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77abea9c1e
Convert all networkdb core message types from go message types to protobuf message types. This faciliates future modification of the message structure without breaking backward compatibility. Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
102 lines
2.1 KiB
Go
102 lines
2.1 KiB
Go
package networkdb
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import "github.com/gogo/protobuf/proto"
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const (
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// Max udp message size chosen to avoid network packet
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// fragmentation.
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udpSendBuf = 1400
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// Compound message header overhead 1 byte(message type) + 4
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// bytes (num messages)
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compoundHeaderOverhead = 5
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// Overhead for each embedded message in a compound message 4
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// bytes (len of embedded message)
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compoundOverhead = 4
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)
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func encodeRawMessage(t MessageType, raw []byte) ([]byte, error) {
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gMsg := GossipMessage{
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Type: t,
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Data: raw,
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}
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buf, err := proto.Marshal(&gMsg)
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if err != nil {
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return nil, err
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}
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return buf, nil
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}
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func encodeMessage(t MessageType, msg interface{}) ([]byte, error) {
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buf, err := proto.Marshal(msg.(proto.Message))
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if err != nil {
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return nil, err
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}
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buf, err = encodeRawMessage(t, buf)
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if err != nil {
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return nil, err
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}
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return buf, nil
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}
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func decodeMessage(buf []byte) (MessageType, []byte, error) {
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var gMsg GossipMessage
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err := proto.Unmarshal(buf, &gMsg)
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if err != nil {
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return MessageTypeInvalid, nil, err
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}
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return gMsg.Type, gMsg.Data, nil
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}
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// makeCompoundMessage takes a list of messages and generates
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// a single compound message containing all of them
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func makeCompoundMessage(msgs [][]byte) []byte {
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cMsg := CompoundMessage{}
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cMsg.Messages = make([]*CompoundMessage_SimpleMessage, 0, len(msgs))
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for _, m := range msgs {
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cMsg.Messages = append(cMsg.Messages, &CompoundMessage_SimpleMessage{
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Payload: m,
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})
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}
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buf, err := proto.Marshal(&cMsg)
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if err != nil {
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return nil
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}
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gMsg := GossipMessage{
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Type: MessageTypeCompound,
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Data: buf,
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}
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buf, err = proto.Marshal(&gMsg)
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if err != nil {
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return nil
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}
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return buf
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}
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// decodeCompoundMessage splits a compound message and returns
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// the slices of individual messages. Returns any potential error.
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func decodeCompoundMessage(buf []byte) ([][]byte, error) {
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var cMsg CompoundMessage
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if err := proto.Unmarshal(buf, &cMsg); err != nil {
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return nil, err
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}
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parts := make([][]byte, 0, len(cMsg.Messages))
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for _, m := range cMsg.Messages {
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parts = append(parts, m.Payload)
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}
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return parts, nil
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}
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