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hard fee calculation.

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This commit is contained in:
Christopher Jeffrey 2016-01-12 04:08:25 -08:00
parent 3c8442b1bb
commit 7b27f5dc9b
1 changed files with 45 additions and 27 deletions
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72
lib/bcoin/tx.js
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@ -41,6 +41,10 @@ function TX(data, block) {
this._lock = this.lock;
this._fee = !(data instanceof bcoin.tx)
? data.fee
: data._fee;
if (data.inputs) {
data.inputs.forEach(function(input) {
this.input(input, null);
@ -781,7 +785,7 @@ TX.prototype.maxSize = function maxSize() {
return total;
};
TX.prototype.getUnspent = function getUnspent(unspent) {
TX.prototype.getUnspent = function getUnspent(unspent, hardFee) {
var tx = this.clone();
var cost = tx.funds('out');
var fee = 1;
@ -790,48 +794,59 @@ TX.prototype.getUnspent = function getUnspent(unspent) {
var lastAdded = 0;
var size, addFee, change;
if (!hardFee)
hardFee = this._fee;
if (hardFee) {
total = cost.add(hardFee);
this._fee = hardFee;
}
function addInput(unspent) {
// Add new inputs until TX will have enough funds to cover both
// minimum post cost and fee
// Add new inputs until TX will have enough
// funds to cover both minimum post cost
// and fee.
var index = tx._input(unspent);
inputs.push(tx.inputs[index]);
lastAdded++;
return tx.funds('in').cmp(total) < 0;
}
// Transfer `total` funds maximum
// var unspent = wallet.unspent();
// Transfer `total` funds maximum.
unspent.every(addInput);
// Add dummy output (for `change`) to calculate maximum TX size
tx.output({
script: [],
value: new bn(0)
});
if (!hardFee) {
// Add dummy output (for `change`) to
// calculate maximum TX size.
tx.output({
script: [],
value: new bn(0)
});
// Change fee value if it is more than 1024 bytes
// (10000 satoshi for every 1024 bytes)
do {
// Calculate maximum possible size after signing
size = tx.maxSize();
// Change fee value if it is more than 1024
// bytes (10000 satoshi for every 1024 bytes).
do {
// Calculate max possible size after signing.
size = tx.maxSize();
addFee = Math.ceil(size / 1024) - fee;
total.iaddn(addFee * constants.tx.fee);
fee += addFee;
addFee = Math.ceil(size / 1024) - fee;
total.iaddn(addFee * constants.tx.fee);
fee += addFee;
// Failed to get enough funds, add more inputs
if (tx.funds('in').cmp(total) < 0)
unspent.slice(lastAdded).every(addInput);
} while (tx.funds('in').cmp(total) < 0 && lastAdded < unspent.length);
// Failed to get enough funds, add more inputs.
if (tx.funds('in').cmp(total) < 0)
unspent.slice(lastAdded).every(addInput);
} while (tx.funds('in').cmp(total) < 0 && lastAdded < unspent.length);
}
// Expose `total`
// Expose `total`. Useful for error messages.
this.total = total;
// Still failing to get enough funds
// Still failing to get enough funds.
if (tx.funds('in').cmp(total) < 0)
return null;
// How much money is left after sending outputs
// How much money is left after filling outputs.
change = tx.funds('in').sub(total);
// Return necessary inputs and change.
@ -844,8 +859,8 @@ TX.prototype.getUnspent = function getUnspent(unspent) {
};
};
TX.prototype.fillUnspent = function fillUnspent(unspent, changeAddress) {
var result = unspent.cost ? unspent : this.getUnspent(unspent);
TX.prototype.fillUnspent = function fillUnspent(unspent, changeAddress, fee) {
var result = this.getUnspent(unspent, fee);
if (!result)
return result;
@ -884,6 +899,9 @@ TX.prototype._recalculateFee = function recalculateFee() {
var output = this.changeOutput;
var size, real, fee;
if (this._fee)
return;
if (!output) {
this.output({
address: this.changeAddress,