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/prometheus/prometheus/config"
"github.com/prometheus/prometheus/model"
"github.com/prometheus/prometheus/retrieval/format"
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"log"
"time"
)
type TargetManager interface {
acquire()
release()
AddTarget(job config.JobConfig, t Target, defaultScrapeInterval time.Duration)
ReplaceTargets(job config.JobConfig, newTargets []Target, defaultScrapeInterval time.Duration)
Remove(t Target)
AddTargetsFromConfig(config config.Config)
Pools() map[string]*TargetPool
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}
type targetManager struct {
requestAllowance chan bool
poolsByJob map[string]*TargetPool
results chan format.Result
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}
func NewTargetManager(results chan format.Result, requestAllowance int) TargetManager {
return &targetManager{
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requestAllowance: make(chan bool, requestAllowance),
results: results,
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, defaultScrapeInterval time.Duration) *TargetPool {
targetPool, ok := m.poolsByJob[job.GetName()]
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if !ok {
targetPool = NewTargetPool(m)
log.Printf("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.results, interval)
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}
return targetPool
}
func (m *targetManager) AddTarget(job config.JobConfig, t Target, defaultScrapeInterval time.Duration) {
targetPool := m.TargetPoolForJob(job, defaultScrapeInterval)
targetPool.AddTarget(t)
m.poolsByJob[job.GetName()] = targetPool
}
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func (m *targetManager) ReplaceTargets(job config.JobConfig, newTargets []Target, defaultScrapeInterval time.Duration) {
targetPool := m.TargetPoolForJob(job, defaultScrapeInterval)
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() {
for _, targetGroup := range job.TargetGroup {
baseLabels := model.LabelSet{
model.JobLabel: model.LabelValue(job.GetName()),
}
if targetGroup.Labels != nil {
for _, label := range targetGroup.Labels.Label {
baseLabels[model.LabelName(label.GetName())] = model.LabelValue(label.GetValue())
}
}
for _, endpoint := range targetGroup.Target {
target := NewTarget(endpoint, time.Second*5, baseLabels)
m.AddTarget(job, target, config.ScrapeInterval())
}
}
}
}
// XXX: Not really thread-safe. Only used in /status page for now.
func (m *targetManager) Pools() map[string]*TargetPool {
return m.poolsByJob
}