mirror of
https://github.com/prometheus/prometheus
synced 2024-12-26 00:23:18 +00:00
discovery: move consul SD into own package
This commit is contained in:
Fabian Reinartz
parent
25775b3583
commit
5837e6a97f
@ -1,4 +1,4 @@
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// Copyright 2015 The Prometheus Authors
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// Copyright 2016 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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@ -14,257 +14,10 @@
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package discovery
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import (
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"fmt"
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"strconv"
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"strings"
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"sync"
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"time"
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consul "github.com/hashicorp/consul/api"
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"github.com/prometheus/common/log"
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"github.com/prometheus/common/model"
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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/retrieval/discovery/consul"
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)
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const (
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consulWatchTimeout = 30 * time.Second
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consulRetryInterval = 15 * time.Second
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// consulAddressLabel is the name for the label containing a target's address.
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consulAddressLabel = model.MetaLabelPrefix + "consul_address"
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// consulNodeLabel is the name for the label containing a target's node name.
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consulNodeLabel = model.MetaLabelPrefix + "consul_node"
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// consulTagsLabel is the name of the label containing the tags assigned to the target.
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consulTagsLabel = model.MetaLabelPrefix + "consul_tags"
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// consulServiceLabel is the name of the label containing the service name.
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consulServiceLabel = model.MetaLabelPrefix + "consul_service"
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// consulServiceAddressLabel is the name of the label containing the (optional) service address.
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consulServiceAddressLabel = model.MetaLabelPrefix + "consul_service_address"
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// consulServicePortLabel is the name of the label containing the service port.
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consulServicePortLabel = model.MetaLabelPrefix + "consul_service_port"
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// consulDCLabel is the name of the label containing the datacenter ID.
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consulDCLabel = model.MetaLabelPrefix + "consul_dc"
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// consulServiceIDLabel is the name of the label containing the service ID.
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consulServiceIDLabel = model.MetaLabelPrefix + "consul_service_id"
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)
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// ConsulDiscovery retrieves target information from a Consul server
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// and updates them via watches.
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type ConsulDiscovery struct {
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client *consul.Client
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clientConf *consul.Config
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clientDatacenter string
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tagSeparator string
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scrapedServices map[string]struct{}
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mu sync.RWMutex
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services map[string]*consulService
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}
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// consulService contains data belonging to the same service.
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type consulService struct {
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name string
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tgroup config.TargetGroup
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lastIndex uint64
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removed bool
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running bool
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done chan struct{}
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}
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// NewConsulDiscovery returns a new ConsulDiscovery for the given config.
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func NewConsulDiscovery(conf *config.ConsulSDConfig) (*ConsulDiscovery, error) {
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clientConf := &consul.Config{
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Address: conf.Server,
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Scheme: conf.Scheme,
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Datacenter: conf.Datacenter,
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Token: conf.Token,
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HttpAuth: &consul.HttpBasicAuth{
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Username: conf.Username,
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Password: conf.Password,
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},
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}
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client, err := consul.NewClient(clientConf)
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if err != nil {
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return nil, err
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}
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cd := &ConsulDiscovery{
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client: client,
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clientConf: clientConf,
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tagSeparator: conf.TagSeparator,
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scrapedServices: map[string]struct{}{},
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services: map[string]*consulService{},
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}
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// If the datacenter isn't set in the clientConf, let's get it from the local Consul agent
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// (Consul default is to use local node's datacenter if one isn't given for a query).
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if clientConf.Datacenter == "" {
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info, err := client.Agent().Self()
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if err != nil {
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return nil, err
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}
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cd.clientDatacenter = info["Config"]["Datacenter"].(string)
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} else {
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cd.clientDatacenter = clientConf.Datacenter
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}
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for _, name := range conf.Services {
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cd.scrapedServices[name] = struct{}{}
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}
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return cd, nil
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}
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// Run implements the TargetProvider interface.
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func (cd *ConsulDiscovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
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defer close(ch)
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defer cd.stop()
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update := make(chan *consulService, 10)
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go cd.watchServices(update, ctx.Done())
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for {
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select {
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case <-ctx.Done():
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return
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case srv := <-update:
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if srv.removed {
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close(srv.done)
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// Send clearing update.
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ch <- []*config.TargetGroup{{Source: srv.name}}
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break
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}
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// Launch watcher for the service.
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if !srv.running {
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go cd.watchService(srv, ch)
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srv.running = true
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}
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}
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}
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}
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func (cd *ConsulDiscovery) stop() {
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// The lock prevents Run from terminating while the watchers attempt
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// to send on their channels.
