Mercurial > hg
annotate mercurial/commandserver.py @ 29375:fcaf20175b1b
demandimport: delay loading for "from a import b" with absolute_import
Before this patch, "from a import b" doesn't delay loading module "b",
if absolute_import is enabled, even though "from . import b" does.
For example:
- it is assumed that extension X has "from P import M" for module M
under package P with absolute_import feature
- if importing module M is already delayed before loading extension
X, loading module M in extension X is delayed until actually
referring
util, cmdutil, scmutil or so of Mercurial itself should be
imported by "from . import M" style before loading extension X
- otherwise, module M is loaded immediately at loading extension X,
even if extension X itself isn't used at that "hg" command invocation
Some minor modules (e.g. filemerge or so) of Mercurial itself
aren't imported by "from . import M" style before loading
extension X. And of course, external libraries aren't, too.
This might cause startup performance problem of hg command, because
many bundled extensions already enable absolute_import feature.
To delay loading module for "from a import b" with absolute_import
feature, this patch does below in "from a (or .a) import b" with
absolute_import case:
1. import root module of "name" by system built-in __import__
(referred as _origimport)
2. recurse down the module chain for hierarchical "name"
This logic can be shared with non absolute_import
case. Therefore, this patch also centralizes it into chainmodules().
3. and fall through to process elements in "fromlist" for the leaf
module of "name"
Processing elements in "fromlist" is executed in the code path
after "if _pypy: .... else: ..." clause. Therefore, this patch
replaces "if _pypy:" with "elif _pypy:" to share it.
At 4f1144c3c72b introducing original "work around" for "from a import
b" case, elements in "fromlist" were imported with "level=level". But
"level" might be grater than 1 (e.g. level=2 in "from .. import b"
case) at demandimport() invocation, and importing direct sub-module in
"fromlist" with level grater than 1 causes unexpected result.
IMHO, this seems main reason of "errors for unknown reason" described
in 4f1144c3c72b, and we don't have to worry about it, because this
issue was already fixed by 78d05778907b.
This is reason why this patch removes "errors for unknown reasons"
comment.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
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date | Sun, 19 Jun 2016 02:17:33 +0900 |
parents | d269e7db2f55 |
children | 33770d2b6cf9 |
rev | line source |
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1 # commandserver.py - communicate with Mercurial's API over a pipe |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> |
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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 SocketServer |
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11 import errno |
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12 import os |
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13 import struct |
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14 import sys |
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15 import traceback |
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16 |
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17 from .i18n import _ |
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18 from . import ( |
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19 encoding, |
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20 error, |
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21 util, |
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22 ) |
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23 |
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24 logfile = None |
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25 |
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26 def log(*args): |
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27 if not logfile: |
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28 return |
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29 |
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30 for a in args: |
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31 logfile.write(str(a)) |
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32 |
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33 logfile.flush() |
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34 |
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35 class channeledoutput(object): |
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36 """ |
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37 Write data to out in the following format: |
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38 |
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39 data length (unsigned int), |
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40 data |
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41 """ |
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42 def __init__(self, out, channel): |
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43 self.out = out |
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44 self.channel = channel |
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45 |
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46 @property |
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47 def name(self): |
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48 return '<%c-channel>' % self.channel |
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49 |
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50 def write(self, data): |
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51 if not data: |
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52 return |
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53 self.out.write(struct.pack('>cI', self.channel, len(data))) |
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54 self.out.write(data) |
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55 self.out.flush() |
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56 |
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57 def __getattr__(self, attr): |
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58 if attr in ('isatty', 'fileno', 'tell', 'seek'): |
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59 raise AttributeError(attr) |
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60 return getattr(self.out, attr) |
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61 |
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62 class channeledinput(object): |
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63 """ |
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64 Read data from in_. |
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65 |
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66 Requests for input are written to out in the following format: |
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67 channel identifier - 'I' for plain input, 'L' line based (1 byte) |
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68 how many bytes to send at most (unsigned int), |
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69 |
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70 The client replies with: |
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71 data length (unsigned int), 0 meaning EOF |
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72 data |
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73 """ |
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74 |
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75 maxchunksize = 4 * 1024 |
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76 |
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77 def __init__(self, in_, out, channel): |
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78 self.in_ = in_ |
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79 self.out = out |
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80 self.channel = channel |
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81 |
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82 @property |
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83 def name(self): |
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84 return '<%c-channel>' % self.channel |
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85 |
