forked from prometheus/prometheus
/
remote_reloadable.go
108 lines (90 loc) · 2.67 KB
/
remote_reloadable.go
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// Copyright 2016 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 remote
import (
"sync"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/relabel"
)
// Storage collects multiple remote storage queues.
type ReloadableStorage struct {
mtx sync.RWMutex
externalLabels model.LabelSet
conf config.RemoteWriteConfig
queue *StorageQueueManager
}
// New returns a new remote Storage.
func NewConfigurable() *ReloadableStorage {
return &ReloadableStorage{}
}
// ApplyConfig updates the state as the new config requires.
func (s *ReloadableStorage) ApplyConfig(conf *config.Config) error {
s.mtx.Lock()
defer s.mtx.Unlock()
// TODO: we should only stop & recreate queues which have changes,
// as this can be quite disruptive.
var newQueue *StorageQueueManager
if conf.RemoteWriteConfig.URL != nil {
c, err := NewClient(conf.RemoteWriteConfig)
if err != nil {
return err
}
newQueue = NewStorageQueueManager(c, nil)
}
if s.queue != nil {
s.queue.Stop()
}
s.queue = newQueue
s.conf = conf.RemoteWriteConfig
s.externalLabels = conf.GlobalConfig.ExternalLabels
if s.queue != nil {
s.queue.Start()
}
return nil
}
// Stop the background processing of the storage queues.
func (s *ReloadableStorage) Stop() {
if s.queue != nil {
s.queue.Stop()
}
}
// Append implements storage.SampleAppender. Always returns nil.
func (s *ReloadableStorage) Append(smpl *model.Sample) error {
s.mtx.RLock()
defer s.mtx.RUnlock()
if s.queue == nil {
return nil
}
var snew model.Sample
snew = *smpl
snew.Metric = smpl.Metric.Clone()
for ln, lv := range s.externalLabels {
if _, ok := smpl.Metric[ln]; !ok {
snew.Metric[ln] = lv
}
}
snew.Metric = model.Metric(
relabel.Process(model.LabelSet(snew.Metric), s.conf.WriteRelabelConfigs...))
if snew.Metric == nil {
return nil
}
s.queue.Append(&snew)
return nil
}
// NeedsThrottling implements storage.SampleAppender. It will always return
// false as a remote storage drops samples on the floor if backlogging instead
// of asking for throttling.
func (s *ReloadableStorage) NeedsThrottling() bool {
return false
}