Initial commit
This commit is contained in:
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@@ -0,0 +1,562 @@
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# Copyright (C) 2019 Garmin Ltd.
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#
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# SPDX-License-Identifier: GPL-2.0-only
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#
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from contextlib import closing, contextmanager
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from datetime import datetime
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import enum
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import asyncio
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import logging
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import math
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import time
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from . import create_async_client, UNIHASH_TABLE_COLUMNS, OUTHASH_TABLE_COLUMNS
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import bb.asyncrpc
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logger = logging.getLogger('hashserv.server')
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class Measurement(object):
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def __init__(self, sample):
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self.sample = sample
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def start(self):
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self.start_time = time.perf_counter()
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def end(self):
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self.sample.add(time.perf_counter() - self.start_time)
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def __enter__(self):
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self.start()
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return self
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def __exit__(self, *args, **kwargs):
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self.end()
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class Sample(object):
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def __init__(self, stats):
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self.stats = stats
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self.num_samples = 0
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self.elapsed = 0
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def measure(self):
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return Measurement(self)
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def __enter__(self):
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return self
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def __exit__(self, *args, **kwargs):
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self.end()
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def add(self, elapsed):
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self.num_samples += 1
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self.elapsed += elapsed
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def end(self):
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if self.num_samples:
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self.stats.add(self.elapsed)
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self.num_samples = 0
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self.elapsed = 0
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class Stats(object):
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def __init__(self):
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self.reset()
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def reset(self):
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self.num = 0
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self.total_time = 0
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self.max_time = 0
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self.m = 0
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self.s = 0
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self.current_elapsed = None
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def add(self, elapsed):
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self.num += 1
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if self.num == 1:
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self.m = elapsed
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self.s = 0
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else:
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last_m = self.m
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self.m = last_m + (elapsed - last_m) / self.num
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self.s = self.s + (elapsed - last_m) * (elapsed - self.m)
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self.total_time += elapsed
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if self.max_time < elapsed:
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self.max_time = elapsed
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def start_sample(self):
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return Sample(self)
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@property
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def average(self):
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if self.num == 0:
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return 0
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return self.total_time / self.num
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@property
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def stdev(self):
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if self.num <= 1:
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return 0
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return math.sqrt(self.s / (self.num - 1))
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def todict(self):
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return {k: getattr(self, k) for k in ('num', 'total_time', 'max_time', 'average', 'stdev')}
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@enum.unique
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class Resolve(enum.Enum):
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FAIL = enum.auto()
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IGNORE = enum.auto()
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REPLACE = enum.auto()
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def insert_table(cursor, table, data, on_conflict):
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resolve = {
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Resolve.FAIL: "",
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Resolve.IGNORE: " OR IGNORE",
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Resolve.REPLACE: " OR REPLACE",
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}[on_conflict]
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keys = sorted(data.keys())
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query = 'INSERT{resolve} INTO {table} ({fields}) VALUES({values})'.format(
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resolve=resolve,
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table=table,
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fields=", ".join(keys),
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values=", ".join(":" + k for k in keys),
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)
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prevrowid = cursor.lastrowid
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cursor.execute(query, data)
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logging.debug(
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"Inserting %r into %s, %s",
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data,
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table,
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on_conflict
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)
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return (cursor.lastrowid, cursor.lastrowid != prevrowid)
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def insert_unihash(cursor, data, on_conflict):
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return insert_table(cursor, "unihashes_v2", data, on_conflict)
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def insert_outhash(cursor, data, on_conflict):
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return insert_table(cursor, "outhashes_v2", data, on_conflict)
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async def copy_unihash_from_upstream(client, db, method, taskhash):
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d = await client.get_taskhash(method, taskhash)
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if d is not None:
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with closing(db.cursor()) as cursor:
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insert_unihash(
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cursor,
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{k: v for k, v in d.items() if k in UNIHASH_TABLE_COLUMNS},
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Resolve.IGNORE,
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)
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db.commit()
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return d
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class ServerCursor(object):
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def __init__(self, db, cursor, upstream):
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self.db = db
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self.cursor = cursor
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self.upstream = upstream
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class ServerClient(bb.asyncrpc.AsyncServerConnection):
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def __init__(self, reader, writer, db, request_stats, backfill_queue, upstream, read_only):
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super().__init__(reader, writer, 'OEHASHEQUIV', logger)
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self.db = db
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self.request_stats = request_stats
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self.max_chunk = bb.asyncrpc.DEFAULT_MAX_CHUNK
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self.backfill_queue = backfill_queue
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self.upstream = upstream
