fasten-onprem/backend/cmd/fasten/fasten.go

package main

import (
	"encoding/json"
	"fmt"
	"github.com/analogj/go-util/utils"
	"github.com/fastenhealth/fastenhealth-onprem/backend/pkg/config"
	"github.com/fastenhealth/fastenhealth-onprem/backend/pkg/errors"
	"github.com/fastenhealth/fastenhealth-onprem/backend/pkg/version"
	"github.com/fastenhealth/fastenhealth-onprem/backend/pkg/web"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli/v2"
	"io"
	"log"
	"os"
	"time"
)

var goos string
var goarch string

func main() {

	appconfig, err := config.Create()
	if err != nil {
		fmt.Printf("FATAL: %+v\n", err)
		os.Exit(1)
	}

	//we're going to load the config file manually, since we need to validate it.
	err = appconfig.ReadConfig("config.yaml")             // Find and read the config file
	if _, ok := err.(errors.ConfigFileMissingError); ok { // Handle errors reading the config file
		//ignore "could not find config file"
	} else if err != nil {
		os.Exit(1)
	}

	app := &cli.App{
		Name:     "goweb",
		Usage:    "Example go web application",
		Version:  version.VERSION,
		Compiled: time.Now(),
		Authors: []*cli.Author{
			{
				Name:  "Jason Kulatunga",
				Email: "jason@thesparktree.com",
			},
		},
		Before: func(c *cli.Context) error {

			packagrUrl := "github.com/fastenhealth/fastenhealth-onprem"

			versionInfo := fmt.Sprintf("%s.%s-%s", goos, goarch, version.VERSION)

			subtitle := packagrUrl + utils.LeftPad2Len(versionInfo, " ", 53-len(packagrUrl))

			fmt.Fprintf(c.App.Writer, fmt.Sprintf(utils.StripIndent(
				`
			 ____   __    ___  __ _   __    ___  ____ 
			(  _ \ / _\  / __)(  / ) / _\  / __)(  _ \
			 ) __//    \( (__  )  ( /    \( (_ \ )   /
			(__)  \_/\_/ \___)(__\_)\_/\_/ \___/(__\_)
			%s

			`), subtitle))
			return nil
		},

		Commands: []*cli.Command{
			{
				Name:  "start",
				Usage: "Start the fasten server",
				Action: func(c *cli.Context) error {
					//fmt.Fprintln(c.App.Writer, c.Command.Usage)
					if c.IsSet("config") {
						err = appconfig.ReadConfig(c.String("config")) // Find and read the config file
						if err != nil {                                // Handle errors reading the config file
							//ignore "could not find config file"
							fmt.Printf("Could not find config file at specified path: %s", c.String("config"))
							return err
						}
					}

					//process cli variables
					if c.IsSet("variable") {
						appconfig.Set("variable", c.String("variable"))
					}
					if c.Bool("debug") {
						appconfig.Set("log.level", "DEBUG")
					}
					if c.IsSet("log-file") {
						appconfig.Set("log.file", c.String("log-file"))
					}

					appLogger, logFile, err := CreateLogger(appconfig)
					if logFile != nil {
						defer logFile.Close()
					}
					if err != nil {
						return err
					}

					settingsData, err := json.Marshal(appconfig.AllSettings())
					appLogger.Debug(string(settingsData), err)

					webServer := web.AppEngine{Config: appconfig, Logger: appLogger}
					return webServer.Start()
				},

				Flags: []cli.Flag{
					&cli.StringFlag{
						Name:  "config",
						Usage: "Specify the path to the config file",
					},
					&cli.StringFlag{
						Name:  "variable",
						Value: "default",
						Usage: "The variable used by webserver",
					},
					&cli.StringFlag{
						Name:  "log-file",
						Usage: "Path to file for logging. Leave empty to use STDOUT",
						Value: "",
					},
					&cli.BoolFlag{
						Name:    "debug",
						Usage:   "Enable debug logging",
						EnvVars: []string{"DEBUG"},
					},
				},
			},
		},
	}

	err = app.Run(os.Args)
	if err != nil {
		log.Fatalf("ERROR: %v", err)
	}
}

func CreateLogger(appConfig config.Interface) (*logrus.Entry, *os.File, error) {
	logger := logrus.WithFields(logrus.Fields{
		"type": "web",
	})
	//set default log level
	if level, err := logrus.ParseLevel(appConfig.GetString("log.level")); err == nil {
		logger.Logger.SetLevel(level)
	} else {
		logger.Logger.SetLevel(logrus.InfoLevel)
	}

	var logFile *os.File
	var err error
	if appConfig.IsSet("log.file") && len(appConfig.GetString("log.file")) > 0 {
		logFile, err = os.OpenFile(appConfig.GetString("log.file"), os.O_CREATE|os.O_WRONLY, 0644)
		if err != nil {
			logger.Logger.Errorf("Failed to open log file %s for output: %s", appConfig.GetString("log.file"), err)
			return nil, logFile, err
		}
		logger.Logger.SetOutput(io.MultiWriter(os.Stderr, logFile))
	}
	return logger, logFile, nil
}