From 86cca84229ff86b7a2e7c3b525c497f8f58099ad Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Tue, 6 Sep 2022 16:25:30 -0700
Subject: get block height helper

---
 lib/utils.js             | 35 +++++++++++++++++++++++++++++++++++
 routes/assets.js         |  3 +++
 routes/liquid/receive.js |  7 ++-----
 3 files changed, 40 insertions(+), 5 deletions(-)

diff --git a/lib/utils.js b/lib/utils.js
index 004ca7ac..1ff24c67 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -55,3 +55,38 @@ export const fail = msg => {
 
 export const SATS = 100000000;
 export const toSats = n => Math.round(n * SATS);
+
+export const getBlockHeight = message => {
+  let buffer = Buffer.from(message, "hex");
+  if (buffer.length < 80) throw new Error("Buffer too small (< 80 bytes)");
+
+  let offset = 0;
+  const readSlice = n => {
+    offset += n;
+    return buffer.slice(offset - n, offset);
+  };
+
+  const readUInt32 = () => {
+    const i = buffer.readUInt32LE(offset);
+    offset += 4;
+    return i;
+  };
+
+  const readUInt8 = () => {
+    const i = buffer.readUInt8(offset);
+    offset += 1;
+    return i;
+  };
+
+  const readVarInt = () => {
+    const vi = varuint.decode(buffer, offset);
+    offset += varuint.decode.bytes;
+    return vi;
+  };
+
+  readUInt32();
+  readSlice(32);
+  readSlice(32);
+  readUInt32();
+  return readUInt32();
+};
diff --git a/routes/assets.js b/routes/assets.js
index 22bf71d0..8140b179 100644
--- a/routes/assets.js
+++ b/routes/assets.js
@@ -7,6 +7,9 @@ import { auth } from "$lib/passport";
 import axios from "axios";
 import crypto from "crypto";
 import fs from "fs";
+import { err, l } from "$lib/logging";
+import lq from "$lib/liquid";
+import { SATS } from "$lib/utils";
 
 let fetchAssets;
 (fetchAssets = async () => {
diff --git a/routes/liquid/receive.js b/routes/liquid/receive.js
index f3b8397f..480677de 100644
--- a/routes/liquid/receive.js
+++ b/routes/liquid/receive.js
@@ -1,6 +1,6 @@
 import db from "$db";
 import config from "$config";
-import { toSats } from "$lib/utils";
+import { getBlockHeight, getUser, toSats } from "$lib/utils";
 import { emit } from "$lib/sockets";
 import store from "$lib/store";
 import { sendLiquid } from "$routes/liquid/send";
@@ -14,7 +14,6 @@ import bitcoin from "bitcoinjs-lib";
 import liquidJs from "liquidjs-lib";
 import { l, err, warn } from "$lib/logging";
 import lq from "$lib/liquid";
-import { getUser } from "$lib/utils";
 
 const { Block, networks, Transaction } = liquidJs;
 
@@ -224,11 +223,9 @@ zmqRawBlock.on("message", async (topic, message, sequence) => {
       where: { confirmed: 0 }
     });
 
-    const block = Block.fromHex(message.toString("hex"), true);
-
     let hash, json;
 
-    hash = await lq.getBlockHash(block.blockHeight);
+    hash = await lq.getBlockHash(getBlockHeight(message));
     json = await lq.getBlock(hash, 2);
 
     json.tx.map(async tx => {
-- 
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