ssl_options['cert_reqs'] = ssl.CERT_NONE
else:
ssl_options['cert_reqs'] = ssl.CERT_REQUIRED
+
+ # Warning: If the host part of url resolves to both IPv6 and
+ # IPv4 addresses (common with "localhost"), only one of them
+ # will be attempted -- and it might not be the right one. See
+ # ws4py's WebSocketBaseClient.__init__.
super(EventClient, self).__init__(url, ssl_options=ssl_options)
self.filters = filters
self.on_event = on_event
def subscribe(api, filters, on_event, poll_fallback=15):
'''
- api: Must be a newly created from arvados.api(cache=False), not shared with the caller, as it may be used by a background thread.
+ api: a client object retrieved from arvados.api(). The caller should not use this client object for anything else after calling subscribe().
filters: Initial subscription filters.
- on_event: The callback when a message is received
+ on_event: The callback when a message is received.
poll_fallback: If websockets are not available, fall back to polling every N seconds. If poll_fallback=False, this will return None if websockets are not available.
'''
ws = None