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annotate roundup/backends/__init__.py @ 5973:fe334430ca07

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issue2550919 - Anti-bot signup using 4 second delay Took the code by erik forsberg and massaged it into the core. So this is no longer needed in the tracker. Updated devel and responsive trackers to remove timestamp.py and update input field name. Docs, changes and tests complete. Hopefully these tracker changes won't cause an issue for other tests.
author John Rouillard <rouilj@ieee.org>
date Sat, 09 Nov 2019 00:30:37 -0500
parents 22eecc8a8bd4
children 7f00fc5958ca
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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 '''Container for the hyperdb storage backend implementations.
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19 '''
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20 __docformat__ = 'restructuredtext'
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22 import sys
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24 # These names are used to suppress import errors.
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25 # If get_backend raises an ImportError with appropriate
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26 # module name, have_backend quietly returns False.
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27 # Otherwise the error is reraised.
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28 _modules = {
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29 'mysql': ('MySQLdb',),
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30 'postgresql': ('psycopg2',),
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31 'sqlite': ('pysqlite', 'pysqlite2', 'sqlite3', '_sqlite3', 'sqlite'),
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32 }
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33
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34 def get_backend(name):
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35 '''Get a specific backend by name.'''
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36 vars = globals()
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37 # if requested backend has been imported yet, return current instance
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38 if name in vars:
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39 return vars[name]
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40 # import the backend module
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41 module_name = 'back_%s' % name
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42 module = __import__(module_name, vars, level=1)
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43 vars[name] = module
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44 return module
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46 def have_backend(name):
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47 '''Is backend "name" available?'''
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48 try:
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49 get_backend(name)
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50 return 1
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51 except ImportError as e:
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52 if hasattr(e, 'name'):
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53 modname = e.name
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54 else:
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55 modname = e.args[0][16:] if e.args[0].startswith('No module named ') else None
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56
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57 if modname and (modname in _modules.get(name, (name,))):
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58 return 0
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59 raise
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60 return 0
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62 def list_backends():
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63 '''List all available backend names.
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64
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65 This function has side-effect of registering backward-compatible
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66 globals for all available backends.
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68 '''
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69 l = []
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70 for name in 'anydbm', 'mysql', 'sqlite', 'postgresql':
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71 if have_backend(name):
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72 l.append(name)
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73 return l
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74
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75 # vim: set filetype=python sts=4 sw=4 et si :
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