318 lines
14 KiB
Python
318 lines
14 KiB
Python
import os
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import time
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import signal
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import json
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import typing
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from collections import defaultdict
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import asyncio
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import logging
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from elasticsearch import AsyncElasticsearch, NotFoundError
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from elasticsearch.helpers import async_streaming_bulk
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from lbry.schema.result import Censor
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from lbry.wallet.server.db.elasticsearch.search import IndexVersionMismatch
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from lbry.wallet.server.db.elasticsearch.constants import ALL_FIELDS, INDEX_DEFAULT_SETTINGS
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from lbry.wallet.server.db.elasticsearch.common import expand_query
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from lbry.wallet.server.db.elasticsearch.notifier import ElasticNotifierProtocol
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from lbry.wallet.server.db.elasticsearch.fast_ar_trending import FAST_AR_TRENDING_SCRIPT
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from lbry.wallet.server.chain_reader import BlockchainReader
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from lbry.wallet.server.db.revertable import RevertableOp
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from lbry.wallet.server.db import DB_PREFIXES
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log = logging.getLogger()
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class ElasticWriter(BlockchainReader):
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VERSION = 1
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def __init__(self, env):
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super().__init__(env, 'lbry-elastic-writer', thread_workers=1, thread_prefix='lbry-elastic-writer')
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# self._refresh_interval = 0.1
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self._task = None
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self.index = self.env.es_index_prefix + 'claims'
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self._elastic_host = env.elastic_host
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self._elastic_port = env.elastic_port
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self.sync_timeout = 1800
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self.sync_client = AsyncElasticsearch(
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[{'host': self._elastic_host, 'port': self._elastic_port}], timeout=self.sync_timeout
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)
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self._es_info_path = os.path.join(env.db_dir, 'es_info')
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self._last_wrote_height = 0
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self._last_wrote_block_hash = None
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self._touched_claims = set()
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self._deleted_claims = set()
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self._removed_during_undo = set()
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self._trending = defaultdict(list)
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self._advanced = True
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self.synchronized = asyncio.Event()
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self._listeners: typing.List[ElasticNotifierProtocol] = []
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async def run_es_notifier(self, synchronized: asyncio.Event):
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server = await asyncio.get_event_loop().create_server(
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lambda: ElasticNotifierProtocol(self._listeners), '127.0.0.1', self.env.elastic_notifier_port
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)
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self.log.info("ES notifier server listening on TCP localhost:%i", self.env.elastic_notifier_port)
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synchronized.set()
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async with server:
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await server.serve_forever()
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def notify_es_notification_listeners(self, height: int, block_hash: bytes):
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for p in self._listeners:
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p.send_height(height, block_hash)
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self.log.info("notify listener %i", height)
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def _read_es_height(self):
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with open(self._es_info_path, 'r') as f:
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info = json.loads(f.read())
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self._last_wrote_height = int(info.get('height', 0))
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self._last_wrote_block_hash = info.get('block_hash', None)
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async def read_es_height(self):
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await asyncio.get_event_loop().run_in_executor(self._executor, self._read_es_height)
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def write_es_height(self, height: int, block_hash: str):
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with open(self._es_info_path, 'w') as f:
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f.write(json.dumps({'height': height, 'block_hash': block_hash}, indent=2))
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self._last_wrote_height = height
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self._last_wrote_block_hash = block_hash
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async def get_index_version(self) -> int:
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try:
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template = await self.sync_client.indices.get_template(self.index)
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return template[self.index]['version']
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except NotFoundError:
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return 0
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async def set_index_version(self, version):
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await self.sync_client.indices.put_template(
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self.index, body={'version': version, 'index_patterns': ['ignored']}, ignore=400
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)
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async def start_index(self) -> bool:
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if self.sync_client:
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return False
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hosts = [{'host': self._elastic_host, 'port': self._elastic_port}]
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self.sync_client = AsyncElasticsearch(hosts, timeout=self.sync_timeout)
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while True:
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try:
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await self.sync_client.cluster.health(wait_for_status='yellow')
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break
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except ConnectionError:
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self.log.warning("Failed to connect to Elasticsearch. Waiting for it!")
