mirror of
https://github.com/prometheus/prometheus.git
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109 lines
2.7 KiB
Go
109 lines
2.7 KiB
Go
// Copyright 2013 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 scrape
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import (
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"context"
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"github.com/prometheus/prometheus/pkg/labels"
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"github.com/prometheus/prometheus/storage"
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)
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type nopAppendable struct{}
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func (a nopAppendable) Appender(_ context.Context) storage.Appender {
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return nopAppender{}
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}
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type nopAppender struct{}
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func (a nopAppender) Add(labels.Labels, int64, float64) (uint64, error) { return 0, nil }
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func (a nopAppender) AddFast(uint64, int64, float64) error { return nil }
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func (a nopAppender) Commit() error { return nil }
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func (a nopAppender) Rollback() error { return nil }
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type sample struct {
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metric labels.Labels
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t int64
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v float64
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}
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// collectResultAppender records all samples that were added through the appender.
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// It can be used as its zero value or be backed by another appender it writes samples through.
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type collectResultAppender struct {
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next storage.Appender
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result []sample
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pendingResult []sample
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rolledbackResult []sample
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mapper map[uint64]labels.Labels
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}
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func (a *collectResultAppender) AddFast(ref uint64, t int64, v float64) error {
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if a.next == nil {
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return storage.ErrNotFound
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}
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err := a.next.AddFast(ref, t, v)
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if err != nil {
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return err
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}
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a.pendingResult = append(a.pendingResult, sample{
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metric: a.mapper[ref],
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t: t,
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v: v,
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})
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return err
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}
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func (a *collectResultAppender) Add(m labels.Labels, t int64, v float64) (uint64, error) {
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a.pendingResult = append(a.pendingResult, sample{
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metric: m,
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t: t,
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v: v,
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})
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if a.next == nil {
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return 0, nil
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}
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if a.mapper == nil {
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a.mapper = map[uint64]labels.Labels{}
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}
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ref, err := a.next.Add(m, t, v)
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if err != nil {
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return 0, err
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}
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a.mapper[ref] = m
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return ref, nil
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}
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func (a *collectResultAppender) Commit() error {
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a.result = append(a.result, a.pendingResult...)
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a.pendingResult = nil
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if a.next == nil {
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return nil
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}
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return a.next.Commit()
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}
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func (a *collectResultAppender) Rollback() error {
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a.rolledbackResult = a.pendingResult
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a.pendingResult = nil
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if a.next == nil {
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return nil
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}
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return a.next.Rollback()
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}
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