详解python websocket获取实时数据的几种常见链接方式


						第一种, 使用create_connection链接，需要pip install websocket-client (此方法不建议使用，链接不稳定，容易断，并且连接很耗时)







import time

from websocket import create_connection



url = 'wss://i.cg.net/wi/ws'

while True: # 一直链接，直到连接上就退出循环

  time.sleep(2)

  try:

    ws = create_connection(url)

    print(ws)

    break

  except Exception as e:

    print('连接异常：', e)

    continue

while True: # 连接上，退出第一个循环之后，此循环用于一直获取数据

  ws.send('{"event":"subscribe", "channel":"btc_usdt.ticker"}')

  response = ws.recv()

  print(response)



第二种,运行效果很不错，很容易连接，获取数据的速度也挺快







import json

from ws4py.client.threadedclient import WebSocketClient





class CG_Client(WebSocketClient):



  def opened(self):

    req = '{"event":"subscribe", "channel":"eth_usdt.deep"}'

    self.send(req)



  def closed(self, code, reason=None):

    print("Closed down:", code, reason)



  def received_message(self, resp):

    resp = json.loads(str(resp))

    data = resp['data']

    if type(data) is dict:

      ask = data['asks'][0]

      print('Ask:', ask)

      bid = data['bids'][0]

      print('Bid:', bid)





if __name__ == '__main__':

  ws = None

  try:

    ws = CG_Client('wss://i.cg.net/wi/ws')

    ws.connect()

    ws.run_forever()

  except KeyboardInterrupt:

    ws.close()



第三种，其实和第一种差不多，只不过换种写法而已，运行效果不理想，连接耗时，并且容易断







import websocket



while True:

  ws = websocket.WebSocket()

  try:

    ws.connect("wss://i.cg.net/wi/ws")

    print(ws)

    break

  except Exception as e:

    print('异常：', e)

    continue

print('OK')

while True:

  req = '{"event":"subscribe", "channel":"btc_usdt.deep"}'

  ws.send(req)

  resp = ws.recv()

  print(resp)



第四种，运行效果也可以，run_forever里面有许多参数，需要自己设置







import websocket





def on_message(ws, message): # 服务器有数据更新时，主动推送过来的数据

  print(message)





def on_error(ws, error): # 程序报错时，就会触发on_error事件

  print(error)





def on_close(ws):

  print("Connection closed ……")





def on_open(ws): # 连接到服务器之后就会触发on_open事件，这里用于send数据

  req = '{"event":"subscribe", "channel":"btc_usdt.deep"}'

  print(req)

  ws.send(req)





if __name__ == "__main__":

  websocket.enableTrace(True)

  ws = websocket.WebSocketApp("wss://i.cg.net/wi/ws",

                on_message=on_message,

                on_error=on_error,

                on_close=on_close)

  ws.on_open = on_open

  ws.run_forever(ping_timeout=30)



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