gRPC服务的定义和服务的种类
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grpc服务的定义和服务的种类
服务的定义
与许多RPC系统一样，gRPC基于定义服务、指定可以通过其参数和返回类型远程调用的方法的思想。默认情况下，gRPC使用protocol buffers作为接口定义语言(IDL)来描述服务接口和有效负载消息的结构。如果需要，也可以使用其他替代方案。
service HelloService {
rpc SayHello (HelloRequest) returns (HelloResponse);
}
message HelloRequest {
string greeting = 1;
}
message HelloResponse {
string reply = 1;
}
服务的种类
gRPC 允许您定义四种服务方法：
-
一元 RPC，其中客户端向服务器发送单个请求并获得单个响应，就像正常的函数调用一样。
rpc SayHello(HelloRequest) returns (HelloResponse); -
服务器流式 RPC，其中客户端向服务器发送请求并获取流以读回一系列消息。客户端从返回的流中读取，直到没有更多消息为止。gRPC 保证单个 RPC 调用中的消息顺序。
rpc LotsOfReplies(HelloRequest) returns (stream HelloResponse); -
客户端流式 RPC，其中客户端写入一系列消息并将它们发送到服务器，再次使用提供的流。一旦客户端完成了消息的写入，它就会等待服务器读取它们并返回它的响应。gRPC 再次保证了单个 RPC 调用中的消息顺序。
rpc LotsOfGreetings(stream HelloRequest) returns (HelloResponse); -
双向流式 RPC，双方使用读写流发送一系列消息。这两个流独立运行，因此客户端和服务器可以按照他们喜欢的任何顺序读取和写入：例如，服务器可以在写入响应之前等待接收所有客户端消息，或者它可以交替读取消息然后写入消息，或其他一些读取和写入的组合。保留每个流中消息的顺序。
rpc BidiHello(stream HelloRequest) returns (stream HelloResponse);
grpc stream实例1-服务端单向流
创建protobuf message
syntax = "proto3";
option go_package= "./;pb";
package pb;
service Greeter {
// 服务端 推送流
rpc GetStream (StreamReqData) returns (stream StreamResData){}
}
// request
message StreamReqData {
string data = 1;
}
// response
message StreamResData {
string data = 1;
}
编译
protoc --go_out=./pb ./pb/hello.proto
protoc --go-grpc_out=./pb ./pb/hello.proto
生成的文件
pb\hello.pb.go：
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.21.6
// source: pb/hello.proto
package pb
import (
protoreflect "谷歌.golang.org/protobuf/reflect/protoreflect"
protoimpl "谷歌.golang.org/protobuf/runtime/protoimpl"
reflect "reflect"
sync "sync"
)
const (
// Verify that this generated code is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
// Verify that runtime/protoimpl is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)
// request
type StreamReqData struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Data string `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
}
func (x *StreamReqData) Reset() {
*x = StreamReqData{}
if protoimpl.UnsafeEnabled {
mi := &file_pb_hello_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *StreamReqData) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*StreamReqData) ProtoMessage() {}
func (x *StreamReqData) ProtoReflect() protoreflect.Message {
mi := &file_pb_hello_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use StreamReqData.ProtoReflect.Descriptor instead.
func (*StreamReqData) Descriptor() ([]byte, []int) {
return file_pb_hello_proto_rawDescGZIP(), []int{0}
}
func (x *StreamReqData) GetData() string {
if x != nil {
return x.Data
}
return ""
}
// response
type StreamResData struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Data string `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
}
func (x *StreamResData) Reset() {
*x = StreamResData{}
if protoimpl.UnsafeEnabled {
mi := &file_pb_hello_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *StreamResData) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*StreamResData) ProtoMessage() {}
func (x *StreamResData) ProtoReflect() protoreflect.Message {
mi := &file_pb_hello_proto_msgTypes[1]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use StreamResData.ProtoReflect.Descriptor instead.
