
+// based on the current stream state
+func (s *Stream) sendFlags() uint16 {
+	s.stateLock.Lock()
+	defer s.stateLock.Unlock()
+	var flags uint16
+	switch s.state {
+	case streamInit:
+		flags |= flagSYN
+		s.state = streamSYNSent
+	case streamSYNReceived:
+		flags |= flagACK
+		s.state = streamEstablished
+	}
+	return flags
+}
+
+// sendWindowUpdate potentially sends a window update enabling
+// further writes to take place. Must be invoked with the lock.
+func (s *Stream) sendWindowUpdate() error {
+	s.controlHdrLock.Lock()
+	defer s.controlHdrLock.Unlock()
+
+	// Determine the delta update
+	max := s.session.config.MaxStreamWindowSize
+	var bufLen uint32
+	s.recvLock.Lock()
+	if s.recvBuf != nil {
+		bufLen = uint32(s.recvBuf.Len())
+	}
+	delta := (max - bufLen) - s.recvWindow
+
+	// Determine the flags if any
+	flags := s.sendFlags()
+
+	// Check if we can omit the update
+	if delta < (max/2) && flags == 0 {
+		s.recvLock.Unlock()
+		return nil
+	}
+
+	// Update our window
+	s.recvWindow += delta
+	s.recvLock.Unlock()
+
+	// Send the header
+	s.controlHdr.encode(typeWindowUpdate, flags, s.id, delta)
+	if err := s.session.waitForSendErr(s.controlHdr, nil, s.controlErr); err != nil {
+		return err
+	}
+	return nil
+}
+
+// sendClose is used to send a FIN
+func (s *Stream) sendClose() error {
+	s.controlHdrLock.Lock()
+	defer s.controlHdrLock.Unlock()
+
+	flags := s.sendFlags()
+	flags |= flagFIN
+	s.controlHdr.encode(typeWindowUpdate, flags, s.id, 0)
+	if err := s.session.waitForSendErr(s.controlHdr, nil, s.controlErr); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Close is used to close the stream
+func (s *Stream) Close() error {
+	closeStream := false
+	s.stateLock.Lock()
+	switch s.state {
+	// Opened means we need to signal a close
+	case streamSYNSent:
+		fallthrough
+	case streamSYNReceived:
+		fallthrough
+	case streamEstablished:
+		s.state = streamLocalClose
+		goto SEND_CLOSE
+
+	case streamLocalClose:
+	case streamRemoteClose:
+		s.state = streamClosed
+		closeStream = true
+		goto SEND_CLOSE
+
+	case streamClosed:
+	case streamReset:
+	default:
+		panic("unhandled state")
+	}
+	s.stateLock.Unlock()
+	return nil
+SEND_CLOSE:
+	s.stateLock.Unlock()
+	s.sendClose()
+	s.notifyWaiting()
+	if closeStream {
+		s.session.closeStream(s.id)
+	}
+	return nil
+}
+
+// forceClose is used for when the session is exiting
+func (s *Stream) forceClose() {
+	s.stateLock.Lock()
+	s.state = streamClosed
+	s.stateLock.Unlock()
+	s.notifyWaiting()
+}
+
+// processFlags is used to update the state of the stream
+// based on set flags, if any. Lock must be held
+func (s *Stream) processFlags(flags uint16) error {
+	// Close the stream without holding the state lock
+	closeStream := false
+	defer func() {
+		if closeStream {
+			s.session.closeStream(s.id)
+		}
+	}()
+
+	s.stateLock.Lock()
+	defer s.stateLock.Unlock()
+	if flags&flagACK == flagACK {
+		if s.state == streamSYNSent {
+			s.state = streamEstablished
+		}
+		s.session.establishStream(s.id)
+	}
+	if flags&flagFIN == flagFIN {
+		switch s.state {
+		case streamSYNSent:
+			fallthrough
+		case streamSYNReceived:
+			fallthrough
+		case streamEstablished:
+			s.state = streamRemoteClose
+			s.notifyWaiting()
+		case streamLocalClose:
+			s.state = streamClosed
+			closeStream = true
+			s.notifyWaiting()
+		default:
+			s.session.logger.Printf("[ERR] yamux: unexpected FIN flag in state %d", s.state)
+			return ErrUnexpectedFlag
+		}
+	}
+	if flags&flagRST == flagRST {
+		s.state = streamReset
+		closeStream = true
+		s.notifyWaiting()
+	}
+	return nil
+}
+
+// notifyWaiting notifies all the waiting channels
+func (s *Stream) notifyWaiting() {
+	asyncNotify(s.recvNotifyCh)
+	asyncNotify(s.sendNotifyCh)
+}
+
+// incrSendWindow updates the size of our send window
+func (s *Stream) incrSendWindow(hdr header, flags uint16) error {
+	if err := s.processFlags(flags); err != nil {
+		return err
+	}
+
+	// Increase window, unblock a sender
+	atomic.AddUint32(&s.sendWindow, hdr.Length())
+	asyncNotify(s.sendNotifyCh)
+	return nil
+}
+
+// readData is used to handle a data frame
+func (s *Stream) readData(hdr header, flags uint16, conn io.Reader) error {
+	if err := s.processFlags(flags); err != nil {
+		return err
+	}
+
+	// Check that our recv window is not exceeded
+	length := hdr.Length()
+	if length == 0 {
+		return nil
+	}
+
+	// Wrap in a limited reader
+	conn = &io.LimitedReader{R: conn, N: int64(length)}
+
+	// Copy into buffer
+	s.recvLock.Lock()
+
+	if length > s.recvWindow {
+		s.session.logger.Printf("[ERR] yamux: receive window exceeded (stream: %d, remain: %d, recv: %d)", s.id, s.recvWindow, length)
+		return ErrRecvWindowExceeded
+	}
+
+	if s.recvBuf == nil {
+		// Allocate the receive buffer just-in-time to fit the full data frame.
+		// This way we can read in the whole packet without further allocations.
+		s.recvBuf = bytes.NewBuffer(make([]byte, 0, length))
+	}
+	if _, err := io.Copy(s.recvBuf, conn); err != nil {
+		s.session.logger.Printf("[ERR] yamux: Failed to read stream data: %v", err)
+		s.recvLock.Unlock()
+		return err
+	}
+
+	// Decrement the receive window
+	s.recvWindow -= length
+	s.recvLock.Unlock()
+
+	// Unblock any readers
+	asyncNotify(s.recvNotifyCh)
+	return nil
+}
+
+// SetDeadline sets the read and write deadlines
+func (s *Stream) SetDeadline(t time.Time) error {
+	if err := s.SetReadDeadline(t); err != nil {
+		return err
+	}
+	if err := s.SetWriteDeadline(t); err != nil {
+		return err
+	}
+	return nil
+}
+
+// SetReadDeadline sets the deadline for future Read calls.
+func (s *Stream) SetReadDeadline(t time.Time) error {
+	s.readDeadline.Store(t)
+	return nil
+}
+
+// SetWriteDeadline sets the deadline for future Write calls
+func (s *Stream) SetWriteDeadline(t time.Time) error {
+	s.writeDeadline.Store(t)
+	return nil
+}
+
+// Shrink is used to compact the amount of buffers utilized
+// This is useful when using Yamux in a connection pool to reduce
+// the idle memory utilization.
+func (s *Stream) Shrink() {
+	s.recvLock.Lock()
+	if s.recvBuf != nil && s.recvBuf.Len() == 0 {
+		s.recvBuf = nil
+	}
+	s.recvLock.Unlock()
+}

