kgpz_web/kgpz_web.go

package main

import (
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/Theodor-Springmann-Stiftung/kgpz_web/app"
	"github.com/Theodor-Springmann-Stiftung/kgpz_web/helpers"
	"github.com/Theodor-Springmann-Stiftung/kgpz_web/helpers/logging"
	"github.com/Theodor-Springmann-Stiftung/kgpz_web/providers"
	"github.com/Theodor-Springmann-Stiftung/kgpz_web/server"
	"github.com/Theodor-Springmann-Stiftung/kgpz_web/templating"
	"github.com/Theodor-Springmann-Stiftung/kgpz_web/views"
	"github.com/gofiber/fiber/v2"
)

const (
	DEFAULT_CONFIG = "config.json"
	DEV_CONFIG     = "config.dev.json"
)

// 1. Check if folder exists
//		- If not, clone the repo, if possible or throw if error
// 2. If the folder exists, we try to serialize -- and spawn a goroutine to pull.
//		Upon pulling, we read in the current state of the repository, even if it's up to date.
//		-> If the repo was changed we execute a callback and parse again.
//		-> If pulling fails, we retry after a certain amount of time.
//		   Still we can continue if serialization proceeds.
//		-> If serialization fails, we throw an error, log it. We try to pull in the background.
//		- setup commit date & hash
//		- Setup GitHub webhook if set

func main() {
	cfg := providers.NewConfigProvider([]string{DEV_CONFIG, DEFAULT_CONFIG})
	if err := cfg.Read(); err != nil {
		helpers.Assert(err, "Error reading config")
	}

	if cfg.Config.Debug {
		logging.SetDebug()
	} else {
		logging.SetInfo()
	}

	kgpz := app.NewKGPZ(cfg)
	kgpz.Init()

	server := server.Create(kgpz, cfg, Engine(kgpz, cfg))
	Start(kgpz, server, cfg)
}

func Start(k *app.KGPZ, s *server.Server, c *providers.ConfigProvider) {
	s.Start()

	sigs := make(chan os.Signal, 1)
	done := make(chan bool, 1)

	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)

	go func() {
		sig := <-sigs
		logging.Info("Signal received, Cleaning up...")
		// INFO: here we add cleanup functions
		if sig == syscall.SIGTERM {
			s.Stop()
			logging.Info("Server stopped. Waiting for FS.")
		} else {
			s.Kill()
			logging.Info("Server killed. Waiting for FS.")
		}
		k.Shutdown()
		logging.Info("Shutdown complete.")
		done <- true
	}()

	// INFO: hot reloading for poor people
	if c.Watch {
		go func() {
			_, routesexist := os.Stat(server.ROUTES_FILEPATH)
			_, layoutexist := os.Stat(server.LAYOUT_FILEPATH)

			if routesexist != nil && layoutexist != nil {
				logging.Info("Routes or Layout folder does not exist. Watcher disabled.")
				return
			}

			watcher, err := helpers.NewFileWatcher()
			if err != nil {
				return
			}

			watcher.Append(func(path string) {
				logging.Info("File changed: ", path)
				time.Sleep(200 * time.Millisecond)
				s.Engine(Engine(k, c))
			})

			if routesexist != nil {
				err = watcher.RecursiveDir(server.ROUTES_FILEPATH)
				if err != nil {
					return
				}
			}

			if layoutexist != nil {
				err = watcher.RecursiveDir(server.LAYOUT_FILEPATH)
				if err != nil {
					return
				}
			}
		}()

	}

	// Interactive listening for input
	// if k.IsDebug() {
	// 	go func() {
	// 		for {
	// 			var input string
	// 			fmt.Scanln(&input)
	// 			if input == "r" {
	// 				s.Restart()
	// 			} else if input == "p" {
	// 				k.Pull()
	// 			} else if input == "q" {
	// 				sigs <- os.Signal(syscall.SIGTERM)
	// 			}
	// 		}
	// 	}()
	// }
	//
	<-done
}

func Engine(kgpz *app.KGPZ, c *providers.ConfigProvider) *templating.Engine {
	e := templating.NewEngine(&views.LayoutFS, &views.RoutesFS)
	e.Funcs(kgpz)
	e.Globals(fiber.Map{"isDev": c.Config.Debug, "name": "KGPZ", "lang": "de"})
	return e
}