《GO语言高级编程》设计中案例，仅作为笔记进行收藏。gRPC构建在HTTP/2协议之上，因此可以将gRPC服务和普通的Web服务架设在同⼀个端⼝之上。
1.helloworld.proto
syntax = "proto3";
package main;
service Greeter {
rpc SayHello (HelloRequest) returns (HelloReply);
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
2.helloworld.pb.go
// Code generated by protoc-gen-go. DO NOT EDIT.
// source: helloworld.proto
package main
import proto "github.com/golang/protobuf/proto"
import fmt "fmt"
import math "math"
import (
context "golang.org/x/net/context"
grpc "google.golang.org/grpc"
)
// Reference imports to suppress errors if they are not otherwise used.
var _ = proto.Marshal
var _ = fmt.Errorf
var _ = math.Inf
// This is a compile-time assertion to ensure that this generated file
// is compatible with the proto package it is being compiled against.
// A compilation error at this line likely means your copy of the
// proto package needs to be updated.
const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
type HelloRequest struct {
Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *HelloRequest) Reset() { *m = HelloRequest{} }
func (m *HelloRequest) String() string { return proto.CompactTextString(m) }
func (*HelloRequest) ProtoMessage() {}
func (*HelloRequest) Descriptor() ([]byte, []int) {
return fileDescriptor_helloworld_04dfe859c9b956ba, []int{0}
}
func (m *HelloRequest) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_HelloRequest.Unmarshal(m, b)
}
func (m *HelloRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_HelloRequest.Marshal(b, m, deterministic)
}
func (dst *HelloRequest) XXX_Merge(src proto.Message) {
xxx_messageInfo_HelloRequest.Merge(dst, src)
}
func (m *HelloRequest) XXX_Size() int {
return xxx_messageInfo_HelloRequest.Size(m)
}
func (m *HelloRequest) XXX_DiscardUnknown() {
xxx_messageInfo_HelloRequest.DiscardUnknown(m)
}
var xxx_messageInfo_HelloRequest proto.InternalMessageInfo
func (m *HelloRequest) GetName() string {
if m != nil {
return m.Name
}
return ""
}
type HelloReply struct {
Message string `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *HelloReply) Reset() { *m = HelloReply{} }
func (m *HelloReply) String() string { return proto.CompactTextString(m) }
func (*HelloReply) ProtoMessage() {}
func (*HelloReply) Descriptor() ([]byte, []int) {
return fileDescriptor_helloworld_04dfe859c9b956ba, []int{1}
}
func (m *HelloReply) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_HelloReply.Unmarshal(m, b)
}
func (m *HelloReply) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_HelloReply.Marshal(b, m, deterministic)
}
func (dst *HelloReply) XXX_Merge(src proto.Message) {
xxx_messageInfo_HelloReply.Merge(dst, src)
}
func (m *HelloReply) XXX_Size() int {
return xxx_messageInfo_HelloReply.Size(m)
}
func (m *HelloReply) XXX_DiscardUnknown() {
xxx_messageInfo_HelloReply.DiscardUnknown(m)
}
var xxx_messageInfo_HelloReply proto.InternalMessageInfo
func (m *HelloReply) GetMessage() string {
if m != nil {
return m.Message
}
return ""
}
func init() {
proto.RegisterType((*HelloRequest)(nil), "main.HelloRequest")
proto.RegisterType((*HelloReply)(nil), "main.HelloReply")
}
// Reference imports to suppress errors if they are not otherwise used.
var _ context.Context
var _ grpc.ClientConn
// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
const _ = grpc.SupportPackageIsVersion4
// GreeterClient is the client API for Greeter service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type GreeterClient interface {
SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloReply, error)
}
type greeterClient struct {
cc *grpc.ClientConn
}
func NewGreeterClient(cc *grpc.ClientConn) GreeterClient {
return &greeterClient{cc}
}
func (c *greeterClient) SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloReply, error) {
out := new(HelloReply)
err := c.cc.Invoke(ctx, "/main.Greeter/SayHello", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
// GreeterServer is the server API for Greeter service.
