prometheus/retrieval/targetmanager.go

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// Copyright 2013 The Prometheus Authors
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// 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 retrieval
import (
"sync"
"github.com/golang/glog"
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/storage"
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)
// TargetManager manages all scrape targets. All methods are goroutine-safe.
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type TargetManager interface {
AddTarget(job config.JobConfig, t Target)
ReplaceTargets(job config.JobConfig, newTargets []Target)
Remove(t Target)
AddTargetsFromConfig(config config.Config)
Stop()
Pools() map[string]*TargetPool // Returns a copy of the name -> TargetPool mapping.
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}
type targetManager struct {
sync.Mutex // Protects poolByJob.
globalLabels clientmodel.LabelSet
sampleAppender storage.SampleAppender
poolsByJob map[string]*TargetPool
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}
// NewTargetManager returns a newly initialized TargetManager ready to use.
func NewTargetManager(sampleAppender storage.SampleAppender, globalLabels clientmodel.LabelSet) TargetManager {
return &targetManager{
sampleAppender: sampleAppender,
globalLabels: globalLabels,
poolsByJob: make(map[string]*TargetPool),
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}
}
func (m *targetManager) targetPoolForJob(job config.JobConfig) *TargetPool {
targetPool, ok := m.poolsByJob[job.GetName()]
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if !ok {
var provider TargetProvider
if job.SdName != nil {
provider = NewSdTargetProvider(job, m.globalLabels)
}
interval := job.ScrapeInterval()
targetPool = NewTargetPool(provider, m.sampleAppender, interval)
glog.Infof("Pool for job %s does not exist; creating and starting...", job.GetName())
m.poolsByJob[job.GetName()] = targetPool
go targetPool.Run()
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}
return targetPool
}
func (m *targetManager) AddTarget(job config.JobConfig, t Target) {
m.Lock()
defer m.Unlock()
targetPool := m.targetPoolForJob(job)
targetPool.AddTarget(t)
m.poolsByJob[job.GetName()] = targetPool
}
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func (m *targetManager) ReplaceTargets(job config.JobConfig, newTargets []Target) {
m.Lock()
defer m.Unlock()
targetPool := m.targetPoolForJob(job)
targetPool.ReplaceTargets(newTargets)
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}
func (m *targetManager) Remove(t Target) {
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panic("not implemented")
}
func (m *targetManager) AddTargetsFromConfig(config config.Config) {
for _, job := range config.Jobs() {
if job.SdName != nil {
m.Lock()
m.targetPoolForJob(job)
m.Unlock()
continue
}
for _, targetGroup := range job.TargetGroup {
baseLabels := clientmodel.LabelSet{
clientmodel.JobLabel: clientmodel.LabelValue(job.GetName()),
}
for n, v := range m.globalLabels {
baseLabels[n] = v
}
if targetGroup.Labels != nil {
for _, label := range targetGroup.Labels.Label {
baseLabels[clientmodel.LabelName(label.GetName())] = clientmodel.LabelValue(label.GetValue())
}
}
for _, endpoint := range targetGroup.Target {
target := NewTarget(endpoint, job.ScrapeTimeout(), baseLabels)
m.AddTarget(job, target)
}
}
}
}
func (m *targetManager) Stop() {
m.Lock()
defer m.Unlock()
glog.Info("Stopping target manager...")
var wg sync.WaitGroup
for j, p := range m.poolsByJob {
wg.Add(1)
go func(j string, p *TargetPool) {
defer wg.Done()
glog.Infof("Stopping target pool %q...", j)
p.Stop()
glog.Infof("Target pool %q stopped.", j)
}(j, p)
}
wg.Wait()
glog.Info("Target manager stopped.")
}
func (m *targetManager) Pools() map[string]*TargetPool {
m.Lock()
defer m.Unlock()
result := make(map[string]*TargetPool, len(m.poolsByJob))
for k, v := range m.poolsByJob {
result[k] = v
}
return result
}