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self.handlers.update({
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'get': self.handle_get,
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'get-outhash': self.handle_get_outhash,
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'get-stream': self.handle_get_stream,
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'get-stats': self.handle_get_stats,
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})
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if not read_only:
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self.handlers.update({
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'report': self.handle_report,
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'report-equiv': self.handle_equivreport,
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'reset-stats': self.handle_reset_stats,
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'backfill-wait': self.handle_backfill_wait,
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})
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def validate_proto_version(self):
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return (self.proto_version > (1, 0) and self.proto_version <= (1, 1))
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async def process_requests(self):
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if self.upstream is not None:
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self.upstream_client = await create_async_client(self.upstream)
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else:
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self.upstream_client = None
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await super().process_requests()
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if self.upstream_client is not None:
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await self.upstream_client.close()
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async def dispatch_message(self, msg):
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for k in self.handlers.keys():
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if k in msg:
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logger.debug('Handling %s' % k)
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if 'stream' in k:
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await self.handlers[k](msg[k])
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else:
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with self.request_stats.start_sample() as self.request_sample, \
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self.request_sample.measure():
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await self.handlers[k](msg[k])
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return
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raise bb.asyncrpc.ClientError("Unrecognized command %r" % msg)
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async def handle_get(self, request):
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method = request['method']
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taskhash = request['taskhash']
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fetch_all = request.get('all', False)
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with closing(self.db.cursor()) as cursor:
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d = await self.get_unihash(cursor, method, taskhash, fetch_all)
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self.write_message(d)
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async def get_unihash(self, cursor, method, taskhash, fetch_all=False):
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d = None
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if fetch_all:
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cursor.execute(
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'''
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SELECT *, unihashes_v2.unihash AS unihash FROM outhashes_v2
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INNER JOIN unihashes_v2 ON unihashes_v2.method=outhashes_v2.method AND unihashes_v2.taskhash=outhashes_v2.taskhash
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WHERE outhashes_v2.method=:method AND outhashes_v2.taskhash=:taskhash
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ORDER BY outhashes_v2.created ASC
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LIMIT 1
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''',
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{
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'method': method,
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'taskhash': taskhash,
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}
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)
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row = cursor.fetchone()
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if row is not None:
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d = {k: row[k] for k in row.keys()}
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elif self.upstream_client is not None:
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d = await self.upstream_client.get_taskhash(method, taskhash, True)
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self.update_unified(cursor, d)
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self.db.commit()
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else:
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row = self.query_equivalent(cursor, method, taskhash)
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if row is not None:
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d = {k: row[k] for k in row.keys()}
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elif self.upstream_client is not None:
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d = await self.upstream_client.get_taskhash(method, taskhash)
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d = {k: v for k, v in d.items() if k in UNIHASH_TABLE_COLUMNS}
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insert_unihash(cursor, d, Resolve.IGNORE)
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self.db.commit()
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return d
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async def handle_get_outhash(self, request):
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method = request['method']
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outhash = request['outhash']
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taskhash = request['taskhash']
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with closing(self.db.cursor()) as cursor:
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d = await self.get_outhash(cursor, method, outhash, taskhash)
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self.write_message(d)
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async def get_outhash(self, cursor, method, outhash, taskhash):
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d = None
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cursor.execute(
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'''
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SELECT *, unihashes_v2.unihash AS unihash FROM outhashes_v2
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INNER JOIN unihashes_v2 ON unihashes_v2.method=outhashes_v2.method AND unihashes_v2.taskhash=outhashes_v2.taskhash
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WHERE outhashes_v2.method=:method AND outhashes_v2.outhash=:outhash
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ORDER BY outhashes_v2.created ASC
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LIMIT 1
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''',
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{
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'method': method,
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'outhash': outhash,
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}
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)
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row = cursor.fetchone()
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if row is not None:
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d = {k: row[k] for k in row.keys()}
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elif self.upstream_client is not None:
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d = await self.upstream_client.get_outhash(method, outhash, taskhash)
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self.update_unified(cursor, d)
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self.db.commit()
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return d
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def update_unified(self, cursor, data):
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if data is None:
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return
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insert_unihash(
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cursor,
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{k: v for k, v in data.items() if k in UNIHASH_TABLE_COLUMNS},
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Resolve.IGNORE
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)
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insert_outhash(
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cursor,
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{k: v for k, v in data.items() if k in OUTHASH_TABLE_COLUMNS},
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Resolve.IGNORE
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)
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async def handle_get_stream(self, request):
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self.write_message('ok')
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while True:
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upstream = None
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l = await self.reader.readline()
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if not l:
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return
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try:
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# This inner loop is very sensitive and must be as fast as
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# possible (which is why the request sample is handled manually
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# instead of using 'with', and also why logging statements are
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# commented out.