type GreeterServer interface {
SayHello(context.Context, *HelloRequest) (*HelloReply, error)
}
func RegisterGreeterServer(s *grpc.Server, srv GreeterServer) {
s.RegisterService(&_Greeter_serviceDesc, srv)
}
func _Greeter_SayHello_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(HelloRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(GreeterServer).SayHello(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/main.Greeter/SayHello",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(GreeterServer).SayHello(ctx, req.(*HelloRequest))
}
return interceptor(ctx, in, info, handler)
}
var _Greeter_serviceDesc = grpc.ServiceDesc{
ServiceName: "main.Greeter",
HandlerType: (*GreeterServer)(nil),
Methods: []grpc.MethodDesc{
{
MethodName: "SayHello",
Handler: _Greeter_SayHello_Handler,
},
},
Streams: []grpc.StreamDesc{},
Metadata: "helloworld.proto",
}
func init() { proto.RegisterFile("helloworld.proto", fileDescriptor_helloworld_04dfe859c9b956ba) }
var fileDescriptor_helloworld_04dfe859c9b956ba = []byte{
// 142 bytes of a gzipped FileDescriptorProto
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0xc8, 0x48, 0xcd, 0xc9,
0xc9, 0x2f, 0xcf, 0x2f, 0xca, 0x49, 0xd1, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0xc9, 0x4d,
0xcc, 0xcc, 0x53, 0x52, 0xe2, 0xe2, 0xf1, 0x00, 0xc9, 0x04, 0xa5, 0x16, 0x96, 0xa6, 0x16, 0x97,
0x08, 0x09, 0x71, 0xb1, 0xe4, 0x25, 0xe6, 0xa6, 0x4a, 0x30, 0x2a, 0x30, 0x6a, 0x70, 0x06, 0x81,
0xd9, 0x4a, 0x6a, 0x5c, 0x5c, 0x50, 0x35, 0x05, 0x39, 0x95, 0x42, 0x12, 0x5c, 0xec, 0xb9, 0xa9,
0xc5, 0xc5, 0x89, 0xe9, 0x30, 0x45, 0x30, 0xae, 0x91, 0x35, 0x17, 0xbb, 0x7b, 0x51, 0x6a, 0x6a,
0x49, 0x6a, 0x91, 0x90, 0x01, 0x17, 0x47, 0x70, 0x62, 0x25, 0x58, 0x97, 0x90, 0x90, 0x1e, 0xc8,
0x26, 0x3d, 0x64, 0x6b, 0xa4, 0x04, 0x50, 0xc4, 0x0a, 0x72, 0x2a, 0x93, 0xd8, 0xc0, 0xae, 0x32,
0x06, 0x04, 0x00, 0x00, 0xff, 0xff, 0x18, 0x38, 0x13, 0xf1, 0xa9, 0x00, 0x00, 0x00,
}
3.服务器证书生成，并将证书放到 tls-config/ 文件夹下
// Makfile
default:
openssl genrsa -out server.key 2048
openssl req -new -x509 -days 3650 \
-subj "/C=GB/L=China/O=gobook/CN=server.grpc.io" \
-key server.key -out server.crt
clean:
-rm *.key *.crt *.csr *.srl
4.main.go
package main
import (
fmt "fmt"
"log"
"net/http"
"strings"
"time"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
var port = ":5000"
type myGrpcServer struct{}
func (s *myGrpcServer) SayHello(ctx context.Context, in *HelloRequest) (*HelloReply, error) {
return &HelloReply{Message: "Hello " + in.Name}, nil
}
func main() {
go startServer()
time.Sleep(time.Second)
doClientWork()
}
func startServer() {
creds, err := credentials.NewServerTLSFromFile("tls-config/server.crt", "tls-config/server.key")
if err != nil {
log.Fatal(err)
}
grpcServer := grpc.NewServer(grpc.Creds(creds))
RegisterGreeterServer(grpcServer, new(myGrpcServer))
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
fmt.Fprintln(w, "hello")
})
// gRPC是建⽴在HTTP/2版本之上，如果HTTP不是HTTP/2协议则必然⽆法提供gRPC⽀持
http.ListenAndServeTLS(port, "tls-config/server.crt", "tls-config/server.key", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// 如果将gRPC和Web服务放在⼀起，会导致gRPC和Web路径的冲突，在处理时我们需要区分两类服务。
// 每个gRPC调⽤请求的Content-Type类型会被标注为"application/grpc"类型
if r.ProtoMajor == 2 && strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
grpcServer.ServeHTTP(w, r)
} else {
mux.ServeHTTP(w, r)
}
}))
}
func doClientWork() {
creds, err := credentials.NewClientTLSFromFile("tls-config/server.crt", "server.grpc.io")
if err != nil {
log.Fatal(err)
}
conn, err := grpc.Dial("localhost"+port, grpc.WithTransportCredentials(creds))
if err != nil {
log.Fatal(err)
}
defer conn.Close()
c := NewGreeterClient(conn)
r, err := c.SayHello(context.Background(), &HelloRequest{Name: "gopher"})
if err != nil {
log.Fatalf("could not greet: %v", err)
}
log.Printf("doClientWork: %s", r.Message)
}