我正在Golang中构建一个与Gorilla websockets通信的网关。
我在Ubuntu 16.04上运行它，并使用.NET控制台应用程序对其进行测试。
在Windows上使用Wireshark并在Ubuntu上使用sniffit已确定消息正在从Windows客户端正确发送并由Ubuntu框接收。
但是，在我的代码中，有时在一些成功的消息之后，有时甚至没有消息之后，我的网关无法阅读消息（仍然位于_, msg, errCon := conn.ReadMessage()）
输出的一个例子是：
2018/03/27 02:38:06等待消息...... 2018/03/27 02:38:07收到的消息：main.AdminRequest {Data：“{\”SomeDataHeader \“：\”SomeData \“}”， 请求者：“user”，类型：“JustDoSomethingRequest”，Ukey：“talca”} 2018/03/27 02:38:07 { “SomeDataHeader”： “SomeData”} 2018/03/27 02:38:07等待消息......
正如我之前所说，它可能会收到一些这样的消息，但是，尽管两端的网络流量仍在继续，但不会再接收消息
我对Golang很新，并且假设我错过了一些东西。
为了简洁起见，我在下面的代码中修改了错误处理等，但这是失败代码的一个例子。
编辑根据要求，我在下面添加了Golang完整代码和C＃客户端代码（尽管如我所说，Wireshark和sniffit已经确定数据正在通过网络传输）
package main
import (
"fmt"
"net/http"
"github.com/gorilla/websocket"
"encoding/json"
"log"
)
var upgrader = websocket.Upgrader{ ReadBufferSize: 1024, WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
type AdminRequest struct {
Data string `json:"Data"`
Requestor string `json:"Requestor"`
Type string `json:"Type"`
Ukey string `json:"Ukey"`
}
func main() {
http.HandleFunc("/a", func(w http.ResponseWriter, r *http.Request) {
var conn, _ = upgrader.Upgrade(w, r, nil)
go func(conn *websocket.Conn) {
for {
_, _, err := conn.ReadMessage()
if err != nil {
log.Println("Close: "+ err.Error())
conn.Close()
return
}
}
}(conn)
go func(conn *websocket.Conn) {
for {
log.Println("Awaiting Message ...")
_, msg, errCon := conn.ReadMessage()
if errCon != nil {
log.Println("Read Error:", errCon)
break
}
log.Println("Message received: ")
var r AdminRequest
if err := json.Unmarshal(msg, &r); err != nil {
log.Println("Error: " + err.Error());
return;
}
fmt.Printf("%#v\n", r)
log.Println(r.Data);
}
}(conn)
})
http.ListenAndServe(":3000", nil)
}
C＃代码：
public class Client : IDisposable
{
private ClientWebSocket _socket;
string _address;
int _port;
public Client(string address)
{
_address = address;
_socket = new ClientWebSocket();
}
public async void SetupForReceivingStuffs()
{
while (_socket.State == WebSocketState.Open)
{
ArraySegment<byte> receivedBytes = new ArraySegment<byte>(new byte[1024]);
WebSocketReceiveResult result = await _socket.ReceiveAsync(receivedBytes, CancellationToken.None);
Console.WriteLine(Encoding.UTF8.GetString(receivedBytes.Array, 0, result.Count));
}
}
public async void SetupForSendingStuffs(ConcurrentQueue<AdminRequest> queue)
{
while (_socket.State == WebSocketState.Open)
{
AdminRequest next;
while (queue.Count > 0)
{
if (queue.TryDequeue(out next))
{
await Send(next);
}
}
await Task.Yield();
}
}
public async Task Connect()
{
while (_socket.State != WebSocketState.Open)
{
try
{
_socket = new ClientWebSocket();
await _socket.ConnectAsync(new Uri(_address), CancellationToken.None);
Console.WriteLine("Socket state: " + _socket.State);
}
catch (Exception ex)
{
//Not getting hit
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
}
}
public Task Send<TData>(TData data)
{
string text = JsonConvert.SerializeObject(data);
var encoded = Encoding.UTF8.GetBytes(text);
var buffer = new ArraySegment<Byte>(encoded, 0, encoded.Length);
return _socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
}
public void Dispose()
{
_socket.Dispose();
}
}
被叫：
class Program
{
static ConcurrentQueue<AdminRequest> _toSend;
static void Main(string[] args)
{
_toSend = new ConcurrentQueue<AdminRequest>();
Client client = new Client("ws:/(myip):(myport)/a");
client.Connect().Wait();
//client.SetupForReceivingStuffs();
client.SetupForSendingStuffs(_toSend);
WriteInstructions();
LoopAuto();
Console.WriteLine("Bye");
}
private static void LoopAuto()
{
DateTime nextMessage = DateTime.Now;
while (true)
{
if (DateTime.Now < nextMessage) continue;
Console.WriteLine("Next");
nextMessage = DateTime.Now.AddSeconds(2);
_toSend.Enqueue(new AdminRequest
{
Data = "{\"SomeDataHeader\":\"SomeData\"}",
Requestor = "user",
Type = "JustDoSomethingRequest",
Ukey = "talca"
});
}
}
private static ConsoleKeyInfo LoopManual()
{
ConsoleKeyInfo info;
do
{
info = Console.ReadKey(true);
if (info.KeyChar == '1')
{
_toSend.Enqueue(new AdminRequest
{
Data = "{\"SomeDataHeader\":\"SomeData\"}",
Requestor = "user",
Type = "JustDoSomethingRequest",
Ukey = "talca"
});
}
else if (info.KeyChar == 'i')
{
WriteInstructions();
}
} while (info.KeyChar != 'x');
return info;
}
private static void WriteInstructions()
{
Console.WriteLine("1. Send New Message");
Console.WriteLine("i. Instructions (these lines)");
Console.WriteLine("x: Exit");
}
}
答案 0 :(得分：1)
应用程序运行两个goroutine，它们循环读取消息。第一个对收到的消息没有任何作用。第二个解析并记录消息。您没有看到任何输出，因为第一个goroutine正在接收消息。
第一个goroutine似乎没有任何用途。 删除第一个goroutine来解决问题。
删除第一个goroutine也可以修复数据竞争。 Concurrent reads on a websocket connection are not supported。 race detector会报告此问题。
以下是包含其他修复和改进的更新代码。 net / http服务器 调用处理程序每个连接goroutine。使用tha goroutine而不是开始另一个goroutine。使用websocket包的JSON帮助方法。
package main
import (
"fmt"
"net/http"
"github.com/gorilla/websocket"
"encoding/json"
"log"
)
var upgrader = websocket.Upgrader{ ReadBufferSize: 1024, WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
type AdminRequest struct {
Data string `json:"Data"`
Requestor string `json:"Requestor"`
Type string `json:"Type"`
Ukey string `json:"Ukey"`
}
func wsHandler(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
defer conn.Close()
for {
var r AdminRequest
if err := conn.ReadJSON(&r); err != nil {
log.Println(err)
break
}
fmt.Printf("%#v\n", r)
log.Println(r.Data);
}
}
func main() {
http.HandleFunc("/a", wsHandler)
http.ListenAndServe(":3000", nil)
}