上节课已经学习了gRPC基本知识，对gRPC有了初步的认识。本节课通过编程实现gRPC编程。
定义服务
我们想要实现的是通过gRPC框架进行远程服务调用，首先第一步应该是要有服务。利用之前所掌握的内容，gRPC框架支持对服务的定义和生成。gRPC框架默认使用protocol buffers作为接口定义语言，用于描述网络传输消息结构。除此之外，还可以使用protobuf定义服务接口。
syntax = "proto3";
package message;
//订单请求参数
message OrderRequest {
string orderId = 1;
int64 timeStamp = 2;
}
//订单信息
message OrderInfo {
string OrderId = 1;
string OrderName = 2;
string OrderStatus = 3;
}
//订单服务service定义
service OrderService{
rpc GetOrderInfo(OrderRequest) returns (OrderInfo);
} 我们通过proto文件定义了数据结构的同时，还定义了要实现的服务接口，GetOrderInfo即是具体服务接口的定义，在GetOrderInfo接口定义中，OrderRequest表示是请求传递的参数，OrderInfo表示处理结果返回数据参数。
编译.proto文件
环境准备
定义的proto文件需要通过编译，生成go语言代码文件，供客户端程序和服务端程序使用。可以安装go语言环境中的关于proto的插件。
go get -a github.com/golang/protobuf/protoc-gen-go
-a 参数标示下载好后直接做 go install
编译.proto文件
基本用法
可以通过基本编译命令完成对.proto文件的编译.基础编译命令如下：
protoc --go_out=. *.proto gRPC编译支持
如果定义的.proto文件，如本案例中所示，定义中包含了服务接口的定义，而我们想要使用gRPC框架实现RPC调用。开发者可以采用protocol-gen-go库提供的插件编译功能，生成兼容gRPC框架的golang语言代码。只需要在基本编译命令的基础上，指定插件的参数，告知protoc编译器即可。具体的编译生成兼容gRPC框架的服务代码的命令如下：
protoc --go_out=plugins=grpc:. *.proto gRPC实现RPC编程
服务接口实现
在.proto定义好服务接口并生成对应的go语言文件后，需要对服务接口做具体的实现。定义服务接口具体由OrderServiceImpl进行实现，并实现GetOrderInfo详细内容，服务实现逻辑与前文所述内容相同。不同点是服务接口参数的变化。详细代码实现如下：
type OrderServiceImpl struct {
}
//具体的方法实现
func (os *OrderServiceImpl) GetOrderInfo(ctx context.Context, request *message.OrderRequest) (*message.OrderInfo, error) {
orderMap := map[string]message.OrderInfo{
"201907300001": message.OrderInfo{OrderId: "201907300001", OrderName: "衣服", OrderStatus: "已付款"},
"201907310001": message.OrderInfo{OrderId: "201907310001", OrderName: "零食", OrderStatus: "已付款"},
"201907310002": message.OrderInfo{OrderId: "201907310002", OrderName: "食品", OrderStatus: "未付款"},
}
var response *message.OrderInfo
current := time.Now().Unix()
if (request.TimeStamp > current) {
*response = message.OrderInfo{OrderId: "0", OrderName: "", OrderStatus: "订单信息异常"}
} else {
result := orderMap[request.OrderId]
if result.OrderId != "" {
fmt.Println(result)
return &result, nil
} else {
return nil, errors.New("server error")
}
}
return response, nil
}
gRPC实现服务端
使用gRPC框架，首先实现服务端的程序。既然使用gRPC框架来实现，就需要调用gRPC进行服务方法的注册以及监听的处理。服务注册和监听处理实现如下：
func main() {
server := grpc.NewServer()
message.RegisterOrderServiceServer(server, new(OrderServiceImpl))
lis, err := net.Listen("tcp", ":8090")
if err != nil {
panic(err.Error())
}
server.Serve(lis)
}
gRPC实现客户端
实现完服务端以后，实现客户端程序。和服务端程序关系对应，调用gRPC框架的方法获取相应的客户端程序，并实现服务的调用，具体编程实现如下：
func main() {
//1、Dail连接
conn, err := grpc.Dial("localhost:8090", grpc.WithInsecure())
if err != nil {
panic(err.Error())
}
defer conn.Close()
orderServiceClient := message.NewOrderServiceClient(conn)
orderRequest := &message.OrderRequest{OrderId: "201907300001", TimeStamp: time.Now().Unix()}
orderInfo, err := orderServiceClient.GetOrderInfo(context.Background(), orderRequest)
if orderInfo != nil {
fmt.Println(orderInfo.GetOrderId())
fmt.Println(orderInfo.GetOrderName())
fmt.Println(orderInfo.GetOrderStatus())
}
}
运行程序
经过上述步骤后，程序及逻辑全部开发完成。程序运行，打印如下结果：
201907300001
衣服
已付款 @author：Davie版权所有
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