mirror of
https://github.com/prometheus/prometheus
synced 2024-12-24 07:23:02 +00:00
108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
// 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) Add(labels.Labels, int64, float64) (uint64, error) { return 0, nil }
|
|
func (a nopAppender) AddFast(uint64, int64, float64) error { return 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
|
|
|
|
mapper map[uint64]labels.Labels
|
|
}
|
|
|
|
func (a *collectResultAppender) AddFast(ref uint64, t int64, v float64) error {
|
|
if a.next == nil {
|
|
return storage.ErrNotFound
|
|
}
|
|
|
|
err := a.next.AddFast(ref, t, v)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
a.pendingResult = append(a.pendingResult, sample{
|
|
metric: a.mapper[ref],
|
|
t: t,
|
|
v: v,
|
|
})
|
|
return err
|
|
}
|
|
|
|
func (a *collectResultAppender) Add(m labels.Labels, t int64, v float64) (uint64, error) {
|
|
a.pendingResult = append(a.pendingResult, sample{
|
|
metric: m,
|
|
t: t,
|
|
v: v,
|
|
})
|
|
if a.next == nil {
|
|
return 0, nil
|
|
}
|
|
|
|
if a.mapper == nil {
|
|
a.mapper = map[uint64]labels.Labels{}
|
|
}
|
|
|
|
ref, err := a.next.Add(m, t, v)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
a.mapper[ref] = m
|
|
return ref, nil
|
|
}
|
|
|
|
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()
|
|
}
|