Refactor blocks.ts and index 10k block headers at launch

backend/src/repositories/BlocksRepository.ts

@@ -0,0 +1,73 @@
+import { IEsploraApi } from "../api/bitcoin/esplora-api.interface";
+import { BlockExtended, PoolTag } from "../mempool.interfaces";
+import { DB } from "../database";
+import logger from "../logger";
+import bitcoinApi from '../api/bitcoin/bitcoin-api-factory';
+
+class BlocksRepository {
+  /**
+   * Save indexed block data in the database
+   * @param block 
+   * @param blockHash 
+   * @param coinbaseTxid 
+   * @param poolTag 
+   */
+  public async $saveBlockInDatabase(
+    block: BlockExtended,
+    blockHash: string,
+    coinbaseHex: string | undefined,
+    poolTag: PoolTag
+  ) {
+    const connection = await DB.pool.getConnection();
+
+    try {
+      const query = `INSERT INTO blocks(
+        height,  hash,     timestamp,    size,
+        weight,  tx_count, coinbase_raw, difficulty,
+        pool_id, fees,     fee_span,     median_fee
+      ) VALUE (
+        ?, ?, ?, ?,
+        ?, ?, ?, ?,
+        ?, ?, ?, ?
+      )`;
+
+      const params: any[] = [
+        block.height, blockHash, block.timestamp, block.size,
+        block.weight, block.tx_count, coinbaseHex ? coinbaseHex : "", block.difficulty,
+        poolTag.id, 0, "[]", block.medianFee,
+      ];
+
+      await connection.query(query, params);
+    } catch (e) {
+      console.log(e);
+      logger.err('$updateBlocksDatabase() error' + (e instanceof Error ? e.message : e));
+    }
+
+    connection.release();
+  }
+
+  /**
+   * Check if a block has already been indexed in the database. Query the databse directly.
+   * This can be cached/optimized if required later on to avoid too many db queries.
+   * @param blockHeight
+   * @returns
+   */
+  public async $isBlockAlreadyIndexed(blockHeight: number) {
+    const connection = await DB.pool.getConnection();
+    let exists = false;
+
+    try {
+      const query = `SELECT height from blocks where blocks.height = ${blockHeight}`;
+      const [rows]: any[] = await connection.query(query);
+      exists = rows.length === 1;
+    } catch (e) {
+      console.log(e);
+      logger.err('$isBlockAlreadyIndexed() error' + (e instanceof Error ? e.message : e));
+    }
+    connection.release();
+
+    return exists;
+  }
+}
+
+export default new BlocksRepository();