guesstimate/cmd/server/main.go

package main

import (
	"context"
	"net/http"

	"forge.cadoles.com/Cadoles/guesstimate/internal/config"
	"forge.cadoles.com/Cadoles/guesstimate/internal/route"

	"github.com/go-chi/chi"
	"github.com/go-chi/chi/middleware"
	"gitlab.com/wpetit/goweb/middleware/container"

	"flag"
	"fmt"
	"log"

	"os"

	"github.com/pkg/errors"
	"gitlab.com/wpetit/goweb/logger"
)

//nolint: gochecknoglobals
var (
	configFile = ""
	workdir    = ""
	dumpConfig = false
	version    = false
	migrate    = ""
)

// nolint: gochecknoglobals
var (
	GitRef         = "unknown"
	ProjectVersion = "unknown"
	BuildDate      = "unknown"
)

//nolint: gochecknoinits
func init() {
	flag.StringVar(&configFile, "config", configFile, "configuration file")
	flag.StringVar(&workdir, "workdir", workdir, "working directory")
	flag.BoolVar(&dumpConfig, "dump-config", dumpConfig, "dump configuration and exit")
	flag.BoolVar(&version, "version", version, "show version and exit")
	flag.StringVar(&migrate, "migrate", migrate, "migrate data schema version and exit, possible values: latest, down, up")
}

func main() {
	ctx := context.Background()

	flag.Parse()

	if version {
		fmt.Printf("%s (%s) - %s\n", ProjectVersion, GitRef, BuildDate)

		os.Exit(0)
	}

	// Switch to new working directory if defined
	if workdir != "" {
		if err := os.Chdir(workdir); err != nil {
			logger.Fatal(
				ctx,
				"could not change working directory",
				logger.E(err),
				logger.F("workdir", workdir),
			)
		}
	}

	// Load configuration file if defined, use default configuration otherwise
	var conf *config.Config

	var err error

	if configFile != "" {
		conf, err = config.NewFromFile(configFile)
		if err != nil {
			log.Fatalf("%+v", errors.Wrapf(err, " '%s'", configFile))
			logger.Fatal(
				ctx,
				"could not load config file",
				logger.E(err),
				logger.F("configFile", configFile),
			)
		}
	} else {
		if dumpConfig {
			conf = config.NewDumpDefault()
		} else {
			conf = config.NewDefault()
		}

	}

	// Dump configuration if asked
	if dumpConfig {
		if err := config.Dump(conf, os.Stdout); err != nil {
			logger.Fatal(
				ctx,
				"could not dump config",
				logger.E(err),
			)
		}

		os.Exit(0)
	}

	if err := config.WithEnvironment(conf); err != nil {
		logger.Fatal(
			ctx,
			"could not override config with environment",
			logger.E(err),
		)
	}

	logger.Info(
		ctx,
		"starting",
		logger.F("gitRef", GitRef),
		logger.F("projectVersion", ProjectVersion),
		logger.F("buildDate", BuildDate),
	)

	logger.Debug(ctx, "setting log format", logger.F("format", conf.Log.Format))
	logger.SetFormat(conf.Log.Format)

	logger.Debug(ctx, "setting log level", logger.F("level", conf.Log.Level.String()))
	logger.SetLevel(conf.Log.Level)

	// Create service container
	ctn, err := getServiceContainer(ctx, conf)
	if err != nil {
		logger.Fatal(
			ctx,
			"could not create service container",
			logger.E(err),
		)
	}

	ctx = container.WithContainer(ctx, ctn)

	if migrate != "" {
		if err := applyMigration(ctx, ctn); err != nil {
			logger.Fatal(
				ctx,
				"could not apply migration",
				logger.E(err),
			)
		}

		os.Exit(0)
	}

	r := chi.NewRouter()

	// Define base middlewares
	r.Use(middleware.Logger)
	r.Use(middleware.Recoverer)

	// Expose service container on router
	r.Use(container.ServiceContainer(ctn))

	// Define routes
	if err := route.Mount(r, conf); err != nil {
		logger.Fatal(
			ctx,
			"could not mount http routes",
			logger.E(err),
		)
	}

	logger.Info(ctx, "listening", logger.F("address", conf.HTTP.Address))
	if err := http.ListenAndServe(conf.HTTP.Address, r); err != nil {
		logger.Fatal(
			ctx,
			"could not listen",
			logger.E(err),
			logger.F("address", conf.HTTP.Address),
		)
	}
}