From 1ae4c03116ce3a650af88f78a4b5d19581238c71 Mon Sep 17 00:00:00 2001 From: Adam Soltys Date: Mon, 9 Mar 2020 10:59:04 -0700 Subject: fee estimation --- estimateBitcoinFee.js | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 estimateBitcoinFee.js (limited to 'estimateBitcoinFee.js') diff --git a/estimateBitcoinFee.js b/estimateBitcoinFee.js new file mode 100644 index 00000000..215a180d --- /dev/null +++ b/estimateBitcoinFee.js @@ -0,0 +1,32 @@ +const config = require("./config"); + +const l = require("pino")(); +const SATS = 100000000; + +module.exports = (app, bc, db, emit) => async (req, res) => { + let { user } = req; + let { address, amount, confTarget, feeRate, mode } = req.body; + let tx, fee; + + try { + amount = parseInt(amount); + + tx = await bc.createRawTransaction([], { + [address]: (amount / SATS).toFixed(8) + }); + + let params = { + subtractFeeFromOutputs: amount === user.balance ? [0] : [] + } + + if (feeRate) params["feeRate"] = (parseInt(feeRate) / SATS * 1000).toFixed(8); + if (confTarget) params["conf_target"] = parseInt(confTarget); + if (mode) params["estimate_mode"] = mode; + + tx = await bc.fundRawTransaction(tx, params); + res.send({ tx }); + } catch (e) { + l.error(e); + return res.status(500).send(e.message); + } +}; -- cgit v1.2.3