mirror of
https://github.com/rocky-linux/peridot.git
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223 lines
6.4 KiB
Go
223 lines
6.4 KiB
Go
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// The MIT License
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//
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// Copyright (c) 2021 Temporal Technologies Inc. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package metrics
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import (
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"sync"
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"sync/atomic"
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"time"
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)
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// This file contains test helpers only. They are not private because they are used by other tests.
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type capturedInfo struct {
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sliceLock sync.RWMutex // Only governs slice access, not what's in the slice
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counters []*CapturedCounter
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gauges []*CapturedGauge
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timers []*CapturedTimer
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}
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// CapturingHandler is a Handler that retains counted values locally.
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type CapturingHandler struct {
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*capturedInfo
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// Never changed once created
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tags map[string]string
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}
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var _ Handler = &CapturingHandler{}
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// NewCapturingHandler creates a new CapturingHandler.
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func NewCapturingHandler() *CapturingHandler { return &CapturingHandler{capturedInfo: &capturedInfo{}} }
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// Clear removes all known metrics from the root handler.
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func (c *CapturingHandler) Clear() {
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c.sliceLock.Lock()
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defer c.sliceLock.Unlock()
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c.counters = nil
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c.gauges = nil
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c.timers = nil
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}
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// WithTags implements Handler.WithTags.
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func (c *CapturingHandler) WithTags(tags map[string]string) Handler {
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ret := &CapturingHandler{capturedInfo: c.capturedInfo, tags: make(map[string]string)}
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for k, v := range c.tags {
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ret.tags[k] = v
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}
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for k, v := range tags {
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ret.tags[k] = v
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}
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return ret
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}
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// Counter implements Handler.Counter.
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func (c *CapturingHandler) Counter(name string) Counter {
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c.sliceLock.Lock()
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defer c.sliceLock.Unlock()
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// Try to find one or create otherwise
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var ret *CapturedCounter
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for _, counter := range c.counters {
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if counter.Name == name && counter.equalTags(c.tags) {
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ret = counter
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break
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}
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}
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if ret == nil {
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ret = &CapturedCounter{CapturedMetricMeta: CapturedMetricMeta{Name: name, Tags: c.tags}}
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c.counters = append(c.counters, ret)
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}
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return ret
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}
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// Counters returns shallow copy of the local counters. New counters will not
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// get added here, but the value within the counter may still change.
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func (c *CapturingHandler) Counters() []*CapturedCounter {
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c.sliceLock.RLock()
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defer c.sliceLock.RUnlock()
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ret := make([]*CapturedCounter, len(c.counters))
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copy(ret, c.counters)
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return ret
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}
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// Gauge implements Handler.Gauge.
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func (c *CapturingHandler) Gauge(name string) Gauge {
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c.sliceLock.Lock()
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defer c.sliceLock.Unlock()
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// Try to find one or create otherwise
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var ret *CapturedGauge
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for _, gauge := range c.gauges {
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if gauge.Name == name && gauge.equalTags(c.tags) {
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ret = gauge
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break
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}
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}
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if ret == nil {
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ret = &CapturedGauge{CapturedMetricMeta: CapturedMetricMeta{Name: name, Tags: c.tags}}
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c.gauges = append(c.gauges, ret)
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}
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return ret
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}
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// Gauges returns shallow copy of the local gauges. New gauges will not get
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// added here, but the value within the gauge may still change.
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func (c *CapturingHandler) Gauges() []*CapturedGauge {
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c.sliceLock.RLock()
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defer c.sliceLock.RUnlock()
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ret := make([]*CapturedGauge, len(c.gauges))
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copy(ret, c.gauges)
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return ret
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}
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// Timer implements Handler.Timer.
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func (c *CapturingHandler) Timer(name string) Timer {
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c.sliceLock.Lock()
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defer c.sliceLock.Unlock()
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// Try to find one or create otherwise
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var ret *CapturedTimer
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for _, timer := range c.timers {
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if timer.Name == name && timer.equalTags(c.tags) {
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ret = timer
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break
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}
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}
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if ret == nil {
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ret = &CapturedTimer{CapturedMetricMeta: CapturedMetricMeta{Name: name, Tags: c.tags}}
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c.timers = append(c.timers, ret)
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}
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return ret
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}
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// Timers returns shallow copy of the local timers. New timers will not get
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// added here, but the value within the timer may still change.
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func (c *CapturingHandler) Timers() []*CapturedTimer {
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c.sliceLock.RLock()
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defer c.sliceLock.RUnlock()
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ret := make([]*CapturedTimer, len(c.timers))
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copy(ret, c.timers)
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return ret
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}
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// CapturedMetricMeta is common information for captured metrics. These fields
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// should never by mutated.
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type CapturedMetricMeta struct {
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Name string
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Tags map[string]string
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}
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func (c *CapturedMetricMeta) equalTags(other map[string]string) bool {
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if len(c.Tags) != len(other) {
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return false
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}
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for k, v := range c.Tags {
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if otherV, ok := other[k]; !ok || otherV != v {
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return false
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}
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}
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return true
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}
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// CapturedCounter atomically implements Counter and provides an atomic getter.
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type CapturedCounter struct {
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CapturedMetricMeta
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value int64
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}
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// Inc implements Counter.Inc.
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func (c *CapturedCounter) Inc(d int64) { atomic.AddInt64(&c.value, d) }
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// Value atomically returns the current value.
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func (c *CapturedCounter) Value() int64 { return atomic.LoadInt64(&c.value) }
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// CapturedGauge atomically implements Gauge and provides an atomic getter.
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type CapturedGauge struct {
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CapturedMetricMeta
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value float64
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valueLock sync.RWMutex
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}
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// Update implements Gauge.Update.
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func (c *CapturedGauge) Update(d float64) {
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c.valueLock.Lock()
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defer c.valueLock.Unlock()
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c.value = d
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}
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// Value atomically returns the current value.
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func (c *CapturedGauge) Value() float64 {
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c.valueLock.RLock()
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defer c.valueLock.RUnlock()
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return c.value
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}
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// CapturedTimer atomically implements Timer and provides an atomic getter.
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type CapturedTimer struct {
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CapturedMetricMeta
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value int64
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}
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// Record implements Timer.Record.
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func (c *CapturedTimer) Record(d time.Duration) { atomic.StoreInt64(&c.value, int64(d)) }
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// Value atomically returns the current value.
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func (c *CapturedTimer) Value() time.Duration { return time.Duration(atomic.LoadInt64(&c.value)) }
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