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This is an initial step towards improving BE's efficiency.
Previously, BE gets slow as the bug count increases for several
commands (e.g. `be list`), because it takes time to load the bugdir
information from disk at each invocation. If you use a remote repo
(`be --repo http://localhost:8000/ list`), the server process may have
already loaded the repo from disk, but now your listing process has to
fetch everything over the wire. This is even worse than loading it
from disk.
With the new `be serve-commands` and `be --server URL ...` pair, the
bugdir loading happens once on the server, and all the processing is
also carried out on the server. This means that calls like `be
--server http://localhost:8000/ list` will scale much better than
other methods. For example:
$ time be --server http://localhost:8000/ list > /dev/null
real 0m2.234s
user 0m0.548s
sys 0m0.114s
$ time be --server http://localhost:8000/ list > /dev/null
real 0m0.730s
user 0m0.548s
sys 0m0.112s
$ time be list > /dev/null
real 0m2.453s
user 0m2.289s
sys 0m0.166s
$ time be list > /dev/null
real 0m2.521s
user 0m2.350s
sys 0m0.172s
The first call to a cold server takes about the same time as a local
call, because you need to load the bugs from the filesystem. However,
later calls to a warm server are 3x faster, while later local calls
are still slow.
This is currently a minimal working implementation. There's a good
deal of code in libbe.command.serve that I'd like to abstract out into
a libbe.util library (since there's still a bunch of duplication
between libbe.command.serve and libbe.command.serve_commands). The
remote calls are also not as fast as I'd like, likely due to library
load times. This commit just locks in an initial working
implementation.
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It's hard to see why it wouldn't be, but .setup_command handles the
case where it's missing, so we should be consistent here.
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More Pythonic.
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This catches the test result up after:
Commit: 0d5c9c68e947617c9d073d5f19351bdd8f3866db
Author: W. Trevor King <wking@drexel.edu>
Date: Wed May 25 10:30:19 2011 -0400
Attach ImportError message to UnknownCommand to aid debugging.
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UsageError was removed back in
commit bf3d434b244c57556bec979acbc658c30eb58221
Author: W. Trevor King <wking@drexel.edu>
Date: Sat Dec 12 00:31:55 2009 -0500
Added libbe.command.base (with Command class)...
because the distinction between UsageError and UserError was unclear.
I've brought it back to satisfy a request by Christian Heinrich:
On Sun, May 01, 2011 at 02:52:13AM +0200, Christian Heinrich wrote:
> 3.) Using wrong syntax should receive better help messages.
>
> Current:
>
> "be new" -> ERROR:
> Missing required argument SUMMARY
>
> Should be:
>
> "be new" -> usage: be new [options] SUMMARY
> ...
He suggested we print the full option list as well, but I've decided
to just print the usage summary and remind the user how to get the
full help message if they want it.
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By adding command_names option to libbe.command.commands. Previous
versions of `be --complete` printed "import_xml", not "import-xml".
Also fixed libbe.command.base's doctests, so test.py can run them.
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This entailed a fairly thorough cleanup of libbe.util.id.
Remaining unimplemented completion helpers:
* complete_assigned()
* complete_extra_strings()
Since these would require scanning all (active?) bugs to compile
lists, and I was feeling lazy...
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This fixes
$ python be diff -2
Usage: be [options]
be: error: no such option: -2
and we now get the correct output
$ python be diff -2
Usage: be diff [options] [REVISION]
be: error: no such option: -2
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Also added ConnectionError pretty-print to ui.command_line, storage
version checking to BugDir.duplicate_bugdir(), and optional revision
argument to Storage.storage_version().
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Now commands automatically check for storage version compatibility.
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duplicate_bugdir() works, but for the vcs backends, it could require
shelling out for _every_ file read. This could, and probably will, be
horribly slow. Still it works ;).
I'm not sure what a better implementation would be. The old
implementation checked out the entire earlier state into a temporary
directory
pros: single shell out, simple upgrade implementation
cons: wouldn't work well for HTTP backens
I think a good solution would run along the lines of the currently
commented out code in duplicate_bugdir(), where a
VersionedStorage.changed_since(revision)
call would give you a list of changed files. diff could work off of
that directly, without the need to generate a whole duplicate bugdir.
I'm stuck on how to handle upgrades though...
Also removed trailing whitespace from all python files.
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Well, except for going through and updating the _long_help()
strings.
$ python test.py libbe.command
succeeds for everything except Diff and Subscribe, which is expected
since I haven't fixed up libbe.diff yet.
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The old
.requires_*
thing was rediculous. The new ._get_*() callbacks allow the caller
to provide a means for getting the expensive structures, which the
command can use, or not, as required. This will also make it easier
to implement the completion callbacks.
The callbacks should probably have matching .set_*() methods, to
avoid the current cache tweaking
cmd._storage = ...
etc. But that can wait for now...
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format.
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