From 32733a30230ef8bea9c8d6afc97883f157d690a0 Mon Sep 17 00:00:00 2001
From: nymkappa <1612910616@pm.me>
Date: Sun, 26 Feb 2023 11:30:12 +0900
Subject: [PATCH 1/2] When we re-index blocks due to mining pools change, wipe
 the nodejs backend cache

---
 backend/src/api/disk-cache.ts   | 1 +
 backend/src/api/pools-parser.ts | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/backend/src/api/disk-cache.ts b/backend/src/api/disk-cache.ts
index a75fd43cc..e466982ad 100644
--- a/backend/src/api/disk-cache.ts
+++ b/backend/src/api/disk-cache.ts
@@ -62,6 +62,7 @@ class DiskCache {
   }
 
   wipeCache() {
+    logger.notice(`Wipping nodejs backend cache/cache*.json files`);
     fs.unlinkSync(DiskCache.FILE_NAME);
     for (let i = 1; i < DiskCache.CHUNK_FILES; i++) {
       fs.unlinkSync(DiskCache.FILE_NAMES.replace('{number}', i.toString()));
diff --git a/backend/src/api/pools-parser.ts b/backend/src/api/pools-parser.ts
index 4e67ce98b..d1705b829 100644
--- a/backend/src/api/pools-parser.ts
+++ b/backend/src/api/pools-parser.ts
@@ -3,6 +3,7 @@ import logger from '../logger';
 import config from '../config';
 import PoolsRepository from '../repositories/PoolsRepository';
 import { PoolTag } from '../mempool.interfaces';
+import diskCache from './disk-cache';
 
 class PoolsParser {
   miningPools: any[] = [];
@@ -139,6 +140,10 @@ class PoolsParser {
       WHERE pool_id = ?`,
       [pool.id]
     );
+
+    // We also need to wipe the backend cache to make sure we don't serve blocks with
+    // the wrong mining pool (usually happen with unknown blocks)
+    diskCache.wipeCache();
   }
 
   private async $deleteUnknownBlocks(): Promise<void> {
@@ -149,6 +154,10 @@ class PoolsParser {
       WHERE pool_id = ? AND height >= 130635`,
       [unknownPool[0].id]
     );
+
+    // We also need to wipe the backend cache to make sure we don't serve blocks with
+    // the wrong mining pool (usually happen with unknown blocks)
+    diskCache.wipeCache();
   }
 }
 

From 9a4a5ad94e0f1eed983de118a1f9ced4719dc5f5 Mon Sep 17 00:00:00 2001
From: nymkappa <1612910616@pm.me>
Date: Sun, 26 Feb 2023 11:37:57 +0900
Subject: [PATCH 2/2] Silence ENOENT exception when we wipe the nodejs backend
 cache

---
 backend/src/api/disk-cache.ts | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/backend/src/api/disk-cache.ts b/backend/src/api/disk-cache.ts
index e466982ad..c6af20e29 100644
--- a/backend/src/api/disk-cache.ts
+++ b/backend/src/api/disk-cache.ts
@@ -63,9 +63,23 @@ class DiskCache {
 
   wipeCache() {
     logger.notice(`Wipping nodejs backend cache/cache*.json files`);
-    fs.unlinkSync(DiskCache.FILE_NAME);
+    try {
+      fs.unlinkSync(DiskCache.FILE_NAME);
+    } catch (e: any) {
+      if (e?.code !== 'ENOENT') {
+        logger.err(`Cannot wipe cache file ${DiskCache.FILE_NAME}. Exception ${JSON.stringify(e)}`);
+      }
+    }
+
     for (let i = 1; i < DiskCache.CHUNK_FILES; i++) {
-      fs.unlinkSync(DiskCache.FILE_NAMES.replace('{number}', i.toString()));
+      const filename = DiskCache.FILE_NAMES.replace('{number}', i.toString());
+      try {
+        fs.unlinkSync(filename);
+      } catch (e: any) {
+        if (e?.code !== 'ENOENT') {
+          logger.err(`Cannot wipe cache file ${filename}. Exception ${JSON.stringify(e)}`);
+        }
+      }
     }
   }