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1b8a474612
The metric clone can't be further optimised, and is a non-trivial memory allocation cost so fast path it if there's no remote writes configured.
109 lines
2.7 KiB
Go
109 lines
2.7 KiB
Go
// Copyright 2016 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 remote
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import (
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"sync"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/relabel"
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)
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// Storage collects multiple remote storage queues.
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type ReloadableStorage struct {
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mtx sync.RWMutex
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externalLabels model.LabelSet
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conf config.RemoteWriteConfig
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queue *StorageQueueManager
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}
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// New returns a new remote Storage.
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func NewConfigurable() *ReloadableStorage {
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return &ReloadableStorage{}
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}
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// ApplyConfig updates the state as the new config requires.
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func (s *ReloadableStorage) ApplyConfig(conf *config.Config) error {
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s.mtx.Lock()
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defer s.mtx.Unlock()
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// TODO: we should only stop & recreate queues which have changes,
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// as this can be quite disruptive.
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var newQueue *StorageQueueManager
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if conf.RemoteWriteConfig.URL != nil {
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c, err := NewClient(conf.RemoteWriteConfig)
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if err != nil {
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return err
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}
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newQueue = NewStorageQueueManager(c, nil)
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}
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if s.queue != nil {
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s.queue.Stop()
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}
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s.queue = newQueue
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s.conf = conf.RemoteWriteConfig
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s.externalLabels = conf.GlobalConfig.ExternalLabels
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if s.queue != nil {
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s.queue.Start()
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}
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return nil
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}
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// Stop the background processing of the storage queues.
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func (s *ReloadableStorage) Stop() {
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if s.queue != nil {
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s.queue.Stop()
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}
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}
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// Append implements storage.SampleAppender. Always returns nil.
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func (s *ReloadableStorage) Append(smpl *model.Sample) error {
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s.mtx.RLock()
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defer s.mtx.RUnlock()
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if s.queue == nil {
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return nil
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}
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var snew model.Sample
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snew = *smpl
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snew.Metric = smpl.Metric.Clone()
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for ln, lv := range s.externalLabels {
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if _, ok := smpl.Metric[ln]; !ok {
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snew.Metric[ln] = lv
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}
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}
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snew.Metric = model.Metric(
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relabel.Process(model.LabelSet(snew.Metric), s.conf.WriteRelabelConfigs...))
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if snew.Metric == nil {
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return nil
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}
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s.queue.Append(&snew)
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return nil
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}
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// NeedsThrottling implements storage.SampleAppender. It will always return
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// false as a remote storage drops samples on the floor if backlogging instead
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// of asking for throttling.
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func (s *ReloadableStorage) NeedsThrottling() bool {
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return false
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}
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