twisted 在客户端获取响应数据

Question

我关注了这个tutorial，但我不知道如何从服务器获取响应数据。

class Service(Resource):
    def render_POST(self, request):
        return 'response message'

我知道响应数据会显示在客户端

 def dataReceived(self, bytes):
        if self.remaining:
            display = bytes[:self.remaining]
            print 'Some data received:'
            print display
            self.remaining -= len(display)

如何从服务器获取返回的消息并将其存储到变量中？

Answer 1

只需让dataReceived 将display 存储在一个实例变量中，并在每次调用dataReceived 时附加到它。然后，一旦调用了connectionLost，你就知道你得到了完整的响应。

class BeginningPrinter(Protocol):
    def __init__(self, finished):
        self.finished = finished
        self.remaining = 1024 * 10
        self.total_response = ""  # This will store the response.

    def dataReceived(self, bytes):
        if self.remaining:
            display = bytes[:self.remaining]
            self.total_response += display  # Append to our response.
            self.remaining -= len(display)

    def connectionLost(self, reason):
        print 'Finished receiving body:', reason.getErrorMessage()
        print 'response is ',self.total_response
        self.finished.callback(self.total_response)

在完整示例的上下文中：

from pprint import pformat

from twisted.internet import reactor
from twisted.internet.defer import Deferred
from twisted.internet.protocol import Protocol
from twisted.web.client import Agent
from twisted.web.http_headers import Headers

class BeginningPrinter(Protocol):
    def __init__(self, finished):
        self.finished = finished
        self.remaining = 1024 * 10
        self.total_response = ""  # This will store the response.

    def dataReceived(self, bytes):
        if self.remaining:
            display = bytes[:self.remaining]
            self.total_response += display  # Append to our response.
            self.remaining -= len(display)

    def connectionLost(self, reason):
        print 'Finished receiving body:', reason.getErrorMessage()
        print 'response is ',self.total_response
        self.finished.callback(self.total_response)  # Executes all registered callbacks

def handle_result(response):
    print("Got response {}".format(response)

agent = Agent(reactor)
d = agent.request(
    'GET',
    'http://example.com/',
    Headers({'User-Agent': ['Twisted Web Client Example']}),
    None)

def cbRequest(response):
    print 'Response version:', response.version
    print 'Response code:', response.code
    print 'Response phrase:', response.phrase
    print 'Response headers:'
    print pformat(list(response.headers.getAllRawHeaders()))
    finished = Deferred()
    finished.addCallback(handle_result)  # handle_result will be called when the response is ready
    response.deliverBody(BeginningPrinter(finished))
    return finished
d.addCallback(cbRequest)

def cbShutdown(ignored):
    reactor.stop()
d.addBoth(cbShutdown)

reactor.run()