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config_watcher.go
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/
config_watcher.go
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package notifier
import (
"fmt"
"sync"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/consul"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dns"
)
// configWatcher supports dynamic reload of Notifier objects
// from static configuration and service discovery.
// Use newWatcher to create a new object.
type configWatcher struct {
cfg *Config
genFn AlertURLGenerator
wg sync.WaitGroup
reloadCh chan struct{}
syncCh chan struct{}
targetsMu sync.RWMutex
targets map[TargetType][]Target
}
func newWatcher(path string, gen AlertURLGenerator) (*configWatcher, error) {
cfg, err := parseConfig(path)
if err != nil {
return nil, err
}
cw := &configWatcher{
cfg: cfg,
wg: sync.WaitGroup{},
reloadCh: make(chan struct{}, 1),
syncCh: make(chan struct{}),
genFn: gen,
targetsMu: sync.RWMutex{},
targets: make(map[TargetType][]Target),
}
return cw, cw.start()
}
func (cw *configWatcher) notifiers() []Notifier {
cw.targetsMu.RLock()
defer cw.targetsMu.RUnlock()
var notifiers []Notifier
for _, ns := range cw.targets {
for _, n := range ns {
notifiers = append(notifiers, n.Notifier)
}
}
return notifiers
}
func (cw *configWatcher) reload(path string) error {
select {
case cw.reloadCh <- struct{}{}:
default:
return nil
}
defer func() { <-cw.reloadCh }()
cfg, err := parseConfig(path)
if err != nil {
return err
}
if cfg.Checksum == cw.cfg.Checksum {
return nil
}
// stop existing discovery
cw.mustStop()
// re-start cw with new config
cw.syncCh = make(chan struct{})
cw.cfg = cfg
return cw.start()
}
func (cw *configWatcher) add(typeK TargetType, interval time.Duration, labelsFn getLabels) error {
targets, errors := targetsFromLabels(labelsFn, cw.cfg, cw.genFn)
for _, err := range errors {
return fmt.Errorf("failed to init notifier for %q: %s", typeK, err)
}
cw.setTargets(typeK, targets)
cw.wg.Add(1)
go func() {
defer cw.wg.Done()
ticker := time.NewTicker(interval)
defer ticker.Stop()
for {
select {
case <-cw.syncCh:
return
case <-ticker.C:
}
updateTargets, errors := targetsFromLabels(labelsFn, cw.cfg, cw.genFn)
for _, err := range errors {
logger.Errorf("failed to init notifier for %q: %s", typeK, err)
}
cw.setTargets(typeK, updateTargets)
}
}()
return nil
}
func targetsFromLabels(labelsFn getLabels, cfg *Config, genFn AlertURLGenerator) ([]Target, []error) {
metaLabels, err := labelsFn()
if err != nil {
return nil, []error{fmt.Errorf("failed to get labels: %s", err)}
}
var targets []Target
var errors []error
duplicates := make(map[string]struct{})
for _, labels := range metaLabels {
target := labels["__address__"]
u, processedLabels, err := parseLabels(target, labels, cfg)
if err != nil {
errors = append(errors, err)
continue
}
if len(u) == 0 {
continue
}
if _, ok := duplicates[u]; ok { // check for duplicates
if !*suppressDuplicateTargetErrors {
logger.Errorf("skipping duplicate target with identical address %q; "+
"make sure service discovery and relabeling is set up properly; "+
"original labels: %s; resulting labels: %s",
u, labels, processedLabels)
}
continue
}
duplicates[u] = struct{}{}
am, err := NewAlertManager(u, genFn, cfg.HTTPClientConfig, cfg.parsedAlertRelabelConfigs, cfg.Timeout.Duration())
if err != nil {
errors = append(errors, err)
continue
}
targets = append(targets, Target{
Notifier: am,
Labels: processedLabels,
})
}
return targets, errors
}
type getLabels func() ([]map[string]string, error)
func (cw *configWatcher) start() error {
if len(cw.cfg.StaticConfigs) > 0 {
var targets []Target
for _, cfg := range cw.cfg.StaticConfigs {
for _, target := range cfg.Targets {
address, labels, err := parseLabels(target, nil, cw.cfg)
if err != nil {
return fmt.Errorf("failed to parse labels for target %q: %s", target, err)
}
notifier, err := NewAlertManager(address, cw.genFn, cw.cfg.HTTPClientConfig, cw.cfg.parsedAlertRelabelConfigs, cw.cfg.Timeout.Duration())
if err != nil {
return fmt.Errorf("failed to init alertmanager for addr %q: %s", address, err)
}
targets = append(targets, Target{
Notifier: notifier,
Labels: labels,
})
}
}
cw.setTargets(TargetStatic, targets)
}
if len(cw.cfg.ConsulSDConfigs) > 0 {
err := cw.add(TargetConsul, *consul.SDCheckInterval, func() ([]map[string]string, error) {
var labels []map[string]string
for i := range cw.cfg.ConsulSDConfigs {
sdc := &cw.cfg.ConsulSDConfigs[i]
targetLabels, err := sdc.GetLabels(cw.cfg.baseDir)
if err != nil {
return nil, fmt.Errorf("got labels err: %s", err)
}
labels = append(labels, targetLabels...)
}
return labels, nil
})
if err != nil {
return fmt.Errorf("failed to start consulSD discovery: %s", err)
}
}
if len(cw.cfg.DNSSDConfigs) > 0 {
err := cw.add(TargetDNS, *dns.SDCheckInterval, func() ([]map[string]string, error) {
var labels []map[string]string
for i := range cw.cfg.DNSSDConfigs {
sdc := &cw.cfg.DNSSDConfigs[i]
targetLabels, err := sdc.GetLabels(cw.cfg.baseDir)
if err != nil {
return nil, fmt.Errorf("got labels err: %s", err)
}
labels = append(labels, targetLabels...)
}
return labels, nil
})
if err != nil {
return fmt.Errorf("failed to start DNSSD discovery: %s", err)
}
}
return nil
}
func (cw *configWatcher) mustStop() {
close(cw.syncCh)
cw.wg.Wait()
cw.targetsMu.Lock()
for _, targets := range cw.targets {
for _, t := range targets {
t.Close()
}
}
cw.targets = make(map[TargetType][]Target)
cw.targetsMu.Unlock()
for i := range cw.cfg.ConsulSDConfigs {
cw.cfg.ConsulSDConfigs[i].MustStop()
}
cw.cfg = nil
}
func (cw *configWatcher) setTargets(key TargetType, targets []Target) {
cw.targetsMu.Lock()
newT := make(map[string]Target)
for _, t := range targets {
newT[t.Addr()] = t
}
oldT := cw.targets[key]
for _, ot := range oldT {
if _, ok := newT[ot.Addr()]; !ok {
ot.Notifier.Close()
}
}
cw.targets[key] = targets
cw.targetsMu.Unlock()
}