Question

我正在设置一个Websocket服务器，它登录到另一台服务器，并通过套接字将数据推送到网页（通过订阅功能）。只要我从websocket运行的文件中继续调用广播函数，一切都很好。但是从我的push-function打印到命令行的另一个python文件中调用broadcast方法，没有客户端收到消息。

我假设，从另一个文件调用广播会创建另一个实例，并且self.clients为空。总而言之，连接的客户端从loginGESI()获取广播，但不在scrptCallbackHandlerExample(subType)的第二个文件中。

对任何帮助都会感到高兴！

这是我的Websocket文件：

class BroadcastServerProtocol(WebSocketServerProtocol):

    def onOpen(self):
        self.factory.register(self)

    def connectionLost(self, reason):
        WebSocketServerProtocol.connectionLost(self, reason)
        self.factory.unregister(self)

class BroadcastServerFactory(WebSocketServerFactory):
    clients = []

    def __init__(self, url):
        WebSocketServerFactory.__init__(self, url)

    def register(self, client):
        if client not in self.clients:
            print("registered client {}".format(client.peer))
            self.clients.append(client)

    def unregister(self, client):
        if client in self.clients:
            print("unregistered client {}".format(client.peer))
            self.clients.remove(client)

    @classmethod
    def broadcast(self, msg):
        print("broadcasting message '{}' ..".format(msg))
        print(self.clients)
        for c in self.clients:
            c.sendMessage(msg.encode('utf8'))
            print("message sent to {}".format(c.peer))

def login():
    codesys = Test_Client("FTS_test")
    result = codesys.login()
    # FTS = codesys.searchForPackage("F000012")
    FTS = ["15900"];
    scrptContextId = [None] * len(FTS)
    itemContextIds_array = [None] * len(FTS)
    for i in range(0,len(FTS)):
        result, scrptContextId[i] = codesys.createSubscription(c_ScrptCallbackHandlerExample, 100, int(FTS[i]))
        print("SubscriptionRoomId: "+str(scrptContextId[i]))
        result, itemContextIds_array[i], diagInfo = codesys.attachToSubscription(1, [FTS[i]+'.speed'], [100])
        print("Subscription done for: "+str(itemContextIds_array[i]))
        print("Subscription for: Speed")

    BroadcastServerFactory.broadcast(str(FTS[0]))


if __name__ == '__main__':

    # Logger Websocket
    log.startLogging(sys.stdout)
    # factory initialisieren
    ServerFactory = BroadcastServerFactory
    factory = ServerFactory("ws://127.0.0.1:9000")
    factory.protocol = BroadcastServerProtocol
    listenWS(factory)
    # reactor initialisieren
    webdir = File(".")
    web = Site(webdir)
    reactor.listenTCP(8080, web)

    reactor.callLater(5, login)

    reactor.run()

这里是我的订阅文件：

# Launch of the CallbackHandler named in the createSubscription function 
# CallbackHandler describes what happens to a variable which changes its value
def scrptCallbackHandlerExample(subType):
    BroadcastServerFactory.broadcast('test')

    # Saves the value of the variables(s) in an array
    dataValue = []
    for i in range(0,subType.size):
        dataValue.append(subType.dataItems[i].node.dataValue)

    # Print variabel informations on the screen
    print "*****Callback - Data Change in a Variable*****"
    print( 'Subscription ID: %d' % subType.subscrId )
    for idx in range(0,subType.size):
        print( '** Item %d **' % idx )
        print( 'Item Id: %d' % subType.dataItems[idx].dataItemId )
        print( 'Item Node ID: %s' % subType.dataItems[idx].node.nodeId )
        print( 'Item data value: %s' % subType.dataItems[idx].node.dataValue )
        print( 'Item data type: %s' % subType.dataItems[idx].node.dataType )
        print( '******************************' )
# Define the type of the function as an eSubscriptionType
CB_FUNC_TYPE = CFUNCTYPE( None,  eSubscriptionType)
c_ScrptCallbackHandlerExample = CB_FUNC_TYPE( scrptCallbackHandlerExample )

此致

Answer 1

在我看来，我找到了一个非常巧妙的解决方法。

每当调用我的订阅函数时，我将本地客户端连接到我的websocket服务器并向他发送带有新值的消息，然后websocket服务器将其推送到其他客户端。由于我仍然在努力，我不能发布任何代码但是给出了功能。因此，如果有人对解决方案感兴趣，请告诉我，我可以发布我的。

Twisted Websocket - 当从另一个文件调用时，广播不起作用

1 个答案: