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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 (
"context"
"sync"
"time"
"github.com/go-kit/kit/log"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/storage"
)
// startTimeCallback is a 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
queryables []storage.Queryable
localStartTimeCallback startTimeCallback
flushDeadline time.Duration
}
// NewStorage returns a remote.Storage.
func NewStorage(l log.Logger, stCallback startTimeCallback, flushDeadline time.Duration) *Storage {
if l == nil {
l = log.NewNopLogger()
}
return &Storage{
logger: l,
localStartTimeCallback: stCallback,
flushDeadline: flushDeadline,
}
}
// 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,
rwConf.QueueConfig,
conf.GlobalConfig.ExternalLabels,
rwConf.WriteRelabelConfigs,
c,
s.flushDeadline,
))
}
for _, q := range s.queues {
q.Stop()
}
s.queues = newQueues
for _, q := range s.queues {
q.Start()
}
// Update read clients
s.queryables = make([]storage.Queryable, 0, len(conf.RemoteReadConfigs))
for i, rrConf := range conf.RemoteReadConfigs {
c, err := NewClient(i, &ClientConfig{
URL: rrConf.URL,
Timeout: rrConf.RemoteTimeout,
HTTPClientConfig: rrConf.HTTPClientConfig,
})
if err != nil {
return err
}
q := QueryableClient(c)
q = ExternalLabelsHandler(q, conf.GlobalConfig.ExternalLabels)
if len(rrConf.RequiredMatchers) > 0 {
q = RequiredMatchersFilter(q, labelsToEqualityMatchers(rrConf.RequiredMatchers))
}
if !rrConf.ReadRecent {
q = PreferLocalStorageFilter(q, s.localStartTimeCallback)
}
s.queryables = append(s.queryables, q)
}
return nil
}
// StartTime implements the Storage interface.
func (s *Storage) StartTime() (int64, error) {
return int64(model.Latest), nil
}
// Querier returns a storage.MergeQuerier combining the remote client queriers
// of each configured remote read endpoint.
func (s *Storage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
s.mtx.Lock()
queryables := s.queryables
s.mtx.Unlock()
queriers := make([]storage.Querier, 0, len(queryables))
for _, queryable := range queryables {
q, err := queryable.Querier(ctx, mint, maxt)
if err != nil {
return nil, err
}
queriers = append(queriers, q)
}
return storage.NewMergeQuerier(nil, queriers), 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
}
func labelsToEqualityMatchers(ls model.LabelSet) []*labels.Matcher {
ms := make([]*labels.Matcher, 0, len(ls))
for k, v := range ls {
ms = append(ms, &labels.Matcher{
Type: labels.MatchEqual,
Name: string(k),
Value: string(v),
})
}
return ms
}
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