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discovery.go
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discovery.go
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// Copyright The OpenTelemetry Authors
//
// 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 target
import (
"github.com/go-logr/logr"
"github.com/mitchellh/hashstructure"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/discovery"
"github.com/prometheus/prometheus/model/relabel"
allocatorWatcher "github.com/open-telemetry/opentelemetry-operator/cmd/otel-allocator/watcher"
)
var (
targetsDiscovered = promauto.NewGaugeVec(prometheus.GaugeOpts{
Name: "opentelemetry_allocator_targets",
Help: "Number of targets discovered.",
}, []string{"job_name"})
)
type Discoverer struct {
log logr.Logger
manager *discovery.Manager
close chan struct{}
configsMap map[allocatorWatcher.EventSource]*config.Config
hook discoveryHook
scrapeConfigsHash uint64
scrapeConfigsUpdater scrapeConfigsUpdater
}
type discoveryHook interface {
SetConfig(map[string][]*relabel.Config)
}
type scrapeConfigsUpdater interface {
UpdateScrapeConfigResponse(map[string]*config.ScrapeConfig) error
}
func NewDiscoverer(log logr.Logger, manager *discovery.Manager, hook discoveryHook, scrapeConfigsUpdater scrapeConfigsUpdater) *Discoverer {
return &Discoverer{
log: log,
manager: manager,
close: make(chan struct{}),
configsMap: make(map[allocatorWatcher.EventSource]*config.Config),
hook: hook,
scrapeConfigsUpdater: scrapeConfigsUpdater,
}
}
func (m *Discoverer) ApplyConfig(source allocatorWatcher.EventSource, cfg *config.Config) error {
if cfg == nil {
m.log.Info("Service Discovery got empty Prometheus config", "source", source.String())
return nil
}
m.configsMap[source] = cfg
jobToScrapeConfig := make(map[string]*config.ScrapeConfig)
discoveryCfg := make(map[string]discovery.Configs)
relabelCfg := make(map[string][]*relabel.Config)
for _, value := range m.configsMap {
for _, scrapeConfig := range value.ScrapeConfigs {
jobToScrapeConfig[scrapeConfig.JobName] = scrapeConfig
discoveryCfg[scrapeConfig.JobName] = scrapeConfig.ServiceDiscoveryConfigs
relabelCfg[scrapeConfig.JobName] = scrapeConfig.RelabelConfigs
}
}
hash, err := hashstructure.Hash(jobToScrapeConfig, nil)
if err != nil {
return err
}
// If the hash has changed, updated stored hash and send the new config.
// Otherwise skip updating scrape configs.
if m.scrapeConfigsUpdater != nil && m.scrapeConfigsHash != hash {
err := m.scrapeConfigsUpdater.UpdateScrapeConfigResponse(jobToScrapeConfig)
if err != nil {
return err
}
m.scrapeConfigsHash = hash
}
if m.hook != nil {
m.hook.SetConfig(relabelCfg)
}
return m.manager.ApplyConfig(discoveryCfg)
}
func (m *Discoverer) Watch(fn func(targets map[string]*Item)) error {
for {
select {
case <-m.close:
m.log.Info("Service Discovery watch event stopped: discovery manager closed")
return nil
case tsets := <-m.manager.SyncCh():
targets := map[string]*Item{}
for jobName, tgs := range tsets {
var count float64 = 0
for _, tg := range tgs {
for _, t := range tg.Targets {
count++
item := NewItem(jobName, string(t[model.AddressLabel]), t.Merge(tg.Labels), "")
targets[item.Hash()] = item
}
}
targetsDiscovered.WithLabelValues(jobName).Set(count)
}
fn(targets)
}
}
}
func (m *Discoverer) Close() {
close(m.close)
}