hgext/hgcia.py
author Gregory Szorc <gregory.szorc@gmail.com>
Sat, 27 Feb 2016 18:22:49 -0800
branchstable
changeset 28289 d493d64757eb
parent 26587 56b2bcea2529
permissions -rw-r--r--
hg: obtain lock when creating share from pooled repo (issue5104) There are race conditions between clients performing a shared clone to pooled storage: 1) Clients race to create the new shared repo in the pool directory 2) 1 client is seeding the repo in the pool directory and another goes to share it before it is fully cloned We prevent these race conditions by obtaining a lock in the pool directory that is derived from the name of the repo we will be accessing. To test this, a simple generic "lockdelay" extension has been added. The extension inserts an optional, configurable delay before or after lock acquisition. In the test, we delay 2 seconds after lock acquisition in the first process and 1 second before lock acquisition in the 2nd process. This means the first process has 1s to obtain the lock. There is a race condition here. If we encounter it in the wild, we could change the dummy extension to wait on the lock file to appear instead of relying on timing. But that's more complicated. Let's see what happens first.

# Copyright (C) 2007-8 Brendan Cully <brendan@kublai.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

"""hooks for integrating with the CIA.vc notification service

This is meant to be run as a changegroup or incoming hook. To
configure it, set the following options in your hgrc::

  [cia]
  # your registered CIA user name
  user = foo
  # the name of the project in CIA
  project = foo
  # the module (subproject) (optional)
  #module = foo
  # Append a diffstat to the log message (optional)
  #diffstat = False
  # Template to use for log messages (optional)
  #template = {desc}\\n{baseurl}{webroot}/rev/{node}-- {diffstat}
  # Style to use (optional)
  #style = foo
  # The URL of the CIA notification service (optional)
  # You can use mailto: URLs to send by email, e.g.
  # mailto:cia@cia.vc
  # Make sure to set email.from if you do this.
  #url = http://cia.vc/
  # print message instead of sending it (optional)
  #test = False
  # number of slashes to strip for url paths
  #strip = 0

  [hooks]
  # one of these:
  changegroup.cia = python:hgcia.hook
  #incoming.cia = python:hgcia.hook

  [web]
  # If you want hyperlinks (optional)
  baseurl = http://server/path/to/repo
"""

from mercurial.i18n import _
from mercurial.node import bin, short
from mercurial import cmdutil, patch, util, mail, error
import email.Parser

import socket, xmlrpclib
from xml.sax import saxutils
# Note for extension authors: ONLY specify testedwith = 'internal' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'internal'

socket_timeout = 30 # seconds
if util.safehasattr(socket, 'setdefaulttimeout'):
    # set a timeout for the socket so you don't have to wait so looooong
    # when cia.vc is having problems. requires python >= 2.3:
    socket.setdefaulttimeout(socket_timeout)

HGCIA_VERSION = '0.1'
HGCIA_URL = 'http://hg.kublai.com/mercurial/hgcia'


class ciamsg(object):
    """ A CIA message """
    def __init__(self, cia, ctx):
        self.cia = cia
        self.ctx = ctx
        self.url = self.cia.url
        if self.url:
            self.url += self.cia.root

    def fileelem(self, path, uri, action):
        if uri:
            uri = ' uri=%s' % saxutils.quoteattr(uri)
        return '<file%s action=%s>%s</file>' % (
            uri, saxutils.quoteattr(action), saxutils.escape(path))

    def fileelems(self):
        n = self.ctx.node()
        f = self.cia.repo.status(self.ctx.p1().node(), n)
        url = self.url or ''
        if url and url[-1] == '/':
            url = url[:-1]
        elems = []
        for path in f.modified:
            uri = '%s/diff/%s/%s' % (url, short(n), path)
            elems.append(self.fileelem(path, url and uri, 'modify'))
        for path in f.added:
            # TODO: copy/rename ?
            uri = '%s/file/%s/%s' % (url, short(n), path)
            elems.append(self.fileelem(path, url and uri, 'add'))
        for path in f.removed:
            elems.append(self.fileelem(path, '', 'remove'))

        return '\n'.join(elems)

    def sourceelem(self, project, module=None, branch=None):
        msg = ['<source>', '<project>%s</project>' % saxutils.escape(project)]
        if module:
            msg.append('<module>%s</module>' % saxutils.escape(module))
        if branch:
            msg.append('<branch>%s</branch>' % saxutils.escape(branch))
        msg.append('</source>')

        return '\n'.join(msg)

    def diffstat(self):
        class patchbuf(object):
            def __init__(self):
                self.lines = []
                # diffstat is stupid
                self.name = 'cia'
            def write(self, data):
                self.lines += data.splitlines(True)
            def close(self):
                pass

        n = self.ctx.node()
        pbuf = patchbuf()
        cmdutil.export(self.cia.repo, [n], fp=pbuf)
        return patch.diffstat(pbuf.lines) or ''

