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https://github.com/prometheus-community/windows_exporter.git
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87 lines
2.6 KiB
Go
87 lines
2.6 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright 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 scrapecache lets the collection own the caches that collectors keep
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// between scrapes, such as internal/labelcache and internal/metriccache.
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//
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// A collector lists its caches with ScrapeCaches. The collection resets them
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// before Build and after Close, and begins a scrape of each cache before
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// Collect and ends it after Collect returned. Collect calls of one collector
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// never overlap, so a scrape always belongs to exactly one Collect call, even
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// one that outlives its scrape budget.
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//
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// Outside of the collection, for example when a test or a library consumer
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// calls Collect directly, the caches have no scrape and every metric is built
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// without them.
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package scrapecache
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// Cache is a cache that a collector keeps between scrapes.
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type Cache interface {
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// BeginScrape begins the scrape of a Collect call.
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BeginScrape()
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// EndScrape ends the scrape after Collect returned err.
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EndScrape(err error)
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// Reset drops the cached entries. Their descriptors may be stale after
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// a new Build.
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Reset()
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}
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// Owner is implemented by collectors that keep caches between scrapes.
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type Owner interface {
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// ScrapeCaches returns the caches of the collector. The collection may
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// call it before Build.
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ScrapeCaches() []Cache
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}
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// Scrape is a scrape of the caches of a collector.
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type Scrape struct {
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caches []Cache
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}
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// Begin begins a scrape of the caches of collector, if it is an [Owner].
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// Call End with the error of Collect once Collect returned.
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func Begin(collector any) Scrape {
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owner, ok := collector.(Owner)
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if !ok {
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return Scrape{}
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}
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caches := owner.ScrapeCaches()
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for _, cache := range caches {
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cache.BeginScrape()
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}
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return Scrape{caches: caches}
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}
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// End ends the scrape after Collect returned err.
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func (s Scrape) End(err error) {
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for _, cache := range s.caches {
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cache.EndScrape(err)
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}
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}
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// Reset resets the caches of collector, if it is an [Owner].
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func Reset(collector any) {
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owner, ok := collector.(Owner)
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if !ok {
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return
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}
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for _, cache := range owner.ScrapeCaches() {
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cache.Reset()
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}
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}
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