# bugzilla.py - bugzilla integration for mercurial
#
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

'''Bugzilla integration

This hook extension adds comments on bugs in Bugzilla when changesets
that refer to bugs by Bugzilla ID are seen. The hook does not change bug
status.

The hook updates the Bugzilla database directly. Only Bugzilla installations
using MySQL are supported.

The hook relies on a Bugzilla script to send bug change notification emails.
That script changes between Bugzilla versions; the 'processmail' script used
prior to 2.18 is replaced in 2.18 and subsequent versions by
'config/sendbugmail.pl'. Note that these will be run by Mercurial as the user
pushing the change; you will need to ensure the Bugzilla install file
permissions are set appropriately.

Configuring the extension:

    [bugzilla]
    host       Hostname of the MySQL server holding the Bugzilla database.
    db         Name of the Bugzilla database in MySQL. Default 'bugs'.
    user       Username to use to access MySQL server. Default 'bugs'.
    password   Password to use to access MySQL server.
    timeout    Database connection timeout (seconds). Default 5.
    version    Bugzilla version. Specify '3.0' for Bugzilla versions 3.0 and
               later, '2.18' for Bugzilla versions from 2.18 and '2.16' for
               versions prior to 2.18.
    bzuser     Fallback Bugzilla user name to record comments with, if
               changeset committer cannot be found as a Bugzilla user.
    bzdir      Bugzilla install directory. Used by default notify.
               Default '/var/www/html/bugzilla'.
    notify     The command to run to get Bugzilla to send bug change
               notification emails. Substitutes from a map with 3 keys,
               'bzdir', 'id' (bug id) and 'user' (committer bugzilla email).
               Default depends on version; from 2.18 it is
               "cd %(bzdir)s && perl -T contrib/sendbugmail.pl %(id)s %(user)s".
    regexp     Regular expression to match bug IDs in changeset commit message.
               Must contain one "()" group. The default expression matches
               'Bug 1234', 'Bug no. 1234', 'Bug number 1234',
               'Bugs 1234,5678', 'Bug 1234 and 5678' and variations thereof.
               Matching is case insensitive.
    style      The style file to use when formatting comments.
    template   Template to use when formatting comments. Overrides
               style if specified. In addition to the usual Mercurial
               keywords, the extension specifies:
                   {bug}       The Bugzilla bug ID.
                   {root}      The full pathname of the Mercurial repository.
                   {webroot}   Stripped pathname of the Mercurial repository.
                   {hgweb}     Base URL for browsing Mercurial repositories.
               Default 'changeset {node|short} in repo {root} refers '
                       'to bug {bug}.\\ndetails:\\n\\t{desc|tabindent}'
    strip      The number of slashes to strip from the front of {root}
               to produce {webroot}. Default 0.
    usermap    Path of file containing Mercurial committer ID to Bugzilla user
               ID mappings. If specified, the file should contain one mapping
               per line, "committer"="Bugzilla user". See also the
               [usermap] section.

    [usermap]
    Any entries in this section specify mappings of Mercurial committer ID
    to Bugzilla user ID. See also [bugzilla].usermap.
    "committer"="Bugzilla user"

    [web]
    baseurl    Base URL for browsing Mercurial repositories. Reference from
               templates as {hgweb}.

Activating the extension:

    [extensions]
    hgext.bugzilla =

    [hooks]
    # run bugzilla hook on every change pulled or pushed in here
    incoming.bugzilla = python:hgext.bugzilla.hook

Example configuration:

This example configuration is for a collection of Mercurial repositories
in /var/local/hg/repos/ used with a local Bugzilla 3.2 installation in
/opt/bugzilla-3.2.

    [bugzilla]
    host=localhost
    password=XYZZY
    version=3.0
    bzuser=unknown@domain.com
    bzdir=/opt/bugzilla-3.2
    template=Changeset {node|short} in {root|basename}.\\n{hgweb}/{webroot}/rev/{node|short}\\n\\n{desc}\\n
    strip=5

    [web]
    baseurl=http://dev.domain.com/hg

    [usermap]
    user@emaildomain.com=user.name@bugzilladomain.com

Commits add a comment to the Bugzilla bug record of the form:

    Changeset 3b16791d6642 in repository-name.
    http://dev.domain.com/hg/repository-name/rev/3b16791d6642

    Changeset commit comment. Bug 1234.
'''

from mercurial.i18n import _
from mercurial.node import short
from mercurial import cmdutil, templater, util
import re, time

MySQLdb = None

def buglist(ids):
    return '(' + ','.join(map(str, ids)) + ')'

class bugzilla_2_16(object):
    '''support for bugzilla version 2.16.'''

