fix: 🐛 reuse lnd connection

server/helpers/auth.ts

@@ -2,8 +2,10 @@ import { authenticatedLndGrpc } from 'ln-service';
 import { SSOType } from 'server/types/apiTypes';
 import { LndObject } from 'server/types/ln-service.types';
 import { v5 as uuidv5 } from 'uuid';
+import { getSHA256Hash } from './crypto';
 import { ParsedAccount } from './fileHelpers';
 import { logger } from './logger';
+import { SavedLnd } from './savedLnd';
 
 type LndAuthType = {
   cert: string | null;
@@ -13,6 +15,8 @@ type LndAuthType = {
 
 const THUNDERHUB_NAMESPACE = '00000000-0000-0000-0000-000000000000';
 
+export const saved = new SavedLnd();
+
 export const getUUID = (text: string): string =>
   uuidv5(text, THUNDERHUB_NAMESPACE);
 
@@ -21,6 +25,13 @@ export const getAuthLnd = (
   sso: SSOType | null,
   accounts: ParsedAccount[]
 ): LndObject | null => {
+  const hash = getSHA256Hash(JSON.stringify({ id, sso, accounts }));
+
+  if (saved.isSame(hash)) {
+    logger.silly('Using recycled LND Object');
+    return saved.lnd;
+  }
+
   if (!id) {
     logger.silly('Account not authenticated');
     return null;
@@ -56,6 +67,10 @@ export const getAuthLnd = (
     authDetails = verifiedAccount;
   }
 
+  logger.debug('Creating a new LND object');
   const { lnd } = authenticatedLndGrpc(authDetails);
+
+  saved.save(hash, lnd);
+
   return lnd;
 };

server/helpers/crypto.ts

@@ -9,14 +9,16 @@ import { logger } from './logger';
 
 export const getPreimageAndHash = () => {
   const preimage = randomBytes(32);
-  const preimageHash = createHash('sha256')
-    .update(preimage)
-    .digest()
-    .toString('hex');
+  const preimageHash = getSHA256Hash(preimage);
 
   return { preimage, hash: preimageHash };
 };
 
+export const getSHA256Hash = (
+  str: string | Buffer,
+  encoding: 'hex' | 'base64' = 'hex'
+) => createHash('sha256').update(str).digest().toString(encoding);
+
 export const getPrivateAndPublicKey = () => {
   const secretKey = bip39.generateMnemonic();
   const base58 = bip39.mnemonicToSeedSync(secretKey);

server/helpers/savedLnd.ts

@@ -0,0 +1,28 @@
+import { LndObject } from 'server/types/ln-service.types';
+
+export class SavedLnd {
+  hash: string | null;
+  lnd: LndObject | null;
+
+  constructor() {
+    this.hash = null;
+    this.lnd = null;
+  }
+
+  save(hash: string, lnd: LndObject) {
+    this.hash = hash;
+    this.lnd = lnd;
+  }
+
+  reset() {
+    this.hash = null;
+    this.lnd = null;
+  }
+
+  isSame(hash: string): boolean {
+    if (hash === this.hash && this.lnd) {
+      return true;
+    }
+    return false;
+  }
+}

server/schema/account/resolvers.ts

@@ -1,6 +1,7 @@
 import { ContextType } from 'server/types/apiTypes';
 import { logger } from 'server/helpers/logger';
 import { requestLimiter } from 'server/helpers/rateLimiter';
+import { saved } from 'server/helpers/auth';
 
 export const accountResolvers = {
   Query: {
@@ -39,6 +40,8 @@ export const accountResolvers = {
       const { ip, accounts, id, sso } = context;
       await requestLimiter(ip, 'getServerAccounts');
 
+      saved.reset();
+
       let ssoAccount = null;
       if (id === 'sso' && sso) {
         const { cert, socket } = sso;