func (*StreamResData) Descriptor() ([]byte, []int) {
return file_pb_hello_proto_rawDescGZIP(), []int{1}
}
func (x *StreamResData) GetData() string {
if x != nil {
return x.Data
}
return ""
}
var File_pb_hello_proto protoreflect.FileDescriptor
var file_pb_hello_proto_rawDesc = []byte{
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}
var (
file_pb_hello_proto_rawDescOnce sync.Once
file_pb_hello_proto_rawDescData = file_pb_hello_proto_rawDesc
)
func file_pb_hello_proto_rawDescGZIP() []byte {
file_pb_hello_proto_rawDescOnce.Do(func() {
file_pb_hello_proto_rawDescData = protoimpl.X.CompressGZIP(file_pb_hello_proto_rawDescData)
})
return file_pb_hello_proto_rawDescData
}
var file_pb_hello_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_pb_hello_proto_goTypes = []interface{}{
(*StreamReqData)(nil), // 0: pb.StreamReqData
(*StreamResData)(nil), // 1: pb.StreamResData
}
var file_pb_hello_proto_depIdxs = []int32{
0, // 0: pb.Greeter.GetStream:input_type -> pb.StreamReqData
1, // 1: pb.Greeter.GetStream:output_type -> pb.StreamResData
1, // [1:2] is the sub-list for method output_type
0, // [0:1] is the sub-list for method input_type
0, // [0:0] is the sub-list for extension type_name
0, // [0:0] is the sub-list for extension extendee
0, // [0:0] is the sub-list for field type_name
}
func init() { file_pb_hello_proto_init() }
func file_pb_hello_proto_init() {
if File_pb_hello_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_pb_hello_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*StreamReqData); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_pb_hello_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*StreamResData); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
type x struct{}
out := protoimpl.TypeBuilder{
File: protoimpl.DescBuilder{
GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_pb_hello_proto_rawDesc,
NumEnums: 0,
NumMessages: 2,
NumExtensions: 0,
NumServices: 1,
},
GoTypes: file_pb_hello_proto_goTypes,
DependencyIndexes: file_pb_hello_proto_depIdxs,
MessageInfos: file_pb_hello_proto_msgTypes,
}.Build()
File_pb_hello_proto = out.File
file_pb_hello_proto_rawDesc = nil
file_pb_hello_proto_goTypes = nil
file_pb_hello_proto_depIdxs = nil
}
pb\hello_grpc.pb.go：
// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
package pb
import (
context "context"
grpc "谷歌.golang.org/grpc"
codes "谷歌.golang.org/grpc/codes"
status "谷歌.golang.org/grpc/status"
)
// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
// Requires gRPC-Go v1.32.0 or later.
const _ = grpc.SupportPackageIsVersion7
// GreeterClient is the client API for Greeter service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/谷歌.golang.org/grpc/?tab=doc#ClientConn.NewStream.
type GreeterClient interface {
// 服务端 推送流
GetStream(ctx context.Context, in *StreamReqData, opts ...grpc.CallOption) (Greeter_GetStreamClient, error)
}
type greeterClient struct {
cc grpc.ClientConnInterface
}
func NewGreeterClient(cc grpc.ClientConnInterface) GreeterClient {
return &greeterClient{cc}
}
func (c *greeterClient) GetStream(ctx context.Context, in *StreamReqData, opts ...grpc.CallOption) (Greeter_GetStreamClient, error) {
stream, err := c.cc.NewStream(ctx, &Greeter_ServiceDesc.Streams[0], "/pb.Greeter/GetStream", opts...)
if err != nil {
return nil, err
}
x := &greeterGetStreamClient{stream}
if err := x.ClientStream.SendMsg(in); err != nil {
return nil, err
}
if err := x.ClientStream.CloseSend(); err != nil {
return nil, err
}
return x, nil
}
type Greeter_GetStreamClient interface {
Recv() (*StreamResData, error)
grpc.ClientStream
}
type greeterGetStreamClient struct {
grpc.ClientStream
}
func (x *greeterGetStreamClient) Recv() (*StreamResData, error) {
m := new(StreamResData)
if err := x.ClientStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// GreeterServer is the server API for Greeter service.
// All implementations must embed UnimplementedGreeterServer
// for forward compatibility
type GreeterServer interface {
// 服务端 推送流
GetStream(*StreamReqData, Greeter_GetStreamServer) error
mustEmbedUnimplementedGreeterServer()
}
// UnimplementedGreeterServer must be embedded to have forward compatible implementations.
type UnimplementedGreeterServer struct {
}
func (UnimplementedGreeterServer) GetStream(*StreamReqData, Greeter_GetStreamServer) error {
return status.Errorf(codes.Unimplemented, "method GetStream not implemented")
}
func (UnimplementedGreeterServer) mustEmbedUnimplementedGreeterServer() {}
// UnsafeGreeterServer may be embedded to opt out of forward compatibility for this service.
