TUN-528: Move cloudflared into a separate repo

vendor/zombiezen.com/go/capnproto2/rpc/errors.go

@@ -0,0 +1,102 @@
+package rpc
+
+import (
+	"errors"
+	"fmt"
+
+	"zombiezen.com/go/capnproto2"
+	rpccapnp "zombiezen.com/go/capnproto2/std/capnp/rpc"
+)
+
+// An Exception is a Cap'n Proto RPC error.
+type Exception struct {
+	rpccapnp.Exception
+}
+
+// Error returns the exception's reason.
+func (e Exception) Error() string {
+	r, err := e.Reason()
+	if err != nil {
+		return "rpc exception"
+	}
+	return "rpc exception: " + r
+}
+
+// An Abort is a hang-up by a remote vat.
+type Abort Exception
+
+func copyAbort(m rpccapnp.Message) (Abort, error) {
+	ma, err := m.Abort()
+	if err != nil {
+		return Abort{}, err
+	}
+	msg, _, _ := capnp.NewMessage(capnp.SingleSegment(nil))
+	if err := msg.SetRootPtr(ma.ToPtr()); err != nil {
+		return Abort{}, err
+	}
+	p, err := msg.RootPtr()
+	if err != nil {
+		return Abort{}, err
+	}
+	return Abort{rpccapnp.Exception{Struct: p.Struct()}}, nil
+}
+
+// Error returns the exception's reason.
+func (a Abort) Error() string {
+	r, err := a.Reason()
+	if err != nil {
+		return "rpc: aborted by remote"
+	}
+	return "rpc: aborted by remote: " + r
+}
+
+// toException sets fields on exc to match err.
+func toException(exc rpccapnp.Exception, err error) {
+	if ee, ok := err.(Exception); ok {
+		// TODO(light): copy struct
+		r, err := ee.Reason()
+		if err == nil {
+			exc.SetReason(r)
+		}
+		exc.SetType(ee.Type())
+		return
+	}
+
+	exc.SetReason(err.Error())
+	exc.SetType(rpccapnp.Exception_Type_failed)
+}
+
+// Errors
+var (
+	ErrConnClosed = errors.New("rpc: connection closed")
+)
+
+// Internal errors
+var (
+	errQuestionReused  = errors.New("rpc: question ID reused")
+	errNoMainInterface = errors.New("rpc: no bootstrap interface")
+	errBadTarget       = errors.New("rpc: target not found")
+	errShutdown        = errors.New("rpc: shutdown")
+	errUnimplemented   = errors.New("rpc: remote used unimplemented protocol feature")
+)
+
+type bootstrapError struct {
+	err error
+}
+
+func (e bootstrapError) Error() string {
+	return "rpc bootstrap:" + e.err.Error()
+}
+
+type questionError struct {
+	id     questionID
+	method *capnp.Method // nil if this is bootstrap
+	err    error
+}
+
+func (qe *questionError) Error() string {
+	if qe.method == nil {
+		return fmt.Sprintf("bootstrap call id=%d: %v", qe.id, qe.err)
+	}
+	return fmt.Sprintf("%v call id=%d: %v", qe.method, qe.id, qe.err)
+}