Go基于gRPC实现客户端连入服务端

ice_moss 的个人博客 / 116 / 5 / 创建于 2年前 / 更新于 2年前 / 1 个改进

模拟一个行程数据的获取

位置结构体Location
行程状态TripStatus
行程结构体Trip
GetTripReques类型和GetTripResponse类型
定义接口TripService

一、编写.proto文件

syntax = "proto3";  //语法使用proto3
package coolcar;
option go_package = "coolcar/proto/gen/go/;trippb";  //路径和包名

//
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;  //数字表示标记码，不是赋值
    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;

}

//声明GetTripReques类型
message GetTripRequest{
    string id = 1;
}

//声明GetTripResponse类型
message GetTripResponse{
    string id = 1;
    Trip trip = 2;
}
//接口
service TripService{  
    rpc GetTrip (GetTripRequest) returns (GetTripResponse);
}

通过命令：

protoc -I=. --go_out=plugins=grpc,paths=source_relative:gen/go trip.proto

编译后主要有下面几个部分：

结构体及序列化和反序列化
注册结构体的init方法
客户端存根结构体和接口以及实现
服务端结构体和接口以及一个空实现
服务的一些描述

全部代码：

// 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"` //数字表示标记码，不是赋值
    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

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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会为我们写好客服端和服务端

二、实现接口

这里我们需要自己来实现服务端的接口

在上述文件中我们可以看到：

// TripServiceServer is the server API for TripService service.
type TripServiceServer interface {
    GetTrip(context.Context, *GetTripRequest) (*GetTripResponse, error)
}

我们需要来实现这个接口

我们在文件夹中新建“trip.go”文件来实现这个接口

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,   //客户端输入什么Id服务端就返回什么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，现在我们实现了该接口

三、服务端开端口

我们来写服务端：(在server文件夹下)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")  //监听端口
    if err != nil {  //错误处理
        log.Fatalf("监听失败: %v", err)
    }
    s := grpc.NewServer()  //创建s
    trippb.RegisterTripServiceServer(s, &trip.Service{})    //注册服务
    log.Fatal(s.Serve(list)) //s.Serve()方法不会退出

}

现在我们就可以将服务端跑起来了

四、客服端连接端口

然后我们来写客服端：

package main

import (
    "context"
    trippb "coolcar/proto/gen/go"
    "fmt"
    "log"

    "google.golang.org/grpc"
)

func main() {
  //连接grpc的服务端
    con, err := grpc.Dial("localhost:8081", grpc.WithInsecure()) //连接端口,因为安全问题我们需要调用grpc.WithInsecure()作为参数
    if err != nil {
        log.Fatalf("连接失败: %v", err)
    }
  ////创建客户端存根对象
    tsClient := trippb.NewTripServiceClient(con)   
    res, err := tsClient.GetTrip(context.Background(), &trippb.GetTripRequest{
        Id: "trips01",  //客户端输入Id
    })
    if err != nil {
        log.Fatalf("未获取到trips: %v", err)
    }
    fmt.Printf("响应结果:%v\n", res)
}

最终输出：

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}

这样我们就使用gRPC实现了一个简单的客服端通讯问题

本作品采用《CC 协议》，转载必须注明作者和本文链接

刻意学习

讨论数量: 5

Lsw_7777777

0 声望

不需要实现 mustEmbedUnimplementedTripServiceServer 方法吗?

2年前评论

ice_moss （楼主）

你说的是这个嘛？

ype UnimplementedTripServiceServer struct { } func (UnimplementedTripServiceServer) GetTrip(context.Context, GetTripRequest) (*GetTripResponse, error) { return nil, status.Errorf(codes.Unimplemented, "method GetTrip not implemented") }

go语言低手

培训班笔记啊

不是，目前在自学，对这方面的东西还不是很懂

讨论应以学习和精进为目的。请勿发布不友善或者负能量的内容，与人为善，比聪明更重要！

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Go基于gRPC实现客户端连入服务端

一、编写.proto文件

二、实现接口

三、服务端开端口

四、客服端连接端口

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Go基于gRPC实现客户端连入服务端

一、编写.proto文件

二、实现接口

三、服务端开端口

四、客服端连接端口

推荐文章：

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关于 LearnKu

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