implement redis cache for context

src/Graphql/graphql.service.ts

@@ -1,12 +1,22 @@
-import { Injectable, Logger, UnauthorizedException } from '@nestjs/common';
+import {
+  Inject,
+  Injectable,
+  Logger,
+  UnauthorizedException,
+} from '@nestjs/common';
 
 import { PrismaService } from '../Prisma/prisma.service';
 import { Request } from 'express';
 import { clerkClient } from '@clerk/express';
 
+import { RedisService } from '../Redis/redis.service';
+
 @Injectable()
 export class GraphqlService {
-  constructor(private readonly prisma: PrismaService) {}
+  constructor(
+    private readonly prisma: PrismaService,
+    @Inject('REDIS_CLIENT') private readonly redis: RedisService,
+  ) {}
 
   async acquireContext(req: Request) {
     // get x-session-id from headers
@@ -24,6 +34,11 @@ export class GraphqlService {
     if (disableAuth) {
       return null;
     }
+    // redis context cache
+    const cachedUser = await this.redis.getUser(sessionId);
+    if (cachedUser) {
+      return cachedUser;
+    }
     // check if the token is valid
     const session = await clerkClient.sessions.getSession(sessionId as string);
     if (!session) {
@@ -35,7 +50,7 @@ export class GraphqlService {
     if (!user) {
       throw new UnauthorizedException('User not found');
     }
-    Logger.log(`User ${user.name} with id ${user.id} acquired context`);
+    await this.redis.setUser(sessionId, user, session.expireAt);
     return user;
   }
 }