fcec13c548
- Switched to passing the command via argv instead of stdin to ledger. We might as well as we don't use ledger's long-running mode in an effective manner. - Added version control of the ledger file using pygit2.A - Added error handling in the case of an unbalanced ledger, and cruder error handling in the case of any stderr output from ledger. - [web] Separated transaction_get into transaction_get and transaction_get_all.
441 lines
14 KiB
Python
441 lines
14 KiB
Python
# Part of accounting-api project:
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# https://gitorious.org/conservancy/accounting-api
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# License: AGPLv3-or-later
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import os
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import sys
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import subprocess
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import logging
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import time
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import re
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import pygit2
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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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from accounting.exceptions import AccountingException, TransactionNotFound, \
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LedgerNotBalanced, TransactionIDCollision
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from accounting.models import Account, Transaction, Posting, Amount
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from accounting.storage import Storage
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_log = logging.getLogger(__name__)
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class Ledger(Storage):
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def __init__(self, app=None, ledger_file=None, ledger_bin=None):
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if app:
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ledger_file = app.config['LEDGER_FILE']
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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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try:
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self.repository = pygit2.Repository(
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os.path.join(os.path.dirname(self.ledger_file), '.git'))
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except KeyError:
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self.repository = None
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_log.warning('ledger_file directory does not contain a .git'
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' directory, will not track changes.')
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# The signature used as author and committer in git commits
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self.signature = pygit2.Signature(
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name='accounting-api',
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email='accounting-api@accounting.example')
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def commit_changes(self, message):
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'''
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Commits any changes to :attr:`self.ledger_file` to the git repository
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'''
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if self.repository is None:
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return
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# Add the ledger file
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self.repository.index.read()
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self.repository.index.add(os.path.basename(self.ledger_file))
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tree_id = self.repository.index.write_tree()
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self.repository.index.write()
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parents = []
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try:
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parents.append(self.repository.head.target)
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except pygit2.GitError:
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_log.info('Repository has no head, creating initial commit')
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commit_id = self.repository.create_commit(
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'HEAD',
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self.signature,
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self.signature,
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message,
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tree_id,
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parents)
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def assemble_arguments(self, command=None):
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'''
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Returns a list of arguments suitable for :class:`subprocess.Popen`
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based on :attr:`self.ledger_bin` and :attr:`self.ledger_file`.
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'''
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args = [
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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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if command is not None:
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args.append(command)
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return args
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def send_command(self, command):
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'''
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Creates a new ledger process with the specified :data:`command` and
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returns the output.
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Raises an :class:`~accounting.exceptions.AccountingException`-based
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Exception based on the ledger-cli stderr.
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'''
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_log.debug('Sending command: %r', command)
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_log.debug('Starting ledger...')
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p = subprocess.Popen(
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self.assemble_arguments(command=command),
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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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output = p.stdout.read()
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stderr = p.stderr.read().decode('utf8')
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if stderr:
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lines = stderr.split('\n')
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if 'While balancing transaction from' in lines[1]:
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raise LedgerNotBalanced('\n'.join(lines[2:]))
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raise AccountingException(stderr)
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p.send_signal(subprocess.signal.SIGTERM)
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_log.debug('Waiting for ledger to shut down')
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p.wait()
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return output
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def add_transaction(self, transaction):
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'''
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Writes a transaction to the ledger file by opening it in 'ab' mode and
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writing a ledger transaction based on the
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:class:`~accounting.models.Transaction` instance in
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:data:`transaction`.
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'''
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if transaction.id is None:
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_log.debug('No ID found. Generating an ID.')
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transaction.generate_id()
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exists = self.get_transaction(transaction.id)
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if exists is not None:
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raise TransactionIDCollision(
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'A transaction with the id %s already exists: %s' %
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(transaction.id, exists))
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transaction.metadata.update({'Id': transaction.id})
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transaction_template = ('\n{date} {t.payee}\n'
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'{metadata}'
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'{postings}')
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metadata_template = ' ;{0}: {1}\n'
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# TODO: Generate metadata for 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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# XXX: Even I hardly understands what this does, however I indent it it
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# stays unreadable.
