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问题:
I am trying to connect to wss://api.poloniex.com and subscribe to ticker. I can't find any working example in python. I have tried to use autobahn/twisted and websocket-client 0.32.0.
The purpose of this is to get real time ticker data and store it in a mysql database.
So far I have tried to use examples provided in library documentation. They work for localhost or the test server but if I change to wss://api.poloniex.com I get a bunch of errors.
here is my attempt using websocket-client 0.32.0:
from websocket import create_connection ws = create_connection("wss://api.poloniex.com") ws.send("ticker") result = ws.recv() print "Received '%s'" % result ws.close()
and this is using autobahn/twisted:
from autobahn.twisted.websocket import WebSocketClientProtocol from autobahn.twisted.websocket import WebSocketClientFactory class MyClientProtocol(WebSocketClientProtocol): def onConnect(self, response): print("Server connected: {0}".format(response.peer)) def onOpen(self): print("WebSocket connection open.") def hello(): self.sendMessage(u"ticker".encode('utf8')) self.sendMessage(b"\x00\x01\x03\x04", isBinary=True) self.factory.reactor.callLater(1, hello) # start sending messages every second .. hello() def onMessage(self, payload, isBinary): if isBinary: print("Binary message received: {0} bytes".format(len(payload))) else: print("Text message received: {0}".format(payload.decode('utf8'))) def onClose(self, wasClean, code, reason): print("WebSocket connection closed: {0}".format(reason)) if __name__ == '__main__': import sys from twisted.python import log from twisted.internet import reactor log.startLogging(sys.stdout) factory = WebSocketClientFactory("wss://api.poloniex.com", debug=False) factory.protocol = MyClientProtocol reactor.connectTCP("wss://api.poloniex.com", 9000, factory) reactor.run()
A complete but simple example showing how to connect and subscribe to to a websocket push api using any python library would be greatly appreciated.
回答1:
What you are trying to accomplish can be done by using WAMP, specifically by using the WAMP modules of the autobahn library (that you are already trying to use).
After following their docs, I managed to set-up a simple example using autobahn and asyncio. The following example subscribes to the 'ticker' feed and prints the received values:
from autobahn.asyncio.wamp import ApplicationSession from autobahn.asyncio.wamp import ApplicationRunner from asyncio import coroutine class PoloniexComponent(ApplicationSession): def onConnect(self): self.join(self.config.realm) @coroutine def onJoin(self, details): def onTicker(*args): print("Ticker event received:", args) try: yield from self.subscribe(onTicker, 'ticker') except Exception as e: print("Could not subscribe to topic:", e) def main(): runner = ApplicationRunner("wss://api.poloniex.com:443", "realm1") runner.run(PoloniexComponent) if __name__ == "__main__": main()
You can find more details about WAMP programming with autobahn here: http://autobahn.ws/python/wamp/programming.html
回答2:
This uses the undocumented websocket endpoint because Poloniex has pulled support for the original WAMP socket endpoint.
import websocket import thread import time import json def on_message(ws, message): print(message) def on_error(ws, error): print(error) def on_close(ws): print("### closed ###") def on_open(ws): print("ONOPEN") def run(*args): ws.send(json.dumps({'command':'subscribe','channel':1001})) ws.send(json.dumps({'command':'subscribe','channel':1002})) ws.send(json.dumps({'command':'subscribe','channel':1003})) ws.send(json.dumps({'command':'subscribe','channel':'BTC_XMR'})) while True: time.sleep(1) ws.close() print("thread terminating...") thread.start_new_thread(run, ()) if __name__ == "__main__": websocket.enableTrace(True) ws = websocket.WebSocketApp("wss://api2.poloniex.com/", on_message = on_message, on_error = on_error, on_close = on_close) ws.on_open = on_open ws.run_forever()
The channels are:
1001 = trollbox (you will get nothing but a heartbeat) 1002 = ticker 1003 = base coin 24h volume stats 1010 = heartbeat 'MARKET_PAIR' = market order books
回答3:
Meanwhile poloniex changed the ticker API, so now it returns a symbol-id instead of a name, so maybe someone will find this useful:
7: BTC_BCN 8: BTC_BELA 10: BTC_BLK 12: BTC_BTCD 13: BTC_BTM 14: BTC_BTS 15: BTC_BURST 20: BTC_CLAM 24: BTC_DASH 25: BTC_DGB 27: BTC_DOGE 28: BTC_EMC2 31: BTC_FLDC 32: BTC_FLO 38: BTC_GAME 40: BTC_GRC 43: BTC_HUC 50: BTC_LTC 51: BTC_MAID 58: BTC_OMNI 61: BTC_NAV 63: BTC_NEOS 64: BTC_NMC 69: BTC_NXT 73: BTC_PINK 74: BTC_POT 75: BTC_PPC 83: BTC_RIC 89: BTC_STR 92: BTC_SYS 97: BTC_VIA 98: BTC_XVC 99: BTC_VRC 100: BTC_VTC 104: BTC_XBC 108: BTC_XCP 112: BTC_XEM 114: BTC_XMR 116: BTC_XPM 117: BTC_XRP 121: USDT_BTC 122: USDT_DASH 123: USDT_LTC 124: USDT_NXT 125: USDT_STR 126: USDT_XMR 127: USDT_XRP 129: XMR_BCN 130: XMR_BLK 131: XMR_BTCD 132: XMR_DASH 137: XMR_LTC 138: XMR_MAID 140: XMR_NXT 148: BTC_ETH 149: USDT_ETH 150: BTC_SC 151: BTC_BCY 153: BTC_EXP 155: BTC_FCT 158: BTC_RADS 160: BTC_AMP 162: BTC_DCR 163: BTC_LSK 166: ETH_LSK 167: BTC_LBC 168: BTC_STEEM 169: ETH_STEEM 170: BTC_SBD 171: BTC_ETC 172: ETH_ETC 173: USDT_ETC 174: BTC_REP 175: USDT_REP 176: ETH_REP 177: BTC_ARDR 178: BTC_ZEC 179: ETH_ZEC 180: USDT_ZEC 181: XMR_ZEC 182: BTC_STRAT 183: BTC_NXC 184: BTC_PASC 185: BTC_GNT 186: ETH_GNT 187: BTC_GNO 188: ETH_GNO 189: BTC_BCH 190: ETH_BCH 191: USDT_BCH 192: BTC_ZRX 193: ETH_ZRX 194: BTC_CVC 195: ETH_CVC 196: BTC_OMG 197: ETH_OMG 198: BTC_GAS 199: ETH_GAS 200: BTC_STORJ
回答4:
Currently, Twisted doesn't properly use the Windows trust store. So the verification of the TLS certificate will fail. To work around this until either Twisted or Autobahn includes a workaround, you can:
- install
certifi module (pip install certifi) - set SSL_CERT_FILE, like
export SSL_CERT_FILE="$(python -m certifi)"
