366 lines
11 KiB
Go
366 lines
11 KiB
Go
// 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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//
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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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"context"
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"fmt"
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"reflect"
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"sync"
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"time"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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sd_config "github.com/prometheus/prometheus/discovery/config"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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"github.com/prometheus/prometheus/discovery/azure"
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"github.com/prometheus/prometheus/discovery/consul"
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"github.com/prometheus/prometheus/discovery/dns"
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"github.com/prometheus/prometheus/discovery/ec2"
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"github.com/prometheus/prometheus/discovery/file"
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"github.com/prometheus/prometheus/discovery/gce"
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"github.com/prometheus/prometheus/discovery/kubernetes"
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"github.com/prometheus/prometheus/discovery/marathon"
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"github.com/prometheus/prometheus/discovery/openstack"
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"github.com/prometheus/prometheus/discovery/triton"
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"github.com/prometheus/prometheus/discovery/zookeeper"
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)
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var (
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failedConfigs = prometheus.NewCounter(
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prometheus.CounterOpts{
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Name: "prometheus_sd_configs_failed_total",
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Help: "Total number of service discovery configurations that failed to load.",
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},
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)
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)
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func init() {
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prometheus.MustRegister(failedConfigs)
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}
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// Discoverer provides information about target groups. It maintains a set
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// of sources from which TargetGroups can originate. Whenever a discovery provider
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// detects a potential change, it sends the TargetGroup through its channel.
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//
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// Discoverer does not know if an actual change happened.
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// It does guarantee that it sends the new TargetGroup whenever a change happens.
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//
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// Discoverers should initially send a full set of all discoverable TargetGroups.
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type Discoverer interface {
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// Run hands a channel to the discovery provider(consul,dns etc) through which it can send
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// updated target groups.
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// Must returns if the context gets canceled. It should not close the update
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// channel on returning.
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Run(ctx context.Context, up chan<- []*targetgroup.Group)
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}
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type poolKey struct {
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setName string
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provider string
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}
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// provider holds a Discoverer instance, its configuration and its subscribers.
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type provider struct {
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name string
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d Discoverer
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subs []string
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config interface{}
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}
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// NewManager is the Discovery Manager constructor
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func NewManager(ctx context.Context, logger log.Logger) *Manager {
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if logger == nil {
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logger = log.NewNopLogger()
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}
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return &Manager{
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logger: logger,
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syncCh: make(chan map[string][]*targetgroup.Group),
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targets: make(map[poolKey]map[string]*targetgroup.Group),
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discoverCancel: []context.CancelFunc{},
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ctx: ctx,
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updatert: 5 * time.Second,
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}
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}
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// Manager maintains a set of discovery providers and sends each update to a map channel.
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// Targets are grouped by the target set name.
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type Manager struct {
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logger log.Logger
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mtx sync.RWMutex
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ctx context.Context
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discoverCancel []context.CancelFunc
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// Some Discoverers(eg. k8s) send only the updates for a given target group
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// so we use map[tg.Source]*targetgroup.Group to know which group to update.
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targets map[poolKey]map[string]*targetgroup.Group
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// providers keeps track of SD providers.
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providers []*provider
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// The sync channels sends the updates in map[targetSetName] where targetSetName is the job value from the scrape config.
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syncCh chan map[string][]*targetgroup.Group
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// How long to wait before sending updates to the channel. The variable
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// should only be modified in unit tests.
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updatert time.Duration
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}
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// Run starts the background processing
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func (m *Manager) Run() error {
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for range m.ctx.Done() {
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m.cancelDiscoverers()
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return m.ctx.Err()
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}
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return nil
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}
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// SyncCh returns a read only channel used by all Discoverers to send target updates.
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func (m *Manager) SyncCh() <-chan map[string][]*targetgroup.Group {
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return m.syncCh
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}
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// ApplyConfig removes all running discovery providers and starts new ones using the provided config.
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func (m *Manager) ApplyConfig(cfg map[string]sd_config.ServiceDiscoveryConfig) error {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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m.cancelDiscoverers()
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for name, scfg := range cfg {
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m.registerProviders(scfg, name)
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}
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for _, prov := range m.providers {
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m.startProvider(m.ctx, prov)
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}
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return nil
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}
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// StartCustomProvider is used for sdtool. Only use this if you know what you're doing.
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func (m *Manager) StartCustomProvider(ctx context.Context, name string, worker Discoverer) {
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p := &provider{
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name: name,
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d: worker,
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subs: []string{name},
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}
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m.providers = append(m.providers, p)
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m.startProvider(ctx, p)
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}
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func (m *Manager) startProvider(ctx context.Context, p *provider) {
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level.Debug(m.logger).Log("msg", "Starting provider", "provider", p.name, "subs", fmt.Sprintf("%v", p.subs))
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ctx, cancel := context.WithCancel(ctx)
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updates := make(chan []*targetgroup.Group)
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m.discoverCancel = append(m.discoverCancel, cancel)
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go p.d.Run(ctx, updates)
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go m.updater(ctx, p, updates)
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}
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func (m *Manager) updater(ctx context.Context, p *provider, updates chan []*targetgroup.Group) {
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ticker := time.NewTicker(m.updatert)
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defer ticker.Stop()
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triggerUpdate := make(chan struct{}, 1)
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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 tgs, ok := <-updates:
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if !ok {
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level.Debug(m.logger).Log("msg", "discoverer channel closed, sending the last update", "provider", p.name)
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select {
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case m.syncCh <- m.allGroups(): // Waiting until the receiver can accept the last update.
