feat: game lobby service

lobby/internal/config/validation.go

@@ -0,0 +1,88 @@
+package config
+
+import (
+	"fmt"
+	"log/slog"
+	"net"
+	"net/url"
+	"strings"
+)
+
+// Validate reports whether cfg stores a usable Game Lobby Service process
+// configuration.
+func (cfg Config) Validate() error {
+	if cfg.ShutdownTimeout <= 0 {
+		return fmt.Errorf("%s must be positive", shutdownTimeoutEnvVar)
+	}
+	if err := validateSlogLevel(cfg.Logging.Level); err != nil {
+		return fmt.Errorf("%s: %w", logLevelEnvVar, err)
+	}
+	if err := cfg.PublicHTTP.Validate(); err != nil {
+		return err
+	}
+	if err := cfg.InternalHTTP.Validate(); err != nil {
+		return err
+	}
+	if err := cfg.Redis.Validate(); err != nil {
+		return err
+	}
+	if err := cfg.UserService.Validate(); err != nil {
+		return err
+	}
+	if err := cfg.GM.Validate(); err != nil {
+		return err
+	}
+	if err := cfg.EnrollmentAutomation.Validate(); err != nil {
+		return err
+	}
+	if err := cfg.RaceNameDirectory.Validate(); err != nil {
+		return fmt.Errorf("%s: %w", raceNameDirectoryBackendEnvVar, err)
+	}
+	if err := cfg.PendingRegistration.Validate(); err != nil {
+		return fmt.Errorf("%s: %w", raceNameExpirationIntervalEnvVar, err)
+	}
+	if err := cfg.Telemetry.Validate(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func validateSlogLevel(level string) error {
+	var slogLevel slog.Level
+	if err := slogLevel.UnmarshalText([]byte(strings.TrimSpace(level))); err != nil {
+		return fmt.Errorf("invalid slog level %q: %w", level, err)
+	}
+
+	return nil
+}
+
+func isTCPAddr(value string) bool {
+	host, port, err := net.SplitHostPort(strings.TrimSpace(value))
+	if err != nil {
+		return false
+	}
+
+	if port == "" {
+		return false
+	}
+
+	if host == "" {
+		return true
+	}
+
+	return !strings.Contains(host, " ")
+}
+
+func isHTTPURL(value string) bool {
+	parsed, err := url.Parse(strings.TrimSpace(value))
+	if err != nil {
+		return false
+	}
+
+	if parsed.Scheme != "http" && parsed.Scheme != "https" {
+		return false
+	}
+
+	return parsed.Host != ""
+}