Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/demandload.py @ 2439:e8c4f3d3df8c
extend network protocol to stop clients from locking servers
now all repositories have capabilities slot, tuple with list of names.
if 'unbundle' capability present, repo supports push where client does
not need to lock server. repository classes that have unbundle capability
also have unbundle method.
implemented for ssh now, will be base for push over http.
unbundle protocol acts this way. server tells client what heads it
has during normal negotiate step. client starts unbundle by repeat
server's heads back to it. if server has new heads, abort immediately.
otherwise, transfer changes to server. once data transferred, server
locks and checks heads again. if heads same, changes can be added.
else someone else added heads, and server aborts.
if client wants to force server to add heads, sends special heads list of
'force'.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Thu, 15 Jun 2006 16:37:23 -0700 |
parents | d01eac5968c6 |
children | a8a7ce1a01a5 |
rev | line source |
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1 '''Demand load modules when used, not when imported.''' |
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2 |
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3 __author__ = '''Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>. |
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4 This software may be used and distributed according to the terms |
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5 of the GNU General Public License, incorporated herein by reference.''' |
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6 |
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7 # this is based on matt's original demandload module. it is a |
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8 # complete rewrite. some time, we may need to support syntax of |
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9 # "import foo as bar". |
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10 |
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11 class _importer(object): |
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12 '''import a module. it is not imported until needed, and is |
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13 imported at most once per scope.''' |
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14 |
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15 def __init__(self, scope, modname, fromlist): |
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16 '''scope is context (globals() or locals()) in which import |
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17 should be made. modname is name of module to import. |
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18 fromlist is list of modules for "from foo import ..." |
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19 emulation.''' |
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20 |
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21 self.scope = scope |
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22 self.modname = modname |
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23 self.fromlist = fromlist |
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24 self.mod = None |
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25 |
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26 def module(self): |
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27 '''import the module if needed, and return.''' |
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28 if self.mod is None: |
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29 self.mod = __import__(self.modname, self.scope, self.scope, |
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30 self.fromlist) |
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31 del self.modname, self.fromlist |
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32 return self.mod |
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33 |
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34 class _replacer(object): |
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35 '''placeholder for a demand loaded module. demandload puts this in |
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36 a target scope. when an attribute of this object is looked up, |
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37 this object is replaced in the target scope with the actual |
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38 module. |
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39 |
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40 we use __getattribute__ to avoid namespace clashes between |
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41 placeholder object and real module.''' |
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42 |
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43 def __init__(self, importer, target): |
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44 self.importer = importer |
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45 self.target = target |
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46 # consider case where we do this: |
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47 # demandload(globals(), 'foo.bar foo.quux') |
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48 # foo will already exist in target scope when we get to |
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49 # foo.quux. so we remember that we will need to demandload |
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50 # quux into foo's scope when we really load it. |
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51 self.later = [] |
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52 |
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53 def module(self): |
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54 return object.__getattribute__(self, 'importer').module() |
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55 |
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56 def __getattribute__(self, key): |
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57 '''look up an attribute in a module and return it. replace the |
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58 name of the module in the caller\'s dict with the actual |
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59 module.''' |
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61 module = object.__getattribute__(self, 'module')() |
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62 target = object.__getattribute__(self, 'target') |
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63 importer = object.__getattribute__(self, 'importer') |
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64 later = object.__getattribute__(self, 'later') |
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65 |
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66 if later: |
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67 demandload(module.__dict__, ' '.join(later)) |
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68 |
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69 importer.scope[target] = module |
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70 |
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71 return getattr(module, key) |
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72 |
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73 class _replacer_from(_replacer): |
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74 '''placeholder for a demand loaded module. used for "from foo |
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75 import ..." emulation. semantics of this are different than |
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76 regular import, so different implementation needed.''' |
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77 |
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78 def module(self): |
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79 importer = object.__getattribute__(self, 'importer') |
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80 target = object.__getattribute__(self, 'target') |
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81 |
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82 return getattr(importer.module(), target) |
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83 |
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84 def __call__(self, *args, **kwargs): |
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85 target = object.__getattribute__(self, 'module')() |
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86 return target(*args, **kwargs) |
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87 |
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88 def demandload(scope, modules): |
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89 '''import modules into scope when each is first used. |
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90 |
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91 scope should be the value of globals() in the module calling this |
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92 function, or locals() in the calling function. |
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93 |
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94 modules is a string listing module names, separated by white |
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95 space. names are handled like this: |
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97 foo import foo |
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98 foo bar import foo, bar |
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99 foo.bar import foo.bar |
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100 foo:bar from foo import bar |
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101 foo:bar,quux from foo import bar, quux |
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102 foo.bar:quux from foo.bar import quux''' |
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104 for mod in modules.split(): |
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105 col = mod.find(':') |
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106 if col >= 0: |
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107 fromlist = mod[col+1:].split(',') |
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108 mod = mod[:col] |
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109 else: |
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110 fromlist = [] |
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111 importer = _importer(scope, mod, fromlist) |
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112 if fromlist: |
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113 for name in fromlist: |
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114 scope[name] = _replacer_from(importer, name) |
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115 else: |
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116 dot = mod.find('.') |
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117 if dot >= 0: |
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118 basemod = mod[:dot] |
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119 val = scope.get(basemod) |
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120 # if base module has already been demandload()ed, |
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121 # remember to load this submodule into its namespace |
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122 # when needed. |
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123 if isinstance(val, _replacer): |
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124 later = object.__getattribute__(val, 'later') |
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125 later.append(mod[dot+1:]) |
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126 continue |
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127 else: |
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128 basemod = mod |
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129 scope[basemod] = _replacer(importer, basemod) |