详解python websocket获取实时数据的几种常见链接方式

时间:2021-05-22

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 timefrom websocket import create_connectionurl = '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) continuewhile 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 jsonfrom ws4py.client.threadedclient import WebSocketClientclass 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 websocketwhile True: ws = websocket.WebSocket() try: ws.connect("wss://i.cg.net/wi/ws") print(ws) break except Exception as e: print('异常:', e) continueprint('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 websocketdef 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)

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

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