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beb3c4b389
This removes legacy support for specific remote storage systems in favor of only offering the generic remote write protocol. An example bridge application that translates from the generic protocol to each of those legacy backends is still provided at: documentation/examples/remote_storage/remote_storage_bridge See also https://github.com/prometheus/prometheus/issues/10 The next step in the plan is to re-add support for multiple remote storages.
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
// Copyright 2017 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 allows queueing samples for remote writes.
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type Storage 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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// ApplyConfig updates the state as the new config requires.
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func (s *Storage) 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 *Storage) 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 *Storage) 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 *Storage) NeedsThrottling() bool {
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return false
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}
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