vendor/github.com/hashicorp/yamux/util.go

@@ -0,0 +1,43 @@
+package yamux
+
+import (
+	"sync"
+	"time"
+)
+
+var (
+	timerPool = &sync.Pool{
+		New: func() interface{} {
+			timer := time.NewTimer(time.Hour * 1e6)
+			timer.Stop()
+			return timer
+		},
+	}
+)
+
+// asyncSendErr is used to try an async send of an error
+func asyncSendErr(ch chan error, err error) {
+	if ch == nil {
+		return
+	}
+	select {
+	case ch <- err:
+	default:
+	}
+}
+
+// asyncNotify is used to signal a waiting goroutine
+func asyncNotify(ch chan struct{}) {
+	select {
+	case ch <- struct{}{}:
+	default:
+	}
+}
+
+// min computes the minimum of two values
+func min(a, b uint32) uint32 {
+	if a < b {
+		return a
+	}
+	return b
+}

vendor/github.com/hashicorp/yamux/util_test.go

@@ -0,0 +1,50 @@
+package yamux
+
+import (
+	"testing"
+)
+
+func TestAsyncSendErr(t *testing.T) {
+	ch := make(chan error)
+	asyncSendErr(ch, ErrTimeout)
+	select {
+	case <-ch:
+		t.Fatalf("should not get")
+	default:
+	}
+
+	ch = make(chan error, 1)
+	asyncSendErr(ch, ErrTimeout)
+	select {
+	case <-ch:
+	default:
+		t.Fatalf("should get")
+	}
+}
+
+func TestAsyncNotify(t *testing.T) {
+	ch := make(chan struct{})
+	asyncNotify(ch)
+	select {
+	case <-ch:
+		t.Fatalf("should not get")
+	default:
+	}
+
+	ch = make(chan struct{}, 1)
+	asyncNotify(ch)
+	select {
+	case <-ch:
+	default:
+		t.Fatalf("should get")
+	}
+}
+
+func TestMin(t *testing.T) {
+	if min(1, 2) != 1 {
+		t.Fatalf("bad")
+	}
+	if min(2, 1) != 1 {
+		t.Fatalf("bad")
+	}
+}

vendor/github.com/spf13/cobra/cobra/cmd/init.go

@@ -65,7 +65,7 @@ Init will not use an existing directory with contents.`,
 		initializeProject(project)
 
 		fmt.Fprintln(cmd.OutOrStdout(), `Your Cobra application is ready at
-`+project.AbsPath()+`
+`+project.AbsPath()+`.
 
 Give it a try by going there and running `+"`go run main.go`."+`
 Add commands to it by running `+"`cobra add [cmdname]`.")

vendor/github.com/spf13/cobra/command.go

@@ -27,9 +27,6 @@ import (
 	flag "github.com/spf13/pflag"
 )
 
-// FParseErrWhitelist configures Flag parse errors to be ignored
-type FParseErrWhitelist flag.ParseErrorsWhitelist
-
 // Command is just that, a command for your application.
 // E.g.  'go run ...' - 'run' is the command. Cobra requires
 // you to define the usage and description as part of your command
@@ -140,9 +137,6 @@ type Command struct {
 	// TraverseChildren parses flags on all parents before executing child command.
 	TraverseChildren bool
 
-	//FParseErrWhitelist flag parse errors to be ignored
-	FParseErrWhitelist FParseErrWhitelist
-
 	// commands is the list of commands supported by this program.
 	commands []*Command
 	// parent is a parent command for this command.
@@ -1469,10 +1463,6 @@ func (c *Command) ParseFlags(args []string) error {
 	}
 	beforeErrorBufLen := c.flagErrorBuf.Len()
 	c.mergePersistentFlags()
-
-	//do it here after merging all flags and just before parse
-	c.Flags().ParseErrorsWhitelist = flag.ParseErrorsWhitelist(c.FParseErrWhitelist)
-
 	err := c.Flags().Parse(args)
 	// Print warnings if they occurred (e.g. deprecated flag messages).
 	if c.flagErrorBuf.Len()-beforeErrorBufLen > 0 && err == nil {

vendor/github.com/spf13/cobra/command_test.go

@@ -1626,108 +1626,3 @@ func TestCalledAs(t *testing.T) {
 		t.Run(name, tc.test)
 	}
 }
-
-func TestFParseErrWhitelistBackwardCompatibility(t *testing.T) {
-	c := &Command{Use: "c", Run: emptyRun}
-	c.Flags().BoolP("boola", "a", false, "a boolean flag")
-
-	output, err := executeCommand(c, "c", "-a", "--unknown", "flag")
-	if err == nil {
-		t.Error("expected unknown flag error")
-	}
-	checkStringContains(t, output, "unknown flag: --unknown")
-}
-
-func TestFParseErrWhitelistSameCommand(t *testing.T) {
-	c := &Command{
-		Use: "c",
-		Run: emptyRun,
-		FParseErrWhitelist: FParseErrWhitelist{
-			UnknownFlags: true,
-		},
-	}
-	c.Flags().BoolP("boola", "a", false, "a boolean flag")
-
-	_, err := executeCommand(c, "c", "-a", "--unknown", "flag")
-	if err != nil {
-		t.Error("unexpected error: ", err)
-	}
-}
-
-func TestFParseErrWhitelistParentCommand(t *testing.T) {
-	root := &Command{
-		Use: "root",
-		Run: emptyRun,
-		FParseErrWhitelist: FParseErrWhitelist{
-			UnknownFlags: true,
-		},
-	}
-
-	c := &Command{
-		Use: "child",
-		Run: emptyRun,
-	}
-	c.Flags().BoolP("boola", "a", false, "a boolean flag")
-
-	root.AddCommand(c)
-
-	output, err := executeCommand(root, "child", "-a", "--unknown", "flag")
-	if err == nil {
-		t.Error("expected unknown flag error")
-	}
-	checkStringContains(t, output, "unknown flag: --unknown")
-}
-
-func TestFParseErrWhitelistChildCommand(t *testing.T) {
-	root := &Command{
-		Use: "root",
-		Run: emptyRun,
-	}
-
-	c := &Command{
-		Use: "child",
-		Run: emptyRun,
-		FParseErrWhitelist: FParseErrWhitelist{
-			UnknownFlags: true,
-		},
-	}
-	c.Flags().BoolP("boola", "a", false, "a boolean flag")
-
-	root.AddCommand(c)
-
-	_, err := executeCommand(root, "child", "-a", "--unknown", "flag")
-	if err != nil {
-		t.Error("unexpected error: ", err.Error())
-	}
-}
-
-func TestFParseErrWhitelistSiblingCommand(t *testing.T) {
-	root := &Command{
-		Use: "root",
-		Run: emptyRun,
-	}
-
-	c := &Command{
-		Use: "child",
-		Run: emptyRun,
-		FParseErrWhitelist: FParseErrWhitelist{
-			UnknownFlags: true,
-		},
-	}
-	c.Flags().BoolP("boola", "a", false, "a boolean flag")
-
-	s := &Command{
-		Use: "sibling",
-		Run: emptyRun,
-	}
-	s.Flags().BoolP("boolb", "b", false, "a boolean flag")
-
-	root.AddCommand(c)
-	root.AddCommand(s)
-
-	output, err := executeCommand(root, "sibling", "-b", "--unknown", "flag")
-	if err == nil {
-		t.Error("expected unknown flag error")
-	}
-	checkStringContains(t, output, "unknown flag: --unknown")
-}

