384 lines
12 KiB
TypeScript
384 lines
12 KiB
TypeScript
import * as bitcoinjs from 'bitcoinjs-lib';
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import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
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import { IBitcoinApi } from './bitcoin-api.interface';
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import { IEsploraApi } from './esplora-api.interface';
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import blocks from '../blocks';
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import mempool from '../mempool';
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import { TransactionExtended } from '../../mempool.interfaces';
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class BitcoinApi implements AbstractBitcoinApi {
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private rawMempoolCache: IBitcoinApi.RawMempool | null = null;
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protected bitcoindClient: any;
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constructor(bitcoinClient: any) {
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this.bitcoindClient = bitcoinClient;
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}
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static convertBlock(block: IBitcoinApi.Block): IEsploraApi.Block {
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return {
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id: block.hash,
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height: block.height,
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version: block.version,
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timestamp: block.time,
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bits: parseInt(block.bits, 16),
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nonce: block.nonce,
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difficulty: block.difficulty,
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merkle_root: block.merkleroot,
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tx_count: block.nTx,
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size: block.size,
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weight: block.weight,
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previousblockhash: block.previousblockhash,
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};
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}
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$getRawTransaction(txId: string, skipConversion = false, addPrevout = false): Promise<IEsploraApi.Transaction> {
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// If the transaction is in the mempool we already converted and fetched the fee. Only prevouts are missing
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const txInMempool = mempool.getMempool()[txId];
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if (txInMempool && addPrevout) {
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return this.$addPrevouts(txInMempool);
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}
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return this.bitcoindClient.getRawTransaction(txId, true)
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.then((transaction: IBitcoinApi.Transaction) => {
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if (skipConversion) {
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transaction.vout.forEach((vout) => {
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vout.value = Math.round(vout.value * 100000000);
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});
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return transaction;
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}
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return this.$convertTransaction(transaction, addPrevout);
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})
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.catch((e: Error) => {
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if (e.message.startsWith('The genesis block coinbase')) {
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return this.$returnCoinbaseTransaction();
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}
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throw e;
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});
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}
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$getBlockHeightTip(): Promise<number> {
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return this.bitcoindClient.getChainTips()
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.then((result: IBitcoinApi.ChainTips[]) => {
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return result.find(tip => tip.status === 'active')!.height;
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});
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}
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$getTxIdsForBlock(hash: string): Promise<string[]> {
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return this.bitcoindClient.getBlock(hash, 1)
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.then((rpcBlock: IBitcoinApi.Block) => rpcBlock.tx);
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}
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$getRawBlock(hash: string): Promise<string> {
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return this.bitcoindClient.getBlock(hash, 0);
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}
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$getBlockHash(height: number): Promise<string> {
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return this.bitcoindClient.getBlockHash(height);
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}
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$getBlockHeader(hash: string): Promise<string> {
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return this.bitcoindClient.getBlockHeader(hash, false);
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}
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async $getBlock(hash: string): Promise<IEsploraApi.Block> {
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const foundBlock = blocks.getBlocks().find((block) => block.id === hash);
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if (foundBlock) {
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return foundBlock;
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}
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return this.bitcoindClient.getBlock(hash)
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.then((block: IBitcoinApi.Block) => BitcoinApi.convertBlock(block));
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}
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$getAddress(address: string): Promise<IEsploraApi.Address> {
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throw new Error('Method getAddress not supported by the Bitcoin RPC API.');
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}
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$getAddressTransactions(address: string, lastSeenTxId: string): Promise<IEsploraApi.Transaction[]> {
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throw new Error('Method getAddressTransactions not supported by the Bitcoin RPC API.');
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}
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$getRawMempool(): Promise<IEsploraApi.Transaction['txid'][]> {
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return this.bitcoindClient.getRawMemPool();
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}
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$getAddressPrefix(prefix: string): string[] {
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const found: { [address: string]: string } = {};
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const mp = mempool.getMempool();
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for (const tx in mp) {
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for (const vout of mp[tx].vout) {
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if (vout.scriptpubkey_address.indexOf(prefix) === 0) {
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found[vout.scriptpubkey_address] = '';
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if (Object.keys(found).length >= 10) {
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return Object.keys(found);
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}
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}
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}
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}
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return Object.keys(found);
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}
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$sendRawTransaction(rawTransaction: string): Promise<string> {
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return this.bitcoindClient.sendRawTransaction(rawTransaction);
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}
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async $getOutspends(txId: string): Promise<IEsploraApi.Outspend[]> {
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const outSpends: IEsploraApi.Outspend[] = [];