// Use of this interface is not recommended, as added methods to GreeterServer will
// result in compilation errors.
type UnsafeGreeterServer interface {
mustEmbedUnimplementedGreeterServer()
}
func RegisterGreeterServer(s grpc.ServiceRegistrar, srv GreeterServer) {
s.RegisterService(&Greeter_ServiceDesc, srv)
}
func _Greeter_GetStream_Handler(srv interface{}, stream grpc.ServerStream) error {
m := new(StreamReqData)
if err := stream.RecvMsg(m); err != nil {
return err
}
return srv.(GreeterServer).GetStream(m, &greeterGetStreamServer{stream})
}
type Greeter_GetStreamServer interface {
Send(*StreamResData) error
grpc.ServerStream
}
type greeterGetStreamServer struct {
grpc.ServerStream
}
func (x *greeterGetStreamServer) Send(m *StreamResData) error {
return x.ServerStream.SendMsg(m)
}
// Greeter_ServiceDesc is the grpc.ServiceDesc for Greeter service.
// It's only intended for direct use with grpc.RegisterService,
// and not to be introspected or modified (even as a copy)
var Greeter_ServiceDesc = grpc.ServiceDesc{
ServiceName: "pb.Greeter",
HandlerType: (*GreeterServer)(nil),
Methods: []grpc.MethodDesc{},
Streams: []grpc.StreamDesc{
{
StreamName: "GetStream",
Handler: _Greeter_GetStream_Handler,
ServerStreams: true,
},
},
Metadata: "pb/hello.proto",
}
服务器端实现
package main
import (
"fmt"
"net"
pb "pro01/pb"
"time"
"谷歌.golang.org/grpc"
)
const PORT = ":50051"
type server struct {
pb.UnimplementedGreeterServer
}
// 服务端 单向流
func (s *server) GetStream(req *pb.StreamReqData, res pb.Greeter_GetStreamServer) error {
i := 0
for {
i
res.Send(&pb.StreamResData{Data: fmt.Sprintf("%v", time.Now().Unix())})
time.Sleep(1 * time.Second)
if i > 10 {
break
}
}
return nil
}
func main() {
//监听
lis, err := net.Listen("tcp", PORT)
if err != nil {
return
}
fmt.Println("服务器开始推送...")
//创建一个grpc服务器
s := grpc.NewServer()
//注册事件
pb.RegisterGreeterServer(s, &server{})
//处理链接
s.Serve(lis)
}
客户端实现
package main
import (
"context"
"log"
pb "pro01/pb"
"谷歌.golang.org/grpc"
)
const (
ADDRESS = "localhost:50051"
)
func main() {
// 通过grpc库，建立一个连接
conn, err := grpc.Dial(ADDRESS, grpc.WithInsecure())
if err != nil {
return
}
defer conn.Close()
//通过建立的连接生成一个client对象
c := pb.NewGreeterClient(conn)
//调用服务器端推送流
reqstreamData := &pb.StreamReqData{Data: "Psych"}
res, _ := c.GetStream(context.Background(), reqstreamData)
for {
aa, err := res.Recv()
if err != nil {
log.Println(err)
break
}
log.Println(aa)
}
}
运行结果
go run server/main.go
go run client/main.go
grpc stream实例2-客户端单向流
创建protobuf message
syntax = "proto3";
option go_package= "./;pb";
package pb;
service Greeter {
// 客户端 推送流
rpc PutStream (stream StreamReqData) returns (StreamResData){}
}
// request
message StreamReqData {
string data = 1;
}
// response
message StreamResData {
string data = 1;
}
编译
protoc --go_out=./pb ./pb/hello.proto
protoc --go-grpc_out=./pb ./pb/hello.proto
生成的文件
pb\hello.pb.go：
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.21.6
// source: pb/hello.proto
package pb
import (
protoreflect "谷歌.golang.org/protobuf/reflect/protoreflect"
protoimpl "谷歌.golang.org/protobuf/runtime/protoimpl"
reflect "reflect"
sync "sync"
)
const (
// Verify that this generated code is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
// Verify that runtime/protoimpl is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)
// request
type StreamReqData struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Data string `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
}
func (x *StreamReqData) Reset() {
*x = StreamReqData{}
if protoimpl.UnsafeEnabled {
mi := &file_pb_hello_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *StreamReqData) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*StreamReqData) ProtoMessage() {}
func (x *StreamReqData) ProtoReflect() protoreflect.Message {
mi := &file_pb_hello_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use StreamReqData.ProtoReflect.Descriptor instead.
