prometheus/retrieval/targetmanager.go

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// Copyright 2013 Prometheus Team
// 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 (
"github.com/golang/glog"
"github.com/prometheus/client_golang/extraction"
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/config"
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)
type TargetManager interface {
acquire()
release()
AddTarget(job config.JobConfig, t Target)
ReplaceTargets(job config.JobConfig, newTargets []Target)
Remove(t Target)
AddTargetsFromConfig(config config.Config)
Stop()
Pools() map[string]*TargetPool
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}
type targetManager struct {
requestAllowance chan bool
poolsByJob map[string]*TargetPool
ingester extraction.Ingester
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}
func NewTargetManager(ingester extraction.Ingester, requestAllowance int) TargetManager {
return &targetManager{
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requestAllowance: make(chan bool, requestAllowance),
ingester: ingester,
poolsByJob: make(map[string]*TargetPool),
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}
}
func (m *targetManager) acquire() {
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m.requestAllowance <- true
}
func (m *targetManager) release() {
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<-m.requestAllowance
}
func (m *targetManager) TargetPoolForJob(job config.JobConfig) *TargetPool {
targetPool, ok := m.poolsByJob[job.GetName()]
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if !ok {
var provider TargetProvider = nil
if job.SdName != nil {
provider = NewSdTargetProvider(job)
}
targetPool = NewTargetPool(m, provider)
glog.Infof("Pool for job %s does not exist; creating and starting...", job.GetName())
interval := job.ScrapeInterval()
m.poolsByJob[job.GetName()] = targetPool
// BUG(all): Investigate whether this auto-goroutine creation is desired.
go targetPool.Run(m.ingester, interval)
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}
return targetPool
}
func (m *targetManager) AddTarget(job config.JobConfig, t Target) {
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) {
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.TargetPoolForJob(job)
continue
}
for _, targetGroup := range job.TargetGroup {
baseLabels := clientmodel.LabelSet{
clientmodel.JobLabel: clientmodel.LabelValue(job.GetName()),
}
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() {
glog.Info("Target manager exiting...")
for _, p := range m.poolsByJob {
p.Stop()
}
}
// XXX: Not really thread-safe. Only used in /status page for now.
func (m *targetManager) Pools() map[string]*TargetPool {
return m.poolsByJob
}