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const tx = await this.$getRawTransaction(txId, true, false);
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for (let i = 0; i < tx.vout.length; i++) {
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if (tx.status && tx.status.block_height == 0) {
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outSpends.push({
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spent: false
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});
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} else {
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const txOut = await this.bitcoindClient.getTxOut(txId, i);
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outSpends.push({
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spent: txOut === null,
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});
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}
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}
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return outSpends;
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}
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$getEstimatedHashrate(blockHeight: number): Promise<number> {
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// 120 is the default block span in Core
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return this.bitcoindClient.getNetworkHashPs(120, blockHeight);
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}
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protected async $convertTransaction(transaction: IBitcoinApi.Transaction, addPrevout: boolean): Promise<IEsploraApi.Transaction> {
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let esploraTransaction: IEsploraApi.Transaction = {
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txid: transaction.txid,
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version: transaction.version,
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locktime: transaction.locktime,
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size: transaction.size,
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weight: transaction.weight,
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fee: 0,
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vin: [],
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vout: [],
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status: { confirmed: false },
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};
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esploraTransaction.vout = transaction.vout.map((vout) => {
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return {
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value: Math.round(vout.value * 100000000),
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scriptpubkey: vout.scriptPubKey.hex,
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scriptpubkey_address: vout.scriptPubKey && vout.scriptPubKey.address ? vout.scriptPubKey.address
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: vout.scriptPubKey.addresses ? vout.scriptPubKey.addresses[0] : '',
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scriptpubkey_asm: vout.scriptPubKey.asm ? this.convertScriptSigAsm(vout.scriptPubKey.hex) : '',
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scriptpubkey_type: this.translateScriptPubKeyType(vout.scriptPubKey.type),
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};
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});
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esploraTransaction.vin = transaction.vin.map((vin) => {
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return {
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is_coinbase: !!vin.coinbase,
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prevout: null,
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scriptsig: vin.scriptSig && vin.scriptSig.hex || vin.coinbase || '',
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scriptsig_asm: vin.scriptSig && this.convertScriptSigAsm(vin.scriptSig.hex) || '',
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sequence: vin.sequence,
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txid: vin.txid || '',
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vout: vin.vout || 0,
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witness: vin.txinwitness,
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};
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});
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if (transaction.confirmations) {
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esploraTransaction.status = {
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confirmed: true,
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block_height: blocks.getCurrentBlockHeight() - transaction.confirmations + 1,
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block_hash: transaction.blockhash,
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block_time: transaction.blocktime,
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};
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}
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if (addPrevout) {
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if (transaction.confirmations) {
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esploraTransaction = await this.$calculateFeeFromInputs(esploraTransaction);
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} else {
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esploraTransaction = await this.$appendMempoolFeeData(esploraTransaction);
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esploraTransaction = await this.$calculateFeeFromInputs(esploraTransaction);
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}
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}
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return esploraTransaction;
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}
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private translateScriptPubKeyType(outputType: string): string {
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const map = {
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'pubkey': 'p2pk',
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'pubkeyhash': 'p2pkh',
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'scripthash': 'p2sh',
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'witness_v0_keyhash': 'v0_p2wpkh',
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'witness_v0_scripthash': 'v0_p2wsh',
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'witness_v1_taproot': 'v1_p2tr',
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'nonstandard': 'nonstandard',
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'multisig': 'multisig',
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'nulldata': 'op_return'
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};
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if (map[outputType]) {
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return map[outputType];
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} else {
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return 'unknown';
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}
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}
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private async $appendMempoolFeeData(transaction: IEsploraApi.Transaction): Promise<IEsploraApi.Transaction> {
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if (transaction.fee) {
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return transaction;
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}
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let mempoolEntry: IBitcoinApi.MempoolEntry;
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if (!mempool.isInSync() && !this.rawMempoolCache) {
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this.rawMempoolCache = await this.$getRawMempoolVerbose();
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}
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if (this.rawMempoolCache && this.rawMempoolCache[transaction.txid]) {
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mempoolEntry = this.rawMempoolCache[transaction.txid];
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} else {
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mempoolEntry = await this.$getMempoolEntry(transaction.txid);
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}
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transaction.fee = Math.round(mempoolEntry.fees.base * 100000000);
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return transaction;
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}
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protected async $addPrevouts(transaction: TransactionExtended): Promise<TransactionExtended> {
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for (const vin of transaction.vin) {
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if (vin.prevout) {
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continue;
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}
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const innerTx = await this.$getRawTransaction(vin.txid, false, false);
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vin.prevout = innerTx.vout[vin.vout];
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this.addInnerScriptsToVin(vin);
