Mercurial > hg
annotate tests/test-narrow-pull.t @ 37631:2f626233859b
wireproto: implement batching on peer executor interface
This is a bit more complicated than non-batch requests because we
need to buffer sends until the last request arrives *and* we need
to support resolving futures as data arrives from the remote.
In a classical concurrent.futures executor model, the future
"starts" as soon as it is submitted. However, we have nothing to
start until the last command is submitted.
If we did nothing, calling result() would deadlock, since the future
hasn't "started." So in the case where we queue the command, we return
a special future type whose result() will trigger sendcommands().
This eliminates the deadlock potential. It also serves as a check
against callers who may be calling result() prematurely, as it will
prevent any subsequent callcommands() from working. This behavior
is slightly annoying and a bit restrictive. But it's the world
that half duplex connections forces on us.
In order to support streaming responses, we were previously using
a generator. But with a futures-based API, we're using futures
and not generators. So in order to get streaming, we need a
background thread to read data from the server.
The approach taken in this patch is to leverage the ThreadPoolExecutor
from concurrent.futures for managing a background thread. We create
an executor and future that resolves when all response data is
processed (or an error occurs). When exiting the context manager,
we wait on that background reading before returning.
I was hoping we could manually spin up a threading.Thread and this
would be simple. But I ran into a few deadlocks when implementing.
After looking at the source code to concurrent.futures, I figured
it would just be easier to use a ThreadPoolExecutor than implement
all the code needed to manually manage a thread.
To prove this works, a use of the batch API in discovery has been
updated.
Differential Revision: https://phab.mercurial-scm.org/D3269
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 13 Apr 2018 11:02:34 -0700 |
parents | 802742769680 |
children | 576eef1ab43d |
rev | line source |
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1 $ . "$TESTDIR/narrow-library.sh" |
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2 |
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3 $ hg init master |
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4 $ cd master |
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5 $ cat >> .hg/hgrc <<EOF |
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6 > [narrow] |
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7 > serveellipses=True |
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8 > EOF |
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9 $ for x in `$TESTDIR/seq.py 10` |
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10 > do |
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11 > echo $x > "f$x" |
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12 > hg add "f$x" |
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13 > hg commit -m "Commit f$x" |
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14 > done |
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15 $ cd .. |
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16 |
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17 narrow clone a couple files, f2 and f8 |
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18 |
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19 $ hg clone --narrow ssh://user@dummy/master narrow --include "f2" --include "f8" |
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20 requesting all changes |
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21 adding changesets |
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22 adding manifests |
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23 adding file changes |
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24 added 5 changesets with 2 changes to 2 files |
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25 new changesets *:* (glob) |
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26 updating to branch default |
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27 2 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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28 $ cd narrow |
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29 $ ls |
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30 f2 |
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31 f8 |
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32 $ cat f2 f8 |
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33 2 |
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34 8 |
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35 |
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36 $ cd .. |
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37 |
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38 change every upstream file twice |
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39 |
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40 $ cd master |
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41 $ for x in `$TESTDIR/seq.py 10` |
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42 > do |
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43 > echo "update#1 $x" >> "f$x" |
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44 > hg commit -m "Update#1 to f$x" "f$x" |
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45 > done |
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46 $ for x in `$TESTDIR/seq.py 10` |
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47 > do |
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48 > echo "update#2 $x" >> "f$x" |
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49 > hg commit -m "Update#2 to f$x" "f$x" |
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50 > done |
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51 $ cd .. |
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52 |
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53 look for incoming changes |
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54 |
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55 $ cd narrow |
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56 $ hg incoming --limit 3 |
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57 comparing with ssh://user@dummy/master |
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58 searching for changes |
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59 changeset: 5:ddc055582556 |
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60 user: test |
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61 date: Thu Jan 01 00:00:00 1970 +0000 |
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62 summary: Update#1 to f1 |
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63 |
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64 changeset: 6:f66eb5ad621d |
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65 user: test |
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66 date: Thu Jan 01 00:00:00 1970 +0000 |
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67 summary: Update#1 to f2 |
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68 |
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69 changeset: 7:c42ecff04e99 |
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70 user: test |
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71 date: Thu Jan 01 00:00:00 1970 +0000 |
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72 summary: Update#1 to f3 |
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73 |
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74 |
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75 Interrupting the pull is safe |
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76 $ hg --config hooks.pretxnchangegroup.bad=false pull -q |
