Add functions to get config values

cli/cli.go

@@ -26,8 +26,8 @@ func Parse() {
 
 	cfg := config.NewConfig()
 	store := storage.NewStorage(
-		cfg.Get("DATABASE_URL", config.DefaultDatabaseURL),
+		cfg.DatabaseURL(),
-		cfg.GetInt("DATABASE_MAX_CONNS", config.DefaultDatabaseMaxConns),
+		cfg.DatabaseMaxConnections(),
 	)
 
 	if *flagInfo {

config/config.go

@@ -51,6 +51,66 @@ func (c *Config) GetInt(key string, fallback int) int {
 	return v
 }
 
+// BaseURL returns the application base URL.
+func (c *Config) BaseURL() string {
+	return c.Get("BASE_URL", DefaultBaseURL)
+}
+
+// DatabaseURL returns the database URL.
+func (c *Config) DatabaseURL() string {
+	return c.Get("DATABASE_URL", DefaultDatabaseURL)
+}
+
+// DatabaseMaxConnections returns the number of maximum database connections.
+func (c *Config) DatabaseMaxConnections() int {
+	return c.GetInt("DATABASE_MAX_CONNS", DefaultDatabaseMaxConns)
+}
+
+// ListenAddr returns the listen address for the HTTP server.
+func (c *Config) ListenAddr() string {
+	return c.Get("LISTEN_ADDR", DefaultListenAddr)
+}
+
+// CertFile returns the SSL certificate filename if any.
+func (c *Config) CertFile() string {
+	return c.Get("CERT_FILE", DefaultCertFile)
+}
+
+// KeyFile returns the private key filename for custom SSL certificate.
+func (c *Config) KeyFile() string {
+	return c.Get("KEY_FILE", DefaultKeyFile)
+}
+
+// CertDomain returns the domain to use for Let's Encrypt certificate.
+func (c *Config) CertDomain() string {
+	return c.Get("CERT_DOMAIN", DefaultCertDomain)
+}
+
+// CertCache returns the directory to use for Let's Encrypt session cache.
+func (c *Config) CertCache() string {
+	return c.Get("CERT_CACHE", DefaultCertCache)
+}
+
+// SessionCleanupFrequency returns the interval for session cleanup.
+func (c *Config) SessionCleanupFrequency() int {
+	return c.GetInt("SESSION_CLEANUP_FREQUENCY", DefaultSessionCleanupFrequency)
+}
+
+// WorkerPoolSize returns the number of background worker.
+func (c *Config) WorkerPoolSize() int {
+	return c.GetInt("WORKER_POOL_SIZE", DefaultWorkerPoolSize)
+}
+
+// PollingFrequency returns the interval to refresh feeds in the background.
+func (c *Config) PollingFrequency() int {
+	return c.GetInt("POLLING_FREQUENCY", DefaultPollingFrequency)
+}
+
+// BatchSize returns the number of feeds to send for background processing.
+func (c *Config) BatchSize() int {
+	return c.GetInt("BATCH_SIZE", DefaultBatchSize)
+}
+
 // NewConfig returns a new Config.
 func NewConfig() *Config {
 	return &Config{IsHTTPS: os.Getenv("HTTPS") != ""}

daemon/daemon.go

@@ -27,17 +27,17 @@ func Run(cfg *config.Config, store *storage.Storage) {
 	signal.Notify(stop, syscall.SIGTERM)
 
 	feedHandler := feed.NewFeedHandler(store)
-	pool := scheduler.NewWorkerPool(feedHandler, cfg.GetInt("WORKER_POOL_SIZE", config.DefaultWorkerPoolSize))
+	pool := scheduler.NewWorkerPool(feedHandler, cfg.WorkerPoolSize())
 	server := newServer(cfg, store, pool, feedHandler)
 
 	scheduler.NewFeedScheduler(
 		store,
 		pool,
-		cfg.GetInt("POLLING_FREQUENCY", config.DefaultPollingFrequency),
+		cfg.PollingFrequency(),
-		cfg.GetInt("BATCH_SIZE", config.DefaultBatchSize),
+		cfg.BatchSize(),
 	)
 
-	scheduler.NewSessionScheduler(store, config.DefaultSessionCleanupFrequency)
+	scheduler.NewSessionScheduler(store, cfg.SessionCleanupFrequency())
 
 	<-stop
 	logger.Info("Shutting down the server...")

daemon/server.go

@@ -19,15 +19,15 @@ import (
 )
 
 func newServer(cfg *config.Config, store *storage.Storage, pool *scheduler.WorkerPool, feedHandler *feed.Handler) *http.Server {
-	certFile := cfg.Get("CERT_FILE", config.DefaultCertFile)
+	certFile := cfg.CertFile()
-	keyFile := cfg.Get("KEY_FILE", config.DefaultKeyFile)
+	keyFile := cfg.KeyFile()
-	certDomain := cfg.Get("CERT_DOMAIN", config.DefaultCertDomain)
+	certDomain := cfg.CertDomain()
-	certCache := cfg.Get("CERT_CACHE", config.DefaultCertCache)
+	certCache := cfg.CertCache()
 	server := &http.Server{
 		ReadTimeout:  5 * time.Second,
 		WriteTimeout: 10 * time.Second,
 		IdleTimeout:  60 * time.Second,
-		Addr:         cfg.Get("LISTEN_ADDR", config.DefaultListenAddr),
+		Addr:         cfg.ListenAddr(),
 		Handler:      routes(cfg, store, feedHandler, pool),
 	}
 

template/template.go

@@ -36,7 +36,7 @@ type Engine struct {
 func (e *Engine) parseAll() {
 	funcMap := template.FuncMap{
 		"baseURL": func() string {
-			return e.cfg.Get("BASE_URL", config.DefaultBaseURL)
+			return e.cfg.BaseURL()
 		},
 		"hasOAuth2Provider": func(provider string) bool {
 			return e.cfg.Get("OAUTH2_PROVIDER", "") == provider