153 lines
4.0 KiB
Go
153 lines
4.0 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package retrieval
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import (
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"sync"
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"github.com/golang/glog"
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/storage"
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)
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// TargetManager manages all scrape targets. All methods are goroutine-safe.
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type TargetManager interface {
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AddTarget(job config.JobConfig, t Target)
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ReplaceTargets(job config.JobConfig, newTargets []Target)
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Remove(t Target)
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AddTargetsFromConfig(config config.Config)
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Stop()
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Pools() map[string]*TargetPool // Returns a copy of the name -> TargetPool mapping.
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}
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type targetManager struct {
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sync.Mutex // Protects poolByJob.
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globalLabels clientmodel.LabelSet
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sampleAppender storage.SampleAppender
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poolsByJob map[string]*TargetPool
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}
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// NewTargetManager returns a newly initialized TargetManager ready to use.
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func NewTargetManager(sampleAppender storage.SampleAppender, globalLabels clientmodel.LabelSet) TargetManager {
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return &targetManager{
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sampleAppender: sampleAppender,
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globalLabels: globalLabels,
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poolsByJob: make(map[string]*TargetPool),
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}
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}
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func (m *targetManager) targetPoolForJob(job config.JobConfig) *TargetPool {
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targetPool, ok := m.poolsByJob[job.GetName()]
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if !ok {
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var provider TargetProvider
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if job.SdName != nil {
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provider = NewSdTargetProvider(job, m.globalLabels)
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}
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interval := job.ScrapeInterval()
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targetPool = NewTargetPool(provider, m.sampleAppender, interval)
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glog.Infof("Pool for job %s does not exist; creating and starting...", job.GetName())
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m.poolsByJob[job.GetName()] = targetPool
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go targetPool.Run()
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}
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return targetPool
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}
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func (m *targetManager) AddTarget(job config.JobConfig, t Target) {
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m.Lock()
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defer m.Unlock()
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targetPool := m.targetPoolForJob(job)
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targetPool.AddTarget(t)
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m.poolsByJob[job.GetName()] = targetPool
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}
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func (m *targetManager) ReplaceTargets(job config.JobConfig, newTargets []Target) {
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m.Lock()
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defer m.Unlock()
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targetPool := m.targetPoolForJob(job)
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targetPool.ReplaceTargets(newTargets)
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}
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func (m *targetManager) Remove(t Target) {
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panic("not implemented")
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}
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func (m *targetManager) AddTargetsFromConfig(config config.Config) {
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for _, job := range config.Jobs() {
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if job.SdName != nil {
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m.Lock()
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m.targetPoolForJob(job)
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m.Unlock()
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continue
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}
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for _, targetGroup := range job.TargetGroup {
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baseLabels := clientmodel.LabelSet{
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clientmodel.JobLabel: clientmodel.LabelValue(job.GetName()),
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}
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for n, v := range m.globalLabels {
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baseLabels[n] = v
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}
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if targetGroup.Labels != nil {
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for _, label := range targetGroup.Labels.Label {
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baseLabels[clientmodel.LabelName(label.GetName())] = clientmodel.LabelValue(label.GetValue())
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}
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}
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for _, endpoint := range targetGroup.Target {
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target := NewTarget(endpoint, job.ScrapeTimeout(), baseLabels)
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m.AddTarget(job, target)
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}
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}
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}
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}
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func (m *targetManager) Stop() {
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m.Lock()
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defer m.Unlock()
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glog.Info("Stopping target manager...")
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var wg sync.WaitGroup
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for j, p := range m.poolsByJob {
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wg.Add(1)
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go func(j string, p *TargetPool) {
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defer wg.Done()
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glog.Infof("Stopping target pool %q...", j)
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p.Stop()
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glog.Infof("Target pool %q stopped.", j)
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}(j, p)
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}
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wg.Wait()
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glog.Info("Target manager stopped.")
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}
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func (m *targetManager) Pools() map[string]*TargetPool {
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m.Lock()
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defer m.Unlock()
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result := make(map[string]*TargetPool, len(m.poolsByJob))
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for k, v := range m.poolsByJob {
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result[k] = v
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}
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return result
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}
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