Add fee estimation functions for dogecoin and litecoin
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3 changed files with 106 additions and 21 deletions
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@ -1,10 +1,6 @@
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// https://en.bitcoin.it/wiki/List_of_address_prefixes
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// https://en.bitcoin.it/wiki/List_of_address_prefixes
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// Dogecoin BIP32 is a proposed standard: https://bitcointalk.org/index.php?topic=409731
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// Dogecoin BIP32 is a proposed standard: https://bitcointalk.org/index.php?topic=409731
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function bitcoinEstimateFee(txByteSize) {
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return networks.bitcoin.feePerKb * Math.ceil(txByteSize / 1000)
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}
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var networks = {
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var networks = {
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bitcoin: {
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bitcoin: {
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magicPrefix: '\x18Bitcoin Signed Message:\n',
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magicPrefix: '\x18Bitcoin Signed Message:\n',
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@ -15,9 +11,9 @@ var networks = {
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pubKeyHash: 0x00,
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pubKeyHash: 0x00,
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scriptHash: 0x05,
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scriptHash: 0x05,
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wif: 0x80,
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wif: 0x80,
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dustThreshold: 546, // https://github.com/bitcoin/bitcoin/blob/529047fcd18acd1b64dc95d6eb69edeaad75d405/src/core.h#L176-L188
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dustThreshold: 546,
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feePerKb: 10000, // https://github.com/bitcoin/bitcoin/blob/3f39b9d4551d729c3a2e4decd810ac6887cfaeb3/src/main.cpp#L52
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feePerKb: 10000,
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estimateFee: bitcoinEstimateFee
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estimateFee: estimateFee('bitcoin')
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},
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},
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dogecoin: {
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dogecoin: {
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magicPrefix: '\x19Dogecoin Signed Message:\n',
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magicPrefix: '\x19Dogecoin Signed Message:\n',
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@ -29,7 +25,9 @@ var networks = {
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scriptHash: 0x16,
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scriptHash: 0x16,
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wif: 0x9e,
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wif: 0x9e,
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dustThreshold: 0,
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dustThreshold: 0,
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feePerKb: 100000000
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dustSoftThreshold: 100000000,
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feePerKb: 100000000,
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estimateFee: estimateFee('dogecoin')
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},
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},
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litecoin: {
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litecoin: {
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magicPrefix: '\x19Litecoin Signed Message:\n',
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magicPrefix: '\x19Litecoin Signed Message:\n',
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@ -41,7 +39,9 @@ var networks = {
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scriptHash: 0x05,
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scriptHash: 0x05,
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wif: 0xb0,
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wif: 0xb0,
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dustThreshold: 0,
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dustThreshold: 0,
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feePerKb: 100000
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dustSoftThreshold: 100000,
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feePerKb: 100000,
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estimateFee: estimateFee('litecoin')
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},
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},
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testnet: {
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testnet: {
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magicPrefix: '\x18Bitcoin Signed Message:\n',
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magicPrefix: '\x18Bitcoin Signed Message:\n',
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@ -54,7 +54,27 @@ var networks = {
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wif: 0xef,
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wif: 0xef,
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dustThreshold: 546,
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dustThreshold: 546,
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feePerKb: 10000,
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feePerKb: 10000,
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estimateFee: bitcoinEstimateFee
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estimateFee: estimateFee('bitcoin')
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}
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}
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}
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}
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function estimateFee(type) {
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return function(tx) {
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var network = networks[type]
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var baseFee = network.feePerKb
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var byteSize = tx.toBuffer().length
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var fee = baseFee * Math.ceil(byteSize / 1000)
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if(network.dustSoftThreshold == undefined) return fee
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tx.outs.forEach(function(e){
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if(e.value < network.dustSoftThreshold) {
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fee += baseFee
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}
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})
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return fee
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}
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}
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module.exports = networks
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module.exports = networks
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@ -236,8 +236,7 @@ function Wallet(seed, network) {
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var tmpTx = tx.clone()
