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annotate roundup/web/router.py @ 4999:e9077def7678 routing

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router: Add interactive mode and iterator over urlmap
author anatoly techtonik <techtonik@gmail.com>
date Thu, 10 Sep 2015 12:33:12 +0300
parents d8e0af01543b
children ce06c665932a
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1 #!/usr/bin/env python
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2 # This Router component was written by techtonik@gmail.com and it's been
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3 # placed in the Public Domain. Copy and modify to your heart's content.
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4
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5 """
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6 The purpose of router is to make Roundup URL scheme configurable
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7 and allow extensions add their own handlers and URLs to tracker.
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8 """
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9
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10 DEBUG = False
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11
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12
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13 import re
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14
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15 # --- Example URL mapping
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16
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17 class NamedObject(object):
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18 """Object that outputs its name when printed"""
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19 def __init__(self, name):
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20 self.name = name
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21 def __repr__(self):
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22 return self.name
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23
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24 ExampleHandler = NamedObject('ExampleHandler')
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25 ExampleFileHandler = NamedObject('ExampleFileHandler')
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26
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27
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28 EXAMPLE_URL_MAP = (
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29 'static/(.*)', ExampleFileHandler,
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30 'index', ExampleHandler
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31 )
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32
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33 # --- Helper functions
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34
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35 def entry(prompt='> '):
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36 """Just get text for interactive mode"""
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37 import sys
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38 if sys.version_info[0] < 3:
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39 return raw_input(prompt)
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40 else:
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41 return input(prompt)
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42
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43 # --- Regexp based router
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44
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45 class Router(object):
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46
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47 urlmap = []
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48
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49 def __init__(self, urlmap=[]):
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50 """
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51 `urlmap` is a list (pattern, handler, pattern, ...)
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52 leading slash in pattern is stripped
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53 """
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54 self.urlmap = urlmap
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55
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56 def get_handler(self, urlpath):
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57 """
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58 `urlpath` is a part of url /that/looks?like=this
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59 (leading slash is optional, will be stripped anyway)
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60
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61 returns tuple (handler, arguments) or (None, ())
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62 """
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63 # strip leading slashes before matching
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64 path = urlpath.lstrip('/')
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65 for pattern, handler in self.iter_urlmap():
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66 pattern = pattern.lstrip('/')
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67 if DEBUG:
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68 print('router: matching %s' % pattern)
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69 match = re.match(pattern, path)
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70 if match:
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71 return handler, match.groups()
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72 return (None, ())
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73
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74 def iter_urlmap(self):
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75 """
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76 iterate over self.urlmap returning (pattern, handler) pairs
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77 """
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78 for i in range(0, len(self.urlmap), 2):
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79 yield self.urlmap[i], self.urlmap[i+1]
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80
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81 def interactive(self):
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82 print('enter url to test, [l] to list rules, empty line exits')
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83 url = entry('url: ')
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84 while url != '':
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85 if url == 'l':
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86 for i in range(0, len(self.urlmap), 2):
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87 pattern, handler = self.urlmap[i], self.urlmap[i+1]
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88 print(self.urlmap[i:i+2])
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89 print('matched ' + str(self.get_handler(url)))
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90 url = entry('url: ')
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91
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92
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93 # [ ] len(urlmap) should be even to avoid errors
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94 # (find a way to explain this to users)
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95
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96 if __name__ == '__main__':
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97
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98 import sys
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99 if '-i' in sys.argv:
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100 router = Router(EXAMPLE_URL_MAP)
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101 router.interactive()
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102 sys.exit()
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103
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104 import unittest
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105 class test_Router(unittest.TestCase):
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106 def test_example_routes(self):
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107 router = Router(EXAMPLE_URL_MAP)
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108 self.assertEqual(router.get_handler(''), (None, ()))
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109 handler, params = router.get_handler('/index')
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110 self.assertEqual(handler, ExampleHandler)
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111 self.assertEqual(params, tuple())
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112
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113 def test_route_param(self):
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114 def echo_handler(args):
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115 return args
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116 router = Router(('/files/(.*)', echo_handler))
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117 self.assertEqual(router.get_handler(''), (None, ()))
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118 self.assertEqual(router.get_handler('/files'), (None, ()))
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119 handler, params = router.get_handler('/files/filename')
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120 self.assertEqual(handler, echo_handler)
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121 self.assertEqual(params, ('filename',))
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122
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123 unittest.main()
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