func (*StreamReqData) Descriptor() ([]byte, []int) {
return file_pb_hello_proto_rawDescGZIP(), []int{0}
}
func (x *StreamReqData) GetData() string {
if x != nil {
return x.Data
}
return ""
}
// response
type StreamResData struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Data string `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
}
func (x *StreamResData) Reset() {
*x = StreamResData{}
if protoimpl.UnsafeEnabled {
mi := &file_pb_hello_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *StreamResData) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*StreamResData) ProtoMessage() {}
func (x *StreamResData) ProtoReflect() protoreflect.Message {
mi := &file_pb_hello_proto_msgTypes[1]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use StreamResData.ProtoReflect.Descriptor instead.
func (*StreamResData) Descriptor() ([]byte, []int) {
return file_pb_hello_proto_rawDescGZIP(), []int{1}
}
func (x *StreamResData) GetData() string {
if x != nil {
return x.Data
}
return ""
}
var File_pb_hello_proto protoreflect.FileDescriptor
var file_pb_hello_proto_rawDesc = []byte{
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}
var (
file_pb_hello_proto_rawDescOnce sync.Once
file_pb_hello_proto_rawDescData = file_pb_hello_proto_rawDesc
)
func file_pb_hello_proto_rawDescGZIP() []byte {
file_pb_hello_proto_rawDescOnce.Do(func() {
file_pb_hello_proto_rawDescData = protoimpl.X.CompressGZIP(file_pb_hello_proto_rawDescData)
})
return file_pb_hello_proto_rawDescData
}
var file_pb_hello_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_pb_hello_proto_goTypes = []interface{}{
(*StreamReqData)(nil), // 0: pb.StreamReqData
(*StreamResData)(nil), // 1: pb.StreamResData
}
var file_pb_hello_proto_depIdxs = []int32{
0, // 0: pb.Greeter.PutStream:input_type -> pb.StreamReqData
1, // 1: pb.Greeter.PutStream:output_type -> pb.StreamResData
1, // [1:2] is the sub-list for method output_type
0, // [0:1] is the sub-list for method input_type
0, // [0:0] is the sub-list for extension type_name
0, // [0:0] is the sub-list for extension extendee
0, // [0:0] is the sub-list for field type_name
}
func init() { file_pb_hello_proto_init() }
func file_pb_hello_proto_init() {
if File_pb_hello_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_pb_hello_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*StreamReqData); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_pb_hello_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*StreamResData); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
type x struct{}
out := protoimpl.TypeBuilder{
File: protoimpl.DescBuilder{
GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_pb_hello_proto_rawDesc,
NumEnums: 0,
NumMessages: 2,
NumExtensions: 0,
NumServices: 1,
},
GoTypes: file_pb_hello_proto_goTypes,
DependencyIndexes: file_pb_hello_proto_depIdxs,
MessageInfos: file_pb_hello_proto_msgTypes,
}.Build()
File_pb_hello_proto = out.File
file_pb_hello_proto_rawDesc = nil
file_pb_hello_proto_goTypes = nil
file_pb_hello_proto_depIdxs = nil
}
pb\hello_grpc.pb.go：
// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
package pb
import (
context "context"
grpc "谷歌.golang.org/grpc"
codes "谷歌.golang.org/grpc/codes"
status "谷歌.golang.org/grpc/status"
)
// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
// Requires gRPC-Go v1.32.0 or later.
const _ = grpc.SupportPackageIsVersion7
// GreeterClient is the client API for Greeter service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/谷歌.golang.org/grpc/?tab=doc#ClientConn.NewStream.