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self.request_sample = self.request_stats.start_sample()
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request_measure = self.request_sample.measure()
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request_measure.start()
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l = l.decode('utf-8').rstrip()
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if l == 'END':
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self.writer.write('ok\n'.encode('utf-8'))
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return
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(method, taskhash) = l.split()
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#logger.debug('Looking up %s %s' % (method, taskhash))
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cursor = self.db.cursor()
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try:
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row = self.query_equivalent(cursor, method, taskhash)
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finally:
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cursor.close()
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if row is not None:
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msg = ('%s\n' % row['unihash']).encode('utf-8')
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#logger.debug('Found equivalent task %s -> %s', (row['taskhash'], row['unihash']))
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elif self.upstream_client is not None:
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upstream = await self.upstream_client.get_unihash(method, taskhash)
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if upstream:
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msg = ("%s\n" % upstream).encode("utf-8")
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else:
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msg = "\n".encode("utf-8")
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else:
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msg = '\n'.encode('utf-8')
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self.writer.write(msg)
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finally:
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request_measure.end()
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self.request_sample.end()
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await self.writer.drain()
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# Post to the backfill queue after writing the result to minimize
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# the turn around time on a request
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if upstream is not None:
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await self.backfill_queue.put((method, taskhash))
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async def handle_report(self, data):
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with closing(self.db.cursor()) as cursor:
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outhash_data = {
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'method': data['method'],
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'outhash': data['outhash'],
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'taskhash': data['taskhash'],
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'created': datetime.now()
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}
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for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):
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if k in data:
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outhash_data[k] = data[k]
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# Insert the new entry, unless it already exists
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(rowid, inserted) = insert_outhash(cursor, outhash_data, Resolve.IGNORE)
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if inserted:
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# If this row is new, check if it is equivalent to another
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# output hash
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cursor.execute(
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'''
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SELECT outhashes_v2.taskhash AS taskhash, unihashes_v2.unihash AS unihash FROM outhashes_v2
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INNER JOIN unihashes_v2 ON unihashes_v2.method=outhashes_v2.method AND unihashes_v2.taskhash=outhashes_v2.taskhash
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-- Select any matching output hash except the one we just inserted
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WHERE outhashes_v2.method=:method AND outhashes_v2.outhash=:outhash AND outhashes_v2.taskhash!=:taskhash
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-- Pick the oldest hash
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ORDER BY outhashes_v2.created ASC
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LIMIT 1
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''',
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{
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'method': data['method'],
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'outhash': data['outhash'],
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'taskhash': data['taskhash'],
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}
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)
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row = cursor.fetchone()
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if row is not None:
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# A matching output hash was found. Set our taskhash to the
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# same unihash since they are equivalent
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unihash = row['unihash']
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resolve = Resolve.IGNORE
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else:
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# No matching output hash was found. This is probably the
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# first outhash to be added.
