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115 lines
3.6 KiB
Go
115 lines
3.6 KiB
Go
/*
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*
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* Copyright 2024 gRPC authors.
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*
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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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*
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*/
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// Package stats contains experimental metrics/stats API's.
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package stats
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import "maps"
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// MetricsRecorder records on metrics derived from metric registry.
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type MetricsRecorder interface {
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// RecordInt64Count records the measurement alongside labels on the int
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// count associated with the provided handle.
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RecordInt64Count(handle *Int64CountHandle, incr int64, labels ...string)
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// RecordFloat64Count records the measurement alongside labels on the float
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// count associated with the provided handle.
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RecordFloat64Count(handle *Float64CountHandle, incr float64, labels ...string)
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// RecordInt64Histo records the measurement alongside labels on the int
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// histo associated with the provided handle.
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RecordInt64Histo(handle *Int64HistoHandle, incr int64, labels ...string)
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// RecordFloat64Histo records the measurement alongside labels on the float
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// histo associated with the provided handle.
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RecordFloat64Histo(handle *Float64HistoHandle, incr float64, labels ...string)
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// RecordInt64Gauge records the measurement alongside labels on the int
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// gauge associated with the provided handle.
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RecordInt64Gauge(handle *Int64GaugeHandle, incr int64, labels ...string)
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}
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// Metric is an identifier for a metric.
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type Metric string
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// Metrics is a set of metrics to record. Once created, Metrics is immutable,
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// however Add and Remove can make copies with specific metrics added or
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// removed, respectively.
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//
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// Do not construct directly; use NewMetrics instead.
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type Metrics struct {
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// metrics are the set of metrics to initialize.
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metrics map[Metric]bool
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}
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// NewMetrics returns a Metrics containing Metrics.
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func NewMetrics(metrics ...Metric) *Metrics {
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newMetrics := make(map[Metric]bool)
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for _, metric := range metrics {
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newMetrics[metric] = true
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}
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return &Metrics{
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metrics: newMetrics,
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}
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}
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// Metrics returns the metrics set. The returned map is read-only and must not
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// be modified.
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func (m *Metrics) Metrics() map[Metric]bool {
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return m.metrics
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}
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// Add adds the metrics to the metrics set and returns a new copy with the
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// additional metrics.
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func (m *Metrics) Add(metrics ...Metric) *Metrics {
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newMetrics := make(map[Metric]bool)
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for metric := range m.metrics {
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newMetrics[metric] = true
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}
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for _, metric := range metrics {
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newMetrics[metric] = true
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}
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return &Metrics{
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metrics: newMetrics,
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}
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}
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// Join joins the metrics passed in with the metrics set, and returns a new copy
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// with the merged metrics.
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func (m *Metrics) Join(metrics *Metrics) *Metrics {
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newMetrics := make(map[Metric]bool)
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maps.Copy(newMetrics, m.metrics)
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maps.Copy(newMetrics, metrics.metrics)
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return &Metrics{
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metrics: newMetrics,
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}
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}
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// Remove removes the metrics from the metrics set and returns a new copy with
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// the metrics removed.
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func (m *Metrics) Remove(metrics ...Metric) *Metrics {
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newMetrics := make(map[Metric]bool)
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for metric := range m.metrics {
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newMetrics[metric] = true
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}
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for _, metric := range metrics {
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delete(newMetrics, metric)
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}
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return &Metrics{
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metrics: newMetrics,
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}
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}
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