websocket python实现原理

""" pip install ws4py """

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()

　　下面介绍另一个比较通用的方法实现websocket：

requirements.txt

websocket_client==0.56.0
six==1.12.0

pip install --no-index --ignore-installed  --find-links=./dependency   -r   requirements.txt
pip download -d ./dependency -r requirements.txt

# coding=utf-8
import ssl
url="localhost:8016/official-website-backend/websocket?"
import wave,os
p="2019-05-06_11-42-06_8611.wav"
path=os.path.join(os.getcwd(),p)
files=wave.open(path,'rb')
data=files.readframes(1024)
print("data type is %s"%type(data))
import json
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=data
    print("发送文件type: %s"%type(data))
    ws.send(req)

if __name__ == "__main__":
    websocket.enableTrace(True)
    ws = websocket.WebSocketApp(url,
                                on_message=on_message,
                                on_error=on_error,
                                on_close=on_close)
    ws.on_open = on_open
    ws.on_message=on_message
    ws.on_error=on_error
    ws.on_close=on_close
    ws.run_forever(ping_timeout=30)