prometheus/storage/remote/write.go

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// Copyright 2017 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"
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"github.com/prometheus/prometheus/config"
)
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// Writer allows queueing samples for remote writes.
type Writer struct {
mtx sync.RWMutex
queues []*QueueManager
}
// ApplyConfig updates the state as the new config requires.
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func (w *Writer) ApplyConfig(conf *config.Config) error {
w.mtx.Lock()
defer w.mtx.Unlock()
newQueues := []*QueueManager{}
// TODO: we should only stop & recreate queues which have changes,
// as this can be quite disruptive.
for i, rwConf := range conf.RemoteWriteConfigs {
c, err := NewClient(i, &ClientConfig{
URL: rwConf.URL,
Timeout: rwConf.RemoteTimeout,
HTTPClientConfig: rwConf.HTTPClientConfig,
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})
if err != nil {
return err
}
newQueues = append(newQueues, NewQueueManager(
rwConf.QueueConfig,
conf.GlobalConfig.ExternalLabels,
rwConf.WriteRelabelConfigs,
c,
))
}
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for _, q := range w.queues {
q.Stop()
}
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w.queues = newQueues
for _, q := range w.queues {
q.Start()
}
return nil
}
// Stop the background processing of the storage queues.
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func (w *Writer) Stop() {
for _, q := range w.queues {
q.Stop()
}
}
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// Append implements storage.SampleAppender. Always returns nil.
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func (w *Writer) Append(smpl *model.Sample) error {
w.mtx.RLock()
defer w.mtx.RUnlock()
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for _, q := range w.queues {
q.Append(smpl)
}
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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.
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func (w *Writer) NeedsThrottling() bool {
return false
}