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// Copyright 2015 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 (
"net/url"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
influx "github.com/influxdb/influxdb/client"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/relabel"
"github.com/prometheus/prometheus/storage/remote/graphite"
"github.com/prometheus/prometheus/storage/remote/influxdb"
"github.com/prometheus/prometheus/storage/remote/opentsdb"
)
// Storage collects multiple remote storage queues.
type Storage struct {
queues []*StorageQueueManager
externalLabels model.LabelSet
relabelConfigs []*config.RelabelConfig
mtx sync.RWMutex
}
// ApplyConfig updates the status state as the new config requires.
func (s *Storage) ApplyConfig(conf *config.Config) error {
s.mtx.Lock()
defer s.mtx.Unlock()
s.externalLabels = conf.GlobalConfig.ExternalLabels
s.relabelConfigs = conf.RemoteWriteConfig.WriteRelabelConfigs
return nil
}
// New returns a new remote Storage.
func New(o *Options) (*Storage, error) {
s := &Storage{}
if o.GraphiteAddress != "" {
c := graphite.NewClient(
o.GraphiteAddress, o.GraphiteTransport,
o.StorageTimeout, o.GraphitePrefix)
s.queues = append(s.queues, NewStorageQueueManager(c, nil))
}
if o.OpentsdbURL != "" {
c := opentsdb.NewClient(o.OpentsdbURL, o.StorageTimeout)
s.queues = append(s.queues, NewStorageQueueManager(c, nil))
}
if o.InfluxdbURL != nil {
conf := influx.Config{
URL: *o.InfluxdbURL,
Username: o.InfluxdbUsername,
Password: o.InfluxdbPassword,
Timeout: o.StorageTimeout,
}
c := influxdb.NewClient(conf, o.InfluxdbDatabase, o.InfluxdbRetentionPolicy)
prometheus.MustRegister(c)
s.queues = append(s.queues, NewStorageQueueManager(c, nil))
}
if len(s.queues) == 0 {
return nil, nil
}
return s, nil
}
// Options contains configuration parameters for a remote storage.
type Options struct {
StorageTimeout time.Duration
InfluxdbURL *url.URL
InfluxdbRetentionPolicy string
InfluxdbUsername string
InfluxdbPassword string
InfluxdbDatabase string
OpentsdbURL string
GraphiteAddress string
GraphiteTransport string
GraphitePrefix string
}
// Start starts the background processing of the storage queues.
func (s *Storage) Start() {
for _, q := range s.queues {
q.Start()
}
}
// Stop the background processing of the storage queues.
func (s *Storage) Stop() {
for _, q := range s.queues {
q.Stop()
}
}
// Append implements storage.SampleAppender. Always returns nil.
func (s *Storage) Append(smpl *model.Sample) error {
s.mtx.RLock()
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.relabelConfigs...))
s.mtx.RUnlock()
if snew.Metric == nil {
return nil
}
for _, q := range s.queues {
q.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 *Storage) NeedsThrottling() bool {
return false
}
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