mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-26 06:04:05 -08:00
130 lines
3.5 KiB
Go
130 lines
3.5 KiB
Go
// Copyright 2013 Prometheus Team
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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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"github.com/golang/glog"
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"github.com/prometheus/client_golang/extraction"
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/config"
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)
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type TargetManager interface {
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acquire()
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release()
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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
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}
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type targetManager struct {
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requestAllowance chan bool
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poolsByJob map[string]*TargetPool
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ingester extraction.Ingester
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}
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func NewTargetManager(ingester extraction.Ingester, requestAllowance int) TargetManager {
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return &targetManager{
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requestAllowance: make(chan bool, requestAllowance),
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ingester: ingester,
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poolsByJob: make(map[string]*TargetPool),
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}
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}
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func (m *targetManager) acquire() {
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m.requestAllowance <- true
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}
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func (m *targetManager) release() {
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<-m.requestAllowance
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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 = nil
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if job.SdName != nil {
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provider = NewSdTargetProvider(job)
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}
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targetPool = NewTargetPool(m, provider)
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glog.Infof("Pool for job %s does not exist; creating and starting...", job.GetName())
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interval := job.ScrapeInterval()
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m.poolsByJob[job.GetName()] = targetPool
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// BUG(all): Investigate whether this auto-goroutine creation is desired.
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go targetPool.Run(m.ingester, interval)
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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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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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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.TargetPoolForJob(job)
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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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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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glog.Info("Target manager exiting...")
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for _, p := range m.poolsByJob {
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p.Stop()
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}
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}
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// XXX: Not really thread-safe. Only used in /status page for now.
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func (m *targetManager) Pools() map[string]*TargetPool {
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return m.poolsByJob
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}
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