first push of

pi/roverd/config.go

@@ -0,0 +1,118 @@
+package roverd
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"time"
+
+	"gopkg.in/yaml.v3"
+)
+
+type SerialConfig struct {
+	Device string `yaml:"device"`
+	Baud   int    `yaml:"baud"`
+}
+
+type Duration struct {
+	time.Duration
+}
+
+func (d *Duration) UnmarshalYAML(value *yaml.Node) error {
+	var raw string
+	if err := value.Decode(&raw); err != nil {
+		return err
+	}
+	parsed, err := time.ParseDuration(raw)
+	if err != nil {
+		return err
+	}
+	d.Duration = parsed
+	return nil
+}
+
+func (d Duration) MarshalYAML() (interface{}, error) {
+	return d.Duration.String(), nil
+}
+
+type BRCConfig struct {
+	GPIOPin    int      `yaml:"gpioPin"`
+	PulseEvery Duration `yaml:"pulseEvery"`
+	PulseWidth Duration `yaml:"pulseWidth"`
+}
+
+func (b BRCConfig) Enabled() bool {
+	return b.GPIOPin >= 0
+}
+
+type BatteryConfig struct {
+	Full   int `yaml:"full"`
+	Warn   int `yaml:"warn"`
+	Urgent int `yaml:"urgent"`
+}
+
+type MediaConfig struct {
+	WhepURL        string   `yaml:"whepUrl"`
+	StreamKey      string   `yaml:"streamKey"`
+	Manage         bool     `yaml:"manage"`
+	Service        string   `yaml:"service"`
+	HealthURL      string   `yaml:"healthUrl"`
+	HealthInterval Duration `yaml:"healthInterval"`
+}
+
+type Config struct {
+	Name        string        `yaml:"name"`
+	ServerURL   string        `yaml:"serverUrl"`
+	Serial      SerialConfig  `yaml:"serial"`
+	BRC         BRCConfig     `yaml:"brc"`
+	Battery     BatteryConfig `yaml:"battery"`
+	MaxWheelMMs int           `yaml:"maxWheelSpeed"`
+	Media       MediaConfig   `yaml:"media"`
+}
+
+func LoadConfig(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	cfg := Config{
+		MaxWheelMMs: 500,
+		BRC: BRCConfig{
+			GPIOPin: -1,
+			PulseEvery: Duration{
+				Duration: time.Minute,
+			},
+			PulseWidth: Duration{
+				Duration: time.Second,
+			},
+		},
+		Media: MediaConfig{
+			HealthInterval: Duration{Duration: 30 * time.Second},
+		},
+	}
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, err
+	}
+	if cfg.Name == "" {
+		return nil, errors.New("missing name")
+	}
+	if cfg.ServerURL == "" {
+		return nil, errors.New("missing serverUrl")
+	}
+	if cfg.Serial.Device == "" || cfg.Serial.Baud == 0 {
+		return nil, errors.New("serial device/baud required")
+	}
+	if cfg.Battery.Full == 0 {
+		return nil, errors.New("battery thresholds required")
+	}
+	if cfg.MaxWheelMMs <= 0 || cfg.MaxWheelMMs > 500 {
+		return nil, fmt.Errorf("maxWheelSpeed must be 1-500, got %d", cfg.MaxWheelMMs)
+	}
+	if cfg.Media.Manage && cfg.Media.Service == "" {
+		return nil, errors.New("media.manage requires media.service")
+	}
+	if cfg.Media.Manage && cfg.Media.HealthInterval.Duration <= 0 {
+		cfg.Media.HealthInterval = Duration{Duration: 30 * time.Second}
+	}
+	return &cfg, nil
+}