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detect channels opened from change outputs

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Mononaut 2022-11-20 19:11:14 +09:00 committed by softsimon
parent 0c96a11150
commit 8f0830f6d1
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GPG Key ID: 488D7DCFB5A430D7
2 changed files with 105 additions and 75 deletions
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26
backend/src/api/explorer/channels.api.ts
View File

@ -277,7 +277,7 @@ class ChannelsApi {
}
}
public async $getChannelForensicsByTransactionId(transactionId: string): Promise<any> {
public async $getChannelForensicsByClosingId(transactionId: string): Promise<any> {
try {
const query = `
SELECT
@ -294,7 +294,29 @@ class ChannelsApi {
return rows[0];
}
} catch (e) {
logger.err('$getChannelForensicsByTransactionId error: ' + (e instanceof Error ? e.message : e));
logger.err('$getChannelForensicsByClosingId error: ' + (e instanceof Error ? e.message : e));
// don't throw - this data isn't essential
}
}
public async $getChannelForensicsByOpeningId(transactionId: string): Promise<any> {
try {
const query = `
SELECT
channels.id, channels.node1_public_key, channels.node2_public_key,
channels.status, channels.transaction_id,
forensics.*
FROM channels
LEFT JOIN channels_forensics as forensics ON forensics.channel_id = channels.id
WHERE channels.transaction_id = ?
`;
const [rows]: any = await DB.query(query, [transactionId]);
if (rows.length > 0) {
rows[0].outputs = JSON.parse(rows[0].outputs);
return rows[0];
}
} catch (e) {
logger.err('$getChannelForensicsByOpeningId error: ' + (e instanceof Error ? e.message : e));
// don't throw - this data isn't essential
}
}

