From edfbede704356bf497953d772c3e7158fa1f8af4 Mon Sep 17 00:00:00 2001
From: Mononaut <github@monospace.live>
Date: Sun, 26 Mar 2023 09:05:41 +0900
Subject: [PATCH] Don't send back difficulty adjustment info

---
 backend/src/api/websocket-handler.ts | 9 ++++++---
 backend/src/mempool.interfaces.ts    | 2 ++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/backend/src/api/websocket-handler.ts b/backend/src/api/websocket-handler.ts
index c89179ce7..7dbd48c46 100644
--- a/backend/src/api/websocket-handler.ts
+++ b/backend/src/api/websocket-handler.ts
@@ -211,6 +211,7 @@ class WebsocketHandler {
     if (!_blocks) {
       _blocks = blocks.getBlocks().slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT);
     }
+    const da = difficultyAdjustment.getDifficultyAdjustment();
     return {
       'mempoolInfo': memPool.getMempoolInfo(),
       'vBytesPerSecond': memPool.getVBytesPerSecond(),
@@ -220,7 +221,7 @@ class WebsocketHandler {
       'transactions': memPool.getLatestTransactions(),
       'backendInfo': backendInfo.getBackendInfo(),
       'loadingIndicators': loadingIndicators.getLoadingIndicators(),
-      'da': difficultyAdjustment.getDifficultyAdjustment(),
+      'da': da?.previousTime ? da : undefined,
       'fees': feeApi.getRecommendedFee(),
       ...this.extraInitProperties
     };
@@ -278,7 +279,9 @@ class WebsocketHandler {
         response['mempoolInfo'] = mempoolInfo;
         response['vBytesPerSecond'] = vBytesPerSecond;
         response['transactions'] = newTransactions.slice(0, 6).map((tx) => Common.stripTransaction(tx));
-        response['da'] = da;
+        if (da?.previousTime) {
+          response['da'] = da;
+        }
         response['fees'] = recommendedFees;
       }
 
@@ -505,7 +508,7 @@ class WebsocketHandler {
       const response = {
         'block': block,
         'mempoolInfo': memPool.getMempoolInfo(),
-        'da': da,
+        'da': da?.previousTime ? da : undefined,
         'fees': fees,
       };
 
diff --git a/backend/src/mempool.interfaces.ts b/backend/src/mempool.interfaces.ts
index 9961632c3..28c1e21b5 100644
--- a/backend/src/mempool.interfaces.ts
+++ b/backend/src/mempool.interfaces.ts
@@ -309,9 +309,11 @@ export interface IDifficultyAdjustment {
   remainingBlocks: number;
   remainingTime: number;
   previousRetarget: number;
+  previousTime: number;
   nextRetargetHeight: number;
   timeAvg: number;
   timeOffset: number;
+  expectedBlocks: number;
 }
 
 export interface IndexedDifficultyAdjustment {