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serve.go
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serve.go
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/*
* Authors:
* Simon Gerber <[email protected]>
*
* License:
* Copyright (c) 2019, VSHN AG, <[email protected]>
* Licensed under "BSD 3-Clause". See LICENSE file.
*/
package main
import (
"fmt"
"net/http"
"time"
"github.com/bketelsen/logr"
"github.com/vshn/go-icinga2-client/icinga2"
"github.com/vshn/signalilo/config"
"github.com/vshn/signalilo/gc"
"github.com/vshn/signalilo/webhook"
"gopkg.in/alecthomas/kingpin.v2"
)
// ServeCommand holds all the configuration and objects necessary to serve the
// Signalilo webhook
type ServeCommand struct {
port int
logLevel int
config config.SignaliloConfig
logger logr.Logger
icingaClient icinga2.Client
heartbeatTicker *time.Ticker
gcTicker *time.Ticker
}
// GetConfig implements config.Configuration
func (s *ServeCommand) GetConfig() *config.SignaliloConfig {
return &s.config
}
// GetLogger implements config.Configuration
func (s *ServeCommand) GetLogger() logr.Logger {
return s.logger
}
// GetIcingaClient implements config.Configuration
func (s *ServeCommand) GetIcingaClient() icinga2.Client {
return s.icingaClient
}
// SetLogger implements config.Configuration
func (s *ServeCommand) SetLogger(logger logr.Logger) {
s.logger = logger
}
// SetIcingaClient implements config.Configuration
func (s *ServeCommand) SetIcingaClient(client icinga2.Client) {
s.icingaClient = client
}
func healthz(w http.ResponseWriter, r *http.Request, c config.Configuration) {
fmt.Fprint(w, "ok")
c.GetLogger().V(3).Infof("Config: %+v", c.GetConfig())
}
func (s *ServeCommand) heartbeat(ts time.Time) error {
icinga := s.GetIcingaClient()
config := s.GetConfig()
l := s.GetLogger()
_, err := icinga.GetHost(config.HostName)
if err != nil {
l.Errorf("heartbeat: unable to get servicehost: %v", err)
return err
}
svc, err := icinga.GetService(fmt.Sprintf("%v!heartbeat", config.HostName))
if err != nil {
l.Errorf("heartbeat: unable to get heartbeat service: %v", err)
return err
}
msg := fmt.Sprintf("OK: %v", ts.Format(time.RFC3339))
l.Infof("Sending heartbeat: '%v'", msg)
err = icinga.ProcessCheckResult(svc, icinga2.Action{
ExitStatus: 0,
PluginOutput: msg,
})
if err != nil {
l.Errorf("heartbeat: process_check_result: %v", err)
}
return nil
}
func (s *ServeCommand) startHeartbeat() error {
hbInterval := s.GetConfig().HeartbeatInterval
s.heartbeatTicker = time.NewTicker(hbInterval)
s.logger.Infof("Starting heartbeat: interval %v", hbInterval)
go func() {
// Send initial heartbeat from goroutine to make server
// startup quicker
err := s.heartbeat(time.Now())
if err != nil {
s.logger.Errorf("Unable to send initial heartbeat: %v", err)
}
for ts := range s.heartbeatTicker.C {
if err := s.heartbeat(ts); err != nil {
s.logger.Errorf("sending heartbeat: %s", err)
}
}
}()
return nil
}
func (s *ServeCommand) startServiceGC() error {
gcInterval := s.GetConfig().GcInterval
s.gcTicker = time.NewTicker(gcInterval)
s.logger.Infof("Starting service garbage collector: interval %v", gcInterval)
go func() {
for ts := range s.gcTicker.C {
if err := gc.Collect(ts, s); err != nil {
s.logger.Error(err)
}
}
}()
return nil
}
func (s *ServeCommand) run(ctx *kingpin.ParseContext) error {
http.HandleFunc("/healthz",
func(w http.ResponseWriter, r *http.Request) { healthz(w, r, s) })
http.HandleFunc("/webhook",
func(w http.ResponseWriter, r *http.Request) { webhook.Webhook(w, r, s) })
s.logger.Infof("Signalilo UUID: %v", s.GetConfig().UUID)
s.logger.Infof("Keep for: %v", s.GetConfig().KeepFor)
if err := s.startHeartbeat(); err != nil {
return err
}
if err := s.startServiceGC(); err != nil {
return err
}
listenAddress := fmt.Sprintf(":%d", s.port)
s.logger.Infof("listening on: %v", listenAddress)
alertManagerConfig := s.config.AlertManagerConfig
if alertManagerConfig.UseTLS {
s.logger.Infof("Using TLS: certificate=%v, key=%v", alertManagerConfig.TLSCertPath, alertManagerConfig.TLSKeyPath)
return http.ListenAndServeTLS(listenAddress, alertManagerConfig.TLSCertPath, alertManagerConfig.TLSKeyPath, nil)
}
return http.ListenAndServe(listenAddress, nil)
}
func (s *ServeCommand) initialize(ctx *kingpin.ParseContext) error {
s.logger = config.NewLogger(s.logLevel)
config.ConfigInitialize(s)
return nil
}
func configureServeCommand(app *kingpin.Application) {
s := &ServeCommand{logLevel: 1,
config: config.SignaliloConfig{
StaticServiceVars: map[string]string{},
CustomSeverityLevels: map[string]string{},
},
}
serve := app.Command("serve", "Run the Signalilo service").Default().Action(s.run).PreAction(s.initialize)
// General configuration
