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# -*- coding: utf-8 -*-
# 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
from prometheus_client.core import Counter, Histogram
from synapse.metrics import LaterGauge
from synapse.util.logcontext import LoggingContext
logger = logging.getLogger(__name__)
# total number of responses served, split by method/servlet/tag
response_count = Counter("synapse_http_server_response_count", "", ["method", "servlet", "tag"])
requests_counter = Counter("synapse_http_server_requests_received", "", ["method", "servlet"])
outgoing_responses_counter = Counter("synapse_http_server_responses", "", ["method", "code"])
response_timer = Histogram("synapse_http_server_response_time_seconds", "", ["method", "servlet", "tag"])
response_ru_utime = Counter("synapse_http_server_response_ru_utime_seconds", "", ["method", "servlet", "tag"])
response_ru_stime = Counter("synapse_http_server_response_ru_stime_seconds", "", ["method", "servlet", "tag"])
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
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
response_db_sched_duration = Counter("synapse_http_request_response_db_sched_duration_seconds", "", ["method", "servlet", "tag"]
)
# size in bytes of the response written
response_size = Counter("synapse_http_request_response_size", "", ["method", "servlet", "tag"]
)
# In flight metrics are incremented while the requests are in flight, rather
# than when the response was written.
in_flight_requests_ru_utime = Counter("synapse_http_request_in_flight_requests_ru_utime_seconds", "", ["method", "servlet"])
in_flight_requests_ru_stime = Counter("synapse_http_request_in_flight_requests_ru_stime_seconds", "", ["method", "servlet"])
in_flight_requests_db_txn_count = Counter("synapse_http_request_in_flight_requests_db_txn_count", "", ["method", "servlet"])
# seconds spent waiting for db txns, excluding scheduling time, when processing
# this request
in_flight_requests_db_txn_duration = Counter("synapse_http_request_in_flight_requests_db_txn_duration_seconds", "", ["method", "servlet"])
# seconds spent waiting for a db connection, when processing this request
in_flight_requests_db_sched_duration = Counter("synapse_http_request_in_flight_requests_db_sched_duration_seconds", "", ["method", "servlet"])
# The set of all in flight requests, set[RequestMetrics]
_in_flight_requests = set()
def _collect_in_flight():
"""Called just before metrics are collected, so we use it to update all
the in flight request metrics
"""
for rm in _in_flight_requests:
rm.update_metrics()
metrics.register_collector(_collect_in_flight)
def _get_in_flight_counts():
"""Returns a count of all in flight requests by (method, server_name)
Returns:
dict[tuple[str, str], int]
"""
# Map from (method, name) -> int, the number of in flight requests of that
# type
counts = {}
for rm in _in_flight_requests:
key = (rm.method, rm.name,)
counts[key] = counts.get(key, 0) + 1
return counts
LaterGauge(
"synapse_http_request_metrics_in_flight_requests_count", "",
["method", "servlet"],
_get_in_flight_counts
)
class RequestMetrics(object):
def start(self, time_msec, name, method):
self.start = time_msec
self.start_context = LoggingContext.current_context()
self.name = name
self.method = method
self._request_stats = _RequestStats.from_context(self.start_context)
_in_flight_requests.add(self)
def stop(self, time_msec, request):
_in_flight_requests.discard(self)
context = LoggingContext.current_context()
tag = ""
if context:
tag = context.tag
if context != self.start_context:
logger.warn(
"Context have unexpectedly changed %r, %r",
context, self.start_context
)
return
outgoing_responses_counter.labels(request.method, str(request.code)).inc()
response_count.labels(request.method, self.name, tag).inc()
response_timer.labels(request.method, self.name, tag).observe(time_msec - self.start)
ru_utime, ru_stime = context.get_resource_usage()
response_ru_utime.labels(request.method, self.name, tag).inc(ru_utime)
response_ru_stime.labels(request.method, self.name, tag).inc(ru_stime)
response_db_txn_count.labels(request.method, self.name, tag).inc(context.db_txn_count)
response_db_txn_duration.labels(request.method, self.name, tag).inc(context.db_txn_duration_ms / 1000.)
response_db_sched_duration.labels(request.method, self.name, tag).inc(
context.db_sched_duration_ms / 1000.)
response_size.labels(request.method, self.name, tag).inc(request.sentLength)
# 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):
"""Updates the in flight metrics with values from this request.
"""
diff = self._request_stats.update(self.start_context)
in_flight_requests_ru_utime.labels(self.method, self.name).inc(diff.ru_utime)
in_flight_requests_ru_stime.labels(self.method, self.name).inc(diff.ru_stime)
in_flight_requests_db_txn_count.labels(self.method, self.name).inc(diff.db_txn_count)
in_flight_requests_db_txn_duration.labels(self.method, self.name).inc(diff.db_txn_duration_ms / 1000.)
in_flight_requests_db_sched_duration.labels(self.method, self.name).inc(diff.db_sched_duration_ms / 1000.)
class _RequestStats(object):
"""Keeps tracks of various metrics for an in flight request.
"""
__slots__ = [
"ru_utime", "ru_stime",
"db_txn_count", "db_txn_duration_ms", "db_sched_duration_ms",
]
def __init__(self, ru_utime, ru_stime, db_txn_count,
db_txn_duration_ms, db_sched_duration_ms):
self.ru_utime = ru_utime
self.ru_stime = ru_stime
self.db_txn_count = db_txn_count
self.db_txn_duration_ms = db_txn_duration_ms
self.db_sched_duration_ms = db_sched_duration_ms
@staticmethod
def from_context(context):
ru_utime, ru_stime = context.get_resource_usage()
return _RequestStats(
ru_utime, ru_stime,
context.db_txn_count,
context.db_txn_duration_ms,
context.db_sched_duration_ms,
)
def update(self, context):
"""Updates the current values and returns the difference between the
old and new values.
Returns:
_RequestStats: The difference between the old and new values
"""
new = _RequestStats.from_context(context)
diff = _RequestStats(
new.ru_utime - self.ru_utime,
new.ru_stime - self.ru_stime,
new.db_txn_count - self.db_txn_count,
new.db_txn_duration_ms - self.db_txn_duration_ms,
new.db_sched_duration_ms - self.db_sched_duration_ms,
)
self.ru_utime = new.ru_utime
self.ru_stime = new.ru_stime
self.db_txn_count = new.db_txn_count
self.db_txn_duration_ms = new.db_txn_duration_ms
self.db_sched_duration_ms = new.db_sched_duration_ms
return diff
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