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86 def read(self, size=-1): |
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87 if size < 0: |
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88 # if we need to consume all the clients input, ask for 4k chunks |
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89 # so the pipe doesn't fill up risking a deadlock |
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90 size = self.maxchunksize |
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91 s = self._read(size, self.channel) |
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92 buf = s |
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93 while s: |
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94 s = self._read(size, self.channel) |
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95 buf += s |
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96 |
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97 return buf |
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98 else: |
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99 return self._read(size, self.channel) |
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100 |
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101 def _read(self, size, channel): |
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102 if not size: |
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103 return '' |
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104 assert size > 0 |
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105 |
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106 # tell the client we need at most size bytes |
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107 self.out.write(struct.pack('>cI', channel, size)) |
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108 self.out.flush() |
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109 |
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110 length = self.in_.read(4) |
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111 length = struct.unpack('>I', length)[0] |
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112 if not length: |
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113 return '' |
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114 else: |
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115 return self.in_.read(length) |
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116 |
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117 def readline(self, size=-1): |
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118 if size < 0: |
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119 size = self.maxchunksize |
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120 s = self._read(size, 'L') |
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121 buf = s |
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122 # keep asking for more until there's either no more or |
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123 # we got a full line |
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124 while s and s[-1] != '\n': |
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125 s = self._read(size, 'L') |
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126 buf += s |
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127 |
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128 return buf |
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129 else: |
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130 return self._read(size, 'L') |
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131 |
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132 def __iter__(self): |
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133 return self |
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134 |
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135 def next(self): |
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136 l = self.readline() |
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137 if not l: |
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138 raise StopIteration |
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139 return l |
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140 |
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141 def __getattr__(self, attr): |
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142 if attr in ('isatty', 'fileno', 'tell', 'seek'): |
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143 raise AttributeError(attr) |
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144 return getattr(self.in_, attr) |
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145 |
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146 class server(object): |
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147 """ |
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148 Listens for commands on fin, runs them and writes the output on a channel |
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149 based stream to fout. |
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150 """ |
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151 def __init__(self, ui, repo, fin, fout): |
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152 self.cwd = os.getcwd() |
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153 |
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154 # developer config: cmdserver.log |
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155 logpath = ui.config("cmdserver", "log", None) |
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156 if logpath: |
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157 global logfile |
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158 if logpath == '-': |
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159 # write log on a special 'd' (debug) channel |
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160 logfile = channeledoutput(fout, 'd') |
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161 else: |
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162 logfile = open(logpath, 'a') |
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163 |
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164 if repo: |
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165 # the ui here is really the repo ui so take its baseui so we don't |
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166 # end up with its local configuration |
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167 self.ui = repo.baseui |
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168 self.repo = repo |
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169 self.repoui = repo.ui |
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170 else: |
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171 self.ui = ui |
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172 self.repo = self.repoui = None |
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173 |
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174 self.cerr = channeledoutput(fout, 'e') |
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175 self.cout = channeledoutput(fout, 'o') |
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176 self.cin = channeledinput(fin, fout, 'I') |
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177 self.cresult = channeledoutput(fout, 'r') |
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178 |
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179 self.client = fin |
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180 |
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181 def _read(self, size): |
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182 if not size: |
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183 return '' |
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184 |
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185 data = self.client.read(size) |
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186 |
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187 # is the other end closed? |
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188 if not data: |
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189 raise EOFError |
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190 |
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191 return data |
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192 |
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193 def _readstr(self): |
