gRPC伺服器重新部署後重連如何處理？

重新部署後如何連接到 gRPC 伺服器

在 gRPC 中，clientconn.go 程式碼自動管理重新連線。但是，如果伺服器 Pod 被回收，則串流將中斷並需要重新建立。要解決此問題，請按照以下步驟操作：

處理請求

func (grpcclient *gRPCClient) ProcessRequests() error {
    defer grpcclient.Close()    

    go grpcclient.process()
    for {
        select {
            case <-grpcclient.reconnect:
                if !grpcclient.waitUntilReady() {
                    return errors.New("failed to establish a connection within the defined timeout")
                }
                go grpcclient.process()
            case <-grpcclient.done:
                return nil
        }
    }
}

處理請求：

func (grpcclient *gRPCClient) process() {
    reqclient := GetStream() // Get a new stream after reconnecting
    for {
        request, err := reqclient.stream.Recv()
        log.Info("Request received")
        if err == io.EOF {          
            grpcclient.done <- true
            return
        }
        if err != nil {
            grpcclient.reconnect <- true
            return
        } else {
            // Process requests
        }
    }
}

檢查連線State

func (grpcclient *gRPCClient) waitUntilReady() bool {
    ctx, cancel := context.WithTimeout(context.Background(), 300*time.Second) // Define the timeout for waiting
    defer cancel()

    currentState := grpcclient.conn.GetState()
    stillConnecting := true

    for currentState != connectivity.Ready && stillConnecting {
        // Wait for state change
        stillConnecting = grpcclient.conn.WaitForStateChange(ctx, currentState)
        currentState = grpcclient.conn.GetState()
        log.WithFields(log.Fields{"state: ": currentState, "timeout": timeoutDuration}).Info("Attempting reconnection. State has changed to:")
    }

    if stillConnecting == false {
        log.Error("Connection attempt has timed out.")
        return false
    }

    return true
}

這些修改將允許 gRPC 用戶端在伺服器重新部署後自動重新建立流並繼續處理請求。

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