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comparison roundup/backends/__init__.py @ 8259:d7cc63d7a857

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chore(ruff): var name changes; unused import; formatting Handle vars variable hiding builting vars(). Use more descripting variable name. Remove unused sys import. Add double lines where needed.
author John Rouillard <rouilj@ieee.org>
date Sat, 04 Jan 2025 20:50:59 -0500
parents 95f91b6f0386
children
comparison
equal deleted inserted replaced
8258:5c5723cd721a 8259:d7cc63d7a857
17 17
18 '''Container for the hyperdb storage backend implementations. 18 '''Container for the hyperdb storage backend implementations.
19 ''' 19 '''
20 __docformat__ = 'restructuredtext' 20 __docformat__ = 'restructuredtext'
21 21
22 import sys
23
24 # These names are used to suppress import errors. 22 # These names are used to suppress import errors.
25 # If get_backend raises an ImportError with appropriate 23 # If get_backend raises an ImportError with appropriate
26 # module name, have_backend quietly returns False. 24 # module name, have_backend quietly returns False.
27 # Otherwise the error is reraised. 25 # Otherwise the error is reraised.
28 _modules = { 26 _modules = {
29 'mysql': ('MySQLdb',), 27 'mysql': ('MySQLdb',),
30 'postgresql': ('psycopg2',), 28 'postgresql': ('psycopg2',),
31 'sqlite': ('sqlite3', '_sqlite3'), 29 'sqlite': ('sqlite3', '_sqlite3'),
32 } 30 }
33 31
32
34 def get_backend(name): 33 def get_backend(name):
35 '''Get a specific backend by name.''' 34 '''Get a specific backend by name.'''
36 vars = globals() 35 global_vars = globals()
37 # if requested backend has been imported yet, return current instance 36 # if requested backend has been imported yet, return current instance
38 if name in vars: 37 if name in global_vars:
39 return vars[name] 38 return global_vars[name]
40 # import the backend module 39 # import the backend module
41 module_name = 'back_%s' % name 40 module_name = 'back_%s' % name
42 module = __import__(module_name, vars, level=1) 41 module = __import__(module_name, global_vars, level=1)
43 vars[name] = module 42 global_vars[name] = module
44 return module 43 return module
44
45 45
46 def have_backend(name): 46 def have_backend(name):
47 '''Is backend "name" available?''' 47 '''Is backend "name" available?'''
48 try: 48 try:
49 get_backend(name) 49 get_backend(name)
60 if modname and (modname in _modules.get(name, (name,))): 60 if modname and (modname in _modules.get(name, (name,))):
61 return 0 61 return 0
62 raise 62 raise
63 return 0 63 return 0
64 64
65
65 def list_backends(): 66 def list_backends():
66 '''List all available backend names. 67 '''List all available backend names.
67 68
68 This function has side-effect of registering backward-compatible 69 This function has side-effect of registering backward-compatible
69 globals for all available backends. 70 globals for all available backends.
73 test/memorydb and injecting into roundup.backends. So the normal user 74 test/memorydb and injecting into roundup.backends. So the normal user
74 can never configure memorydb but it makes using the tests easier 75 can never configure memorydb but it makes using the tests easier
75 because we do not need to monkey-patch list_backends. 76 because we do not need to monkey-patch list_backends.
76 77
77 ''' 78 '''
78 l = [] 79 backend_list = []
79 for name in 'anydbm', 'mysql', 'sqlite', 'postgresql', 'memorydb': 80 for name in 'anydbm', 'mysql', 'sqlite', 'postgresql', 'memorydb':
80 if have_backend(name): 81 if have_backend(name):
81 l.append(name) 82 backend_list.append(name)
82 return l 83 return backend_list
83 84
84 # vim: set filetype=python sts=4 sw=4 et si : 85 # vim: set filetype=python sts=4 sw=4 et si :
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