package lnwire import ( "github.com/go-errors/errors" "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 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(~) return readElements(r, &msg.LocalFeatures, &msg.GlobalFeatures, ) } // 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 { return writeElements(w, msg.LocalFeatures, msg.GlobalFeatures, ) } // 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 }