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Copy pathmain.go
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77 lines (60 loc) · 1.98 KB
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// Package main provides the application entrypoint as well as functions for
// parsing CLI flags and environment variables.
package main
import (
"log"
"strings"
"github.com/dominikbraun/todo/core"
"github.com/dominikbraun/todo/server"
"github.com/dominikbraun/todo/storage"
"github.com/spf13/pflag"
"github.com/spf13/viper"
)
// config stores all configuration values required to run the ToDo app.
type config struct {
mariaDB storage.MariaDBConfig
serverPort uint
}
func main() {
flags := parseApplicationConfig()
mariaDB, err := storage.NewMariaDB(flags.mariaDB)
if err != nil {
log.Fatal(err)
}
if err := mariaDB.Initialize(); err != nil {
log.Fatal(err)
}
app := core.NewApp(mariaDB)
srv := server.New(flags.serverPort, app)
log.Printf("serving app on port %d\n", flags.serverPort)
if err := srv.Run(); err != nil {
log.Fatal(err)
}
}
// parseApplicationConfig parses the application configuration from multiple
// sources. Currently, these sources are CLI flags and environment variables.
//
// A configuration value like `port` can either be passed to the binary as a
// --port flag or specified as a TODO_PORT environment variable.
func parseApplicationConfig() config {
pflag.String("mariadb-user", "admin", "The MariaDB user")
pflag.String("mariadb-password", "admin", "The MariaDB password")
pflag.String("mariadb-address", "0.0.0.0:3306", "The MariaDB address")
pflag.String("mariadb-dbname", "todo_app", "The MariaDB database name")
pflag.Uint("port", 8000, "The port the server should listen on")
pflag.Parse()
_ = viper.BindPFlags(pflag.CommandLine)
viper.AutomaticEnv()
viper.SetEnvPrefix("TODO")
viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
flags := config{
mariaDB: storage.MariaDBConfig{
User: viper.GetString("mariadb-user"),
Password: viper.GetString("mariadb-password"),
Address: viper.GetString("mariadb-address"),
DBName: viper.GetString("mariadb-dbname"),
},
serverPort: viper.GetUint("port"),
}
return flags
}