Fix dependencies
This commit is contained in:
TwinProduction
556
vendor/github.com/prometheus/client_golang/prometheus/vec.go
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vendored
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556
vendor/github.com/prometheus/client_golang/prometheus/vec.go
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@@ -0,0 +1,556 @@
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// Copyright 2014 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package prometheus
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import (
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"fmt"
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"sync"
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"github.com/prometheus/common/model"
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)
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// MetricVec is a Collector to bundle metrics of the same name that differ in
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// their label values. MetricVec is not used directly but as a building block
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// for implementations of vectors of a given metric type, like GaugeVec,
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// CounterVec, SummaryVec, and HistogramVec. It is exported so that it can be
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// used for custom Metric implementations.
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//
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// To create a FooVec for custom Metric Foo, embed a pointer to MetricVec in
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// FooVec and initialize it with NewMetricVec. Implement wrappers for
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// GetMetricWithLabelValues and GetMetricWith that return (Foo, error) rather
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// than (Metric, error). Similarly, create a wrapper for CurryWith that returns
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// (*FooVec, error) rather than (*MetricVec, error). It is recommended to also
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// add the convenience methods WithLabelValues, With, and MustCurryWith, which
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// panic instead of returning errors. See also the MetricVec example.
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type MetricVec struct {
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*metricMap
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curry []curriedLabelValue
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// hashAdd and hashAddByte can be replaced for testing collision handling.
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hashAdd func(h uint64, s string) uint64
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hashAddByte func(h uint64, b byte) uint64
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}
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// NewMetricVec returns an initialized metricVec.
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func NewMetricVec(desc *Desc, newMetric func(lvs ...string) Metric) *MetricVec {
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return &MetricVec{
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metricMap: &metricMap{
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metrics: map[uint64][]metricWithLabelValues{},
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desc: desc,
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newMetric: newMetric,
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},
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hashAdd: hashAdd,
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hashAddByte: hashAddByte,
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}
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}
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// DeleteLabelValues removes the metric where the variable labels are the same
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// as those passed in as labels (same order as the VariableLabels in Desc). It
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// returns true if a metric was deleted.
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//
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// It is not an error if the number of label values is not the same as the
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// number of VariableLabels in Desc. However, such inconsistent label count can
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// never match an actual metric, so the method will always return false in that
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// case.
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//
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// Note that for more than one label value, this method is prone to mistakes
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// caused by an incorrect order of arguments. Consider Delete(Labels) as an
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// alternative to avoid that type of mistake. For higher label numbers, the
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// latter has a much more readable (albeit more verbose) syntax, but it comes
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// with a performance overhead (for creating and processing the Labels map).
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// See also the CounterVec example.
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func (m *MetricVec) DeleteLabelValues(lvs ...string) bool {
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h, err := m.hashLabelValues(lvs)
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if err != nil {
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return false
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}
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return m.metricMap.deleteByHashWithLabelValues(h, lvs, m.curry)
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}
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// Delete deletes the metric where the variable labels are the same as those
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// passed in as labels. It returns true if a metric was deleted.
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//
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// It is not an error if the number and names of the Labels are inconsistent
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// with those of the VariableLabels in Desc. However, such inconsistent Labels
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// can never match an actual metric, so the method will always return false in
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// that case.
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//
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// This method is used for the same purpose as DeleteLabelValues(...string). See
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// there for pros and cons of the two methods.
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func (m *MetricVec) Delete(labels Labels) bool {
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h, err := m.hashLabels(labels)
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if err != nil {
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return false
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}
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return m.metricMap.deleteByHashWithLabels(h, labels, m.curry)
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}
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// Without explicit forwarding of Describe, Collect, Reset, those methods won't
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// show up in GoDoc.
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// Describe implements Collector.
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func (m *MetricVec) Describe(ch chan<- *Desc) { m.metricMap.Describe(ch) }
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// Collect implements Collector.
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func (m *MetricVec) Collect(ch chan<- Metric) { m.metricMap.Collect(ch) }
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// Reset deletes all metrics in this vector.
