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Current File : /opt/hc_python/lib/python3.12/site-packages/prometheus_client/metrics_core.py
import re
from typing import Dict, List, Optional, Sequence, Tuple, Union

from .samples import Exemplar, Sample, Timestamp

METRIC_TYPES = (
    'counter', 'gauge', 'summary', 'histogram',
    'gaugehistogram', 'unknown', 'info', 'stateset',
)
METRIC_NAME_RE = re.compile(r'^[a-zA-Z_:][a-zA-Z0-9_:]*$')
METRIC_LABEL_NAME_RE = re.compile(r'^[a-zA-Z_][a-zA-Z0-9_]*$')
RESERVED_METRIC_LABEL_NAME_RE = re.compile(r'^__.*$')


class Metric:
    """A single metric family and its samples.

    This is intended only for internal use by the instrumentation client.

    Custom collectors should use GaugeMetricFamily, CounterMetricFamily
    and SummaryMetricFamily instead.
    """

    def __init__(self, name: str, documentation: str, typ: str, unit: str = ''):
        if unit and not name.endswith("_" + unit):
            name += "_" + unit
        if not METRIC_NAME_RE.match(name):
            raise ValueError('Invalid metric name: ' + name)
        self.name: str = name
        self.documentation: str = documentation
        self.unit: str = unit
        if typ == 'untyped':
            typ = 'unknown'
        if typ not in METRIC_TYPES:
            raise ValueError('Invalid metric type: ' + typ)
        self.type: str = typ
        self.samples: List[Sample] = []

    def add_sample(self, name: str, labels: Dict[str, str], value: float, timestamp: Optional[Union[Timestamp, float]] = None, exemplar: Optional[Exemplar] = None) -> None:
        """Add a sample to the metric.

        Internal-only, do not use."""
        self.samples.append(Sample(name, labels, value, timestamp, exemplar))

    def __eq__(self, other: object) -> bool:
        return (isinstance(other, Metric)
                and self.name == other.name
                and self.documentation == other.documentation
                and self.type == other.type
                and self.unit == other.unit
                and self.samples == other.samples)

    def __repr__(self) -> str:
        return "Metric({}, {}, {}, {}, {})".format(
            self.name,
            self.documentation,
            self.type,
            self.unit,
            self.samples,
        )

    def _restricted_metric(self, names):
        """Build a snapshot of a metric with samples restricted to a given set of names."""
        samples = [s for s in self.samples if s[0] in names]
        if samples:
            m = Metric(self.name, self.documentation, self.type)
            m.samples = samples
            return m
        return None


class UnknownMetricFamily(Metric):
    """A single unknown metric and its samples.
    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 value: Optional[float] = None,
                 labels: Optional[Sequence[str]] = None,
                 unit: str = '',
                 ):
        Metric.__init__(self, name, documentation, 'unknown', unit)
        if labels is not None and value is not None:
            raise ValueError('Can only specify at most one of value and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        if value is not None:
            self.add_metric([], value)

    def add_metric(self, labels: Sequence[str], value: float, timestamp: Optional[Union[Timestamp, float]] = None) -> None:
        """Add a metric to the metric family.
        Args:
        labels: A list of label values
        value: The value of the metric.
        """
        self.samples.append(Sample(self.name, dict(zip(self._labelnames, labels)), value, timestamp))


# For backward compatibility.
UntypedMetricFamily = UnknownMetricFamily


class CounterMetricFamily(Metric):
    """A single counter and its samples.

