computation of capital gains for outgoing transactions
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c32435c15e
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@ -62,6 +62,7 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
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fx = self.parent.fx
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if fx and fx.show_history():
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headers.extend(['%s '%fx.ccy + _('Amount'), '%s '%fx.ccy + _('Balance')])
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headers.extend(['%s '%fx.ccy + _('Capital Gains')])
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self.update_headers(headers)
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def get_domain(self):
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@ -91,6 +92,10 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
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for amount in [value, balance]:
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text = fx.historical_value_str(amount, date)
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entry.append(text)
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# fixme: should use is_mine
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if value < 0:
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cg = self.wallet.capital_gain(tx_hash, self.parent.fx.timestamp_rate)
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entry.append("%.2f"%cg if cg is not None else _('No data'))
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item = QTreeWidgetItem(entry)
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item.setIcon(0, icon)
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item.setToolTip(0, str(conf) + " confirmation" + ("s" if conf != 1 else ""))
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@ -493,3 +493,8 @@ class FxThread(ThreadJob):
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def historical_value_str(self, satoshis, d_t):
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rate = self.history_rate(d_t)
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return self.value_str(satoshis, rate)
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def timestamp_rate(self, timestamp):
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from electrum.util import timestamp_to_datetime
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date = timestamp_to_datetime(timestamp)
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return self.history_rate(date)
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@ -962,6 +962,8 @@ class Abstract_Wallet(PrintError):
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date = timestamp_to_datetime(time.time() if conf <= 0 else timestamp)
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item['fiat_value'] = fx.historical_value_str(value, date)
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item['fiat_balance'] = fx.historical_value_str(balance, date)
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if value < 0:
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item['capital_gain'] = self.capital_gain(tx_hash, fx.timestamp_rate)
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out.append(item)
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return out
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@ -1586,6 +1588,46 @@ class Abstract_Wallet(PrintError):
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children |= self.get_depending_transactions(other_hash)
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return children
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def txin_value(self, txin):
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txid = txin['prevout_hash']
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prev_n = txin['prevout_n']
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for address, d in self.txo[txid].items():
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for n, v, cb in d:
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if n == prev_n:
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return v
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raise BaseException('unknown txin value')
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def capital_gain(self, txid, price_func):
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"""
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Difference between the fiat price of coins leaving the wallet because of transaction txid,
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and the price of these coins when they entered the wallet.
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price_func: function that returns the fiat price given a timestamp
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"""
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height, conf, timestamp = self.get_tx_height(txid)
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tx = self.transactions[txid]
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out_value = sum([ (value if not self.is_mine(address) else 0) for otype, address, value in tx.outputs() ])
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try:
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return out_value/1e8 * (price_func(timestamp) - self.average_price(tx, price_func))
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except:
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return None
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def average_price(self, tx, price_func):
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""" average price of the inputs of a transaction """
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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())
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def coin_price(self, coin, price_func):
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""" fiat price of acquisition of coin """
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txid = coin['prevout_hash']
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tx = self.transactions[txid]
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if all([self.is_mine(txin['address']) for txin in tx.inputs()]):
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return self.average_price(tx, price_func)
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elif all([ not self.is_mine(txin['address']) for txin in tx.inputs()]):
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height, conf, timestamp = self.get_tx_height(txid)
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return price_func(timestamp)
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else:
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# could be some coinjoin transaction..
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return None
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class Simple_Wallet(Abstract_Wallet):
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# wallet with a single keystore
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