type GreeterClient interface {
// 客户端 推送流
PutStream(ctx context.Context, opts ...grpc.CallOption) (Greeter_PutStreamClient, error)
}
type greeterClient struct {
cc grpc.ClientConnInterface
}
func NewGreeterClient(cc grpc.ClientConnInterface) GreeterClient {
return &greeterClient{cc}
}
func (c *greeterClient) PutStream(ctx context.Context, opts ...grpc.CallOption) (Greeter_PutStreamClient, error) {
stream, err := c.cc.NewStream(ctx, &Greeter_ServiceDesc.Streams[0], "/pb.Greeter/PutStream", opts...)
if err != nil {
return nil, err
}
x := &greeterPutStreamClient{stream}
return x, nil
}
type Greeter_PutStreamClient interface {
Send(*StreamReqData) error
CloseAndRecv() (*StreamResData, error)
grpc.ClientStream
}
type greeterPutStreamClient struct {
grpc.ClientStream
}
func (x *greeterPutStreamClient) Send(m *StreamReqData) error {
return x.ClientStream.SendMsg(m)
}
func (x *greeterPutStreamClient) CloseAndRecv() (*StreamResData, error) {
if err := x.ClientStream.CloseSend(); err != nil {
return nil, err
}
m := new(StreamResData)
if err := x.ClientStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// GreeterServer is the server API for Greeter service.
// All implementations must embed UnimplementedGreeterServer
// for forward compatibility
type GreeterServer interface {
// 客户端 推送流
PutStream(Greeter_PutStreamServer) error
mustEmbedUnimplementedGreeterServer()
}
// UnimplementedGreeterServer must be embedded to have forward compatible implementations.
type UnimplementedGreeterServer struct {
}
func (UnimplementedGreeterServer) PutStream(Greeter_PutStreamServer) error {
return status.Errorf(codes.Unimplemented, "method PutStream not implemented")
}
func (UnimplementedGreeterServer) mustEmbedUnimplementedGreeterServer() {}
// UnsafeGreeterServer may be embedded to opt out of forward compatibility for this service.
// Use of this interface is not recommended, as added methods to GreeterServer will
// result in compilation errors.
type UnsafeGreeterServer interface {
mustEmbedUnimplementedGreeterServer()
}
func RegisterGreeterServer(s grpc.ServiceRegistrar, srv GreeterServer) {
s.RegisterService(&Greeter_ServiceDesc, srv)
}
func _Greeter_PutStream_Handler(srv interface{}, stream grpc.ServerStream) error {
return srv.(GreeterServer).PutStream(&greeterPutStreamServer{stream})
}
type Greeter_PutStreamServer interface {
SendAndClose(*StreamResData) error
Recv() (*StreamReqData, error)
grpc.ServerStream
}
type greeterPutStreamServer struct {
grpc.ServerStream
}
func (x *greeterPutStreamServer) SendAndClose(m *StreamResData) error {
return x.ServerStream.SendMsg(m)
}
func (x *greeterPutStreamServer) Recv() (*StreamReqData, error) {
m := new(StreamReqData)
if err := x.ServerStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// Greeter_ServiceDesc is the grpc.ServiceDesc for Greeter service.
// It's only intended for direct use with grpc.RegisterService,
// and not to be introspected or modified (even as a copy)
var Greeter_ServiceDesc = grpc.ServiceDesc{
ServiceName: "pb.Greeter",
HandlerType: (*GreeterServer)(nil),
Methods: []grpc.MethodDesc{},
Streams: []grpc.StreamDesc{
{
StreamName: "PutStream",
Handler: _Greeter_PutStream_Handler,
ClientStreams: true,
},
},
Metadata: "pb/hello.proto",
}
服务器端实现
package main
import (
"log"
"net"
pb "pro01/pb"
"谷歌.golang.org/grpc"
)
const PORT = ":50051"
type server struct {
pb.UnimplementedGreeterServer
}
// 客户端 单向流
func (s *server) PutStream(cliStr pb.Greeter_PutStreamServer) error {
for {
if tem, err := cliStr.Recv(); err == nil {
log.Println(tem)
} else {
log.Println("break, err :", err)
break
}
}
return nil
}
func main() {
//监听
lis, err := net.Listen("tcp", PORT)
if err != nil {
return
}
//创建一个grpc服务器
s := grpc.NewServer()
//注册事件
pb.RegisterGreeterServer(s, &server{})
//处理链接
s.Serve(lis)
}
客户端实现
