forked from LBRYCommunity/lbry-sdk
55 lines
1.6 KiB
Python
55 lines
1.6 KiB
Python
import struct
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import typing
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import asyncio
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import logging
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log = logging.getLogger(__name__)
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class ElasticNotifierProtocol(asyncio.Protocol):
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"""notifies the reader when ES has written updates"""
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def __init__(self, listeners):
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self._listeners = listeners
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self.transport: typing.Optional[asyncio.Transport] = None
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def connection_made(self, transport):
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self.transport = transport
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self._listeners.append(self)
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log.info("got es notifier connection")
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def connection_lost(self, exc) -> None:
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self._listeners.remove(self)
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self.transport = None
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def send_height(self, height: int, block_hash: bytes):
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log.info("notify es update '%s'", height)
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self.transport.write(struct.pack(b'>Q32s', height, block_hash))
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class ElasticNotifierClientProtocol(asyncio.Protocol):
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"""notifies the reader when ES has written updates"""
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def __init__(self, notifications: asyncio.Queue):
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self.notifications = notifications
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self.transport: typing.Optional[asyncio.Transport] = None
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def close(self):
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if self.transport and not self.transport.is_closing():
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self.transport.close()
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def connection_made(self, transport):
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self.transport = transport
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log.info("connected to es notifier")
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def connection_lost(self, exc) -> None:
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self.transport = None
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def data_received(self, data: bytes) -> None:
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try:
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height, block_hash = struct.unpack(b'>Q32s', data)
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except:
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log.exception("failed to decode %s", (data or b'').hex())
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raise
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self.notifications.put_nowait((height, block_hash))
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