123 lines
3.7 KiB
Python
123 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 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 os
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TICKS_PER_SEC = 100
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BYTES_PER_PAGE = 4096
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HAVE_PROC_STAT = os.path.exists("/proc/stat")
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HAVE_PROC_SELF_STAT = os.path.exists("/proc/self/stat")
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HAVE_PROC_SELF_LIMITS = os.path.exists("/proc/self/limits")
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HAVE_PROC_SELF_FD = os.path.exists("/proc/self/fd")
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# Field indexes from /proc/self/stat, taken from the proc(5) manpage
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STAT_FIELDS = {
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"utime": 14,
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"stime": 15,
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"starttime": 22,
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"vsize": 23,
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"rss": 24,
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}
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stats = {}
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# In order to report process_start_time_seconds we need to know the
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# machine's boot time, because the value in /proc/self/stat is relative to
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# this
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boot_time = None
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if HAVE_PROC_STAT:
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with open("/proc/stat") as _procstat:
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for line in _procstat:
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if line.startswith("btime "):
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boot_time = int(line.split()[1])
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def update_resource_metrics():
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if HAVE_PROC_SELF_STAT:
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global stats
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with open("/proc/self/stat") as s:
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line = s.read()
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# line is PID (command) more stats go here ...
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raw_stats = line.split(") ", 1)[1].split(" ")
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for (name, index) in STAT_FIELDS.iteritems():
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# subtract 3 from the index, because proc(5) is 1-based, and
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# we've lost the first two fields in PID and COMMAND above
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stats[name] = int(raw_stats[index - 3])
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def _count_fds():
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# Not every OS will have a /proc/self/fd directory
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if not HAVE_PROC_SELF_FD:
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return 0
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return len(os.listdir("/proc/self/fd"))
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def register_process_collector(process_metrics):
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process_metrics.register_collector(update_resource_metrics)
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if HAVE_PROC_SELF_STAT:
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process_metrics.register_callback(
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"cpu_user_seconds_total",
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lambda: float(stats["utime"]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"cpu_system_seconds_total",
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lambda: float(stats["stime"]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"cpu_seconds_total",
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lambda: (float(stats["utime"] + stats["stime"])) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"virtual_memory_bytes",
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lambda: int(stats["vsize"])
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)
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process_metrics.register_callback(
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"resident_memory_bytes",
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lambda: int(stats["rss"]) * BYTES_PER_PAGE
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)
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process_metrics.register_callback(
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"start_time_seconds",
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lambda: boot_time + int(stats["starttime"]) / TICKS_PER_SEC
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)
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if HAVE_PROC_SELF_FD:
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process_metrics.register_callback(
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"open_fds",
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lambda: _count_fds()
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)
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if HAVE_PROC_SELF_LIMITS:
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def _get_max_fds():
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with open("/proc/self/limits") as limits:
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for line in limits:
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if not line.startswith("Max open files "):
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continue
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# Line is Max open files $SOFT $HARD
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return int(line.split()[3])
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return None
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process_metrics.register_callback(
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"max_fds",
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lambda: _get_max_fds()
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)
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