tcomputation of capital gains for outgoing transactions - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
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---
DIR commit 42a16d9c3e19785ad39f272517aa2ce54b9e0f7f
DIR parent c32435c15e99ff952a309548dfafacd68a434adb
HTML Author: ThomasV <thomasv@electrum.org>
Date: Sat, 6 Jan 2018 12:57:04 +0100
computation of capital gains for outgoing transactions
Diffstat:
M gui/qt/history_list.py | 5 +++++
M lib/exchange_rate.py | 5 +++++
M lib/wallet.py | 42 +++++++++++++++++++++++++++++++
3 files changed, 52 insertions(+), 0 deletions(-)
---
DIR diff --git a/gui/qt/history_list.py b/gui/qt/history_list.py
t@@ -62,6 +62,7 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
fx = self.parent.fx
if fx and fx.show_history():
headers.extend(['%s '%fx.ccy + _('Amount'), '%s '%fx.ccy + _('Balance')])
+ headers.extend(['%s '%fx.ccy + _('Capital Gains')])
self.update_headers(headers)
def get_domain(self):
t@@ -91,6 +92,10 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
for amount in [value, balance]:
text = fx.historical_value_str(amount, date)
entry.append(text)
+ # fixme: should use is_mine
+ if value < 0:
+ cg = self.wallet.capital_gain(tx_hash, self.parent.fx.timestamp_rate)
+ entry.append("%.2f"%cg if cg is not None else _('No data'))
item = QTreeWidgetItem(entry)
item.setIcon(0, icon)
item.setToolTip(0, str(conf) + " confirmation" + ("s" if conf != 1 else ""))
DIR diff --git a/lib/exchange_rate.py b/lib/exchange_rate.py
t@@ -493,3 +493,8 @@ class FxThread(ThreadJob):
def historical_value_str(self, satoshis, d_t):
rate = self.history_rate(d_t)
return self.value_str(satoshis, rate)
+
+ def timestamp_rate(self, timestamp):
+ from electrum.util import timestamp_to_datetime
+ date = timestamp_to_datetime(timestamp)
+ return self.history_rate(date)
DIR diff --git a/lib/wallet.py b/lib/wallet.py
t@@ -962,6 +962,8 @@ class Abstract_Wallet(PrintError):
date = timestamp_to_datetime(time.time() if conf <= 0 else timestamp)
item['fiat_value'] = fx.historical_value_str(value, date)
item['fiat_balance'] = fx.historical_value_str(balance, date)
+ if value < 0:
+ item['capital_gain'] = self.capital_gain(tx_hash, fx.timestamp_rate)
out.append(item)
return out
t@@ -1586,6 +1588,46 @@ class Abstract_Wallet(PrintError):
children |= self.get_depending_transactions(other_hash)
return children
+ def txin_value(self, txin):
+ txid = txin['prevout_hash']
+ prev_n = txin['prevout_n']
+ for address, d in self.txo[txid].items():
+ for n, v, cb in d:
+ if n == prev_n:
+ return v
+ raise BaseException('unknown txin value')
+
+ def capital_gain(self, txid, price_func):
+ """
+ Difference between the fiat price of coins leaving the wallet because of transaction txid,
+ and the price of these coins when they entered the wallet.
+ price_func: function that returns the fiat price given a timestamp
+ """
+ height, conf, timestamp = self.get_tx_height(txid)
+ tx = self.transactions[txid]
+ out_value = sum([ (value if not self.is_mine(address) else 0) for otype, address, value in tx.outputs() ])
+ try:
+ return out_value/1e8 * (price_func(timestamp) - self.average_price(tx, price_func))
+ except:
+ return None
+
+ def average_price(self, tx, price_func):
+ """ average price of the inputs of a transaction """
+ return sum(self.coin_price(txin, price_func) * self.txin_value(txin) for txin in tx.inputs()) / sum(self.txin_value(txin) for txin in tx.inputs())
+
+ def coin_price(self, coin, price_func):
+ """ fiat price of acquisition of coin """
+ txid = coin['prevout_hash']
+ tx = self.transactions[txid]
+ if all([self.is_mine(txin['address']) for txin in tx.inputs()]):
+ return self.average_price(tx, price_func)
+ elif all([ not self.is_mine(txin['address']) for txin in tx.inputs()]):
+ height, conf, timestamp = self.get_tx_height(txid)
+ return price_func(timestamp)
+ else:
+ # could be some coinjoin transaction..
+ return None
+
class Simple_Wallet(Abstract_Wallet):
# wallet with a single keystore