mirror of
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76 lines
2.9 KiB
Python
76 lines
2.9 KiB
Python
import logging
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from datetime import datetime
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from threading import Thread
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from time import sleep
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import pytz
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from requests_sse import EventSource
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from core.constants import HTTP_HEADERS
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from spotproviders.spot_provider import SpotProvider
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# Spot provider using Server-Sent Events.
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class SSESpotProvider(SpotProvider):
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def __init__(self, provider_config, url):
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super().__init__(provider_config)
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self.url = url
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self.event_source = None
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self.thread = None
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self.stopped = False
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self.last_event_id = None
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def start(self):
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logging.info("Set up SSE connection to " + self.name + " spot API.")
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self.stopped = False
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self.thread = Thread(target=self.run)
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self.thread.daemon = True
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self.thread.start()
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def stop(self):
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self.stopped = True
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if self.event_source:
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self.event_source.close()
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if self.thread:
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self.thread.join()
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def _on_open(self):
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self.status = "Waiting for Data"
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def _on_error(self):
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self.status = "Connecting"
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def run(self):
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while not self.stopped:
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try:
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logging.debug("Connecting to " + self.name + " spot API...")
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self.status = "Connecting"
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with EventSource(self.url, headers=HTTP_HEADERS, latest_event_id=self.last_event_id, timeout=30,
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on_open=self._on_open, on_error=self._on_error) as event_source:
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self.event_source = event_source
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for event in self.event_source:
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if event.type == 'message':
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try:
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self.last_event_id = event.last_event_id
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new_spot = self.sse_message_to_spot(event.data)
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if new_spot:
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self.submit(new_spot)
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self.status = "OK"
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self.last_update_time = datetime.now(pytz.UTC)
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logging.debug("Received data from " + self.name + " spot API.")
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except Exception as e:
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logging.exception("Exception processing message from SSE Spot Provider (" + self.name + ")")
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except Exception as e:
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self.status = "Error"
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logging.exception("Exception in SSE Spot Provider (" + self.name + ")")
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else:
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self.status = "Disconnected"
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sleep(5) # Wait before trying to reconnect
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# Convert an SSE message received from the API into a spot. The whole message data is provided here so the subclass
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# implementations can handle the message as JSON, XML, text, whatever the API actually provides.
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def sse_message_to_spot(self, message_data):
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raise NotImplementedError("Subclasses must implement this method") |