# Pyledger. A simple ledger for smart contracts implemented in Python
# Copyright (C) 2017 Guillem Borrell Nogueras
#
# 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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 pyledger.server import run
from pyledger.server.contract import SimpleContract
class Hello(SimpleContract):
counter = 0
def say_hello(self, name: str):
self.counter += 1
return 'Hello {} # {}'.format(name, self.counter)
run(Hello)
return key
def increment(self, key: str, quantity: float):
if key not in self.accounts:
raise Exception('Account not found')
self.accounts[key] += quantity
def transfer(self, source: str, dest: str, quantity: float):
if source not in self.accounts:
raise Exception('Source account not found')
if dest not in self.accounts:
raise Exception('Destination account not found')
if self.accounts[source] < quantity:
raise Exception('Not enough funds in source account')
if quantity < 0:
raise Exception('You cannot transfer negative currency')
self.accounts[source] -= quantity
self.accounts[dest] += quantity
def balance(self, key: str):
if key not in self.accounts:
print(self.accounts)
raise Exception('Account not found')
return str(self.accounts[key])
run(DigitalCurrency)