logbot3/internal/config/config.go

package config

import (
	"encoding/json"
	"fmt"
	"os"
	"sync"
)

// Config represents the logbot's configuration.
type Config struct {
	Bot struct {
		Nicks          []string `json:"nicks"`
		Server         string   `json:"server"`
		CommandChannel string   `json:"commandChannel"`
	} `json:"bot"`
	API struct {
		Endpoint string `json:"endpoint"`
		Username string `json:"username"`
		Key      struct {
			ID     string `json:"id"`
			Secret string `json:"secret"`
		} `json:"key"`
	} `json:"api"`
}

var mutex sync.Mutex
var config *Config

// Get lazy-loads the configuration in a thread-safe manner.
func Get() Config {
	mutex.Lock()
	defer mutex.Unlock()

	if config == nil {
		config = &Config{}

		file, err := os.Open("/etc/aiterp/logbot3.json")
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to load config: %s\n", err)
			os.Exit(1)
		}
		defer file.Close()

		err = json.NewDecoder(file).Decode(&config)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to parse config: %s\n", err)
			os.Exit(1)
		}
	}

	return *config
}