模擬一個行程資料的獲取
- 位置結構體Location
- 行程狀態TripStatus
- 行程結構體Trip
- GetTripReques型別和GetTripResponse型別
- 定義介面TripService
一、編寫.proto檔案
syntax = "proto3"; //語法使用proto3
package coolcar;
option go_package = "coolcar/proto/gen/go/;trippb"; //路徑和包名
//
message Location{
double latitude = 1;
double longitude = 2;
}
enum TripStatus{
TS_NOT_SPECIFID = 0;
NOT_STARTED = 1;
IN_PROGRESS = 2;
FINISHED = 3;
PAID = 4;
}
message Trip{
string statar = 1; //數字表示標記碼，不是賦值
Location statar_pos = 5;
repeated Location path_locations = 7;
string end = 2;
Location end_pos = 6;
int64 duration_sec = 3;
int64 fee_cent = 4;
TripStatus status = 8;
}
//宣告GetTripReques型別
message GetTripRequest{
string id = 1;
}
//宣告GetTripResponse型別
message GetTripResponse{
string id = 1;
Trip trip = 2;
}
//介面
service TripService{
rpc GetTrip (GetTripRequest) returns (GetTripResponse);
}
透過命令：
protoc -I=. --go_out=plugins=grpc,paths=source_relative:gen/go trip.proto編譯後主要有下面幾個部分：
- 結構體及序列化和反序列化
- 註冊結構體的init方法
- 客戶端存根結構體和介面以及實現
- 服務端結構體和介面以及一個空實現
- 服務的一些描述
全部程式碼：
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.13.0
// source: trip.proto
package trippb
import (
context "context"
grpc "google.golang.org/grpc"
codes "google.golang.org/grpc/codes"
status "google.golang.org/grpc/status"
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
protoimpl "google.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)
)
type TripStatus int32
const (
TripStatus_TS_NOT_SPECIFID TripStatus = 0
TripStatus_NOT_STARTED TripStatus = 1
TripStatus_IN_PROGRESS TripStatus = 2
TripStatus_FINISHED TripStatus = 3
TripStatus_PAID TripStatus = 4
)
// Enum value maps for TripStatus.
var (
TripStatus_name = map[int32]string{
0: "TS_NOT_SPECIFID",
1: "NOT_STARTED",
2: "IN_PROGRESS",
3: "FINISHED",
4: "PAID",
}
TripStatus_value = map[string]int32{
"TS_NOT_SPECIFID": 0,
"NOT_STARTED": 1,
"IN_PROGRESS": 2,
"FINISHED": 3,
"PAID": 4,
}
)
func (x TripStatus) Enum() *TripStatus {
p := new(TripStatus)
*p = x
return p
}
func (x TripStatus) String() string {
return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
}
func (TripStatus) Descriptor() protoreflect.EnumDescriptor {
return file_trip_proto_enumTypes[0].Descriptor()
}
func (TripStatus) Type() protoreflect.EnumType {
return &file_trip_proto_enumTypes[0]
}
func (x TripStatus) Number() protoreflect.EnumNumber {
return protoreflect.EnumNumber(x)
}
// Deprecated: Use TripStatus.Descriptor instead.
func (TripStatus) EnumDescriptor() ([]byte, []int) {
return file_trip_proto_rawDescGZIP(), []int{0}
}
type Location struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Latitude float64 `protobuf:"fixed64,1,opt,name=latitude,proto3" json:"latitude,omitempty"`
Longitude float64 `protobuf:"fixed64,2,opt,name=longitude,proto3" json:"longitude,omitempty"`
}
func (x *Location) Reset() {
*x = Location{}
if protoimpl.UnsafeEnabled {
mi := &file_trip_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *Location) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*Location) ProtoMessage() {}
func (x *Location) ProtoReflect() protoreflect.Message {
mi := &file_trip_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 Location.ProtoReflect.Descriptor instead.
