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venv/lib/python3.12/site-packages/prometheus_client/process_collector.py

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+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."""