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194 """read a string from the channel |
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195 |
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196 format: |
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197 data length (uint32), data |
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198 """ |
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199 length = struct.unpack('>I', self._read(4))[0] |
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200 if not length: |
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201 return '' |
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202 return self._read(length) |
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203 |
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204 def _readlist(self): |
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205 """read a list of NULL separated strings from the channel""" |
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206 s = self._readstr() |
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207 if s: |
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208 return s.split('\0') |
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209 else: |
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210 return [] |
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211 |
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212 def runcommand(self): |
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213 """ reads a list of \0 terminated arguments, executes |
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214 and writes the return code to the result channel """ |
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215 from . import dispatch # avoid cycle |
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216 |
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218 |
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219 # copy the uis so changes (e.g. --config or --verbose) don't |
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220 # persist between requests |
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221 copiedui = self.ui.copy() |
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222 uis = [copiedui] |
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223 if self.repo: |
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224 self.repo.baseui = copiedui |
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225 # clone ui without using ui.copy because this is protected |
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226 repoui = self.repoui.__class__(self.repoui) |
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227 repoui.copy = copiedui.copy # redo copy protection |
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228 uis.append(repoui) |
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229 self.repo.ui = self.repo.dirstate._ui = repoui |
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230 self.repo.invalidateall() |
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231 |
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232 for ui in uis: |
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233 ui.resetstate() |
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234 # any kind of interaction must use server channels, but chg may |
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235 # replace channels by fully functional tty files. so nontty is |
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236 # enforced only if cin is a channel. |
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237 if not util.safehasattr(self.cin, 'fileno'): |
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238 ui.setconfig('ui', 'nontty', 'true', 'commandserver') |
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239 |
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240 req = dispatch.request(args[:], copiedui, self.repo, self.cin, |
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241 self.cout, self.cerr) |
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242 |
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243 ret = (dispatch.dispatch(req) or 0) & 255 # might return None |
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244 |
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245 # restore old cwd |
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246 if '--cwd' in args: |
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247 os.chdir(self.cwd) |
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248 |
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249 self.cresult.write(struct.pack('>i', int(ret))) |
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250 |
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251 def getencoding(self): |
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252 """ writes the current encoding to the result channel """ |
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253 self.cresult.write(encoding.encoding) |
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254 |
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255 def serveone(self): |
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256 cmd = self.client.readline()[:-1] |
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257 if cmd: |
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258 handler = self.capabilities.get(cmd) |
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259 if handler: |
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260 handler(self) |
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261 else: |
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262 # clients are expected to check what commands are supported by |
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263 # looking at the servers capabilities |
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264 raise error.Abort(_('unknown command %s') % cmd) |
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265 |
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266 return cmd != '' |
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267 |
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268 capabilities = {'runcommand' : runcommand, |
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269 'getencoding' : getencoding} |
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270 |
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271 def serve(self): |
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272 hellomsg = 'capabilities: ' + ' '.join(sorted(self.capabilities)) |
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273 hellomsg += '\n' |
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274 hellomsg += 'encoding: ' + encoding.encoding |
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275 hellomsg += '\n' |
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276 hellomsg += 'pid: %d' % util.getpid() |
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277 |
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278 # write the hello msg in -one- chunk |
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279 self.cout.write(hellomsg) |
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280 |
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281 try: |
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282 while self.serveone(): |
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283 pass |
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284 except EOFError: |
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285 # we'll get here if the client disconnected while we were reading |
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286 # its request |
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287 return 1 |
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288 |
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289 return 0 |
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290 |
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291 def _protectio(ui): |
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292 """ duplicates streams and redirect original to null if ui uses stdio """ |
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293 ui.flush() |
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294 newfiles = [] |
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295 nullfd = os.open(os.devnull, os.O_RDWR) |
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296 for f, sysf, mode in [(ui.fin, sys.stdin, 'rb'), |
