初版功能完成

internal/protocol/error_code.go

@@ -0,0 +1,62 @@
+package protocol
+
+// ErrorCode is a stable machine-readable RemLink failure identifier.
+type ErrorCode string
+
+const (
+	ErrorServerUnreachable     ErrorCode = "SERVER_UNREACHABLE"
+	ErrorJoinTokenInvalid      ErrorCode = "JOIN_TOKEN_INVALID"
+	ErrorNodeAuthFailed        ErrorCode = "NODE_AUTH_FAILED"
+	ErrorOverlayLocalConflict  ErrorCode = "OVERLAY_LOCAL_CONFLICT"
+	ErrorEngineerSessionExists ErrorCode = "ENGINEER_SESSION_EXISTS"
+	ErrorSiteOffline           ErrorCode = "SITE_OFFLINE"
+	ErrorCIDRInvalid           ErrorCode = "CIDR_INVALID"
+	ErrorCIDRLocalConflict     ErrorCode = "CIDR_LOCAL_CONFLICT"
+	ErrorCIDROverlayConflict   ErrorCode = "CIDR_OVERLAY_CONFLICT"
+	ErrorSiteNoRoute           ErrorCode = "SITE_NO_ROUTE"
+	ErrorNetstackUnavailable   ErrorCode = "NETSTACK_UNAVAILABLE"
+	ErrorFlowLimitReached      ErrorCode = "FLOW_LIMIT_REACHED"
+	ErrorSessionTimeout        ErrorCode = "SESSION_TIMEOUT"
+	ErrorSessionInjectFailed   ErrorCode = "SESSION_INJECT_FAILED"
+)
+
+// ErrorCodes is the authoritative 14-code v1 baseline.
+var ErrorCodes = [...]ErrorCode{
+	ErrorServerUnreachable,
+	ErrorJoinTokenInvalid,
+	ErrorNodeAuthFailed,
+	ErrorOverlayLocalConflict,
+	ErrorEngineerSessionExists,
+	ErrorSiteOffline,
+	ErrorCIDRInvalid,
+	ErrorCIDRLocalConflict,
+	ErrorCIDROverlayConflict,
+	ErrorSiteNoRoute,
+	ErrorNetstackUnavailable,
+	ErrorFlowLimitReached,
+	ErrorSessionTimeout,
+	ErrorSessionInjectFailed,
+}
+
+// Valid reports whether the code belongs to the v1 baseline.
+func (c ErrorCode) Valid() bool {
+	switch c {
+	case ErrorServerUnreachable,
+		ErrorJoinTokenInvalid,
+		ErrorNodeAuthFailed,
+		ErrorOverlayLocalConflict,
+		ErrorEngineerSessionExists,
+		ErrorSiteOffline,
+		ErrorCIDRInvalid,
+		ErrorCIDRLocalConflict,
+		ErrorCIDROverlayConflict,
+		ErrorSiteNoRoute,
+		ErrorNetstackUnavailable,
+		ErrorFlowLimitReached,
+		ErrorSessionTimeout,
+		ErrorSessionInjectFailed:
+		return true
+	default:
+		return false
+	}
+}