vendor/github.com/xtaci/smux/.travis.yml

@@ -1,15 +0,0 @@
-language: go
-go:
-    - tip
-
-before_install:
-    - go get -t -v ./...
-
-install:
-    - go get github.com/xtaci/smux
-
-script:
-    - go test -coverprofile=coverage.txt -covermode=atomic -bench .
-
-after_success:
-    - bash <(curl -s https://codecov.io/bash)

vendor/github.com/xtaci/smux/LICENSE

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2016-2017 Daniel Fu
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

vendor/github.com/xtaci/smux/README.md

@@ -1,99 +0,0 @@
-<img src="smux.png" alt="smux" height="35px" />
-
-[![GoDoc][1]][2] [![MIT licensed][3]][4] [![Build Status][5]][6] [![Go Report Card][7]][8] [![Coverage Statusd][9]][10]
-
-<img src="mux.jpg" alt="smux" height="120px" /> 
-
-[1]: https://godoc.org/github.com/xtaci/smux?status.svg
-[2]: https://godoc.org/github.com/xtaci/smux
-[3]: https://img.shields.io/badge/license-MIT-blue.svg
-[4]: LICENSE
-[5]: https://travis-ci.org/xtaci/smux.svg?branch=master
-[6]: https://travis-ci.org/xtaci/smux
-[7]: https://goreportcard.com/badge/github.com/xtaci/smux
-[8]: https://goreportcard.com/report/github.com/xtaci/smux
-[9]: https://codecov.io/gh/xtaci/smux/branch/master/graph/badge.svg
-[10]: https://codecov.io/gh/xtaci/smux
-
-## Introduction
-
-Smux ( **S**imple **MU**ltiple**X**ing) is a multiplexing library for Golang. It relies on an underlying connection to provide reliability and ordering, such as TCP or [KCP](https://github.com/xtaci/kcp-go), and provides stream-oriented multiplexing. The original intention of this library is to power the connection management for [kcp-go](https://github.com/xtaci/kcp-go).
-
-## Features
-
-1. Tiny, less than 600 LOC.
-2. ***Token bucket*** controlled receiving, which provides smoother bandwidth graph(see picture below).
-3. Session-wide receive buffer, shared among streams, tightly controlled overall memory usage.
-4. Minimized header(8Bytes), maximized payload. 
-5. Well-tested on millions of devices in [kcptun](https://github.com/xtaci/kcptun).
-
-![smooth bandwidth curve](curve.jpg)
-
-## Documentation
-
-For complete documentation, see the associated [Godoc](https://godoc.org/github.com/xtaci/smux).
-
-## Specification
-
-```
-VERSION(1B) | CMD(1B) | LENGTH(2B) | STREAMID(4B) | DATA(LENGTH)  
-```
-
-## Usage
-
-The API of smux are mostly taken from [yamux](https://github.com/hashicorp/yamux)
-
-```go
-
-func client() {
-    // Get a TCP connection
-    conn, err := net.Dial(...)
-    if err != nil {
-        panic(err)
-    }
-
-    // Setup client side of smux
-    session, err := smux.Client(conn, nil)
-    if err != nil {
-        panic(err)
-    }
-
-    // Open a new stream
-    stream, err := session.OpenStream()
-    if err != nil {
-        panic(err)
-    }
-
-    // Stream implements io.ReadWriteCloser
-    stream.Write([]byte("ping"))
-}
-
-func server() {
-    // Accept a TCP connection
-    conn, err := listener.Accept()
-    if err != nil {
-        panic(err)
-    }
-
-    // Setup server side of smux
-    session, err := smux.Server(conn, nil)
-    if err != nil {
-        panic(err)
-    }
-
-    // Accept a stream
-    stream, err := session.AcceptStream()
-    if err != nil {
-        panic(err)
-    }
-
-    // Listen for a message
-    buf := make([]byte, 4)
-    stream.Read(buf)
-}
-
-```
-
-## Status
-
-Stable

vendor/github.com/xtaci/smux/frame.go

@@ -1,60 +0,0 @@
-package smux
-
-import (
-	"encoding/binary"
-	"fmt"
-)
-
-const (
-	version = 1
-)
-
-const ( // cmds
-	cmdSYN byte = iota // stream open
-	cmdFIN             // stream close, a.k.a EOF mark
-	cmdPSH             // data push
-	cmdNOP             // no operation
-)
-
-const (
-	sizeOfVer    = 1
-	sizeOfCmd    = 1
-	sizeOfLength = 2
-	sizeOfSid    = 4
-	headerSize   = sizeOfVer + sizeOfCmd + sizeOfSid + sizeOfLength
-)
-
-// Frame defines a packet from or to be multiplexed into a single connection
-type Frame struct {
-	ver  byte
-	cmd  byte
-	sid  uint32
-	data []byte
-}
-
-func newFrame(cmd byte, sid uint32) Frame {
-	return Frame{ver: version, cmd: cmd, sid: sid}
-}
-
-type rawHeader []byte
-
-func (h rawHeader) Version() byte {
-	return h[0]
-}
-
-func (h rawHeader) Cmd() byte {
-	return h[1]
-}
-
-func (h rawHeader) Length() uint16 {
-	return binary.LittleEndian.Uint16(h[2:])
-}
-
-func (h rawHeader) StreamID() uint32 {
-	return binary.LittleEndian.Uint32(h[4:])
-}
-
-func (h rawHeader) String() string {
-	return fmt.Sprintf("Version:%d Cmd:%d StreamID:%d Length:%d",
-		h.Version(), h.Cmd(), h.StreamID(), h.Length())
-}

