mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-26 22:19:40 -08:00
144 lines
3.9 KiB
Go
144 lines
3.9 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 (
|
|
"encoding/json"
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/prometheus/common/model"
|
|
"github.com/samuel/go-zookeeper/zk"
|
|
"golang.org/x/net/context"
|
|
|
|
"github.com/prometheus/prometheus/config"
|
|
"github.com/prometheus/prometheus/util/treecache"
|
|
)
|
|
|
|
const (
|
|
nerveLabelPrefix = model.MetaLabelPrefix + "nerve_"
|
|
nervePathLabel = nerveLabelPrefix + "path"
|
|
nerveEndpointLabelPrefix = nerveLabelPrefix + "endpoint"
|
|
)
|
|
|
|
type nerveMember struct {
|
|
Host string `json:"host"`
|
|
Port int `json:"port"`
|
|
Name string `json:"name"`
|
|
}
|
|
|
|
// NerveDiscovery retrieves target information from a Nerve server
|
|
// and updates them via watches.
|
|
type NerveDiscovery struct {
|
|
conf *config.NerveSDConfig
|
|
conn *zk.Conn
|
|
mu sync.RWMutex
|
|
sources map[string]*config.TargetGroup
|
|
sdUpdates *chan<- []*config.TargetGroup
|
|
updates chan treecache.ZookeeperTreeCacheEvent
|
|
treeCaches []*treecache.ZookeeperTreeCache
|
|
}
|
|
|
|
// NewNerveDiscovery returns a new NerveDiscovery for the given config.
|
|
func NewNerveDiscovery(conf *config.NerveSDConfig) *NerveDiscovery {
|
|
conn, _, err := zk.Connect(conf.Servers, time.Duration(conf.Timeout))
|
|
conn.SetLogger(treecache.ZookeeperLogger{})
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
updates := make(chan treecache.ZookeeperTreeCacheEvent)
|
|
sd := &NerveDiscovery{
|
|
conf: conf,
|
|
conn: conn,
|
|
updates: updates,
|
|
sources: map[string]*config.TargetGroup{},
|
|
}
|
|
go sd.processUpdates()
|
|
for _, path := range conf.Paths {
|
|
sd.treeCaches = append(sd.treeCaches, treecache.NewZookeeperTreeCache(conn, path, updates))
|
|
}
|
|
return sd
|
|
}
|
|
|
|
func (sd *NerveDiscovery) processUpdates() {
|
|
defer sd.conn.Close()
|
|
for event := range sd.updates {
|
|
tg := &config.TargetGroup{
|
|
Source: event.Path,
|
|
}
|
|
sd.mu.Lock()
|
|
if event.Data != nil {
|
|
labelSet, err := parseNerveMember(*event.Data, event.Path)
|
|
if err == nil {
|
|
tg.Targets = []model.LabelSet{*labelSet}
|
|
sd.sources[event.Path] = tg
|
|
} else {
|
|
delete(sd.sources, event.Path)
|
|
}
|
|
} else {
|
|
delete(sd.sources, event.Path)
|
|
}
|
|
sd.mu.Unlock()
|
|
if sd.sdUpdates != nil {
|
|
*sd.sdUpdates <- []*config.TargetGroup{tg}
|
|
}
|
|
}
|
|
|
|
if sd.sdUpdates != nil {
|
|
close(*sd.sdUpdates)
|
|
}
|
|
}
|
|
|
|
// Run implements the TargetProvider interface.
|
|
func (sd *NerveDiscovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
|
|
// Send on everything we have seen so far.
|
|
sd.mu.Lock()
|
|
|
|
all := make([]*config.TargetGroup, 0, len(sd.sources))
|
|
|
|
for _, tg := range sd.sources {
|
|
all = append(all, tg)
|
|
}
|
|
ch <- all
|
|
|
|
// Tell processUpdates to send future updates.
|
|
sd.sdUpdates = &ch
|
|
sd.mu.Unlock()
|
|
|
|
<-ctx.Done()
|
|
for _, tc := range sd.treeCaches {
|
|
tc.Stop()
|
|
}
|
|
}
|
|
|
|
func parseNerveMember(data []byte, path string) (*model.LabelSet, error) {
|
|
member := nerveMember{}
|
|
err := json.Unmarshal(data, &member)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error unmarshaling nerve member %q: %s", path, err)
|
|
}
|
|
|
|
labels := model.LabelSet{}
|
|
labels[nervePathLabel] = model.LabelValue(path)
|
|
labels[model.AddressLabel] = model.LabelValue(
|
|
fmt.Sprintf("%s:%d", member.Host, member.Port))
|
|
|
|
labels[nerveEndpointLabelPrefix+"_host"] = model.LabelValue(member.Host)
|
|
labels[nerveEndpointLabelPrefix+"_port"] = model.LabelValue(fmt.Sprintf("%d", member.Port))
|
|
labels[nerveEndpointLabelPrefix+"_name"] = model.LabelValue(member.Name)
|
|
|
|
return &labels, nil
|
|
}
|