61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
from __future__ import print_function
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import json
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import logging
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import time
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from websocket import WebSocketApp
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class Context(dict):
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"""dot.notation access to dictionary attributes"""
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__getattr__ = dict.get
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__setattr__ = dict.__setitem__
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__delattr__ = dict.__delitem__
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class CertStreamClient(WebSocketApp):
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_context = Context()
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def __init__(self, message_callback, url, skip_heartbeats=True, on_open=None, on_error=None):
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self.message_callback = message_callback
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self.skip_heartbeats = skip_heartbeats
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self.on_open_handler = on_open
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self.on_error_handler = on_error
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super(CertStreamClient, self).__init__(
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url=url,
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on_open=self._on_open,
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on_message=self._on_message,
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on_error=self._on_error,
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)
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def _on_open(self):
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certstream_logger.info("Connection established to CertStream! Listening for events...")
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if self.on_open_handler:
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self.on_open_handler()
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def _on_message(self, message):
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frame = json.loads(message)
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if frame.get('message_type', None) == "heartbeat" and self.skip_heartbeats:
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return
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self.message_callback(frame, self._context)
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def _on_error(self, ex):
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if type(ex) == KeyboardInterrupt:
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raise
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if self.on_error_handler:
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self.on_error_handler(ex)
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certstream_logger.error("Error connecting to CertStream - {} - Sleeping for a few seconds and trying again...".format(ex))
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def listen_for_events(message_callback, url, skip_heartbeats=True, setup_logger=True, on_open=None, on_error=None, **kwargs):
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try:
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while True:
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c = CertStreamClient(message_callback, url, skip_heartbeats=skip_heartbeats, on_open=on_open, on_error=on_error)
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c.run_forever(ping_interval=15, **kwargs)
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time.sleep(5)
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except KeyboardInterrupt:
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certstream_logger.info("Kill command received, exiting!!")
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certstream_logger = logging.getLogger('certstream')
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certstream_logger.setLevel(logging.INFO)
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