我有一个python flask应用程序,它从json接收数据。我还使用了socketio和线程来实时处理数据。在我的程序中,我需要将从json请求接收的数据发送到另一个python函数。下面是我为此编写的代码:-
from flask_socketio import SocketIO, emit
from flask import Flask, render_template, request, url_for, copy_current_request_context
from random import random
from time import sleep
from pygeodesy.ellipsoidalVincenty import LatLon
from threading import Thread, Event
__author__ = 'shark'
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
app.config['DEBUG'] = True
# turn the flask app into a socketio app
socketio = SocketIO(app, async_mode=None, logger=True, engineio_logger=True)
# random number Generator Thread
thread = Thread()
thread_stop_event = Event()
@app.route('/platform-data', methods=['POST'])
def platformData():
"""
Generate a random number every 1 second and emit to a socketio instance (broadcast)
Ideally to be run in a separate thread?
"""
# infinite loop of magical random numbers
print("Receiving platform data")
while not thread_stop_event.isSet():
req_data = request.get_json()
id = req_data['id']
latitude = req_data['coordinates'][1]
longitude = req_data['coordinates'][0]
speed = req_data['speed']
angle = req_data['angle']
length = req_data['dimensions'][0]
width = req_data['dimensions'][1]
laneW = req_data['lane_width']
spdLmt = req_data['speed_limit']
return testProcess(speed)
def testProcess(speed):
if speed>30:
print("slow down")
socketio.emit('speed', {'speed': speed}, namespace='/test')
socketio.sleep(.5)
@app.route('/')
def index():
# only by sending this page first will the client be connected to the socketio instance
return render_template('index.html')
@socketio.on('connect', namespace='/test')
def test_connect():
# need visibility of the global thread object
global thread
print('Client connected')
# Start the random number generator thread only if the thread has not been started before.
if not thread.isAlive():
print("Starting Thread")
thread = socketio.start_background_task(platformData)
@socketio.on('disconnect', namespace='/test')
def test_disconnect():
print('Client disconnected')
if __name__ == '__main__':
socketio.run(app)
但是,当我运行应用程序并从Postman中发布POST数据时,在控制台中出现以下错误:-
TypeError:视图函数未返回有效响应。的返回类型必须是字符串,字典,元组,响应实例或WSGI可以调用,但这是一个int。127.0.0.1--[05 / Mar / 2020 17:06:25]“ POST / platform-data HTTP / 1.1” 500 15625 0.008975
我知道原因是我已经声明了return testProcess(speed)
。
因此,我需要知道将速度变量传递给'testProcess'函数的正确方法。
platformData()必须返回字符串,字典,元组,Response实例或可调用的WSGI,但是您返回未定义的testProcess的返回值尝试:
def testProcess(speed):
if speed>30:
return "slow down"
else:
return "ok"
或仅调用testProcess(speed)而不返回然后返回其他内容