Mercurial > hg
annotate hgext/remotefilelog/metadatastore.py @ 47012:d55b71393907
node: replace nullid and friends with nodeconstants class
The introduction of 256bit hashes require changes to nullid and other
constant magic values. Start pushing them down from repository and
revlog where sensible.
Differential Revision: https://phab.mercurial-scm.org/D9465
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Mon, 29 Mar 2021 01:52:06 +0200 |
parents | 9f70512ae2cf |
children | 6000f5b25c9b |
rev | line source |
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1 from __future__ import absolute_import |
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2 |
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3 from mercurial.node import ( |
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4 hex, |
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5 sha1nodeconstants, |
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6 ) |
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7 from . import ( |
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8 basestore, |
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9 shallowutil, |
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10 ) |
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11 |
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12 |
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13 class unionmetadatastore(basestore.baseunionstore): |
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14 def __init__(self, *args, **kwargs): |
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15 super(unionmetadatastore, self).__init__(*args, **kwargs) |
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16 |
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17 self.stores = args |
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18 self.writestore = kwargs.get('writestore') |
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19 |
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20 # If allowincomplete==True then the union store can return partial |
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21 # ancestor lists, otherwise it will throw a KeyError if a full |
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22 # history can't be found. |
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23 self.allowincomplete = kwargs.get('allowincomplete', False) |
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24 |
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25 def getancestors(self, name, node, known=None): |
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26 """Returns as many ancestors as we're aware of. |
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27 |
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28 return value: { |
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29 node: (p1, p2, linknode, copyfrom), |
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30 ... |
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31 } |
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32 """ |
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33 if known is None: |
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34 known = set() |
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35 if node in known: |
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36 return [] |
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37 |
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38 ancestors = {} |
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39 |
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40 def traverse(curname, curnode): |
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41 # TODO: this algorithm has the potential to traverse parts of |
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42 # history twice. Ex: with A->B->C->F and A->B->D->F, both D and C |
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43 # may be queued as missing, then B and A are traversed for both. |
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44 queue = [(curname, curnode)] |
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45 missing = [] |
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46 seen = set() |
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47 while queue: |
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48 name, node = queue.pop() |
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49 if (name, node) in seen: |
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50 continue |
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51 seen.add((name, node)) |
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52 value = ancestors.get(node) |
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53 if not value: |
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54 missing.append((name, node)) |
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55 continue |
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56 p1, p2, linknode, copyfrom = value |
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57 if p1 != sha1nodeconstants.nullid and p1 not in known: |
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58 queue.append((copyfrom or curname, p1)) |
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59 if p2 != sha1nodeconstants.nullid and p2 not in known: |
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60 queue.append((curname, p2)) |
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61 return missing |
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62 |
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63 missing = [(name, node)] |
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64 while missing: |
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65 curname, curnode = missing.pop() |
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66 try: |
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67 ancestors.update( |
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68 self._getpartialancestors(curname, curnode, known=known) |
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69 ) |
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70 newmissing = traverse(curname, curnode) |
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71 missing.extend(newmissing) |
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72 except KeyError: |
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73 # If we allow incomplete histories, don't throw. |
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74 if not self.allowincomplete: |
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75 raise |
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76 # If the requested name+node doesn't exist, always throw. |
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77 if (curname, curnode) == (name, node): |
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78 raise |
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79 |
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80 # TODO: ancestors should probably be (name, node) -> (value) |
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81 return ancestors |
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82 |
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83 @basestore.baseunionstore.retriable |
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84 def _getpartialancestors(self, name, node, known=None): |
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85 for store in self.stores: |
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86 try: |
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87 return store.getancestors(name, node, known=known) |
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88 except KeyError: |
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89 pass |
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90 |
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91 raise KeyError((name, hex(node))) |
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92 |
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93 @basestore.baseunionstore.retriable |
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94 def getnodeinfo(self, name, node): |
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95 for store in self.stores: |
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96 try: |
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97 return store.getnodeinfo(name, node) |
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98 except KeyError: |
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99 pass |
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100 |
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101 raise KeyError((name, hex(node))) |
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102 |
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103 def add(self, name, node, data): |
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104 raise RuntimeError( |
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105 b"cannot add content only to remotefilelog contentstore" |
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106 ) |
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107 |
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108 def getmissing(self, keys): |
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109 missing = keys |
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110 for store in self.stores: |
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111 if missing: |
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112 missing = store.getmissing(missing) |
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113 return missing |
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114 |
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115 def markledger(self, ledger, options=None): |
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116 for store in self.stores: |
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117 store.markledger(ledger, options) |
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118 |
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119 def getmetrics(self): |
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120 metrics = [s.getmetrics() for s in self.stores] |
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121 return shallowutil.sumdicts(*metrics) |
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122 |
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123 |
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124 class remotefilelogmetadatastore(basestore.basestore): |
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125 def getancestors(self, name, node, known=None): |
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126 """Returns as many ancestors as we're aware of. |
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127 |
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128 return value: { |
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129 node: (p1, p2, linknode, copyfrom), |
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130 ... |
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131 } |
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132 """ |
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133 data = self._getdata(name, node) |
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134 ancestors = shallowutil.ancestormap(data) |
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135 return ancestors |
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136 |
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137 def getnodeinfo(self, name, node): |
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138 return self.getancestors(name, node)[node] |
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139 |
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140 def add(self, name, node, parents, linknode): |
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141 raise RuntimeError( |
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142 b"cannot add metadata only to remotefilelog metadatastore" |
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143 ) |
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144 |
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145 |
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146 class remotemetadatastore(object): |
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147 def __init__(self, ui, fileservice, shared): |
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148 self._fileservice = fileservice |
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149 self._shared = shared |
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150 |
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151 def getancestors(self, name, node, known=None): |
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152 self._fileservice.prefetch( |
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153 [(name, hex(node))], force=True, fetchdata=False, fetchhistory=True |
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154 ) |
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155 return self._shared.getancestors(name, node, known=known) |
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156 |
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157 def getnodeinfo(self, name, node): |
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158 return self.getancestors(name, node)[node] |
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159 |
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160 def add(self, name, node, data): |
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161 raise RuntimeError(b"cannot add to a remote store") |
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162 |
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163 def getmissing(self, keys): |
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164 return keys |
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165 |
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166 def markledger(self, ledger, options=None): |
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167 pass |