Slow down retries on Electrs errors in the main mempool loop.

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

@@ -11,7 +11,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/mempool', { json: true, timeout: 10000 }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getMempoolInfo error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else {
@@ -32,7 +32,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/mempool/txids', { json: true, timeout: 10000, forever: true }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getRawMempool error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else {
@@ -50,7 +50,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/tx/' + txId, { json: true, timeout: 10000, forever: true }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getRawTransaction error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else {
@@ -68,7 +68,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/blocks/tip/height', { json: true, timeout: 10000 }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getBlockHeightTip error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else {
@@ -82,7 +82,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/block/' + hash + '/txids', { json: true, timeout: 10000 }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getTxIdsForBlock error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else {
@@ -100,7 +100,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/block-height/' + height, { json: true, timeout: 10000 }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getBlockHash error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else  {
@@ -114,7 +114,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/blocks/' + height, { json: true, timeout: 10000 }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getBlocksFromHeight error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else  {
@@ -128,7 +128,7 @@ class ElectrsApi {
     return new Promise((resolve, reject) => {
       request(config.ELECTRS_API_URL + '/block/' + hash, { json: true, timeout: 10000 }, (err, res, response) => {
         if (err) {
-          reject(err);
+          reject('getBlock error: ' + err.message || err);
         } else if (res.statusCode !== 200) {
           reject(response);
         } else {

backend/src/api/blocks.ts

@@ -25,8 +25,7 @@ class Blocks {
     this.newBlockCallbacks.push(fn);
   }
 
-  public async updateBlocks() {
+  public async $updateBlocks() {
-    try {
     const blockHeightTip = await bitcoinApi.getBlockHeightTip();
 
     if (this.blocks.length === 0) {
@@ -100,10 +99,6 @@ class Blocks {
         this.newBlockCallbacks.forEach((cb) => cb(block, txIds, transactions));
       }
     }
-
-    } catch (err) {
-      logger.err('updateBlocks error' + err);
-    }
   }
 
   public getLastDifficultyAdjustmentTime(): number {

backend/src/api/mempool.ts

@@ -47,12 +47,8 @@ class Mempool {
     }
   }
 
-  public async updateMemPoolInfo() {
+  public async $updateMemPoolInfo() {
-    try {
     this.mempoolInfo = await bitcoinApi.getMempoolInfo();
-    } catch (e) {
-      logger.err('Error getMempoolInfo ' + e.message || e);
-    }
   }
 
   public getMempoolInfo(): MempoolInfo | undefined {
@@ -93,13 +89,12 @@ class Mempool {
     }
   }
 
-  public async updateMempool() {
+  public async $updateMempool() {
     logger.debug('Updating mempool');
     const start = new Date().getTime();
     let hasChange: boolean = false;
     const currentMempoolSize = Object.keys(this.mempoolCache).length;
     let txCount = 0;
-    try {
     const transactions = await bitcoinApi.getRawMempool();
     const diff = transactions.length - currentMempoolSize;
     const newTransactions: TransactionExtended[] = [];
@@ -184,9 +179,6 @@ class Mempool {
     const time = end - start;
     logger.debug(`New mempool size: ${Object.keys(newMempool).length} Change: ${diff}`);
     logger.debug('Mempool updated in ' + time / 1000 + ' seconds');
-    } catch (err) {
-      logger.err('getRawMempool error. ' + err.message || err);
-    }
   }
 
   private updateTxPerSecond() {

backend/src/index.ts

@@ -27,6 +27,7 @@ class Server {
   private wss: WebSocket.Server | undefined;
   private server: https.Server | http.Server | undefined;
   private app: Express;
+  private retryOnElectrsErrorAfterSeconds = 5;
 
   constructor() {
     this.app = express();
@@ -114,10 +115,18 @@ class Server {
   }
 
   async runMempoolIntervalFunctions() {
-    await memPool.updateMemPoolInfo();
+    try {
-    await blocks.updateBlocks();
+      await memPool.$updateMemPoolInfo();
-    await memPool.updateMempool();
+      await blocks.$updateBlocks();
+      await memPool.$updateMempool();
       setTimeout(this.runMempoolIntervalFunctions.bind(this), config.ELECTRS_POLL_RATE_MS);
+      this.retryOnElectrsErrorAfterSeconds = 5;
+    } catch (e) {
+      this.retryOnElectrsErrorAfterSeconds *= 2;
+      this.retryOnElectrsErrorAfterSeconds = Math.min(this.retryOnElectrsErrorAfterSeconds, 3600);
+      logger.warn(`runMempoolIntervalFunctions error: ${(e.message || e)}. Retrying in ${this.retryOnElectrsErrorAfterSeconds} sec.`);
+      setTimeout(this.runMempoolIntervalFunctions.bind(this), 1000 * this.retryOnElectrsErrorAfterSeconds);
+    }
   }
 
   setUpWebsocketHandling() {