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process_collector.py

import os
from typing import Callable, Iterable, Optional, Union

from .metrics_core import CounterMetricFamily, GaugeMetricFamily, Metric
from .registry import Collector, CollectorRegistry, REGISTRY

try:
    import resource

_PAGESIZE = resource.getpagesize()
except ImportError:
    # Not Unix
    _PAGESIZE = 4096

class ProcessCollector(Collector):
    """Collector for Standard Exports such as cpu and memory."""

def __init__(self,
                 namespace: str = '',
                 pid: Callable[[], Union[int, str]] = lambda: 'self',
                 proc: str = '/proc',
                 registry: Optional[CollectorRegistry] = REGISTRY):
        self._namespace = namespace
        self._pid = pid
        self._proc = proc
        if namespace:
            self._prefix = namespace + '_process_'
        else:
            self._prefix = 'process_'
        self._ticks = 100.0
        try:
            self._ticks = os.sysconf('SC_CLK_TCK')
        except (ValueError, TypeError, AttributeError, OSError):
            pass

self._pagesize = _PAGESIZE

# This is used to test if we can access /proc.
        self._btime = 0
        try:
            self._btime = self._boot_time()
        except OSError:
            pass
        if registry:
            registry.register(self)

def _boot_time(self):
        with open(os.path.join(self._proc, 'stat'), 'rb') as stat:
            for line in stat:
                if line.startswith(b'btime '):
                    return float(line.split()[1])

def collect(self) -> Iterable[Metric]:
        if not self._btime:
            return []

pid = os.path.join(self._proc, str(self._pid()).strip())

result = []
        try:
            with open(os.path.join(pid, 'stat'), 'rb') as stat:
                parts = (stat.read().split(b')')[-1].split())

vmem = GaugeMetricFamily(self._prefix + 'virtual_memory_bytes',
                                     'Virtual memory size in bytes.', value=float(parts[20]))
            rss = GaugeMetricFamily(self._prefix + 'resident_memory_bytes', 'Resident memory size in bytes.',
                                    value=float(parts[21]) * self._pagesize)
            start_time_secs = float(parts[19]) / self._ticks
            start_time = GaugeMetricFamily(self._prefix + 'start_time_seconds',
                                           'Start time of the process since unix epoch in seconds.',
                                           value=start_time_secs + self._btime)
            utime = float(parts[11]) / self._ticks
            stime = float(parts[12]) / self._ticks
            cpu = CounterMetricFamily(self._prefix + 'cpu_seconds_total',
                                      'Total user and system CPU time spent in seconds.',
                                      value=utime + stime)
            result.extend([vmem, rss, start_time, cpu])
        except OSError:
            pass

try:
            with open(os.path.join(pid, 'limits'), 'rb') as limits:
                for line in limits:
                    if line.startswith(b'Max open file'):
                        max_fds = GaugeMetricFamily(self._prefix + 'max_fds',
                                                    'Maximum number of open file descriptors.',
                                                    value=float(line.split()[3]))
                        break
            open_fds = GaugeMetricFamily(self._prefix + 'open_fds',
                                         'Number of open file descriptors.',
                                         len(os.listdir(os.path.join(pid, 'fd'))))
            result.extend([open_fds, max_fds])
        except OSError:
            pass

return result

PROCESS_COLLECTOR = ProcessCollector()
"""Default ProcessCollector in default Registry REGISTRY."""

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-04-04 08:02:20
..	dir	-	root/root	0755	2025-12-03 09:30:51
__pycache__	dir	-	root/root	0755	2025-04-04 08:02:20
bridge	dir	-	root/root	0755	2025-04-04 08:02:20
openmetrics	dir	-	root/root	0755	2025-04-04 08:02:20
twisted	dir	-	root/root	0755	2025-04-04 08:02:20
__init__.py	text/x-python	1.77 KB	root/root	0644	2025-04-04 08:02:20
asgi.py	text/x-python	1.57 KB	root/root	0644	2025-04-04 08:02:20
context_managers.py	text/x-python	2.29 KB	root/root	0644	2025-04-04 08:02:20
core.py	text/x-python	860 B	root/root	0644	2025-04-04 08:02:20
decorator.py	text/x-python	15.43 KB	root/root	0644	2025-04-04 08:02:20
exposition.py	text/x-python	25.56 KB	root/root	0644	2025-04-04 08:02:20
gc_collector.py	text/x-python	1.48 KB	root/root	0644	2025-04-04 08:02:20
metrics.py	text/x-python	27.45 KB	root/root	0644	2025-04-04 08:02:20
metrics_core.py	text/x-python	15.18 KB	root/root	0644	2025-04-04 08:02:20
mmap_dict.py	text/x-python	5.27 KB	root/root	0644	2025-04-04 08:02:20
multiprocess.py	text/x-python	7.36 KB	root/root	0644	2025-04-04 08:02:20
parser.py	text/x-python	7.26 KB	root/root	0644	2025-04-04 08:02:20
platform_collector.py	text/x-python	1.83 KB	root/root	0644	2025-04-04 08:02:20
process_collector.py	text/x-python	3.77 KB	root/root	0644	2025-04-04 08:02:20
py.typed	application/x-empty	0 B	root/root	0644	2025-04-04 08:02:20
registry.py	text/x-python	6.05 KB	root/root	0644	2025-04-04 08:02:20
samples.py	text/x-python	1.65 KB	root/root	0644	2025-04-04 08:02:20
utils.py	text/x-python	594 B	root/root	0644	2025-04-04 08:02:20
values.py	text/x-python	4.88 KB	root/root	0644	2025-04-04 08:02:20

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