mirror of
https://github.com/TwiN/gatus.git
synced 2024-12-14 11:58:04 +00:00
112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
package main
|
|
|
|
import (
|
|
"log"
|
|
"os"
|
|
"os/signal"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/TwiN/gatus/v5/config"
|
|
"github.com/TwiN/gatus/v5/controller"
|
|
"github.com/TwiN/gatus/v5/storage/store"
|
|
"github.com/TwiN/gatus/v5/watchdog"
|
|
)
|
|
|
|
func main() {
|
|
cfg, err := loadConfiguration()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
initializeStorage(cfg)
|
|
start(cfg)
|
|
// Wait for termination signal
|
|
signalChannel := make(chan os.Signal, 1)
|
|
done := make(chan bool, 1)
|
|
signal.Notify(signalChannel, os.Interrupt, syscall.SIGTERM)
|
|
go func() {
|
|
<-signalChannel
|
|
log.Println("Received termination signal, attempting to gracefully shut down")
|
|
stop()
|
|
save()
|
|
done <- true
|
|
}()
|
|
<-done
|
|
log.Println("Shutting down")
|
|
}
|
|
|
|
func start(cfg *config.Config) {
|
|
go controller.Handle(cfg)
|
|
watchdog.Monitor(cfg)
|
|
go listenToConfigurationFileChanges(cfg)
|
|
}
|
|
|
|
func stop() {
|
|
watchdog.Shutdown()
|
|
controller.Shutdown()
|
|
}
|
|
|
|
func save() {
|
|
if err := store.Get().Save(); err != nil {
|
|
log.Println("Failed to save storage provider:", err.Error())
|
|
}
|
|
}
|
|
|
|
func loadConfiguration() (*config.Config, error) {
|
|
configPath := os.Getenv("GATUS_CONFIG_PATH")
|
|
// Backwards compatibility
|
|
if len(configPath) == 0 {
|
|
if configPath = os.Getenv("GATUS_CONFIG_FILE"); len(configPath) > 0 {
|
|
log.Println("WARNING: GATUS_CONFIG_FILE is deprecated. Please use GATUS_CONFIG_PATH instead.")
|
|
}
|
|
}
|
|
return config.LoadConfiguration(configPath)
|
|
}
|
|
|
|
// initializeStorage initializes the storage provider
|
|
//
|
|
// Q: "TwiN, why are you putting this here? Wouldn't it make more sense to have this in the config?!"
|
|
// A: Yes. Yes it would make more sense to have it in the config package. But I don't want to import
|
|
// the massive SQL dependencies just because I want to import the config, so here we are.
|
|
func initializeStorage(cfg *config.Config) {
|
|
err := store.Initialize(cfg.Storage)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
// Remove all EndpointStatus that represent endpoints which no longer exist in the configuration
|
|
var keys []string
|
|
for _, endpoint := range cfg.Endpoints {
|
|
keys = append(keys, endpoint.Key())
|
|
}
|
|
numberOfEndpointStatusesDeleted := store.Get().DeleteAllEndpointStatusesNotInKeys(keys)
|
|
if numberOfEndpointStatusesDeleted > 0 {
|
|
log.Printf("[main][initializeStorage] Deleted %d endpoint statuses because their matching endpoints no longer existed", numberOfEndpointStatusesDeleted)
|
|
}
|
|
}
|
|
|
|
func listenToConfigurationFileChanges(cfg *config.Config) {
|
|
for {
|
|
time.Sleep(30 * time.Second)
|
|
if cfg.HasLoadedConfigurationBeenModified() {
|
|
log.Println("[main][listenToConfigurationFileChanges] Configuration file has been modified")
|
|
stop()
|
|
time.Sleep(time.Second) // Wait a bit to make sure everything is done.
|
|
save()
|
|
updatedConfig, err := loadConfiguration()
|
|
if err != nil {
|
|
if cfg.SkipInvalidConfigUpdate {
|
|
log.Println("[main][listenToConfigurationFileChanges] Failed to load new configuration:", err.Error())
|
|
log.Println("[main][listenToConfigurationFileChanges] The configuration file was updated, but it is not valid. The old configuration will continue being used.")
|
|
// Update the last file modification time to avoid trying to process the same invalid configuration again
|
|
cfg.UpdateLastFileModTime()
|
|
continue
|
|
} else {
|
|
panic(err)
|
|
}
|
|
}
|
|
initializeStorage(updatedConfig)
|
|
start(updatedConfig)
|
|
return
|
|
}
|
|
}
|
|
}
|