    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 value: Optional[float] = None,
                 labels: Optional[Sequence[str]] = None,
                 created: Optional[float] = None,
                 unit: str = '',
                 ):
        # Glue code for pre-OpenMetrics metrics.
        if name.endswith('_total'):
            name = name[:-6]
        Metric.__init__(self, name, documentation, 'counter', unit)
        if labels is not None and value is not None:
            raise ValueError('Can only specify at most one of value and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        if value is not None:
            self.add_metric([], value, created)

    def add_metric(self,
                   labels: Sequence[str],
                   value: float,
                   created: Optional[float] = None,
                   timestamp: Optional[Union[Timestamp, float]] = None,
                   ) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          value: The value of the metric
          created: Optional unix timestamp the child was created at.
        """
        self.samples.append(Sample(self.name + '_total', dict(zip(self._labelnames, labels)), value, timestamp))
        if created is not None:
            self.samples.append(Sample(self.name + '_created', dict(zip(self._labelnames, labels)), created, timestamp))


class GaugeMetricFamily(Metric):
    """A single gauge and its samples.

    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 value: Optional[float] = None,
                 labels: Optional[Sequence[str]] = None,
                 unit: str = '',
                 ):
        Metric.__init__(self, name, documentation, 'gauge', unit)
        if labels is not None and value is not None:
            raise ValueError('Can only specify at most one of value and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        if value is not None:
            self.add_metric([], value)

    def add_metric(self, labels: Sequence[str], value: float, timestamp: Optional[Union[Timestamp, float]] = None) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          value: A float
        """
        self.samples.append(Sample(self.name, dict(zip(self._labelnames, labels)), value, timestamp))


class SummaryMetricFamily(Metric):
    """A single summary and its samples.

    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 count_value: Optional[int] = None,
                 sum_value: Optional[float] = None,
                 labels: Optional[Sequence[str]] = None,
                 unit: str = '',
                 ):
        Metric.__init__(self, name, documentation, 'summary', unit)
        if (sum_value is None) != (count_value is None):
            raise ValueError('count_value and sum_value must be provided together.')
        if labels is not None and count_value is not None:
            raise ValueError('Can only specify at most one of value and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        # The and clause is necessary only for typing, the above ValueError will raise if only one is set.
        if count_value is not None and sum_value is not None:
            self.add_metric([], count_value, sum_value)

    def add_metric(self,
                   labels: Sequence[str],
                   count_value: int,
                   sum_value: float,
                   timestamp:
                   Optional[Union[float, Timestamp]] = None
                   ) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          count_value: The count value of the metric.
          sum_value: The sum value of the metric.
        """
        self.samples.append(Sample(self.name + '_count', dict(zip(self._labelnames, labels)), count_value, timestamp))
        self.samples.append(Sample(self.name + '_sum', dict(zip(self._labelnames, labels)), sum_value, timestamp))


class HistogramMetricFamily(Metric):
    """A single histogram and its samples.

    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 buckets: Optional[Sequence[Union[Tuple[str, float], Tuple[str, float, Exemplar]]]] = None,
                 sum_value: Optional[float] = None,
                 labels: Optional[Sequence[str]] = None,
                 unit: str = '',
                 ):
        Metric.__init__(self, name, documentation, 'histogram', unit)
        if sum_value is not None and buckets is None:
            raise ValueError('sum value cannot be provided without buckets.')
        if labels is not None and buckets is not None:
            raise ValueError('Can only specify at most one of buckets and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        if buckets is not None:
            self.add_metric([], buckets, sum_value)

    def add_metric(self,
                   labels: Sequence[str],
                   buckets: Sequence[Union[Tuple[str, float], Tuple[str, float, Exemplar]]],
                   sum_value: Optional[float],
                   timestamp: Optional[Union[Timestamp, float]] = None) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          buckets: A list of lists.
              Each inner list can be a pair of bucket name and value,
              or a triple of bucket name, value, and exemplar.
              The buckets must be sorted, and +Inf present.
          sum_value: The sum value of the metric.
        """
        for b in buckets:
            bucket, value = b[:2]
            exemplar = None
            if len(b) == 3:
                exemplar = b[2]  # type: ignore
            self.samples.append(Sample(
                self.name + '_bucket',
                dict(list(zip(self._labelnames, labels)) + [('le', bucket)]),
                value,
                timestamp,
                exemplar,
            ))
        # Don't include sum and thus count if there's negative buckets.
        if float(buckets[0][0]) >= 0 and sum_value is not None:
            # +Inf is last and provides the count value.
            self.samples.append(
                Sample(self.name + '_count', dict(zip(self._labelnames, labels)), buckets[-1][1], timestamp))
            self.samples.append(
                Sample(self.name + '_sum', dict(zip(self._labelnames, labels)), sum_value, timestamp))



class GaugeHistogramMetricFamily(Metric):
    """A single gauge histogram and its samples.