package main
import (
"context"
pb "pro01/pb"
"time"
"谷歌.golang.org/grpc"
)
const (
ADDRESS = "localhost:50051"
)
func main() {
// 通过grpc库，建立一个连接
conn, err := grpc.Dial(ADDRESS, grpc.WithInsecure())
if err != nil {
return
}
defer conn.Close()
//通过建立的连接生成一个client对象
c := pb.NewGreeterClient(conn)
//客户端推送流
putRes, _ := c.PutStream(context.Background())
i := 1
for {
i
putRes.Send(&pb.StreamReqData{Data: "Psych"})
time.Sleep(time.Second)
if i > 10 {
break
}
}
}
运行结果
go run server/main.go
go run client/main.go
grpc stream实例3-双向流
创建protobuf message
syntax = "proto3";
option go_package= "./;pb";
package pb;
service Greeter {
// 双向流
rpc AllStream (stream StreamReqData) returns (stream StreamResData){}
}
// request
message StreamReqData {
string data = 1;
}
// response
message StreamResData {
string data = 1;
}
编译
protoc --go_out=./pb ./pb/hello.proto
protoc --go-grpc_out=./pb ./pb/hello.proto
生成的文件
pb\hello.pb.go：
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.21.6
// source: pb/hello.proto
package pb
import (
protoreflect "谷歌.golang.org/protobuf/reflect/protoreflect"
protoimpl "谷歌.golang.org/protobuf/runtime/protoimpl"
reflect "reflect"
sync "sync"
)
const (
// Verify that this generated code is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
// Verify that runtime/protoimpl is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)
// request
type StreamReqData struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Data string `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
}
func (x *StreamReqData) Reset() {
*x = StreamReqData{}
if protoimpl.UnsafeEnabled {
mi := &file_pb_hello_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *StreamReqData) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*StreamReqData) ProtoMessage() {}
func (x *StreamReqData) ProtoReflect() protoreflect.Message {
mi := &file_pb_hello_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use StreamReqData.ProtoReflect.Descriptor instead.
func (*StreamReqData) Descriptor() ([]byte, []int) {
return file_pb_hello_proto_rawDescGZIP(), []int{0}
}
func (x *StreamReqData) GetData() string {
if x != nil {
return x.Data
}
return ""
}
// response
type StreamResData struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Data string `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
}
func (x *StreamResData) Reset() {
*x = StreamResData{}
if protoimpl.UnsafeEnabled {
mi := &file_pb_hello_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *StreamResData) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*StreamResData) ProtoMessage() {}
func (x *StreamResData) ProtoReflect() protoreflect.Message {
mi := &file_pb_hello_proto_msgTypes[1]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use StreamResData.ProtoReflect.Descriptor instead.
func (*StreamResData) Descriptor() ([]byte, []int) {
return file_pb_hello_proto_rawDescGZIP(), []int{1}
}
func (x *StreamResData) GetData() string {
if x != nil {
return x.Data
}
return ""
}
var File_pb_hello_proto protoreflect.FileDescriptor
var file_pb_hello_proto_rawDesc = []byte{
0x0a, 0x0e, 0x70, 0x62, 0x2f, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
0x12, 0x02, 0x70, 0x62, 0x22, 0x23, 0x0a, 0x0d, 0x53, 0x74, 0x72, 0x65, 0x61, 0x6d, 0x52, 0x65,
0x71, 0x44, 0x61, 0x74, 0x61, 0x12, 0x12, 0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20,
0x01, 0x28, 0x09, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61, 0x22, 0x23, 0x0a, 0x0d, 0x53, 0x74, 0x72,
0x65, 0x61, 0x6d, 0x52, 0x65, 0x73, 0x44, 0x61, 0x74, 0x61, 0x12, 0x12, 0x0a, 0x04, 0x64, 0x61,
0x74, 0x61, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61, 0x32, 0x42,
0x0a, 0x07, 0x47, 0x72, 0x65, 0x65, 0x74, 0x65, 0x72, 0x12, 0x37, 0x0a, 0x09, 0x41, 0x6c, 0x6c,
0x53, 0x74, 0x72, 0x65, 0x61, 0x6d, 0x12, 0x11, 0x2e, 0x70, 0x62, 0x2e, 0x53, 0x74, 0x72, 0x65,
