99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
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package discovery
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import (
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"time"
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"github.com/prometheus/log"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/retrieval/discovery/marathon"
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)
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// MarathonDiscovery provides service discovery based on a Marathon instance.
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type MarathonDiscovery struct {
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servers []string
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refreshInterval time.Duration
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done chan struct{}
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lastRefresh map[string]*config.TargetGroup
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client marathon.AppListClient
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}
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// NewMarathonDiscovery creates a new Marathon based discovery.
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func NewMarathonDiscovery(conf *config.MarathonSDConfig) *MarathonDiscovery {
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return &MarathonDiscovery{
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servers: conf.Servers,
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refreshInterval: time.Duration(conf.RefreshInterval),
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done: make(chan struct{}),
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client: marathon.FetchMarathonApps,
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}
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}
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// Sources implements the TargetProvider interface.
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func (md *MarathonDiscovery) Sources() []string {
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var sources []string
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tgroups, err := md.fetchTargetGroups()
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if err == nil {
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for source := range tgroups {
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sources = append(sources, source)
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}
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}
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return sources
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}
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// Run implements the TargetProvider interface.
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func (md *MarathonDiscovery) Run(ch chan<- *config.TargetGroup) {
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defer close(ch)
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for {
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select {
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case <-md.done:
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log.Debug("Shutting down marathon discovery.")
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return
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case <-time.After(md.refreshInterval):
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err := md.updateServices(ch)
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if err != nil {
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log.Errorf("Error while updating services: %s", err)
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}
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}
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}
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}
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// Stop implements the TargetProvider interface.
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func (md *MarathonDiscovery) Stop() {
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md.done <- struct{}{}
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}
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func (md *MarathonDiscovery) updateServices(ch chan<- *config.TargetGroup) error {
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targetMap, err := md.fetchTargetGroups()
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if err != nil {
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return err
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}
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// Update services which are still present
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for _, tg := range targetMap {
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ch <- tg
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}
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// Remove services which did disappear
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for source := range md.lastRefresh {
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_, ok := targetMap[source]
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if !ok {
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log.Debugf("Removing group for %s", source)
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ch <- &config.TargetGroup{Source: source}
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}
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}
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md.lastRefresh = targetMap
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return nil
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}
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func (md *MarathonDiscovery) fetchTargetGroups() (map[string]*config.TargetGroup, error) {
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url := marathon.RandomAppsURL(md.servers)
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apps, err := md.client(url)
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if err != nil {
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return nil, err
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}
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groups := marathon.AppsToTargetGroups(apps)
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return groups, nil
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}
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