forked from TrueCloudLab/frostfs-api-go
c61656a43f
Define `Message` interface of the generic protobuf message. In the initial implementation, the message should be convertible to and from related gRPC message. Implement encoding functions over the `Message` that can: * unmarshal the `Message` via related gRPC message; * decode the `Message` from JSON format via related gRPC message; * encode the `Message` to JSON. Implement nested `test` package for testing the implementation. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
43 lines
1 KiB
Go
43 lines
1 KiB
Go
package message
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import (
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"fmt"
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"github.com/nspcc-dev/neofs-api-go/rpc/grpc"
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)
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// Message represents raw Protobuf message
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// that can be transmitted via several
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// transport protocols.
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type Message interface {
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// Must return gRPC message that can
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// be used for gRPC protocol transmission.
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ToGRPCMessage() grpc.Message
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// Must restore the message from related
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// gRPC message.
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//
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// If gRPC message is not a related one,
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// ErrUnexpectedMessageType can be returned
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// to indicate this.
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FromGRPCMessage(grpc.Message) error
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}
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// ErrUnexpectedMessageType is an error that
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// is used to indicate message mismatch.
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type ErrUnexpectedMessageType struct {
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exp, act interface{}
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}
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// NewUnexpectedMessageType initializes an error about message mismatch
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// between act and exp.
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func NewUnexpectedMessageType(act, exp interface{}) ErrUnexpectedMessageType {
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return ErrUnexpectedMessageType{
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exp: exp,
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act: act,
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}
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}
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func (e ErrUnexpectedMessageType) Error() string {
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return fmt.Sprintf("unexpected message type %T: expected %T", e.act, e.exp)
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}
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