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annotate roundup/backends/__init__.py @ 3854:f4e8dc583256

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Restored subject parser regexp to the string it was before the... ...implementation of customization of it, i.e., the version from CVS revision 1.184 of mailgw.py. This makes 'testFollowupTitleMatchMultiRe' work again.
author Erik Forsberg <forsberg@users.sourceforge.net>
date Sat, 12 May 2007 16:14:54 +0000
parents 04dee2ac29e2
children 9997b941dd6d
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 # $Id: __init__.py,v 1.39 2006-10-09 23:49:32 richard Exp $
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19
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20 '''Container for the hyperdb storage backend implementations.
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21 '''
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22 __docformat__ = 'restructuredtext'
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23
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24 import sys
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25
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26 # These names are used to suppress import errors.
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27 # If get_backend raises an ImportError with appropriate
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28 # module name, have_backend quietly returns False.
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29 # Otherwise the error is reraised.
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30 _modules = {
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31 'mysql': ('MySQLdb',),
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32 'postgresql': ('psycopg',),
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33 'tsearch2': ('psycopg',),
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34 'sqlite': ('pysqlite', 'pysqlite2', 'sqlite3', '_sqlite3'),
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35 }
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36
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37 def get_backend(name):
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38 '''Get a specific backend by name.'''
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39 vars = globals()
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40 # if requested backend has been imported yet, return current instance
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41 if vars.has_key(name):
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42 return vars[name]
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43 # import the backend module
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44 module_name = 'back_%s' % name
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45 try:
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46 module = __import__(module_name, vars)
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47 except:
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48 # import failed, but in versions prior to 2.4, a (broken)
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49 # module is left in sys.modules and package globals;
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50 # subsequent imports would succeed and get the broken module.
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51 # This no longer happens in Python 2.4 and later.
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52 if sys.version_info < (2, 4):
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53 del sys.modules['.'.join((__name__, module_name))]
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54 del vars[module_name]
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55 raise
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56 else:
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57 vars[name] = module
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58 return module
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59
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60 def have_backend(name):
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61 '''Is backend "name" available?'''
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62 if name == 'tsearch2':
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63 # currently not working
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64 return 0
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65 try:
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66 get_backend(name)
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67 return 1
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68 except ImportError, e:
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69 for name in _modules.get(name, (name,)):
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70 if str(e).startswith('No module named %s'%name):
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71 return 0
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72 raise
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73 return 0
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74
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75 def list_backends():
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76 '''List all available backend names.
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77
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78 This function has side-effect of registering backward-compatible
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79 globals for all available backends.
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80
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81 '''
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82 l = []
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83 for name in 'anydbm', 'mysql', 'sqlite', 'metakit', 'postgresql':
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84 if have_backend(name):
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85 l.append(name)
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86 return l
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87
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88 # vim: set filetype=python sts=4 sw=4 et si :
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