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LightningMessageCodecs.scala
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LightningMessageCodecs.scala
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package scoin.ln
import scodec.bits.{BitVector, ByteVector}
import scodec.codecs._
import scodec.{Attempt, Codec}
import scoin._
import scoin.ln._
import scoin.ln.CommonCodecs._
object LightningMessageCodecs {
val featuresCodec: Codec[Features[Feature]] =
varsizebinarydata.xmap[Features[Feature]](
{ bytes => Features(bytes) },
{ features => features.toByteVector }
)
val initFeaturesCodec: Codec[Features[InitFeature]] =
featuresCodec.xmap[Features[InitFeature]](_.initFeatures(), _.unscoped())
/** For historical reasons, features are divided into two feature bitmasks. We
* only send from the second one, but we allow receiving in both.
*/
val combinedFeaturesCodec: Codec[Features[InitFeature]] =
(("globalFeatures" | varsizebinarydata) ::
("localFeatures" | varsizebinarydata))
.as[(ByteVector, ByteVector)]
.xmap[Features[InitFeature]](
{ case (gf, lf) =>
val length = gf.length.max(lf.length)
Features(gf.padLeft(length) | lf.padLeft(length)).initFeatures()
},
{ features => (ByteVector.empty, features.toByteVector) }
)
val initCodec: Codec[Init] =
(("features" | combinedFeaturesCodec) :: ("tlvStream" | InitTlvCodecs.initTlvCodec))
.as[Init]
val errorCodec: Codec[Error] =
(("channelId" | bytes32) ::
("data" | varsizebinarydata) ::
("tlvStream" | ErrorTlv.errorTlvCodec)).as[Error]
val warningCodec: Codec[Warning] =
(("channelId" | bytes32) ::
("data" | varsizebinarydata) ::
("tlvStream" | WarningTlv.warningTlvCodec)).as[Warning]
val pingCodec: Codec[Ping] =
(("pongLength" | uint16) ::
("data" | varsizebinarydata) ::
("tlvStream" | PingTlv.pingTlvCodec)).as[Ping]
val pongCodec: Codec[Pong] =
(("data" | varsizebinarydata) ::
("tlvStream" | PongTlv.pongTlvCodec)).as[Pong]
val channelReestablishCodec: Codec[ChannelReestablish] =
(("channelId" | bytes32) ::
("nextLocalCommitmentNumber" | uint64overflow) ::
("nextRemoteRevocationNumber" | uint64overflow) ::
("yourLastPerCommitmentSecret" | privateKey) ::
("myCurrentPerCommitmentPoint" | publicKey) ::
("tlvStream" | ChannelReestablishTlv.channelReestablishTlvCodec))
.as[ChannelReestablish]
val openChannelCodec: Codec[OpenChannel] =
(("chainHash" | bytes32) ::
("temporaryChannelId" | bytes32) ::
("fundingSatoshis" | satoshi) ::
("pushMsat" | millisatoshi) ::
("dustLimitSatoshis" | satoshi) ::
("maxHtlcValueInFlightMsat" | uint64) ::
("channelReserveSatoshis" | satoshi) ::
("htlcMinimumMsat" | millisatoshi) ::
("feeratePerKw" | feeratePerKw) ::
("toSelfDelay" | cltvExpiryDelta) ::
("maxAcceptedHtlcs" | uint16) ::
("fundingPubkey" | publicKey) ::
("revocationBasepoint" | publicKey) ::
("paymentBasepoint" | publicKey) ::
("delayedPaymentBasepoint" | publicKey) ::
("htlcBasepoint" | publicKey) ::
("firstPerCommitmentPoint" | publicKey) ::
("channelFlags" | (ignore(7) dropLeft bool)
.as[OpenChannel.ChannelFlags]) ::
