带Autobahn python的websocket继电器

Question

我正在尝试使用Autobahn python构建一个websocket服务器，它充当IBMWatson的文本到语音服务的中间人或中继。我已经通过使用队列从客户端接收并转发流媒体音频到Watson，并且我正在从Watson接收作为JSON数据的回写假设到我的服务器，但是我不知道如何将JSON数据转发到客户端。似乎Watson转录端回调和Autobahn客户端回调是独立存在的，我不能从一个回调调用另一个回调中的例程，也不能从一个回调访问另一个回调中的数据

我需要设置某种共享文本消息队列吗？我相信这应该很简单，但我认为问题可能是我对“self”关键字缺乏理解，它似乎将这两个例程隔离开来。如果您有任何关于了解“自我”的资料，我也将不胜感激

# For Watson
from ibm_watson import SpeechToTextV1
from ibm_watson.websocket import RecognizeCallback, AudioSource
from threading import Thread
from ibm_cloud_sdk_core.authenticators import IAMAuthenticator
# For Autobahn
from autobahn.twisted.websocket import WebSocketServerProtocol, \
    WebSocketServerFactory
from twisted.internet import reactor

try:
    from Queue import Queue, Full
except ImportError:
    from queue import Queue, Full

###############################################
#### Initalize queue to store the recordings ##
###############################################
CHUNK = 1024
BUF_MAX_SIZE = CHUNK * 10
# Buffer to store audio
q = Queue(maxsize=int(round(BUF_MAX_SIZE / CHUNK)))
# Create an instance of AudioSource
audio_source = AudioSource(q, True, True)

###############################################
#### Prepare Speech to Text Service ########
###############################################

# initialize speech to text service
authenticator = IAMAuthenticator('secretapikeycanttellyou')
speech_to_text = SpeechToTextV1(authenticator=authenticator)

# define callback for the speech to text service
class MyRecognizeCallback(RecognizeCallback):
    def __init__(self):
        RecognizeCallback.__init__(self)

    def on_transcription(self, transcript):
        print(transcript)

    def on_connected(self):
        print('Connection was successful')

    def on_error(self, error):
        print('Error received: {}'.format(error))

    def on_inactivity_timeout(self, error):
        print('Inactivity timeout: {}'.format(error))

    def on_listening(self):
        print('Service is listening')

    def on_hypothesis(self, hypothesis):
        print(hypothesis)
        #self.sendMessage(hypothesis, isBinary = false)
        # HOW TO FORWARD THIS TO CLIENT?

    def on_data(self, data):
        print(data)
        #self.sendMessage(data, isBinary = false)
        # HOW TO FORWARD THIS TO CLIENT?

    def on_close(self):
        print("Connection closed")

# define callback for client-side websocket in Autobahn
class MyServerProtocol(WebSocketServerProtocol):

    def onConnect(self, request):
        print("Client connecting: {0}".format(request.peer))

    def onOpen(self):
        print("WebSocket connection open.")
        recognize_thread = Thread(target=recognize_using_weboscket, args=())
        recognize_thread.daemon = True
        recognize_thread.start()

    def onMessage(self, payload, isBinary):
        if isBinary:
            # put audio in queue
            q.put(payload)
        else:
            print("Text message received: {0}".format(payload.decode('utf8')))

        # echo back message verbatim
        self.sendMessage(payload, isBinary)
    
    def onClose(self, wasClean, code, reason):
        print("WebSocket connection closed: {0}".format(reason))
        
## this function will initiate the recognize service and pass in the AudioSource
def recognize_using_weboscket(*args):
    mycallback = MyRecognizeCallback()
    speech_to_text.recognize_using_websocket(audio=audio_source,
                                             content_type='audio/l16; rate=16000',
                                             recognize_callback=mycallback,
                                             interim_results=True)

if __name__ == '__main__':

    factory = WebSocketServerFactory("ws://127.0.0.1:9001")
    factory.protocol = MyServerProtocol

    reactor.listenTCP(9001, factory)
    reactor.run()

看来我需要弥合MyRecognizeCallback()和MyServerProtocol()之间的差距。也请让我知道这是否是一个可怕的执行我试图完成。我知道有更简单的方法来传递websocket数据，但我想熟悉websocket API/音频流和文本消息，因为最终我想从等式中删除Watson，并使用我自己的转录算法

