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webserver.go
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/
webserver.go
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package service
import (
"os"
"syscall"
"net/http"
"os/signal"
"context"
log "github.com/OlegGorJ/service-common-lib/common/logging"
"github.com/OlegGorJ/service-common-lib/common/util"
)
// StartWebServer starts a webserver on the specified port.
//@params
//
//@return
//
func StartServer(port string) {
log.Info("Service RELEASE: ", util.GetENV("RELEASE"), " and Port:" , port)
if port == "" { log.Error("Can't start the server, port number unspecified.") ; return }
r := Router(port)
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt, syscall.SIGTERM)
srv := &http.Server{
Addr: ":" + port,
Handler: r,
}
// this channel is for graceful shutdown..
// if we receive an error, we can send it here to notify the server to be stopped
shutdown := make(chan struct{}, 1)
go func() {
err := srv.ListenAndServe()
if err != nil {
shutdown <- struct{}{}
log.Error("%v", err)
}
}()
log.Debug("The service is ready to listen and serve.")
select {
case killSignal := <-interrupt:
switch killSignal {
case os.Interrupt:
log.Debug("Got SIGINT...")
case syscall.SIGTERM:
log.Debug("Got SIGTERM...")
}
case <-shutdown:
log.Error("Got an error - shutdown...")
}
log.Info("The service is shutting down...")
srv.Shutdown(context.Background())
}