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compute capital gains using wallet.txi and txo

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ThomasV 2018-02-21 14:29:39 +01:00
parent e7c3712181
commit 51f04d4e7b
1 changed files with 32 additions and 27 deletions
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59
lib/wallet.py
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@ -503,6 +503,17 @@ class Abstract_Wallet(PrintError):
delta += v
return delta
def get_tx_value(self, txid):
" effect of tx on the entire domain"
delta = 0
for addr, d in self.txi.get(txid, {}).items():
for n, v in d:
delta -= v
for addr, d in self.txo.get(txid, {}).items():
for n, v, cb in d:
delta += v
return delta
def get_wallet_delta(self, tx):
""" effect of tx on wallet """
addresses = self.get_addresses()
@ -1694,7 +1705,7 @@ class Abstract_Wallet(PrintError):
coins = self.get_utxos(domain)
now = time.time()
p = price_func(now)
ap = sum(self.coin_price(coin, price_func, ccy, self.txin_value(coin)) for coin in coins)
ap = sum(self.coin_price(coin['prevout_hash'], price_func, ccy, self.txin_value(coin)) for coin in coins)
lp = sum([coin['value'] for coin in coins]) * p / Decimal(COIN)
return lp - ap
@ -1704,42 +1715,36 @@ class Abstract_Wallet(PrintError):
and the price of these coins when they entered the wallet.
price_func: function that returns the fiat price given a timestamp
"""
tx = self.transactions[txid]
ir, im, v, fee = self.get_wallet_delta(tx)
out_value = -v
out_value = - self.get_tx_value(txid)/Decimal(COIN)
fiat_value = self.get_fiat_value(txid, ccy)
if fiat_value is None:
p = self.price_at_timestamp(txid, price_func)
liquidation_price = out_value/Decimal(COIN) * p
else:
liquidation_price = - fiat_value
acquisition_price = out_value/Decimal(COIN) * self.average_price(tx, price_func, ccy)
liquidation_price = - fiat_value if fiat_value else out_value * self.price_at_timestamp(txid, price_func)
acquisition_price = out_value * self.average_price(txid, price_func, ccy)
return acquisition_price, liquidation_price
def average_price(self, tx, price_func, ccy):
""" average price of the inputs of a transaction """
input_value = sum(self.txin_value(txin) for txin in tx.inputs()) / Decimal(COIN)
total_price = sum(self.coin_price(txin, price_func, ccy, self.txin_value(txin)) for txin in tx.inputs())
return total_price / input_value
def average_price(self, txid, price_func, ccy):
""" Average acquisition price of the inputs of a transaction """
input_value = 0
total_price = 0
for addr, d in self.txi.get(txid, {}).items():
for ser, v in d:
input_value += v
total_price += self.coin_price(ser.split(':')[0], price_func, ccy, v)
return total_price / (input_value/Decimal(COIN))
def coin_price(self, coin, price_func, ccy, txin_value):
""" 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, ccy) * txin_value/Decimal(COIN)
elif all([ not self.is_mine(txin['address']) for txin in tx.inputs()]):
def coin_price(self, txid, price_func, ccy, txin_value):
"""
Acquisition price of a coin.
This assumes that either all inputs are mine, or no input is mine.
"""
if self.txi.get(txid, {}) != {}:
return self.average_price(txid, price_func, ccy) * txin_value/Decimal(COIN)
else:
fiat_value = self.get_fiat_value(txid, ccy)
if fiat_value is not None:
return fiat_value
else:
p = self.price_at_timestamp(txid, price_func)
return p * txin_value/Decimal(COIN)
else:
# could be some coinjoin transaction..
return Decimal('NaN')
class Simple_Wallet(Abstract_Wallet):
# wallet with a single keystore