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plugin.go
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/
plugin.go
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package gracefulshutdown
import (
"os"
"os/signal"
"runtime/pprof"
"sort"
"strings"
"sync"
"syscall"
"time"
"github.com/iotaledger/hive.go/daemon"
"github.com/iotaledger/hive.go/logger"
"github.com/iotaledger/hive.go/node"
"github.com/iotaledger/goshimmer/plugins/config"
)
// PluginName is the name of the graceful shutdown plugin.
const PluginName = "Graceful Shutdown"
var (
// plugin is the plugin instance of the graceful shutdown plugin.
plugin *node.Plugin
once sync.Once
log *logger.Logger
gracefulStop chan os.Signal
waitToKillTimeInSeconds int
)
func configure(*node.Plugin) {
waitToKillTimeInSeconds = config.Node().Int(CfgWaitToKillTimeInSeconds)
log = logger.NewLogger(PluginName)
gracefulStop = make(chan os.Signal)
signal.Notify(gracefulStop, syscall.SIGTERM)
signal.Notify(gracefulStop, syscall.SIGINT)
go func() {
<-gracefulStop
log.Warnf("Received shutdown request - waiting (max %d) to finish processing ...", waitToKillTimeInSeconds)
go func() {
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
start := time.Now()
for x := range ticker.C {
secondsSinceStart := x.Sub(start).Seconds()
if secondsSinceStart <= float64(waitToKillTimeInSeconds) {
processList := ""
runningBackgroundWorkers := daemon.GetRunningBackgroundWorkers()
if len(runningBackgroundWorkers) >= 1 {
sort.Strings(runningBackgroundWorkers)
processList = "(" + strings.Join(runningBackgroundWorkers, ", ") + ") "
}
log.Warnf("Received shutdown request - waiting (max %d seconds) to finish processing %s...", waitToKillTimeInSeconds-int(secondsSinceStart), processList)
} else {
log.Error("Background processes did not terminate in time! Forcing shutdown ...")
pprof.Lookup("goroutine").WriteTo(os.Stdout, 2)
os.Exit(1)
}
}
}()
daemon.Shutdown()
}()
}
// Plugin gets the plugin instance.
func Plugin() *node.Plugin {
once.Do(func() {
plugin = node.NewPlugin(PluginName, node.Enabled, configure)
})
return plugin
}
// ShutdownWithError prints out an error message and shuts down the default daemon instance.
func ShutdownWithError(err error) {
log.Error(err)
gracefulStop <- syscall.SIGINT
}