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await asyncio.sleep(1)
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res = await self.sync_client.indices.create(self.index, INDEX_DEFAULT_SETTINGS, ignore=400)
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acked = res.get('acknowledged', False)
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if acked:
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await self.set_index_version(self.VERSION)
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return acked
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index_version = await self.get_index_version()
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if index_version != self.VERSION:
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self.log.error("es search index has an incompatible version: %s vs %s", index_version, self.VERSION)
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raise IndexVersionMismatch(index_version, self.VERSION)
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await self.sync_client.indices.refresh(self.index)
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return acked
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async def stop_index(self):
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if self.sync_client:
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await self.sync_client.close()
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self.sync_client = None
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def delete_index(self):
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return self.sync_client.indices.delete(self.index, ignore_unavailable=True)
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def update_filter_query(self, censor_type, blockdict, channels=False):
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blockdict = {blocked.hex(): blocker.hex() for blocked, blocker in blockdict.items()}
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if channels:
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update = expand_query(channel_id__in=list(blockdict.keys()), censor_type=f"<{censor_type}")
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else:
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update = expand_query(claim_id__in=list(blockdict.keys()), censor_type=f"<{censor_type}")
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key = 'channel_id' if channels else 'claim_id'
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update['script'] = {
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"source": f"ctx._source.censor_type={censor_type}; "
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f"ctx._source.censoring_channel_id=params[ctx._source.{key}];",
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"lang": "painless",
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"params": blockdict
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}
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return update
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async def apply_filters(self, blocked_streams, blocked_channels, filtered_streams, filtered_channels):
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if filtered_streams:
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await self.sync_client.update_by_query(
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self.index, body=self.update_filter_query(Censor.SEARCH, filtered_streams), slices=4)
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await self.sync_client.indices.refresh(self.index)
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if filtered_channels:
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await self.sync_client.update_by_query(
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self.index, body=self.update_filter_query(Censor.SEARCH, filtered_channels), slices=4)
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await self.sync_client.indices.refresh(self.index)
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await self.sync_client.update_by_query(
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self.index, body=self.update_filter_query(Censor.SEARCH, filtered_channels, True), slices=4)
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await self.sync_client.indices.refresh(self.index)
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if blocked_streams:
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await self.sync_client.update_by_query(
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self.index, body=self.update_filter_query(Censor.RESOLVE, blocked_streams), slices=4)
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await self.sync_client.indices.refresh(self.index)
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if blocked_channels:
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await self.sync_client.update_by_query(
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self.index, body=self.update_filter_query(Censor.RESOLVE, blocked_channels), slices=4)
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await self.sync_client.indices.refresh(self.index)
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await self.sync_client.update_by_query(
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self.index, body=self.update_filter_query(Censor.RESOLVE, blocked_channels, True), slices=4)
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await self.sync_client.indices.refresh(self.index)
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async def _claim_producer(self):
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for deleted in self._deleted_claims:
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yield {
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'_index': self.index,
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'_op_type': 'delete',
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'_id': deleted.hex()
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}
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for touched in self._touched_claims:
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claim = self.db.claim_producer(touched)
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if claim:
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yield {
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'doc': {key: value for key, value in claim.items() if key in ALL_FIELDS},
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'_id': claim['claim_id'],
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'_index': self.index,
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'_op_type': 'update',
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'doc_as_upsert': True
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}
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for claim_hash, notifications in self._trending.items():
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yield {
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'_id': claim_hash.hex(),
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'_index': self.index,
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'_op_type': 'update',
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'script': {
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'lang': 'painless',
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'source': FAST_AR_TRENDING_SCRIPT,
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'params': {'src': {
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'changes': [
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{
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'height': notify_height,
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'prev_amount': trending_v.previous_amount / 1E8,
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'new_amount': trending_v.new_amount / 1E8,
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} for (notify_height, trending_v) in notifications
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]
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}}
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},
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}
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def advance(self, height: int):
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super().advance(height)
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touched_or_deleted = self.db.prefix_db.touched_or_deleted.get(height)
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for k, v in self.db.prefix_db.trending_notification.iterate((height,)):
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self._trending[k.claim_hash].append((k.height, v))
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if touched_or_deleted:
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readded_after_reorg = self._removed_during_undo.intersection(touched_or_deleted.touched_claims)
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self._deleted_claims.difference_update(readded_after_reorg)
