grpc之protobuf常用语法速学

1，语法速学(1):返回商品”数组”、repeated修饰符

Repeated:是一个修饰符,返回字段可以重复任意多次（包括0次） 可以认为就是一个数组(切片)

服务端：

创建protobuf文件

syntax="proto3";
package services;
import "google/api/annotations.proto";

message  ProdRequest {
    int32 prod_id =1;   //传入的商品ID
}
message ProdResponse{
    int32 prod_stock=1;//商品库存
}

message QuerySize{
    int32 size = 1;//页尺寸
}

//返回 一堆商品库存，使用了repeated修饰符
message ProdResponseList{
    repeated ProdResponse prodres=1;
}

service ProdService {
    rpc GetProdStock (ProdRequest) returns (ProdResponse){
        option (google.api.http) = {
            get: "/v1/prod/{prod_id}"
        };

    }
    rpc GetProdStocks(QuerySize) returns (ProdResponseList){

    }
}

生成Prod.pb.go文件

cd pbfiles && protoc --go_out=plugins=grpc:../services  Prod.proto

创建ProdSerbice.go文件

package services

import (
    "context"
)

type ProdService struct {

}

func(this *ProdService) GetProdStock(ctx context.Context, request *ProdRequest) (*ProdResponse, error) {

      return &ProdResponse{ProdStock:20},nil
}

func (this *ProdService) GetProdStocks(ctx context.Context,size *QuerySize) (*ProdResponseList, error){
    var Prodres []*ProdResponse
    Prodres = make([]*ProdResponse,0,3)
    Prodres = append(Prodres,&ProdResponse{ProdStock:28,})
    Prodres = append(Prodres,&ProdResponse{ProdStock:29,})
    Prodres = append(Prodres,&ProdResponse{ProdStock:30,})
    return &ProdResponseList{
        Prodres:Prodres,
    },nil
}

server.go

package main

import (
    "google.golang.org/grpc"
    "grpcpro/services"
    "net"
)

func main()  {
    rpcServer:=grpc.NewServer()
    services.RegisterProdServiceServer(rpcServer,new(services.ProdService))

    lis,_:=net.Listen("tcp",":8081")

    rpcServer.Serve(lis)


}

启动服务

go run server.go

客户端：

拷贝服务端的生成的文件Prod.pb.go到客户端目录下

mian.go

package main

import (
    "context"
    "fmt"
    "google.golang.org/grpc"
    "gprccli/services"
    "log"
)

func main(){

    conn,err:=grpc.Dial(":8081",grpc.WithInsecure())
    if err!=nil{
        log.Fatal(err)
    }
    defer conn.Close()

    prodClient:=services.NewProdServiceClient(conn)
    ctx:=context.Background()

    //prodRes,err:=prodClient.GetProdStock(context.Background(),
    //    &services.ProdRequest{ProdId:12})
    //if err!=nil{
    //    log.Fatal(err)
    //}
    //fmt.Println(prodRes.ProdStock)

    response,err := prodClient.GetProdStocks(ctx,&services.QuerySize{Size:10})

    if err!=nil{
        log.Fatal(err)
    }
    fmt.Println(response.Prodres[2].ProdStock)
}

启动客户端client 调用服务端gprc服务

go run main.go

2，语法速学(2): 使用枚举、获取分区商品库存

　　1、传入一个商品ID 获取一个商品库存。

　　2、根据size获取一堆商品的库存列表

　　3，创建枚举类型，支持分区枚举参数

enum ProdAreas{
    A=0;
    B=1;
    C=2;
}

ProdService.go

package services

import (
    "context"
)

type ProdService struct {}

func(this *ProdService) GetProdStock(ctx context.Context, request *ProdRequest) (*ProdResponse, error) {

      var stock int32=0
      if request.ProdArea==ProdAreas_A{
          stock=30
      }else if request.ProdArea==ProdAreas_B{
          stock=31
      }else{
          stock=50
      }
      return &ProdResponse{ProdStock:stock},nil
}
func(this *ProdService) GetProdStocks(ctx context.Context,size *QuerySize) (*ProdResponseList, error)  {
            Prodres:= []*ProdResponse{
                    &ProdResponse{ProdStock:28},
                    &ProdResponse{ProdStock:29},
                    &ProdResponse{ProdStock:30},
                    &ProdResponse{ProdStock:31},
            }
            return &ProdResponseList{
                Prodres:Prodres,
            },nil
}

语法速学(3): 导入外部Proto、获取商品信息

服务端：

Models.proto

syntax="proto3";
package services;
message ProdModel{ //商品模型
    int32 prod_id=1;
    string prod_name=2;
    float prod_price=3;
}

Prod.proto

syntax="proto3";
package services;


import "google/api/annotations.proto";
import "Models.proto";

enum ProdAreas{
    A=0;
    B=1;
    C=2;
}

message  ProdRequest {
    int32 prod_id =1;   //传入的商品ID
}
message ProdResponse{
    int32 prod_stock=1;//商品库存
}

message QuerySize{
    int32 size = 1;//页尺寸
}

//返回 一堆商品库存，使用了repeated修饰符
message ProdResponseList{
    repeated ProdResponse prodres=1;
}

service ProdService {
    rpc GetProdStock (ProdRequest) returns (ProdResponse){
        option (google.api.http) = {
            get: "/v1/prod/{prod_id}"
        };