("tlvStream" | OpenChannelTlv.openTlvCodec)).as[OpenChannel]
val acceptChannelCodec: Codec[AcceptChannel] =
(("temporaryChannelId" | bytes32) ::
("dustLimitSatoshis" | satoshi) ::
("maxHtlcValueInFlightMsat" | uint64) ::
("channelReserveSatoshis" | satoshi) ::
("htlcMinimumMsat" | millisatoshi) ::
("minimumDepth" | uint32) ::
("toSelfDelay" | cltvExpiryDelta) ::
("maxAcceptedHtlcs" | uint16) ::
("fundingPubkey" | publicKey) ::
("revocationBasepoint" | publicKey) ::
("paymentBasepoint" | publicKey) ::
("delayedPaymentBasepoint" | publicKey) ::
("htlcBasepoint" | publicKey) ::
("firstPerCommitmentPoint" | publicKey) ::
("tlvStream" | AcceptChannelTlv.acceptTlvCodec)).as[AcceptChannel]
val fundingCreatedCodec: Codec[FundingCreated] =
(("temporaryChannelId" | bytes32) ::
("fundingTxid" | bytes32) ::
("fundingOutputIndex" | uint16) ::
("signature" | bytes64) ::
("tlvStream" | FundingCreatedTlv.fundingCreatedTlvCodec))
.as[FundingCreated]
val fundingSignedCodec: Codec[FundingSigned] =
(("channelId" | bytes32) ::
("signature" | bytes64) ::
("tlvStream" | FundingSignedTlv.fundingSignedTlvCodec)).as[FundingSigned]
val fundingLockedCodec: Codec[FundingLocked] =
(("channelId" | bytes32) ::
("nextPerCommitmentPoint" | publicKey) ::
("tlvStream" | FundingLockedTlv.fundingLockedTlvCodec)).as[FundingLocked]
val shutdownCodec: Codec[Shutdown] =
(("channelId" | bytes32) ::
("scriptPubKey" | varsizebinarydata) ::
("tlvStream" | ShutdownTlv.shutdownTlvCodec)).as[Shutdown]
val closingSignedCodec: Codec[ClosingSigned] =
(("channelId" | bytes32) ::
("feeSatoshis" | satoshi) ::
("signature" | bytes64) ::
("tlvStream" | ClosingSignedTlv.closingSignedTlvCodec)).as[ClosingSigned]
val updateAddHtlcCodec: Codec[UpdateAddHtlc] =
(("channelId" | bytes32) ::
("id" | uint64overflow) ::
("amountMsat" | millisatoshi) ::
("paymentHash" | bytes32) ::
("expiry" | cltvExpiry) ::
("onionRoutingPacket" | PaymentOnionCodecs.paymentOnionPacketCodec) ::
("tlvStream" | UpdateAddHtlcTlv.addHtlcTlvCodec)).as[UpdateAddHtlc]
val updateFulfillHtlcCodec: Codec[UpdateFulfillHtlc] =
(("channelId" | bytes32) ::
("id" | uint64overflow) ::
("paymentPreimage" | bytes32) ::
("tlvStream" | UpdateFulfillHtlcTlv.updateFulfillHtlcTlvCodec))
.as[UpdateFulfillHtlc]
val updateFailHtlcCodec: Codec[UpdateFailHtlc] =
(("channelId" | bytes32) ::
("id" | uint64overflow) ::
("reason" | varsizebinarydata) ::
("tlvStream" | UpdateFailHtlcTlv.updateFailHtlcTlvCodec))
.as[UpdateFailHtlc]
val updateFailMalformedHtlcCodec: Codec[UpdateFailMalformedHtlc] =
(("channelId" | bytes32) ::
("id" | uint64overflow) ::
("onionHash" | bytes32) ::
("failureCode" | uint16) ::
("tlvStream" | UpdateFailMalformedHtlcTlv.updateFailMalformedHtlcTlvCodec))
.as[UpdateFailMalformedHtlc]
val commitSigCodec: Codec[CommitSig] =
(("channelId" | bytes32) ::
("signature" | bytes64) ::
("htlcSignatures" | listofsignatures) ::
("tlvStream" | CommitSigTlv.commitSigTlvCodec)).as[CommitSig]
val revokeAndAckCodec: Codec[RevokeAndAck] =
(("channelId" | bytes32) ::
