From 0aea60330afff02ad8bb525c5fddd7c367abf03a Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Tue, 4 Apr 2023 00:05:23 -0700
Subject: skip processed payments

---
 lib/lightning.js |  5 ++++-
 lib/payments.js  | 10 +++++++++-
 lib/rates.js     |  6 +++---
 3 files changed, 16 insertions(+), 5 deletions(-)

(limited to 'lib')

diff --git a/lib/lightning.js b/lib/lightning.js
index c9b41533..7ef62cc9 100644
--- a/lib/lightning.js
+++ b/lib/lightning.js
@@ -15,7 +15,7 @@ export async function listenForLightning() {
     pay_index,
     status,
     msatoshi_received,
-    payment_preimage: preimage,
+    payment_preimage: preimage
   } = event;
 
   await s("pay_index", pay_index);
@@ -31,6 +31,9 @@ export async function listenForLightning() {
     let invoice = await g(`invoice:${hash}`);
     if (!invoice) return warn("received lightning with no invoice", bolt11);
 
+    let payment = await g(`payment:${hash}`);
+    if (payment) return warn("already processed", hash);
+
     await credit(hash, received, invoice.memo, preimage, types.lightning);
   } catch (e) {
     console.log(e);
diff --git a/lib/payments.js b/lib/payments.js
index 6e2e3a99..5dc24c9b 100644
--- a/lib/payments.js
+++ b/lib/payments.js
@@ -115,7 +115,15 @@ export let credit = async (hash, amount, memo, ref, type = types.internal) => {
   let { id: uid, currency, username } = user;
 
   let rate = store.rates[currency];
-  if (Math.abs(invoice.rate / rate - 1) < 0.01) rate = invoice.rate;
+
+  let equivalentRate =
+    invoice.rate * (store.rates[currency] / store.rates[invoice.currency]);
+
+  if (Math.abs(invoice.rate / store.rates[invoice.currency] - 1) < 0.01) {
+    rate = equivalentRate;
+  } else {
+    warn("rate slipped", hash, invoice.rate, equivalentRate);
+  }
 
   let p = {
     hash,
diff --git a/lib/rates.js b/lib/rates.js
index 0b2daab2..362aaa98 100644
--- a/lib/rates.js
+++ b/lib/rates.js
@@ -15,11 +15,11 @@ let connect = async () => {
 
   ws = new WebSocket("wss://stream.binance.com:9443/ws/btcusdt@ticker");
 
-  ws.onmessage = async function (event) {
+  ws.onmessage = async function(event) {
     try {
       let msg = JSON.parse(event.data);
 
-      Object.keys(store.fx).map((symbol) => {
+      Object.keys(store.fx).map(symbol => {
         store.rates[symbol] = msg.c * store.fx[symbol];
       });
 
@@ -31,7 +31,7 @@ let connect = async () => {
     }
   };
 
-  ws.onerror = async function (error) {
+  ws.onerror = async function(error) {
     err("binance socket error", error.message);
   };
 
-- 
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