使用 Twisted 读取 API 响应

Question

我在使用 python Twisted 网络客户端调用 API 后尝试读取响应。我已经对传入 json 结构的端点进行了 POST 调用，然后它应该 return 带有消息（如果失败）或 json 结构的状态，如果成功。

使用下面的代码，我可以看到正在调用消息以及状态代码，但我没有看到 message/json 结构。

'BeginningPrinter' 从来没有被调用过，我不明白为什么。

输出示例：

$ python sample.py 
Response version: (b'HTTP', 1, 0)
Response code: 401 | phrase : b'UNAUTHORIZED'
Response headers:
Response length: 28

抱歉，代码太长了，但我想确保它包含我在其中运行使用的所有内容。

from io import BytesIO
import json
from twisted.internet import reactor
from twisted.web.client import Agent
from twisted.web.http_headers import Headers
from twisted.internet.defer import Deferred
from twisted.internet.protocol import Protocol
from twisted.web.client import FileBodyProducer

agent = Agent(reactor)

class BeginningPrinter(Protocol):
    def __init__(self, finished):
        self.finished = finished
        self.remaining = 1024 * 10
        print('begin')

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

    def connectionLost(self, reason):
        print('Finished receiving body:', reason.getErrorMessage())
        self.finished.callback(None)

TESTDATA = { "keySequence": "2019-07-14" }
jsonData = json.dumps(TESTDATA)
body = BytesIO(jsonData.encode('utf-8'))
body = FileBodyProducer(body)
headerDict = \
{
    'User-Agent': ['test'],
    'Content-Type': ['application/json'],
    'APIGUID' : ['ForTesting']
}
header = Headers(headerDict)

d = agent.request(b'POST', b' http://127.0.0.1:5000/receiveKeyCode', header, body)

def cbRequest(response):
    print(f'Response version: {response.version}')
    print(f'Response code: {response.code} | phrase : {response.phrase}')
    print('Response headers:')
    print('Response length:', response.length)
    print(pformat(list(response.headers.getAllRawHeaders())))
    print(response.deliverBody)
    finished = Deferred()
    response.deliverBody(BeginningPrinter(finished))
    return finished

d.addCallback(cbRequest)

def cbShutdown(ignored):
    #reactor.stop()
    pass

d.addBoth(cbShutdown)

reactor.run()

Answer 1

你不需要所有这些无意义的代码，如果你已经在使用 Flask 那么你可以写入 API 并在几行中取回值，如果你不是那么它使pip install 是有意义的，因为它让生活变得更轻松。

import json
import requests

headers = {
    'content-type': 'application/json',
    'APIGUID' : 'ForTesting'
}

conv = {"keySequence": "2019-07-14"}
s = json.dumps(conv) 
res = requests.post("http://127.0.0.1:5000/receiveKeyCode",data=s, headers=headers)
print(res.text)

参考：见this Whosebug link

使用 Twisted 读取 API 响应

Reading API response using Twisted

python

twisted