GRPC是google开源的一个高性能、跨语言的RPC框架,基于HTTP2协议,基于protobuf 3.x,支持多种开发语言。 对于开发者而言: 1)需要使用protobuf定义接口,即.proto文件 2)然后使用compile工具生成特定语言的执行代码,比如JAVA、C/C++、Python等。类似于thrift,为了解决跨语言问题。 3)启动一个Server端,server端通过侦听指定的port,来等待Client链接请求。
本文以golang和php为例展开教程,使用golang做rpc server,php做rpc client,实现跨语言调用。
golang的rpc包,作为golang rpc server需要这个包
go get google.golang.org/grpc下载地址: http://pecl.php.net/package/gRPC 安装过程:
phpize ./configure --with-php-config=/usr/local/php/bin/php-config make make install # 添加grpc.so到php.ini配置 vim /usr/local/php/etc/php.ini extension = "grpc.so" php -m | grep "grpc" grpc命令行下将proto协议文件转换为多种语言对应格式的工具
下载地址:https://github.com/google/protobuf 安装
./configure make make install protoc --help Usage: protoc [OPTION] PROTO_FILES Parse PROTO_FILES and generate output based on the options given: ...在另一个命令行运行:
greeter_client "this is my message" 2017/08/30 21:55:25 Greeting: Hello this is my message (2). 手动生成go文件运行 假如我们有一个proto文件helloworld.proto: syntax = "proto3"; option java_multiple_files = true; option java_package = "io.grpc.examples.helloworld"; option java_outer_classname = "HelloWorldProto"; package helloworld; // The greeting service definition. service Greeter { // Sends a greeting rpc SayHello (HelloRequest) returns (HelloReply) {} } // The request message containing the user's name. message HelloRequest { string name = 1; } // The response message containing the greetings message HelloReply { string message = 1; }通过protoc将helloworld.proto转换生成对应的go文件:
protoc --go_out=plugins=grpc:. helloworld.proto得到helloworld.pb.go,不用编辑这个文件 这个文件属于package helloworld,你要适当放好他所在目录。 手动编辑greeter_server.go:
package main import ( "log" "net" "golang.org/x/net/context" "google.golang.org/grpc" pb "/helloworld" "google.golang.org/grpc/reflection" ) const ( port = ":50051" ) // server is used to implement helloworld.GreeterServer. type server struct{} // SayHello implements helloworld.GreeterServer func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) { return &pb.HelloReply{Message: "Hello " + in.Name}, nil } func main() { lis, err := net.Listen("tcp", port) if err != nil { log.Fatalf("failed to listen: %v", err) } s := grpc.NewServer() pb.RegisterGreeterServer(s, &server{}) // Register reflection service on gRPC server. reflection.Register(s) if err := s.Serve(lis); err != nil { log.Fatalf("failed to serve: %v", err) } }手动编辑greeter_client.go:
package main import ( "log" "os" "golang.org/x/net/context" "google.golang.org/grpc" pb "google.golang.org/grpc/examples/helloworld/helloworld" ) const ( address = "localhost:50051" defaultName = "world" ) func main() { // Set up a connection to the server. conn, err := grpc.Dial(address, grpc.WithInsecure()) if err != nil { log.Fatalf("did not connect: %v", err) } defer conn.Close() c := pb.NewGreeterClient(conn) // Contact the server and print out its response. name := defaultName if len(os.Args) > 1 { name = os.Args[1] } r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name}) if err != nil { log.Fatalf("could not greet: %v", err) } log.Printf("Greeting: %s", r.Message) }编译运行:
go build greeter_server.go && ./greeter_server & go build greeter_client.go && ./greeter_client "Message from My Build" 2017/08/30 22:04:56 Greeting: Hello Message from My Build参考 github.com/grpc/grpc/example/php 将此目录clone下来
git clone github.com/grpc/grpc.git git submodule update --init #如果只用php grpc client,此处不用make和make install #make #make install #为了生成grpc client stub code,最好make grpc_php_plugin make grpc_php_plugin cd grpc/example/php curl -sS https://getcomposer.org/installer | php php composer.phar installcomposer安装后会生成vendor和autoload.php文件,可自行选择添加到自己的项目中。 helloword.pb.php文件可以由protoc自定义生成:
protoc --php_out=./ helloworld.proto上面的方法只生成所有的proto对应的类,不生成实现grpc接口的stub client类。 使用下面的方法生成:参考grpc官方
protoc --proto_path=./ --php_out=./ --grpc_out=./ --plugin=protoc-gen-grpc=/data/src/grpc/bins/opt/grpc_php_plugin ./esselector.proto/data/src/grpc/是git clone github.com/grpc/grpc.git的目录。 该命令在grpc/src/php/bin/generate_proto_php.sh中。 如果出现:
bins/opt/grpc_php_plugin: program not found or is not executable --grpc_out: protoc-gen-grpc: Plugin failed with status code 1.是没有编译grpc_php_plugin,需要在grpc下:
make grpc_php_pluginphp greeter_client.php编辑内容:
require dirname(__FILE__).'/vendor/autoload.php'; // The following includes are needed when using protobuf 3.1.0 // and will suppress warnings when using protobuf 3.2.0+ include_once dirname(__FILE__).'/helloworld.pb.php'; include_once dirname(__FILE__).'/helloworld_grpc_pb.php'; function greet($name) { $client = new Helloworld\GreeterClient('127.0.0.1:50051', [ 'credentials' => Grpc\ChannelCredentials::createInsecure(), ]); $request = new Helloworld\HelloRequest(); $request->setName($name); list($reply, $status) = $client->SayHello($request)->wait(); $message = $reply->getMessage(); return $message; } $name = !empty($argv[1]) ? $argv[1] : 'world'; echo "the greet: ".greet($name)."\n";运行:
php ./greeter_client.php the greet: Hello world祝大家学习grpc顺利~