Mercurial > hg
annotate hgext/logtoprocess.py @ 39772:ae531f5e583c
testing: add interface unit tests for file storage
Our strategy for supporting alternate storage backends is to define
interfaces for everything then "code to the interface."
We already have interfaces for various primitives, including file
and manifest storage.
What we don't have is generic unit tests for those interfaces. Up
to this point we've been relying on high-level integration tests
(mainly in the form of existing .t tests) to test alternate storage
backends. And my experience with developing the "simple store" test
extension is that such testing is very tedious: it takes several
minutes to run all tests and when you find a failure, it is often
non-trivial to debug.
This commit starts to change that.
This commit introduces the mercurial.testing.storage module. It
contains testing code for storage. Currently, it defines some
unittest.TestCase classes for testing the file storage interfaces.
It also defines some factory functions that allow a caller to easily
spawn a custom TestCase "bound" to a specific file storage backend
implementation.
A new .py test has been added. It simply defines a callable to produce
filelog and transaction instances on demand and then "registers" the
various test classes so the filelog class can be tested with the
storage interface unit tests.
As part of writing the tests, I identified a couple of apparent
bugs in revlog.py and filelog.py! These are tracked with inline
TODO comments.
Writing the tests makes it more obvious where the storage interface
is lacking. For example, we raise either IndexError or
error.LookupError for missing revisions depending on whether we
use an integer revision or a node. Also, we raise error.RevlogError
in various places when we should be raising a storage-agnostic
error type.
The storage interfaces are currently far from perfect and there is much
work to be done to improve them. But at least with this commit we
finally have the start of unit tests that can be used to "qualify"
the behavior of a storage backend. And when implementing and debugging
new storage backends, we now have an obvious place to define new
tests and have obvious places to insert breakpoints to facilitate
debugging. This should be invaluable when implementing new storage
backends.
I added the mercurial.testing package because these interface
conformance tests are generic and need to be usable by all storage
backends. Having the code live in tests/ would make it difficult for
storage backends implemented in extensions to test their interface
conformance. First, it would require obtaining a copy of Mercurial's
storage test code in order to test. Second, it would make testing
against multiple Mercurial versions difficult, as you would need to
import N copies of the storage testing code in order to achieve test
coverage. By making the test code part of the Mercurial distribution
itself, extensions can `import mercurial.testing.*` to access and run
the test code. The test will run against whatever Mercurial version
is active.
FWIW I've always wanted to move parts of run-tests.py into the
mercurial.* package to make the testing story simpler (e.g. imagine an
`hg debugruntests` command that could invoke the test harness). While I
have no plans to do that in the near future, establishing the
mercurial.testing package does provide a natural home for that code
should someone do this in the future.
Differential Revision: https://phab.mercurial-scm.org/D4650
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 18 Sep 2018 16:52:11 -0700 |
parents | 52790352dd05 |
children | c31ce080eb75 |
rev | line source |
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1 # logtoprocess.py - send ui.log() data to a subprocess |
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2 # |
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3 # Copyright 2016 Facebook, 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 """send ui.log() data to a subprocess (EXPERIMENTAL) |
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8 |
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9 This extension lets you specify a shell command per ui.log() event, |
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10 sending all remaining arguments to as environment variables to that command. |
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11 |
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12 Each positional argument to the method results in a `MSG[N]` key in the |
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13 environment, starting at 1 (so `MSG1`, `MSG2`, etc.). Each keyword argument |
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14 is set as a `OPT_UPPERCASE_KEY` variable (so the key is uppercased, and |
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15 prefixed with `OPT_`). The original event name is passed in the `EVENT` |
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16 environment variable, and the process ID of mercurial is given in `HGPID`. |
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17 |
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18 So given a call `ui.log('foo', 'bar', 'baz', spam='eggs'), a script configured |
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19 for the `foo` event can expect an environment with `MSG1=bar`, `MSG2=baz`, and |
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20 `OPT_SPAM=eggs`. |
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21 |
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22 Scripts are configured in the `[logtoprocess]` section, each key an event name. |
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23 For example:: |
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24 |
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25 [logtoprocess] |
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26 commandexception = echo "$MSG2$MSG3" > /var/log/mercurial_exceptions.log |
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27 |
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28 would log the warning message and traceback of any failed command dispatch. |
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29 |
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30 Scripts are run asynchronously as detached daemon processes; mercurial will |
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31 not ensure that they exit cleanly. |
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32 |
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33 """ |
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34 |
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35 from __future__ import absolute_import |
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36 |
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37 import itertools |
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38 import os |
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39 import subprocess |
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40 import sys |
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41 |
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42 from mercurial import ( |
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43 encoding, |
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44 pycompat, |
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45 ) |
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46 |
