mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-12-10 11:54:21 -05:00
240 lines
8.1 KiB
Python
240 lines
8.1 KiB
Python
# -*- coding: utf-8 -*-
|
|
# 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
|
|
from asyncio import iscoroutine
|
|
from functools import wraps
|
|
|
|
import six
|
|
|
|
from prometheus_client.core import REGISTRY, Counter, GaugeMetricFamily
|
|
|
|
from twisted.internet import defer
|
|
|
|
from synapse.logging.context import LoggingContext, PreserveLoggingContext
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
_background_process_start_count = Counter(
|
|
"synapse_background_process_start_count",
|
|
"Number of background processes started",
|
|
["name"],
|
|
)
|
|
|
|
# we set registry=None in all of these to stop them getting registered with
|
|
# the default registry. Instead we collect them all via the CustomCollector,
|
|
# which ensures that we can update them before they are collected.
|
|
#
|
|
_background_process_ru_utime = Counter(
|
|
"synapse_background_process_ru_utime_seconds",
|
|
"User CPU time used by background processes, in seconds",
|
|
["name"],
|
|
registry=None,
|
|
)
|
|
|
|
_background_process_ru_stime = Counter(
|
|
"synapse_background_process_ru_stime_seconds",
|
|
"System CPU time used by background processes, in seconds",
|
|
["name"],
|
|
registry=None,
|
|
)
|
|
|
|
_background_process_db_txn_count = Counter(
|
|
"synapse_background_process_db_txn_count",
|
|
"Number of database transactions done by background processes",
|
|
["name"],
|
|
registry=None,
|
|
)
|
|
|
|
_background_process_db_txn_duration = Counter(
|
|
"synapse_background_process_db_txn_duration_seconds",
|
|
(
|
|
"Seconds spent by background processes waiting for database "
|
|
"transactions, excluding scheduling time"
|
|
),
|
|
["name"],
|
|
registry=None,
|
|
)
|
|
|
|
_background_process_db_sched_duration = Counter(
|
|
"synapse_background_process_db_sched_duration_seconds",
|
|
"Seconds spent by background processes waiting for database connections",
|
|
["name"],
|
|
registry=None,
|
|
)
|
|
|
|
# map from description to a counter, so that we can name our logcontexts
|
|
# incrementally. (It actually duplicates _background_process_start_count, but
|
|
# it's much simpler to do so than to try to combine them.)
|
|
_background_process_counts = dict() # type: dict[str, int]
|
|
|
|
# map from description to the currently running background processes.
|
|
#
|
|
# it's kept as a dict of sets rather than a big set so that we can keep track
|
|
# of process descriptions that no longer have any active processes.
|
|
_background_processes = dict() # type: dict[str, set[_BackgroundProcess]]
|
|
|
|
# A lock that covers the above dicts
|
|
_bg_metrics_lock = threading.Lock()
|
|
|
|
|
|
class _Collector(object):
|
|
"""A custom metrics collector for the background process metrics.
|
|
|
|
Ensures that all of the metrics are up-to-date with any in-flight processes
|
|
before they are returned.
|
|
"""
|
|
|
|
def collect(self):
|
|
background_process_in_flight_count = GaugeMetricFamily(
|
|
"synapse_background_process_in_flight_count",
|
|
"Number of background processes in flight",
|
|
labels=["name"],
|
|
)
|
|
|
|
# We copy the dict so that it doesn't change from underneath us.
|
|
# We also copy the process lists as that can also change
|
|
with _bg_metrics_lock:
|
|
_background_processes_copy = {
|
|
k: list(v) for k, v in six.iteritems(_background_processes)
|
|
}
|
|
|
|
for desc, processes in six.iteritems(_background_processes_copy):
|
|
background_process_in_flight_count.add_metric((desc,), len(processes))
|
|
for process in processes:
|
|
process.update_metrics()
|
|
|
|
yield background_process_in_flight_count
|
|
|
|
# now we need to run collect() over each of the static Counters, and
|
|
# yield each metric they return.
|
|
for m in (
|
|
_background_process_ru_utime,
|
|
_background_process_ru_stime,
|
|
_background_process_db_txn_count,
|
|
_background_process_db_txn_duration,
|
|
_background_process_db_sched_duration,
|
|
):
|
|
for r in m.collect():
|
|
yield r
|
|
|
|
|
|
REGISTRY.register(_Collector())
|
|
|
|
|
|
class _BackgroundProcess(object):
|
|
def __init__(self, desc, ctx):
|
|
self.desc = desc
|
|
self._context = ctx
|
|
self._reported_stats = None
|
|
|
|
def update_metrics(self):
|
|
"""Updates the metrics with values from this process."""
