From 8b1fada052b65988977e1425b486e06f3b2c39f8 Mon Sep 17 00:00:00 2001
From: ChaituVR <yourchaitu@gmail.com>
Date: Thu, 3 Aug 2023 01:15:32 +0530
Subject: [PATCH 1/2] Replace EE with requestDeduplicator

---
 src/graphql/operations/votes.ts    |  2 +-
 src/helpers/ee.ts                  | 20 --------------------
 src/helpers/requestDeduplicator.ts | 22 ++++++++++++++++++++++
 3 files changed, 23 insertions(+), 21 deletions(-)
 delete mode 100644 src/helpers/ee.ts
 create mode 100644 src/helpers/requestDeduplicator.ts

diff --git a/src/graphql/operations/votes.ts b/src/graphql/operations/votes.ts
index fcf058d2..1036abfc 100644
--- a/src/graphql/operations/votes.ts
+++ b/src/graphql/operations/votes.ts
@@ -1,7 +1,7 @@
 import graphqlFields from 'graphql-fields';
 import db from '../../helpers/mysql';
 import { buildWhereQuery, checkLimits, formatProposal, formatSpace, formatVote } from '../helpers';
-import serve from '../../helpers/ee';
+import serve from '../../helpers/requestDeduplicator';
 import log from '../../helpers/log';
 import { capture } from '@snapshot-labs/snapshot-sentry';
 
diff --git a/src/helpers/ee.ts b/src/helpers/ee.ts
deleted file mode 100644
index fc227a0f..00000000
--- a/src/helpers/ee.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import events from 'events';
-import { sha256 } from './utils';
-
-const eventEmitter = new events.EventEmitter();
-eventEmitter.setMaxListeners(1000); // https://stackoverflow.com/a/26176922
-
-export default async function serve(id, action, args) {
-  const key = sha256(id);
-  // eslint-disable-next-line no-async-promise-executor
-  return new Promise(async (resolve, reject) => {
-    eventEmitter.once(key, data => (data.error ? reject(data.e) : resolve(data)));
-    if (eventEmitter.listenerCount(key) === 1) {
-      try {
-        eventEmitter.emit(key, await action(...args));
-      } catch (e) {
-        eventEmitter.emit(key, { error: true, e });
-      }
-    }
-  });
-}
diff --git a/src/helpers/requestDeduplicator.ts b/src/helpers/requestDeduplicator.ts
new file mode 100644
index 00000000..2cfe431a
--- /dev/null
+++ b/src/helpers/requestDeduplicator.ts
@@ -0,0 +1,22 @@
+import { sha256 } from './utils';
+
+const ongoingRequests = new Map();
+
+export default async function serve(id, action, args) {
+  const key = sha256(id);
+  if (!ongoingRequests.has(key)) {
+    const requestPromise = action(...args)
+      .then(result => {
+        ongoingRequests.delete(key);
+        return result;
+      })
+      .catch(e => {
+        console.log('EventEmitter Error', e);
+        ongoingRequests.delete(key);
+        throw { error: true, e };
+      });
+    ongoingRequests.set(key, requestPromise);
+  }
+
+  return ongoingRequests.get(key);
+}

From 60a151cf349a73a8e80bdb579e3b82ceae2de599 Mon Sep 17 00:00:00 2001
From: Chaitanya <yourchaitu@gmail.com>
Date: Fri, 4 Aug 2023 00:13:48 +0530
Subject: [PATCH 2/2] Update src/helpers/requestDeduplicator.ts

---
 src/helpers/requestDeduplicator.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/helpers/requestDeduplicator.ts b/src/helpers/requestDeduplicator.ts
index 2cfe431a..55e21964 100644
--- a/src/helpers/requestDeduplicator.ts
+++ b/src/helpers/requestDeduplicator.ts
@@ -11,9 +11,8 @@ export default async function serve(id, action, args) {
         return result;
       })
       .catch(e => {
-        console.log('EventEmitter Error', e);
         ongoingRequests.delete(key);
-        throw { error: true, e };
+        throw e;
       });
     ongoingRequests.set(key, requestPromise);
   }