midi-request-trigger/config.go

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package main
import (
"log"
"os"
"os/user"
"path"
"path/filepath"
"github.com/kkyr/fig"
)
// Configurations relating to HTTP server.
type HTTPConfig struct {
BindAddr string `fig:"bind_addr"`
Port uint `fig:"port"`
Debug bool `fig:"debug"`
APIKey string `fig:"api_key"`
Enabled bool `fig:"enabled"`
}
// Configuration Structure.
type Config struct {
HTTP HTTPConfig `fig:"http"`
MidiRouters []*MidiRouter `fig:"midi_routers"`
}
// Load the configuration.
func (a *App) ReadConfig() {
usr, err := user.Current()
if err != nil {
log.Fatal(err)
}
// Configuration paths.
localConfig, _ := filepath.Abs("./config.yaml")
homeDirConfig := usr.HomeDir + "/.config/midi-request-trigger/config.yaml"
etcConfig := "/etc/midi-request-trigger/config.yaml"
// Determine which configuration to use.
var configFile string
if _, err := os.Stat(app.flags.ConfigPath); err == nil && app.flags.ConfigPath != "" {
configFile = app.flags.ConfigPath
} else if _, err := os.Stat(localConfig); err == nil {
configFile = localConfig
} else if _, err := os.Stat(homeDirConfig); err == nil {
configFile = homeDirConfig
} else if _, err := os.Stat(etcConfig); err == nil {
configFile = etcConfig
} else {
log.Println("Unable to find a configuration file.")
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}
// Load the configuration file.
config := &Config{
HTTP: HTTPConfig{
BindAddr: "",
Port: 34936,
Debug: true,
Enabled: false,
},
}
// Load configuration.
filePath, fileName := path.Split(configFile)
err = fig.Load(config,
fig.File(fileName),
fig.Dirs(filePath),
)
if err != nil {
app.config = config
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log.Printf("Error parsing configuration: %s\n", err)
return
}
// Flag Overrides.
if app.flags.HTTPBind != "" {
config.HTTP.BindAddr = app.flags.HTTPBind
}
if app.flags.HTTPPort != 0 {
config.HTTP.Port = app.flags.HTTPPort
}
// Set global config structure.
app.config = config
}