99 lines
2.4 KiB
Go
99 lines
2.4 KiB
Go
//loads environment-based configuration.
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package config
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import (
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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const (
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defaultPort = 3001
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defaultDBPort = 5432
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defaultPollIntervalMS = 60000
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minPollIntervalMS = 1000
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)
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type Config struct {
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Port int
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APIBasePath string
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DatabaseURL string
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DBHost string
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DBPort int
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DBUser string
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DBPassword string
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DBName string
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FirebaseProjectID string
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EthRPCURL string
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PollIntervalMS int
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NodeEnv string
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ResendAPIKey string
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EmailFrom string
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}
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// Load reads configuration from environment variables and returns a Config.
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func Load() (*Config, error) {
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cfg := &Config{
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Port: getEnvInt("PORT", defaultPort),
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APIBasePath: getEnv("API_BASE_PATH", "/v1"),
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DatabaseURL: os.Getenv("DATABASE_URL"),
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DBHost: getEnv("DB_HOST", "localhost"),
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DBPort: getEnvInt("DB_PORT", defaultDBPort),
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DBUser: os.Getenv("DB_USER"),
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DBPassword: os.Getenv("DB_PASSWORD"),
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DBName: os.Getenv("DB_NAME"),
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FirebaseProjectID: os.Getenv("FIREBASE_PROJECT_ID"),
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EthRPCURL: os.Getenv("ETH_RPC_URL"),
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PollIntervalMS: getEnvInt("POLL_INTERVAL_MS", defaultPollIntervalMS),
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NodeEnv: getEnv("NODE_ENV", "development"),
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ResendAPIKey: os.Getenv("RESEND_API_KEY"),
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EmailFrom: getEnv("EMAIL_FROM", "Koin Ping <alerts@koinping.com>"),
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}
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if cfg.PollIntervalMS < minPollIntervalMS {
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return nil, fmt.Errorf("POLL_INTERVAL_MS must be >= 1000, got %d", cfg.PollIntervalMS) //nolint:err113
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}
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return cfg, nil
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}
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func (c *Config) DSN() string {
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if c.DatabaseURL != "" {
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// Append sslmode=disable if not already specified.
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if !strings.Contains(c.DatabaseURL, "sslmode=") {
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sep := "?"
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if strings.Contains(c.DatabaseURL, "?") {
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sep = "&"
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}
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return c.DatabaseURL + sep + "sslmode=disable"
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}
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return c.DatabaseURL
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}
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return fmt.Sprintf(
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"host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
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c.DBHost, c.DBPort, c.DBUser, c.DBPassword, c.DBName,
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)
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}
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func getEnv(key, fallback string) string {
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if v := os.Getenv(key); v != "" {
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return v
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}
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return fallback
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}
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func getEnvInt(key string, fallback int) int {
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if v := os.Getenv(key); v != "" {
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if n, err := strconv.Atoi(v); err == nil {
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return n
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}
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}
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return fallback
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}
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