Mercurial > hg
annotate mercurial/peer.py @ 33251:a5cb2e4460de
transaction: track new obsmarkers in the 'changes' mapping
The obsstore collaborate with transaction to make sure we track all the
obsmarkers added during a transaction. This will be useful for various usages:
hooks, caches, better output, etc.
This is the seconds kind of data added to tr.changes (first one was added revisions)
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 27 Jun 2017 02:45:09 +0200 |
parents | ead25aa27a43 |
children | e2fc2122029c |
rev | line source |
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1 # peer.py - repository base classes for mercurial |
1089 | 2 # |
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
2859 | 4 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
1089 | 5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
1089 | 8 |
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9 from __future__ import absolute_import |
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10 |
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11 from .i18n import _ |
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12 from . import ( |
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13 error, |
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14 util, |
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15 ) |
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16 |
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17 # abstract batching support |
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18 |
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19 class future(object): |
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20 '''placeholder for a value to be set later''' |
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21 def set(self, value): |
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22 if util.safehasattr(self, 'value'): |
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23 raise error.RepoError("future is already set") |
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24 self.value = value |
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25 |
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26 class batcher(object): |
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27 '''base class for batches of commands submittable in a single request |
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28 |
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29 All methods invoked on instances of this class are simply queued and |
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30 return a a future for the result. Once you call submit(), all the queued |
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31 calls are performed and the results set in their respective futures. |
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32 ''' |
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33 def __init__(self): |
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34 self.calls = [] |
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35 def __getattr__(self, name): |
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36 def call(*args, **opts): |
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37 resref = future() |
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38 self.calls.append((name, args, opts, resref,)) |
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39 return resref |
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40 return call |
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41 def submit(self): |
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42 raise NotImplementedError() |
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43 |
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44 class iterbatcher(batcher): |
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45 |
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46 def submit(self): |
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47 raise NotImplementedError() |
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48 |
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49 def results(self): |
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50 raise NotImplementedError() |
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51 |
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52 class localbatch(batcher): |
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53 '''performs the queued calls directly''' |
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54 def __init__(self, local): |
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55 batcher.__init__(self) |
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56 self.local = local |
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57 def submit(self): |
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58 for name, args, opts, resref in self.calls: |
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59 resref.set(getattr(self.local, name)(*args, **opts)) |
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60 |
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61 class localiterbatcher(iterbatcher): |
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62 def __init__(self, local): |
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63 super(iterbatcher, self).__init__() |
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64 self.local = local |
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65 |
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66 def submit(self): |
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67 # submit for a local iter batcher is a noop |
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68 pass |
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69 |
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70 def results(self): |
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71 for name, args, opts, resref in self.calls: |
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72 yield getattr(self.local, name)(*args, **opts) |
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73 |
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74 def batchable(f): |
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75 '''annotation for batchable methods |
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76 |
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77 Such methods must implement a coroutine as follows: |
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78 |
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79 @batchable |
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80 def sample(self, one, two=None): |
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81 # Handle locally computable results first: |
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82 if not one: |
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83 yield "a local result", None |
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84 # Build list of encoded arguments suitable for your wire protocol: |
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85 encargs = [('one', encode(one),), ('two', encode(two),)] |
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86 # Create future for injection of encoded result: |
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87 encresref = future() |
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88 # Return encoded arguments and future: |
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89 yield encargs, encresref |
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90 # Assuming the future to be filled with the result from the batched |
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91 # request now. Decode it: |
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92 yield decode(encresref.value) |
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93 |
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94 The decorator returns a function which wraps this coroutine as a plain |
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95 method, but adds the original method as an attribute called "batchable", |
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96 which is used by remotebatch to split the call into separate encoding and |
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97 decoding phases. |
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98 ''' |
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99 def plain(*args, **opts): |
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100 batchable = f(*args, **opts) |
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101 encargsorres, encresref = next(batchable) |
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102 if not encresref: |
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103 return encargsorres # a local result in this case |
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104 self = args[0] |
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105 encresref.set(self._submitone(f.func_name, encargsorres)) |
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106 return next(batchable) |
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107 setattr(plain, 'batchable', f) |
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108 return plain |
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109 |
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110 class peerrepository(object): |
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111 |
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112 def batch(self): |
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113 return localbatch(self) |
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114 |
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115 def iterbatch(self): |
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116 """Batch requests but allow iterating over the results. |
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117 |
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118 This is to allow interleaving responses with things like |
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119 progress updates for clients. |
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120 """ |
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121 return localiterbatcher(self) |
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122 |
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123 def capable(self, name): |
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124 '''tell whether repo supports named capability. |
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125 return False if not supported. |
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126 if boolean capability, return True. |
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127 if string capability, return string.''' |
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128 caps = self._capabilities() |
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129 if name in caps: |
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130 return True |
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131 name_eq = name + '=' |
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132 for cap in caps: |
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133 if cap.startswith(name_eq): |
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134 return cap[len(name_eq):] |
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135 return False |
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136 |
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137 def requirecap(self, name, purpose): |
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138 '''raise an exception if the given capability is not present''' |
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139 if not self.capable(name): |
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141 _('cannot %s; remote repository does not ' | |
142 'support the %r capability') % (purpose, name)) | |
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143 |
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144 def local(self): |
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145 '''return peer as a localrepo, or None''' |
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146 return None |
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147 |
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148 def peer(self): |
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149 return self |
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150 |
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151 def canpush(self): |
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152 return True |
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153 |
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154 def close(self): |
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155 pass |