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cd.mu.Lock()
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defer cd.mu.Unlock()
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for _, srv := range cd.services {
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close(srv.done)
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}
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}
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// watchServices retrieves updates from Consul's services endpoint and sends
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// potential updates to the update channel.
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func (cd *ConsulDiscovery) watchServices(update chan<- *consulService, done <-chan struct{}) {
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var lastIndex uint64
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for {
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catalog := cd.client.Catalog()
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srvs, meta, err := catalog.Services(&consul.QueryOptions{
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WaitIndex: lastIndex,
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WaitTime: consulWatchTimeout,
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})
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if err != nil {
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log.Errorf("Error refreshing service list: %s", err)
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time.Sleep(consulRetryInterval)
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continue
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}
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// If the index equals the previous one, the watch timed out with no update.
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if meta.LastIndex == lastIndex {
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continue
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}
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lastIndex = meta.LastIndex
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cd.mu.Lock()
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select {
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case <-done:
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cd.mu.Unlock()
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return
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default:
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// Continue.
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}
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// Check for new services.
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for name := range srvs {
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if _, ok := cd.scrapedServices[name]; len(cd.scrapedServices) > 0 && !ok {
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continue
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}
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srv, ok := cd.services[name]
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if !ok {
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srv = &consulService{
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name: name,
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done: make(chan struct{}),
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}
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srv.tgroup.Source = name
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cd.services[name] = srv
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}
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srv.tgroup.Labels = model.LabelSet{
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consulServiceLabel: model.LabelValue(name),
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consulDCLabel: model.LabelValue(cd.clientDatacenter),
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}
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update <- srv
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}
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// Check for removed services.
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for name, srv := range cd.services {
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if _, ok := srvs[name]; !ok {
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srv.removed = true
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update <- srv
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delete(cd.services, name)
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}
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}
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cd.mu.Unlock()
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}
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}
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// watchService retrieves updates about srv from Consul's service endpoint.
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// On a potential update the resulting target group is sent to ch.
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func (cd *ConsulDiscovery) watchService(srv *consulService, ch chan<- []*config.TargetGroup) {
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catalog := cd.client.Catalog()
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for {
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nodes, meta, err := catalog.Service(srv.name, "", &consul.QueryOptions{
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WaitIndex: srv.lastIndex,
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WaitTime: consulWatchTimeout,
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})
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if err != nil {
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log.Errorf("Error refreshing service %s: %s", srv.name, err)
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time.Sleep(consulRetryInterval)
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continue
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}
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// If the index equals the previous one, the watch timed out with no update.
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if meta.LastIndex == srv.lastIndex {
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continue
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}
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srv.lastIndex = meta.LastIndex
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srv.tgroup.Targets = make([]model.LabelSet, 0, len(nodes))
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for _, node := range nodes {
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addr := fmt.Sprintf("%s:%d", node.Address, node.ServicePort)
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// We surround the separated list with the separator as well. This way regular expressions
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// in relabeling rules don't have to consider tag positions.
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tags := cd.tagSeparator + strings.Join(node.ServiceTags, cd.tagSeparator) + cd.tagSeparator
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srv.tgroup.Targets = append(srv.tgroup.Targets, model.LabelSet{
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model.AddressLabel: model.LabelValue(addr),
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consulAddressLabel: model.LabelValue(node.Address),
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consulNodeLabel: model.LabelValue(node.Node),
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consulTagsLabel: model.LabelValue(tags),
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consulServiceAddressLabel: model.LabelValue(node.ServiceAddress),
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consulServicePortLabel: model.LabelValue(strconv.Itoa(node.ServicePort)),
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consulServiceIDLabel: model.LabelValue(node.ServiceID),
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})
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}
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cd.mu.Lock()
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select {
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case <-srv.done:
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cd.mu.Unlock()
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return
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default:
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// Continue.
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}
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// TODO(fabxc): do a copy for now to avoid races. The integration
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// needs needs some general cleanup.
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tg := srv.tgroup
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ch <- []*config.TargetGroup{&tg}
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cd.mu.Unlock()
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}
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func NewConsul(cfg *config.ConsulSDConfig) (*consul.Discovery, error) {
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return nil, nil
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}
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270
retrieval/discovery/consul/consul.go
Normal file
270
retrieval/discovery/consul/consul.go
Normal file
@ -0,0 +1,270 @@
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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 consul
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import (
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"fmt"
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"strconv"
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"strings"
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"sync"
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"time"
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consul "github.com/hashicorp/consul/api"
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"github.com/prometheus/common/log"
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"github.com/prometheus/common/model"
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"golang.org/x/net/context"
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"github.com/prometheus/prometheus/config"
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)
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const (
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watchTimeout = 30 * time.Second
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retryInterval = 15 * time.Second
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// addressLabel is the name for the label containing a target's address.