("perCommitmentSecret" | privateKey) ::
("nextPerCommitmentPoint" | publicKey) ::
("tlvStream" | RevokeAndAckTlv.revokeAndAckTlvCodec)).as[RevokeAndAck]
val updateFeeCodec: Codec[UpdateFee] =
(("channelId" | bytes32) ::
("feeratePerKw" | feeratePerKw) ::
("tlvStream" | UpdateFeeTlv.updateFeeTlvCodec)).as[UpdateFee]
val announcementSignaturesCodec: Codec[AnnouncementSignatures] =
(("channelId" | bytes32) ::
("shortChannelId" | shortchannelid) ::
("nodeSignature" | bytes64) ::
("bitcoinSignature" | bytes64) ::
("tlvStream" | AnnouncementSignaturesTlv.announcementSignaturesTlvCodec))
.as[AnnouncementSignatures]
val channelAnnouncementWitnessCodec =
("features" | featuresCodec) ::
("chainHash" | bytes32) ::
("shortChannelId" | shortchannelid) ::
("nodeId1" | publicKey) ::
("nodeId2" | publicKey) ::
("bitcoinKey1" | publicKey) ::
("bitcoinKey2" | publicKey) ::
("tlvStream" | ChannelAnnouncementTlv.channelAnnouncementTlvCodec)
val channelAnnouncementCodec: Codec[ChannelAnnouncement] =
(("nodeSignature1" | bytes64) ::
("nodeSignature2" | bytes64) ::
("bitcoinSignature1" | bytes64) ::
("bitcoinSignature2" | bytes64) ::
channelAnnouncementWitnessCodec).as[ChannelAnnouncement]
val nodeAnnouncementWitnessCodec =
("features" | featuresCodec) ::
("timestamp" | timestampSecond) ::
("nodeId" | publicKey) ::
("rgbColor" | rgb) ::
("alias" | zeropaddedstring(32)) ::
("addresses" | listofnodeaddresses) ::
("tlvStream" | NodeAnnouncementTlv.nodeAnnouncementTlvCodec)
val nodeAnnouncementCodec: Codec[NodeAnnouncement] =
(("signature" | bytes64) ::
nodeAnnouncementWitnessCodec).as[NodeAnnouncement]
case class MessageFlags(optionChannelHtlcMax: Boolean)
val messageFlagsCodec =
("messageFlags" | (ignore(7) :: bool)).as[MessageFlags]
val reverseBool: Codec[Boolean] = bool.xmap[Boolean](b => !b, b => !b)
/** BOLT 7 defines a 'disable' bit and a 'direction' bit, but it's easier to
* understand if we take the reverse.
*/
val channelFlagsCodec =
("channelFlags" | (ignore(6) :: reverseBool :: reverseBool))
.as[ChannelUpdate.ChannelFlags]
val channelUpdateChecksumCodec =
("chainHash" | bytes32) ::
("shortChannelId" | shortchannelid) ::
("messageFlags" | constant(1)).dropLeft(
channelFlagsCodec ::
("cltvExpiryDelta" | cltvExpiryDelta) ::
("htlcMinimumMsat" | millisatoshi) ::
("feeBaseMsat" | millisatoshi32) ::
("feeProportionalMillionths" | uint32) ::
("htlcMaximumMsat" | millisatoshi)
)
val channelUpdateWitnessCodec =
("chainHash" | bytes32) ::
("shortChannelId" | shortchannelid) ::
("timestamp" | timestampSecond) ::
("messageFlags" | constant(1)).dropLeft(
channelFlagsCodec ::
("cltvExpiryDelta" | cltvExpiryDelta) ::
("htlcMinimumMsat" | millisatoshi) ::
("feeBaseMsat" | millisatoshi32) ::
("feeProportionalMillionths" | uint32) ::
("htlcMaximumMsat" | millisatoshi) ::
("tlvStream" | ChannelUpdateTlv.channelUpdateTlvCodec)
)
val channelUpdateCodec: Codec[ChannelUpdate] =
(("signature" | bytes64) ::
channelUpdateWitnessCodec).as[ChannelUpdate]
val encodedShortChannelIdsCodec: Codec[EncodedShortChannelIds] =
