api/api.go

package api

import (
	"context"
	"net/http"
	"os"
	"os/signal"
	"sync"
	"syscall"
	"time"

	"github.com/Sirupsen/logrus"
)

type Api struct {
	httpServer *http.Server
	mux        *http.ServeMux
	online     bool
	running    chan os.Signal
}

func NewApi(serverAddress string) *Api {
	srv := &http.Server{
		Addr:         serverAddress,
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
		IdleTimeout:  120 * time.Second,
	}

	webserver := &Api{
		httpServer: srv,
		mux:        http.NewServeMux(),
		online:     false,
	}

	return webserver
}

func (api *Api) AddHandler(path string, handler func(http.ResponseWriter, *http.Request)) {
	api.mux.HandleFunc(path, handler)
}

func (api *Api) Start(wg *sync.WaitGroup) error {
	defer wg.Done()

	api.httpServer.Handler = api.mux

	go func() {
		api.httpServer.ListenAndServe()
	}()

	go logrus.Info("API webserver has started")
	api.online = true
	api.running = make(chan os.Signal, 1)
	signal.Notify(api.running, syscall.SIGINT, syscall.SIGTERM, os.Interrupt, os.Kill)
	<-api.running

	ctx, _ := context.WithTimeout(context.Background(), 5*time.Second)

	if err := api.httpServer.Shutdown(ctx); err != nil {
		logrus.Error(err)
	} else {
		logrus.Info("API webserver shutdown")
	}
	api.online = false
	return nil
}

func (api *Api) Stop() {
	if api.online {
		logrus.Infof("Shutting down API webserver")
		api.running <- syscall.SIGINT
	}
}