    }
    rpc GetProdStocks(QuerySize) returns (ProdResponseList){

    }

    rpc GetProdInfo(ProdRequest) returns(ProdModel){}
}

生成pb.go文件

protoc --go_out=plugins=grpc:../services  Prod.proto

protoc --go_out=plugins=grpc:../services  Models.proto

ProdService.go

package services

import (
    "context"
)

type ProdService struct {

}

func(this *ProdService) GetProdStock(ctx context.Context, request *ProdRequest) (*ProdResponse, error) {

      return &ProdResponse{ProdStock:20},nil
}

func (this *ProdService) GetProdStocks(ctx context.Context,size *QuerySize) (*ProdResponseList, error){
    var Prodres []*ProdResponse
    Prodres = make([]*ProdResponse,0,3)
    Prodres = append(Prodres,&ProdResponse{ProdStock:28,})
    Prodres = append(Prodres,&ProdResponse{ProdStock:29,})
    Prodres = append(Prodres,&ProdResponse{ProdStock:30,})
    return &ProdResponseList{
        Prodres:Prodres,
    },nil
}

func (this *ProdService) GetProdInfo(ctx context.Context, in *ProdRequest) (*ProdModel, error){

    ret:=ProdModel{
        ProdId:101,
        ProdName:"测试商品",
        ProdPrice:20.5,
    }
    return &ret,nil
}

客户端：

拷贝服务端 Models.pb.go和Prod.pb.go到客户端下

package main

import (
    "context"
    "fmt"
    "google.golang.org/grpc"
    "gprccli/services"
    "log"
)

func main(){

    conn,err:=grpc.Dial(":8081",grpc.WithInsecure())
    if err!=nil{
        log.Fatal(err)
    }
    defer conn.Close()

    prodClient:=services.NewProdServiceClient(conn)
    ctx:=context.Background()

    //prodRes,err:=prodClient.GetProdStock(context.Background(),
    //    &services.ProdRequest{ProdId:12})
    //if err!=nil{
    //    log.Fatal(err)
    //}
    //fmt.Println(prodRes.ProdStock)

    //response,err := prodClient.GetProdStocks(ctx,&services.QuerySize{Size:10})
    //
    //if err!=nil{
    //    log.Fatal(err)
    //}
    //fmt.Println(response.Prodres[2].ProdStock)

    prod,err :=prodClient.GetProdInfo(ctx,&services.ProdRequest{ProdId:12})
    if err!=nil{
        log.Fatal(err)
    }
    fmt.Println(prod)
}

语法学习日期类型、创建主订单模型(下)

服务端：

Models.proto

syntax="proto3";
package services;

import "google/protobuf/timestamp.proto";

message ProdModel{ //商品模型
    int32 prod_id=1;
    string prod_name=2;
    float prod_price=3;
}


message OrderMain{ //主订单模型
      int32 order_id=1;//订单ID，数字自增
      string order_no=2; //订单号
      int32 user_id=3; //购买者ID
      float order_money=4;//商品金额
      google.protobuf.Timestamp order_time=5; //下单时间
}

Orders.proto

syntax="proto3";
package services;

import "Models.proto";

message OrderResponse{
    string status=1;
    string message=2;
}
service OrderSerivce{
    rpc NewOrder(OrderMain) returns (OrderResponse){}
}

$ protoc --go_out=plugins=grpc:../services Models.proto

$ protoc --go_out=plugins=grpc:../services Orders.proto

生成pb.go文件

OrdersService.go

package services

import (
    "context"
    "fmt"
)

type OrdersService struct {

}

func(this *OrdersService)NewOrder(ctx context.Context,orderMain *OrderMain) (*OrderResponse, error)   {
    fmt.Println(orderMain)
    return &OrderResponse{
        Status:"OK",
        Message:"success",
    },nil
}

server.go

func main()  {
    rpcServer:=grpc.NewServer()
    services.RegisterProdServiceServer(rpcServer,new(services.ProdService))
    services.RegisterOrderSerivceServer(rpcServer,new(services.OrdersService))

    lis,_:=net.Listen("tcp",":8081")

    rpcServer.Serve(lis)


}

客户端：

首先拷贝Orders.pb.go和Models.pb.go到客户端

package main

import (
    "context"
    "fmt"
    "github.com/golang/protobuf/ptypes/timestamp"
    "google.golang.org/grpc"
    "gprccli/services"
    "log"
    "time"
)

func main2(){

    conn,err:=grpc.Dial(":8081",grpc.WithInsecure())
    if err!=nil{
        log.Fatal(err)
    }
    defer conn.Close()

    prodClient:=services.NewProdServiceClient(conn)
    ctx:=context.Background()

    //prodRes,err:=prodClient.GetProdStock(context.Background(),
    //    &services.ProdRequest{ProdId:12})
    //if err!=nil{
    //    log.Fatal(err)
    //}
    //fmt.Println(prodRes.ProdStock)

    //response,err := prodClient.GetProdStocks(ctx,&services.QuerySize{Size:10})
    //
    //if err!=nil{
    //    log.Fatal(err)
    //}
    //fmt.Println(response.Prodres[2].ProdStock)

    prod,err :=prodClient.GetProdInfo(ctx,&services.ProdRequest{ProdId:12})
    if err!=nil{
        log.Fatal(err)
    }
    fmt.Println(prod)
}

func main(){
    conn,err:=grpc.Dial(":8081",grpc.WithInsecure())
    if err!=nil{
        log.Fatal(err)
    }
    defer conn.Close()
    ctx:=context.Background()
    t:=timestamp.Timestamp{Seconds:time.Now().Unix()}
    orderClient:=services.NewOrderSerivceClient(conn)
    res,_:= orderClient.NewOrder(ctx,&services.OrderMain{
        OrderId:1001,
        OrderNo:"20190809",
        OrderMoney:90,
        OrderTime:&t,
    })
    fmt.Println(res)
}