72
backend/src/tasks/lightning/network-sync.service.ts
View File

@ -306,7 +306,7 @@ class NetworkSyncService {
}
private findLightningScript(vin: IEsploraApi.Vin): number {
const topElement = vin.witness[vin.witness.length - 2];
const topElement = vin.witness ? vin.witness[vin.witness.length - 2] : '';
if (/^OP_IF OP_PUSHBYTES_33 \w{66} OP_ELSE OP_PUSH(NUM_\d+|BYTES_(1 \w{2}|2 \w{4})) OP_CSV OP_DROP OP_PUSHBYTES_33 \w{66} OP_ENDIF OP_CHECKSIG$/.test(vin.inner_witnessscript_asm)) {
// https://github.com/lightning/bolts/blob/master/03-transactions.md#commitment-transaction-outputs
if (topElement === '01') {
@ -325,7 +325,7 @@ class NetworkSyncService {
) {
// https://github.com/lightning/bolts/blob/master/03-transactions.md#offered-htlc-outputs
// https://github.com/lightning/bolts/blob/master/03-transactions.md#received-htlc-outputs
if (topElement.length === 66) {
if (topElement?.length === 66) {
// top element is a public key
// 'Revoked Lightning HTLC'; Penalty force closed
return 4;
@ -365,28 +365,35 @@ class NetworkSyncService {
for (const openChannel of channels) {
const openTx = await bitcoinApi.$getRawTransaction(openChannel.transaction_id);
for (const input of openTx.vin) {
const closeChannel = await channelsApi.$getChannelForensicsByTransactionId(input.txid);
const closeChannel = await channelsApi.$getChannelForensicsByClosingId(input.txid);
if (closeChannel) {
// this input directly spends a channel close output
await this.$attributeChannelBalances(closeChannel, openChannel, input);
} else {
const prevOpenChannel = await channelsApi.$getChannelForensicsByOpeningId(input.txid);
if (prevOpenChannel) {
await this.$attributeChannelBalances(prevOpenChannel, openChannel, input, null, null, true);
} else {
// check if this input spends any swept channel close outputs
await this.$attributeSweptChannelCloses(openChannel, input);
}
}
}
// calculate how much of the total input value is attributable to the channel open output
openChannel.funding_ratio = openTx.vout[openChannel.transaction_vout].value / ((openTx.vout.reduce((sum, v) => sum + v.value, 0) || 1) + openTx.fee);
// save changes to the opening channel, and mark it as checked
if (openTx.vin.length === 1) {
if (openTx?.vin?.length === 1) {
openChannel.single_funded = true;
}
if (openChannel.node1_funding_balance || openChannel.node2_funding_balance || openChannel.node1_closing_balance || openChannel.node2_closing_balance || openChannel.closed_by) {
await channelsApi.$updateOpeningInfo(openChannel);
}
await channelsApi.$markChannelSourceChecked(openChannel.id);
++progress;
const elapsedSeconds = Math.round((new Date().getTime() / 1000) - this.loggerTimer);
if (elapsedSeconds > 10) {
logger.info(`Updating channel opened channel forensics ${progress}/${channels.length}`);
logger.info(`Updating opened channel forensics ${progress}/${channels?.length}`);
this.loggerTimer = new Date().getTime() / 1000;
}
}
@ -408,7 +415,7 @@ class NetworkSyncService {
for (const sweepInput of sweepTx.vin) {
const lnScriptType = this.findLightningScript(sweepInput);
if (lnScriptType > 1) {
const closeChannel = await channelsApi.$getChannelForensicsByTransactionId(sweepInput.txid);
const closeChannel = await channelsApi.$getChannelForensicsByClosingId(sweepInput.txid);
if (closeChannel) {
const initiator = (lnScriptType === 2 || lnScriptType === 4) ? 'remote' : (lnScriptType === 3 ? 'local' : null);
await this.$attributeChannelBalances(closeChannel, openChannel, sweepInput, openContribution, initiator);
@ -418,8 +425,8 @@ class NetworkSyncService {
}
private async $attributeChannelBalances(
closeChannel, openChannel, input: IEsploraApi.Vin, openContribution: number | null = null,
initiator: 'remote' | 'local' | null = null
prevChannel, openChannel, input: IEsploraApi.Vin, openContribution: number | null = null,
initiator: 'remote' | 'local' | null = null, linkedOpenings: boolean = false
): Promise<void> {
// figure out which node controls the input/output
let openSide;
@ -427,18 +434,18 @@ class NetworkSyncService {
let closeRemote;
let matched = false;
let ambiguous = false; // if counterparties are the same in both channels, we can't tell them apart
if (openChannel.node1_public_key === closeChannel.node1_public_key) {
if (openChannel.node1_public_key === prevChannel.node1_public_key) {
openSide = 1;
closeLocal = 1;
closeRemote = 2;
matched = true;
} else if (openChannel.node1_public_key === closeChannel.node2_public_key) {
} else if (openChannel.node1_public_key === prevChannel.node2_public_key) {
openSide = 1;
closeLocal = 2;
closeRemote = 1;
matched = true;
}
if (openChannel.node2_public_key === closeChannel.node1_public_key) {
if (openChannel.node2_public_key === prevChannel.node1_public_key) {
openSide = 2;
closeLocal = 1;
closeRemote = 2;
@ -446,7 +453,7 @@ class NetworkSyncService {
ambiguous = true;
}
matched = true;
} else if (openChannel.node2_public_key === closeChannel.node2_public_key) {
} else if (openChannel.node2_public_key === prevChannel.node2_public_key) {
openSide = 2;
closeLocal = 2;
closeRemote = 1;
@ -458,28 +465,29 @@ class NetworkSyncService {
if (matched && !ambiguous) {
// fetch closing channel transaction and perform forensics on the outputs
let closingTx: IEsploraApi.Transaction | undefined;
let prevChannelTx: IEsploraApi.Transaction | undefined;
let outspends: IEsploraApi.Outspend[] | undefined;
try {
closingTx = await bitcoinApi.$getRawTransaction(input.txid);
prevChannelTx = await bitcoinApi.$getRawTransaction(input.txid);
outspends = await bitcoinApi.$getOutspends(input.txid);
} catch (e) {
logger.err(`Failed to call ${config.ESPLORA.REST_API_URL + '/tx/' + closeChannel.closing_transaction_id + '/outspends'}. Reason ${e instanceof Error ? e.message : e}`);
logger.err(`Failed to call ${config.ESPLORA.REST_API_URL + '/tx/' + input.txid + '/outspends'}. Reason ${e instanceof Error ? e.message : e}`);
}
if (!outspends || !closingTx) {
if (!outspends || !prevChannelTx) {
return;
}
if (!closeChannel.outputs) {
closeChannel.outputs = closeChannel.outputs || closingTx.vout.map(vout => {
if (!linkedOpenings) {
if (!prevChannel.outputs) {
prevChannel.outputs = prevChannel.outputs || prevChannelTx.vout.map(vout => {
return {
type: 0,
value: vout.value,
};
});
}
for (let i = 0; i < outspends.length; i++) {
for (let i = 0; i < outspends?.length; i++) {
const outspend = outspends[i];
const output = closeChannel.outputs[i];
const output = prevChannel.outputs[i];
if (outspend.spent && outspend.txid) {
try {
const spendingTx = await bitcoinApi.$getRawTransaction(outspend.txid);
@ -495,12 +503,12 @@ class NetworkSyncService {
}
// attribute outputs to each counterparty, and sum up total known balances
closeChannel.outputs[input.vout].node = closeLocal;
const isPenalty = closeChannel.outputs.filter((out) => out.type === 2 || out.type === 4).length > 0;
const normalOutput = [1,3].includes(closeChannel.outputs[input.vout].type);
prevChannel.outputs[input.vout].node = closeLocal;
const isPenalty = prevChannel.outputs.filter((out) => out.type === 2 || out.type === 4)?.length > 0;
const normalOutput = [1,3].includes(prevChannel.outputs[input.vout].type);
let localClosingBalance = 0;
let remoteClosingBalance = 0;
for (const output of closeChannel.outputs) {
for (const output of prevChannel.outputs) {
if (isPenalty) {
// penalty close, so local node takes everything
localClosingBalance += output.value;
@ -516,19 +524,19 @@ class NetworkSyncService {
remoteClosingBalance += output.value;
}
}
prevChannel[`node${closeLocal}_closing_balance`] = localClosingBalance;
prevChannel[`node${closeRemote}_closing_balance`] = remoteClosingBalance;
prevChannel.closing_fee = prevChannelTx.fee;
openChannel[`node${openSide}_funding_balance`] = openChannel[`node${openSide}_funding_balance`] + (openContribution || closingTx?.vout[input.vout]?.value || 0);
closeChannel[`node${closeLocal}_closing_balance`] = localClosingBalance;
closeChannel[`node${closeRemote}_closing_balance`] = remoteClosingBalance;
closeChannel.closing_fee = closingTx.fee;
if (initiator) {
if (initiator && !linkedOpenings) {
const initiatorSide = initiator === 'remote' ? closeRemote : closeLocal;
closeChannel.closed_by = closeChannel[`node${initiatorSide}_public_key`];
prevChannel.closed_by = prevChannel[`node${initiatorSide}_public_key`];
}
// save changes to the closing channel
await channelsApi.$updateClosingInfo(closeChannel);
await channelsApi.$updateClosingInfo(prevChannel);
}
openChannel[`node${openSide}_funding_balance`] = openChannel[`node${openSide}_funding_balance`] + (openContribution || prevChannelTx?.vout[input.vout]?.value || 0);
}
}
}