TUN-3015: Add a new cap'n'proto RPC interface for connection registration as well as matching client and server implementations. The old interface extends the new one for backward compatibility.

tunnelrpc/pogs/errors.go

@@ -0,0 +1,53 @@
+package pogs
+
+import (
+	"fmt"
+	"time"
+)
+
+type RetryableError struct {
+	err   error
+	Delay time.Duration
+}
+
+func (re *RetryableError) Error() string {
+	return re.err.Error()
+}
+
+// RetryErrorAfter wraps err to indicate that client should retry after delay
+func RetryErrorAfter(err error, delay time.Duration) *RetryableError {
+	return &RetryableError{
+		err:   err,
+		Delay: delay,
+	}
+}
+
+func (re *RetryableError) Unwrap() error {
+	return re.err
+}
+
+// RPCError is used to indicate errors returned by the RPC subsystem rather
+// than failure of a remote operation
+type RPCError struct {
+	err error
+}
+
+func (re *RPCError) Error() string {
+	return re.err.Error()
+}
+
+func wrapRPCError(err error) *RPCError {
+	return &RPCError{
+		err: err,
+	}
+}
+
+func newRPCError(format string, args ...interface{}) *RPCError {
+	return &RPCError{
+		fmt.Errorf(format, args...),
+	}
+}
+
+func (re *RPCError) Unwrap() error {
+	return re.err
+}