func (*Location) Descriptor() ([]byte, []int) {
return file_trip_proto_rawDescGZIP(), []int{0}
}
func (x *Location) GetLatitude() float64 {
if x != nil {
return x.Latitude
}
return 0
}
func (x *Location) GetLongitude() float64 {
if x != nil {
return x.Longitude
}
return 0
}
type Trip struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Statar string `protobuf:"bytes,1,opt,name=statar,proto3" json:"statar,omitempty"` //數字表示標記碼，不是賦值
StatarPos *Location `protobuf:"bytes,5,opt,name=statar_pos,json=statarPos,proto3" json:"statar_pos,omitempty"`
PathLocations []*Location `protobuf:"bytes,7,rep,name=path_locations,json=pathLocations,proto3" json:"path_locations,omitempty"`
End string `protobuf:"bytes,2,opt,name=end,proto3" json:"end,omitempty"`
EndPos *Location `protobuf:"bytes,6,opt,name=end_pos,json=endPos,proto3" json:"end_pos,omitempty"`
DurationSec int64 `protobuf:"varint,3,opt,name=duration_sec,json=durationSec,proto3" json:"duration_sec,omitempty"`
FeeCent int64 `protobuf:"varint,4,opt,name=fee_cent,json=feeCent,proto3" json:"fee_cent,omitempty"`
Status TripStatus `protobuf:"varint,8,opt,name=status,proto3,enum=coolcar.TripStatus" json:"status,omitempty"`
}
func (x *Trip) Reset() {
*x = Trip{}
if protoimpl.UnsafeEnabled {
mi := &file_trip_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *Trip) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*Trip) ProtoMessage() {}
func (x *Trip) ProtoReflect() protoreflect.Message {
mi := &file_trip_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 Trip.ProtoReflect.Descriptor instead.
func (*Trip) Descriptor() ([]byte, []int) {
return file_trip_proto_rawDescGZIP(), []int{1}
}
func (x *Trip) GetStatar() string {
if x != nil {
return x.Statar
}
return ""
}
func (x *Trip) GetStatarPos() *Location {
if x != nil {
return x.StatarPos
}
return nil
}
func (x *Trip) GetPathLocations() []*Location {
if x != nil {
return x.PathLocations
}
return nil
}
func (x *Trip) GetEnd() string {
if x != nil {
return x.End
}
return ""
}
func (x *Trip) GetEndPos() *Location {
if x != nil {
return x.EndPos
}
return nil
}
func (x *Trip) GetDurationSec() int64 {
if x != nil {
return x.DurationSec
}
return 0
}
func (x *Trip) GetFeeCent() int64 {
if x != nil {
return x.FeeCent
}
return 0
}
func (x *Trip) GetStatus() TripStatus {
if x != nil {
return x.Status
}
return TripStatus_TS_NOT_SPECIFID
}
type GetTripRequest struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
}
func (x *GetTripRequest) Reset() {
*x = GetTripRequest{}
if protoimpl.UnsafeEnabled {
mi := &file_trip_proto_msgTypes[2]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *GetTripRequest) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*GetTripRequest) ProtoMessage() {}
func (x *GetTripRequest) ProtoReflect() protoreflect.Message {
mi := &file_trip_proto_msgTypes[2]
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 GetTripRequest.ProtoReflect.Descriptor instead.
func (*GetTripRequest) Descriptor() ([]byte, []int) {
return file_trip_proto_rawDescGZIP(), []int{2}
}
func (x *GetTripRequest) GetId() string {
if x != nil {
return x.Id
}
return ""
}
type GetTripResponse struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
Trip *Trip `protobuf:"bytes,2,opt,name=trip,proto3" json:"trip,omitempty"`
}
func (x *GetTripResponse) Reset() {
*x = GetTripResponse{}
if protoimpl.UnsafeEnabled {
mi := &file_trip_proto_msgTypes[3]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *GetTripResponse) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*GetTripResponse) ProtoMessage() {}
func (x *GetTripResponse) ProtoReflect() protoreflect.Message {
mi := &file_trip_proto_msgTypes[3]
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 GetTripResponse.ProtoReflect.Descriptor instead.
