prometheus/scrape/helpers_test.go

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// Copyright 2013 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package scrape
import (
"context"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/storage"
)
type nopAppendable struct{}
func (a nopAppendable) Appender(_ context.Context) storage.Appender {
return nopAppender{}
}
type nopAppender struct{}
func (a nopAppender) Append(uint64, labels.Labels, int64, float64) (uint64, error) { return 0, nil }
func (a nopAppender) Commit() error { return nil }
func (a nopAppender) Rollback() error { return nil }
type sample struct {
metric labels.Labels
t int64
v float64
}
// collectResultAppender records all samples that were added through the appender.
// It can be used as its zero value or be backed by another appender it writes samples through.
type collectResultAppender struct {
next storage.Appender
result []sample
pendingResult []sample
rolledbackResult []sample
}
func (a *collectResultAppender) Append(ref uint64, lset labels.Labels, t int64, v float64) (uint64, error) {
a.pendingResult = append(a.pendingResult, sample{
metric: lset,
t: t,
v: v,
})
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if a.next == nil {
return 0, nil
}
ref, err := a.next.Append(ref, lset, t, v)
if err != nil {
return 0, err
}
return ref, err
}
func (a *collectResultAppender) Commit() error {
a.result = append(a.result, a.pendingResult...)
a.pendingResult = nil
if a.next == nil {
return nil
}
return a.next.Commit()
}
func (a *collectResultAppender) Rollback() error {
a.rolledbackResult = a.pendingResult
a.pendingResult = nil
if a.next == nil {
return nil
}
return a.next.Rollback()
}