Use new bulk endpoints to speed up forensics

backend/src/api/bitcoin/bitcoin-api-abstract-factory.ts

@@ -24,6 +24,7 @@ export interface AbstractBitcoinApi {
   $getOutspend(txId: string, vout: number): Promise<IEsploraApi.Outspend>;
   $getOutspends(txId: string): Promise<IEsploraApi.Outspend[]>;
   $getBatchedOutspends(txId: string[]): Promise<IEsploraApi.Outspend[][]>;
+  $getBatchedOutspendsInternal(txId: string[]): Promise<IEsploraApi.Outspend[][]>;
 
   startHealthChecks(): void;
 }

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

@@ -60,8 +60,17 @@ class BitcoinApi implements AbstractBitcoinApi {
       });
   }
 
-  $getRawTransactions(txids: string[]): Promise<IEsploraApi.Transaction[]> {
-    throw new Error('Method getRawTransactions not supported by the Bitcoin RPC API.');
+  async $getRawTransactions(txids: string[]): Promise<IEsploraApi.Transaction[]> {
+    const txs: IEsploraApi.Transaction[] = [];
+    for (const txid of txids) {
+      try {
+        const tx = await this.$getRawTransaction(txid, false, true);
+        txs.push(tx);
+      } catch (err) {
+        // skip failures
+      }
+    }
+    return txs;
   }
 
   $getMempoolTransactions(txids: string[]): Promise<IEsploraApi.Transaction[]> {
@@ -202,6 +211,10 @@ class BitcoinApi implements AbstractBitcoinApi {
     return outspends;
   }
 
+  async $getBatchedOutspendsInternal(txId: string[]): Promise<IEsploraApi.Outspend[][]> {
+    return this.$getBatchedOutspends(txId);
+  }
+
   $getEstimatedHashrate(blockHeight: number): Promise<number> {
     // 120 is the default block span in Core
     return this.bitcoindClient.getNetworkHashPs(120, blockHeight);

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

@@ -301,6 +301,19 @@ class ElectrsApi implements AbstractBitcoinApi {
     throw new Error('Method not implemented.');
   }
 
+  async $getBatchedOutspendsInternal(txids: string[]): Promise<IEsploraApi.Outspend[][]> {
+    const allOutspends: IEsploraApi.Outspend[][] = [];
+    const sliceLength = 50;
+    for (let i = 0; i < Math.ceil(txids.length / sliceLength); i++) {
+      const slice = txids.slice(i * sliceLength, (i + 1) * sliceLength);
+      const sliceOutspends = await this.failoverRouter.$get<IEsploraApi.Outspend[][]>('/txs/outspends', 'json', { txids: slice.join(',') });
+      for (const outspends of sliceOutspends) {
+        allOutspends.push(outspends);
+      }
+    }
+    return allOutspends;
+  }
+
   public startHealthChecks(): void {
     this.failoverRouter.startHealthChecks();
   }