    def __init__(self, ui):
        self.ui = ui
        host = self.ui.config('bugzilla', 'host', 'localhost')
        user = self.ui.config('bugzilla', 'user', 'bugs')
        passwd = self.ui.config('bugzilla', 'password')
        db = self.ui.config('bugzilla', 'db', 'bugs')
        timeout = int(self.ui.config('bugzilla', 'timeout', 5))
        usermap = self.ui.config('bugzilla', 'usermap')
        if usermap:
            self.ui.readsections(usermap, 'usermap')
        self.ui.note(_('connecting to %s:%s as %s, password %s\n') %
                     (host, db, user, '*' * len(passwd)))
        self.conn = MySQLdb.connect(host=host, user=user, passwd=passwd,
                                    db=db, connect_timeout=timeout)
        self.cursor = self.conn.cursor()
        self.longdesc_id = self.get_longdesc_id()
        self.user_ids = {}
        self.default_notify = "cd %(bzdir)s && ./processmail %(id)s %(user)s"

    def run(self, *args, **kwargs):
        '''run a query.'''
        self.ui.note(_('query: %s %s\n') % (args, kwargs))
        try:
            self.cursor.execute(*args, **kwargs)
        except MySQLdb.MySQLError:
            self.ui.note(_('failed query: %s %s\n') % (args, kwargs))
            raise

    def get_longdesc_id(self):
        '''get identity of longdesc field'''
        self.run('select fieldid from fielddefs where name = "longdesc"')
        ids = self.cursor.fetchall()
        if len(ids) != 1:
            raise util.Abort(_('unknown database schema'))
        return ids[0][0]

    def filter_real_bug_ids(self, ids):
        '''filter not-existing bug ids from list.'''
        self.run('select bug_id from bugs where bug_id in %s' % buglist(ids))
        return util.sort([c[0] for c in self.cursor.fetchall()])

    def filter_unknown_bug_ids(self, node, ids):
        '''filter bug ids from list that already refer to this changeset.'''

        self.run('''select bug_id from longdescs where
                    bug_id in %s and thetext like "%%%s%%"''' %
                 (buglist(ids), short(node)))
        unknown = dict.fromkeys(ids)
        for (id,) in self.cursor.fetchall():
            self.ui.status(_('bug %d already knows about changeset %s\n') %
                           (id, short(node)))
            unknown.pop(id, None)
        return util.sort(unknown.keys())

    def notify(self, ids, committer):
        '''tell bugzilla to send mail.'''

        self.ui.status(_('telling bugzilla to send mail:\n'))
        (user, userid) = self.get_bugzilla_user(committer)
        for id in ids:
            self.ui.status(_('  bug %s\n') % id)
            cmdfmt = self.ui.config('bugzilla', 'notify', self.default_notify)
            bzdir = self.ui.config('bugzilla', 'bzdir', '/var/www/html/bugzilla')
            try:
                # Backwards-compatible with old notify string, which
                # took one string. This will throw with a new format
                # string.
                cmd = cmdfmt % id
            except TypeError:
                cmd = cmdfmt % {'bzdir': bzdir, 'id': id, 'user': user}
            self.ui.note(_('running notify command %s\n') % cmd)
            fp = util.popen('(%s) 2>&1' % cmd)
            out = fp.read()
            ret = fp.close()
            if ret:
                self.ui.warn(out)
                raise util.Abort(_('bugzilla notify command %s') %
                                 util.explain_exit(ret)[0])
        self.ui.status(_('done\n'))

    def get_user_id(self, user):
        '''look up numeric bugzilla user id.'''
        try:
            return self.user_ids[user]
        except KeyError:
            try:
                userid = int(user)
            except ValueError:
                self.ui.note(_('looking up user %s\n') % user)
                self.run('''select userid from profiles
                            where login_name like %s''', user)
                all = self.cursor.fetchall()
                if len(all) != 1:
                    raise KeyError(user)
                userid = int(all[0][0])
            self.user_ids[user] = userid
            return userid

    def map_committer(self, user):
        '''map name of committer to bugzilla user name.'''
        for committer, bzuser in self.ui.configitems('usermap'):
            if committer.lower() == user.lower():
                return bzuser
        return user

    def get_bugzilla_user(self, committer):
        '''see if committer is a registered bugzilla user. Return
        bugzilla username and userid if so. If not, return default
        bugzilla username and userid.'''
        user = self.map_committer(committer)
        try:
            userid = self.get_user_id(user)
        except KeyError:
            try:
                defaultuser = self.ui.config('bugzilla', 'bzuser')
                if not defaultuser:
                    raise util.Abort(_('cannot find bugzilla user id for %s') %
                                     user)
                userid = self.get_user_id(defaultuser)
                user = defaultuser
            except KeyError:
                raise util.Abort(_('cannot find bugzilla user id for %s or %s') %
                                 (user, defaultuser))
        return (user, userid)

    def add_comment(self, bugid, text, committer):
        '''add comment to bug. try adding comment as committer of
        changeset, otherwise as default bugzilla user.'''
        (user, userid) = self.get_bugzilla_user(committer)
        now = time.strftime('%Y-%m-%d %H:%M:%S')
        self.run('''insert into longdescs
                    (bug_id, who, bug_when, thetext)
                    values (%s, %s, %s, %s)''',
                 (bugid, userid, now, text))
        self.run('''insert into bugs_activity (bug_id, who, bug_when, fieldid)
                    values (%s, %s, %s, %s)''',
                 (bugid, userid, now, self.longdesc_id))
        self.conn.commit()

class bugzilla_2_18(bugzilla_2_16):
    '''support for bugzilla 2.18 series.'''