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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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metadata=''.join([
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metadata_template.format(k, v)
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for k, v in transaction.metadata.items()]),
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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(str(p.amount.amount)) + 1 + 2)
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)) for p in transaction.postings
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])
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).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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self.commit_changes('Added transaction %s' % transaction.id)
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_log.info('Added transaction %s', transaction.id)
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_log.debug('written to file: %s', output)
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return transaction.id
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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 get_transactions(self):
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return self.reg()
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def get_transaction(self, transaction_id):
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transactions = self.get_transactions()
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for transaction in transactions:
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if transaction.id == transaction_id:
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return transaction
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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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# Get the posting metadata
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metadata = {}
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values = posting.findall('./metadata/value')
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if values:
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for value in values:
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key = value.get('key')
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value = value.find('./string').text
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_log.debug('metadata: %s: %s', key, value)
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metadata.update({key: value})
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postings.append(
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Posting(account=account,
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metadata=metadata,
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amount=Amount(amount=amount, symbol=symbol)))
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# Get the transaction metadata
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metadata = {}
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values = transaction.findall('./metadata/value')
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if values:
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for value in values:
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key = value.get('key')
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value = value.find('./string').text
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_log.debug('metadata: %s: %s', key, value)
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metadata.update({key: value})
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# Add a Transaction instance to the list
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try:
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id = metadata.pop('Id')
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except KeyError:
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_log.warning('Transaction on %s with payee %s does not have an'
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' Id attribute. A temporary ID will be used.',
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date, payee)
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id = 'NO-ID'
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entries.append(
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Transaction(id=id, date=date, payee=payee, postings=postings,
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metadata=metadata))
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return entries
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def delete_transaction(self, transaction_id):
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'''
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Delete a transaction from the ledger file.
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This method opens the ledger file, loads all lines into memory and
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looks for the transaction_id, then looks for the bounds of that
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transaction in the ledger file, removes all lines within the bounds of
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the transaction and removes them, then writes the lines back to the
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ledger file.
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Exceptions:
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- RuntimeError: If all boundaries to the transaction are not found
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- TransactionNotFound: If no such transaction_id can be found in
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:data:`self.ledger_file`
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'''
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f = open(self.ledger_file, 'r')
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lines = [i for i in f]
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# A mapping of line meanings and their line numbers as found by the
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# following logic
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semantic_lines = dict(
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id_location=None,
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transaction_start=None,
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next_transaction_or_eof=None
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)
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for i, line in enumerate(lines):
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if transaction_id in line:
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semantic_lines['id_location'] = i
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break
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if not semantic_lines['id_location']:
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raise TransactionNotFound(
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'No transaction with ID "{0}" found'.format(transaction_id))
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transaction_start_pattern = re.compile(r'^\S')
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cursor = semantic_lines['id_location'] - 1
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# Find the first line of the transaction
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while True:
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if transaction_start_pattern.match(lines[cursor]):
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semantic_lines['transaction_start'] = cursor
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break
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cursor -= 1
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cursor = semantic_lines['id_location'] + 1
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# Find the last line of the transaction
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while True:
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try:
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if transaction_start_pattern.match(lines[cursor]):
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semantic_lines['next_transaction_or_eof'] = cursor
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break
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except IndexError:
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# Set next_line_without_starting_space_or_end_of_file to
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# the cursor. The cursor will be an index not included in the
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# list of lines
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semantic_lines['next_transaction_or_eof'] = cursor
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break
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cursor += 1
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if not all(map(lambda v: v is not None, semantic_lines.values())):
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raise RuntimeError('Could not find all the values necessary for'
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' safe deletion of a transaction.')
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del_start = semantic_lines['transaction_start']
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if len(lines) == semantic_lines['next_transaction_or_eof']:
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_log.debug('There are no transactions below the transaction being'
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' deleted. The line before the first line of the'
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' transaction will be deleted.')
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# Delete the preceding line to make the file
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del_start -= 1
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_log.info('Removing transaction with ID: %s (lines %d-%d)',
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transaction_id,
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del_start,
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semantic_lines['next_transaction_or_eof'])
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del lines[del_start:semantic_lines['next_transaction_or_eof']]
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with open(self.ledger_file, 'w') as f:
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for line in lines:
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f.write(line)
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self.commit_changes('Removed transaction %s' % transaction_id)
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def update_transaction(self, transaction):
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'''
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Update a transaction in the ledger file.
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Takes a :class:`~accounting.models.Transaction` object and removes
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the old transaction using :data:`transaction.id` from the passed
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:class:`~accounting.models.Transaction` instance and adds
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:data:`transaction` to the database.
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'''
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if not transaction.id:
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return AccountingException(('The transaction {0} has no'
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' id attribute').format(transaction))
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old_transaction = self.get_transaction(transaction.id)
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self.delete_transaction(transaction.id)
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self.add_transaction(transaction)
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_log.info('Updated transaction %s', transaction.id)
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_log.debug('Updated transaction from: %s to: %s', old_transaction,
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transaction)
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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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