balance check in status response for min 5 transactions

src/app.ts

@@ -72,14 +72,15 @@ app.get('/status', async (req, res) => {
     avatar: 'https://example.com/avatar.png',
   })
   const hasEnoughFunds = await joy.invitingAccountHasFundsToGift(
-    exampleGiftMembershipTx
+    exampleGiftMembershipTx,
+    5
   )
 
   if (!hasEnoughFunds) {
     res.status(503).send({
       isSynced: true,
       hasEnoughFunds: false,
-      message: 'Inviting account does not have enough funds to gift membership',
+      message: 'Inviting account has limited funds for at most 5 new members.',
       limit,
     })
     return
@@ -146,7 +147,7 @@ app.post('/register', async (req, res) => {
   }
 
   processingRequest.lock(async () => {
-    const end = metrics.response_time.startTimer()
+    const stopTimer = metrics.response_time.startTimer()
     try {
       await register(
         req.ip,
@@ -170,7 +171,7 @@ app.post('/register', async (req, res) => {
         1
       )
     }
-    metrics.response_time.observe(end())
+    stopTimer()
   })
 })
 

src/joyApi.ts

@@ -220,16 +220,21 @@ export class JoyApi {
     })
   }
 
+  // Checks if balance has enough to gift N new memberships
   async invitingAccountHasFundsToGift(
-    tx: SubmittableExtrinsic<'promise'>
+    tx: SubmittableExtrinsic<'promise'>,
+    N: number = 1
   ): Promise<boolean> {
     const balance = await this.api.derive.balances.all(
       this.signingPair!.address
     )
     const membershipFee = await this.api.query.members.membershipPrice()
     const credit = createType('u128', BALANCE_CREDIT || 0)
     const txFees = (await tx.paymentInfo(this.signingPair!.address)).partialFee
-    const requiredFunds = membershipFee.add(txFees).add(credit)
+    const requiredFunds = membershipFee
+      .add(txFees)
+      .add(credit)
+      .mul(createType('u128', N))
     return balance.availableBalance.gt(requiredFunds)
   }
 }