func (*GetTripResponse) Descriptor() ([]byte, []int) {
return file_trip_proto_rawDescGZIP(), []int{3}
}
func (x *GetTripResponse) GetId() string {
if x != nil {
return x.Id
}
return ""
}
func (x *GetTripResponse) GetTrip() *Trip {
if x != nil {
return x.Trip
}
return nil
}
var File_trip_proto protoreflect.FileDescriptor
var file_trip_proto_rawDesc = []byte{
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}
var (
file_trip_proto_rawDescOnce sync.Once
file_trip_proto_rawDescData = file_trip_proto_rawDesc
)
func file_trip_proto_rawDescGZIP() []byte {
file_trip_proto_rawDescOnce.Do(func() {
file_trip_proto_rawDescData = protoimpl.X.CompressGZIP(file_trip_proto_rawDescData)
})
return file_trip_proto_rawDescData
}
var file_trip_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
var file_trip_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
var file_trip_proto_goTypes = []interface{}{
(TripStatus)(0), // 0: coolcar.TripStatus
(*Location)(nil), // 1: coolcar.Location
(*Trip)(nil), // 2: coolcar.Trip
(*GetTripRequest)(nil), // 3: coolcar.GetTripRequest
(*GetTripResponse)(nil), // 4: coolcar.GetTripResponse
}
var file_trip_proto_depIdxs = []int32{
1, // 0: coolcar.Trip.statar_pos:type_name -> coolcar.Location
1, // 1: coolcar.Trip.path_locations:type_name -> coolcar.Location
1, // 2: coolcar.Trip.end_pos:type_name -> coolcar.Location
0, // 3: coolcar.Trip.status:type_name -> coolcar.TripStatus
2, // 4: coolcar.GetTripResponse.trip:type_name -> coolcar.Trip
3, // 5: coolcar.TripService.GetTrip:input_type -> coolcar.GetTripRequest
4, // 6: coolcar.TripService.GetTrip:output_type -> coolcar.GetTripResponse
6, // [6:7] is the sub-list for method output_type
5, // [5:6] is the sub-list for method input_type
5, // [5:5] is the sub-list for extension type_name
5, // [5:5] is the sub-list for extension extendee
0, // [0:5] is the sub-list for field type_name
}
func init() { file_trip_proto_init() }
func file_trip_proto_init() {
if File_trip_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_trip_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*Location); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_trip_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*Trip); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_trip_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*GetTripRequest); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_trip_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*GetTripResponse); 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_trip_proto_rawDesc,
NumEnums: 1,
NumMessages: 4,
NumExtensions: 0,
NumServices: 1,
},
GoTypes: file_trip_proto_goTypes,
DependencyIndexes: file_trip_proto_depIdxs,
EnumInfos: file_trip_proto_enumTypes,
MessageInfos: file_trip_proto_msgTypes,
}.Build()
File_trip_proto = out.File
file_trip_proto_rawDesc = nil
file_trip_proto_goTypes = nil
file_trip_proto_depIdxs = nil
}
// Reference imports to suppress errors if they are not otherwise used.
var _ context.Context
var _ grpc.ClientConnInterface
// 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.SupportPackageIsVersion6
// TripServiceClient is the client API for TripService service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type TripServiceClient interface {
GetTrip(ctx context.Context, in *GetTripRequest, opts ...grpc.CallOption) (*GetTripResponse, error)
}
type tripServiceClient struct {
cc grpc.ClientConnInterface
}
func NewTripServiceClient(cc grpc.ClientConnInterface) TripServiceClient {
return &tripServiceClient{cc}
}
func (c *tripServiceClient) GetTrip(ctx context.Context, in *GetTripRequest, opts ...grpc.CallOption) (*GetTripResponse, error) {
out := new(GetTripResponse)
err := c.cc.Invoke(ctx, "/coolcar.TripService/GetTrip", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
// TripServiceServer is the server API for TripService service.
type TripServiceServer interface {
GetTrip(context.Context, *GetTripRequest) (*GetTripResponse, error)
}
// UnimplementedTripServiceServer can be embedded to have forward compatible implementations.