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unihash = data['unihash']
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resolve = Resolve.IGNORE
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# Query upstream to see if it has a unihash we can use
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if self.upstream_client is not None:
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upstream_data = await self.upstream_client.get_outhash(data['method'], data['outhash'], data['taskhash'])
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if upstream_data is not None:
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unihash = upstream_data['unihash']
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||||
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insert_unihash(
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cursor,
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{
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||||
'method': data['method'],
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'taskhash': data['taskhash'],
|
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'unihash': unihash,
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},
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resolve
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||||
)
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||||
|
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unihash_data = await self.get_unihash(cursor, data['method'], data['taskhash'])
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if unihash_data is not None:
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unihash = unihash_data['unihash']
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else:
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unihash = data['unihash']
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self.db.commit()
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||||
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d = {
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'taskhash': data['taskhash'],
|
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'method': data['method'],
|
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'unihash': unihash,
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}
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||||
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self.write_message(d)
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||||
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||||
async def handle_equivreport(self, data):
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with closing(self.db.cursor()) as cursor:
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insert_data = {
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'method': data['method'],
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||||
'taskhash': data['taskhash'],
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'unihash': data['unihash'],
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||||
}
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insert_unihash(cursor, insert_data, Resolve.IGNORE)
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self.db.commit()
|
||||
|
||||
# Fetch the unihash that will be reported for the taskhash. If the
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||||
# unihash matches, it means this row was inserted (or the mapping
|
||||
# was already valid)
|
||||
row = self.query_equivalent(cursor, data['method'], data['taskhash'])
|
||||
|
||||
if row['unihash'] == data['unihash']:
|
||||
logger.info('Adding taskhash equivalence for %s with unihash %s',
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||||
data['taskhash'], row['unihash'])
|
||||
|
||||
d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}
|
||||
|
||||
self.write_message(d)
|
||||
|
||||
|
||||
async def handle_get_stats(self, request):
|
||||
d = {
|
||||
'requests': self.request_stats.todict(),
|
||||
}
|
||||
|
||||
self.write_message(d)
|
||||
|
||||
async def handle_reset_stats(self, request):
|
||||
d = {
|
||||
'requests': self.request_stats.todict(),
|
||||
}
|
||||
|
||||
self.request_stats.reset()
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||||
self.write_message(d)
|
||||
|
||||
async def handle_backfill_wait(self, request):
|
||||
d = {
|
||||
'tasks': self.backfill_queue.qsize(),
|
||||
}
|
||||
await self.backfill_queue.join()
|
||||
self.write_message(d)
|
||||
|
||||
def query_equivalent(self, cursor, method, taskhash):
|
||||
# This is part of the inner loop and must be as fast as possible
|
||||
cursor.execute(
|
||||
'SELECT taskhash, method, unihash FROM unihashes_v2 WHERE method=:method AND taskhash=:taskhash',
|
||||
{
|
||||
'method': method,
|
||||
'taskhash': taskhash,
|
||||
}
|
||||
)
|
||||
return cursor.fetchone()
|
||||
|
||||
|
||||
class Server(bb.asyncrpc.AsyncServer):
|
||||
def __init__(self, db, upstream=None, read_only=False):
|
||||
if upstream and read_only:
|
||||
raise bb.asyncrpc.ServerError("Read-only hashserv cannot pull from an upstream server")
|
||||
|
||||
super().__init__(logger)
|
||||
|
||||
self.request_stats = Stats()
|
||||
self.db = db
|
||||
self.upstream = upstream
|
||||
self.read_only = read_only
|
||||
|
||||
def accept_client(self, reader, writer):
|
||||
return ServerClient(reader, writer, self.db, self.request_stats, self.backfill_queue, self.upstream, self.read_only)
|
||||
|
||||
@contextmanager
|
||||
def _backfill_worker(self):
|
||||
async def backfill_worker_task():
|
||||
client = await create_async_client(self.upstream)
|
||||
try:
|
||||
while True:
|
||||
item = await self.backfill_queue.get()
|
||||
if item is None:
|
||||
self.backfill_queue.task_done()
|
||||
break
|
||||
method, taskhash = item
|
||||
await copy_unihash_from_upstream(client, self.db, method, taskhash)
|
||||
self.backfill_queue.task_done()
|
||||
finally:
|
||||
await client.close()
|
||||
|
||||
async def join_worker(worker):
|
||||
await self.backfill_queue.put(None)
|
||||
await worker
|
||||
|
||||
if self.upstream is not None:
|
||||
worker = asyncio.ensure_future(backfill_worker_task())
|
||||
try:
|
||||
yield
|
||||
finally:
|
||||
self.loop.run_until_complete(join_worker(worker))
|
||||
else:
|
||||
yield
|
||||
|
||||
def run_loop_forever(self):
|
||||
self.backfill_queue = asyncio.Queue()
|
||||
|
||||
with self._backfill_worker():
|
||||
super().run_loop_forever()
|
||||
Reference in New Issue
Block a user