Question

我正在编写一个websocket客户端，每隔几秒左右就会收到更新，利用扭曲的高速公路。我使用多个观察者成功记录数据，但是我想使用我收到的部分消息发送到数据帧（并最终实时绘图）。我的假设是我可以记录变量以及类似文件的对象，但我无法弄清楚如何做到这一点。实现这一目标的正确方法是什么。

我已经非常彻底地阅读了当前和传统扭曲记录器的文档：

twisted.log https://twistedmatrix.com/documents/current/core/howto/logging.html
twisted.logger https://twistedmatrix.com/documents/current/core/howto/logger.html

在我的代码中，我尝试使用新的twisted.logger包中引用的zope.interface和@provider来创建自定义日志观察器，但到目前为止，即使获得自定义日志观察器进行打印也没有运气，让单独甚至将数据发送到变量。

from twisted.internet import reactor
from autobahn.twisted.websocket import WebSocketClientFactory, WebSocketClientProtocol, connectWS
from twisted.logger import (globalLogBeginner, Logger, globalLogPublisher,
  jsonFileLogObserver, ILogObserver)

import sys
import io
import json

from pandas import DataFrame

def loggit(message):
    log.info("Echo: {message!r}", message=message)



class ClientProtocol(WebSocketClientProtocol):
    def onConnect(self, response):
        print("Server connected: {0}".format(response.peer))

    def initMessage(self):
        message_data = {}
        message_json = json.dumps(message_data)
        print "sendMessage: " + message_json
        self.sendMessage(message_json)

    def onOpen(self):
        print "onOpen calls initMessage()"
        self.initMessage()

    def onMessage(self, msg, binary, df):
        loggit(msg)


    def onClose(self, wasClean, code, reason):
        print("WebSocket connection closed: {0}".format(reason))


if __name__ == '__main__':

    factory = WebSocketClientFactory("wss://ws-feed.whatever.com")
    factory.protocol = ClientProtocol

    @provider(ILogObserver)
    def customObserver(whatgoeshere?):
        print event

    observers = [jsonFileLogObserver(io.open("loga.json", "a")),
     jsonFileLogObserver(io.open("logb.json", "a")), customObserver(Whatgoeshere?)]

    log = Logger()

    globalLogBeginner.beginLoggingTo(observers)



    connectWS(factory)
    reactor.run()

Answer 1

日志观察者只是一个可调用对象，它接受包含日志消息中所有值的字典。

这意味着您可以拥有一个类的实例，其中__call__方法使用@zope.interface.implementer(ILogObserver)修饰，或者使用@zope.interface.provider(ILogObserver)修饰的函数，可以执行该角色。

这是一些代码的示例，它将一些值记录到文本文件，JSON文件和内存中的统计信息收集器中，这些收集器可以实时汇总。

import io
from zope.interface import implementer
from twisted.logger import (globalLogBeginner, Logger, jsonFileLogObserver,
                            ILogObserver, textFileLogObserver)

class Something(object):
    log = Logger()

    def doSomething(self, value):
        self.log.info("Doing something to {value}",
                      value=value)

@implementer(ILogObserver)
class RealTimeStatistics(object):
    def __init__(self):
        self.stats = []

    def __call__(self, event):
        if 'value' in event:
            self.stats.append(event['value'])

    def reportCurrent(self):
        print("Current Sum Is: " + repr(sum(self.stats)))

if __name__ == "__main__":
    stats = RealTimeStatistics()
    globalLogBeginner.beginLoggingTo([
        jsonFileLogObserver(io.open("log1.json", "ab")),
        textFileLogObserver(io.open("log2.txt", "ab")),
        stats, # here we pass our log observer
    ], redirectStandardIO=False)
    something = Something()
    something.doSomething(1)
    something.doSomething(2)
    something.doSomething(3)
    stats.reportCurrent()

如何在Twisted / Autobahn

1 个答案: