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670 lines
22 KiB
670 lines
22 KiB
import sys
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from threading import Lock
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import time
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import types
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from . import values # retain this import style for testability
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from .context_managers import ExceptionCounter, InprogressTracker, Timer
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from .metrics_core import (
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Metric, METRIC_LABEL_NAME_RE, METRIC_NAME_RE,
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RESERVED_METRIC_LABEL_NAME_RE,
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)
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from .registry import REGISTRY
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from .utils import floatToGoString, INF
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if sys.version_info > (3,):
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unicode = str
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create_bound_method = types.MethodType
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else:
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def create_bound_method(func, obj):
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return types.MethodType(func, obj, obj.__class__)
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def _build_full_name(metric_type, name, namespace, subsystem, unit):
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full_name = ''
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if namespace:
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full_name += namespace + '_'
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if subsystem:
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full_name += subsystem + '_'
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full_name += name
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if metric_type == 'counter' and full_name.endswith('_total'):
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full_name = full_name[:-6] # Munge to OpenMetrics.
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if unit and not full_name.endswith("_" + unit):
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full_name += "_" + unit
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if unit and metric_type in ('info', 'stateset'):
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raise ValueError('Metric name is of a type that cannot have a unit: ' + full_name)
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return full_name
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def _validate_labelnames(cls, labelnames):
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labelnames = tuple(labelnames)
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for l in labelnames:
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if not METRIC_LABEL_NAME_RE.match(l):
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raise ValueError('Invalid label metric name: ' + l)
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if RESERVED_METRIC_LABEL_NAME_RE.match(l):
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raise ValueError('Reserved label metric name: ' + l)
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if l in cls._reserved_labelnames:
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raise ValueError('Reserved label metric name: ' + l)
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return labelnames
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class MetricWrapperBase(object):
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_type = None
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_reserved_labelnames = ()
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def _is_observable(self):
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# Whether this metric is observable, i.e.
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# * a metric without label names and values, or
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# * the child of a labelled metric.
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return not self._labelnames or (self._labelnames and self._labelvalues)
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def _raise_if_not_observable(self):
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# Functions that mutate the state of the metric, for example incrementing
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# a counter, will fail if the metric is not observable, because only if a
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# metric is observable will the value be initialized.
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if not self._is_observable():
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raise ValueError('%s metric is missing label values' % str(self._type))
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def _is_parent(self):
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return self._labelnames and not self._labelvalues
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def _get_metric(self):
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return Metric(self._name, self._documentation, self._type, self._unit)
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def describe(self):
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return [self._get_metric()]
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def collect(self):
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metric = self._get_metric()
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for suffix, labels, value in self._samples():
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metric.add_sample(self._name + suffix, labels, value)
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return [metric]
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def __str__(self):
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return "{0}:{1}".format(self._type, self._name)
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def __repr__(self):
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metric_type = type(self)
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return "{0}.{1}({2})".format(metric_type.__module__, metric_type.__name__, self._name)
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def __init__(self,
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name,
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documentation,
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labelnames=(),
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namespace='',
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subsystem='',
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unit='',
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registry=REGISTRY,
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labelvalues=None,
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):
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self._name = _build_full_name(self._type, name, namespace, subsystem, unit)
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self._labelnames = _validate_labelnames(self, labelnames)
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self._labelvalues = tuple(labelvalues or ())
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self._kwargs = {}
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self._documentation = documentation
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self._unit = unit
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if not METRIC_NAME_RE.match(self._name):
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raise ValueError('Invalid metric name: ' + self._name)
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if self._is_parent():
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# Prepare the fields needed for child metrics.
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self._lock = Lock()
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self._metrics = {}
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if self._is_observable():
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self._metric_init()
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if not self._labelvalues:
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# Register the multi-wrapper parent metric, or if a label-less metric, the whole shebang.
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if registry:
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registry.register(self)
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def labels(self, *labelvalues, **labelkwargs):
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"""Return the child for the given labelset.
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All metrics can have labels, allowing grouping of related time series.
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Taking a counter as an example:
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from prometheus_client import Counter
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c = Counter('my_requests_total', 'HTTP Failures', ['method', 'endpoint'])
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c.labels('get', '/').inc()
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c.labels('post', '/submit').inc()
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Labels can also be provided as keyword arguments:
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from prometheus_client import Counter
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c = Counter('my_requests_total', 'HTTP Failures', ['method', 'endpoint'])
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c.labels(method='get', endpoint='/').inc()
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c.labels(method='post', endpoint='/submit').inc()
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See the best practices on [naming](http://prometheus.io/docs/practices/naming/)
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and [labels](http://prometheus.io/docs/practices/instrumentation/#use-labels).
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"""
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if not self._labelnames:
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raise ValueError('No label names were set when constructing %s' % self)
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if self._labelvalues:
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raise ValueError('%s already has labels set (%s); can not chain calls to .labels()' % (
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self,
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dict(zip(self._labelnames, self._labelvalues))
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))
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if labelvalues and labelkwargs:
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raise ValueError("Can't pass both *args and **kwargs")
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if labelkwargs:
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if sorted(labelkwargs) != sorted(self._labelnames):
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raise ValueError('Incorrect label names')
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labelvalues = tuple(unicode(labelkwargs[l]) for l in self._labelnames)
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else:
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if len(labelvalues) != len(self._labelnames):
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raise ValueError('Incorrect label count')
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labelvalues = tuple(unicode(l) for l in labelvalues)
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with self._lock:
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if labelvalues not in self._metrics:
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self._metrics[labelvalues] = self.__class__(
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self._name,
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documentation=self._documentation,
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labelnames=self._labelnames,
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unit=self._unit,
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labelvalues=labelvalues,
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**self._kwargs
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)
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return self._metrics[labelvalues]
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def remove(self, *labelvalues):
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if not self._labelnames:
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raise ValueError('No label names were set when constructing %s' % self)
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"""Remove the given labelset from the metric."""
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if len(labelvalues) != len(self._labelnames):
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raise ValueError('Incorrect label count (expected %d, got %s)' % (len(self._labelnames), labelvalues))
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labelvalues = tuple(unicode(l) for l in labelvalues)
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with self._lock:
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del self._metrics[labelvalues]
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def _samples(self):
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if self._is_parent():
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return self._multi_samples()
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else:
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return self._child_samples()
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def _multi_samples(self):
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with self._lock:
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metrics = self._metrics.copy()
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for labels, metric in metrics.items():
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series_labels = list(zip(self._labelnames, labels))
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for suffix, sample_labels, value in metric._samples():
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yield (suffix, dict(series_labels + list(sample_labels.items())), value)
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def _child_samples(self): # pragma: no cover
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raise NotImplementedError('_child_samples() must be implemented by %r' % self)
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def _metric_init(self): # pragma: no cover
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"""
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Initialize the metric object as a child, i.e. when it has labels (if any) set.
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This is factored as a separate function to allow for deferred initialization.
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"""
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raise NotImplementedError('_metric_init() must be implemented by %r' % self)
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class Counter(MetricWrapperBase):
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"""A Counter tracks counts of events or running totals.
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Example use cases for Counters:
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- Number of requests processed
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- Number of items that were inserted into a queue
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- Total amount of data that a system has processed
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Counters can only go up (and be reset when the process restarts). If your use case can go down,
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you should use a Gauge instead.
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An example for a Counter:
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from prometheus_client import Counter
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c = Counter('my_failures_total', 'Description of counter')
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c.inc() # Increment by 1
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c.inc(1.6) # Increment by given value
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There are utilities to count exceptions raised:
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@c.count_exceptions()
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def f():
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pass
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with c.count_exceptions():
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pass
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# Count only one type of exception
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with c.count_exceptions(ValueError):
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pass
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"""
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_type = 'counter'
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def _metric_init(self):
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self._value = values.ValueClass(self._type, self._name, self._name + '_total', self._labelnames,
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self._labelvalues)
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self._created = time.time()
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def inc(self, amount=1):
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"""Increment counter by the given amount."""
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if amount < 0:
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raise ValueError('Counters can only be incremented by non-negative amounts.')
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self._value.inc(amount)
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def count_exceptions(self, exception=Exception):
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"""Count exceptions in a block of code or function.
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Can be used as a function decorator or context manager.
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Increments the counter when an exception of the given
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type is raised up out of the code.
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"""
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self._raise_if_not_observable()
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return ExceptionCounter(self, exception)
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def _child_samples(self):
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return (
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('_total', {}, self._value.get()),
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('_created', {}, self._created),
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)
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class Gauge(MetricWrapperBase):
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"""Gauge metric, to report instantaneous values.
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Examples of Gauges include:
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- Inprogress requests
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- Number of items in a queue
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- Free memory
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- Total memory
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- Temperature
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Gauges can go both up and down.
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from prometheus_client import Gauge
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g = Gauge('my_inprogress_requests', 'Description of gauge')
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g.inc() # Increment by 1
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g.dec(10) # Decrement by given value
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g.set(4.2) # Set to a given value
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There are utilities for common use cases:
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g.set_to_current_time() # Set to current unixtime
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# Increment when entered, decrement when exited.
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@g.track_inprogress()
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def f():
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pass
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with g.track_inprogress():
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pass
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A Gauge can also take its value from a callback:
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d = Gauge('data_objects', 'Number of objects')
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my_dict = {}
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d.set_function(lambda: len(my_dict))
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"""
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_type = 'gauge'
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_MULTIPROC_MODES = frozenset(('min', 'max', 'livesum', 'liveall', 'all'))
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def __init__(self,
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name,
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documentation,
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labelnames=(),
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namespace='',
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subsystem='',
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unit='',
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registry=REGISTRY,
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labelvalues=None,
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multiprocess_mode='all',
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):
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self._multiprocess_mode = multiprocess_mode
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if multiprocess_mode not in self._MULTIPROC_MODES:
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raise ValueError('Invalid multiprocess mode: ' + multiprocess_mode)
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super(Gauge, self).__init__(
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name=name,
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documentation=documentation,
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labelnames=labelnames,
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namespace=namespace,
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subsystem=subsystem,
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unit=unit,
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registry=registry,
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labelvalues=labelvalues,
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)
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self._kwargs['multiprocess_mode'] = self._multiprocess_mode
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def _metric_init(self):
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self._value = values.ValueClass(
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self._type, self._name, self._name, self._labelnames, self._labelvalues,
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multiprocess_mode=self._multiprocess_mode
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)
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def inc(self, amount=1):
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"""Increment gauge by the given amount."""
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self._value.inc(amount)
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def dec(self, amount=1):
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"""Decrement gauge by the given amount."""
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self._value.inc(-amount)
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def set(self, value):
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"""Set gauge to the given value."""
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self._value.set(float(value))
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def set_to_current_time(self):
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"""Set gauge to the current unixtime."""
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self.set(time.time())
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def track_inprogress(self):
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"""Track inprogress blocks of code or functions.
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Can be used as a function decorator or context manager.
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Increments the gauge when the code is entered,
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and decrements when it is exited.
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"""
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self._raise_if_not_observable()
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return InprogressTracker(self)
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def time(self):
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"""Time a block of code or function, and set the duration in seconds.
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Can be used as a function decorator or context manager.
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"""
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self._raise_if_not_observable()
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return Timer(self.set)
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def set_function(self, f):
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"""Call the provided function to return the Gauge value.
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The function must return a float, and may be called from
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multiple threads. All other methods of the Gauge become NOOPs.
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"""
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def samples(self):
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return (('', {}, float(f())),)
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self._child_samples = create_bound_method(samples, self)
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def _child_samples(self):
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return (('', {}, self._value.get()),)
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class Summary(MetricWrapperBase):
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"""A Summary tracks the size and number of events.
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Example use cases for Summaries:
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- Response latency
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- Request size
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Example for a Summary:
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from prometheus_client import Summary
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s = Summary('request_size_bytes', 'Request size (bytes)')
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s.observe(512) # Observe 512 (bytes)
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Example for a Summary using time:
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from prometheus_client import Summary
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REQUEST_TIME = Summary('response_latency_seconds', 'Response latency (seconds)')
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@REQUEST_TIME.time()
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def create_response(request):
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'''A dummy function'''
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time.sleep(1)
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Example for using the same Summary object as a context manager:
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with REQUEST_TIME.time():
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pass # Logic to be timed
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"""
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_type = 'summary'
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_reserved_labelnames = ['quantile']
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def _metric_init(self):
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self._count = values.ValueClass(self._type, self._name, self._name + '_count', self._labelnames,
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self._labelvalues)
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self._sum = values.ValueClass(self._type, self._name, self._name + '_sum', self._labelnames, self._labelvalues)
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self._created = time.time()
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def observe(self, amount):
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"""Observe the given amount."""
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self._count.inc(1)
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self._sum.inc(amount)
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def time(self):
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"""Time a block of code or function, and observe the duration in seconds.
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Can be used as a function decorator or context manager.
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"""
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self._raise_if_not_observable()
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return Timer(self.observe)
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def _child_samples(self):
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return (
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('_count', {}, self._count.get()),
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('_sum', {}, self._sum.get()),
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('_created', {}, self._created))
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|
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class Histogram(MetricWrapperBase):
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"""A Histogram tracks the size and number of events in buckets.
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You can use Histograms for aggregatable calculation of quantiles.
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Example use cases:
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- Response latency
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- Request size
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Example for a Histogram:
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from prometheus_client import Histogram
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h = Histogram('request_size_bytes', 'Request size (bytes)')
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h.observe(512) # Observe 512 (bytes)
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Example for a Histogram using time:
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from prometheus_client import Histogram
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REQUEST_TIME = Histogram('response_latency_seconds', 'Response latency (seconds)')
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@REQUEST_TIME.time()
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def create_response(request):
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'''A dummy function'''
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time.sleep(1)
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Example of using the same Histogram object as a context manager:
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with REQUEST_TIME.time():
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pass # Logic to be timed
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The default buckets are intended to cover a typical web/rpc request from milliseconds to seconds.
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They can be overridden by passing `buckets` keyword argument to `Histogram`.
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"""
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_type = 'histogram'
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_reserved_labelnames = ['le']
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DEFAULT_BUCKETS = (.005, .01, .025, .05, .075, .1, .25, .5, .75, 1.0, 2.5, 5.0, 7.5, 10.0, INF)
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|
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def __init__(self,
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name,
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documentation,
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labelnames=(),
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namespace='',
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subsystem='',
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unit='',
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registry=REGISTRY,
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labelvalues=None,
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buckets=DEFAULT_BUCKETS,
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):
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self._prepare_buckets(buckets)
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super(Histogram, self).__init__(
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name=name,
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documentation=documentation,
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labelnames=labelnames,
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namespace=namespace,
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subsystem=subsystem,
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unit=unit,
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registry=registry,
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labelvalues=labelvalues,
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)
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self._kwargs['buckets'] = buckets
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def _prepare_buckets(self, buckets):
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buckets = [float(b) for b in buckets]
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if buckets != sorted(buckets):
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# This is probably an error on the part of the user,
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# so raise rather than sorting for them.
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raise ValueError('Buckets not in sorted order')
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if buckets and buckets[-1] != INF:
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buckets.append(INF)
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if len(buckets) < 2:
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raise ValueError('Must have at least two buckets')
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self._upper_bounds = buckets
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|
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def _metric_init(self):
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self._buckets = []
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self._created = time.time()
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bucket_labelnames = self._labelnames + ('le',)
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self._sum = values.ValueClass(self._type, self._name, self._name + '_sum', self._labelnames, self._labelvalues)
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for b in self._upper_bounds:
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self._buckets.append(values.ValueClass(
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self._type,
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self._name,
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self._name + '_bucket',
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bucket_labelnames,
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self._labelvalues + (floatToGoString(b),))
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)
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|
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def observe(self, amount):
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"""Observe the given amount."""
