使用golang语言和grpc框架,实现一个设备连接功能。设备与server为双向流连接,设备连接到server之后,会保持连接状态。期间server可以主动给client发送指令,client也可以主动给server回报数据
时间: 2024-02-21 10:00:24 浏览: 28
好的,您的问题是如何使用golang语言和grpc框架实现设备连接功能,并保持双向流连接状态,期间可以实现主动发送指令和回报数据。
首先,我们需要定义一个gRPC服务,用于设备连接和数据通信,具体定义如下:
```protobuf
syntax = "proto3";
package device;
service DeviceService {
rpc Connect(stream DeviceRequest) returns (stream DeviceResponse) {}
}
message DeviceRequest {
string device_id = 1;
bytes data = 2;
}
message DeviceResponse {
bytes data = 1;
}
```
接着,我们可以使用gRPC框架生成golang代码,具体命令如下:
```
protoc -I=. device.proto --go_out=plugins=grpc:.
```
生成的代码中包含了服务端和客户端的代码,我们可以针对这些代码进行开发。
服务端代码实现如下:
```go
package main
import (
"context"
"io"
"log"
"net"
pb "device"
"google.golang.org/grpc"
)
type deviceServer struct{}
func (s *deviceServer) Connect(stream pb.DeviceService_ConnectServer) error {
deviceID := ""
for {
req, err := stream.Recv()
if err == io.EOF {
log.Printf("Device %s disconnected", deviceID)
return nil
}
if err != nil {
log.Printf("Error receiving from device %s: %v", deviceID, err)
return err
}
if deviceID == "" {
deviceID = req.DeviceId
log.Printf("Device %s connected", deviceID)
}
log.Printf("Received data from device %s: %v", deviceID, req.Data)
// Send response back to device
if err := stream.Send(&pb.DeviceResponse{
Data: []byte("Response from server"),
}); err != nil {
log.Printf("Error sending response to device %s: %v", deviceID, err)
return err
}
}
}
func main() {
lis, err := net.Listen("tcp", ":8888")
if err != nil {
log.Fatalf("Failed to listen: %v", err)
}
s := grpc.NewServer()
pb.RegisterDeviceServiceServer(s, &deviceServer{})
log.Printf("Server started, listening on %v", lis.Addr())
if err := s.Serve(lis); err != nil {
log.Fatalf("Failed to serve: %v", err)
}
}
```
客户端代码实现如下:
```go
package main
import (
"context"
"io"
"log"
"time"
pb "device"
"google.golang.org/grpc"
)
func main() {
conn, err := grpc.Dial("localhost:8888", grpc.WithInsecure())
if err != nil {
log.Fatalf("Failed to connect: %v", err)
}
defer conn.Close()
client := pb.NewDeviceServiceClient(conn)
stream, err := client.Connect(context.Background())
if err != nil {
log.Fatalf("Failed to connect: %v", err)
}
defer stream.CloseSend()
go func() {
for {
// Send data to server
if err := stream.Send(&pb.DeviceRequest{
DeviceId: "device1",
Data: []byte("Data from device1"),
}); err != nil {
log.Printf("Error sending data to server: %v", err)
}
time.Sleep(time.Second)
}
}()
for {
// Receive response from server
res, err := stream.Recv()
if err == io.EOF {
log.Println("Server closed the stream")
return
}
if err != nil {
log.Printf("Error receiving response from server: %v", err)
return
}
log.Printf("Received response from server: %v", res.Data)
}
}
```
客户端代码中使用了一个goroutine来不断向服务端发送数据,服务端在接收到数据后,会向客户端回复一条固定的消息。客户端在接收到服务端的回复后,会将回复内容输出到日志中。
以上就是使用golang语言和grpc框架实现设备连接功能的示例代码。
相关推荐
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)