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func (m *MetricVec) Reset() { m.metricMap.Reset() }
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// CurryWith returns a vector curried with the provided labels, i.e. the
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// returned vector has those labels pre-set for all labeled operations performed
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// on it. The cardinality of the curried vector is reduced accordingly. The
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// order of the remaining labels stays the same (just with the curried labels
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// taken out of the sequence – which is relevant for the
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// (GetMetric)WithLabelValues methods). It is possible to curry a curried
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// vector, but only with labels not yet used for currying before.
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//
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// The metrics contained in the MetricVec are shared between the curried and
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// uncurried vectors. They are just accessed differently. Curried and uncurried
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// vectors behave identically in terms of collection. Only one must be
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// registered with a given registry (usually the uncurried version). The Reset
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// method deletes all metrics, even if called on a curried vector.
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//
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// Note that CurryWith is usually not called directly but through a wrapper
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// around MetricVec, implementing a vector for a specific Metric
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// implementation, for example GaugeVec.
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func (m *MetricVec) CurryWith(labels Labels) (*MetricVec, error) {
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var (
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newCurry []curriedLabelValue
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oldCurry = m.curry
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iCurry int
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)
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for i, label := range m.desc.variableLabels {
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val, ok := labels[label]
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if iCurry < len(oldCurry) && oldCurry[iCurry].index == i {
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if ok {
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return nil, fmt.Errorf("label name %q is already curried", label)
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}
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newCurry = append(newCurry, oldCurry[iCurry])
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iCurry++
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} else {
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if !ok {
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continue // Label stays uncurried.
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}
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newCurry = append(newCurry, curriedLabelValue{i, val})
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}
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}
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if l := len(oldCurry) + len(labels) - len(newCurry); l > 0 {
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return nil, fmt.Errorf("%d unknown label(s) found during currying", l)
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}
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return &MetricVec{
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metricMap: m.metricMap,
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curry: newCurry,
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hashAdd: m.hashAdd,
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hashAddByte: m.hashAddByte,
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}, nil
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}
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// GetMetricWithLabelValues returns the Metric for the given slice of label
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// values (same order as the variable labels in Desc). If that combination of
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// label values is accessed for the first time, a new Metric is created (by
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// calling the newMetric function provided during construction of the
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// MetricVec).
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//
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// It is possible to call this method without using the returned Metry to only
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// create the new Metric but leave it in its intitial state.
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//
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// Keeping the Metric for later use is possible (and should be considered if
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// performance is critical), but keep in mind that Reset, DeleteLabelValues and
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// Delete can be used to delete the Metric from the MetricVec. In that case, the
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// Metric will still exist, but it will not be exported anymore, even if a
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// Metric with the same label values is created later.
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//
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// An error is returned if the number of label values is not the same as the
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// number of variable labels in Desc (minus any curried labels).
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//
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// Note that for more than one label value, this method is prone to mistakes
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// caused by an incorrect order of arguments. Consider GetMetricWith(Labels) as
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// an alternative to avoid that type of mistake. For higher label numbers, the
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// latter has a much more readable (albeit more verbose) syntax, but it comes
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// with a performance overhead (for creating and processing the Labels map).
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//
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// Note that GetMetricWithLabelValues is usually not called directly but through
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// a wrapper around MetricVec, implementing a vector for a specific Metric
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// implementation, for example GaugeVec.
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func (m *MetricVec) GetMetricWithLabelValues(lvs ...string) (Metric, error) {
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h, err := m.hashLabelValues(lvs)
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if err != nil {
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return nil, err
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}
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return m.metricMap.getOrCreateMetricWithLabelValues(h, lvs, m.curry), nil
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}
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// GetMetricWith returns the Metric for the given Labels map (the label names
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// must match those of the variable labels in Desc). If that label map is
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// accessed for the first time, a new Metric is created. Implications of
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// creating a Metric without using it and keeping the Metric for later use
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// are the same as for GetMetricWithLabelValues.
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//
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// An error is returned if the number and names of the Labels are inconsistent
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// with those of the variable labels in Desc (minus any curried labels).
