prometheus/storage/remote/storage.go

125 lines
3.0 KiB
Go

// 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/go-kit/kit/log"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
)
// Callback func that return the oldest timestamp stored in a storage.
type startTimeCallback func() (int64, error)
// Storage represents all the remote read and write endpoints. It implements
// storage.Storage.
type Storage struct {
logger log.Logger
mtx sync.RWMutex
// For writes
queues []*QueueManager
// For reads
clients []*Client
localStartTimeCallback startTimeCallback
externalLabels model.LabelSet
}
// NewStorage returns a remote.Storage.
func NewStorage(l log.Logger, stCallback startTimeCallback) *Storage {
if l == nil {
l = log.NewNopLogger()
}
return &Storage{logger: l, localStartTimeCallback: stCallback}
}
// ApplyConfig updates the state as the new config requires.
func (s *Storage) ApplyConfig(conf *config.Config) error {
s.mtx.Lock()
defer s.mtx.Unlock()
// Update write queues
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,
})
if err != nil {
return err
}
newQueues = append(newQueues, NewQueueManager(
s.logger,
config.DefaultQueueConfig,
conf.GlobalConfig.ExternalLabels,
rwConf.WriteRelabelConfigs,
c,
))
}
for _, q := range s.queues {
q.Stop()
}
s.queues = newQueues
for _, q := range s.queues {
q.Start()
}
// Update read clients
clients := []*Client{}
for i, rrConf := range conf.RemoteReadConfigs {
c, err := NewClient(i, &ClientConfig{
URL: rrConf.URL,
Timeout: rrConf.RemoteTimeout,
HTTPClientConfig: rrConf.HTTPClientConfig,
ReadRecent: rrConf.ReadRecent,
})
if err != nil {
return err
}
clients = append(clients, c)
}
s.clients = clients
s.externalLabels = conf.GlobalConfig.ExternalLabels
return nil
}
// StartTime implements the Storage interface.
func (s *Storage) StartTime() (int64, error) {
return int64(model.Latest), nil
}
// Close the background processing of the storage queues.
func (s *Storage) Close() error {
s.mtx.Lock()
defer s.mtx.Unlock()
for _, q := range s.queues {
q.Stop()
}
return nil
}