kaspad/app/appmessage

wire

Package wire implements the kaspa wire protocol.

Kaspa Message Overview

The kaspa protocol consists of exchanging messages between peers. Each message is preceded by a header which identifies information about it such as which kaspa network it is a part of, its type, how big it is, and a checksum to verify validity. All encoding and decoding of message headers is handled by this package.

To accomplish this, there is a generic interface for kaspa messages named Message which allows messages of any type to be read, written, or passed around through channels, functions, etc. In addition, concrete implementations of most all kaspa messages are provided. All of the details of marshalling and unmarshalling to and from the wire using kaspa encoding are handled so the caller doesn't have to concern themselves with the specifics.

Reading Messages Example

In order to unmarshal kaspa messages from the wire, use the ReadMessage function. It accepts any io.Reader, but typically this will be a net.Conn to a remote node running a kaspa peer. Example syntax is:

	// Use the most recent protocol version supported by the package and the
	// main kaspa network.
	pver := wire.ProtocolVersion
	kaspanet := wire.Mainnet

	// Reads and validates the next kaspa message from conn using the
	// protocol version pver and the kaspa network kaspanet. The returns
	// are a appmessage.Message, a []byte which contains the unmarshalled
	// raw payload, and a possible error.
	msg, rawPayload, err := wire.ReadMessage(conn, pver, kaspanet)
	if err != nil {
		// Log and handle the error
	}

See the package documentation for details on determining the message type.

Writing Messages Example

In order to marshal kaspa messages to the wire, use the WriteMessage function. It accepts any io.Writer, but typically this will be a net.Conn to a remote node running a kaspa peer. Example syntax to request addresses from a remote peer is:

	// Use the most recent protocol version supported by the package and the
	// main bitcoin network.
	pver := wire.ProtocolVersion
	kaspanet := wire.Mainnet

	// Create a new getaddr kaspa message.
	msg := wire.NewMsgGetAddr()

	// Writes a kaspa message msg to conn using the protocol version
	// pver, and the kaspa network kaspanet. The return is a possible
	// error.
	err := wire.WriteMessage(conn, msg, pver, kaspanet)
	if err != nil {
		// Log and handle the error
	}