view tests/test-extension-timing.t @ 40176:41263df08109

wireprotov2: change how revisions are specified to changesetdata

Right now, we have a handful of arguments for specifying the revisions
whose data should be returned. Defining how all these arguments
interact when various combinations are present is difficult.

This commit establishes a new, generic mechanism for specifying
revisions. Instead of a hodgepodge of arguments defining things, we
have a list of dicts that specify revision selectors. The final set
of revisions is a union of all these selectors.

We implement support for specifying revisions based on:

* An explicit list of changeset revisions
* An explicit list of changeset revisions plus ancestry depth
* A DAG range between changeset roots and heads

If you squint hard enough, this problem has already been solved by
revsets. But I'm reluctant to expose revsets to the wire protocol
because that would require servers to implement a revset parser.
Plus there are security and performance implications: the set
of revision selectors needs to be narrowly and specifically tailored
for what is appropriate to be executing on a server. Perhaps there
would be a way for us to express the "parse tree" of a revset
query, for example. I'm not sure. We can explore this space another
time. For now, the new mechanism should bring sufficient flexibility
while remaining relatively simple.

The selector "types" are prefixed with "changeset" because I plan
to add manifest and file-flavored selectors as well. This will enable
us to e.g. select file revisions based on a range of changeset
revisions.

Differential Revision: https://phab.mercurial-scm.org/D4979

Test basic extension support

  $ cat > foobar.py <<EOF
  > import os
  > from mercurial import commands, registrar
  > cmdtable = {}
  > command = registrar.command(cmdtable)
  > configtable = {}
  > configitem = registrar.configitem(configtable)
  > configitem(b'tests', b'foo', default=b"Foo")
  > def uisetup(ui):
  >     ui.debug(b"uisetup called [debug]\\n")
  >     ui.write(b"uisetup called\\n")
  >     ui.status(b"uisetup called [status]\\n")
  >     ui.flush()
  > def reposetup(ui, repo):
  >     ui.write(b"reposetup called for %s\\n" % os.path.basename(repo.root))
  >     ui.write(b"ui %s= repo.ui\\n" % (ui == repo.ui and b"=" or b"!"))
  >     ui.flush()
  > @command(b'foo', [], b'hg foo')
  > def foo(ui, *args, **kwargs):
  >     foo = ui.config(b'tests', b'foo')
  >     ui.write(foo)
  >     ui.write(b"\\n")
  > @command(b'bar', [], b'hg bar', norepo=True)
  > def bar(ui, *args, **kwargs):
  >     ui.write(b"Bar\\n")
  > EOF
  $ abspath=`pwd`/foobar.py

  $ mkdir barfoo
  $ cp foobar.py barfoo/__init__.py
  $ barfoopath=`pwd`/barfoo

  $ hg init a
  $ cd a
  $ echo foo > file
  $ hg add file
  $ hg commit -m 'add file'

  $ echo '[extensions]' >> $HGRCPATH
  $ echo "foobar = $abspath" >> $HGRCPATH

Test extension setup timings

  $ hg foo --traceback --config devel.debug.extensions=yes --debug 2>&1
  debug.extensions: loading extensions
  debug.extensions: - processing 1 entries
  debug.extensions:   - loading extension: 'foobar'
  debug.extensions:   > 'foobar' extension loaded in * (glob)
  debug.extensions:     - validating extension tables: 'foobar'
  debug.extensions:     - invoking registered callbacks: 'foobar'
  debug.extensions:     > callbacks completed in * (glob)
  debug.extensions: > loaded 1 extensions, total time * (glob)
  debug.extensions: - loading configtable attributes
  debug.extensions: - executing uisetup hooks
  debug.extensions:   - running uisetup for 'foobar'
  uisetup called [debug]
  uisetup called
  uisetup called [status]
  debug.extensions:   > uisetup for 'foobar' took * (glob)
  debug.extensions: > all uisetup took * (glob)
  debug.extensions: - executing extsetup hooks
  debug.extensions:   - running extsetup for 'foobar'
  debug.extensions:   > extsetup for 'foobar' took * (glob)
  debug.extensions: > all extsetup took * (glob)
  debug.extensions: - executing remaining aftercallbacks
  debug.extensions: > remaining aftercallbacks completed in * (glob)
  debug.extensions: - loading extension registration objects
  debug.extensions: > extension registration object loading took * (glob)
  debug.extensions: > extension foobar take a total of * to load (glob)
  debug.extensions: extension loading complete
  debug.extensions: loading additional extensions
  debug.extensions: - processing 1 entries
  debug.extensions: > loaded 0 extensions, total time * (glob)
  debug.extensions: - loading configtable attributes
  debug.extensions: - executing uisetup hooks
  debug.extensions: > all uisetup took * (glob)
  debug.extensions: - executing extsetup hooks
  debug.extensions: > all extsetup took * (glob)
  debug.extensions: - executing remaining aftercallbacks
  debug.extensions: > remaining aftercallbacks completed in * (glob)
  debug.extensions: - loading extension registration objects
  debug.extensions: > extension registration object loading took * (glob)
  debug.extensions: extension loading complete
  debug.extensions: - executing reposetup hooks
  debug.extensions:   - running reposetup for foobar
  reposetup called for a
  ui == repo.ui
  debug.extensions:   > reposetup for 'foobar' took * (glob)
  debug.extensions: > all reposetup took * (glob)
  Foo

  $ cd ..

  $ echo 'foobar = !' >> $HGRCPATH