type UnimplementedTripServiceServer struct {
}
func (*UnimplementedTripServiceServer) GetTrip(context.Context, *GetTripRequest) (*GetTripResponse, error) {
return nil, status.Errorf(codes.Unimplemented, "method GetTrip not implemented")
}
func RegisterTripServiceServer(s *grpc.Server, srv TripServiceServer) {
s.RegisterService(&_TripService_serviceDesc, srv)
}
func _TripService_GetTrip_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(GetTripRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(TripServiceServer).GetTrip(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/coolcar.TripService/GetTrip",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(TripServiceServer).GetTrip(ctx, req.(*GetTripRequest))
}
return interceptor(ctx, in, info, handler)
}
var _TripService_serviceDesc = grpc.ServiceDesc{
ServiceName: "coolcar.TripService",
HandlerType: (*TripServiceServer)(nil),
Methods: []grpc.MethodDesc{
{
MethodName: "GetTrip",
Handler: _TripService_GetTrip_Handler,
},
},
Streams: []grpc.StreamDesc{},
Metadata: "trip.proto",
}proto會為我們寫好客服端和服務端
二、實現介面
這裡我們需要自己來實現服務端的介面
在上述檔案中我們可以看到：
// TripServiceServer is the server API for TripService service.
type TripServiceServer interface {
GetTrip(context.Context, *GetTripRequest) (*GetTripResponse, error)
}我們需要來實現這個介面
我們在資料夾中新建“trip.go”檔案來實現這個介面
package trip
import (
"context"
trippb "coolcar/proto/gen/go"
)
//type TripServiceServer interface {
// GetTrip(context.Context, *GetTripRequest) (*GetTripResponse, error)
// }
type Service struct{}
func (*Service) GetTrip(con context.Context, req *trippb.GetTripRequest) (*trippb.GetTripResponse, error) {
return &trippb.GetTripResponse{
Id: req.Id, //客戶端輸入什麼Id服務端就返回什麼Id
Trip: &trippb.Trip{
Statar: "北京",
End: "上海",
DurationSec: 3600,
FeeCent: 1000,
StatarPos: &trippb.Location{
Latitude: 30,
Longitude: 120,
},
EndPos: &trippb.Location{
Latitude: 40,
Longitude: 125,
},
PathLocations: []*trippb.Location{
{
Latitude: 34,
Longitude: 123,
},
{
Latitude: 38,
Longitude: 124,
},
},
Status: trippb.TripStatus_FINISHED,
},
}, nil
}
好，現在我們實現了該介面
三、服務端開埠
我們來寫服務端：(在server資料夾下)新建”main.go”
package main
import (
trippb "coolcar/proto/gen/go"
trip "coolcar/tripservice"
"log"
"net"
"google.golang.org/grpc"
)
//service 端
func main() {
list, err := net.Listen("tcp", ":8081") //監聽埠
if err != nil { //錯誤處理
log.Fatalf("監聽失敗: %v", err)
}
s := grpc.NewServer() //建立s
trippb.RegisterTripServiceServer(s, &trip.Service{}) //註冊服務
log.Fatal(s.Serve(list)) //s.Serve()方法不會退出
}現在我們就可以將服務端跑起來了
四、客服端連線埠
然後我們來寫客服端：
package main
import (
"context"
trippb "coolcar/proto/gen/go"
"fmt"
"log"
"google.golang.org/grpc"
)
func main() {
//連線grpc的服務端
con, err := grpc.Dial("localhost:8081", grpc.WithInsecure()) //連線埠,因為安全問題我們需要呼叫grpc.WithInsecure()作為引數
if err != nil {
log.Fatalf("連線失敗: %v", err)
}
////建立客戶端存根物件
tsClient := trippb.NewTripServiceClient(con)
res, err := tsClient.GetTrip(context.Background(), &trippb.GetTripRequest{
Id: "trips01", //客戶端輸入Id
})
if err != nil {
log.Fatalf("未獲取到trips: %v", err)
}
fmt.Printf("響應結果:%v\n", res)
}
最終輸出：
id:"trips01" trip:{statar:"北京" statar_pos:{latitude:30 longitude:120} path_locations:{latitude:34 longitude:123} path_locations:{latitude:38 longitude:124} end:"上海" end_pos:{latitude:40 longitude:125} duration_sec:3600 fee_cent:1000 status:FINISHED}這樣我們就使用gRPC實現了一個簡單的客服端通訊問題
本作品採用《CC 協議》，轉載必須註明作者和本文連結