|
|
self._sum.inc(amount)
|
|
for i, bound in enumerate(self._upper_bounds):
|
|
if amount <= bound:
|
|
self._buckets[i].inc(1)
|
|
break
|
|
|
|
def time(self):
|
|
"""Time a block of code or function, and observe the duration in seconds.
|
|
|
|
Can be used as a function decorator or context manager.
|
|
"""
|
|
return Timer(self.observe)
|
|
|
|
def _child_samples(self):
|
|
samples = []
|
|
acc = 0
|
|
for i, bound in enumerate(self._upper_bounds):
|
|
acc += self._buckets[i].get()
|
|
samples.append(('_bucket', {'le': floatToGoString(bound)}, acc))
|
|
samples.append(('_count', {}, acc))
|
|
if self._upper_bounds[0] >= 0:
|
|
samples.append(('_sum', {}, self._sum.get()))
|
|
samples.append(('_created', {}, self._created))
|
|
return tuple(samples)
|
|
|
|
|
|
class Info(MetricWrapperBase):
|
|
"""Info metric, key-value pairs.
|
|
|
|
Examples of Info include:
|
|
- Build information
|
|
- Version information
|
|
- Potential target metadata
|
|
|
|
Example usage:
|
|
from prometheus_client import Info
|
|
|
|
i = Info('my_build', 'Description of info')
|
|
i.info({'version': '1.2.3', 'buildhost': 'foo@bar'})
|
|
|
|
Info metrics do not work in multiprocess mode.
|
|
"""
|
|
_type = 'info'
|
|
|
|
def _metric_init(self):
|
|
self._labelname_set = set(self._labelnames)
|
|
self._lock = Lock()
|
|
self._value = {}
|
|
|
|
def info(self, val):
|
|
"""Set info metric."""
|
|
if self._labelname_set.intersection(val.keys()):
|
|
raise ValueError('Overlapping labels for Info metric, metric: %s child: %s' % (
|
|
self._labelnames, val))
|
|
with self._lock:
|
|
self._value = dict(val)
|
|
|
|
def _child_samples(self):
|
|
with self._lock:
|
|
return (('_info', self._value, 1.0,),)
|
|
|
|
|
|
class Enum(MetricWrapperBase):
|
|
"""Enum metric, which of a set of states is true.
|
|
|
|
Example usage:
|
|
from prometheus_client import Enum
|
|
|
|
e = Enum('task_state', 'Description of enum',
|
|
states=['starting', 'running', 'stopped'])
|
|
e.state('running')
|
|
|
|
The first listed state will be the default.
|
|
Enum metrics do not work in multiprocess mode.
|
|
"""
|
|
_type = 'stateset'
|
|
|
|
def __init__(self,
|
|
name,
|
|
documentation,
|
|
labelnames=(),
|
|
namespace='',
|
|
subsystem='',
|
|
unit='',
|
|
registry=REGISTRY,
|
|
labelvalues=None,
|
|
states=None,
|
|
):
|
|
super(Enum, self).__init__(
|
|
name=name,
|
|
documentation=documentation,
|
|
labelnames=labelnames,
|
|
namespace=namespace,
|
|
subsystem=subsystem,
|
|
unit=unit,
|
|
registry=registry,
|
|
labelvalues=labelvalues,
|
|
)
|
|
if name in labelnames:
|
|
raise ValueError('Overlapping labels for Enum metric: %s' % (name,))
|
|
if not states:
|
|
raise ValueError('No states provided for Enum metric: %s' % (name,))
|
|
self._kwargs['states'] = self._states = states
|
|
|
|
def _metric_init(self):
|
|
self._value = 0
|
|
self._lock = Lock()
|
|
|
|
def state(self, state):
|
|
"""Set enum metric state."""
|
|
self._raise_if_not_observable()
|
|
with self._lock:
|
|
self._value = self._states.index(state)
|
|
|
|
def _child_samples(self):
|
|
with self._lock:
|
|
return [
|
|
('', {self._name: s}, 1 if i == self._value else 0,)
|
|
for i, s
|
|
in enumerate(self._states)
|
|
]
|