vendor/github.com/xtaci/smux/mux.go

@@ -1,80 +0,0 @@
-package smux
-
-import (
-	"fmt"
-	"io"
-	"time"
-
-	"github.com/pkg/errors"
-)
-
-// Config is used to tune the Smux session
-type Config struct {
-	// KeepAliveInterval is how often to send a NOP command to the remote
-	KeepAliveInterval time.Duration
-
-	// KeepAliveTimeout is how long the session
-	// will be closed if no data has arrived
-	KeepAliveTimeout time.Duration
-
-	// MaxFrameSize is used to control the maximum
-	// frame size to sent to the remote
-	MaxFrameSize int
-
-	// MaxReceiveBuffer is used to control the maximum
-	// number of data in the buffer pool
-	MaxReceiveBuffer int
-}
-
-// DefaultConfig is used to return a default configuration
-func DefaultConfig() *Config {
-	return &Config{
-		KeepAliveInterval: 10 * time.Second,
-		KeepAliveTimeout:  30 * time.Second,
-		MaxFrameSize:      4096,
-		MaxReceiveBuffer:  4194304,
-	}
-}
-
-// VerifyConfig is used to verify the sanity of configuration
-func VerifyConfig(config *Config) error {
-	if config.KeepAliveInterval == 0 {
-		return errors.New("keep-alive interval must be positive")
-	}
-	if config.KeepAliveTimeout < config.KeepAliveInterval {
-		return fmt.Errorf("keep-alive timeout must be larger than keep-alive interval")
-	}
-	if config.MaxFrameSize <= 0 {
-		return errors.New("max frame size must be positive")
-	}
-	if config.MaxFrameSize > 65535 {
-		return errors.New("max frame size must not be larger than 65535")
-	}
-	if config.MaxReceiveBuffer <= 0 {
-		return errors.New("max receive buffer must be positive")
-	}
-	return nil
-}
-
-// Server is used to initialize a new server-side connection.
-func Server(conn io.ReadWriteCloser, config *Config) (*Session, error) {
-	if config == nil {
-		config = DefaultConfig()
-	}
-	if err := VerifyConfig(config); err != nil {
-		return nil, err
-	}
-	return newSession(config, conn, false), nil
-}
-
-// Client is used to initialize a new client-side connection.
-func Client(conn io.ReadWriteCloser, config *Config) (*Session, error) {
-	if config == nil {
-		config = DefaultConfig()
-	}
-
-	if err := VerifyConfig(config); err != nil {
-		return nil, err
-	}
-	return newSession(config, conn, true), nil
-}

vendor/github.com/xtaci/smux/mux_test.go

@@ -1,69 +0,0 @@
-package smux
-
-import (
-	"bytes"
-	"testing"
-)
-
-type buffer struct {
-	bytes.Buffer
-}
-
-func (b *buffer) Close() error {
-	b.Buffer.Reset()
-	return nil
-}
-
-func TestConfig(t *testing.T) {
-	VerifyConfig(DefaultConfig())
-
-	config := DefaultConfig()
-	config.KeepAliveInterval = 0
-	err := VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.KeepAliveInterval = 10
-	config.KeepAliveTimeout = 5
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxFrameSize = 0
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxFrameSize = 65536
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	config = DefaultConfig()
-	config.MaxReceiveBuffer = 0
-	err = VerifyConfig(config)
-	t.Log(err)
-	if err == nil {
-		t.Fatal(err)
-	}
-
-	var bts buffer
-	if _, err := Server(&bts, config); err == nil {
-		t.Fatal("server started with wrong config")
-	}
-
-	if _, err := Client(&bts, config); err == nil {
-		t.Fatal("client started with wrong config")
-	}
-}

