73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
package config
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
type Config struct {
|
|
ScreenID string `json:"screen_id"`
|
|
ServerBaseURL string `json:"server_base_url"`
|
|
MQTTBroker string `json:"mqtt_broker"`
|
|
HeartbeatEvery int `json:"heartbeat_every_seconds"`
|
|
}
|
|
|
|
const defaultConfigPath = "/etc/signage/config.json"
|
|
|
|
func Load() (Config, error) {
|
|
cfg := defaultConfig()
|
|
|
|
configPath := getenv("MORZ_INFOBOARD_CONFIG", defaultConfigPath)
|
|
if err := loadFromFile(configPath, &cfg); err != nil {
|
|
if !os.IsNotExist(err) {
|
|
return Config{}, fmt.Errorf("load config file: %w", err)
|
|
}
|
|
}
|
|
|
|
overrideFromEnv(&cfg)
|
|
|
|
if cfg.ScreenID == "" {
|
|
return Config{}, fmt.Errorf("screen id is required")
|
|
}
|
|
|
|
if cfg.HeartbeatEvery <= 0 {
|
|
cfg.HeartbeatEvery = defaultConfig().HeartbeatEvery
|
|
}
|
|
|
|
return cfg, nil
|
|
}
|
|
|
|
|
|
func defaultConfig() Config {
|
|
return Config{
|
|
ScreenID: "unset-screen",
|
|
ServerBaseURL: "http://127.0.0.1:8080",
|
|
MQTTBroker: "tcp://127.0.0.1:1883",
|
|
HeartbeatEvery: 30,
|
|
}
|
|
}
|
|
|
|
func loadFromFile(path string, cfg *Config) error {
|
|
data, err := os.ReadFile(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return json.Unmarshal(data, cfg)
|
|
}
|
|
|
|
func overrideFromEnv(cfg *Config) {
|
|
cfg.ScreenID = getenv("MORZ_INFOBOARD_SCREEN_ID", cfg.ScreenID)
|
|
cfg.ServerBaseURL = getenv("MORZ_INFOBOARD_SERVER_URL", cfg.ServerBaseURL)
|
|
cfg.MQTTBroker = getenv("MORZ_INFOBOARD_MQTT_BROKER", cfg.MQTTBroker)
|
|
}
|
|
|
|
func getenv(key, fallback string) string {
|
|
value := os.Getenv(key)
|
|
if value == "" {
|
|
return fallback
|
|
}
|
|
|
|
return value
|
|
}
|