7ff04d8bad
Removes the MaxPayloadLength function from the Message interface and checks that each message payload is not greater than MaxMsgBody. Since all messages are now allowed to be 65535 bytes in size, the MaxPayloadLength is no longer needed.
118 lines
4.1 KiB
Go
118 lines
4.1 KiB
Go
package lnwire
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import (
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"io"
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)
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// OnionPacketSize is the size of the serialized Sphinx onion packet included
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// in each UpdateAddHTLC message. The breakdown of the onion packet is as
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// follows: 1-byte version, 33-byte ephemeral public key (for ECDH), 1300-bytes
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// of per-hop data, and a 32-byte HMAC over the entire packet.
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const OnionPacketSize = 1366
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// UpdateAddHTLC is the message sent by Alice to Bob when she wishes to add an
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// HTLC to his remote commitment transaction. In addition to information
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// detailing the value, the ID, expiry, and the onion blob is also included
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// which allows Bob to derive the next hop in the route. The HTLC added by this
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// message is to be added to the remote node's "pending" HTLC's. A subsequent
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// CommitSig message will move the pending HTLC to the newly created commitment
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// transaction, marking them as "staged".
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type UpdateAddHTLC struct {
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// ChanID is the particular active channel that this UpdateAddHTLC is
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// bound to.
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ChanID ChannelID
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// ID is the identification server for this HTLC. This value is
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// explicitly included as it allows nodes to survive single-sided
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// restarts. The ID value for this sides starts at zero, and increases
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// with each offered HTLC.
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ID uint64
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// Amount is the amount of millisatoshis this HTLC is worth.
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Amount MilliSatoshi
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// PaymentHash is the payment hash to be included in the HTLC this
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// request creates. The pre-image to this HTLC must be revealed by the
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// upstream peer in order to fully settle the HTLC.
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PaymentHash [32]byte
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// Expiry is the number of blocks after which this HTLC should expire.
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// It is the receiver's duty to ensure that the outgoing HTLC has a
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// sufficient expiry value to allow her to redeem the incoming HTLC.
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Expiry uint32
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// OnionBlob is the raw serialized mix header used to route an HTLC in
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// a privacy-preserving manner. The mix header is defined currently to
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// be parsed as a 4-tuple: (groupElement, routingInfo, headerMAC,
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// body). First the receiving node should use the groupElement, and
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// its current onion key to derive a shared secret with the source.
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// Once the shared secret has been derived, the headerMAC should be
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// checked FIRST. Note that the MAC only covers the routingInfo field.
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// If the MAC matches, and the shared secret is fresh, then the node
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// should strip off a layer of encryption, exposing the next hop to be
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// used in the subsequent UpdateAddHTLC message.
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OnionBlob [OnionPacketSize]byte
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// ExtraData is the set of data that was appended to this message to
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// fill out the full maximum transport message size. These fields can
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// be used to specify optional data such as custom TLV fields.
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ExtraData ExtraOpaqueData
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}
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// NewUpdateAddHTLC returns a new empty UpdateAddHTLC message.
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func NewUpdateAddHTLC() *UpdateAddHTLC {
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return &UpdateAddHTLC{}
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}
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// A compile time check to ensure UpdateAddHTLC implements the lnwire.Message
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// interface.
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var _ Message = (*UpdateAddHTLC)(nil)
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// Decode deserializes a serialized UpdateAddHTLC message stored in the passed
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// io.Reader observing the specified protocol version.
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//
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// This is part of the lnwire.Message interface.
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func (c *UpdateAddHTLC) Decode(r io.Reader, pver uint32) error {
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return ReadElements(r,
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&c.ChanID,
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&c.ID,
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&c.Amount,
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c.PaymentHash[:],
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&c.Expiry,
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c.OnionBlob[:],
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&c.ExtraData,
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)
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}
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// Encode serializes the target UpdateAddHTLC into the passed io.Writer observing
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// the protocol version specified.
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//
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// This is part of the lnwire.Message interface.
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func (c *UpdateAddHTLC) Encode(w io.Writer, pver uint32) error {
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return WriteElements(w,
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c.ChanID,
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c.ID,
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c.Amount,
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c.PaymentHash[:],
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c.Expiry,
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c.OnionBlob[:],
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c.ExtraData,
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)
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}
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// MsgType returns the integer uniquely identifying this message type on the
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// wire.
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//
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// This is part of the lnwire.Message interface.
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func (c *UpdateAddHTLC) MsgType() MessageType {
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return MsgUpdateAddHTLC
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}
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// TargetChanID returns the channel id of the link for which this message is
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// intended.
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//
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// NOTE: Part of peer.LinkUpdater interface.
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func (c *UpdateAddHTLC) TargetChanID() ChannelID {
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return c.ChanID
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}
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