first commit

internal/config/config.go

@@ -0,0 +1,86 @@
+package config
+
+import (
+	"errors"
+	"os"
+	"time"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	LogLevel string `yaml:"log_level"`
+
+	MQTT struct {
+		Broker   string `yaml:"broker"`
+		ClientID string `yaml:"client_id"`
+		Username string `yaml:"username"`
+		Password string `yaml:"password"`
+		Topic    string `yaml:"topic"`
+		QoS      byte   `yaml:"qos"`
+	} `yaml:"mqtt"`
+
+	DB struct {
+		ConnString string `yaml:"conn_string"`
+	} `yaml:"db"`
+
+	Site struct {
+		Name       string  `yaml:"name"`
+		Latitude   float64 `yaml:"latitude"`
+		Longitude  float64 `yaml:"longitude"`
+		ElevationM float64 `yaml:"elevation_m"`
+	} `yaml:"site"`
+
+	Pollers struct {
+		OpenMeteo struct {
+			Enabled  bool          `yaml:"enabled"`
+			Interval time.Duration `yaml:"interval"`
+			Model    string        `yaml:"model"`
+		} `yaml:"open_meteo"`
+	} `yaml:"pollers"`
+
+	Wunderground struct {
+		Enabled    bool          `yaml:"enabled"`
+		StationID  string        `yaml:"station_id"`
+		StationKey string        `yaml:"station_key"`
+		Interval   time.Duration `yaml:"interval"`
+	} `yaml:"wunderground"`
+}
+
+func Load(path string) (*Config, error) {
+	b, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var c Config
+	if err := yaml.Unmarshal(b, &c); err != nil {
+		return nil, err
+	}
+
+	// Minimal validation
+	if c.MQTT.Broker == "" || c.MQTT.Topic == "" {
+		return nil, errors.New("mqtt broker and topic are required")
+	}
+	if c.DB.ConnString == "" {
+		return nil, errors.New("db conn_string is required")
+	}
+	if c.Site.Name == "" {
+		c.Site.Name = "default"
+	}
+	if c.Pollers.OpenMeteo.Model == "" {
+		c.Pollers.OpenMeteo.Model = "ecmwf"
+	}
+	if c.Pollers.OpenMeteo.Interval == 0 {
+		c.Pollers.OpenMeteo.Interval = 30 * time.Minute
+	}
+	if c.Wunderground.Interval == 0 {
+		c.Wunderground.Interval = 60 * time.Second
+	}
+	// If enabled, require creds
+	if c.Wunderground.Enabled && (c.Wunderground.StationID == "" || c.Wunderground.StationKey == "") {
+		return nil, errors.New("wunderground enabled but station_id/station_key not set")
+	}
+
+	return &c, nil
+}