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//
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// This method is used for the same purpose as
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// GetMetricWithLabelValues(...string). See there for pros and cons of the two
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// methods.
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//
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// Note that GetMetricWith is usually not called directly but through a wrapper
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// around MetricVec, implementing a vector for a specific Metric implementation,
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// for example GaugeVec.
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func (m *MetricVec) GetMetricWith(labels Labels) (Metric, error) {
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h, err := m.hashLabels(labels)
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if err != nil {
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return nil, err
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}
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return m.metricMap.getOrCreateMetricWithLabels(h, labels, m.curry), nil
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}
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func (m *MetricVec) hashLabelValues(vals []string) (uint64, error) {
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if err := validateLabelValues(vals, len(m.desc.variableLabels)-len(m.curry)); err != nil {
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return 0, err
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}
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var (
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h = hashNew()
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curry = m.curry
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iVals, iCurry int
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)
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for i := 0; i < len(m.desc.variableLabels); i++ {
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if iCurry < len(curry) && curry[iCurry].index == i {
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h = m.hashAdd(h, curry[iCurry].value)
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iCurry++
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} else {
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h = m.hashAdd(h, vals[iVals])
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iVals++
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}
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h = m.hashAddByte(h, model.SeparatorByte)
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}
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return h, nil
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}
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func (m *MetricVec) hashLabels(labels Labels) (uint64, error) {
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if err := validateValuesInLabels(labels, len(m.desc.variableLabels)-len(m.curry)); err != nil {
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return 0, err
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}
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var (
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h = hashNew()
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curry = m.curry
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iCurry int
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)
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for i, label := range m.desc.variableLabels {
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val, ok := labels[label]
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if iCurry < len(curry) && curry[iCurry].index == i {
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if ok {
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return 0, fmt.Errorf("label name %q is already curried", label)
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}
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h = m.hashAdd(h, curry[iCurry].value)
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iCurry++
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} else {
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if !ok {
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return 0, fmt.Errorf("label name %q missing in label map", label)
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}
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h = m.hashAdd(h, val)
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}
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h = m.hashAddByte(h, model.SeparatorByte)
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}
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return h, nil
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}
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// metricWithLabelValues provides the metric and its label values for
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// disambiguation on hash collision.
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type metricWithLabelValues struct {
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values []string
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metric Metric
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}
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// curriedLabelValue sets the curried value for a label at the given index.
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type curriedLabelValue struct {
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index int
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value string
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}
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// metricMap is a helper for metricVec and shared between differently curried
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// metricVecs.
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type metricMap struct {
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mtx sync.RWMutex // Protects metrics.
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metrics map[uint64][]metricWithLabelValues
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desc *Desc
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newMetric func(labelValues ...string) Metric
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}
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// Describe implements Collector. It will send exactly one Desc to the provided
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// channel.
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func (m *metricMap) Describe(ch chan<- *Desc) {
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ch <- m.desc
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}
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// Collect implements Collector.
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func (m *metricMap) Collect(ch chan<- Metric) {
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m.mtx.RLock()
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defer m.mtx.RUnlock()
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for _, metrics := range m.metrics {
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for _, metric := range metrics {
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ch <- metric.metric
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}
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}
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}
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// Reset deletes all metrics in this vector.
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func (m *metricMap) Reset() {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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for h := range m.metrics {
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delete(m.metrics, h)
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}
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}
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// deleteByHashWithLabelValues removes the metric from the hash bucket h. If
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// there are multiple matches in the bucket, use lvs to select a metric and
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// remove only that metric.
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func (m *metricMap) deleteByHashWithLabelValues(
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h uint64, lvs []string, curry []curriedLabelValue,
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) bool {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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metrics, ok := m.metrics[h]
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if !ok {
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return false
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}
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i := findMetricWithLabelValues(metrics, lvs, curry)
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if i >= len(metrics) {
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return false
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}
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if len(metrics) > 1 {
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old := metrics
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m.metrics[h] = append(metrics[:i], metrics[i+1:]...)