    def __init__(self, ui):
        bugzilla_2_16.__init__(self, ui)
        self.default_notify = "cd %(bzdir)s && perl -T contrib/sendbugmail.pl %(id)s %(user)s"

class bugzilla_3_0(bugzilla_2_18):
    '''support for bugzilla 3.0 series.'''

    def __init__(self, ui):
        bugzilla_2_18.__init__(self, ui)

    def get_longdesc_id(self):
        '''get identity of longdesc field'''
        self.run('select id from fielddefs where name = "longdesc"')
        ids = self.cursor.fetchall()
        if len(ids) != 1:
            raise util.Abort(_('unknown database schema'))
        return ids[0][0]

class bugzilla(object):
    # supported versions of bugzilla. different versions have
    # different schemas.
    _versions = {
        '2.16': bugzilla_2_16,
        '2.18': bugzilla_2_18,
        '3.0':  bugzilla_3_0
        }

    _default_bug_re = (r'bugs?\s*,?\s*(?:#|nos?\.?|num(?:ber)?s?)?\s*'
                       r'((?:\d+\s*(?:,?\s*(?:and)?)?\s*)+)')

    _bz = None

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

    def bz(self):
        '''return object that knows how to talk to bugzilla version in
        use.'''

        if bugzilla._bz is None:
            bzversion = self.ui.config('bugzilla', 'version')
            try:
                bzclass = bugzilla._versions[bzversion]
            except KeyError:
                raise util.Abort(_('bugzilla version %s not supported') %
                                 bzversion)
            bugzilla._bz = bzclass(self.ui)
        return bugzilla._bz

    def __getattr__(self, key):
        return getattr(self.bz(), key)

    _bug_re = None
    _split_re = None

    def find_bug_ids(self, ctx):
        '''find valid bug ids that are referred to in changeset
        comments and that do not already have references to this
        changeset.'''

        if bugzilla._bug_re is None:
            bugzilla._bug_re = re.compile(
                self.ui.config('bugzilla', 'regexp', bugzilla._default_bug_re),
                re.IGNORECASE)
            bugzilla._split_re = re.compile(r'\D+')
        start = 0
        ids = {}
        while True:
            m = bugzilla._bug_re.search(ctx.description(), start)
            if not m:
                break
            start = m.end()
            for id in bugzilla._split_re.split(m.group(1)):
                if not id: continue
                ids[int(id)] = 1
        ids = ids.keys()
        if ids:
            ids = self.filter_real_bug_ids(ids)
        if ids:
            ids = self.filter_unknown_bug_ids(ctx.node(), ids)
        return ids

    def update(self, bugid, ctx):
        '''update bugzilla bug with reference to changeset.'''

        def webroot(root):
            '''strip leading prefix of repo root and turn into
            url-safe path.'''
            count = int(self.ui.config('bugzilla', 'strip', 0))
            root = util.pconvert(root)
            while count > 0:
                c = root.find('/')
                if c == -1:
                    break
                root = root[c+1:]
                count -= 1
            return root

        mapfile = self.ui.config('bugzilla', 'style')
        tmpl = self.ui.config('bugzilla', 'template')
        t = cmdutil.changeset_templater(self.ui, self.repo,
                                        False, None, mapfile, False)
        if not mapfile and not tmpl:
            tmpl = _('changeset {node|short} in repo {root} refers '
                     'to bug {bug}.\ndetails:\n\t{desc|tabindent}')
        if tmpl:
            tmpl = templater.parsestring(tmpl, quoted=False)
            t.use_template(tmpl)
        self.ui.pushbuffer()
        t.show(ctx, changes=ctx.changeset(),
               bug=str(bugid),
               hgweb=self.ui.config('web', 'baseurl'),
               root=self.repo.root,
               webroot=webroot(self.repo.root))
        data = self.ui.popbuffer()
        self.add_comment(bugid, data, util.email(ctx.user()))

def hook(ui, repo, hooktype, node=None, **kwargs):
    '''add comment to bugzilla for each changeset that refers to a
    bugzilla bug id. only add a comment once per bug, so same change
    seen multiple times does not fill bug with duplicate data.'''
    try:
        import MySQLdb as mysql
        global MySQLdb
        MySQLdb = mysql
    except ImportError, err:
        raise util.Abort(_('python mysql support not available: %s') % err)

    if node is None:
        raise util.Abort(_('hook type %s does not pass a changeset id') %
                         hooktype)
    try:
        bz = bugzilla(ui, repo)
        ctx = repo[node]
        ids = bz.find_bug_ids(ctx)
        if ids:
            for id in ids:
                bz.update(id, ctx)
            bz.notify(ids, util.email(ctx.user()))
    except MySQLdb.MySQLError, err:
        raise util.Abort(_('database error: %s') % err[1])