mirror of https://github.com/prometheus/prometheus
Fabian Reinartz
8 years ago
parent
b4d7ce1370
commit
a1eec447a4
@ -1,144 +0,0 @@
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// 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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"encoding/json"
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"fmt"
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"net"
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"sync"
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"time"
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"github.com/prometheus/common/model"
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"github.com/samuel/go-zookeeper/zk"
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"golang.org/x/net/context"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/util/treecache"
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)
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const (
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nerveLabelPrefix = model.MetaLabelPrefix + "nerve_"
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nervePathLabel = nerveLabelPrefix + "path"
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nerveEndpointLabelPrefix = nerveLabelPrefix + "endpoint"
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)
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type nerveMember struct {
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Host string `json:"host"`
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Port int `json:"port"`
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Name string `json:"name"`
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}
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// NerveDiscovery retrieves target information from a Nerve server
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// and updates them via watches.
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type NerveDiscovery struct {
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conf *config.NerveSDConfig
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conn *zk.Conn
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mu sync.RWMutex
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sources map[string]*config.TargetGroup
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sdUpdates *chan<- []*config.TargetGroup
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updates chan treecache.ZookeeperTreeCacheEvent
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treeCaches []*treecache.ZookeeperTreeCache
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}
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// NewNerveDiscovery returns a new NerveDiscovery for the given config.
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func NewNerveDiscovery(conf *config.NerveSDConfig) *NerveDiscovery {
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conn, _, err := zk.Connect(conf.Servers, time.Duration(conf.Timeout))
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conn.SetLogger(treecache.ZookeeperLogger{})
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if err != nil {
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return nil
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}
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updates := make(chan treecache.ZookeeperTreeCacheEvent)
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sd := &NerveDiscovery{
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conf: conf,
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conn: conn,
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updates: updates,
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sources: map[string]*config.TargetGroup{},
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}
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go sd.processUpdates()
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for _, path := range conf.Paths {
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sd.treeCaches = append(sd.treeCaches, treecache.NewZookeeperTreeCache(conn, path, updates))
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}
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return sd
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}
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func (sd *NerveDiscovery) processUpdates() {
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defer sd.conn.Close()
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for event := range sd.updates {
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tg := &config.TargetGroup{
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Source: event.Path,
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}
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sd.mu.Lock()
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if event.Data != nil {
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labelSet, err := parseNerveMember(*event.Data, event.Path)
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if err == nil {
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tg.Targets = []model.LabelSet{*labelSet}
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sd.sources[event.Path] = tg
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} else {
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delete(sd.sources, event.Path)
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}
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} else {
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delete(sd.sources, event.Path)
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}
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sd.mu.Unlock()
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if sd.sdUpdates != nil {
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*sd.sdUpdates <- []*config.TargetGroup{tg}
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}
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}
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if sd.sdUpdates != nil {
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close(*sd.sdUpdates)
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}
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}
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// Run implements the TargetProvider interface.
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func (sd *NerveDiscovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
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// Send on everything we have seen so far.
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sd.mu.Lock()
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all := make([]*config.TargetGroup, 0, len(sd.sources))
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for _, tg := range sd.sources {
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all = append(all, tg)
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}
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ch <- all
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// Tell processUpdates to send future updates.
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sd.sdUpdates = &ch
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sd.mu.Unlock()
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<-ctx.Done()
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for _, tc := range sd.treeCaches {
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tc.Stop()
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}
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}
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func parseNerveMember(data []byte, path string) (*model.LabelSet, error) {
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member := nerveMember{}
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err := json.Unmarshal(data, &member)
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if err != nil {
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return nil, fmt.Errorf("error unmarshaling nerve member %q: %s", path, err)
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}
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labels := model.LabelSet{}
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labels[nervePathLabel] = model.LabelValue(path)
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labels[model.AddressLabel] = model.LabelValue(
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net.JoinHostPort(member.Host, fmt.Sprintf("%d", member.Port)))
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labels[nerveEndpointLabelPrefix+"_host"] = model.LabelValue(member.Host)
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labels[nerveEndpointLabelPrefix+"_port"] = model.LabelValue(fmt.Sprintf("%d", member.Port))
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labels[nerveEndpointLabelPrefix+"_name"] = model.LabelValue(member.Name)
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return &labels, nil
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}
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