109 lines
2.9 KiB
Go
109 lines
2.9 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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"math/rand"
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"github.com/prometheus/prometheus/model/exemplar"
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"github.com/prometheus/prometheus/model/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) Append(storage.SeriesRef, labels.Labels, int64, float64) (storage.SeriesRef, error) {
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return 0, nil
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}
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func (a nopAppender) AppendExemplar(storage.SeriesRef, labels.Labels, exemplar.Exemplar) (storage.SeriesRef, error) {
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return 0, nil
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}
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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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pendingExemplars []exemplar.Exemplar
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resultExemplars []exemplar.Exemplar
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}
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func (a *collectResultAppender) Append(ref storage.SeriesRef, lset labels.Labels, t int64, v float64) (storage.SeriesRef, error) {
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a.pendingResult = append(a.pendingResult, sample{
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metric: lset,
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t: t,
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v: v,
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})
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if ref == 0 {
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ref = storage.SeriesRef(rand.Uint64())
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}
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if a.next == nil {
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return ref, nil
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}
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ref, err := a.next.Append(ref, lset, t, v)
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if err != nil {
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return 0, err
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}
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return ref, err
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}
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func (a *collectResultAppender) AppendExemplar(ref storage.SeriesRef, l labels.Labels, e exemplar.Exemplar) (storage.SeriesRef, error) {
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a.pendingExemplars = append(a.pendingExemplars, e)
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if a.next == nil {
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return 0, nil
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}
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return a.next.AppendExemplar(ref, l, e)
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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.resultExemplars = append(a.resultExemplars, a.pendingExemplars...)
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a.pendingResult = nil
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a.pendingExemplars = 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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