Batch esplora outspends requests

backend/src/api/bitcoin/bitcoin.routes.ts

@@ -112,6 +112,7 @@ class BitcoinRoutes {
           .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/hex', this.getRawTransaction)
           .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/status', this.getTransactionStatus)
           .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/outspends', this.getTransactionOutspends)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'txs/outspends', this.$getOutspends)
           .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/header', this.getBlockHeader)
           .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/tip/hash', this.getBlockTipHash)
           .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/raw', this.getRawBlock)
@@ -198,6 +199,26 @@ class BitcoinRoutes {
     }
   }
 
+  private async $getOutspends(req: Request, res: Response) {
+    const txids_csv = req.query.txids;
+    if (!txids_csv || typeof txids_csv !== 'string') {
+      res.status(500).send('Invalid txids format');
+      return;
+    }
+    const txids = txids_csv.split(',');
+    if (txids.length > 50) {
+      res.status(400).send('Too many txids requested');
+      return;
+    }
+
+    try {
+      const batchedOutspends = await bitcoinApi.$getBatchedOutspends(txids);
+      res.json(batchedOutspends);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
   private async $getCpfpInfo(req: Request, res: Response) {
     if (!/^[a-fA-F0-9]{64}$/.test(req.params.txId)) {
       res.status(501).send(`Invalid transaction ID.`);

backend/src/api/bitcoin/esplora-api.ts

@@ -174,6 +174,9 @@ class FailoverRouter {
       axiosConfig = { timeout: config.ESPLORA.REQUEST_TIMEOUT, responseType };
       url = host.host + path;
     }
+    if (data?.params) {
+      axiosConfig.params = data.params;
+    }
     return (method === 'post'
         ? this.requestConnection.post<T>(url, data, axiosConfig)
         : this.requestConnection.get<T>(url, axiosConfig)
@@ -193,8 +196,8 @@ class FailoverRouter {
       });
   }
 
-  public async $get<T>(path, responseType = 'json'): Promise<T> {
-    return this.$query<T>('get', path, null, responseType);
+  public async $get<T>(path, responseType = 'json', params: any = null): Promise<T> {
+    return this.$query<T>('get', path, params ? { params } : null, responseType);
   }
 
   public async $post<T>(path, data: any, responseType = 'json'): Promise<T> {
@@ -294,13 +297,8 @@ class ElectrsApi implements AbstractBitcoinApi {
     return this.failoverRouter.$get<IEsploraApi.Outspend[]>('/tx/' + txId + '/outspends');
   }
 
-  async $getBatchedOutspends(txId: string[]): Promise<IEsploraApi.Outspend[][]> {
-    const outspends: IEsploraApi.Outspend[][] = [];
-    for (const tx of txId) {
-      const outspend = await this.$getOutspends(tx);
-      outspends.push(outspend);
-    }
-    return outspends;
+  async $getBatchedOutspends(txids: string[]): Promise<IEsploraApi.Outspend[][]> {
+    return this.failoverRouter.$get<IEsploraApi.Outspend[][]>('/txs/outspends', 'json', { txids: txids.join(',') });
   }
 
   public startHealthChecks(): void {