101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
package lnwire
|
|
|
|
import (
|
|
"io"
|
|
"github.com/go-errors/errors"
|
|
)
|
|
|
|
// 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 feature vector which affects HTLCs and thus are
|
|
// also advertised to other nodes.
|
|
GlobalFeatures *FeatureVector
|
|
|
|
// LocalFeatures is feature vector which only affect the protocol
|
|
// between two nodes.
|
|
LocalFeatures *FeatureVector
|
|
}
|
|
|
|
// NewInitMessage creates new instance of init message object.
|
|
func NewInitMessage(gf, lf *FeatureVector) *Init {
|
|
return &Init{
|
|
GlobalFeatures: gf,
|
|
LocalFeatures: lf,
|
|
}
|
|
}
|
|
|
|
// 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 {
|
|
// LocalFeatures(~)
|
|
// GlobalFeatures(~)
|
|
err := readElements(r,
|
|
&msg.LocalFeatures,
|
|
&msg.GlobalFeatures,
|
|
)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// A compile time check to ensure Init implements the lnwire.Message
|
|
// interface.
|
|
var _ Message = (*Init)(nil)
|
|
|
|
// 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 io.Writer, pver uint32) error {
|
|
err := writeElements(w,
|
|
msg.LocalFeatures,
|
|
msg.GlobalFeatures,
|
|
)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Command returns the integer uniquely identifying this message type on the
|
|
// wire.
|
|
//
|
|
// This is part of the lnwire.Message interface.
|
|
func (msg *Init) Command() uint32 {
|
|
return CmdInit
|
|
}
|
|
|
|
// MaxPayloadLength returns the maximum allowed payload size for a Init
|
|
// complete message observing the specified protocol version.
|
|
//
|
|
// This is part of the lnwire.Message interface.
|
|
func (msg *Init) MaxPayloadLength(uint32) uint32 {
|
|
return 2 + maxAllowedSize + 2 + maxAllowedSize
|
|
}
|
|
|
|
// Validate performs any necessary sanity checks to ensure all fields present
|
|
// on the Init are valid.
|
|
//
|
|
// This is part of the lnwire.Message interface.
|
|
func (msg *Init) Validate() error {
|
|
if msg.GlobalFeatures.serializedSize() > maxAllowedSize {
|
|
return errors.Errorf("global feature vector exceed max allowed "+
|
|
"size %v", maxAllowedSize)
|
|
}
|
|
|
|
if msg.LocalFeatures.serializedSize() > maxAllowedSize {
|
|
return errors.Errorf("local feature vector exceed max allowed "+
|
|
"size %v", maxAllowedSize)
|
|
}
|
|
|
|
return nil
|
|
}
|