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prometheus_client
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Filename :
values.py
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from __future__ import unicode_literals import os from threading import Lock from .mmap_dict import mmap_key, MmapedDict class MutexValue(object): """A float protected by a mutex.""" _multiprocess = False def __init__(self, typ, metric_name, name, labelnames, labelvalues, **kwargs): self._value = 0.0 self._lock = Lock() def inc(self, amount): with self._lock: self._value += amount def set(self, value): with self._lock: self._value = value def get(self): with self._lock: return self._value def MultiProcessValue(process_identifier=os.getpid): """Returns a MmapedValue class based on a process_identifier function. The 'process_identifier' function MUST comply with this simple rule: when called in simultaneously running processes it MUST return distinct values. Using a different function than the default 'os.getpid' is at your own risk. """ files = {} values = [] pid = {'value': process_identifier()} # Use a single global lock when in multi-processing mode # as we presume this means there is no threading going on. # This avoids the need to also have mutexes in __MmapDict. lock = Lock() class MmapedValue(object): """A float protected by a mutex backed by a per-process mmaped file.""" _multiprocess = True def __init__(self, typ, metric_name, name, labelnames, labelvalues, multiprocess_mode='', **kwargs): self._params = typ, metric_name, name, labelnames, labelvalues, multiprocess_mode with lock: self.__check_for_pid_change() self.__reset() values.append(self) def __reset(self): typ, metric_name, name, labelnames, labelvalues, multiprocess_mode = self._params if typ == 'gauge': file_prefix = typ + '_' + multiprocess_mode else: file_prefix = typ if file_prefix not in files: filename = os.path.join( os.environ['prometheus_multiproc_dir'], '{0}_{1}.db'.format(file_prefix, pid['value'])) files[file_prefix] = MmapedDict(filename) self._file = files[file_prefix] self._key = mmap_key(metric_name, name, labelnames, labelvalues) self._value = self._file.read_value(self._key) def __check_for_pid_change(self): actual_pid = process_identifier() if pid['value'] != actual_pid: pid['value'] = actual_pid # There has been a fork(), reset all the values. for f in files.values(): f.close() files.clear() for value in values: value.__reset() def inc(self, amount): with lock: self.__check_for_pid_change() self._value += amount self._file.write_value(self._key, self._value) def set(self, value): with lock: self.__check_for_pid_change() self._value = value self._file.write_value(self._key, self._value) def get(self): with lock: self.__check_for_pid_change() return self._value return MmapedValue def get_value_class(): # Should we enable multi-process mode? # This needs to be chosen before the first metric is constructed, # and as that may be in some arbitrary library the user/admin has # no control over we use an environment variable. if 'prometheus_multiproc_dir' in os.environ: return MultiProcessValue() else: return MutexValue ValueClass = get_value_class()