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addressLabel = model.MetaLabelPrefix + "consul_address"
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// nodeLabel is the name for the label containing a target's node name.
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nodeLabel = model.MetaLabelPrefix + "consul_node"
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// tagsLabel is the name of the label containing the tags assigned to the target.
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tagsLabel = model.MetaLabelPrefix + "consul_tags"
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// serviceLabel is the name of the label containing the service name.
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serviceLabel = model.MetaLabelPrefix + "consul_service"
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// serviceAddressLabel is the name of the label containing the (optional) service address.
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serviceAddressLabel = model.MetaLabelPrefix + "consul_service_address"
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//servicePortLabel is the name of the label containing the service port.
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servicePortLabel = model.MetaLabelPrefix + "consul_service_port"
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// datacenterLabel is the name of the label containing the datacenter ID.
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datacenterLabel = model.MetaLabelPrefix + "consul_dc"
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// serviceIDLabel is the name of the label containing the service ID.
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serviceIDLabel = model.MetaLabelPrefix + "consul_service_id"
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)
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// Discovery retrieves target information from a Consul server
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// and updates them via watches.
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type Discovery struct {
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client *consul.Client
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clientConf *consul.Config
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clientDatacenter string
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tagSeparator string
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scrapedServices map[string]struct{}
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mu sync.RWMutex
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services map[string]*consulService
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}
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// consulService contains data belonging to the same service.
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type consulService struct {
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name string
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tgroup config.TargetGroup
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lastIndex uint64
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removed bool
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running bool
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done chan struct{}
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}
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// NewDiscovery returns a new Discovery for the given config.
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func NewDiscovery(conf *config.ConsulSDConfig) (*Discovery, error) {
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clientConf := &consul.Config{
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Address: conf.Server,
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Scheme: conf.Scheme,
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Datacenter: conf.Datacenter,
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Token: conf.Token,
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HttpAuth: &consul.HttpBasicAuth{
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Username: conf.Username,
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Password: conf.Password,
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},
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}
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client, err := consul.NewClient(clientConf)
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if err != nil {
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return nil, err
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}
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cd := &Discovery{
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client: client,
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clientConf: clientConf,
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tagSeparator: conf.TagSeparator,
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scrapedServices: map[string]struct{}{},
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services: map[string]*consulService{},
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}
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// If the datacenter isn't set in the clientConf, let's get it from the local Consul agent
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// (Consul default is to use local node's datacenter if one isn't given for a query).
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if clientConf.Datacenter == "" {
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info, err := client.Agent().Self()
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if err != nil {
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return nil, err
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}
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cd.clientDatacenter = info["Config"]["Datacenter"].(string)
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} else {
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cd.clientDatacenter = clientConf.Datacenter
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}
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for _, name := range conf.Services {
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cd.scrapedServices[name] = struct{}{}
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}
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return cd, nil
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}
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// Run implements the TargetProvider interface.
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func (cd *Discovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
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defer close(ch)
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defer cd.stop()
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update := make(chan *consulService, 10)
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go cd.watchServices(update, ctx.Done())
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for {
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select {
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case <-ctx.Done():
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return
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case srv := <-update:
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if srv.removed {
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close(srv.done)
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// Send clearing update.
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ch <- []*config.TargetGroup{{Source: srv.name}}
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break
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}
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// Launch watcher for the service.
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if !srv.running {
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go cd.watchService(srv, ch)
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srv.running = true
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}
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}
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}
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}
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func (cd *Discovery) stop() {
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// The lock prevents Run from terminating while the watchers attempt
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// to send on their channels.
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cd.mu.Lock()
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defer cd.mu.Unlock()
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for _, srv := range cd.services {
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close(srv.done)
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}
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}
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// watchServices retrieves updates from Consul's services endpoint and sends
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// potential updates to the update channel.
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func (cd *Discovery) watchServices(update chan<- *consulService, done <-chan struct{}) {
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var lastIndex uint64
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for {
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catalog := cd.client.Catalog()
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srvs, meta, err := catalog.Services(&consul.QueryOptions{
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WaitIndex: lastIndex,
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WaitTime: watchTimeout,
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})
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if err != nil {
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log.Errorf("Error refreshing service list: %s", err)
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time.Sleep(retryInterval)
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continue
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}
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// If the index equals the previous one, the watch timed out with no update.
