answerer/app/app.go

package app

import (
	"context"
	"errors"
	"fmt"
	"gitea.pena/SQuiz/answerer/clients"
	"gitea.pena/SQuiz/answerer/service"
	"gitea.pena/SQuiz/common/dal"
	"gitea.pena/SQuiz/common/healthchecks"
	"gitea.pena/SQuiz/common/middleware"
	"gitea.pena/SQuiz/common/utils"
	"github.com/gofiber/fiber/v2"
	"github.com/skeris/appInit"
	"go.uber.org/zap"
)

type App struct {
	logger *zap.Logger
	err    chan error
}

func (a App) GetLogger() *zap.Logger {
	return a.logger
}

func (a App) GetErr() chan error {
	return a.err
}

var (
	errInvalidOptions = errors.New("invalid options")
)

var zapOptions = []zap.Option{
	zap.AddCaller(),
	zap.AddCallerSkip(2),
	zap.AddStacktrace(zap.ErrorLevel),
}

var _ appInit.CommonApp = (*App)(nil)

type Options struct {
	LoggerProdMode      bool   `env:"IS_PROD_LOG" default:"false"`
	IsProd              bool   `env:"IS_PROD" default:"false"`
	NumberPort          string `env:"PORT" default:"1490"`
	CrtFile             string `env:"CRT" default:"server.crt"`
	KeyFile             string `env:"KEY" default:"server.key"`
	PostgresCredentials string `env:"PG_CRED" default:"host=localhost port=5432 user=squiz password=Redalert2 dbname=squiz sslmode=disable"`
	RedirectURL         string `env:"REDIRECT_URL" default:"https://squiz.pena.digital"`
	PubKey              string `env:"PUBLIC_KEY"`
	PrivKey             string `env:"PRIVATE_KEY"`
}

func New(ctx context.Context, opts interface{}, ver appInit.Version) (appInit.CommonApp, error) {
	var (
		err, workerErr error
		zapLogger      *zap.Logger
		errChan        = make(chan error)
		options        Options
		ok             bool
	)

	if options, ok = opts.(Options); !ok {
		return App{}, errInvalidOptions
	}

	if options.LoggerProdMode {
		zapLogger, err = zap.NewProduction(zapOptions...)
		if err != nil {
			return nil, err
		}
	} else {
		zapLogger, err = zap.NewDevelopment(zapOptions...)
		if err != nil {
			return nil, err
		}
	}

	zapLogger = zapLogger.With(
		zap.String("SvcCommit", ver.Commit),
		zap.String("SvcVersion", ver.Release),
		zap.String("SvcBuildTime", ver.BuildTime),
	)

	pgdal, err := dal.New(ctx, options.PostgresCredentials, nil)
	if err != nil {
		return nil, err
	}

	zapLogger.Info("config", zap.Any("options", options))

	encrypt := utils.NewEncrypt(options.PubKey, options.PrivKey)

	svc, err := service.New(service.ServiceDeps{
		Dal:         pgdal,
		Encrypt:     encrypt,
		RedirectURl: options.RedirectURL,
		AiClient:    clients.NewAiClient("https://alvatar.com/api/engine/send_answer"),
	})
	if err != nil {
		zapLogger.Error("failed to create service", zap.Error(err))
		return nil, err
	}

	app := fiber.New(fiber.Config{BodyLimit: 70 * 1024 * 1024})

	app.Use(func(c *fiber.Ctx) error {
		defer func() {
			if err := recover(); err != nil {
				c.Status(fiber.StatusInternalServerError).SendString("internal server error")
			}
		}()
		return c.Next()
	})

	app.Use(middleware.AnswererChain())
	app.Get("/liveness", healthchecks.Liveness)
	app.Get("/readiness", healthchecks.Readiness(&workerErr)) //todo parametrized readiness. should discuss ready reason
	app = svc.Register(app)

	fmt.Println("SERVERSTART", fmt.Sprintf(":%s", options.NumberPort))

	go func() {
		defer func() {
			err := app.Shutdown()
			if err != nil {
				zapLogger.Error("failed graceful shutdown", zap.Error(err))
			}
		}()

		if options.IsProd {
			if err := app.ListenTLS(fmt.Sprintf(":%s", options.NumberPort), options.CrtFile, options.KeyFile); err != nil {
				zapLogger.Error("failed start server", zap.Error(err))
				errChan <- err
			}
		} else {
			if err := app.Listen(fmt.Sprintf(":%s", options.NumberPort)); err != nil {
				zapLogger.Error("failed start server", zap.Error(err))
				errChan <- err
			}
		}

		errChan <- nil
	}()
	// todo implement helper func for service app type. such as server preparing, logger preparing, healthchecks and etc.
	return &App{
		logger: zapLogger,
		err:    errChan,
	}, err
}