Mercurial > hg
annotate mercurial/narrowspec.py @ 37056:861e9d37e56e
wireproto: buffer output frames when in half duplex mode
Previously, when told that a response was ready, the server reactor
would instruct the caller to send frames immediately. This was OK
as an initial implementation. But it would not work for half-duplex
connections where the sender can't receive until all data has been
transmitted - such as httplib based clients.
In this commit, we teach the reactor that output frames should
be buffered until end of input is seen. This required a new
event to inform the reactor of end of input. The result from that
event will instruct the consumer to send all buffered frames.
The HTTP server is buffered by default.
This change effectively hides the complexity of buffering within
the reactor so that transports need not be concerned about it.
This helps keep the transports "dumb" and will make implementing
multiple requests-responses per atomic exchange (like an HTTP
request) much simpler.
Differential Revision: https://phab.mercurial-scm.org/D2860
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 14 Mar 2018 14:01:16 -0700 |
parents | d851951b421c |
children | fed6fe856333 |
rev | line source |
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1 # narrowspec.py - methods for working with a narrow view of a repository |
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2 # |
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3 # Copyright 2017 Google, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import errno |
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11 |
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12 from .i18n import _ |
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13 from . import ( |
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14 error, |
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15 match as matchmod, |
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16 util, |
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17 ) |
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18 |
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19 FILENAME = 'narrowspec' |
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20 |
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21 def _parsestoredpatterns(text): |
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22 """Parses the narrowspec format that's stored on disk.""" |
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23 patlist = None |
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24 includepats = [] |
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25 excludepats = [] |
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26 for l in text.splitlines(): |
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27 if l == '[includes]': |
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28 if patlist is None: |
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29 patlist = includepats |
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30 else: |
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31 raise error.Abort(_('narrowspec includes section must appear ' |
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32 'at most once, before excludes')) |
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33 elif l == '[excludes]': |
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34 if patlist is not excludepats: |
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35 patlist = excludepats |
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36 else: |
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37 raise error.Abort(_('narrowspec excludes section must appear ' |
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38 'at most once')) |
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39 else: |
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40 patlist.append(l) |
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41 |
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42 return set(includepats), set(excludepats) |
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43 |
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44 def parseserverpatterns(text): |
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45 """Parses the narrowspec format that's returned by the server.""" |
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46 includepats = set() |
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47 excludepats = set() |
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48 |
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49 # We get one entry per line, in the format "<key> <value>". |
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50 # It's OK for value to contain other spaces. |
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51 for kp in (l.split(' ', 1) for l in text.splitlines()): |
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52 if len(kp) != 2: |
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53 raise error.Abort(_('Invalid narrowspec pattern line: "%s"') % kp) |
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54 key = kp[0] |
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55 pat = kp[1] |
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56 if key == 'include': |
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57 includepats.add(pat) |
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58 elif key == 'exclude': |
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59 excludepats.add(pat) |
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60 else: |
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61 raise error.Abort(_('Invalid key "%s" in server response') % key) |
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62 |
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63 return includepats, excludepats |
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64 |
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65 def normalizesplitpattern(kind, pat): |
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66 """Returns the normalized version of a pattern and kind. |
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67 |
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68 Returns a tuple with the normalized kind and normalized pattern. |
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69 """ |
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70 pat = pat.rstrip('/') |
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71 _validatepattern(pat) |
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72 return kind, pat |
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73 |
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74 def _numlines(s): |
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75 """Returns the number of lines in s, including ending empty lines.""" |
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76 # We use splitlines because it is Unicode-friendly and thus Python 3 |
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77 # compatible. However, it does not count empty lines at the end, so trick |
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78 # it by adding a character at the end. |
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79 return len((s + 'x').splitlines()) |
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80 |
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81 def _validatepattern(pat): |
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82 """Validates the pattern and aborts if it is invalid. |
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83 |
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84 Patterns are stored in the narrowspec as newline-separated |
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85 POSIX-style bytestring paths. There's no escaping. |
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86 """ |
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87 |
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88 # We use newlines as separators in the narrowspec file, so don't allow them |
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89 # in patterns. |
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90 if _numlines(pat) > 1: |
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91 raise error.Abort(_('newlines are not allowed in narrowspec paths')) |
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92 |
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93 components = pat.split('/') |
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94 if '.' in components or '..' in components: |
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95 raise error.Abort(_('"." and ".." are not allowed in narrowspec paths')) |
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96 |
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97 def normalizepattern(pattern, defaultkind='path'): |
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98 """Returns the normalized version of a text-format pattern. |