vendor/github.com/xtaci/smux/session.go

@@ -1,353 +0,0 @@
-package smux
-
-import (
-	"encoding/binary"
-	"io"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/pkg/errors"
-)
-
-const (
-	defaultAcceptBacklog = 1024
-)
-
-const (
-	errBrokenPipe      = "broken pipe"
-	errInvalidProtocol = "invalid protocol version"
-	errGoAway          = "stream id overflows, should start a new connection"
-)
-
-type writeRequest struct {
-	frame  Frame
-	result chan writeResult
-}
-
-type writeResult struct {
-	n   int
-	err error
-}
-
-// Session defines a multiplexed connection for streams
-type Session struct {
-	conn io.ReadWriteCloser
-
-	config           *Config
-	nextStreamID     uint32 // next stream identifier
-	nextStreamIDLock sync.Mutex
-
-	bucket       int32         // token bucket
-	bucketNotify chan struct{} // used for waiting for tokens
-
-	streams    map[uint32]*Stream // all streams in this session
-	streamLock sync.Mutex         // locks streams
-
-	die       chan struct{} // flag session has died
-	dieLock   sync.Mutex
-	chAccepts chan *Stream
-
-	dataReady int32 // flag data has arrived
-
-	goAway int32 // flag id exhausted
-
-	deadline atomic.Value
-
-	writes chan writeRequest
-}
-
-func newSession(config *Config, conn io.ReadWriteCloser, client bool) *Session {
-	s := new(Session)
-	s.die = make(chan struct{})
-	s.conn = conn
-	s.config = config
-	s.streams = make(map[uint32]*Stream)
-	s.chAccepts = make(chan *Stream, defaultAcceptBacklog)
-	s.bucket = int32(config.MaxReceiveBuffer)
-	s.bucketNotify = make(chan struct{}, 1)
-	s.writes = make(chan writeRequest)
-
-	if client {
-		s.nextStreamID = 1
-	} else {
-		s.nextStreamID = 0
-	}
-	go s.recvLoop()
-	go s.sendLoop()
-	go s.keepalive()
-	return s
-}
-
-// OpenStream is used to create a new stream
-func (s *Session) OpenStream() (*Stream, error) {
-	if s.IsClosed() {
-		return nil, errors.New(errBrokenPipe)
-	}
-
-	// generate stream id
-	s.nextStreamIDLock.Lock()
-	if s.goAway > 0 {
-		s.nextStreamIDLock.Unlock()
-		return nil, errors.New(errGoAway)
-	}
-
-	s.nextStreamID += 2
-	sid := s.nextStreamID
-	if sid == sid%2 { // stream-id overflows
-		s.goAway = 1
-		s.nextStreamIDLock.Unlock()
-		return nil, errors.New(errGoAway)
-	}
-	s.nextStreamIDLock.Unlock()
-
-	stream := newStream(sid, s.config.MaxFrameSize, s)
-
-	if _, err := s.writeFrame(newFrame(cmdSYN, sid)); err != nil {
-		return nil, errors.Wrap(err, "writeFrame")
-	}
-
-	s.streamLock.Lock()
-	s.streams[sid] = stream
-	s.streamLock.Unlock()
-	return stream, nil
-}
-
-// AcceptStream is used to block until the next available stream
-// is ready to be accepted.
-func (s *Session) AcceptStream() (*Stream, error) {
-	var deadline <-chan time.Time
-	if d, ok := s.deadline.Load().(time.Time); ok && !d.IsZero() {
-		timer := time.NewTimer(d.Sub(time.Now()))
-		defer timer.Stop()
-		deadline = timer.C
-	}
-	select {
-	case stream := <-s.chAccepts:
-		return stream, nil
-	case <-deadline:
-		return nil, errTimeout
-	case <-s.die:
-		return nil, errors.New(errBrokenPipe)
-	}
-}
-
-// Close is used to close the session and all streams.
-func (s *Session) Close() (err error) {
-	s.dieLock.Lock()
-
-	select {
-	case <-s.die:
-		s.dieLock.Unlock()
-		return errors.New(errBrokenPipe)
-	default:
-		close(s.die)
-		s.dieLock.Unlock()
-		s.streamLock.Lock()
-		for k := range s.streams {
-			s.streams[k].sessionClose()
-		}
-		s.streamLock.Unlock()
-		s.notifyBucket()
-		return s.conn.Close()
-	}
-}
-
-// notifyBucket notifies recvLoop that bucket is available
-func (s *Session) notifyBucket() {
-	select {
-	case s.bucketNotify <- struct{}{}:
-	default:
-	}
-}
-
-// IsClosed does a safe check to see if we have shutdown
-func (s *Session) IsClosed() bool {
-	select {
-	case <-s.die:
-		return true
-	default:
-		return false
-	}
-}
-
-// NumStreams returns the number of currently open streams
-func (s *Session) NumStreams() int {
-	if s.IsClosed() {
-		return 0
-	}
-	s.streamLock.Lock()
-	defer s.streamLock.Unlock()
-	return len(s.streams)
-}
-
-// SetDeadline sets a deadline used by Accept* calls.
-// A zero time value disables the deadline.
-func (s *Session) SetDeadline(t time.Time) error {
-	s.deadline.Store(t)
-	return nil
-}
-
-// notify the session that a stream has closed
-func (s *Session) streamClosed(sid uint32) {
-	s.streamLock.Lock()
-	if n := s.streams[sid].recycleTokens(); n > 0 { // return remaining tokens to the bucket
-		if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
-			s.notifyBucket()
-		}
-	}
-	delete(s.streams, sid)
-	s.streamLock.Unlock()
-}
-
-// returnTokens is called by stream to return token after read
-func (s *Session) returnTokens(n int) {
-	if atomic.AddInt32(&s.bucket, int32(n)) > 0 {
-		s.notifyBucket()
-	}
-}
-
-// session read a frame from underlying connection
-// it's data is pointed to the input buffer
-func (s *Session) readFrame(buffer []byte) (f Frame, err error) {
-	if _, err := io.ReadFull(s.conn, buffer[:headerSize]); err != nil {
-		return f, errors.Wrap(err, "readFrame")
-	}
-
-	dec := rawHeader(buffer)
-	if dec.Version() != version {
-		return f, errors.New(errInvalidProtocol)
-	}
-
-	f.ver = dec.Version()
-	f.cmd = dec.Cmd()
-	f.sid = dec.StreamID()
-	if length := dec.Length(); length > 0 {
-		if _, err := io.ReadFull(s.conn, buffer[headerSize:headerSize+length]); err != nil {
-			return f, errors.Wrap(err, "readFrame")
-		}
-		f.data = buffer[headerSize : headerSize+length]
-	}
-	return f, nil
-}
-
-// recvLoop keeps on reading from underlying connection if tokens are available
-func (s *Session) recvLoop() {
-	buffer := make([]byte, (1<<16)+headerSize)
-	for {
-		for atomic.LoadInt32(&s.bucket) <= 0 && !s.IsClosed() {
-			<-s.bucketNotify
-		}
-
-		if f, err := s.readFrame(buffer); err == nil {
-			atomic.StoreInt32(&s.dataReady, 1)
-
-			switch f.cmd {
-			case cmdNOP:
-			case cmdSYN:
-				s.streamLock.Lock()
-				if _, ok := s.streams[f.sid]; !ok {
-					stream := newStream(f.sid, s.config.MaxFrameSize, s)
-					s.streams[f.sid] = stream
-					select {
-					case s.chAccepts <- stream:
-					case <-s.die:
-					}
-				}
-				s.streamLock.Unlock()
-			case cmdFIN:
-				s.streamLock.Lock()
-				if stream, ok := s.streams[f.sid]; ok {
-					stream.markRST()
-					stream.notifyReadEvent()
-				}
-				s.streamLock.Unlock()
-			case cmdPSH:
-				s.streamLock.Lock()
-				if stream, ok := s.streams[f.sid]; ok {
-					atomic.AddInt32(&s.bucket, -int32(len(f.data)))
-					stream.pushBytes(f.data)
-					stream.notifyReadEvent()
-				}
-				s.streamLock.Unlock()
-			default:
-				s.Close()
-				return
-			}
-		} else {
-			s.Close()
-			return
-		}
-	}
-}
-
-func (s *Session) keepalive() {
-	tickerPing := time.NewTicker(s.config.KeepAliveInterval)
-	tickerTimeout := time.NewTicker(s.config.KeepAliveTimeout)
-	defer tickerPing.Stop()
-	defer tickerTimeout.Stop()
-	for {
-		select {
-		case <-tickerPing.C:
-			s.writeFrame(newFrame(cmdNOP, 0))
-			s.notifyBucket() // force a signal to the recvLoop
-		case <-tickerTimeout.C:
-			if !atomic.CompareAndSwapInt32(&s.dataReady, 1, 0) {
-				s.Close()
-				return
-			}
-		case <-s.die:
-			return
-		}
-	}
-}
-
-func (s *Session) sendLoop() {
-	buf := make([]byte, (1<<16)+headerSize)
-	for {
-		select {
-		case <-s.die:
-			return
-		case request, ok := <-s.writes:
-			if !ok {
-				continue
-			}
-			buf[0] = request.frame.ver
-			buf[1] = request.frame.cmd
-			binary.LittleEndian.PutUint16(buf[2:], uint16(len(request.frame.data)))
-			binary.LittleEndian.PutUint32(buf[4:], request.frame.sid)
-			copy(buf[headerSize:], request.frame.data)
-			n, err := s.conn.Write(buf[:headerSize+len(request.frame.data)])
-
-			n -= headerSize
-			if n < 0 {
-				n = 0
-			}
-
-			result := writeResult{
-				n:   n,
-				err: err,
-			}
-
-			request.result <- result
-			close(request.result)
-		}
-	}
-}
-
-// writeFrame writes the frame to the underlying connection
-// and returns the number of bytes written if successful
-func (s *Session) writeFrame(f Frame) (n int, err error) {
-	req := writeRequest{
-		frame:  f,
-		result: make(chan writeResult, 1),
-	}
-	select {
-	case <-s.die:
-		return 0, errors.New(errBrokenPipe)
-	case s.writes <- req:
-	}
-
-	result := <-req.result
-	return result.n, result.err
-}

