274 lines
8.2 KiB
Python
274 lines
8.2 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector 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 prometheus_client.core import Counter, Histogram
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from synapse.metrics import LaterGauge
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from synapse.util.logcontext import LoggingContext
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logger = logging.getLogger(__name__)
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# total number of responses served, split by method/servlet/tag
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response_count = Counter(
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"synapse_http_server_response_count", "", ["method", "servlet", "tag"]
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)
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requests_counter = Counter(
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"synapse_http_server_requests_received", "", ["method", "servlet"]
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)
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outgoing_responses_counter = Counter(
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"synapse_http_server_responses", "", ["method", "code"]
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)
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response_timer = Histogram(
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"synapse_http_server_response_time_seconds", "sec", ["method", "servlet", "tag"]
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)
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response_ru_utime = Counter(
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"synapse_http_server_response_ru_utime_seconds", "sec", ["method", "servlet", "tag"]
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)
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response_ru_stime = Counter(
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"synapse_http_server_response_ru_stime_seconds", "sec", ["method", "servlet", "tag"]
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)
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response_db_txn_count = Counter(
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"synapse_http_server_response_db_txn_count", "", ["method", "servlet", "tag"]
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)
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# seconds spent waiting for db txns, excluding scheduling time, when processing
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# this request
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response_db_txn_duration = Counter(
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"synapse_http_server_response_db_txn_duration_seconds",
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"",
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["method", "servlet", "tag"],
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)
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# seconds spent waiting for a db connection, when processing this request
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response_db_sched_duration = Counter(
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"synapse_http_server_response_db_sched_duration_seconds",
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"",
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["method", "servlet", "tag"],
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)
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# size in bytes of the response written
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response_size = Counter(
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"synapse_http_server_response_size", "", ["method", "servlet", "tag"]
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)
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# In flight metrics are incremented while the requests are in flight, rather
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# than when the response was written.
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in_flight_requests_ru_utime = Counter(
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"synapse_http_server_in_flight_requests_ru_utime_seconds",
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"",
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["method", "servlet"],
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)
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in_flight_requests_ru_stime = Counter(
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"synapse_http_server_in_flight_requests_ru_stime_seconds",
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"",
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["method", "servlet"],
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)
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in_flight_requests_db_txn_count = Counter(
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"synapse_http_server_in_flight_requests_db_txn_count", "", ["method", "servlet"]
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)
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# seconds spent waiting for db txns, excluding scheduling time, when processing
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# this request
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in_flight_requests_db_txn_duration = Counter(
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"synapse_http_server_in_flight_requests_db_txn_duration_seconds",
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"",
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["method", "servlet"],
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)
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# seconds spent waiting for a db connection, when processing this request
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in_flight_requests_db_sched_duration = Counter(
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"synapse_http_server_in_flight_requests_db_sched_duration_seconds",
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"",
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["method", "servlet"],
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)
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# The set of all in flight requests, set[RequestMetrics]
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_in_flight_requests = set()
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def _get_in_flight_counts():
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"""Returns a count of all in flight requests by (method, server_name)
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Returns:
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dict[tuple[str, str], int]
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"""
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for rm in _in_flight_requests:
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rm.update_metrics()
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# Map from (method, name) -> int, the number of in flight requests of that
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# type
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counts = {}
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for rm in _in_flight_requests:
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key = (rm.method, rm.name,)
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counts[key] = counts.get(key, 0) + 1
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return counts
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LaterGauge(
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"synapse_http_request_metrics_in_flight_requests_count",
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"",
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["method", "servlet"],
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_get_in_flight_counts,
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)
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class RequestMetrics(object):
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def start(self, time_sec, name, method):
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self.start = time_sec
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self.start_context = LoggingContext.current_context()
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self.name = name
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self.method = method
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self._request_stats = _RequestStats.from_context(self.start_context)
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_in_flight_requests.add(self)
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def stop(self, time_sec, request):
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_in_flight_requests.discard(self)
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context = LoggingContext.current_context()
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tag = ""
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if context:
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tag = context.tag
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if context != self.start_context:
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logger.warn(
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"Context have unexpectedly changed %r, %r",
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context, self.start_context
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)
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return
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outgoing_responses_counter.labels(request.method, str(request.code)).inc()
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response_count.labels(request.method, self.name, tag).inc()
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response_timer.labels(request.method, self.name, tag).observe(
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time_sec - self.start
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)
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ru_utime, ru_stime = context.get_resource_usage()
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response_ru_utime.labels(request.method, self.name, tag).inc(ru_utime)
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response_ru_stime.labels(request.method, self.name, tag).inc(ru_stime)
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response_db_txn_count.labels(request.method, self.name, tag).inc(
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context.db_txn_count
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)
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response_db_txn_duration.labels(request.method, self.name, tag).inc(
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context.db_txn_duration_sec
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)
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response_db_sched_duration.labels(request.method, self.name, tag).inc(
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context.db_sched_duration_sec
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)
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response_size.labels(request.method, self.name, tag).inc(request.sentLength)
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# We always call this at the end to ensure that we update the metrics
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# regardless of whether a call to /metrics while the request was in
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# flight.
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self.update_metrics()
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def update_metrics(self):
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"""Updates the in flight metrics with values from this request.
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"""
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diff = self._request_stats.update(self.start_context)
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in_flight_requests_ru_utime.labels(self.method, self.name).inc(diff.ru_utime)
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in_flight_requests_ru_stime.labels(self.method, self.name).inc(diff.ru_stime)
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in_flight_requests_db_txn_count.labels(self.method, self.name).inc(
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diff.db_txn_count
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)
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in_flight_requests_db_txn_duration.labels(self.method, self.name).inc(
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diff.db_txn_duration_sec
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)
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in_flight_requests_db_sched_duration.labels(self.method, self.name).inc(
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diff.db_sched_duration_sec
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)
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class _RequestStats(object):
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"""Keeps tracks of various metrics for an in flight request.
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"""
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__slots__ = [
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"ru_utime",
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"ru_stime",
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"db_txn_count",
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"db_txn_duration_sec",
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"db_sched_duration_sec",
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]
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def __init__(
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self, ru_utime, ru_stime, db_txn_count, db_txn_duration_sec, db_sched_duration_sec
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):
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self.ru_utime = ru_utime
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self.ru_stime = ru_stime
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self.db_txn_count = db_txn_count
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self.db_txn_duration_sec = db_txn_duration_sec
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self.db_sched_duration_sec = db_sched_duration_sec
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@staticmethod
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def from_context(context):
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ru_utime, ru_stime = context.get_resource_usage()
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return _RequestStats(
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ru_utime, ru_stime,
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context.db_txn_count,
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context.db_txn_duration_sec,
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context.db_sched_duration_sec,
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)
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def update(self, context):
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"""Updates the current values and returns the difference between the
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old and new values.
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Returns:
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_RequestStats: The difference between the old and new values
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"""
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new = _RequestStats.from_context(context)
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diff = _RequestStats(
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new.ru_utime - self.ru_utime,
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new.ru_stime - self.ru_stime,
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new.db_txn_count - self.db_txn_count,
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new.db_txn_duration_sec - self.db_txn_duration_sec,
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new.db_sched_duration_sec - self.db_sched_duration_sec,
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)
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self.ru_utime = new.ru_utime
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self.ru_stime = new.ru_stime
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self.db_txn_count = new.db_txn_count
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self.db_txn_duration_sec = new.db_txn_duration_sec
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self.db_sched_duration_sec = new.db_sched_duration_sec
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return diff
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