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99 |
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100 If the pattern has no kind, the default will be added. |
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101 """ |
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102 kind, pat = matchmod._patsplit(pattern, defaultkind) |
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103 return '%s:%s' % normalizesplitpattern(kind, pat) |
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104 |
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105 def parsepatterns(pats): |
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106 """Parses a list of patterns into a typed pattern set.""" |
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107 return set(normalizepattern(p) for p in pats) |
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108 |
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109 def format(includes, excludes): |
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110 output = '[includes]\n' |
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111 for i in sorted(includes - excludes): |
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112 output += i + '\n' |
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113 output += '[excludes]\n' |
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114 for e in sorted(excludes): |
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115 output += e + '\n' |
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116 return output |
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117 |
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118 def match(root, include=None, exclude=None): |
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119 if not include: |
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120 # Passing empty include and empty exclude to matchmod.match() |
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121 # gives a matcher that matches everything, so explicitly use |
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122 # the nevermatcher. |
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123 return matchmod.never(root, '') |
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124 return matchmod.match(root, '', [], include=include or [], |
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125 exclude=exclude or []) |
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126 |
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127 def needsexpansion(includes): |
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128 return [i for i in includes if i.startswith('include:')] |
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129 |
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130 def load(repo): |
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131 try: |
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132 spec = repo.vfs.read(FILENAME) |
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133 except IOError as e: |
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134 # Treat "narrowspec does not exist" the same as "narrowspec file exists |
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135 # and is empty". |
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136 if e.errno == errno.ENOENT: |
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137 # Without this the next call to load will use the cached |
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138 # non-existence of the file, which can cause some odd issues. |
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139 repo.invalidate(clearfilecache=True) |
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140 return set(), set() |
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141 raise |
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142 return _parsestoredpatterns(spec) |
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143 |
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144 def save(repo, includepats, excludepats): |
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145 spec = format(includepats, excludepats) |
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146 repo.vfs.write(FILENAME, spec) |
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147 |
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148 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes): |
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149 r""" Restricts the patterns according to repo settings, |
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150 results in a logical AND operation |
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151 |
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152 :param req_includes: requested includes |
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153 :param req_excludes: requested excludes |
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154 :param repo_includes: repo includes |
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155 :param repo_excludes: repo excludes |
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156 :return: include patterns, exclude patterns, and invalid include patterns. |
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157 |
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158 >>> restrictpatterns({'f1','f2'}, {}, ['f1'], []) |
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159 (set(['f1']), {}, []) |
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160 >>> restrictpatterns({'f1'}, {}, ['f1','f2'], []) |
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161 (set(['f1']), {}, []) |
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162 >>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], []) |
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163 (set(['f1/fc1']), {}, []) |
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164 >>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], []) |
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165 ([], set(['path:.']), []) |
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166 >>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], []) |
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167 (set(['f2/fc2']), {}, []) |
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168 >>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], []) |
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169 ([], set(['path:.']), []) |
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170 >>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], []) |
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171 (set(['f1/$non_exitent_var']), {}, []) |
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172 """ |
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173 res_excludes = set(req_excludes) |
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174 res_excludes.update(repo_excludes) |
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175 invalid_includes = [] |
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176 if not req_includes: |
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177 res_includes = set(repo_includes) |
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178 elif 'path:.' not in repo_includes: |
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179 res_includes = [] |
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180 for req_include in req_includes: |
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181 req_include = util.expandpath(util.normpath(req_include)) |
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182 if req_include in repo_includes: |
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183 res_includes.append(req_include) |
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184 continue |
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185 valid = False |
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186 for repo_include in repo_includes: |
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187 if req_include.startswith(repo_include + '/'): |
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188 valid = True |
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189 res_includes.append(req_include) |
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190 break |
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191 if not valid: |
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192 invalid_includes.append(req_include) |
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193 if len(res_includes) == 0: |
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194 res_excludes = {'path:.'} |
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195 else: |
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196 res_includes = set(res_includes) |
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197 else: |
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198 res_includes = set(req_includes) |
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199 return res_includes, res_excludes, invalid_includes |