    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 buckets: Optional[Sequence[Tuple[str, float]]] = None,
                 gsum_value: Optional[float] = None,
                 labels: Optional[Sequence[str]] = None,
                 unit: str = '',
                 ):
        Metric.__init__(self, name, documentation, 'gaugehistogram', unit)
        if labels is not None and buckets is not None:
            raise ValueError('Can only specify at most one of buckets and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        if buckets is not None:
            self.add_metric([], buckets, gsum_value)

    def add_metric(self,
                   labels: Sequence[str],
                   buckets: Sequence[Tuple[str, float]],
                   gsum_value: Optional[float],
                   timestamp: Optional[Union[float, Timestamp]] = None,
                   ) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          buckets: A list of pairs of bucket names and values.
              The buckets must be sorted, and +Inf present.
          gsum_value: The sum value of the metric.
        """
        for bucket, value in buckets:
            self.samples.append(Sample(
                self.name + '_bucket',
                dict(list(zip(self._labelnames, labels)) + [('le', bucket)]),
                value, timestamp))
        # +Inf is last and provides the count value.
        self.samples.extend([
            Sample(self.name + '_gcount', dict(zip(self._labelnames, labels)), buckets[-1][1], timestamp),
            # TODO: Handle None gsum_value correctly. Currently a None will fail exposition but is allowed here.
            Sample(self.name + '_gsum', dict(zip(self._labelnames, labels)), gsum_value, timestamp),  # type: ignore
        ])


class InfoMetricFamily(Metric):
    """A single info and its samples.

    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 value: Optional[Dict[str, str]] = None,
                 labels: Optional[Sequence[str]] = None,
                 ):
        Metric.__init__(self, name, documentation, 'info')
        if labels is not None and value is not None:
            raise ValueError('Can only specify at most one of value and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        if value is not None:
            self.add_metric([], value)

    def add_metric(self,
                   labels: Sequence[str],
                   value: Dict[str, str],
                   timestamp: Optional[Union[Timestamp, float]] = None,
                   ) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          value: A dict of labels
        """
        self.samples.append(Sample(
            self.name + '_info',
            dict(dict(zip(self._labelnames, labels)), **value),
            1,
            timestamp,
        ))


class StateSetMetricFamily(Metric):
    """A single stateset and its samples.

    For use by custom collectors.
    """

    def __init__(self,
                 name: str,
                 documentation: str,
                 value: Optional[Dict[str, bool]] = None,
                 labels: Optional[Sequence[str]] = None,
                 ):
        Metric.__init__(self, name, documentation, 'stateset')
        if labels is not None and value is not None:
            raise ValueError('Can only specify at most one of value and labels.')
        if labels is None:
            labels = []
        self._labelnames = tuple(labels)
        if value is not None:
            self.add_metric([], value)

    def add_metric(self,
                   labels: Sequence[str],
                   value: Dict[str, bool],
                   timestamp: Optional[Union[Timestamp, float]] = None,
                   ) -> None:
        """Add a metric to the metric family.

        Args:
          labels: A list of label values
          value: A dict of string state names to booleans
        """
        labels = tuple(labels)
        for state, enabled in sorted(value.items()):
            v = (1 if enabled else 0)
            self.samples.append(Sample(
                self.name,
                dict(zip(self._labelnames + (self.name,), labels + (state,))),
                v,
                timestamp,
            ))

Youez - 2016 - github.com/yon3zu
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