From aeb896e200281af1bdb2190c9dd64612eac583a0 Mon Sep 17 00:00:00 2001
From: softsimon <softsimon@protonmail.com>
Date: Thu, 25 May 2023 19:05:29 +0400
Subject: [PATCH 1/2] Don't wipe mempool cache in pools updater

---
 backend/src/api/disk-cache.ts   | 11 +++++++++--
 backend/src/api/pools-parser.ts |  2 +-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/backend/src/api/disk-cache.ts b/backend/src/api/disk-cache.ts
index 0264fe1a3..2e3ff6fb1 100644
--- a/backend/src/api/disk-cache.ts
+++ b/backend/src/api/disk-cache.ts
@@ -21,6 +21,7 @@ class DiskCache {
   private static RBF_FILE_NAME = config.MEMPOOL.CACHE_DIR + '/rbfcache.json';
   private static CHUNK_FILES = 25;
   private isWritingCache = false;
+  private ignoreBlocksCache = false;
 
   private semaphore: { resume: (() => void)[], locks: number } = {
     resume: [],
@@ -218,8 +219,10 @@ class DiskCache {
       }
 
       await memPool.$setMempool(data.mempool);
-      blocks.setBlocks(data.blocks);
-      blocks.setBlockSummaries(data.blockSummaries || []);
+      if (!this.ignoreBlocksCache) {
+        blocks.setBlocks(data.blocks);
+        blocks.setBlockSummaries(data.blockSummaries || []);
+      }
     } catch (e) {
       logger.warn('Failed to parse mempoool and blocks cache. Skipping. Reason: ' + (e instanceof Error ? e.message : e));
     }
@@ -273,6 +276,10 @@ class DiskCache {
       }
     }
   }
+
+  public setIgnoreBlocksCache(): void {
+    this.ignoreBlocksCache = true;
+  }
 }
 
 export default new DiskCache();
diff --git a/backend/src/api/pools-parser.ts b/backend/src/api/pools-parser.ts
index f94c147a2..7397c5639 100644
--- a/backend/src/api/pools-parser.ts
+++ b/backend/src/api/pools-parser.ts
@@ -41,7 +41,7 @@ class PoolsParser {
   public async migratePoolsJson(): Promise<void> {
     // 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();
+    diskCache.setIgnoreBlocksCache();
 
     await this.$insertUnknownPool();
 

From 038f9659bb9b55c5634729f5e6aef1a8a5160256 Mon Sep 17 00:00:00 2001
From: softsimon <softsimon@protonmail.com>
Date: Thu, 25 May 2023 19:19:14 +0400
Subject: [PATCH 2/2] Save new disk cache after ignoring blocks

---
 backend/src/api/disk-cache.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backend/src/api/disk-cache.ts b/backend/src/api/disk-cache.ts
index 2e3ff6fb1..17d75d07b 100644
--- a/backend/src/api/disk-cache.ts
+++ b/backend/src/api/disk-cache.ts
@@ -222,6 +222,9 @@ class DiskCache {
       if (!this.ignoreBlocksCache) {
         blocks.setBlocks(data.blocks);
         blocks.setBlockSummaries(data.blockSummaries || []);
+      } else {
+        logger.info('Re-saving cache with empty recent blocks data');
+        await this.$saveCacheToDisk(true);
       }
     } catch (e) {
       logger.warn('Failed to parse mempoool and blocks cache. Skipping. Reason: ' + (e instanceof Error ? e.message : e));