Answer 1

根据答案here，我试图从main调用MyServerProtocol().sendMessage(u"this is a message2".encode('utf8'))实际上是在创建一个新的、不相关的MyServerProtocol实例，而不是将消息传递到现有连接中。我能够使用here描述的方法将新消息发送到OpenWebSocket连接

这是我最后的代码，它仍然需要一些工作，但是相关的定义是broadcast_message。为了使此方法有效，还需要自己“订阅”websocketonConnect和“取消订阅”onClose：

from ibm_watson import SpeechToTextV1
from ibm_watson.websocket import RecognizeCallback, AudioSource
from threading import Thread
from ibm_cloud_sdk_core.authenticators import IAMAuthenticator
# For autobahn
import json
from autobahn.twisted.websocket import WebSocketServerProtocol, \
    WebSocketServerFactory
from twisted.internet import reactor

try:
    from Queue import Queue, Full
except ImportError:
    from queue import Queue, Full

###############################################
#### Initalize queue to store the recordings ##
###############################################
CHUNK = 1024
# Note: It will discard if the websocket client can't consumme fast enough
# So, increase the max size as per your choice
BUF_MAX_SIZE = CHUNK * 10
# Buffer to store audio
q = Queue(maxsize=int(round(BUF_MAX_SIZE / CHUNK)))
# Create an instance of AudioSource
audio_source = AudioSource(q, True, True)

###############################################
#### Prepare Speech to Text Service ########
###############################################

# initialize speech to text service
authenticator = IAMAuthenticator('secretapikey')
speech_to_text = SpeechToTextV1(authenticator=authenticator)

# define callback for the speech to text service
class MyRecognizeCallback(RecognizeCallback):
    def __init__(self):
        RecognizeCallback.__init__(self)

    def on_transcription(self, transcript):
        # Forward to client
        MyServerProtocol.broadcast_message(transcript)

    def on_connected(self):
        print('Connection was successful')

    def on_error(self, error):
        # Forward to client
        MyServerProtocol.broadcast_message('Error received: {}'.format(error))

    def on_inactivity_timeout(self, error):
        # Forward to client
        MyServerProtocol.broadcast_message('Inactivity timeout: {}'.format(error))

    def on_listening(self):
        print('Service is listening')

    def on_hypothesis(self, hypothesis):
        # Forward to client
        MyServerProtocol.broadcast_message(hypothesis)

    def on_data(self, data):
        # Forward to client
        MyServerProtocol.broadcast_message(data)

    def on_close(self):
        print("Connection closed")
        MyServerProtocol.broadcast_message("Connection closed")

class MyServerProtocol(WebSocketServerProtocol):
    connections = list()

    def onConnect(self, request):
        print("Client connecting: {0}".format(request.peer))
        self.connections.append(self)
        # Start recognizer on connection
        recognize_thread = Thread(target=recognize_using_weboscket, args=())
        recognize_thread.daemon = True
        recognize_thread.start()

    def onOpen(self):
        print("WebSocket connection open.")

    def onMessage(self, payload, isBinary):
        if isBinary:
            # Put incoming audio into the queue
            try:
                q.put(payload)
            except Full:
                pass # discard
        else:
            print("Text message received: {0}".format(payload.decode('utf8')))

    @classmethod
    def broadcast_message(cls, data):
        payload = json.dumps(data, ensure_ascii = False).encode('utf8')
        for c in set(cls.connections):
            reactor.callFromThread(cls.sendMessage, c, payload)
      

    def onClose(self, wasClean, code, reason):
        print("WebSocket connection closed: {0}".format(reason))
        self.connections.remove(self)
  
## this function will initiate the recognize service and pass in the AudioSource
def recognize_using_weboscket(*args):
    mycallback = MyRecognizeCallback()
    speech_to_text.recognize_using_websocket(audio=audio_source,
                                            content_type='audio/l16; rate=16000',
                                            recognize_callback=mycallback,
                                            interim_results=True)

if __name__ == '__main__':

factory = WebSocketServerFactory("ws://127.0.0.1:9001")
    factory.protocol = MyServerProtocol

    reactor.listenTCP(9001, factory)
    reactor.run()