Mercurial > hg
annotate hgext/remotefilelog/metadatastore.py @ 43727:5b90a050082b
scmutil: add assertions to help pytype
Differential Revision: https://phab.mercurial-scm.org/D7456
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Tue, 19 Nov 2019 14:13:04 -0500 |
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children | d55b71393907 |
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1 from __future__ import absolute_import |
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2 |
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3 from mercurial.node import hex, nullid |
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4 from . import ( |
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5 basestore, |
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6 shallowutil, |
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7 ) |
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8 |
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9 |
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10 class unionmetadatastore(basestore.baseunionstore): |
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11 def __init__(self, *args, **kwargs): |
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12 super(unionmetadatastore, self).__init__(*args, **kwargs) |
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13 |
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14 self.stores = args |
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15 self.writestore = kwargs.get('writestore') |
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16 |
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17 # If allowincomplete==True then the union store can return partial |
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18 # ancestor lists, otherwise it will throw a KeyError if a full |
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19 # history can't be found. |
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20 self.allowincomplete = kwargs.get('allowincomplete', False) |
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21 |
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22 def getancestors(self, name, node, known=None): |
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23 """Returns as many ancestors as we're aware of. |
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24 |
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25 return value: { |
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26 node: (p1, p2, linknode, copyfrom), |
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27 ... |
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28 } |
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29 """ |
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30 if known is None: |
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31 known = set() |
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32 if node in known: |
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33 return [] |
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34 |
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35 ancestors = {} |
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36 |
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37 def traverse(curname, curnode): |
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38 # TODO: this algorithm has the potential to traverse parts of |
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39 # history twice. Ex: with A->B->C->F and A->B->D->F, both D and C |
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40 # may be queued as missing, then B and A are traversed for both. |
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41 queue = [(curname, curnode)] |
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42 missing = [] |
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43 seen = set() |
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44 while queue: |
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45 name, node = queue.pop() |
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46 if (name, node) in seen: |
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47 continue |
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48 seen.add((name, node)) |
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49 value = ancestors.get(node) |
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50 if not value: |
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51 missing.append((name, node)) |
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52 continue |
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53 p1, p2, linknode, copyfrom = value |
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54 if p1 != nullid and p1 not in known: |
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55 queue.append((copyfrom or curname, p1)) |
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56 if p2 != nullid and p2 not in known: |
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57 queue.append((curname, p2)) |
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58 return missing |
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59 |
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60 missing = [(name, node)] |
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61 while missing: |
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62 curname, curnode = missing.pop() |
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63 try: |
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64 ancestors.update( |
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65 self._getpartialancestors(curname, curnode, known=known) |
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66 ) |
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67 newmissing = traverse(curname, curnode) |
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68 missing.extend(newmissing) |
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69 except KeyError: |
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70 # If we allow incomplete histories, don't throw. |
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71 if not self.allowincomplete: |
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72 raise |
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73 # If the requested name+node doesn't exist, always throw. |
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74 if (curname, curnode) == (name, node): |
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75 raise |
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76 |
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77 # TODO: ancestors should probably be (name, node) -> (value) |
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78 return ancestors |
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79 |
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80 @basestore.baseunionstore.retriable |
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81 def _getpartialancestors(self, name, node, known=None): |
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82 for store in self.stores: |
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83 try: |
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84 return store.getancestors(name, node, known=known) |
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85 except KeyError: |
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86 pass |
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87 |
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88 raise KeyError((name, hex(node))) |
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89 |
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90 @basestore.baseunionstore.retriable |
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91 def getnodeinfo(self, name, node): |
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92 for store in self.stores: |
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93 try: |
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94 return store.getnodeinfo(name, node) |
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95 except KeyError: |
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96 pass |
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97 |
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98 raise KeyError((name, hex(node))) |
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99 |
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100 def add(self, name, node, data): |
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101 raise RuntimeError( |
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102 b"cannot add content only to remotefilelog contentstore" |
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103 ) |
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104 |
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105 def getmissing(self, keys): |
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106 missing = keys |
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107 for store in self.stores: |
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108 if missing: |
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109 missing = store.getmissing(missing) |
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110 return missing |
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111 |
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112 def markledger(self, ledger, options=None): |
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113 for store in self.stores: |
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114 store.markledger(ledger, options) |
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115 |
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116 def getmetrics(self): |
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117 metrics = [s.getmetrics() for s in self.stores] |
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118 return shallowutil.sumdicts(*metrics) |
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119 |
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120 |
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121 class remotefilelogmetadatastore(basestore.basestore): |
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122 def getancestors(self, name, node, known=None): |
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123 """Returns as many ancestors as we're aware of. |
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124 |
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125 return value: { |
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126 node: (p1, p2, linknode, copyfrom), |
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127 ... |
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128 } |
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129 """ |
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130 data = self._getdata(name, node) |
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131 ancestors = shallowutil.ancestormap(data) |
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132 return ancestors |
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133 |
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134 def getnodeinfo(self, name, node): |
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135 return self.getancestors(name, node)[node] |
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136 |
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137 def add(self, name, node, parents, linknode): |
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138 raise RuntimeError( |
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139 b"cannot add metadata only to remotefilelog metadatastore" |
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140 ) |
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141 |
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142 |
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143 class remotemetadatastore(object): |
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144 def __init__(self, ui, fileservice, shared): |
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145 self._fileservice = fileservice |
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146 self._shared = shared |
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147 |
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148 def getancestors(self, name, node, known=None): |
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149 self._fileservice.prefetch( |
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150 [(name, hex(node))], force=True, fetchdata=False, fetchhistory=True |
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151 ) |
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152 return self._shared.getancestors(name, node, known=known) |
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153 |
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154 def getnodeinfo(self, name, node): |
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155 return self.getancestors(name, node)[node] |
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156 |
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157 def add(self, name, node, data): |
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158 raise RuntimeError(b"cannot add to a remote store") |
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159 |
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160 def getmissing(self, keys): |
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161 return keys |
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162 |
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163 def markledger(self, ledger, options=None): |
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164 pass |