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old[len(old)-1] = metricWithLabelValues{}
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} else {
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delete(m.metrics, h)
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}
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return true
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}
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// deleteByHashWithLabels removes the metric from the hash bucket h. If there
|
||||
// are multiple matches in the bucket, use lvs to select a metric and remove
|
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// only that metric.
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func (m *metricMap) deleteByHashWithLabels(
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h uint64, labels Labels, curry []curriedLabelValue,
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) bool {
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m.mtx.Lock()
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defer m.mtx.Unlock()
|
||||
|
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metrics, ok := m.metrics[h]
|
||||
if !ok {
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return false
|
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}
|
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i := findMetricWithLabels(m.desc, metrics, labels, curry)
|
||||
if i >= len(metrics) {
|
||||
return false
|
||||
}
|
||||
|
||||
if len(metrics) > 1 {
|
||||
old := metrics
|
||||
m.metrics[h] = append(metrics[:i], metrics[i+1:]...)
|
||||
old[len(old)-1] = metricWithLabelValues{}
|
||||
} else {
|
||||
delete(m.metrics, h)
|
||||
}
|
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return true
|
||||
}
|
||||
|
||||
// getOrCreateMetricWithLabelValues retrieves the metric by hash and label value
|
||||
// or creates it and returns the new one.
|
||||
//
|
||||
// This function holds the mutex.
|
||||
func (m *metricMap) getOrCreateMetricWithLabelValues(
|
||||
hash uint64, lvs []string, curry []curriedLabelValue,
|
||||
) Metric {
|
||||
m.mtx.RLock()
|
||||
metric, ok := m.getMetricWithHashAndLabelValues(hash, lvs, curry)
|
||||
m.mtx.RUnlock()
|
||||
if ok {
|
||||
return metric
|
||||
}
|
||||
|
||||
m.mtx.Lock()
|
||||
defer m.mtx.Unlock()
|
||||
metric, ok = m.getMetricWithHashAndLabelValues(hash, lvs, curry)
|
||||
if !ok {
|
||||
inlinedLVs := inlineLabelValues(lvs, curry)
|
||||
metric = m.newMetric(inlinedLVs...)
|
||||
m.metrics[hash] = append(m.metrics[hash], metricWithLabelValues{values: inlinedLVs, metric: metric})
|
||||
}
|
||||
return metric
|
||||
}
|
||||
|
||||
// getOrCreateMetricWithLabelValues retrieves the metric by hash and label value
|
||||
// or creates it and returns the new one.
|
||||
//
|
||||
// This function holds the mutex.
|
||||
func (m *metricMap) getOrCreateMetricWithLabels(
|
||||
hash uint64, labels Labels, curry []curriedLabelValue,
|
||||
) Metric {
|
||||
m.mtx.RLock()
|
||||
metric, ok := m.getMetricWithHashAndLabels(hash, labels, curry)
|
||||
m.mtx.RUnlock()
|
||||
if ok {
|
||||
return metric
|
||||
}
|
||||
|
||||
m.mtx.Lock()
|
||||
defer m.mtx.Unlock()
|
||||
metric, ok = m.getMetricWithHashAndLabels(hash, labels, curry)
|
||||
if !ok {
|
||||
lvs := extractLabelValues(m.desc, labels, curry)
|
||||
metric = m.newMetric(lvs...)
|
||||
m.metrics[hash] = append(m.metrics[hash], metricWithLabelValues{values: lvs, metric: metric})
|
||||
}
|
||||
return metric
|
||||
}
|
||||
|
||||
// getMetricWithHashAndLabelValues gets a metric while handling possible
|
||||
// collisions in the hash space. Must be called while holding the read mutex.
|
||||
func (m *metricMap) getMetricWithHashAndLabelValues(
|
||||
h uint64, lvs []string, curry []curriedLabelValue,
|
||||
) (Metric, bool) {
|
||||
metrics, ok := m.metrics[h]
|
||||
if ok {
|
||||
if i := findMetricWithLabelValues(metrics, lvs, curry); i < len(metrics) {
|
||||
return metrics[i].metric, true
|
||||
}
|
||||
}
|
||||
return nil, false
|
||||
}
|
||||
|
||||
// getMetricWithHashAndLabels gets a metric while handling possible collisions in
|
||||
// the hash space. Must be called while holding read mutex.
