├── .gitignore ├── .gitmodules ├── LICENSE ├── Makefile ├── README.md ├── greeter_client └── greeter_client.go └── greeter_multiplex_server └── greeter_multiplex_server.go /.gitignore: -------------------------------------------------------------------------------- 1 | /.gopath/ 2 | /bin/ 3 | /vendor/github.com/gdm85/grpc-go-multiplex 4 | -------------------------------------------------------------------------------- /.gitmodules: -------------------------------------------------------------------------------- 1 | [submodule "vendor/google.golang.org/grpc"] 2 | path = vendor/google.golang.org/grpc 3 | url = https://github.com/grpc/grpc-go 4 | [submodule "vendor/github.com/cockroachdb/cmux"] 5 | path = vendor/github.com/cockroachdb/cmux 6 | url = https://github.com/cockroachdb/cmux 7 | [submodule "vendor/golang.org/x/net"] 8 | path = vendor/golang.org/x/net 9 | url = https://github.com/golang/net 10 | [submodule "vendor/github.com/golang/protobuf"] 11 | path = vendor/github.com/golang/protobuf 12 | url = https://github.com/golang/protobuf 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | all: bin/greeter_client bin/greeter_multiplex_server 2 | 3 | setup-gopath: 4 | mkdir -p .gopath 5 | if [ ! -L .gopath/src ]; then ln -s "$(CURDIR)/vendor" .gopath/src; fi 6 | if [ ! -L .gopath/src/github.com/gdm85/grpc-go-multiplex ]; then ln -s "$(CURDIR)" .gopath/src/github.com/gdm85/grpc-go-multiplex; fi 7 | 8 | bin/add-torrent: setup-gopath 9 | mkdir -p bin 10 | cd examples && GO15VENDOREXPERIMENT=1 GOPATH="$(CURDIR)/.gopath" GOBIN="$(CURDIR)/bin/" go install add-torrent.go 11 | 12 | bin/greeter_multiplex_server: setup-gopath 13 | mkdir -p bin 14 | cd greeter_multiplex_server && GO15VENDOREXPERIMENT=1 GOPATH="$(CURDIR)/.gopath" GOBIN="$(CURDIR)/bin/" go install greeter_multiplex_server.go 15 | 16 | bin/greeter_client: setup-gopath 17 | mkdir -p bin 18 | cd greeter_client && GO15VENDOREXPERIMENT=1 GOPATH="$(CURDIR)/.gopath" GOBIN="$(CURDIR)/bin/" go install greeter_client.go 19 | 20 | clean: 21 | rm -f bin/greeter_client bin/greeter_multiplex_server 22 | 23 | .PHONY: all clean 24 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # grpc-go-multiplex 2 | 3 | This is a working example/proof-of-concept that shows how to use [soheilhy's excellent cmux package](http://github.com/soheilhy/cmux) (cockroachdb's fork is used here). 4 | 5 | This example covers a very specific use-case, as per [release blog post](https://medium.com/@gdm85/http-load-balancing-on-grpc-services-e3d702db05d7); for more use-cases give a look to the examples in [cmux' GoDocs](https://godoc.org/github.com/soheilhy/cmux). 6 | 7 | For upstream discussion, see https://github.com/grpc/grpc-go/issues/549. 8 | 9 | # License 10 | 11 | [GNU GPL version 2](./LICENSE) 12 | The greeter client side example is covered by a different BSD-style license (see [greeter_client.go](./greeter_client/greeter_client.go)). 13 | 14 | # How to build 15 | 16 | This project uses an automatically-provisioned GOPATH. Example init/building commands on a Linux system: 17 | 18 | ``` 19 | git submodule update --init --recursive 20 | make 21 | ``` 22 | 23 | # How to use 24 | 25 | Start the server-side in a terminal: 26 | ``` 27 | $ bin/greeter_multiplex_server 28 | 2016/08/27 16:20:21 listening and serving (multiplexed) on :50051 29 | ``` 30 | 31 | Make a gRPC test in another terminal with: 32 | ``` 33 | $ bin/greeter_client 34 | 2016/08/27 16:21:47 Greeting: Hello world 35 | ``` 36 | 37 | Test a status call (for example, as load-balancers would do) by fetching `/status`: 38 | ``` 39 | $ curl -v http://localhost:50051/status 40 | * Hostname was NOT found in DNS cache 41 | * Trying 127.0.0.1... 42 | * Connected to localhost (127.0.0.1) port 50051 (#0) 43 | > GET /status HTTP/1.1 44 | > User-Agent: curl/7.50.1 45 | > Host: localhost:50051 46 | > Accept: */* 47 | > 48 | < HTTP/1.1 200 OK 49 | < Date: Sat, 27 Aug 2016 14:24:02 GMT 50 | < Content-Length: 2 51 | < Content-Type: text/plain; charset=utf-8 52 | < 53 | * Connection #0 to host localhost left intact 54 | OK 55 | ``` 56 | 57 | And browse any other URL (via browser) to see normal HTML output: 58 | ``` 59 | $ curl http://localhost:50051/xxx 60 | Welcome to the home page! 61 | ``` 62 | -------------------------------------------------------------------------------- /greeter_client/greeter_client.go: -------------------------------------------------------------------------------- 1 | /* 2 | * 3 | * Copyright 2015, Google Inc. 4 | * All rights reserved. 5 | * 6 | * Redistribution and use in source and binary forms, with or without 7 | * modification, are permitted provided that the following conditions are 8 | * met: 9 | * 10 | * * Redistributions of source code must retain the above copyright 11 | * notice, this list of conditions and the following disclaimer. 