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truncate remainingSatoshis to match lamassu-machine amount exactly

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This commit is contained in:
Josh Harvey 2014-12-04 14:54:10 -05:00
parent 11be090aa3
commit d68934cb53
1 changed files with 28 additions and 2 deletions
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30
lib/postgresql_interface.js
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@ -15,6 +15,8 @@ function inspect(rec) {
}
*/
var SATOSHI_FACTOR = 1e8;
function isUniqueViolation(err) {
return err.code === '23505';
}
@ -170,10 +172,34 @@ function billsAndTxs(client, session, cb) {
});
}
// TODO: these should broken out to a common library, they are used by both
// lamassu-machine and lamassu-server and need to stay in sync.
function bitcoinFractionalDigits(amount) {
var log = Math.floor(Math.log(amount) / Math.log(10));
return (log > 0) ? 2 : 2 - log;
}
function truncateBitcoins(bitcoins) {
var decimalDigits = bitcoinFractionalDigits(bitcoins);
var adjuster = Math.pow(10, decimalDigits);
return (Math.round(bitcoins * adjuster) / adjuster);
}
function truncateSatoshis(satoshis) {
var bitcoins = satoshis / SATOSHI_FACTOR;
var truncated = truncateBitcoins(bitcoins);
return Math.round(truncated * SATOSHI_FACTOR);
}
// END TODO
function computeSendAmount(tx, totals) {
var fiatRemaining = (tx.fiat || totals.billsFiat) - totals.txFiat;
var satoshisRemaining = (tx.satoshis || totals.billsSatoshis) -
totals.txSatoshis;
var result = {
fiat: (tx.fiat || totals.billsFiat) - totals.txFiat,
satoshis: (tx.satoshis || totals.billsSatoshis) - totals.txSatoshis
fiat: fiatRemaining,
satoshis: truncateSatoshis(satoshisRemaining)
};
if (result.fiat < 0 || result.satoshis < 0) {
logger.warn({tx: tx, totals: totals, result: result},