|
||||
func (m *metricMap) getMetricWithHashAndLabels(
|
||||
h uint64, labels Labels, curry []curriedLabelValue,
|
||||
) (Metric, bool) {
|
||||
metrics, ok := m.metrics[h]
|
||||
if ok {
|
||||
if i := findMetricWithLabels(m.desc, metrics, labels, curry); i < len(metrics) {
|
||||
return metrics[i].metric, true
|
||||
}
|
||||
}
|
||||
return nil, false
|
||||
}
|
||||
|
||||
// findMetricWithLabelValues returns the index of the matching metric or
|
||||
// len(metrics) if not found.
|
||||
func findMetricWithLabelValues(
|
||||
metrics []metricWithLabelValues, lvs []string, curry []curriedLabelValue,
|
||||
) int {
|
||||
for i, metric := range metrics {
|
||||
if matchLabelValues(metric.values, lvs, curry) {
|
||||
return i
|
||||
}
|
||||
}
|
||||
return len(metrics)
|
||||
}
|
||||
|
||||
// findMetricWithLabels returns the index of the matching metric or len(metrics)
|
||||
// if not found.
|
||||
func findMetricWithLabels(
|
||||
desc *Desc, metrics []metricWithLabelValues, labels Labels, curry []curriedLabelValue,
|
||||
) int {
|
||||
for i, metric := range metrics {
|
||||
if matchLabels(desc, metric.values, labels, curry) {
|
||||
return i
|
||||
}
|
||||
}
|
||||
return len(metrics)
|
||||
}
|
||||
|
||||
func matchLabelValues(values []string, lvs []string, curry []curriedLabelValue) bool {
|
||||
if len(values) != len(lvs)+len(curry) {
|
||||
return false
|
||||
}
|
||||
var iLVs, iCurry int
|
||||
for i, v := range values {
|
||||
if iCurry < len(curry) && curry[iCurry].index == i {
|
||||
if v != curry[iCurry].value {
|
||||
return false
|
||||
}
|
||||
iCurry++
|
||||
continue
|
||||
}
|
||||
if v != lvs[iLVs] {
|
||||
return false
|
||||
}
|
||||
iLVs++
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func matchLabels(desc *Desc, values []string, labels Labels, curry []curriedLabelValue) bool {
|
||||
if len(values) != len(labels)+len(curry) {
|
||||
return false
|
||||
}
|
||||
iCurry := 0
|
||||
for i, k := range desc.variableLabels {
|
||||
if iCurry < len(curry) && curry[iCurry].index == i {
|
||||
if values[i] != curry[iCurry].value {
|
||||
return false
|
||||
}
|
||||
iCurry++
|
||||
continue
|
||||
}
|
||||
if values[i] != labels[k] {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
func extractLabelValues(desc *Desc, labels Labels, curry []curriedLabelValue) []string {
|
||||
labelValues := make([]string, len(labels)+len(curry))
|
||||
iCurry := 0
|
||||
for i, k := range desc.variableLabels {
|
||||
if iCurry < len(curry) && curry[iCurry].index == i {
|
||||
labelValues[i] = curry[iCurry].value
|
||||
iCurry++
|
||||
continue
|
||||
}
|
||||
labelValues[i] = labels[k]
|
||||
}
|
||||
return labelValues
|
||||
}
|
||||
|
||||
func inlineLabelValues(lvs []string, curry []curriedLabelValue) []string {
|
||||
labelValues := make([]string, len(lvs)+len(curry))
|
||||
var iCurry, iLVs int
|
||||
for i := range labelValues {
|
||||
if iCurry < len(curry) && curry[iCurry].index == i {
|
||||
labelValues[i] = curry[iCurry].value
|
||||
iCurry++
|
||||
continue
|
||||
}
|
||||
labelValues[i] = lvs[iLVs]
|
||||
iLVs++
|
||||
}
|
||||
return labelValues
|
||||
}
|
||||
Reference in New Issue
Block a user