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}
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return transaction;
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}
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protected $returnCoinbaseTransaction(): Promise<IEsploraApi.Transaction> {
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return this.bitcoindClient.getBlockHash(0).then((hash: string) =>
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this.bitcoindClient.getBlock(hash, 2)
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.then((block: IBitcoinApi.Block) => {
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return this.$convertTransaction(Object.assign(block.tx[0], {
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confirmations: blocks.getCurrentBlockHeight() + 1,
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blocktime: block.time }), false);
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})
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);
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}
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private $getMempoolEntry(txid: string): Promise<IBitcoinApi.MempoolEntry> {
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return this.bitcoindClient.getMempoolEntry(txid);
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}
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private $getRawMempoolVerbose(): Promise<IBitcoinApi.RawMempool> {
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return this.bitcoindClient.getRawMemPool(true);
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}
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private async $calculateFeeFromInputs(transaction: IEsploraApi.Transaction): Promise<IEsploraApi.Transaction> {
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if (transaction.vin[0].is_coinbase) {
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transaction.fee = 0;
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return transaction;
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}
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let totalIn = 0;
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for (const vin of transaction.vin) {
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const innerTx = await this.$getRawTransaction(vin.txid, false, false);
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vin.prevout = innerTx.vout[vin.vout];
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this.addInnerScriptsToVin(vin);
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totalIn += innerTx.vout[vin.vout].value;
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}
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const totalOut = transaction.vout.reduce((p, output) => p + output.value, 0);
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transaction.fee = parseFloat((totalIn - totalOut).toFixed(8));
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return transaction;
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}
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private convertScriptSigAsm(hex: string): string {
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const buf = Buffer.from(hex, 'hex');
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const b: string[] = [];
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let i = 0;
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while (i < buf.length) {
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const op = buf[i];
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if (op >= 0x01 && op <= 0x4e) {
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i++;
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let push: number;
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if (op === 0x4c) {
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push = buf.readUInt8(i);
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b.push('OP_PUSHDATA1');
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i += 1;
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} else if (op === 0x4d) {
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push = buf.readUInt16LE(i);
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b.push('OP_PUSHDATA2');
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i += 2;
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} else if (op === 0x4e) {
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push = buf.readUInt32LE(i);
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b.push('OP_PUSHDATA4');
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i += 4;
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} else {
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push = op;
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b.push('OP_PUSHBYTES_' + push);
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}
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const data = buf.slice(i, i + push);
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if (data.length !== push) {
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break;
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}
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b.push(data.toString('hex'));
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i += data.length;
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} else {
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if (op === 0x00) {
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b.push('OP_0');
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} else if (op === 0x4f) {
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b.push('OP_PUSHNUM_NEG1');
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} else if (op === 0xb1) {
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b.push('OP_CLTV');
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} else if (op === 0xb2) {
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b.push('OP_CSV');
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} else if (op === 0xba) {
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b.push('OP_CHECKSIGADD');
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} else {
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const opcode = bitcoinjs.script.toASM([ op ]);
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if (opcode && op < 0xfd) {
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if (/^OP_(\d+)$/.test(opcode)) {
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b.push(opcode.replace(/^OP_(\d+)$/, 'OP_PUSHNUM_$1'));
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} else {
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b.push(opcode);
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}
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} else {
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b.push('OP_RETURN_' + op);
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}
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}
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i += 1;
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}
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}
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return b.join(' ');
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}
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private addInnerScriptsToVin(vin: IEsploraApi.Vin): void {
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if (!vin.prevout) {
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return;
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}
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if (vin.prevout.scriptpubkey_type === 'p2sh') {
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const redeemScript = vin.scriptsig_asm.split(' ').reverse()[0];
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vin.inner_redeemscript_asm = this.convertScriptSigAsm(redeemScript);
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if (vin.witness && vin.witness.length > 2) {
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const witnessScript = vin.witness[vin.witness.length - 1];
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vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
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}
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}
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if (vin.prevout.scriptpubkey_type === 'v0_p2wsh' && vin.witness) {
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const witnessScript = vin.witness[vin.witness.length - 1];
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vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
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}
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if (vin.prevout.scriptpubkey_type === 'v1_p2tr' && vin.witness && vin.witness.length > 1) {
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const witnessScript = vin.witness[vin.witness.length - 2];
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vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
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}
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}
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}
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export default BitcoinApi;
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