fix now-playing status on listenbrainz endpoint and add config support

config/config.go

@@ -0,0 +1,71 @@
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/BurntSushi/toml"
+)
+
+type Config struct {
+	Server   ServerConfig
+	Database DatabaseConfig
+}
+
+type ServerConfig struct {
+	Address string
+}
+
+type DatabaseConfig struct {
+	Host     string
+	Port     string
+	User     string
+	Password string
+	Name     string
+}
+
+var cfg *Config
+
+func LoadConfig() (*Config, error) {
+	cfg = &Config{
+		Server: ServerConfig{
+			Address: "0.0.0.0:1234",
+		},
+		Database: DatabaseConfig{
+			Host:     "localhost",
+			Port:     "5432",
+			User:     "postgres",
+			Password: "postgres",
+			Name:     "muzi",
+		},
+	}
+
+	if _, err := os.Stat("config.toml"); err == nil {
+		_, err := toml.DecodeFile("config.toml", cfg)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing config.toml: %w", err)
+		}
+	}
+
+	return cfg, nil
+}
+
+func Get() *Config {
+	if cfg == nil {
+		var err error
+		cfg, err = LoadConfig()
+		if err != nil {
+			panic(fmt.Sprintf("failed to load config: %v", err))
+		}
+	}
+	return cfg
+}
+
+func (d *DatabaseConfig) GetDbUrl(withDb bool) string {
+	if withDb {
+		return fmt.Sprintf("postgres://%s:%s@%s:%s/%s",
+			d.User, d.Password, d.Host, d.Port, d.Name)
+	}
+	return fmt.Sprintf("postgres://%s:%s@%s:%s",
+		d.User, d.Password, d.Host, d.Port)
+}