view doc/runrst @ 37651:950294e28136

httppeer: implement command executor for version 2 peer

Now that we have a new API for issuing commands which is compatible
with wire protocol version 2, we can start using it with wire protocol
version 2.

This commit replaces our hacky implementation of _call() with something
a bit more robust based on the new command executor interface.

We now have proper support for issuing multiple commands per HTTP
request. Each HTTP request maintains its own client reactor.

The implementation is similar to the one in the legacy wire protocol.
We use a ThreadPoolExecutor for spinning up a thread to read the HTTP
response in the background. This allows responses to resolve in any
order. While not implemented on the server yet, a client could use
concurrent.futures.as_completed() with a collection of futures and
handle responses as they arrive from the server.

The return value from issued commands is still a simple list of raw
or decoded CBOR data. This is still super hacky. We will want a rich
data type for representing command responses. But at least this
commit gets us one step closer to a proper peer implementation.

Differential Revision: https://phab.mercurial-scm.org/D3297

#!/usr/bin/env python
#
# runrst - register custom roles and run correct writer
#
# Copyright 2010 Matt Mackall <[e-mail]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

"""usage: %s WRITER args...

where WRITER is the name of a Docutils writer such as 'html' or 'manpage'
"""

import sys
try:
    from docutils.parsers.rst import roles
    from docutils.core import publish_cmdline
    from docutils import nodes, utils
except ImportError:
    sys.stderr.write("abort: couldn't generate documentation: docutils "
                     "module is missing\n")
    sys.stderr.write("please install python-docutils or see "
                     "http://docutils.sourceforge.net/\n")
    sys.exit(-1)

def role_hg(name, rawtext, text, lineno, inliner,
            options={}, content=[]):
    text = "hg " + utils.unescape(text)
    linktext = nodes.literal(rawtext, text)
    parts = text.split()
    cmd, args = parts[1], parts[2:]
    refuri = "hg.1.html#%s" % cmd
    if cmd == 'help' and args:
        if args[0] == 'config':
            # :hg:`help config`
            refuri = "hgrc.5.html"
        elif args[0].startswith('config.'):
            # :hg:`help config.SECTION...`
            refuri = "hgrc.5.html#%s" % args[0].split('.', 2)[1]
        elif len(args) >= 2 and args[0] == '-c':
            # :hg:`help -c COMMAND ...` is equivalent to :hg:`COMMAND`
            # (mainly for :hg:`help -c config`)
            refuri = "hg.1.html#%s" % args[1]
        else:
            refuri = "hg.1.html#%s" % args[0]
    node = nodes.reference(rawtext, '', linktext,
                           refuri=refuri)
    return [node], []

roles.register_local_role("hg", role_hg)

if __name__ == "__main__":
    if len(sys.argv) < 2:
        sys.stderr.write(__doc__ % sys.argv[0])
        sys.exit(1)

    writer = sys.argv[1]
    del sys.argv[1]

    publish_cmdline(writer_name=writer)