From 905ddbb363b3f9172eecef9d7d15f2d3dc678193 Mon Sep 17 00:00:00 2001
From: softsimon <softsimon@protonmail.com>
Date: Mon, 11 Jan 2021 01:51:57 +0700
Subject: [PATCH] Bitcoind: Use mempool as address index when doing address
 prefix search.

---
 .../api/bitcoin/bitcoin-api-abstract-factory.ts  |  1 +
 backend/src/api/bitcoin/bitcoin-api.ts           | 16 ++++++++++++++++
 backend/src/api/bitcoin/esplora-api.ts           |  3 +++
 backend/src/routes.ts                            |  7 ++++++-
 backend/tslint.json                              |  2 +-
 5 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/backend/src/api/bitcoin/bitcoin-api-abstract-factory.ts b/backend/src/api/bitcoin/bitcoin-api-abstract-factory.ts
index 4dcd4b4d4..951d9576c 100644
--- a/backend/src/api/bitcoin/bitcoin-api-abstract-factory.ts
+++ b/backend/src/api/bitcoin/bitcoin-api-abstract-factory.ts
@@ -10,4 +10,5 @@ export interface AbstractBitcoinApi {
   $getBlock(hash: string): Promise<IEsploraApi.Block>;
   $getAddress(address: string): Promise<IEsploraApi.Address>;
   $getAddressTransactions(address: string, lastSeenTxId: string): Promise<IEsploraApi.Transaction[]>;
+  $getAddressPrefix(prefix: string): string[];
 }
diff --git a/backend/src/api/bitcoin/bitcoin-api.ts b/backend/src/api/bitcoin/bitcoin-api.ts
index 3f2b83041..b77b63385 100644
--- a/backend/src/api/bitcoin/bitcoin-api.ts
+++ b/backend/src/api/bitcoin/bitcoin-api.ts
@@ -90,6 +90,22 @@ class BitcoinApi implements AbstractBitcoinApi {
     return this.bitcoindClient.getRawMemPool();
   }
 
+  $getAddressPrefix(prefix: string): string[] {
+    const found: string[] = [];
+    const mp = mempool.getMempool();
+    for (const tx in mp) {
+      for (const vout of mp[tx].vout) {
+        if (vout.scriptpubkey_address.indexOf(prefix) === 0) {
+          found.push(vout.scriptpubkey_address);
+          if (found.length >= 10) {
+            return found;
+          }
+        }
+      }
+    }
+    return found;
+  }
+
   protected async $convertTransaction(transaction: IBitcoinApi.Transaction, addPrevout: boolean): Promise<IEsploraApi.Transaction> {
     let esploraTransaction: IEsploraApi.Transaction = {
       txid: transaction.txid,
diff --git a/backend/src/api/bitcoin/esplora-api.ts b/backend/src/api/bitcoin/esplora-api.ts
index df566daac..24220da3e 100644
--- a/backend/src/api/bitcoin/esplora-api.ts
+++ b/backend/src/api/bitcoin/esplora-api.ts
@@ -50,6 +50,9 @@ class ElectrsApi implements AbstractBitcoinApi {
       .then((response) => response.data);
   }
 
+  $getAddressPrefix(prefix: string): string[] {
+    throw new Error('Method not implemented.');
+  }
 }
 
 export default ElectrsApi;
diff --git a/backend/src/routes.ts b/backend/src/routes.ts
index fe6a82a8a..e35164ab0 100644
--- a/backend/src/routes.ts
+++ b/backend/src/routes.ts
@@ -660,7 +660,12 @@ class Routes {
   }
 
   public async getAddressPrefix(req: Request, res: Response) {
-    res.status(501).send('Not implemented');
+    try {
+      const blockHash = await bitcoinApi.$getAddressPrefix(req.params.prefix);
+      res.send(blockHash);
+    } catch (e) {
+      res.status(500).send(e.message || e);
+    }
   }
 
   public getTransactionOutspends(req: Request, res: Response) {
diff --git a/backend/tslint.json b/backend/tslint.json
index 65ac58f4b..945512322 100644
--- a/backend/tslint.json
+++ b/backend/tslint.json
@@ -12,7 +12,7 @@
       "severity": "warn"
     },
     "eofline": true,
-    "forin": true,
+    "forin": false,
     "import-blacklist": [
       true,
       "rxjs",