qv/cmd/web/main.go

//go:generate oapi-codegen --config=oapi-codegen.yml openapi.yml

package main

import (
	"code.dlmw.ch/dlmw/qv/internal/migrations"
	"code.dlmw.ch/dlmw/qv/internal/models"
	"context"
	"database/sql"
	_ "github.com/mattn/go-sqlite3"
	"log/slog"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
)

type application struct {
	logger    *slog.Logger
	elections models.ElectionModelInterface
	voters    models.VoterModelInterface
}

var addr = ":8080"

func main() {
	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))

	db, err := openDb()
	if err != nil {
		logger.Error(err.Error())
		os.Exit(1)
	}
	defer db.Close()
	err = migrations.Run(db)
	if err != nil {
		logger.Error(err.Error())
		os.Exit(1)
	}

	app := &application{
		logger:    logger,
		elections: &models.ElectionModel{DB: db},
		voters:    &models.VoterModel{DB: db},
	}

	logger.Info("Starting server", "addr", addr)

	srv := &http.Server{
		Addr:         addr,
		Handler:      app.routes(),
		ErrorLog:     slog.NewLogLogger(logger.Handler(), slog.LevelError),
		IdleTimeout:  time.Minute,
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
	}

	go watchForQuitSignals(srv, logger)

	if err = srv.ListenAndServe(); err != nil {
		logger.Error(err.Error())
		os.Exit(1)
	}
}

func openDb() (*sql.DB, error) {
	db, err := sql.Open("sqlite3", "./qv.sqlite")
	if err == nil {
		err = db.Ping()
	}
	return db, err
}

func watchForQuitSignals(srv *http.Server, logger *slog.Logger) {
	quit := make(chan os.Signal, 1)

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

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	s := <-quit
	logger.Info("caught signal", "signal", s.String())
	srv.Shutdown(ctx)
	os.Exit(0)
}