12 | * * Redistributions in binary form must reproduce the above 13 | * copyright notice, this list of conditions and the following disclaimer 14 | * in the documentation and/or other materials provided with the 15 | * distribution. 16 | * * Neither the name of Google Inc. nor the names of its 17 | * contributors may be used to endorse or promote products derived from 18 | * this software without specific prior written permission. 19 | * 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 | * 32 | */ 33 | 34 | package main 35 | 36 | import ( 37 | "log" 38 | "os" 39 | 40 | "golang.org/x/net/context" 41 | "google.golang.org/grpc" 42 | pb "google.golang.org/grpc/examples/helloworld/helloworld" 43 | ) 44 | 45 | const ( 46 | address = "localhost:50051" 47 | defaultName = "world" 48 | ) 49 | 50 | func main() { 51 | // Set up a connection to the server. 52 | conn, err := grpc.Dial(address, grpc.WithInsecure()) 53 | if err != nil { 54 | log.Fatalf("did not connect: %v", err) 55 | } 56 | defer conn.Close() 57 | c := pb.NewGreeterClient(conn) 58 | 59 | // Contact the server and print out its response. 60 | name := defaultName 61 | if len(os.Args) > 1 { 62 | name = os.Args[1] 63 | } 64 | r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name}) 65 | if err != nil { 66 | log.Fatalf("could not greet: %v", err) 67 | } 68 | log.Printf("Greeting: %s", r.Message) 69 | } 70 | -------------------------------------------------------------------------------- /greeter_multiplex_server/greeter_multiplex_server.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | /* 4 | * grpc-go-multiplex - proof-of-concept for gRPC/HTTP traffic multiplexing 5 | * Copyright (C) 2016 gdm85 - https://github.com/gdm85/grpc-go-multiplex/ 6 | This program is free software; you can redistribute it and/or 7 | modify it under the terms of the GNU General Public License 8 | as published by the Free Software Foundation; either version 2 9 | of the License, or (at your option) any later version. 10 | This program is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | GNU General Public License for more details. 14 | You should have received a copy of the GNU General Public License 15 | along with this program; if not, write to the Free Software 16 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 17 | */ 18 | 19 | import ( 20 | "fmt" 21 | "log" 22 | "net" 23 | "net/http" 24 | "os" 25 | 26 | "github.com/cockroachdb/cmux" 27 | "golang.org/x/net/context" 28 | "google.golang.org/grpc" 29 | pb "google.golang.org/grpc/examples/helloworld/helloworld" 30 | ) 31 | 32 | // server is used to implement helloworld.GreeterServer. 33 | type server struct{} 34 | 35 | // SayHello implements helloworld.GreeterServer 36 | func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) { 37 | return &pb.HelloReply{Message: "Hello " + in.Name}, nil 38 | } 39 | 40 | const port = 50051 41 | 42 | func main() { 43 | // formatted address to listen on 44 | addr := fmt.Sprintf(":%d", port) 45 | l, err := net.Listen("tcp", addr) 46 | if err != nil { 47 | log.Fatal(err) 48 | } 49 | 50 | // create the cmux object that will multiplex 2 protocols on same port 51 | m := cmux.New(l) 52 | // match gRPC requests, otherwise regular HTTP requests 53 | grpcL := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc")) 54 | httpL := m.Match(cmux.Any()) 55 | 56 | // create the go-grpc example greeter server 57 | grpcS := grpc.NewServer() 58 | pb.RegisterGreeterServer(grpcS, &server{}) 59 | 60 | // create the regular HTTP requests muxer 61 | h := http.NewServeMux() 62 | h.HandleFunc("/status", func(w http.ResponseWriter, r *http.Request) { 63 | fmt.Fprintf(w, "OK") 64 | }) 65 | h.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { 66 | // The "/" pattern matches everything not matched by previous handlers 67 | fmt.Fprintf(w, "Welcome to the home page!") 68 | }) 69 | httpS := &http.Server{ 70 | Handler: h, 71 | } 72 | 73 | // collect on this channel the exits of each protocol's .Serve() call 74 | eps := make(chan error, 2) 75 | 76 | // start the listeners for each protocol 77 | go func() { eps <- grpcS.Serve(grpcL) }() 78 | go func() { eps <- httpS.Serve(httpL) }() 79 | 80 | log.Println("listening and serving (multiplexed) on", addr) 81 | err = m.Serve() 82 | 83 | // the rest of the code handles exit errors of the muxes 84 | 85 | var failed bool 86 | if err != nil { 87 | log.Println("cmux serve error: %v", err) 88 | failed = true 89 | } 90 | var i int 91 | for err := range eps { 92 | if err != nil { 93 | log.Printf("protocol serve error: %v", err) 94 | failed = true 95 | } 96 | i++ 97 | if i == cap(eps) { 98 | close(eps) 99 | break 100 | } 101 | } 102 | if failed { 103 | os.Exit(1) 104 | } 105 | } 106 | --------------------------------------------------------------------------------