|
|
new_stats = self._context.get_resource_usage()
|
|
if self._reported_stats is None:
|
|
diff = new_stats
|
|
else:
|
|
diff = new_stats - self._reported_stats
|
|
self._reported_stats = new_stats
|
|
|
|
_background_process_ru_utime.labels(self.desc).inc(diff.ru_utime)
|
|
_background_process_ru_stime.labels(self.desc).inc(diff.ru_stime)
|
|
_background_process_db_txn_count.labels(self.desc).inc(diff.db_txn_count)
|
|
_background_process_db_txn_duration.labels(self.desc).inc(
|
|
diff.db_txn_duration_sec
|
|
)
|
|
_background_process_db_sched_duration.labels(self.desc).inc(
|
|
diff.db_sched_duration_sec
|
|
)
|
|
|
|
|
|
def run_as_background_process(desc, func, *args, **kwargs):
|
|
"""Run the given function in its own logcontext, with resource metrics
|
|
|
|
This should be used to wrap processes which are fired off to run in the
|
|
background, instead of being associated with a particular request.
|
|
|
|
It returns a Deferred which completes when the function completes, but it doesn't
|
|
follow the synapse logcontext rules, which makes it appropriate for passing to
|
|
clock.looping_call and friends (or for firing-and-forgetting in the middle of a
|
|
normal synapse inlineCallbacks function).
|
|
|
|
Args:
|
|
desc (str): a description for this background process type
|
|
func: a function, which may return a Deferred or a coroutine
|
|
args: positional args for func
|
|
kwargs: keyword args for func
|
|
|
|
Returns: Deferred which returns the result of func, but note that it does not
|
|
follow the synapse logcontext rules.
|
|
"""
|
|
|
|
@defer.inlineCallbacks
|
|
def run():
|
|
with _bg_metrics_lock:
|
|
count = _background_process_counts.get(desc, 0)
|
|
_background_process_counts[desc] = count + 1
|
|
|
|
_background_process_start_count.labels(desc).inc()
|
|
|
|
with LoggingContext(desc) as context:
|
|
context.request = "%s-%i" % (desc, count)
|
|
proc = _BackgroundProcess(desc, context)
|
|
|
|
with _bg_metrics_lock:
|
|
_background_processes.setdefault(desc, set()).add(proc)
|
|
|
|
try:
|
|
result = func(*args, **kwargs)
|
|
|
|
# We probably don't have an ensureDeferred in our call stack to handle
|
|
# coroutine results, so we need to ensureDeferred here.
|
|
#
|
|
# But we need this check because ensureDeferred doesn't like being
|
|
# called on immediate values (as opposed to Deferreds or coroutines).
|
|
if iscoroutine(result):
|
|
result = defer.ensureDeferred(result)
|
|
|
|
return (yield result)
|
|
except Exception:
|
|
logger.exception("Background process '%s' threw an exception", desc)
|
|
finally:
|
|
proc.update_metrics()
|
|
|
|
with _bg_metrics_lock:
|
|
_background_processes[desc].remove(proc)
|
|
|
|
with PreserveLoggingContext():
|
|
return run()
|
|
|
|
|
|
def wrap_as_background_process(desc):
|
|
"""Decorator that wraps a function that gets called as a background
|
|
process.
|
|
|
|
Equivalent of calling the function with `run_as_background_process`
|
|
"""
|
|
|
|
def wrap_as_background_process_inner(func):
|
|
@wraps(func)
|
|
def wrap_as_background_process_inner_2(*args, **kwargs):
|
|
return run_as_background_process(desc, func, *args, **kwargs)
|
|
|
|
return wrap_as_background_process_inner_2
|
|
|
|
return wrap_as_background_process_inner
|