Ballerina:回调时出现多个websocket错误

我用ballerina编程了一个代理服务器。此代理通过websocket接收客户的请求。目标是Ballerina服务器收集此请求并将其发送到名为“提取器”的服务器。此服务器处理请求并将响应返回给Ballerina服务器。此时，Ballerina服务器不会将响应返回给发出请求的客户端，而是将“提取器”的响应发送给另一个名为“提取器2”的服务器，该服务器将处理“提取器”的响应。稍后，“提取器2”将处理后的信息返回给Ballerina的服务器，而这个服务器将其返回给在第一个实例中发出请求的客户机。芭蕾舞演员、客户端、提取器和提取器2之间的所有通信都是通过WebSocket完成的。问题在于，当提取器2试图将信息返回到Ballerina的服务器时，它发现无法返回，因为通信已关闭

这是我的代码：

import ballerina/http;
import ballerina/log;


final string ASSOCIATED_CONNECTION = "EXTRACTOR CONNECTION";
final string EXTRACTOR = "ws://localhost:9090/basic";
final string EXTRACTOR2 = "ws://localhost:9091/basic";



@http:WebSocketServiceConfig {
    path: "/api/ws"
}

service RequestService on new http:Listener(9092) {

  resource function onOpen(http:WebSocketCaller caller) {

        http:WebSocketClient wsClientEp = new(
            EXTRACTOR,
            {callbackService: ClientService1,
            readyOnConnect: false,
            maxFrameSize: 2147483648
        });
        http:WebSocketClient wsClientEp2 = new(
            EXTRACTOR2,
            {callbackService: ClientService2,
            readyOnConnect: false,
            maxFrameSize: 2147483648
        });

        caller.setAttribute(ASSOCIATED_CONNECTION, wsClientEp);
        wsClientEp.setAttribute(ASSOCIATED_CONNECTION, wsClientEp2);
        wsClientEp2.setAttribute(ASSOCIATED_CONNECTION, caller);

        var err = wsClientEp->ready();
        if (err is http:WebSocketError) {
            log:printError("Error calling ready on client 1", err);
        }

        err = wsClientEp2->ready();
        if (err is http:WebSocketError) {
            log:printError("Error calling ready on client 2", err);
        }
    }

    resource function onText(http:WebSocketCaller caller, string text, boolean finalFrame) {

        http:WebSocketClient clientEp = getAssociatedClientEndpoint(caller);
        var err = clientEp->pushText(text, finalFrame);
        if (err is http:WebSocketError) {
            log:printError("Error occurred when sending text message", err);
        }
    }


    resource function onError(http:WebSocketCaller caller, error err) {

       http:WebSocketClient clientEp = getAssociatedClientEndpoint(caller);
       var e = clientEp->close(statusCode = 1011, reason = "Unexpected condition");
       if (e is http:WebSocketError) {
           log:printError("Error occurred when closing the connection", e);
       }
       _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
       log:printError("Unexpected error hence closing the connection", err);
   }

   resource function onClose(http:WebSocketCaller caller, int statusCode, string reason) {

       http:WebSocketClient clientEp = getAssociatedClientEndpoint(caller);
       var err = clientEp->close(statusCode = statusCode, reason = reason);
       if (err is http:WebSocketError) {
           log:printError("Error occurred when closing the connection", err);
       }
       _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
   }
}

service ClientService1 = @http:WebSocketServiceConfig {} service {

    resource function onText(http:WebSocketClient caller, string text, boolean finalFrame) {
        http:WebSocketClient clientEp2 = getAssociatedClientEndpointFromClient(caller);
        var err = clientEp2->pushText(text, finalFrame);
        if (err is http:WebSocketError) {
            log:printError("Error occurred when sending text message", err);
        }
    }

    resource function onError(http:WebSocketClient caller, error err) {
        http:WebSocketClient clientEp2 = getAssociatedClientEndpointFromClient(caller);
        var e = clientEp2->close(statusCode = 1011, reason = "Unexpected condition");
        if (e is http:WebSocketError) {
            log:printError("Error occurred when closing the connection", err = e);
        }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
        log:printError("Unexpected error hense closing the connection", err);
    }

    resource function onClose(http:WebSocketClient caller, int statusCode, string reason) {
        http:WebSocketClient clientEp2 = getAssociatedClientEndpointFromClient(caller);
        var err = clientEp2->close(statusCode = statusCode, reason = reason);
            if (err is http:WebSocketError) {
                log:printError("Error occurred when closing the connection", err);
            }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
    }
};

