Big refactor of multiple backends handling.

2020-12-28 04:47:22 +07:00
parent 8d0db12abe
commit bb28a56622
27 changed files with 946 additions and 869 deletions
--- a/backend/src/api/bitcoin/electrum-api.ts
+++ b/backend/src/api/bitcoin/electrum-api.ts
@@ -0,0 +1,119 @@
+import config from '../../config';
+import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
+import * as ElectrumClient from '@codewarriorr/electrum-client-js';
+import { IBitcoinApi } from './bitcoin-api.interface';
+import { IEsploraApi } from './esplora-api.interface';
+import { IElectrumApi } from './electrum-api.interface';
+import * as sha256 from 'crypto-js/sha256';
+import * as hexEnc from 'crypto-js/enc-hex';
+import BitcoinApi from './bitcoin-api';
+import bitcoinBaseApi from './bitcoin-base.api';
+class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
+  private electrumClient: any;
+
+  constructor() {
+    super();
+
+    this.electrumClient = new ElectrumClient(
+      config.ELECTRS.HOST,
+      config.ELECTRS.PORT,
+      'ssl'
+    );
+
+    this.electrumClient.connect(
+      'electrum-client-js',
+      '1.4'
+    );
+  }
+
+  async $getRawTransaction(txId: string, skipConversion = false, addPrevout = false): Promise<IEsploraApi.Transaction> {
+    const transaction: IBitcoinApi.Transaction = await this.electrumClient.blockchain_transaction_get(txId, true);
+    if (!transaction) {
+      throw new Error('Unable to get transaction: ' + txId);
+    }
+    if (skipConversion) {
+      // @ts-ignore
+      return transaction;
+    }
+    return this.$convertTransaction(transaction, addPrevout);
+  }
+
+  async $getAddress(address: string): Promise<IEsploraApi.Address> {
+    const addressInfo = await bitcoinBaseApi.$validateAddress(address);
+    if (!addressInfo || !addressInfo.isvalid) {
+      return ({
+        'address': address,
+        'chain_stats': {
+          'funded_txo_count': 0,
+          'funded_txo_sum': 0,
+          'spent_txo_count': 0,
+          'spent_txo_sum': 0,
+          'tx_count': 0
+        },
+        'mempool_stats': {
+          'funded_txo_count': 0,
+          'funded_txo_sum': 0,
+          'spent_txo_count': 0,
+          'spent_txo_sum': 0,
+          'tx_count': 0
+        }
+      });
+    }
+
+    const balance = await this.$getScriptHashBalance(addressInfo.scriptPubKey);
+    const history = await this.$getScriptHashHistory(addressInfo.scriptPubKey);
+
+    const unconfirmed = history.filter((h) => h.fee).length;
+
+    return {
+      'address': addressInfo.address,
+      'chain_stats': {
+        'funded_txo_count': 0,
+        'funded_txo_sum': balance.confirmed ? balance.confirmed : 0,
+        'spent_txo_count': 0,
+        'spent_txo_sum': balance.confirmed < 0 ? balance.confirmed : 0,
+        'tx_count': history.length - unconfirmed,
+      },
+      'mempool_stats': {
+        'funded_txo_count': 0,
+        'funded_txo_sum': balance.unconfirmed > 0 ? balance.unconfirmed : 0,
+        'spent_txo_count': 0,
+        'spent_txo_sum': balance.unconfirmed < 0 ? -balance.unconfirmed : 0,
+        'tx_count': unconfirmed,
+      }
+    };
+
+  }
+
+  async $getAddressTransactions(address: string, lastSeenTxId: string): Promise<IEsploraApi.Transaction[]> {
+    const addressInfo = await bitcoinBaseApi.$validateAddress(address);
+    if (!addressInfo || !addressInfo.isvalid) {
+     return [];
+    }
+    const history = await this.$getScriptHashHistory(addressInfo.scriptPubKey);
+    const transactions: IEsploraApi.Transaction[] = [];
+    for (const h of history) {
+      const tx = await this.$getRawTransaction(h.tx_hash);
+      if (tx) {
+        transactions.push(tx);
+      }
+    }
+    return transactions;
+  }
+
+  private $getScriptHashBalance(scriptHash: string): Promise<IElectrumApi.ScriptHashBalance> {
+    return this.electrumClient.blockchain_scripthash_getBalance(this.encodeScriptHash(scriptHash));
+  }
+
+  private $getScriptHashHistory(scriptHash: string): Promise<IElectrumApi.ScriptHashHistory[]> {
+    return this.electrumClient.blockchain_scripthash_getHistory(this.encodeScriptHash(scriptHash));
+  }
+
+  private encodeScriptHash(scriptPubKey: string): string {
+    const addrScripthash = hexEnc.stringify(sha256(hexEnc.parse(scriptPubKey)));
+    return addrScripthash.match(/.{2}/g).reverse().join('');
+  }
+
+}
+
+export default BitcoindElectrsApi;