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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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import os
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import re
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import shutil
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import logging
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from migrate import exceptions
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from migrate.versioning import pathed, script
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log = logging.getLogger(__name__)
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class VerNum(object):
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"""A version number that behaves like a string and int at the same time"""
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_instances = dict()
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def __new__(cls, value):
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val = str(value)
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if val not in cls._instances:
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cls._instances[val] = super(VerNum, cls).__new__(cls)
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ret = cls._instances[val]
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return ret
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def __init__(self,value):
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self.value = str(int(value))
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if self < 0:
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raise ValueError("Version number cannot be negative")
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def __add__(self, value):
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ret = int(self) + int(value)
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return VerNum(ret)
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def __sub__(self, value):
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return self + (int(value) * -1)
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def __cmp__(self, value):
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return int(self) - int(value)
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def __repr__(self):
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return "<VerNum(%s)>" % self.value
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def __str__(self):
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return str(self.value)
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def __int__(self):
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return int(self.value)
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class Collection(pathed.Pathed):
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"""A collection of versioning scripts in a repository"""
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FILENAME_WITH_VERSION = re.compile(r'^(\d{3,}).*')
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def __init__(self, path):
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"""Collect current version scripts in repository
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and store them in self.versions
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"""
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super(Collection, self).__init__(path)
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# Create temporary list of files, allowing skipped version numbers.
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files = os.listdir(path)
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if '1' in files:
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# deprecation
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raise Exception('It looks like you have a repository in the old '
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'format (with directories for each version). '
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'Please convert repository before proceeding.')
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tempVersions = dict()
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for filename in files:
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match = self.FILENAME_WITH_VERSION.match(filename)
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if match:
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num = int(match.group(1))
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tempVersions.setdefault(num, []).append(filename)
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else:
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pass # Must be a helper file or something, let's ignore it.
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# Create the versions member where the keys
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# are VerNum's and the values are Version's.
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self.versions = dict()
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for num, files in tempVersions.items():
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self.versions[VerNum(num)] = Version(num, path, files)
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@property
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def latest(self):
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""":returns: Latest version in Collection"""
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return max([VerNum(0)] + self.versions.keys())
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def create_new_python_version(self, description, **k):
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"""Create Python files for new version"""
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ver = self.latest + 1
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extra = str_to_filename(description)
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if extra:
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if extra == '_':
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extra = ''
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elif not extra.startswith('_'):
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extra = '_%s' % extra
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filename = '%03d%s.py' % (ver, extra)
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filepath = self._version_path(filename)
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script.PythonScript.create(filepath, **k)
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self.versions[ver] = Version(ver, self.path, [filename])
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def create_new_sql_version(self, database, **k):
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"""Create SQL files for new version"""
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ver = self.latest + 1
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self.versions[ver] = Version(ver, self.path, [])
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# Create new files.
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for op in ('upgrade', 'downgrade'):
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filename = '%03d_%s_%s.sql' % (ver, database, op)
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filepath = self._version_path(filename)
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script.SqlScript.create(filepath, **k)
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self.versions[ver].add_script(filepath)
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def version(self, vernum=None):
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"""Returns latest Version if vernum is not given.
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Otherwise, returns wanted version"""
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if vernum is None:
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vernum = self.latest
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return self.versions[VerNum(vernum)]
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@classmethod
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def clear(cls):
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super(Collection, cls).clear()
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def _version_path(self, ver):
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"""Returns path of file in versions repository"""
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return os.path.join(self.path, str(ver))
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class Version(object):
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"""A single version in a collection
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:param vernum: Version Number
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:param path: Path to script files
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:param filelist: List of scripts
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:type vernum: int, VerNum
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:type path: string
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:type filelist: list
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"""
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def __init__(self, vernum, path, filelist):
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self.version = VerNum(vernum)
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# Collect scripts in this folder
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self.sql = dict()
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self.python = None
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for script in filelist:
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self.add_script(os.path.join(path, script))
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def script(self, database=None, operation=None):
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"""Returns SQL or Python Script"""
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for db in (database, 'default'):
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# Try to return a .sql script first
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try:
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return self.sql[db][operation]
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except KeyError:
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continue # No .sql script exists
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# TODO: maybe add force Python parameter?
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ret = self.python
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assert ret is not None, \
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"There is no script for %d version" % self.version
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return ret
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def add_script(self, path):
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"""Add script to Collection/Version"""
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if path.endswith(Extensions.py):
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self._add_script_py(path)
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elif path.endswith(Extensions.sql):
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self._add_script_sql(path)
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SQL_FILENAME = re.compile(r'^(\d+)_([^_]+)_([^_]+).sql')
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def _add_script_sql(self, path):
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basename = os.path.basename(path)
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match = self.SQL_FILENAME.match(basename)
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if match:
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version, dbms, op = match.group(1), match.group(2), match.group(3)
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else:
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raise exceptions.ScriptError(
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"Invalid SQL script name %s " % basename + \
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"(needs to be ###_database_operation.sql)")
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# File the script into a dictionary
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self.sql.setdefault(dbms, {})[op] = script.SqlScript(path)
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def _add_script_py(self, path):
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if self.python is not None:
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raise exceptions.ScriptError('You can only have one Python script '
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'per version, but you have: %s and %s' % (self.python, path))
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self.python = script.PythonScript(path)
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class Extensions:
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"""A namespace for file extensions"""
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py = 'py'
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sql = 'sql'
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def str_to_filename(s):
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"""Replaces spaces, (double and single) quotes
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and double underscores to underscores
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"""
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s = s.replace(' ', '_').replace('"', '_').replace("'", '_').replace(".", "_")
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while '__' in s:
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s = s.replace('__', '_')
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return s
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