service ClientService2 = @http:WebSocketServiceConfig {} service {

    resource function onText(http:WebSocketClient caller, string text, boolean finalFrame) {
        http:WebSocketCaller serverEp = getAssociatedServerEndpoint(caller);
        var err = serverEp->pushText(text, finalFrame);
        if (err is http:WebSocketError) {
            log:printError("Error occurred when sending text message", err);
        }
    }

    resource function onError(http:WebSocketClient caller, error err) {
        http:WebSocketCaller serverEp = getAssociatedServerEndpoint(caller);
        var e = serverEp->close(statusCode = 1011, reason = "Unexpected condition");
        if (e is http:WebSocketError) {
            log:printError("Error occurred when closing the connection", err = e);
        }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
        log:printError("Unexpected error hense closing the connection", err);
    }

    resource function onClose(http:WebSocketClient caller, int statusCode, string reason) {
        http:WebSocketCaller serverEp = getAssociatedServerEndpoint(caller);
        var err = serverEp->close(statusCode = statusCode, reason = reason);
            if (err is http:WebSocketError) {
                log:printError("Error occurred when closing the connection", err);
            }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
    }
};

function getAssociatedClientEndpoint(http:WebSocketCaller ep) returns (http:WebSocketClient) {
    http:WebSocketClient wsClient = <http:WebSocketClient>ep.getAttribute(ASSOCIATED_CONNECTION);
    return wsClient;
}

function getAssociatedServerEndpoint(http:WebSocketClient ep) returns (http:WebSocketCaller) {
    http:WebSocketCaller wsEndpoint = <http:WebSocketCaller>ep.getAttribute(ASSOCIATED_CONNECTION);
    return wsEndpoint;
}

function getAssociatedClientEndpointFromClient(http:WebSocketClient ep) returns (http:WebSocketClient) {
    http:WebSocketClient wsEndpoint = <http:WebSocketClient>ep.getAttribute(ASSOCIATED_CONNECTION);
    return wsEndpoint;
}

---

我使用了以下芭蕾舞演员代理：

import ballerina/http;
import ballerina/log;


final string ASSOCIATED_CONNECTION = "EXTRACTOR CONNECTION";
final string EXTRACTOR = "ws://localhost:9091/basic";
final string EXTRACTOR2 = "ws://localhost:8082";



@http:WebSocketServiceConfig {
    path: "/api/ws"
}

service RequestService on new http:Listener(9092) {

  resource function onOpen(http:WebSocketCaller caller) {

        http:WebSocketClient wsClientEp = new(
            EXTRACTOR,
            {callbackService: ClientService1,
            readyOnConnect: false,
            maxFrameSize: 2147483648
        });
        http:WebSocketClient wsClientEp2 = new(
            EXTRACTOR2,
            {callbackService: ClientService2,
            readyOnConnect: false,
            maxFrameSize: 2147483648
        });

        caller.setAttribute(ASSOCIATED_CONNECTION, wsClientEp);
        wsClientEp.setAttribute(ASSOCIATED_CONNECTION, wsClientEp2);
        wsClientEp2.setAttribute(ASSOCIATED_CONNECTION, caller);

        var err = wsClientEp->ready();
        if (err is http:WebSocketError) {
            log:printError("Error calling ready on client 1", err);
        }

        err = wsClientEp2->ready();
        if (err is http:WebSocketError) {
            log:printError("Error calling ready on client 2", err);
        }
    }

    resource function onText(http:WebSocketCaller caller, string text, boolean finalFrame) {

        http:WebSocketClient clientEp = getAssociatedClientEndpoint(caller);
        var err = clientEp->pushText(text, finalFrame);
        if (err is http:WebSocketError) {
            log:printError("Error occurred when sending text message", err);
        }
    }


    resource function onError(http:WebSocketCaller caller, error err) {

       http:WebSocketClient clientEp = getAssociatedClientEndpoint(caller);
       var e = clientEp->close(statusCode = 1011, reason = "Unexpected condition");
       if (e is http:WebSocketError) {
           log:printError("Error occurred when closing the connection", e);
       }
       _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
       log:printError("Unexpected error hence closing the connection", err);
   }

   resource function onClose(http:WebSocketCaller caller, int statusCode, string reason) {

