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notifier.go
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notifier.go
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package ruler
import (
"context"
"crypto/md5"
"encoding/json"
"fmt"
"strings"
"sync"
gklog "github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
config_util "github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/discovery"
sd_config "github.com/prometheus/prometheus/discovery/config"
"github.com/prometheus/prometheus/discovery/dns"
"github.com/prometheus/prometheus/discovery/targetgroup"
"github.com/prometheus/prometheus/notifier"
)
// rulerNotifier bundles a notifier.Manager together with an associated
// Alertmanager service discovery manager and handles the lifecycle
// of both actors.
type rulerNotifier struct {
notifier *notifier.Manager
sdCancel context.CancelFunc
sdManager *discovery.Manager
wg sync.WaitGroup
logger gklog.Logger
}
func newRulerNotifier(o *notifier.Options, l gklog.Logger) *rulerNotifier {
sdCtx, sdCancel := context.WithCancel(context.Background())
return &rulerNotifier{
notifier: notifier.NewManager(o, l),
sdCancel: sdCancel,
sdManager: discovery.NewManager(sdCtx, l),
logger: l,
}
}
func (rn *rulerNotifier) run() {
rn.wg.Add(2)
go func() {
if err := rn.sdManager.Run(); err != nil {
level.Error(rn.logger).Log("msg", "error starting notifier discovery manager", "err", err)
}
rn.wg.Done()
}()
go func() {
rn.notifier.Run(rn.sdManager.SyncCh())
rn.wg.Done()
}()
}
func (rn *rulerNotifier) applyConfig(cfg *config.Config) error {
if err := rn.notifier.ApplyConfig(cfg); err != nil {
return err
}
sdCfgs := make(map[string]sd_config.ServiceDiscoveryConfig)
for _, v := range cfg.AlertingConfig.AlertmanagerConfigs {
// AlertmanagerConfigs doesn't hold an unique identifier so we use the config hash as the identifier.
b, err := json.Marshal(v)
if err != nil {
return err
}
// This hash needs to be identical to the one computed in the notifier in
// https://github.com/prometheus/prometheus/blob/719c579f7b917b384c3d629752dea026513317dc/notifier/notifier.go#L265
// This kind of sucks, but it's done in Prometheus in main.go in the same way.
sdCfgs[fmt.Sprintf("%x", md5.Sum(b))] = v.ServiceDiscoveryConfig
}
return rn.sdManager.ApplyConfig(sdCfgs)
}
func (rn *rulerNotifier) stop() {
rn.sdCancel()
rn.notifier.Stop()
rn.wg.Wait()
}
// Builds a Prometheus config.Config from a ruler.Config with just the required
// options to configure notifications to Alertmanager.
func buildNotifierConfig(rulerConfig *Config) (*config.Config, error) {
if rulerConfig.AlertmanagerURL.URL == nil {
return &config.Config{}, nil
}
u := rulerConfig.AlertmanagerURL
var sdConfig sd_config.ServiceDiscoveryConfig
if rulerConfig.AlertmanagerDiscovery {
if !strings.Contains(u.Host, "_tcp.") {
return nil, fmt.Errorf("When alertmanager-discovery is on, host name must be of the form _portname._tcp.service.fqdn (is %q)", u.Host)
}
dnsSDConfig := dns.SDConfig{
Names: []string{u.Host},
RefreshInterval: model.Duration(rulerConfig.AlertmanagerRefreshInterval),
Type: "SRV",
Port: 0, // Ignored, because of SRV.
}
sdConfig = sd_config.ServiceDiscoveryConfig{
DNSSDConfigs: []*dns.SDConfig{&dnsSDConfig},
}
} else {
sdConfig = sd_config.ServiceDiscoveryConfig{
StaticConfigs: []*targetgroup.Group{
{
Targets: []model.LabelSet{
{
model.AddressLabel: model.LabelValue(u.Host),
},
},
},
},
}
}
amConfig := &config.AlertmanagerConfig{
APIVersion: config.AlertmanagerAPIVersionV1,
Scheme: u.Scheme,
PathPrefix: u.Path,
Timeout: model.Duration(rulerConfig.NotificationTimeout),
ServiceDiscoveryConfig: sdConfig,
}
if rulerConfig.AlertmanangerEnableV2API {
amConfig.APIVersion = config.AlertmanagerAPIVersionV2
}
promConfig := &config.Config{
AlertingConfig: config.AlertingConfig{
AlertmanagerConfigs: []*config.AlertmanagerConfig{amConfig},
},
}
if u.User != nil {
amConfig.HTTPClientConfig = config_util.HTTPClientConfig{
BasicAuth: &config_util.BasicAuth{
Username: u.User.Username(),
},
}
if password, isSet := u.User.Password(); isSet {
amConfig.HTTPClientConfig.BasicAuth.Password = config_util.Secret(password)
}
}
return promConfig, nil
}