overhaul config, refactor twitch labels, init satellite

config/config.go

@@ -1,8 +1,25 @@
 package config
 
 import (
+	"fmt"
 	"os"
 	"path"
+
+	"github.com/pelletier/go-toml/v2"
+)
+
+type (
+	TwitchConfig struct {
+		ChannelName string `toml:"channel_name"`
+		ClientID string `toml:"client_id"`
+		ClientSecret string `toml:"client_secret"`
+	}
+
+	Config struct {
+		Host string `toml:"host"`
+		Port int16 `toml:"port"`
+		Twitch TwitchConfig `toml:"twitch"`
+	}
 )
 
 var CONFIG_DIR = func() string {
@@ -11,3 +28,40 @@ var CONFIG_DIR = func() string {
 	if err := os.MkdirAll(dir, 0750); err != nil { panic(err) }
 	return dir
 }()
+var configFilePath = path.Join(CONFIG_DIR, "config.toml")
+
+var DEFAULT_HOST string = "127.0.0.1"
+var DEFAULT_PORT int16 = 8080
+
+func DefaultConfig() *Config {
+	return &Config{
+		Host: DEFAULT_HOST,
+		Port: DEFAULT_PORT,
+		Twitch: TwitchConfig{
+			ChannelName: "",
+			ClientID: "",
+			ClientSecret: "",
+		},
+	}
+}
+
+func LoadConfig() (*Config, error) {
+	configFile, err := os.OpenFile(configFilePath, os.O_CREATE | os.O_RDWR, 0600)
+	if err != nil { return nil, fmt.Errorf("open %s: %v", configFilePath, err) }
+	defer configFile.Close()
+
+	config := DefaultConfig()
+	if stat, err := configFile.Stat(); err != nil {
+		return nil, fmt.Errorf("stat %s: %v", configFilePath, err)
+	} else if stat.Size() == 0 {
+		if err := toml.NewEncoder(configFile).Encode(config); err != nil {
+			return nil, fmt.Errorf("write %s: %v", configFilePath, err)
+		}
+		return config, nil
+	}
+
+	if err := toml.NewDecoder(configFile).Decode(config); err != nil {
+		return nil, fmt.Errorf("read %s: %v", configFilePath, err)
+	}
+	return config, nil
+}