TUN-4922: Downgrade quic-go library to 0.20.0

vendor/github.com/lucas-clemente/quic-go/logging/close_reason.go

@@ -0,0 +1,78 @@
+package logging
+
+// A CloseReason is the reason why a QUIC connection is closed.
+// It falls in one of 4 categories:
+// 1. The application closed the connection (with an application-specific error code).
+// 2. The transport closed the connection with a transport-error code.
+// 3. The connection timed out, either during the handshake, or due to an idle timeout.
+// 4. A stateless reset was received.
+type CloseReason struct {
+	remote           bool
+	applicationError *ApplicationError
+	transportError   *TransportError
+
+	timeout             *TimeoutReason
+	statelessResetToken *StatelessResetToken
+	versions            []VersionNumber
+}
+
+// NewApplicationCloseReason creates a new CloseReason for an application error.
+func NewApplicationCloseReason(errorCode ApplicationError, remote bool) CloseReason {
+	return CloseReason{remote: remote, applicationError: &errorCode}
+}
+
+// NewTransportCloseReason creates a new CloseReason for a transport error.
+func NewTransportCloseReason(errorCode TransportError, remote bool) CloseReason {
+	return CloseReason{remote: remote, transportError: &errorCode}
+}
+
+// NewTimeoutCloseReason creates a new CloseReason for a connection timeout.
+func NewTimeoutCloseReason(r TimeoutReason) CloseReason {
+	return CloseReason{timeout: &r}
+}
+
+// NewStatelessResetCloseReason creates a new CloseReason for a stateless reset.
+func NewStatelessResetCloseReason(token StatelessResetToken) CloseReason {
+	return CloseReason{statelessResetToken: &token}
+}
+
+// NewVersionNegotiationError creates a new CloseReason for a version negotiation error.
+func NewVersionNegotiationError(versions []VersionNumber) CloseReason {
+	return CloseReason{versions: versions}
+}
+
+// ApplicationError gets the application error.
+func (r *CloseReason) ApplicationError() (errorCode ApplicationError, remote bool, ok bool) {
+	if r.applicationError == nil {
+		return
+	}
+	return *r.applicationError, r.remote, true
+}
+
+// TransportError gets the transport error.
+func (r *CloseReason) TransportError() (errorCode TransportError, remote bool, ok bool) {
+	if r.transportError == nil {
+		return
+	}
+	return *r.transportError, r.remote, true
+}
+
+// Timeout gets the timeout error.
+func (r *CloseReason) Timeout() (reason TimeoutReason, ok bool) {
+	if r.timeout == nil {
+		return
+	}
+	return *r.timeout, true
+}
+
+// StatelessReset gets the stateless reset token.
+func (r *CloseReason) StatelessReset() (token StatelessResetToken, ok bool) {
+	if r.statelessResetToken == nil {
+		return
+	}
+	return *r.statelessResetToken, true
+}
+
+func (r *CloseReason) VersionNegotiation() (versions []VersionNumber, ok bool) {
+	return r.versions, len(r.versions) > 0
+}