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#! /usr/bin/env python3
##
## coinfetchapi - API module for coinfetch
## Copyright (C) 2015 Delwink, LLC
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU Affero General Public License as published by
## the Free Software Foundation, version 3 only.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU Affero General Public License for more details.
##
## You should have received a copy of the GNU Affero General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
##
from requests import get
from getopt import getopt
from sys import stderr
__version__ = '4.1.1'
USAGE_INFO = '''
USAGE: coinfetch [OPTIONS] [AMOUNT] FROM TO
coinfetch will print the solution for x in the following equation:
AMOUNT * FROM = x * TO
OPTIONS:
-h, --help Prints this help message.
-v, --version Outputs version information and exits.
-a, --api=Y Uses the API specified by Y.
-k, --kind=Z Gets the Z kind of exchange rate.
Supported APIs:
btce BTC-E, the default API.
bter BTer, the legacy API.
ccc CryptoCoin Charts.
Kinds:
avg Average rate, the default.
high The high rate.
low The low rate.
last The last exchange amount.
Examples:
coinfetch -k high btc usd # gets the high rate for Bitcoin to USD
coinfetch -a bter usd doge # gets the average Dogecoin to USD conversion
'''
class UsageException(Exception):
pass
def print_usage(e):
print(USAGE_INFO)
exit(int(str(e)))
def _keypair(api, r, pair):
if api in ('btce'):
return r.json()[pair]
elif api in ('bter', 'ccc'):
return r.json()
raise ValueError('API %s not supported.' %api)
def get_rate(coin_a, coin_b, amt, api, kind):
if api == 'btce':
url = 'https://btc-e.com/api/3/ticker/'
elif api == 'bter':
url = 'http://data.bter.com/api/1/ticker/'
elif api == 'ccc':
url = 'http://api.cryptocoincharts.info/tradingPair/'
if kind == 'avg':
kind = 'price'
else:
raise ValueError('kind %s not supported with API %s' %(kind, api))
else:
raise ValueError('API %s not supported.' %api)
pair = '%s_%s' %(coin_a, coin_b)
r = get(url + pair)
try:
res = _keypair(api, r, pair)
return float(res[kind]) * amt
except (KeyError, TypeError):
try:
pair = '%s_%s' %(coin_b, coin_a)
r = get(url + pair)
res = _keypair(api, r, pair)
return (float(res[kind]) ** -1) * amt
except TypeError as e:
raise ValueError('currency pair not found: %s' %str(e))
def coinfetch(args):
api = 'btce'
kind = 'avg'
opts, args = getopt(args, "hva:k:", ['help', 'version', 'api=', 'kind='])
for key, value in opts:
if key in ('-h', '--help'):
raise UsageException(0)
elif key in ('-v', '--version'):
print('''coinfetch 4.1.1
Copyright (C) 2015 Delwink, LLC
License AGPLv3: GNU AGPL version 3 only <http://gnu.org/licenses/agpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by David McMackins II''')
exit(0)
elif key in ('-a', '--api'):
api = value
elif key in ('-k', '--kind'):
kind = value
bump = 1 if len(args) == 3 else 0
amt = float(args[0]) if len(args) == 3 else 1.0
try:
print('%.8f' %get_rate(args[bump], args[1+bump], amt, api, kind))
except IndexError:
raise UsageException(1)
except KeyError as e:
print('coinfetch: currency pair not found: %s' %str(e), file=stderr)
exit(2)
except ValueError as e:
print('coinfetch: %s' %str(e), file=stderr)
exit(3)
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