vendor/github.com/xtaci/smux/session_test.go

@@ -1,667 +0,0 @@
-package smux
-
-import (
-	crand "crypto/rand"
-	"encoding/binary"
-	"fmt"
-	"io"
-	"log"
-	"math/rand"
-	"net"
-	"net/http"
-	_ "net/http/pprof"
-	"strings"
-	"sync"
-	"testing"
-	"time"
-)
-
-func init() {
-	go func() {
-		log.Println(http.ListenAndServe("localhost:6060", nil))
-	}()
-	log.SetFlags(log.LstdFlags | log.Lshortfile)
-	ln, err := net.Listen("tcp", "127.0.0.1:19999")
-	if err != nil {
-		// handle error
-		panic(err)
-	}
-	go func() {
-		for {
-			conn, err := ln.Accept()
-			if err != nil {
-				// handle error
-			}
-			go handleConnection(conn)
-		}
-	}()
-}
-
-func handleConnection(conn net.Conn) {
-	session, _ := Server(conn, nil)
-	for {
-		if stream, err := session.AcceptStream(); err == nil {
-			go func(s io.ReadWriteCloser) {
-				buf := make([]byte, 65536)
-				for {
-					n, err := s.Read(buf)
-					if err != nil {
-						return
-					}
-					s.Write(buf[:n])
-				}
-			}(stream)
-		} else {
-			return
-		}
-	}
-}
-
-func TestEcho(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	const N = 100
-	buf := make([]byte, 10)
-	var sent string
-	var received string
-	for i := 0; i < N; i++ {
-		msg := fmt.Sprintf("hello%v", i)
-		stream.Write([]byte(msg))
-		sent += msg
-		if n, err := stream.Read(buf); err != nil {
-			t.Fatal(err)
-		} else {
-			received += string(buf[:n])
-		}
-	}
-	if sent != received {
-		t.Fatal("data mimatch")
-	}
-	session.Close()
-}
-
-func TestSpeed(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	t.Log(stream.LocalAddr(), stream.RemoteAddr())
-
-	start := time.Now()
-	var wg sync.WaitGroup
-	wg.Add(1)
-	go func() {
-		buf := make([]byte, 1024*1024)
-		nrecv := 0
-		for {
-			n, err := stream.Read(buf)
-			if err != nil {
-				t.Fatal(err)
-				break
-			} else {
-				nrecv += n
-				if nrecv == 4096*4096 {
-					break
-				}
-			}
-		}
-		stream.Close()
-		t.Log("time for 16MB rtt", time.Since(start))
-		wg.Done()
-	}()
-	msg := make([]byte, 8192)
-	for i := 0; i < 2048; i++ {
-		stream.Write(msg)
-	}
-	wg.Wait()
-	session.Close()
-}
-
-func TestParallel(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-
-	par := 1000
-	messages := 100
-	var wg sync.WaitGroup
-	wg.Add(par)
-	for i := 0; i < par; i++ {
-		stream, _ := session.OpenStream()
-		go func(s *Stream) {
-			buf := make([]byte, 20)
-			for j := 0; j < messages; j++ {
-				msg := fmt.Sprintf("hello%v", j)
-				s.Write([]byte(msg))
-				if _, err := s.Read(buf); err != nil {
-					break
-				}
-			}
-			s.Close()
-			wg.Done()
-		}(stream)
-	}
-	t.Log("created", session.NumStreams(), "streams")
-	wg.Wait()
-	session.Close()
-}
-
-func TestCloseThenOpen(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	session.Close()
-	if _, err := session.OpenStream(); err == nil {
-		t.Fatal("opened after close")
-	}
-}
-
-func TestStreamDoubleClose(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	stream.Close()
-	if err := stream.Close(); err == nil {
-		t.Log("double close doesn't return error")
-	}
-	session.Close()
-}
-
-func TestConcurrentClose(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	numStreams := 100
-	streams := make([]*Stream, 0, numStreams)
-	var wg sync.WaitGroup
-	wg.Add(numStreams)
-	for i := 0; i < 100; i++ {
-		stream, _ := session.OpenStream()
-		streams = append(streams, stream)
-	}
-	for _, s := range streams {
-		stream := s
-		go func() {
-			stream.Close()
-			wg.Done()
-		}()
-	}
-	session.Close()
-	wg.Wait()
-}
-
-func TestTinyReadBuffer(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	const N = 100
-	tinybuf := make([]byte, 6)
-	var sent string
-	var received string
-	for i := 0; i < N; i++ {
-		msg := fmt.Sprintf("hello%v", i)
-		sent += msg
-		nsent, err := stream.Write([]byte(msg))
-		if err != nil {
-			t.Fatal("cannot write")
-		}
-		nrecv := 0
-		for nrecv < nsent {
-			if n, err := stream.Read(tinybuf); err == nil {
-				nrecv += n
-				received += string(tinybuf[:n])
-			} else {
-				t.Fatal("cannot read with tiny buffer")
-			}
-		}
-	}
-
-	if sent != received {
-		t.Fatal("data mimatch")
-	}
-	session.Close()
-}
-
-func TestIsClose(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	session.Close()
-	if session.IsClosed() != true {
-		t.Fatal("still open after close")
-	}
-}
-
-func TestKeepAliveTimeout(t *testing.T) {
-	ln, err := net.Listen("tcp", "127.0.0.1:29999")
-	if err != nil {
-		// handle error
-		panic(err)
-	}
-	go func() {
-		ln.Accept()
-	}()
-
-	cli, err := net.Dial("tcp", "127.0.0.1:29999")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	config := DefaultConfig()
-	config.KeepAliveInterval = time.Second
-	config.KeepAliveTimeout = 2 * time.Second
-	session, _ := Client(cli, config)
-	<-time.After(3 * time.Second)
-	if session.IsClosed() != true {
-		t.Fatal("keepalive-timeout failed")
-	}
-}
-
-func TestServerEcho(t *testing.T) {
-	ln, err := net.Listen("tcp", "127.0.0.1:39999")
-	if err != nil {
-		// handle error
-		panic(err)
-	}
-	go func() {
-		if conn, err := ln.Accept(); err == nil {
-			session, _ := Server(conn, nil)
-			if stream, err := session.OpenStream(); err == nil {
-				const N = 100
-				buf := make([]byte, 10)
-				for i := 0; i < N; i++ {
-					msg := fmt.Sprintf("hello%v", i)
-					stream.Write([]byte(msg))
-					if n, err := stream.Read(buf); err != nil {
-						t.Fatal(err)
-					} else if string(buf[:n]) != msg {
-						t.Fatal(err)
-					}
-				}
-				stream.Close()
-			} else {
-				t.Fatal(err)
-			}
-		} else {
-			t.Fatal(err)
-		}
-	}()
-
-	cli, err := net.Dial("tcp", "127.0.0.1:39999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if session, err := Client(cli, nil); err == nil {
-		if stream, err := session.AcceptStream(); err == nil {
-			buf := make([]byte, 65536)
-			for {
-				n, err := stream.Read(buf)
-				if err != nil {
-					break
-				}
-				stream.Write(buf[:n])
-			}
-		} else {
-			t.Fatal(err)
-		}
-	} else {
-		t.Fatal(err)
-	}
-}
-
-func TestSendWithoutRecv(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	const N = 100
-	for i := 0; i < N; i++ {
-		msg := fmt.Sprintf("hello%v", i)
-		stream.Write([]byte(msg))
-	}
-	buf := make([]byte, 1)
-	if _, err := stream.Read(buf); err != nil {
-		t.Fatal(err)
-	}
-	stream.Close()
-}
-
-func TestWriteAfterClose(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	stream.Close()
-	if _, err := stream.Write([]byte("write after close")); err == nil {
-		t.Fatal("write after close failed")
-	}
-}
-
-func TestReadStreamAfterSessionClose(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	session.Close()
-	buf := make([]byte, 10)
-	if _, err := stream.Read(buf); err != nil {
-		t.Log(err)
-	} else {
-		t.Fatal("read stream after session close succeeded")
-	}
-}
-
-func TestWriteStreamAfterConnectionClose(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	session.conn.Close()
-	if _, err := stream.Write([]byte("write after connection close")); err == nil {
-		t.Fatal("write after connection close failed")
-	}
-}
-
-func TestNumStreamAfterClose(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	if _, err := session.OpenStream(); err == nil {
-		if session.NumStreams() != 1 {
-			t.Fatal("wrong number of streams after opened")
-		}
-		session.Close()
-		if session.NumStreams() != 0 {
-			t.Fatal("wrong number of streams after session closed")
-		}
-	} else {
-		t.Fatal(err)
-	}
-	cli.Close()
-}
-
-func TestRandomFrame(t *testing.T) {
-	// pure random
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	for i := 0; i < 100; i++ {
-		rnd := make([]byte, rand.Uint32()%1024)
-		io.ReadFull(crand.Reader, rnd)
-		session.conn.Write(rnd)
-	}
-	cli.Close()
-
-	// double syn
-	cli, err = net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ = Client(cli, nil)
-	for i := 0; i < 100; i++ {
-		f := newFrame(cmdSYN, 1000)
-		session.writeFrame(f)
-	}
-	cli.Close()
-
-	// random cmds
-	cli, err = net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	allcmds := []byte{cmdSYN, cmdFIN, cmdPSH, cmdNOP}
-	session, _ = Client(cli, nil)
-	for i := 0; i < 100; i++ {
-		f := newFrame(allcmds[rand.Int()%len(allcmds)], rand.Uint32())
-		session.writeFrame(f)
-	}
-	cli.Close()
-
-	// random cmds & sids
-	cli, err = net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ = Client(cli, nil)
-	for i := 0; i < 100; i++ {
-		f := newFrame(byte(rand.Uint32()), rand.Uint32())
-		session.writeFrame(f)
-	}
-	cli.Close()
-
-	// random version
-	cli, err = net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ = Client(cli, nil)
-	for i := 0; i < 100; i++ {
-		f := newFrame(byte(rand.Uint32()), rand.Uint32())
-		f.ver = byte(rand.Uint32())
-		session.writeFrame(f)
-	}
-	cli.Close()
-
-	// incorrect size
-	cli, err = net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ = Client(cli, nil)
-
-	f := newFrame(byte(rand.Uint32()), rand.Uint32())
-	rnd := make([]byte, rand.Uint32()%1024)
-	io.ReadFull(crand.Reader, rnd)
-	f.data = rnd
-
-	buf := make([]byte, headerSize+len(f.data))
-	buf[0] = f.ver
-	buf[1] = f.cmd
-	binary.LittleEndian.PutUint16(buf[2:], uint16(len(rnd)+1)) /// incorrect size
-	binary.LittleEndian.PutUint32(buf[4:], f.sid)
-	copy(buf[headerSize:], f.data)
-
-	session.conn.Write(buf)
-	t.Log(rawHeader(buf))
-	cli.Close()
-}
-
-func TestReadDeadline(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	const N = 100
-	buf := make([]byte, 10)
-	var readErr error
-	for i := 0; i < N; i++ {
-		msg := fmt.Sprintf("hello%v", i)
-		stream.Write([]byte(msg))
-		stream.SetReadDeadline(time.Now().Add(-1 * time.Minute))
-		if _, readErr = stream.Read(buf); readErr != nil {
-			break
-		}
-	}
-	if readErr != nil {
-		if !strings.Contains(readErr.Error(), "i/o timeout") {
-			t.Fatalf("Wrong error: %v", readErr)
-		}
-	} else {
-		t.Fatal("No error when reading with past deadline")
-	}
-	session.Close()
-}
-
-func TestWriteDeadline(t *testing.T) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		t.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	stream, _ := session.OpenStream()
-	buf := make([]byte, 10)
-	var writeErr error
-	for {
-		stream.SetWriteDeadline(time.Now().Add(-1 * time.Minute))
-		if _, writeErr = stream.Write(buf); writeErr != nil {
-			if !strings.Contains(writeErr.Error(), "i/o timeout") {
-				t.Fatalf("Wrong error: %v", writeErr)
-			}
-			break
-		}
-	}
-	session.Close()
-}
-
-func BenchmarkAcceptClose(b *testing.B) {
-	cli, err := net.Dial("tcp", "127.0.0.1:19999")
-	if err != nil {
-		b.Fatal(err)
-	}
-	session, _ := Client(cli, nil)
-	for i := 0; i < b.N; i++ {
-		if stream, err := session.OpenStream(); err == nil {
-			stream.Close()
-		} else {
-			b.Fatal(err)
-		}
-	}
-}
-func BenchmarkConnSmux(b *testing.B) {
-	cs, ss, err := getSmuxStreamPair()
-	if err != nil {
-		b.Fatal(err)
-	}
-	defer cs.Close()
-	defer ss.Close()
-	bench(b, cs, ss)
-}
-
-func BenchmarkConnTCP(b *testing.B) {
-	cs, ss, err := getTCPConnectionPair()
-	if err != nil {
-		b.Fatal(err)
-	}
-	defer cs.Close()
-	defer ss.Close()
-	bench(b, cs, ss)
-}
-
-func getSmuxStreamPair() (*Stream, *Stream, error) {
-	c1, c2, err := getTCPConnectionPair()
-	if err != nil {
-		return nil, nil, err
-	}
-
-	s, err := Server(c2, nil)
-	if err != nil {
-		return nil, nil, err
-	}
-	c, err := Client(c1, nil)
-	if err != nil {
-		return nil, nil, err
-	}
-	var ss *Stream
-	done := make(chan error)
-	go func() {
-		var rerr error
-		ss, rerr = s.AcceptStream()
-		done <- rerr
-		close(done)
-	}()
-	cs, err := c.OpenStream()
-	if err != nil {
-		return nil, nil, err
-	}
-	err = <-done
-	if err != nil {
-		return nil, nil, err
-	}
-
-	return cs, ss, nil
-}
-
-func getTCPConnectionPair() (net.Conn, net.Conn, error) {
-	lst, err := net.Listen("tcp", "127.0.0.1:0")
-	if err != nil {
-		return nil, nil, err
-	}
-
-	var conn0 net.Conn
-	var err0 error
-	done := make(chan struct{})
-	go func() {
-		conn0, err0 = lst.Accept()
-		close(done)
-	}()
-
-	conn1, err := net.Dial("tcp", lst.Addr().String())
-	if err != nil {
-		return nil, nil, err
-	}
-
-	<-done
-	if err0 != nil {
-		return nil, nil, err0
-	}
-	return conn0, conn1, nil
-}
-
-func bench(b *testing.B, rd io.Reader, wr io.Writer) {
-	buf := make([]byte, 128*1024)
-	buf2 := make([]byte, 128*1024)
-	b.SetBytes(128 * 1024)
-	b.ResetTimer()
-
-	var wg sync.WaitGroup
-	wg.Add(1)
-	go func() {
-		defer wg.Done()
-		count := 0
-		for {
-			n, _ := rd.Read(buf2)
-			count += n
-			if count == 128*1024*b.N {
-				return
-			}
-		}
-	}()
-	for i := 0; i < b.N; i++ {
-		wr.Write(buf)
-	}
-	wg.Wait()
-}