discriminated[EncodedShortChannelIds]
.by(byte)
.subcaseP(0) {
case a @ EncodedShortChannelIds(_, Nil) =>
a // empty list is always encoded with encoding type 'uncompressed' for compatibility with other implementations
case a @ EncodedShortChannelIds(EncodingType.UNCOMPRESSED, _) => a
}(
(provide[EncodingType](EncodingType.UNCOMPRESSED) :: list(
shortchannelid
)).as[EncodedShortChannelIds]
)
val queryShortChannelIdsCodec: Codec[QueryShortChannelIds] =
(("chainHash" | bytes32) ::
("shortChannelIds" | variableSizeBytes(
uint16,
encodedShortChannelIdsCodec
)) ::
("tlvStream" | QueryShortChannelIdsTlv.codec)).as[QueryShortChannelIds]
val replyShortChanelIdsEndCodec: Codec[ReplyShortChannelIdsEnd] =
(("chainHash" | bytes32) ::
("complete" | byte) ::
("tlvStream" | ReplyShortChannelIdsEndTlv.replyShortChannelIdsEndTlvCodec))
.as[ReplyShortChannelIdsEnd]
val queryChannelRangeCodec: Codec[QueryChannelRange] =
(("chainHash" | bytes32) ::
("firstBlock" | blockHeight) ::
("numberOfBlocks" | uint32) ::
("tlvStream" | QueryChannelRangeTlv.codec)).as[QueryChannelRange]
val replyChannelRangeCodec: Codec[ReplyChannelRange] =
(("chainHash" | bytes32) ::
("firstBlock" | blockHeight) ::
("numberOfBlocks" | uint32) ::
("complete" | byte) ::
("shortChannelIds" | variableSizeBytes(
uint16,
encodedShortChannelIdsCodec
)) ::
("tlvStream" | ReplyChannelRangeTlv.codec)).as[ReplyChannelRange]
val gossipTimestampFilterCodec: Codec[GossipTimestampFilter] =
(("chainHash" | bytes32) ::
("firstTimestamp" | timestampSecond) ::
("timestampRange" | uint32) ::
("tlvStream" | GossipTimestampFilterTlv.gossipTimestampFilterTlvCodec))
.as[GossipTimestampFilter]
val unknownMessageCodec: Codec[UnknownMessage] = (
("tag" | uint16) ::
("message" | varsizebinarydata)
).as[UnknownMessage]
val lightningMessageCodec = discriminated[LightningMessage]
.by(uint16)
.typecase(1, warningCodec)
.typecase(16, initCodec)
.typecase(17, errorCodec)
.typecase(18, pingCodec)
.typecase(19, pongCodec)
.typecase(32, openChannelCodec)
.typecase(33, acceptChannelCodec)
.typecase(34, fundingCreatedCodec)
.typecase(35, fundingSignedCodec)
.typecase(36, fundingLockedCodec)
.typecase(38, shutdownCodec)
.typecase(39, closingSignedCodec)
.typecase(128, updateAddHtlcCodec)
.typecase(130, updateFulfillHtlcCodec)
.typecase(131, updateFailHtlcCodec)
.typecase(132, commitSigCodec)
.typecase(133, revokeAndAckCodec)
.typecase(134, updateFeeCodec)
.typecase(135, updateFailMalformedHtlcCodec)
.typecase(136, channelReestablishCodec)
.typecase(256, channelAnnouncementCodec)
.typecase(257, nodeAnnouncementCodec)
.typecase(258, channelUpdateCodec)
.typecase(259, announcementSignaturesCodec)
.typecase(261, queryShortChannelIdsCodec)
.typecase(262, replyShortChanelIdsEndCodec)
.typecase(263, queryChannelRangeCodec)
.typecase(264, replyChannelRangeCodec)
.typecase(265, gossipTimestampFilterCodec)
val lightningMessageCodecWithFallback: Codec[LightningMessage] =
discriminatorWithDefault(lightningMessageCodec, unknownMessageCodec.upcast)
}