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level.Debug(m.logger).Log("msg", "discoverer exited", "provider", p.name)
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case <-ctx.Done():
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}
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return
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}
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for _, s := range p.subs {
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m.updateGroup(poolKey{setName: s, provider: p.name}, tgs)
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}
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select {
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case triggerUpdate <- struct{}{}:
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default:
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}
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case <-ticker.C: // Some discoverers send updates too often so we throttle these with the ticker.
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select {
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case <-triggerUpdate:
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select {
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case m.syncCh <- m.allGroups():
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default:
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level.Debug(m.logger).Log("msg", "discovery receiver's channel was full so will retry the next cycle", "provider", p.name)
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select {
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case triggerUpdate <- struct{}{}:
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default:
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}
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}
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default:
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}
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}
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}
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}
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func (m *Manager) cancelDiscoverers() {
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for _, c := range m.discoverCancel {
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c()
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}
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m.targets = make(map[poolKey]map[string]*targetgroup.Group)
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m.providers = nil
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m.discoverCancel = nil
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}
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func (m *Manager) updateGroup(poolKey poolKey, tgs []*targetgroup.Group) {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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for _, tg := range tgs {
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if tg != nil { // Some Discoverers send nil target group so need to check for it to avoid panics.
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if _, ok := m.targets[poolKey]; !ok {
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m.targets[poolKey] = make(map[string]*targetgroup.Group)
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}
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m.targets[poolKey][tg.Source] = tg
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}
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}
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}
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func (m *Manager) allGroups() map[string][]*targetgroup.Group {
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m.mtx.Lock()
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defer m.mtx.Unlock()
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tSets := map[string][]*targetgroup.Group{}
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for pkey, tsets := range m.targets {
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for _, tg := range tsets {
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// Even if the target group 'tg' is empty we still need to send it to the 'Scrape manager'
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// to signal that it needs to stop all scrape loops for this target set.
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tSets[pkey.setName] = append(tSets[pkey.setName], tg)
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}
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}
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return tSets
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}
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func (m *Manager) registerProviders(cfg sd_config.ServiceDiscoveryConfig, setName string) {
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add := func(cfg interface{}, newDiscoverer func() (Discoverer, error)) {
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t := reflect.TypeOf(cfg).String()
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for _, p := range m.providers {
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if reflect.DeepEqual(cfg, p.config) {
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p.subs = append(p.subs, setName)
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return
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}
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}
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d, err := newDiscoverer()
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if err != nil {
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level.Error(m.logger).Log("msg", "Cannot create service discovery", "err", err, "type", t)
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failedConfigs.Inc()
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return
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}
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provider := provider{
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name: fmt.Sprintf("%s/%d", t, len(m.providers)),
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d: d,
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config: cfg,
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subs: []string{setName},
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}
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m.providers = append(m.providers, &provider)
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}
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for _, c := range cfg.DNSSDConfigs {
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add(c, func() (Discoverer, error) {
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return dns.NewDiscovery(*c, log.With(m.logger, "discovery", "dns")), nil
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})
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}
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for _, c := range cfg.FileSDConfigs {
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add(c, func() (Discoverer, error) {
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return file.NewDiscovery(c, log.With(m.logger, "discovery", "file")), nil
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})
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}
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for _, c := range cfg.ConsulSDConfigs {
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add(c, func() (Discoverer, error) {
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return consul.NewDiscovery(c, log.With(m.logger, "discovery", "consul"))
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})
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}
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for _, c := range cfg.MarathonSDConfigs {
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add(c, func() (Discoverer, error) {
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return marathon.NewDiscovery(*c, log.With(m.logger, "discovery", "marathon"))
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})
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}
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for _, c := range cfg.KubernetesSDConfigs {
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add(c, func() (Discoverer, error) {
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return kubernetes.New(log.With(m.logger, "discovery", "k8s"), c)
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})
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}
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for _, c := range cfg.ServersetSDConfigs {
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add(c, func() (Discoverer, error) {
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return zookeeper.NewServersetDiscovery(c, log.With(m.logger, "discovery", "zookeeper")), nil
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})
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}
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for _, c := range cfg.NerveSDConfigs {
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add(c, func() (Discoverer, error) {
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return zookeeper.NewNerveDiscovery(c, log.With(m.logger, "discovery", "nerve")), nil
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})
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}
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for _, c := range cfg.EC2SDConfigs {
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add(c, func() (Discoverer, error) {
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return ec2.NewDiscovery(c, log.With(m.logger, "discovery", "ec2")), nil
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})
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}
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for _, c := range cfg.OpenstackSDConfigs {
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add(c, func() (Discoverer, error) {
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return openstack.NewDiscovery(c, log.With(m.logger, "discovery", "openstack"))
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})
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}
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for _, c := range cfg.GCESDConfigs {
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add(c, func() (Discoverer, error) {
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return gce.NewDiscovery(*c, log.With(m.logger, "discovery", "gce"))
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})
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}
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for _, c := range cfg.AzureSDConfigs {
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add(c, func() (Discoverer, error) {
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return azure.NewDiscovery(c, log.With(m.logger, "discovery", "azure")), nil
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})
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}
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for _, c := range cfg.TritonSDConfigs {
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add(c, func() (Discoverer, error) {
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return triton.New(log.With(m.logger, "discovery", "triton"), c)
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})
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}
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if len(cfg.StaticConfigs) > 0 {
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add(setName, func() (Discoverer, error) {
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return &StaticProvider{cfg.StaticConfigs}, nil
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})
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}
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}
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// StaticProvider holds a list of target groups that never change.
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type StaticProvider struct {
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TargetGroups []*targetgroup.Group
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}
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// Run implements the Worker interface.
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func (sd *StaticProvider) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
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// We still have to consider that the consumer exits right away in which case
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// the context will be canceled.
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select {
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case ch <- sd.TargetGroups:
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case <-ctx.Done():
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}
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close(ch)
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}
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