lightningService.ts•7.59 kB
import * as bitcoin from 'bitcoinjs-lib';
import * as bolt11 from 'bolt11';
import * as bip39 from 'bip39';
import * as bip32 from 'bip32';
import { ECPairFactory } from 'ecpair';
import * as ecc from 'tiny-secp256k1';
import crypto from 'crypto';
import {
LightningInvoice,
Channel,
NodeInfo,
Payment,
PaymentStatus,
ChannelState,
FeeEstimate
} from '../types/lightning.js';
const ECPair = ECPairFactory(ecc);
// Mock Lightning service that simulates LDK functionality
export class LightningService {
private channels: Map<string, Channel> = new Map();
private payments: Map<string, Payment> = new Map();
private nodeInfo: NodeInfo;
private network: bitcoin.Network;
constructor(network: 'mainnet' | 'testnet' | 'regtest' = 'testnet') {
this.network = network === 'mainnet' ? bitcoin.networks.bitcoin :
network === 'testnet' ? bitcoin.networks.testnet :
bitcoin.networks.regtest;
// Validate network was set correctly
if (!this.network) {
this.network = bitcoin.networks.testnet;
}
// Initialize mock node info
this.nodeInfo = {
nodeId: this.generateNodeId(),
alias: 'LDK MCP Node',
numChannels: 0,
numUsableChannels: 0,
numPeers: 0,
blockHeight: 800000,
syncedToChain: true,
version: '0.0.124'
};
}
private generateNodeId(): string {
const keyPair = ECPair.makeRandom({ network: this.network });
return keyPair.publicKey.toString('hex');
}
async generateInvoice(
amountMsat: number,
description?: string,
expiry: number = 3600
): Promise<LightningInvoice> {
const preimage = crypto.randomBytes(32);
const paymentHash = crypto.createHash('sha256').update(preimage).digest();
// Create network object compatible with bolt11
const bolt11Network = {
bech32: this.network.bech32,
pubKeyHash: this.network.pubKeyHash,
scriptHash: this.network.scriptHash,
validWitnessVersions: [0, 1]
};
const invoice: bolt11.PaymentRequestObject = {
network: bolt11Network as any,
timestamp: Math.floor(Date.now() / 1000),
tags: [
{ tagName: 'payment_hash', data: paymentHash.toString('hex') },
{ tagName: 'description', data: description || 'LDK MCP Invoice' },
{ tagName: 'expire_time', data: expiry }
],
millisatoshis: amountMsat.toString()
};
const privateKey = ECPair.makeRandom({ network: this.network }).privateKey!;
const encoded = bolt11.encode(invoice);
const signed = bolt11.sign(encoded, privateKey);
return {
bolt11: signed.paymentRequest || '',
paymentHash: paymentHash.toString('hex'),
amountMsat,
description: description || '',
expiryTime: expiry,
timestamp: invoice.timestamp || 0
};
}
async payInvoice(bolt11Invoice: string): Promise<Payment> {
try {
const decoded = bolt11.decode(bolt11Invoice);
const paymentHash = decoded.tags.find(t => t.tagName === 'payment_hash')?.data as string;
const amountMsat = parseInt(decoded.millisatoshis || '0');
const description = decoded.tags.find(t => t.tagName === 'description')?.data as string;
const payment: Payment = {
paymentHash,
amountMsat,
status: PaymentStatus.Succeeded,
timestamp: Date.now(),
description,
bolt11: bolt11Invoice,
feeMsat: Math.floor(amountMsat * 0.001), // 0.1% fee
paymentPreimage: crypto.randomBytes(32).toString('hex')
};
this.payments.set(paymentHash, payment);
return payment;
} catch (error) {
throw new Error(`Failed to pay invoice: ${error}`);
}
}
async createChannel(
remotePubkey: string,
capacityMsat: number,
pushMsat: number = 0
): Promise<Channel> {
const channelId = crypto.randomBytes(32).toString('hex');
const fundingTxid = crypto.randomBytes(32).toString('hex');
const channel: Channel = {
channelId,
shortChannelId: `800000x${Math.floor(Math.random() * 1000)}x${Math.floor(Math.random() * 10)}`,
remotePubkey,
fundingTxid,
capacityMsat,
localBalanceMsat: capacityMsat - pushMsat,
remoteBalanceMsat: pushMsat,
state: ChannelState.Open,
isUsable: true
};
this.channels.set(channelId, channel);
this.nodeInfo.numChannels++;
this.nodeInfo.numUsableChannels++;
return channel;
}
async closeChannel(channelId: string): Promise<boolean> {
const channel = this.channels.get(channelId);
if (!channel) {
throw new Error('Channel not found');
}
channel.state = ChannelState.Closing;
channel.isUsable = false;
this.nodeInfo.numUsableChannels--;
// Simulate async closing
setTimeout(() => {
channel.state = ChannelState.Closed;
this.channels.delete(channelId);
this.nodeInfo.numChannels--;
}, 5000);
return true;
}
async getChannelStatus(): Promise<Channel[]> {
return Array.from(this.channels.values());
}
async getNodeInfo(): Promise<NodeInfo> {
return this.nodeInfo;
}
async getBalance(): Promise<{ totalMsat: number; spendableMsat: number }> {
let totalMsat = 0;
let spendableMsat = 0;
for (const channel of this.channels.values()) {
if (channel.state === ChannelState.Open) {
totalMsat += channel.localBalanceMsat;
if (channel.isUsable) {
// Reserve 1% for fees
spendableMsat += Math.floor(channel.localBalanceMsat * 0.99);
}
}
}
return { totalMsat, spendableMsat };
}
async decodeInvoice(bolt11Invoice: string): Promise<any> {
try {
const decoded = bolt11.decode(bolt11Invoice);
return {
paymentHash: decoded.tags.find(t => t.tagName === 'payment_hash')?.data,
amountMsat: decoded.millisatoshis ? parseInt(decoded.millisatoshis) : null,
description: decoded.tags.find(t => t.tagName === 'description')?.data,
expiry: decoded.tags.find(t => t.tagName === 'expire_time')?.data,
timestamp: decoded.timestamp,
payee: decoded.payeeNodeKey,
network: decoded.network
};
} catch (error) {
throw new Error(`Failed to decode invoice: ${error}`);
}
}
async listPayments(): Promise<Payment[]> {
return Array.from(this.payments.values()).sort((a, b) => b.timestamp - a.timestamp);
}
async estimateFee(amountMsat: number): Promise<FeeEstimate> {
// Simple fee estimation
const baseFee = 1000; // 1 sat base fee
const proportionalMillionths = 1000; // 0.1%
const estimatedFeeMsat = baseFee + Math.floor(amountMsat * proportionalMillionths / 1000000);
return {
baseFee,
proportionalMillionths,
estimatedFeeMsat,
estimatedDurationSeconds: 60 // 1 minute estimate
};
}
async backupState(): Promise<string> {
const state = {
nodeInfo: this.nodeInfo,
channels: Array.from(this.channels.entries()),
payments: Array.from(this.payments.entries()),
timestamp: Date.now()
};
return Buffer.from(JSON.stringify(state)).toString('base64');
}
async restoreState(backup: string): Promise<boolean> {
try {
const state = JSON.parse(Buffer.from(backup, 'base64').toString());
this.nodeInfo = state.nodeInfo;
this.channels = new Map(state.channels);
this.payments = new Map(state.payments);
return true;
} catch (error) {
throw new Error(`Failed to restore state: ${error}`);
}
}
}