0x61, 0x6d, 0x52, 0x65, 0x71, 0x44, 0x61, 0x74, 0x61, 0x1a, 0x11, 0x2e, 0x70, 0x62, 0x2e, 0x53,
0x74, 0x72, 0x65, 0x61, 0x6d, 0x52, 0x65, 0x73, 0x44, 0x61, 0x74, 0x61, 0x22, 0x00, 0x28, 0x01,
0x30, 0x01, 0x42, 0x07, 0x5a, 0x05, 0x2e, 0x2f, 0x3b, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f,
0x74, 0x6f, 0x33,
}
var (
file_pb_hello_proto_rawDescOnce sync.Once
file_pb_hello_proto_rawDescData = file_pb_hello_proto_rawDesc
)
func file_pb_hello_proto_rawDescGZIP() []byte {
file_pb_hello_proto_rawDescOnce.Do(func() {
file_pb_hello_proto_rawDescData = protoimpl.X.CompressGZIP(file_pb_hello_proto_rawDescData)
})
return file_pb_hello_proto_rawDescData
}
var file_pb_hello_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_pb_hello_proto_goTypes = []interface{}{
(*StreamReqData)(nil), // 0: pb.StreamReqData
(*StreamResData)(nil), // 1: pb.StreamResData
}
var file_pb_hello_proto_depIdxs = []int32{
0, // 0: pb.Greeter.AllStream:input_type -> pb.StreamReqData
1, // 1: pb.Greeter.AllStream:output_type -> pb.StreamResData
1, // [1:2] is the sub-list for method output_type
0, // [0:1] is the sub-list for method input_type
0, // [0:0] is the sub-list for extension type_name
0, // [0:0] is the sub-list for extension extendee
0, // [0:0] is the sub-list for field type_name
}
func init() { file_pb_hello_proto_init() }
func file_pb_hello_proto_init() {
if File_pb_hello_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_pb_hello_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*StreamReqData); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_pb_hello_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*StreamResData); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
type x struct{}
out := protoimpl.TypeBuilder{
File: protoimpl.DescBuilder{
GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_pb_hello_proto_rawDesc,
NumEnums: 0,
NumMessages: 2,
NumExtensions: 0,
NumServices: 1,
},
GoTypes: file_pb_hello_proto_goTypes,
DependencyIndexes: file_pb_hello_proto_depIdxs,
MessageInfos: file_pb_hello_proto_msgTypes,
}.Build()
File_pb_hello_proto = out.File
file_pb_hello_proto_rawDesc = nil
file_pb_hello_proto_goTypes = nil
file_pb_hello_proto_depIdxs = nil
}
pb\hello_grpc.pb.go：
// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
package pb
import (
context "context"
grpc "谷歌.golang.org/grpc"
codes "谷歌.golang.org/grpc/codes"
status "谷歌.golang.org/grpc/status"
)
// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
// Requires gRPC-Go v1.32.0 or later.
const _ = grpc.SupportPackageIsVersion7
// GreeterClient is the client API for Greeter service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/谷歌.golang.org/grpc/?tab=doc#ClientConn.NewStream.
type GreeterClient interface {
// 双向流
AllStream(ctx context.Context, opts ...grpc.CallOption) (Greeter_AllStreamClient, error)
}
type greeterClient struct {
cc grpc.ClientConnInterface
}
func NewGreeterClient(cc grpc.ClientConnInterface) GreeterClient {
return &greeterClient{cc}
}
func (c *greeterClient) AllStream(ctx context.Context, opts ...grpc.CallOption) (Greeter_AllStreamClient, error) {
stream, err := c.cc.NewStream(ctx, &Greeter_ServiceDesc.Streams[0], "/pb.Greeter/AllStream", opts...)
if err != nil {
return nil, err
}
x := &greeterAllStreamClient{stream}
return x, nil
}
type Greeter_AllStreamClient interface {
Send(*StreamReqData) error
Recv() (*StreamResData, error)
grpc.ClientStream
}
type greeterAllStreamClient struct {
grpc.ClientStream
}
func (x *greeterAllStreamClient) Send(m *StreamReqData) error {
return x.ClientStream.SendMsg(m)
}
func (x *greeterAllStreamClient) Recv() (*StreamResData, error) {
m := new(StreamResData)
if err := x.ClientStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// GreeterServer is the server API for Greeter service.
