forked from 0x2E/fusion
41784ec681
It feels a bit messy that the entire program has write access to the configuration as a shared global object. Shared globals make it more difficult to reason about a program's behavior. This rewrite reduces the problem a bit by making the shared global state read-only after the client calls conf.Load.
70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
package conf
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import (
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"errors"
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"fmt"
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"log"
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"os"
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"github.com/caarlos0/env/v11"
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"github.com/joho/godotenv"
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)
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const (
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Debug = false
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dotEnvFilename = ".env"
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)
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var conf struct {
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Host string `env:"HOST" envDefault:"0.0.0.0"`
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Port int `env:"PORT" envDefault:"8080"`
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Password string `env:"PASSWORD"`
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DB string `env:"DB" envDefault:"fusion.db"`
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SecureCookie bool `env:"SECURE_COOKIE" envDefault:"false"`
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TLSCert string `env:"TLS_CERT"`
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TLSKey string `env:"TLS_KEY"`
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}
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func Host() string { return conf.Host }
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func Port() int { return conf.Port }
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func Password() string { return conf.Password }
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func DB() string { return conf.DB }
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func SecureCookie() bool { return conf.SecureCookie }
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func TLSCert() string { return conf.TLSCert }
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func TLSKey() string { return conf.TLSKey }
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func Load() {
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if err := godotenv.Load(dotEnvFilename); err != nil {
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if !os.IsNotExist(err) {
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panic(err)
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}
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log.Printf("no configuration file found at %s", dotEnvFilename)
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} else {
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log.Printf("read configuration from %s", dotEnvFilename)
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}
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if err := env.Parse(&conf); err != nil {
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panic(err)
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}
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if err := validate(); err != nil {
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panic(err)
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}
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if Debug {
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fmt.Println(conf)
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}
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}
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func validate() error {
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if conf.Password == "" {
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return errors.New("password is required")
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}
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if (conf.TLSCert == "") != (conf.TLSKey == "") {
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return errors.New("missing TLS cert or key file")
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}
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if conf.TLSCert != "" {
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conf.SecureCookie = true
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}
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return nil
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}
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