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https://github.com/prometheus/prometheus.git
synced 2024-11-10 07:34:04 -08:00
d88aea7e6f
The prefixed target provider changed a pointerized target group that was reused in the wrapped target provider, causing an ever-increasing chain of source prefixes in target groups from the Consul target provider. We now make this bug generally impossible by switching the target group channel from pointer to value type and thus ensuring that target groups are copied before being passed on to other parts of the system. I tried to not let the depointerization leak too far outside of the channel handling (both upstream and downstream) because I tried that initially and caused some nasty bugs, which I want to minimize. Fixes https://github.com/prometheus/prometheus/issues/1083
106 lines
2.8 KiB
Go
106 lines
2.8 KiB
Go
// Copyright 2015 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 discovery
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import (
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"time"
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"github.com/prometheus/common/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, done <-chan struct{}) {
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defer close(ch)
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for {
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select {
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case <-done:
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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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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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