// All implementations must embed UnimplementedGreeterServer
// for forward compatibility
type GreeterServer interface {
// 双向流
AllStream(Greeter_AllStreamServer) error
mustEmbedUnimplementedGreeterServer()
}
// UnimplementedGreeterServer must be embedded to have forward compatible implementations.
type UnimplementedGreeterServer struct {
}
func (UnimplementedGreeterServer) AllStream(Greeter_AllStreamServer) error {
return status.Errorf(codes.Unimplemented, "method AllStream not implemented")
}
func (UnimplementedGreeterServer) mustEmbedUnimplementedGreeterServer() {}
// UnsafeGreeterServer may be embedded to opt out of forward compatibility for this service.
// Use of this interface is not recommended, as added methods to GreeterServer will
// result in compilation errors.
type UnsafeGreeterServer interface {
mustEmbedUnimplementedGreeterServer()
}
func RegisterGreeterServer(s grpc.ServiceRegistrar, srv GreeterServer) {
s.RegisterService(&Greeter_ServiceDesc, srv)
}
func _Greeter_AllStream_Handler(srv interface{}, stream grpc.ServerStream) error {
return srv.(GreeterServer).AllStream(&greeterAllStreamServer{stream})
}
type Greeter_AllStreamServer interface {
Send(*StreamResData) error
Recv() (*StreamReqData, error)
grpc.ServerStream
}
type greeterAllStreamServer struct {
grpc.ServerStream
}
func (x *greeterAllStreamServer) Send(m *StreamResData) error {
return x.ServerStream.SendMsg(m)
}
func (x *greeterAllStreamServer) Recv() (*StreamReqData, error) {
m := new(StreamReqData)
if err := x.ServerStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// Greeter_ServiceDesc is the grpc.ServiceDesc for Greeter service.
// It's only intended for direct use with grpc.RegisterService,
// and not to be introspected or modified (even as a copy)
var Greeter_ServiceDesc = grpc.ServiceDesc{
ServiceName: "pb.Greeter",
HandlerType: (*GreeterServer)(nil),
Methods: []grpc.MethodDesc{},
Streams: []grpc.StreamDesc{
{
StreamName: "AllStream",
Handler: _Greeter_AllStream_Handler,
ServerStreams: true,
ClientStreams: true,
},
},
Metadata: "pb/hello.proto",
}
服务器端实现
package main
import (
"fmt"
"log"
"net"
pb "pro01/pb"
"sync"
"time"
"谷歌.golang.org/grpc"
)
const PORT = ":50051"
type server struct {
pb.UnimplementedGreeterServer
}
// 服务器端客户端 双向流
func (s *server) AllStream(allStr pb.Greeter_AllStreamServer) error {
wg := sync.WaitGroup{}
wg.Add(2)
// 接收数据
go func() {
for {
data, _ := allStr.Recv()
log.Println(data)
}
}()
// 发送数据
go func() {
for {
allStr.Send(&pb.StreamResData{Data: "from server"})
time.Sleep(time.Second)
}
}()
wg.Wait()
return nil
}
func main() {
//监听
lis, err := net.Listen("tcp", PORT)
if err != nil {
return
}
//创建一个grpc服务器
s := grpc.NewServer()
fmt.Println("服务器开始推送...")
//注册事件
pb.RegisterGreeterServer(s, &server{})
//处理链接
s.Serve(lis)
}
客户端实现
package main
import (
"context"
"log"
pb "pro01/pb"
"time"
"谷歌.golang.org/grpc"
)
const (
ADDRESS = "localhost:50051"
)
func main() {
// 通过grpc库，建立一个连接
conn, err := grpc.Dial(ADDRESS, grpc.WithInsecure())
if err != nil {
return
}
defer conn.Close()
//通过建立的连接生成一个client对象
c := pb.NewGreeterClient(conn)
//客户端服务器端 双向流
allStr, _ := c.AllStream(context.Background())
// 接收数据
go func() {
for {
data, _ := allStr.Recv()
log.Println(data)
}
}()
//发送数据
go func() {
for {
allStr.Send(&pb.StreamReqData{Data: "from client"})
time.Sleep(time.Second)
}
}()
select {}
}
运行结果
go run server/main.go
go run client/main.go
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