forked from wakiyamap/lnd
/
init_message.go
80 lines (69 loc) · 2.38 KB
/
init_message.go
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package lnwire
import (
"bytes"
"io"
)
// Init is the first message reveals the features supported or required by this
// node. Nodes wait for receipt of the other's features to simplify error
// diagnosis where features are incompatible. Each node MUST wait to receive
// init before sending any other messages.
type Init struct {
// GlobalFeatures is a legacy feature vector used for backwards
// compatibility with older nodes. Any features defined here should be
// merged with those presented in Features.
GlobalFeatures *RawFeatureVector
// Features is a feature vector containing the features supported by
// the remote node.
//
// NOTE: Older nodes may place some features in GlobalFeatures, but all
// new features are to be added in Features. When handling an Init
// message, any GlobalFeatures should be merged into the unified
// Features field.
Features *RawFeatureVector
// ExtraData is the set of data that was appended to this message to
// fill out the full maximum transport message size. These fields can
// be used to specify optional data such as custom TLV fields.
ExtraData ExtraOpaqueData
}
// NewInitMessage creates new instance of init message object.
func NewInitMessage(gf *RawFeatureVector, f *RawFeatureVector) *Init {
return &Init{
GlobalFeatures: gf,
Features: f,
ExtraData: make([]byte, 0),
}
}
// A compile time check to ensure Init implements the lnwire.Message
// interface.
var _ Message = (*Init)(nil)
// Decode deserializes a serialized Init message stored in the passed
// io.Reader observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (msg *Init) Decode(r io.Reader, pver uint32) error {
return ReadElements(r,
&msg.GlobalFeatures,
&msg.Features,
&msg.ExtraData,
)
}
// Encode serializes the target Init into the passed io.Writer observing
// the protocol version specified.
//
// This is part of the lnwire.Message interface.
func (msg *Init) Encode(w *bytes.Buffer, pver uint32) error {
if err := WriteRawFeatureVector(w, msg.GlobalFeatures); err != nil {
return err
}
if err := WriteRawFeatureVector(w, msg.Features); err != nil {
return err
}
return WriteBytes(w, msg.ExtraData)
}
// MsgType returns the integer uniquely identifying this message type on the
// wire.
//
// This is part of the lnwire.Message interface.
func (msg *Init) MsgType() MessageType {
return MsgInit
}