278 lines
8.1 KiB
Python
278 lines
8.1 KiB
Python
import sys
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import subprocess
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import logging
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import time
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from datetime import datetime
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from xml.etree import ElementTree
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from contextlib import contextmanager
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_log = logging.getLogger(__name__)
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class Ledger:
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def __init__(self, ledger_file=None, ledger_bin=None):
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if ledger_file is None:
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raise ValueError('ledger_file cannot be None')
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self.ledger_bin = ledger_bin or 'ledger'
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self.ledger_file = ledger_file
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_log.info('ledger file: %s', ledger_file)
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self.locked = False
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self.ledger_process = None
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@contextmanager
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def locked_process(self):
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if self.locked:
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raise RuntimeError('The process has already been locked,'
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' something\'s out of order.')
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# XXX: This code has no purpose in a single-threaded process
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timeout = 5 # Seconds
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for i in range(1, timeout + 2):
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if i > timeout:
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raise RuntimeError('Ledger process is already locked')
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if not self.locked:
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break
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else:
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_log.info('Waiting for one second... %d/%d', i, timeout)
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time.sleep(1)
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process = self.get_process()
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self.locked = True
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_log.debug('Lock enabled')
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yield process
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self.locked = False
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_log.debug('Lock disabled')
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def assemble_arguments(self):
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return [
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self.ledger_bin,
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'-f',
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self.ledger_file,
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]
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def init_process(self):
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_log.debug('Starting ledger process...')
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self.ledger_process = subprocess.Popen(
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self.assemble_arguments(),
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stdout=subprocess.PIPE,
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stdin=subprocess.PIPE,
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stderr=subprocess.PIPE)
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# Swallow the banner
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with self.locked_process() as p:
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self.read_until_prompt(p)
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return self.ledger_process
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def get_process(self):
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return self.ledger_process or self.init_process()
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def read_until_prompt(self, p):
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output = b''
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while True:
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line = p.stdout.read(1) # XXX: This is a hack
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output += line
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if b'\n] ' in output:
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_log.debug('Found prompt!')
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break
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output = output[:-3] # Cut away the prompt
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_log.debug('output: %s', output)
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return output
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def send_command(self, command):
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output = None
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with self.locked_process() as p:
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if isinstance(command, str):
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command = command.encode('utf8')
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p.stdin.write(command + b'\n')
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p.stdin.flush()
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output = self.read_until_prompt(p)
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self.ledger_process.send_signal(subprocess.signal.SIGTERM)
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_log.debug('Waiting for ledger to shut down')
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self.ledger_process.wait()
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self.ledger_process = None
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return output
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def add_transaction(self, transaction):
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transaction_template = ('\n{date} {t.payee}\n'
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'{postings}')
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posting_template = (' {account} {p.amount.symbol}'
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' {p.amount.amount}\n')
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output = b''
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output += transaction_template.format(
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date=transaction.date.strftime('%Y-%m-%d'),
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t=transaction,
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postings=''.join([posting_template.format(
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p=p,
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account=p.account + ' ' * (
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80 - (len(p.account) + len(p.amount.symbol) +
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len(p.amount.amount) + 1 + 2)
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)) for p in transaction.postings])).encode('utf8')
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with open(self.ledger_file, 'ab') as f:
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f.write(output)
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_log.debug('written to file: %s', output)
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def bal(self):
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output = self.send_command('xml')
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if output is None:
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raise RuntimeError('bal call returned no output')
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accounts = []
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xml = ElementTree.fromstring(output.decode('utf8'))
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accounts = self._recurse_accounts(xml.find('./accounts'))
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return accounts
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def _recurse_accounts(self, root):
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accounts = []
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for account in root.findall('./account'):
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name = account.find('./fullname').text
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amounts = []
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# Try to find an account total value, then try to find the account
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# balance
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account_amounts = account.findall(
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'./account-total/balance/amount') or \
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account.findall('./account-amount/amount') or \
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account.findall('./account-total/amount')
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if account_amounts:
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for amount in account_amounts:
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quantity = amount.find('./quantity').text
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symbol = amount.find('./commodity/symbol').text
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amounts.append(Amount(amount=quantity, symbol=symbol))
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else:
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_log.warning('Account %s does not have any amounts', name)
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accounts.append(Account(name=name,
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amounts=amounts,
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accounts=self._recurse_accounts(account)))
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return accounts
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def reg(self):
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output = self.send_command('xml')
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if output is None:
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raise RuntimeError('reg call returned no output')
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entries = []
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reg_xml = ElementTree.fromstring(output.decode('utf8'))
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for transaction in reg_xml.findall('./transactions/transaction'):
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date = datetime.strptime(transaction.find('./date').text,
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'%Y/%m/%d')
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payee = transaction.find('./payee').text
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postings = []
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for posting in transaction.findall('./postings/posting'):
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account = posting.find('./account/name').text
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amount = posting.find('./post-amount/amount/quantity').text
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symbol = posting.find(
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'./post-amount/amount/commodity/symbol').text
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postings.append(
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Posting(account=account,
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amount=Amount(amount=amount, symbol=symbol)))
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entries.append(
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Transaction(date=date, payee=payee, postings=postings))
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return entries
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class Transaction:
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def __init__(self, date=None, payee=None, postings=None):
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self.date = date
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self.payee = payee
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self.postings = postings
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def __repr__(self):
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return ('<{self.__class__.__name__} {date}' +
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' {self.payee} {self.postings}').format(
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self=self,
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date=self.date.strftime('%Y-%m-%d'))
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class Posting:
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def __init__(self, account=None, amount=None):
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self.account = account
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self.amount = amount
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def __repr__(self):
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return ('<{self.__class__.__name__} "{self.account}"' +
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' {self.amount}>').format(self=self)
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class Amount:
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def __init__(self, amount=None, symbol=None):
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self.amount = amount
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self.symbol = symbol
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def __repr__(self):
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return ('<{self.__class__.__name__} {self.symbol}' +
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' {self.amount}>').format(self=self)
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class Account:
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def __init__(self, name=None, amounts=None, accounts=None):
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self.name = name
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self.amounts = amounts
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self.accounts = accounts
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def __repr__(self):
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return ('<{self.__class__.__name__} "{self.name}" {self.amounts}' +
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' {self.accounts}>').format(self=self)
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def main(argv=None):
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import argparse
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if argv is None:
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argv = sys.argv
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parser = argparse.ArgumentParser()
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parser.add_argument('-v', '--verbosity',
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default='INFO',
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help=('Filter logging output. Possible values:' +
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' CRITICAL, ERROR, WARNING, INFO, DEBUG'))
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args = parser.parse_args(argv[1:])
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logging.basicConfig(level=getattr(logging, args.verbosity, 'INFO'))
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ledger = Ledger(ledger_file='non-profit-test-data.ledger')
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print(ledger.bal())
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print(ledger.reg())
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if __name__ == '__main__':
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sys.exit(main())
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