    def logmsg(self):
        if self.cia.diffstat:
            diffstat = self.diffstat()
        else:
            diffstat = ''
        self.cia.ui.pushbuffer()
        self.cia.templater.show(self.ctx, changes=self.ctx.changeset(),
                                baseurl=self.cia.ui.config('web', 'baseurl'),
                                url=self.url, diffstat=diffstat,
                                webroot=self.cia.root)
        return self.cia.ui.popbuffer()

    def xml(self):
        n = short(self.ctx.node())
        src = self.sourceelem(self.cia.project, module=self.cia.module,
                              branch=self.ctx.branch())
        # unix timestamp
        dt = self.ctx.date()
        timestamp = dt[0]

        author = saxutils.escape(self.ctx.user())
        rev = '%d:%s' % (self.ctx.rev(), n)
        log = saxutils.escape(self.logmsg())

        url = self.url
        if url and url[-1] == '/':
            url = url[:-1]
        url = url and '<url>%s/rev/%s</url>' % (saxutils.escape(url), n) or ''

        msg = """
<message>
  <generator>
    <name>Mercurial (hgcia)</name>
    <version>%s</version>
    <url>%s</url>
    <user>%s</user>
  </generator>
  %s
  <body>
    <commit>
      <author>%s</author>
      <version>%s</version>
      <log>%s</log>
      %s
      <files>%s</files>
    </commit>
  </body>
  <timestamp>%d</timestamp>
</message>
""" % \
            (HGCIA_VERSION, saxutils.escape(HGCIA_URL),
            saxutils.escape(self.cia.user), src, author, rev, log, url,
            self.fileelems(), timestamp)

        return msg


class hgcia(object):
    """ CIA notification class """

    deftemplate = '{desc}'
    dstemplate = '{desc}\n-- \n{diffstat}'

    def __init__(self, ui, repo):
        self.ui = ui
        self.repo = repo

        self.ciaurl = self.ui.config('cia', 'url', 'http://cia.vc')
        self.user = self.ui.config('cia', 'user')
        self.project = self.ui.config('cia', 'project')
        self.module = self.ui.config('cia', 'module')
        self.diffstat = self.ui.configbool('cia', 'diffstat')
        self.emailfrom = self.ui.config('email', 'from')
        self.dryrun = self.ui.configbool('cia', 'test')
        self.url = self.ui.config('web', 'baseurl')
        # Default to -1 for backward compatibility
        self.stripcount = int(self.ui.config('cia', 'strip', -1))
        self.root = self.strip(self.repo.root)

        style = self.ui.config('cia', 'style')
        template = self.ui.config('cia', 'template')
        if not template:
            if self.diffstat:
                template = self.dstemplate
            else:
                template = self.deftemplate
        t = cmdutil.changeset_templater(self.ui, self.repo, False, None,
                                        template, style, False)
        self.templater = t

    def strip(self, path):
        '''strip leading slashes from local path, turn into web-safe path.'''

        path = util.pconvert(path)
        count = self.stripcount
        if count < 0:
            return ''
        while count > 0:
            c = path.find('/')
            if c == -1:
                break
            path = path[c + 1:]
            count -= 1
        return path

    def sendrpc(self, msg):
        srv = xmlrpclib.Server(self.ciaurl)
        res = srv.hub.deliver(msg)
        if res is not True and res != 'queued.':
            raise error.Abort(_('%s returned an error: %s') %
                             (self.ciaurl, res))

    def sendemail(self, address, data):
        p = email.Parser.Parser()
        msg = p.parsestr(data)
        msg['Date'] = util.datestr(format="%a, %d %b %Y %H:%M:%S %1%2")
        msg['To'] = address
        msg['From'] = self.emailfrom
        msg['Subject'] = 'DeliverXML'
        msg['Content-type'] = 'text/xml'
        msgtext = msg.as_string()

        self.ui.status(_('hgcia: sending update to %s\n') % address)
        mail.sendmail(self.ui, util.email(self.emailfrom),
                      [address], msgtext)


def hook(ui, repo, hooktype, node=None, url=None, **kwargs):
    """ send CIA notification """
    def sendmsg(cia, ctx):
        msg = ciamsg(cia, ctx).xml()
        if cia.dryrun:
            ui.write(msg)
        elif cia.ciaurl.startswith('mailto:'):
            if not cia.emailfrom:
                raise error.Abort(_('email.from must be defined when '
                                   'sending by email'))
            cia.sendemail(cia.ciaurl[7:], msg)
        else:
            cia.sendrpc(msg)

    n = bin(node)
    cia = hgcia(ui, repo)
    if not cia.user:
        ui.debug('cia: no user specified')
        return
    if not cia.project:
        ui.debug('cia: no project specified')
        return
    if hooktype == 'changegroup':
        start = repo.changelog.rev(n)
        end = len(repo.changelog)
        for rev in xrange(start, end):
            n = repo.changelog.node(rev)
            ctx = repo.changectx(n)
            sendmsg(cia, ctx)
    else:
        ctx = repo.changectx(n)
        sendmsg(cia, ctx)