       http:WebSocketClient clientEp = getAssociatedClientEndpoint(caller);
       var err = clientEp->close(statusCode = statusCode, reason = reason);
       if (err is http:WebSocketError) {
           log:printError("Error occurred when closing the connection", err);
       }
       _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
   }
}

service ClientService1 = @http:WebSocketServiceConfig {} service {

    resource function onText(http:WebSocketClient caller, string text, boolean finalFrame) {
        http:WebSocketClient clientEp2 = getAssociatedClientEndpointFromClient(caller);
        var err = clientEp2->pushText(text, finalFrame);
        if (err is http:WebSocketError) {
            log:printError("Error occurred when sending text message", err);
        }
    }

    resource function onError(http:WebSocketClient caller, error err) {
        http:WebSocketClient clientEp2 = getAssociatedClientEndpointFromClient(caller);
        var e = clientEp2->close(statusCode = 1011, reason = "Unexpected condition");
        if (e is http:WebSocketError) {
            log:printError("Error occurred when closing the connection", err = e);
        }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
        log:printError("Unexpected error hense closing the connection", err);
    }

    resource function onClose(http:WebSocketClient caller, int statusCode, string reason) {
        http:WebSocketClient clientEp2 = getAssociatedClientEndpointFromClient(caller);
        var err = clientEp2->close(statusCode = statusCode, reason = reason);
            if (err is http:WebSocketError) {
                log:printError("Error occurred when closing the connection", err);
            }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
    }
};

service ClientService2 = @http:WebSocketServiceConfig {} service {

    resource function onText(http:WebSocketClient caller, string text, boolean finalFrame) {
        http:WebSocketCaller serverEp = getAssociatedServerEndpoint(caller);
        var err = serverEp->pushText(text, finalFrame);
        if (err is http:WebSocketError) {
            log:printError("Error occurred when sending text message", err);
        }
    }

    resource function onError(http:WebSocketClient caller, error err) {
        http:WebSocketCaller serverEp = getAssociatedServerEndpoint(caller);
        var e = serverEp->close(statusCode = 1011, reason = "Unexpected condition");
        if (e is http:WebSocketError) {
            log:printError("Error occurred when closing the connection", err = e);
        }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
        log:printError("Unexpected error hense closing the connection", err);
    }

    resource function onClose(http:WebSocketClient caller, int statusCode, string reason) {
        http:WebSocketCaller serverEp = getAssociatedServerEndpoint(caller);
        var err = serverEp->close(statusCode = statusCode, reason = reason);
            if (err is http:WebSocketError) {
                log:printError("Error occurred when closing the connection", err);
            }
        _ = caller.removeAttribute(ASSOCIATED_CONNECTION);
    }
};

function getAssociatedClientEndpoint(http:WebSocketCaller ep) returns (http:WebSocketClient) {
    http:WebSocketClient wsClient = <http:WebSocketClient>ep.getAttribute(ASSOCIATED_CONNECTION);
    return wsClient;
}

function getAssociatedServerEndpoint(http:WebSocketClient ep) returns (http:WebSocketCaller) {
    http:WebSocketCaller wsEndpoint = <http:WebSocketCaller>ep.getAttribute(ASSOCIATED_CONNECTION);
    return wsEndpoint;
}

function getAssociatedClientEndpointFromClient(http:WebSocketClient ep) returns (http:WebSocketClient) {
    http:WebSocketClient wsEndpoint = <http:WebSocketClient>ep.getAttribute(ASSOCIATED_CONNECTION);
    return wsEndpoint;
}

---

这些对我来说很好。

您也可以分享python服务器代码吗？我想知道是什么导致异常关闭。如果有ballerina日志，您也可以通过运行

ballerina run balFile.jar--b7a.log.console.loglevel=WARN

来共享它吗？我已经添加了它。

import json
import asyncio
import websockets

print("Ready")

async def server(websocket, path):

    try:

        request_json = await websocket.recv()

        print("Peticion recibida")

        data = ["hello"]

        response = {"ok": 1, "data": data}

        print(response)

        await websocket.send(json.dumps(response))

    except BaseException as exception:

        print("Exception found")

        response = {"ok": 0, "data": "[ANALYZER] " + str(type(exception)) + str(exception)}

        print(json.dumps(response))

        await websocket.send(json.dumps(response))

    finally:

        print("Finished")

start_server = websockets.serve(server, "0.0.0.0", 8082)

asyncio.get_event_loop().run_until_complete(start_server)

asyncio.get_event_loop().run_forever()