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var tmpTx = tx.clone()
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tmpTx.addOutput(getChangeAddress(), 0)
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tmpTx.addOutput(getChangeAddress(), 0)
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var byteSize = tmpTx.toBuffer().length
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return network.estimateFee(tmpTx)
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return network.estimateFee(byteSize)
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}
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}
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function getChangeAddress() {
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function getChangeAddress() {
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@ -6,18 +6,84 @@ var fixtureTxes = require('./fixtures/mainnet_tx')
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var fixtureTx1Hex = fixtureTxes.prevTx
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var fixtureTx1Hex = fixtureTxes.prevTx
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var fixtureTxBigHex = fixtureTxes.bigTx
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var fixtureTxBigHex = fixtureTxes.bigTx
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describe('bitcoin', function() {
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describe('networks', function() {
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describe('estimateFee', function() {
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describe('bitcoin', function() {
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var estimateFee = networks.bitcoin.estimateFee
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describe('estimateFee', function() {
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var estimateFee = networks.bitcoin.estimateFee
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it('works for fixture tx 1', function() {
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it('works for fixture tx 1', function() {
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var tx = Transaction.fromHex(fixtureTx1Hex)
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var tx = Transaction.fromHex(fixtureTx1Hex)
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assert.equal(estimateFee(tx.toBuffer().length), 10000)
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assert.equal(estimateFee(tx), 10000)
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})
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it('works for fixture big tx', function() {
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var tx = Transaction.fromHex(fixtureTxBigHex)
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assert.equal(estimateFee(tx), 30000)
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})
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})
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})
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})
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it('works for fixture big tx', function() {
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describe('dogecoin', function() {
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var tx = Transaction.fromHex(fixtureTxBigHex)
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describe('estimateFee', function() {
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assert.equal(estimateFee(tx.toBuffer().length), 30000)
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var estimateFee = networks.dogecoin.estimateFee
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it('regular fee per kb applies when every output has value no less than DUST_SOFT_LIMIT', function() {
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var tx = Transaction.fromHex(fixtureTx1Hex)
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tx.outs.forEach(function(e){
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e.value = 100000000
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})
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assert.equal(estimateFee(tx), 100000000)
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})
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it('applies additional fee on every output with value below DUST_SOFT_LIMIT', function() {
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var tx = Transaction.fromHex(fixtureTx1Hex)
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tx.outs.forEach(function(e){
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e.value = 99999999
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})
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assert.equal(estimateFee(tx), 4 * 100000000) // 3 outs in total
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})
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it('works for fixture big tx', function() {
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var tx = Transaction.fromHex(fixtureTxBigHex)
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tx.outs.forEach(function(e){
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e.value = 100000000
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})
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assert.equal(estimateFee(tx), 300000000)
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})
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})
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})
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describe('litecoin', function() {
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describe('estimateFee', function() {
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var estimateFee = networks.litecoin.estimateFee
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it('regular fee per kb applies when every output has value no less than DUST_SOFT_LIMIT', function() {
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var tx = Transaction.fromHex(fixtureTx1Hex)
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tx.outs.forEach(function(e){
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e.value = 100000
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})
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assert.equal(estimateFee(tx), 100000)
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})
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it('applies additional fee on every output with value below DUST_SOFT_LIMIT', function() {
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var tx = Transaction.fromHex(fixtureTx1Hex)
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tx.outs.forEach(function(e){
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e.value = 99999
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})
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assert.equal(estimateFee(tx), 4 * 100000) // 3 outs in total
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})
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it('works for fixture big tx', function() {
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var tx = Transaction.fromHex(fixtureTxBigHex)
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tx.outs.forEach(function(e){
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e.value = 100000
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})
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assert.equal(estimateFee(tx), 300000)
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})
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})
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})
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})
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})
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})
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})
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