157 lines
4.7 KiB
Python
157 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from functools import wraps
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from prometheus_client import Counter
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from twisted.internet import defer
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from synapse.logging.context import LoggingContext
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from synapse.metrics import InFlightGauge
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logger = logging.getLogger(__name__)
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block_counter = Counter("synapse_util_metrics_block_count", "", ["block_name"])
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block_timer = Counter("synapse_util_metrics_block_time_seconds", "", ["block_name"])
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block_ru_utime = Counter(
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"synapse_util_metrics_block_ru_utime_seconds", "", ["block_name"]
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)
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block_ru_stime = Counter(
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"synapse_util_metrics_block_ru_stime_seconds", "", ["block_name"]
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)
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block_db_txn_count = Counter(
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"synapse_util_metrics_block_db_txn_count", "", ["block_name"]
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)
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# seconds spent waiting for db txns, excluding scheduling time, in this block
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block_db_txn_duration = Counter(
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"synapse_util_metrics_block_db_txn_duration_seconds", "", ["block_name"]
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)
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# seconds spent waiting for a db connection, in this block
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block_db_sched_duration = Counter(
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"synapse_util_metrics_block_db_sched_duration_seconds", "", ["block_name"]
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)
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# Tracks the number of blocks currently active
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in_flight = InFlightGauge(
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"synapse_util_metrics_block_in_flight",
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"",
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labels=["block_name"],
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sub_metrics=["real_time_max", "real_time_sum"],
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)
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def measure_func(name):
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def wrapper(func):
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@wraps(func)
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@defer.inlineCallbacks
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def measured_func(self, *args, **kwargs):
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with Measure(self.clock, name):
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r = yield func(self, *args, **kwargs)
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defer.returnValue(r)
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return measured_func
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return wrapper
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class Measure(object):
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__slots__ = [
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"clock",
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"name",
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"start_context",
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"start",
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"created_context",
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"start_usage",
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]
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def __init__(self, clock, name):
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self.clock = clock
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self.name = name
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self.start_context = None
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self.start = None
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self.created_context = False
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def __enter__(self):
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self.start = self.clock.time()
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self.start_context = LoggingContext.current_context()
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if not self.start_context:
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self.start_context = LoggingContext("Measure")
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self.start_context.__enter__()
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self.created_context = True
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self.start_usage = self.start_context.get_resource_usage()
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in_flight.register((self.name,), self._update_in_flight)
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def __exit__(self, exc_type, exc_val, exc_tb):
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if isinstance(exc_type, Exception) or not self.start_context:
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return
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in_flight.unregister((self.name,), self._update_in_flight)
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duration = self.clock.time() - self.start
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block_counter.labels(self.name).inc()
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block_timer.labels(self.name).inc(duration)
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context = LoggingContext.current_context()
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if context != self.start_context:
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logger.warn(
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"Context has unexpectedly changed from '%s' to '%s'. (%r)",
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self.start_context,
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context,
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self.name,
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)
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return
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if not context:
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logger.warn("Expected context. (%r)", self.name)
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return
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current = context.get_resource_usage()
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usage = current - self.start_usage
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try:
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block_ru_utime.labels(self.name).inc(usage.ru_utime)
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block_ru_stime.labels(self.name).inc(usage.ru_stime)
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block_db_txn_count.labels(self.name).inc(usage.db_txn_count)
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block_db_txn_duration.labels(self.name).inc(usage.db_txn_duration_sec)
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block_db_sched_duration.labels(self.name).inc(usage.db_sched_duration_sec)
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except ValueError:
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logger.warn(
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"Failed to save metrics! OLD: %r, NEW: %r", self.start_usage, current
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)
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if self.created_context:
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self.start_context.__exit__(exc_type, exc_val, exc_tb)
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def _update_in_flight(self, metrics):
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"""Gets called when processing in flight metrics
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"""
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duration = self.clock.time() - self.start
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metrics.real_time_max = max(metrics.real_time_max, duration)
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metrics.real_time_sum += duration
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# TODO: Add other in flight metrics.
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