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if meta.LastIndex == lastIndex {
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continue
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}
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lastIndex = meta.LastIndex
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cd.mu.Lock()
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select {
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case <-done:
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cd.mu.Unlock()
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return
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default:
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// Continue.
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}
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// Check for new services.
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for name := range srvs {
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if _, ok := cd.scrapedServices[name]; len(cd.scrapedServices) > 0 && !ok {
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continue
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}
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srv, ok := cd.services[name]
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if !ok {
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srv = &consulService{
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name: name,
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done: make(chan struct{}),
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}
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srv.tgroup.Source = name
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cd.services[name] = srv
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}
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srv.tgroup.Labels = model.LabelSet{
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serviceLabel: model.LabelValue(name),
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datacenterLabel: model.LabelValue(cd.clientDatacenter),
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}
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update <- srv
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}
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// Check for removed services.
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for name, srv := range cd.services {
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if _, ok := srvs[name]; !ok {
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srv.removed = true
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update <- srv
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delete(cd.services, name)
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}
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}
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cd.mu.Unlock()
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}
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}
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// watchService retrieves updates about srv from Consul's service endpoint.
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// On a potential update the resulting target group is sent to ch.
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func (cd *Discovery) watchService(srv *consulService, ch chan<- []*config.TargetGroup) {
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catalog := cd.client.Catalog()
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for {
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nodes, meta, err := catalog.Service(srv.name, "", &consul.QueryOptions{
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WaitIndex: srv.lastIndex,
|
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WaitTime: watchTimeout,
|
||||
})
|
||||
if err != nil {
|
||||
log.Errorf("Error refreshing service %s: %s", srv.name, err)
|
||||
time.Sleep(retryInterval)
|
||||
continue
|
||||
}
|
||||
// If the index equals the previous one, the watch timed out with no update.
|
||||
if meta.LastIndex == srv.lastIndex {
|
||||
continue
|
||||
}
|
||||
srv.lastIndex = meta.LastIndex
|
||||
srv.tgroup.Targets = make([]model.LabelSet, 0, len(nodes))
|
||||
|
||||
for _, node := range nodes {
|
||||
addr := fmt.Sprintf("%s:%d", node.Address, node.ServicePort)
|
||||
// We surround the separated list with the separator as well. This way regular expressions
|
||||
// in relabeling rules don't have to consider tag positions.
|
||||
tags := cd.tagSeparator + strings.Join(node.ServiceTags, cd.tagSeparator) + cd.tagSeparator
|
||||
|
||||
srv.tgroup.Targets = append(srv.tgroup.Targets, model.LabelSet{
|
||||
model.AddressLabel: model.LabelValue(addr),
|
||||
addressLabel: model.LabelValue(node.Address),
|
||||
nodeLabel: model.LabelValue(node.Node),
|
||||
tagsLabel: model.LabelValue(tags),
|
||||
serviceAddressLabel: model.LabelValue(node.ServiceAddress),
|
||||
servicePortLabel: model.LabelValue(strconv.Itoa(node.ServicePort)),
|
||||
serviceIDLabel: model.LabelValue(node.ServiceID),
|
||||
})
|
||||
}
|
||||
|
||||
cd.mu.Lock()
|
||||
select {
|
||||
case <-srv.done:
|
||||
cd.mu.Unlock()
|
||||
return
|
||||
default:
|
||||
// Continue.
|
||||
}
|
||||
// TODO(fabxc): do a copy for now to avoid races. The integration
|
||||
// needs needs some general cleanup.
|
||||
tg := srv.tgroup
|
||||
ch <- []*config.TargetGroup{&tg}
|
||||
|
||||
cd.mu.Unlock()
|
||||
}
|
||||
}
|
||||
@ -366,7 +366,7 @@ func providersFromConfig(cfg *config.ScrapeConfig) map[string]TargetProvider {
|
||||
app("file", i, discovery.NewFileDiscovery(c))
|
||||
}
|
||||
for i, c := range cfg.ConsulSDConfigs {
|
||||
k, err := discovery.NewConsulDiscovery(c)
|
||||
k, err := discovery.NewConsul(c)
|
||||
if err != nil {
|
||||
log.Errorf("Cannot create Consul discovery: %s", err)
|
||||
continue
|
||||
|
||||
Loading…
Reference in New Issue
Block a user