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self._touched_claims.update(touched_or_deleted.touched_claims)
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self._deleted_claims.update(touched_or_deleted.deleted_claims)
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self._touched_claims.difference_update(self._deleted_claims)
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for to_del in touched_or_deleted.deleted_claims:
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if to_del in self._trending:
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self._trending.pop(to_del)
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self.log.info("advanced to %i, %i touched %i to delete (%i %i)", height, len(touched_or_deleted.touched_claims), len(touched_or_deleted.deleted_claims),
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len(self._touched_claims), len(self._deleted_claims))
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self._advanced = True
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def unwind(self):
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self.db.tx_counts.pop()
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reverted_block_hash = self.db.coin.header_hash(self.db.headers.pop())
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packed = self.db.prefix_db.undo.get(len(self.db.tx_counts), reverted_block_hash)
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touched_or_deleted = None
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claims_to_delete = []
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# find and apply the touched_or_deleted items in the undos for the reverted blocks
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assert packed, f'missing undo information for block {len(self.db.tx_counts)}'
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while packed:
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op, packed = RevertableOp.unpack(packed)
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if op.is_delete and op.key.startswith(DB_PREFIXES.touched_or_deleted.value):
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assert touched_or_deleted is None, 'only should have one match'
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touched_or_deleted = self.db.prefix_db.touched_or_deleted.unpack_value(op.value)
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elif op.is_delete and op.key.startswith(DB_PREFIXES.claim_to_txo.value):
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v = self.db.prefix_db.claim_to_txo.unpack_value(op.value)
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if v.root_tx_num == v.tx_num and v.root_tx_num > self.db.tx_counts[-1]:
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claims_to_delete.append(self.db.prefix_db.claim_to_txo.unpack_key(op.key).claim_hash)
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if touched_or_deleted:
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self._touched_claims.update(set(touched_or_deleted.deleted_claims).union(
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touched_or_deleted.touched_claims.difference(set(claims_to_delete))))
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self._deleted_claims.update(claims_to_delete)
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self._removed_during_undo.update(claims_to_delete)
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self._advanced = True
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self.log.warning("delete %i claim and upsert %i from reorg", len(self._deleted_claims), len(self._touched_claims))
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async def poll_for_changes(self):
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await super().poll_for_changes()
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cnt = 0
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success = 0
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if self._advanced:
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if self._touched_claims or self._deleted_claims or self._trending:
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async for ok, item in async_streaming_bulk(
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self.sync_client, self._claim_producer(),
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raise_on_error=False):
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cnt += 1
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if not ok:
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self.log.warning("indexing failed for an item: %s", item)
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else:
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success += 1
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await self.sync_client.indices.refresh(self.index)
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self.write_es_height(self.db.db_height, self.db.db_tip[::-1].hex())
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self.log.info("Indexing block %i done. %i/%i successful", self._last_wrote_height, success, cnt)
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self._touched_claims.clear()
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self._deleted_claims.clear()
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self._removed_during_undo.clear()
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self._trending.clear()
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self._advanced = False
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self.synchronized.set()
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self.notify_es_notification_listeners(self._last_wrote_height, self.db.db_tip)
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@property
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def last_synced_height(self) -> int:
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return self._last_wrote_height
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async def start(self):
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env = self.env
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min_str, max_str = env.coin.SESSIONCLS.protocol_min_max_strings()
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def _start_cancellable(run, *args):
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_flag = asyncio.Event()
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self.cancellable_tasks.append(asyncio.ensure_future(run(*args, _flag)))
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return _flag.wait()
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self.db.open_db()
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await self.db.initialize_caches()
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await self.start_index()
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self.last_state = self.db.read_db_state()
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await _start_cancellable(self.run_es_notifier)
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await _start_cancellable(self.refresh_blocks_forever)
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async def stop(self, delete_index=False):
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async with self._lock:
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while self.cancellable_tasks:
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t = self.cancellable_tasks.pop()
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if not t.done():
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t.cancel()
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if delete_index:
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await self.delete_index()
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await self.stop_index()
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self._executor.shutdown(wait=True)
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def run(self):
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loop = asyncio.get_event_loop()
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def __exit():
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raise SystemExit()
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try:
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loop.add_signal_handler(signal.SIGINT, __exit)
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loop.add_signal_handler(signal.SIGTERM, __exit)
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loop.run_until_complete(self.start())
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loop.run_until_complete(self.shutdown_event.wait())
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except (SystemExit, KeyboardInterrupt):
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pass
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finally:
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loop.run_until_complete(self.stop())
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