Replace cached blocks on reorg, serve stale blocks

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

@@ -29,6 +29,7 @@ class BitcoinApi implements AbstractBitcoinApi {
       weight: block.weight,
       previousblockhash: block.previousblockhash,
       mediantime: block.mediantime,
+      stale: block.confirmations === -1,
     };
   }
 

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

@@ -89,6 +89,7 @@ export namespace IEsploraApi {
     weight: number;
     previousblockhash: string;
     mediantime: number;
+    stale: boolean;
   }
 
   export interface Address {

backend/src/api/blocks.ts

@@ -656,10 +656,6 @@ class Blocks {
       const blockSummary: BlockSummary = this.summarizeBlockTransactions(block.id, cpfpSummary.transactions);
       this.updateTimerProgress(timer, `got block data for ${this.currentBlockHeight}`);
 
-      // start async callbacks
-      this.updateTimerProgress(timer, `starting async callbacks for ${this.currentBlockHeight}`);
-      const callbackPromises = this.newAsyncBlockCallbacks.map((cb) => cb(blockExtended, txIds, transactions));
-
       if (Common.indexingEnabled()) {
         if (!fastForwarded) {
           const lastBlock = await blocksRepository.$getBlockByHeight(blockExtended.height - 1);
@@ -671,9 +667,11 @@ class Blocks {
             await BlocksRepository.$deleteBlocksFrom(lastBlock.height - 10);
             await HashratesRepository.$deleteLastEntries();
             await cpfpRepository.$deleteClustersFrom(lastBlock.height - 10);
+            this.blocks = this.blocks.slice(0, -10);
             this.updateTimerProgress(timer, `rolled back chain divergence from ${this.currentBlockHeight}`);
             for (let i = 10; i >= 0; --i) {
               const newBlock = await this.$indexBlock(lastBlock.height - i);
+              this.blocks.push(newBlock);
               this.updateTimerProgress(timer, `reindexed block`);
               let cpfpSummary;
               if (config.MEMPOOL.CPFP_INDEXING) {
@@ -722,6 +720,10 @@ class Blocks {
         }
       }
 
+      // start async callbacks
+      this.updateTimerProgress(timer, `starting async callbacks for ${this.currentBlockHeight}`);
+      const callbackPromises = this.newAsyncBlockCallbacks.map((cb) => cb(blockExtended, txIds, transactions));
+
       if (block.height % 2016 === 0) {
         if (Common.indexingEnabled()) {
           await DifficultyAdjustmentsRepository.$saveAdjustments({
@@ -814,6 +816,16 @@ class Blocks {
     return blockExtended;
   }
 
+  public async $indexStaleBlock(hash: string): Promise<BlockExtended> {
+    const block: IEsploraApi.Block = await bitcoinCoreApi.$getBlock(hash);
+    const transactions = await this.$getTransactionsExtended(hash, block.height, true);
+    const blockExtended = await this.$getBlockExtended(block, transactions);
+
+    blockExtended.canonical = await bitcoinApi.$getBlockHash(block.height);
+
+    return blockExtended;
+  }
+
   /**
    * Get one block by its hash
    */
@@ -831,7 +843,11 @@ class Blocks {
 
     // Bitcoin network, add our custom data on top
     const block: IEsploraApi.Block = await bitcoinCoreApi.$getBlock(hash);
-    return await this.$indexBlock(block.height);
+    if (block.stale) {
+      return await this.$indexStaleBlock(hash);
+    } else {
+      return await this.$indexBlock(block.height);
+    }
   }
 
   public async $getStrippedBlockTransactions(hash: string, skipMemoryCache = false,

backend/src/repositories/BlocksAuditsRepository.ts

@@ -62,8 +62,7 @@ class BlocksAuditRepositories {
   public async $getBlockAudit(hash: string): Promise<any> {
     try {
       const [rows]: any[] = await DB.query(
-        `SELECT blocks.height, blocks.hash as id, UNIX_TIMESTAMP(blocks.blockTimestamp) as timestamp, blocks.size,
-        blocks.weight, blocks.tx_count,
+        `SELECT blocks_audits.height, blocks_audits.hash as id, UNIX_TIMESTAMP(blocks_audits.time) as timestamp,
         template,
         missing_txs as missingTxs,
         added_txs as addedTxs,
@@ -73,7 +72,6 @@ class BlocksAuditRepositories {
         expected_fees as expectedFees,
         expected_weight as expectedWeight
         FROM blocks_audits
-        JOIN blocks ON blocks.hash = blocks_audits.hash
         JOIN blocks_templates ON blocks_templates.id = blocks_audits.hash
         WHERE blocks_audits.hash = "${hash}"
       `);

frontend/src/app/interfaces/electrs.interface.ts

@@ -120,6 +120,7 @@ export interface Block {
   size: number;
   weight: number;
   previousblockhash: string;
+  stale?: boolean;
 }
 
 export interface Address {