From 0481598ebc1e01c44b5cf198a07685d4f29682d7 Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Wed, 3 Jun 2020 13:49:24 -0700
Subject: full sweep option

---
 routes/bitcoin/sweep.js | 40 ++++++++++++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 8 deletions(-)

diff --git a/routes/bitcoin/sweep.js b/routes/bitcoin/sweep.js
index 37efb73f..8b7bf5aa 100644
--- a/routes/bitcoin/sweep.js
+++ b/routes/bitcoin/sweep.js
@@ -9,14 +9,25 @@ const network = prod
   : bitcoin.networks["regtest"];
 
 module.exports = async (req, res) => {
-  let ecpair = bitcoin.ECPair.fromWIF('cVosbTBiXp7LYSiGVRZfZnrEjpao4X4CUTG7Ze21XM3zFTLPCMvk', network);
+  let ecpair = bitcoin.ECPair.fromWIF(
+    "cVosbTBiXp7LYSiGVRZfZnrEjpao4X4CUTG7Ze21XM3zFTLPCMvk",
+    network
+  );
 
   let { address: from, amount, feeRate, target } = req.body;
   let utxos;
-  if (!feeRate)
-    feeRate = ((await bc.estimateSmartFee(6)).feerate * SATS);
+  if (!feeRate) feeRate = (await bc.estimateSmartFee(6)).feerate * SATS;
   feeRate = Math.round(feeRate / 1000);
   l.info("sweeping", req.user.username, from, amount, feeRate);
+
+  let {
+    data: {
+      chain_stats: { funded_txo_sum: funded, spent_txo_sum: spent }
+    }
+  } = await axios.get(`${api}/address/${from}`);
+
+  let balance = funded - spent;
+
   try {
     ({ data: utxos } = await axios.get(`${api}/address/${from}/utxo`));
   } catch (e) {
@@ -32,28 +43,41 @@ module.exports = async (req, res) => {
 
   let { inputs, outputs, fee } = coinselect(utxos, targets, feeRate);
 
-  if (!inputs || !outputs) return res.status(500).send("Unable to construct sweep transaction, try a lower fee rate?");
+  if (balance === amount) {
+    delete targets[0].value;
+    ({ inputs, outputs, fee } = split(utxos, targets, feeRate));
+    l.info("split", inputs, outputs, fee);
+  }
+
+  if (!inputs || !outputs)
+    return res
+      .status(500)
+      .send("Unable to construct sweep transaction, try a lower fee rate?");
 
   let psbt = new bitcoin.Psbt({ network });
+  let total = 0;
 
   outputs.map(({ address, value }) => {
+    total += value;
     psbt = psbt.addOutput({
       address: address || from,
       value
-    })
+    });
   });
 
   for (let i = 0; i < inputs.length; i++) {
     let { txid, vout } = inputs[i];
-    let nonWitnessUtxo = Buffer.from(await bc.getRawTransaction(txid), 'hex');
+    let nonWitnessUtxo = Buffer.from(await bc.getRawTransaction(txid), "hex");
     psbt = psbt.addInput({
       hash: txid,
       index: vout,
-      nonWitnessUtxo,
+      nonWitnessUtxo
     });
   }
 
   feeRate = Math.round(feeRate * 1000);
   psbt = psbt.toBase64();
-  res.send({ feeRate, psbt });
+
+  console.log(total);
+  res.send({ feeRate, psbt, total });
 };
-- 
cgit v1.2.3