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297 (ui.fout, sys.stdout, 'wb')]: |
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298 if f is sysf: |
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299 newfd = os.dup(f.fileno()) |
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300 os.dup2(nullfd, f.fileno()) |
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301 f = os.fdopen(newfd, mode) |
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302 newfiles.append(f) |
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303 os.close(nullfd) |
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304 return tuple(newfiles) |
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305 |
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306 def _restoreio(ui, fin, fout): |
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307 """ restores streams from duplicated ones """ |
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308 ui.flush() |
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309 for f, uif in [(fin, ui.fin), (fout, ui.fout)]: |
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310 if f is not uif: |
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311 os.dup2(f.fileno(), uif.fileno()) |
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312 f.close() |
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313 |
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314 class pipeservice(object): |
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315 def __init__(self, ui, repo, opts): |
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316 self.ui = ui |
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317 self.repo = repo |
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318 |
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319 def init(self): |
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320 pass |
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321 |
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322 def run(self): |
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323 ui = self.ui |
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324 # redirect stdio to null device so that broken extensions or in-process |
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325 # hooks will never cause corruption of channel protocol. |
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326 fin, fout = _protectio(ui) |
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327 try: |
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328 sv = server(ui, self.repo, fin, fout) |
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329 return sv.serve() |
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330 finally: |
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331 _restoreio(ui, fin, fout) |
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332 |
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333 class _requesthandler(SocketServer.StreamRequestHandler): |
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334 def handle(self): |
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335 ui = self.server.ui |
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336 repo = self.server.repo |
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337 sv = None |
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338 try: |
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339 sv = server(ui, repo, self.rfile, self.wfile) |
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340 try: |
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341 sv.serve() |
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342 # handle exceptions that may be raised by command server. most of |
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343 # known exceptions are caught by dispatch. |
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344 except error.Abort as inst: |
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345 ui.warn(_('abort: %s\n') % inst) |
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346 except IOError as inst: |
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347 if inst.errno != errno.EPIPE: |
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348 raise |
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349 except KeyboardInterrupt: |
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350 pass |
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351 except: # re-raises |
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352 # also write traceback to error channel. otherwise client cannot |
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353 # see it because it is written to server's stderr by default. |
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354 if sv: |
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355 cerr = sv.cerr |
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356 else: |
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357 cerr = channeledoutput(self.wfile, 'e') |
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358 traceback.print_exc(file=cerr) |
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359 raise |
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360 |
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361 class unixservice(object): |
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362 """ |
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363 Listens on unix domain socket and forks server per connection |
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364 """ |
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365 def __init__(self, ui, repo, opts): |
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366 self.ui = ui |
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367 self.repo = repo |
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368 self.address = opts['address'] |
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369 if not util.safehasattr(SocketServer, 'UnixStreamServer'): |
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370 raise error.Abort(_('unsupported platform')) |
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371 if not self.address: |
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372 raise error.Abort(_('no socket path specified with --address')) |
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373 |
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374 def init(self): |
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375 class cls(SocketServer.ForkingMixIn, SocketServer.UnixStreamServer): |
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376 ui = self.ui |
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377 repo = self.repo |
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378 self.server = cls(self.address, _requesthandler) |
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379 self.ui.status(_('listening at %s\n') % self.address) |
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380 self.ui.flush() # avoid buffering of status message |
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381 |
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382 def run(self): |
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383 try: |
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384 self.server.serve_forever() |
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385 finally: |
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386 os.unlink(self.address) |
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387 |
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388 _servicemap = { |
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389 'pipe': pipeservice, |
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390 'unix': unixservice, |
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391 } |
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392 |
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393 def createservice(ui, repo, opts): |
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394 mode = opts['cmdserver'] |
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395 try: |
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396 return _servicemap[mode](ui, repo, opts) |
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397 except KeyError: |
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398 raise error.Abort(_('unknown mode %s') % mode) |