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47 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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48 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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49 # be specifying the version(s) of Mercurial they are tested with, or |
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50 # leave the attribute unspecified. |
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51 testedwith = 'ships-with-hg-core' |
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52 |
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53 def uisetup(ui): |
34645 | 54 if pycompat.iswindows: |
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55 # no fork on Windows, but we can create a detached process |
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56 # https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863.aspx |
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57 # No stdlib constant exists for this value |
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58 DETACHED_PROCESS = 0x00000008 |
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59 _creationflags = DETACHED_PROCESS | subprocess.CREATE_NEW_PROCESS_GROUP |
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60 |
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61 def runshellcommand(script, env): |
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62 # we can't use close_fds *and* redirect stdin. I'm not sure that we |
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63 # need to because the detached process has no console connection. |
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64 subprocess.Popen( |
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65 script, shell=True, env=env, close_fds=True, |
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66 creationflags=_creationflags) |
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67 else: |
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68 def runshellcommand(script, env): |
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69 # double-fork to completely detach from the parent process |
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70 # based on http://code.activestate.com/recipes/278731 |
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71 pid = os.fork() |
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72 if pid: |
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73 # parent |
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74 return |
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75 # subprocess.Popen() forks again, all we need to add is |
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76 # flag the new process as a new session. |
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77 if sys.version_info < (3, 2): |
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78 newsession = {'preexec_fn': os.setsid} |
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79 else: |
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80 newsession = {'start_new_session': True} |
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81 try: |
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82 # connect stdin to devnull to make sure the subprocess can't |
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83 # muck up that stream for mercurial. |
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84 subprocess.Popen( |
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85 script, shell=True, stdin=open(os.devnull, 'r'), env=env, |
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86 close_fds=True, **newsession) |
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87 finally: |
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88 # mission accomplished, this child needs to exit and not |
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89 # continue the hg process here. |
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90 os._exit(0) |
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91 |
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92 class logtoprocessui(ui.__class__): |
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93 def log(self, event, *msg, **opts): |
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94 """Map log events to external commands |
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95 |
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96 Arguments are passed on as environment variables. |
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97 |
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98 """ |
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99 script = self.config('logtoprocess', event) |
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100 if script: |
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101 if msg: |
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102 # try to format the log message given the remaining |
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103 # arguments |
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104 try: |
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105 # Python string formatting with % either uses a |
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106 # dictionary *or* tuple, but not both. If we have |
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107 # keyword options, assume we need a mapping. |
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108 formatted = msg[0] % (opts or msg[1:]) |
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109 except (TypeError, KeyError): |
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110 # Failed to apply the arguments, ignore |
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111 formatted = msg[0] |
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112 messages = (formatted,) + msg[1:] |
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113 else: |
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114 messages = msg |
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115 # positional arguments are listed as MSG[N] keys in the |
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116 # environment |
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117 msgpairs = ( |
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118 ('MSG{0:d}'.format(i), str(m)) |
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119 for i, m in enumerate(messages, 1)) |
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120 # keyword arguments get prefixed with OPT_ and uppercased |
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121 optpairs = ( |
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122 ('OPT_{0}'.format(key.upper()), str(value)) |
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123 for key, value in opts.iteritems()) |
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124 env = dict(itertools.chain(encoding.environ.items(), |
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125 msgpairs, optpairs), |
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126 EVENT=event, HGPID=str(os.getpid())) |
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127 runshellcommand(script, env) |
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128 return super(logtoprocessui, self).log(event, *msg, **opts) |
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129 |
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130 # Replace the class for this instance and all clones created from it: |
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131 ui.__class__ = logtoprocessui |