serve.Flag("uuid", "Instance UUID").Envar("SIGNALILO_UUID").Required().StringVar(&s.config.UUID)
serve.Flag("loglevel", "Signalilo Loglevel").Envar("SIGNALILO_LOG_LEVEL").Default("2").IntVar(&s.config.LogLevel)
// Icinga2 client configuration
serve.Flag("icinga_hostname", "Icinga Servicehost Name").Envar("SIGNALILO_ICINGA_HOSTNAME").Required().StringVar(&s.config.HostName)
serve.Flag("icinga_url", "Icinga API URL").Envar("SIGNALILO_ICINGA_URL").Required().StringVar(&s.config.IcingaConfig.URL)
serve.Flag("icinga_username", "Icinga Username").Envar("SIGNALILO_ICINGA_USERNAME").Required().StringVar(&s.config.IcingaConfig.User)
serve.Flag("icinga_password", "Icinga Password").Envar("SIGNALILO_ICINGA_PASSWORD").Required().StringVar(&s.config.IcingaConfig.Password)
serve.Flag("icinga_insecure_tls", "Skip Icinga TLS verification").Envar("SIGNALILO_ICINGA_INSECURE_TLS").Default("false").BoolVar(&s.config.IcingaConfig.InsecureTLS)
serve.Flag("icinga_x509_verify_cn", "Use CN when verifying certificates. Overrides the default go1.15 behavior of rejecting certificates without matching SAN.").Envar("SIGNALILO_ICINGA_X509_VERIFY_CN").Default("true").BoolVar(&s.config.IcingaConfig.X509VerifyCN)
serve.Flag("icinga_disable_keepalives", "Disable HTTP keepalives").Envar("SIGNALILO_ICINGA_DISABLE_KEEPALIVES").Default("false").BoolVar(&s.config.IcingaConfig.DisableKeepAlives)
serve.Flag("icinga_debug", "Enable debug-level logging for icinga2 client library").Envar("SIGNALILO_ICINGA_DEBUG").Default("false").BoolVar(&s.config.IcingaConfig.Debug)
serve.Flag("icinga_heartbeat_interval", "Heartbeat interval to Icinga").Envar("SIGNALILO_ICINGA_HEARTBEAT_INTERVAL").Default("1m").DurationVar(&s.config.HeartbeatInterval)
serve.Flag("icinga_gc_interval", "Garbage collection interval for old alerts").Envar("SIGNALILO_ICINGA_GC_INTERVAL").Default("15m").DurationVar(&s.config.GcInterval)
serve.Flag("icinga_keep_for", "How long to keep old alerts around after they've been resolved").Envar("SIGNALILO_ICINGA_KEEP_FOR").Default("168h").DurationVar(&s.config.KeepFor)
serve.Flag("icinga_ca", "A custom CA certificate to use when connecting to the Icinga API").Envar("SIGNALILO_ICINGA_CA").StringVar(&s.config.CAData)
serve.Flag("icinga_service_checks_active", "Create icinga services as active checks").Envar("SIGNALILO_ICINGA_SERVICE_CHECKS_ACTIVE").Default("false").BoolVar(&s.config.ActiveChecks)
serve.Flag("icinga_service_checks_command", "Specify icinga check command during service creation").Envar("SIGNALILO_ICINGA_SERVICE_CHECKS_COMMAND").Default("dummy").StringVar(&s.config.CheckCommand)
serve.Flag("icinga_service_checks_interval", "Interval (in seconds) to be used for icinga check_interval and retry_interval").Envar("SIGNALILO_ICINGA_SERVICE_CHECKS_INTERVAL").Default("12h").DurationVar(&s.config.ChecksInterval)
serve.Flag("icinga_service_max_check_attempts", "The maximum number of checks which are executed before changing to a hard state").Envar("SIGNALILO_ICINGA_SERVICE_MAX_CHECK_ATTEMPTS").Default("1").IntVar(&s.config.MaxCheckAttempts)
serve.Flag("icinga_static_service_var", "A variable to be set on each Icinga service created by Signalilo. The expected format is variable=value. Can be repeated.").Envar("SIGNALILO_ICINGA_STATIC_SERVICE_VAR").StringMapVar(&s.config.StaticServiceVars)
// Alert manager configuration
serve.Flag("alertmanager_port", "Listening port for the Alertmanager webhook").Default("8888").Envar("SIGNALILO_ALERTMANAGER_PORT").IntVar(&s.port)
serve.Flag("alertmanager_bearer_token", "Bearer token for incoming requests").Envar("SIGNALILO_ALERTMANAGER_BEARER_TOKEN").Required().StringVar(&s.config.AlertManagerConfig.BearerToken)
serve.Flag("alertmanager_tls_cert", "Path of certificate file for TLS-enabled webhook endpoint. Should contain the full chain").Envar("SIGNALILO_ALERTMANAGER_TLS_CERT").StringVar(&s.config.AlertManagerConfig.TLSCertPath)
serve.Flag("alertmanager_tls_key", "Path of private key file for TLS-enabled webhook endpoint").Envar("SIGNALILO_ALERTMANAGER_TLS_KEY").StringVar(&s.config.AlertManagerConfig.TLSKeyPath)
serve.Flag("alertmanager_pluginoutput_annotations", "List of Annotation names to be used to set the Plugin Output for the Icinga Service").Default("message").Envar("SIGNALILO_ALERTMANAGER_PLUGINOUTPUT_ANNOTATIONS").StringsVar(&s.config.AlertManagerConfig.PluginOutputAnnotations)
serve.Flag("alertmanager_custom_severity_levels", "Add or override the default mapping of Severity Levels to Service States. The expected format is Severity_Level=Service_State where the Service_State is 0=OK, 2=Warning, 3=Critical, 4=Unknown. Can be repeated.").Envar("SIGNALILO_ALERTMANAGER_CUSTOM_SEVERITY_LEVELS").StringMapVar(&s.config.CustomSeverityLevels)
}