mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-29 07:29:42 -08:00
106 lines
2.8 KiB
Go
106 lines
2.8 KiB
Go
// Copyright 2015 The Prometheus 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 discovery
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/prometheus/log"
|
|
"github.com/prometheus/prometheus/config"
|
|
"github.com/prometheus/prometheus/retrieval/discovery/marathon"
|
|
)
|
|
|
|
// MarathonDiscovery provides service discovery based on a Marathon instance.
|
|
type MarathonDiscovery struct {
|
|
servers []string
|
|
refreshInterval time.Duration
|
|
done chan struct{}
|
|
lastRefresh map[string]*config.TargetGroup
|
|
client marathon.AppListClient
|
|
}
|
|
|
|
// NewMarathonDiscovery creates a new Marathon based discovery.
|
|
func NewMarathonDiscovery(conf *config.MarathonSDConfig) *MarathonDiscovery {
|
|
return &MarathonDiscovery{
|
|
servers: conf.Servers,
|
|
refreshInterval: time.Duration(conf.RefreshInterval),
|
|
done: make(chan struct{}),
|
|
client: marathon.FetchMarathonApps,
|
|
}
|
|
}
|
|
|
|
// Sources implements the TargetProvider interface.
|
|
func (md *MarathonDiscovery) Sources() []string {
|
|
var sources []string
|
|
tgroups, err := md.fetchTargetGroups()
|
|
if err == nil {
|
|
for source := range tgroups {
|
|
sources = append(sources, source)
|
|
}
|
|
}
|
|
return sources
|
|
}
|
|
|
|
// Run implements the TargetProvider interface.
|
|
func (md *MarathonDiscovery) Run(ch chan<- *config.TargetGroup, done <-chan struct{}) {
|
|
defer close(ch)
|
|
|
|
for {
|
|
select {
|
|
case <-done:
|
|
return
|
|
case <-time.After(md.refreshInterval):
|
|
err := md.updateServices(ch)
|
|
if err != nil {
|
|
log.Errorf("Error while updating services: %s", err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (md *MarathonDiscovery) updateServices(ch chan<- *config.TargetGroup) error {
|
|
targetMap, err := md.fetchTargetGroups()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Update services which are still present
|
|
for _, tg := range targetMap {
|
|
ch <- tg
|
|
}
|
|
|
|
// Remove services which did disappear
|
|
for source := range md.lastRefresh {
|
|
_, ok := targetMap[source]
|
|
if !ok {
|
|
log.Debugf("Removing group for %s", source)
|
|
ch <- &config.TargetGroup{Source: source}
|
|
}
|
|
}
|
|
|
|
md.lastRefresh = targetMap
|
|
return nil
|
|
}
|
|
|
|
func (md *MarathonDiscovery) fetchTargetGroups() (map[string]*config.TargetGroup, error) {
|
|
url := marathon.RandomAppsURL(md.servers)
|
|
apps, err := md.client(url)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
groups := marathon.AppsToTargetGroups(apps)
|
|
return groups, nil
|
|
}
|