vendor/github.com/xtaci/smux/stream.go

@@ -1,261 +0,0 @@
-package smux
-
-import (
-	"bytes"
-	"io"
-	"net"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/pkg/errors"
-)
-
-// Stream implements net.Conn
-type Stream struct {
-	id            uint32
-	rstflag       int32
-	sess          *Session
-	buffer        bytes.Buffer
-	bufferLock    sync.Mutex
-	frameSize     int
-	chReadEvent   chan struct{} // notify a read event
-	die           chan struct{} // flag the stream has closed
-	dieLock       sync.Mutex
-	readDeadline  atomic.Value
-	writeDeadline atomic.Value
-}
-
-// newStream initiates a Stream struct
-func newStream(id uint32, frameSize int, sess *Session) *Stream {
-	s := new(Stream)
-	s.id = id
-	s.chReadEvent = make(chan struct{}, 1)
-	s.frameSize = frameSize
-	s.sess = sess
-	s.die = make(chan struct{})
-	return s
-}
-
-// ID returns the unique stream ID.
-func (s *Stream) ID() uint32 {
-	return s.id
-}
-
-// Read implements net.Conn
-func (s *Stream) Read(b []byte) (n int, err error) {
-	var deadline <-chan time.Time
-	if d, ok := s.readDeadline.Load().(time.Time); ok && !d.IsZero() {
-		timer := time.NewTimer(d.Sub(time.Now()))
-		defer timer.Stop()
-		deadline = timer.C
-	}
-
-READ:
-	select {
-	case <-s.die:
-		return 0, errors.New(errBrokenPipe)
-	case <-deadline:
-		return n, errTimeout
-	default:
-	}
-
-	s.bufferLock.Lock()
-	n, err = s.buffer.Read(b)
-	s.bufferLock.Unlock()
-
-	if n > 0 {
-		s.sess.returnTokens(n)
-		return n, nil
-	} else if atomic.LoadInt32(&s.rstflag) == 1 {
-		_ = s.Close()
-		return 0, io.EOF
-	}
-
-	select {
-	case <-s.chReadEvent:
-		goto READ
-	case <-deadline:
-		return n, errTimeout
-	case <-s.die:
-		return 0, errors.New(errBrokenPipe)
-	}
-}
-
-// Write implements net.Conn
-func (s *Stream) Write(b []byte) (n int, err error) {
-	var deadline <-chan time.Time
-	if d, ok := s.writeDeadline.Load().(time.Time); ok && !d.IsZero() {
-		timer := time.NewTimer(d.Sub(time.Now()))
-		defer timer.Stop()
-		deadline = timer.C
-	}
-
-	select {
-	case <-s.die:
-		return 0, errors.New(errBrokenPipe)
-	default:
-	}
-
-	frames := s.split(b, cmdPSH, s.id)
-	sent := 0
-	for k := range frames {
-		req := writeRequest{
-			frame:  frames[k],
-			result: make(chan writeResult, 1),
-		}
-
-		select {
-		case s.sess.writes <- req:
-		case <-s.die:
-			return sent, errors.New(errBrokenPipe)
-		case <-deadline:
-			return sent, errTimeout
-		}
-
-		select {
-		case result := <-req.result:
-			sent += result.n
-			if result.err != nil {
-				return sent, result.err
-			}
-		case <-s.die:
-			return sent, errors.New(errBrokenPipe)
-		case <-deadline:
-			return sent, errTimeout
-		}
-	}
-	return sent, nil
-}
-
-// Close implements net.Conn
-func (s *Stream) Close() error {
-	s.dieLock.Lock()
-
-	select {
-	case <-s.die:
-		s.dieLock.Unlock()
-		return errors.New(errBrokenPipe)
-	default:
-		close(s.die)
-		s.dieLock.Unlock()
-		s.sess.streamClosed(s.id)
-		_, err := s.sess.writeFrame(newFrame(cmdFIN, s.id))
-		return err
-	}
-}
-
-// SetReadDeadline sets the read deadline as defined by
-// net.Conn.SetReadDeadline.
-// A zero time value disables the deadline.
-func (s *Stream) SetReadDeadline(t time.Time) error {
-	s.readDeadline.Store(t)
-	return nil
-}
-
-// SetWriteDeadline sets the write deadline as defined by
-// net.Conn.SetWriteDeadline.
-// A zero time value disables the deadline.
-func (s *Stream) SetWriteDeadline(t time.Time) error {
-	s.writeDeadline.Store(t)
-	return nil
-}
-
-// SetDeadline sets both read and write deadlines as defined by
-// net.Conn.SetDeadline.
-// A zero time value disables the deadlines.
-func (s *Stream) SetDeadline(t time.Time) error {
-	if err := s.SetReadDeadline(t); err != nil {
-		return err
-	}
-	if err := s.SetWriteDeadline(t); err != nil {
-		return err
-	}
-	return nil
-}
-
-// session closes the stream
-func (s *Stream) sessionClose() {
-	s.dieLock.Lock()
-	defer s.dieLock.Unlock()
-
-	select {
-	case <-s.die:
-	default:
-		close(s.die)
-	}
-}
-
-// LocalAddr satisfies net.Conn interface
-func (s *Stream) LocalAddr() net.Addr {
-	if ts, ok := s.sess.conn.(interface {
-		LocalAddr() net.Addr
-	}); ok {
-		return ts.LocalAddr()
-	}
-	return nil
-}
-
-// RemoteAddr satisfies net.Conn interface
-func (s *Stream) RemoteAddr() net.Addr {
-	if ts, ok := s.sess.conn.(interface {
-		RemoteAddr() net.Addr
-	}); ok {
-		return ts.RemoteAddr()
-	}
-	return nil
-}
-
-// pushBytes a slice into buffer
-func (s *Stream) pushBytes(p []byte) {
-	s.bufferLock.Lock()
-	s.buffer.Write(p)
-	s.bufferLock.Unlock()
-}
-
-// recycleTokens transform remaining bytes to tokens(will truncate buffer)
-func (s *Stream) recycleTokens() (n int) {
-	s.bufferLock.Lock()
-	n = s.buffer.Len()
-	s.buffer.Reset()
-	s.bufferLock.Unlock()
-	return
-}
-
-// split large byte buffer into smaller frames, reference only
-func (s *Stream) split(bts []byte, cmd byte, sid uint32) []Frame {
-	frames := make([]Frame, 0, len(bts)/s.frameSize+1)
-	for len(bts) > s.frameSize {
-		frame := newFrame(cmd, sid)
-		frame.data = bts[:s.frameSize]
-		bts = bts[s.frameSize:]
-		frames = append(frames, frame)
-	}
-	if len(bts) > 0 {
-		frame := newFrame(cmd, sid)
-		frame.data = bts
-		frames = append(frames, frame)
-	}
-	return frames
-}
-
-// notify read event
-func (s *Stream) notifyReadEvent() {
-	select {
-	case s.chReadEvent <- struct{}{}:
-	default:
-	}
-}
-
-// mark this stream has been reset
-func (s *Stream) markRST() {
-	atomic.StoreInt32(&s.rstflag, 1)
-}
-
-var errTimeout error = &timeoutError{}
-
-type timeoutError struct{}
-
-func (e *timeoutError) Error() string   { return "i/o timeout" }
-func (e *timeoutError) Timeout() bool   { return true }
-func (e *timeoutError) Temporary() bool { return true }