Merge pull request #3178 from mempool/mononaut/clear-block-cache

Reset scrolling blockchain cache when network changes

frontend/src/app/services/cache.service.ts

@@ -17,6 +17,7 @@ export class CacheService {
 
   txCache: { [txid: string]: Transaction } = {};
 
+  network: string;
   blockCache: { [height: number]: BlockExtended } = {};
   blockLoading: { [height: number]: boolean } = {};
   copiesInBlockQueue: { [height: number]: number } = {};
@@ -33,6 +34,10 @@ export class CacheService {
     this.stateService.chainTip$.subscribe((height) => {
       this.tip = height;
     });
+    this.stateService.networkChanged$.subscribe((network) => {
+      this.network = network;
+      this.resetBlockCache();
+    });
   }
 
   setTxCache(transactions) {
@@ -68,15 +73,17 @@ export class CacheService {
       } catch (e) {
         console.log("failed to load blocks: ", e.message);
       }
-      for (let i = 0; i < chunkSize; i++) {
-        delete this.blockLoading[maxHeight - i];
-      }
       if (result && result.length) {
         result.forEach(block => {
-          this.addBlockToCache(block);
-          this.loadedBlocks$.next(block);
+          if (this.blockLoading[block.height]) {
+            this.addBlockToCache(block);
+            this.loadedBlocks$.next(block);
+          }
         });
       }
+      for (let i = 0; i < chunkSize; i++) {
+        delete this.blockLoading[maxHeight - i];
+      }
       this.clearBlocks();
     } else {
       this.bumpBlockPriority(height);
@@ -104,6 +111,14 @@ export class CacheService {
     }
   }
 
+  // remove all blocks from the cache
+  resetBlockCache() {
+    this.blockCache = {};
+    this.blockLoading = {};
+    this.copiesInBlockQueue = {};
+    this.blockPriorities = [];
+  }
+
   getCachedBlock(height) {
     return this.blockCache[height];
   }