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77 transaction abort! |
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78 rollback completed |
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79 abort: pretxnchangegroup.bad hook exited with status 1 |
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80 [255] |
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81 $ hg id |
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82 223311e70a6f tip |
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83 |
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84 pull new changes down to the narrow clone. Should get 8 new changesets: 4 |
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85 relevant to the narrow spec, and 4 ellipsis nodes gluing them all together. |
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86 |
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87 $ hg pull |
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88 pulling from ssh://user@dummy/master |
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89 searching for changes |
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90 adding changesets |
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91 adding manifests |
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92 adding file changes |
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93 added 9 changesets with 4 changes to 2 files |
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94 new changesets *:* (glob) |
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95 (run 'hg update' to get a working copy) |
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96 $ hg log -T '{rev}: {desc}\n' |
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97 13: Update#2 to f10 |
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98 12: Update#2 to f8 |
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99 11: Update#2 to f7 |
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100 10: Update#2 to f2 |
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101 9: Update#2 to f1 |
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102 8: Update#1 to f8 |
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103 7: Update#1 to f7 |
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104 6: Update#1 to f2 |
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105 5: Update#1 to f1 |
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106 4: Commit f10 |
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107 3: Commit f8 |
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108 2: Commit f7 |
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109 1: Commit f2 |
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110 0: Commit f1 |
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111 $ hg update tip |
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112 2 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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113 |
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114 add a change and push it |
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115 |
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116 $ echo "update#3 2" >> f2 |
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117 $ hg commit -m "Update#3 to f2" f2 |
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118 $ hg log f2 -T '{rev}: {desc}\n' |
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119 14: Update#3 to f2 |
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120 10: Update#2 to f2 |
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121 6: Update#1 to f2 |
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122 1: Commit f2 |
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123 $ hg push |
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124 pushing to ssh://user@dummy/master |
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125 searching for changes |
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126 remote: adding changesets |
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127 remote: adding manifests |
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128 remote: adding file changes |
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129 remote: added 1 changesets with 1 changes to 1 files |
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130 $ cd .. |
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131 |
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132 $ cd master |
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133 $ hg log f2 -T '{rev}: {desc}\n' |
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134 30: Update#3 to f2 |
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135 21: Update#2 to f2 |
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136 11: Update#1 to f2 |
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137 1: Commit f2 |
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138 $ hg log -l 3 -T '{rev}: {desc}\n' |
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139 30: Update#3 to f2 |
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140 29: Update#2 to f10 |
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141 28: Update#2 to f9 |
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142 |
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143 Can pull into repo with a single commit |
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144 |
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145 $ cd .. |
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146 $ hg clone -q --narrow ssh://user@dummy/master narrow2 --include "f1" -r 0 |
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147 $ cd narrow2 |
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148 $ hg pull -q -r 1 |
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149 transaction abort! |
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150 rollback completed |
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151 abort: pull failed on remote |
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152 [255] |
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153 |
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154 Can use 'hg share': |
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155 $ cat >> $HGRCPATH <<EOF |
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156 > [extensions] |
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157 > share= |
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158 > EOF |
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159 |
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160 $ cd .. |
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161 $ hg share narrow2 narrow2-share |
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162 updating working directory |
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163 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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164 $ cd narrow2-share |
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165 $ hg status |
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166 |
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167 We should also be able to unshare without breaking everything: |
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168 $ hg unshare |
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169 devel-warn: write with no wlock: "narrowspec" at: */hgext/narrow/narrowrepo.py:* (unsharenarrowspec) (glob) |
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170 $ hg verify |
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171 checking changesets |
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172 checking manifests |
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173 crosschecking files in changesets and manifests |
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174 checking files |
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175 1 files, 1 changesets, 1 total revisions |