MatrixSynapse/synapse/http/request_metrics.py

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# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import threading
import traceback
from typing import Dict, Mapping, Set, Tuple
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from prometheus_client.core import Counter, Histogram
from synapse.logging.context import current_context
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from synapse.metrics import LaterGauge
logger = logging.getLogger(__name__)
# total number of responses served, split by method/servlet/tag
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response_count = Counter(
"synapse_http_server_response_count", "", ["method", "servlet", "tag"]
)
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requests_counter = Counter(
"synapse_http_server_requests_received", "", ["method", "servlet"]
)
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outgoing_responses_counter = Counter(
"synapse_http_server_responses", "", ["method", "code"]
)
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response_timer = Histogram(
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"synapse_http_server_response_time_seconds",
"sec",
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["method", "servlet", "tag", "code"],
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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(
"synapse_http_server_response_db_txn_count", "", ["method", "servlet", "tag"]
)
# seconds spent waiting for db txns, excluding scheduling time, when processing
# this request
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response_db_txn_duration = Counter(
"synapse_http_server_response_db_txn_duration_seconds",
"",
["method", "servlet", "tag"],
)
# 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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"",
["method", "servlet", "tag"],
)
# 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"]
)
# In flight metrics are incremented while the requests are in flight, rather
# 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", "", ["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", "", ["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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)
# seconds spent waiting for db txns, excluding scheduling time, when processing
# 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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"",
["method", "servlet"],
)
# 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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"",
["method", "servlet"],
)
_in_flight_requests: Set["RequestMetrics"] = set()
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# Protects the _in_flight_requests set from concurrent access
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_in_flight_requests_lock = threading.Lock()
def _get_in_flight_counts() -> Mapping[Tuple[str, ...], int]:
"""Returns a count of all in flight requests by (method, server_name)"""
# Cast to a list to prevent it changing while the Prometheus
# thread is collecting metrics
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with _in_flight_requests_lock:
reqs = list(_in_flight_requests)
for rm in reqs:
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rm.update_metrics()
# Map from (method, name) -> int, the number of in flight requests of that
# type. The key type is Tuple[str, str], but we leave the length unspecified
# for compatability with LaterGauge's annotations.
counts: Dict[Tuple[str, ...], int] = {}
for rm in reqs:
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key = (rm.method, rm.name)
counts[key] = counts.get(key, 0) + 1
return counts
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LaterGauge(
"synapse_http_server_in_flight_requests_count",
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"",
["method", "servlet"],
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_get_in_flight_counts,
)
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class RequestMetrics:
def start(self, time_sec: float, name: str, method: str) -> None:
self.start_ts = time_sec
self.start_context = current_context()
self.name = name
self.method = method
if self.start_context:
# _request_stats records resource usage that we have already added
# to the "in flight" metrics.
self._request_stats = self.start_context.get_resource_usage()
else:
logger.error(
"Tried to start a RequestMetric from the sentinel context.\n%s",
"".join(traceback.format_stack()),
)
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with _in_flight_requests_lock:
_in_flight_requests.add(self)
def stop(self, time_sec: float, response_code: int, sent_bytes: int) -> None:
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with _in_flight_requests_lock:
_in_flight_requests.discard(self)
context = current_context()
tag = ""
if context:
tag = context.tag
if context != self.start_context:
logger.error(
"Context have unexpectedly changed %r, %r",
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context,
self.start_context,
)
return
else:
logger.error(
"Trying to stop RequestMetrics in the sentinel context.\n%s",
"".join(traceback.format_stack()),
)
return
response_code_str = str(response_code)
outgoing_responses_counter.labels(self.method, response_code_str).inc()
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response_count.labels(self.method, self.name, tag).inc()
response_timer.labels(self.method, self.name, tag, response_code_str).observe(
time_sec - self.start_ts
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)
resource_usage = context.get_resource_usage()
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response_ru_utime.labels(self.method, self.name, tag).inc(
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resource_usage.ru_utime
)
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response_ru_stime.labels(self.method, self.name, tag).inc(
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resource_usage.ru_stime
)
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response_db_txn_count.labels(self.method, self.name, tag).inc(
resource_usage.db_txn_count
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)
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response_db_txn_duration.labels(self.method, self.name, tag).inc(
resource_usage.db_txn_duration_sec
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)
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response_db_sched_duration.labels(self.method, self.name, tag).inc(
resource_usage.db_sched_duration_sec
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)
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response_size.labels(self.method, self.name, tag).inc(sent_bytes)
# We always call this at the end to ensure that we update the metrics
# regardless of whether a call to /metrics while the request was in
# flight.
self.update_metrics()
def update_metrics(self) -> None:
"""Updates the in flight metrics with values from this request."""
if not self.start_context:
logger.error(
"Tried to update a RequestMetric from the sentinel context.\n%s",
"".join(traceback.format_stack()),
)
return
new_stats = self.start_context.get_resource_usage()
diff = new_stats - self._request_stats
self._request_stats = new_stats
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# max() is used since rapid use of ru_stime/ru_utime can end up with the
# count going backwards due to NTP, time smearing, fine-grained
# correction, or floating points. Who knows, really?
in_flight_requests_ru_utime.labels(self.method, self.name).inc(
max(diff.ru_utime, 0)
)
in_flight_requests_ru_stime.labels(self.method, self.name).inc(
max(diff.ru_stime, 0)
)
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in_flight_requests_db_txn_count.labels(self.method, self.name).inc(
diff.db_txn_count
)
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in_flight_requests_db_txn_duration.labels(self.method, self.name).inc(
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(
diff.db_sched_duration_sec
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)