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allow fractional feerates (#4324)

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ghost43 2018-05-09 19:30:18 +02:00 committed by GitHub
parent 3337af0734
commit dae187bada
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 52 additions and 22 deletions
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31
gui/qt/amountedit.py
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@ -1,11 +1,12 @@
# -*- coding: utf-8 -*-
from decimal import Decimal
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import (QLineEdit, QStyle, QStyleOptionFrame)
from decimal import Decimal
from electrum.util import format_satoshis_plain, decimal_point_to_base_unit_name
from electrum.util import format_satoshis_plain, decimal_point_to_base_unit_name, FEERATE_PRECISION
class MyLineEdit(QLineEdit):
@ -19,7 +20,7 @@ class MyLineEdit(QLineEdit):
class AmountEdit(MyLineEdit):
shortcut = pyqtSignal()
def __init__(self, base_unit, is_int = False, parent=None):
def __init__(self, base_unit, is_int=False, parent=None):
QLineEdit.__init__(self, parent)
# This seems sufficient for hundred-BTC amounts with 8 decimals
self.setFixedWidth(140)
@ -28,10 +29,14 @@ class AmountEdit(MyLineEdit):
self.is_int = is_int
self.is_shortcut = False
self.help_palette = QPalette()
self.extra_precision = 0
def decimal_point(self):
return 8
def max_precision(self):
return self.decimal_point() + self.extra_precision
def numbify(self):
text = self.text().strip()
if text == '!':
@ -45,7 +50,7 @@ class AmountEdit(MyLineEdit):
if '.' in s:
p = s.find('.')
s = s.replace('.','')
s = s[:p] + '.' + s[p:p+self.decimal_point()]
s = s[:p] + '.' + s[p:p+self.max_precision()]
self.setText(s)
# setText sets Modified to False. Instead we want to remember
# if updates were because of user modification.
@ -75,7 +80,7 @@ class AmountEdit(MyLineEdit):
class BTCAmountEdit(AmountEdit):
def __init__(self, decimal_point, is_int = False, parent=None):
def __init__(self, decimal_point, is_int=False, parent=None):
AmountEdit.__init__(self, self._base_unit, is_int, parent)
self.decimal_point = decimal_point
@ -87,8 +92,15 @@ class BTCAmountEdit(AmountEdit):
x = Decimal(str(self.text()))
except:
return None
p = pow(10, self.decimal_point())
return int( p * x )
# scale it to max allowed precision, make it an int
power = pow(10, self.max_precision())
max_prec_amount = int(power * x)
# if the max precision is simply what unit conversion allows, just return
if self.max_precision() == self.decimal_point():
return max_prec_amount
# otherwise, scale it back to the expected unit
amount = Decimal(max_prec_amount) / pow(10, self.max_precision()-self.decimal_point())
return Decimal(amount) if not self.is_int else int(amount)
def setAmount(self, amount):
if amount is None:
@ -98,6 +110,11 @@ class BTCAmountEdit(AmountEdit):
class FeerateEdit(BTCAmountEdit):
def __init__(self, decimal_point, is_int=False, parent=None):
super().__init__(decimal_point, is_int, parent)
self.extra_precision = FEERATE_PRECISION
def _base_unit(self):
return 'sat/byte'

17
gui/qt/main_window.py
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@ -49,7 +49,7 @@ from electrum.util import (format_time, format_satoshis, format_fee_satoshis,
UserCancelled, NoDynamicFeeEstimates, profiler,
export_meta, import_meta, bh2u, bfh, InvalidPassword,
base_units, base_units_list, base_unit_name_to_decimal_point,
decimal_point_to_base_unit_name)
decimal_point_to_base_unit_name, quantize_feerate)
from electrum import Transaction
from electrum import util, bitcoin, commands, coinchooser
from electrum import paymentrequest
@ -1102,7 +1102,8 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
self.config.set_key('fee_per_kb', fee_rate, False)
if fee_rate:
self.feerate_e.setAmount(fee_rate // 1000)
fee_rate = Decimal(fee_rate)
self.feerate_e.setAmount(quantize_feerate(fee_rate / 1000))
else:
self.feerate_e.setAmount(None)
self.fee_e.setModified(False)
@ -1334,12 +1335,12 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
if freeze_feerate or self.fee_slider.is_active():
displayed_feerate = self.feerate_e.get_amount()
if displayed_feerate:
displayed_feerate = displayed_feerate // 1000
displayed_feerate = quantize_feerate(displayed_feerate / 1000)
else:
# fallback to actual fee
displayed_feerate = fee // size if fee is not None else None
displayed_feerate = quantize_feerate(fee / size) if fee is not None else None
self.feerate_e.setAmount(displayed_feerate)
displayed_fee = displayed_feerate * size if displayed_feerate is not None else None
displayed_fee = round(displayed_feerate * size) if displayed_feerate is not None else None
self.fee_e.setAmount(displayed_fee)
else:
if freeze_fee:
@ -1349,14 +1350,14 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
displayed_fee = fee
self.fee_e.setAmount(displayed_fee)
displayed_fee = displayed_fee if displayed_fee else 0
displayed_feerate = displayed_fee // size if displayed_fee is not None else None
displayed_feerate = quantize_feerate(displayed_fee / size) if displayed_fee is not None else None
self.feerate_e.setAmount(displayed_feerate)
# show/hide fee rounding icon
feerounding = (fee - displayed_fee) if fee else 0
self.set_feerounding_text(feerounding)
self.set_feerounding_text(int(feerounding))
self.feerounding_icon.setToolTip(self.feerounding_text)
self.feerounding_icon.setVisible(bool(feerounding))
self.feerounding_icon.setVisible(abs(feerounding) >= 1)
if self.is_max:
amount = tx.output_value()

10
lib/simple_config.py
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@ -3,6 +3,7 @@ import threading
import time
import os
import stat
from decimal import Decimal
from copy import deepcopy
@ -473,12 +474,9 @@ class SimpleConfig(PrintError):
@classmethod
def estimate_fee_for_feerate(cls, fee_per_kb, size):
# note: We only allow integer sat/byte values atm.
# The GUI for simplicity reasons only displays integer sat/byte,
# and for the sake of consistency, we thus only use integer sat/byte in
# the backend too.
fee_per_byte = int(fee_per_kb / 1000)
return int(fee_per_byte * size)
fee_per_kb = Decimal(fee_per_kb)
fee_per_byte = fee_per_kb / 1000
return round(fee_per_byte * size)
def update_fee_estimates(self, key, value):
self.fee_estimates[key] = value

16
lib/util.py
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@ -24,6 +24,7 @@ import binascii
import os, sys, re, json
from collections import defaultdict
from datetime import datetime
import decimal
from decimal import Decimal
import traceback
import urllib
@ -472,8 +473,21 @@ def format_satoshis(x, num_zeros=0, decimal_point=8, precision=None, is_diff=Fal
result = " " * (15 - len(result)) + result
return result
FEERATE_PRECISION = 1 # num fractional decimal places for sat/byte fee rates
_feerate_quanta = Decimal(10) ** (-FEERATE_PRECISION)
def format_fee_satoshis(fee, num_zeros=0):
return format_satoshis(fee, num_zeros, 0, precision=1)
return format_satoshis(fee, num_zeros, 0, precision=FEERATE_PRECISION)
def quantize_feerate(fee):
"""Strip sat/byte fee rate of excess precision."""
if fee is None:
return None
return Decimal(fee).quantize(_feerate_quanta, rounding=decimal.ROUND_HALF_DOWN)
def timestamp_to_datetime(timestamp):
if timestamp is None: