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#! /usr/bin/env python
import os, sys
import urllib2

from datetime import datetime
from lxml.html import fromstring
from optparse import OptionParser

path = os.path.join(os.path.dirname(__file__), os.path.pardir)
sys.path.insert(0, path)
del path

from grumpy import app
from grumpy.models import db, Developer, PkgIssue, Setting

DEVS_URL = 'http://www.gentoo.org/proj/en/devrel/roll-call/userinfo.xml'
PLUGIN_NAME='qa::valid_developer'

def gc_collect(timestamp):
    """Remove old QA issues from database returning number of rows deleted."""
    db.session.expire_all()
    print ("DEBUG: Deleted %d old issues." % PkgIssue.query \
                        .filter_by(plugin=PLUGIN_NAME) \
                        .filter(PkgIssue.created_on < timestamp).delete(False))

def insert_issues(invalid):
    """Insert QA issues into db."""
    if 'maintainer-needed@gentoo.org' in invalid:
        h = Developer.query.filter_by(email='maintainer-needed@gentoo.org').first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'maintainer-needed'))
        invalid.remove('maintainer-needed@gentoo.org')
    for dev in invalid:
        d = Developer.query.filter_by(email=dev).first()
        for pkg in d.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'unknown-dev', \
                      'User %s is not as active Gentoo developer.' % dev))
    db.session.commit()

def download_and_parse_devs():
    """Return list of herd names from 'userinfo.xml'"""
    data = urllib2.urlopen(DEVS_URL).read()
    devs = []
    # Select <table class='ntable'> from page and iterate over rows
    for tr in fromstring(data).cssselect('.ntable')[0].getchildren():
        # Next we have tr > td > b
        devs.append('%s@gentoo.org' % tr.getchildren()[0].getchildren()[0].text)
    # Skip first (this is table header
    del devs[0]
    return devs

if __name__ == '__main__':
    parser = OptionParser(usage="usage: %prog [options] CONFFILE")
    (opts, args) = parser.parse_args()
    if len(args) != 1:
        parser.error("provide path to configuration file as first argument")
        sys.exit(1)
    # Fetch data and parse it
    devs = download_and_parse_devs()
    b0rks = []
    timestamp = datetime.now()
    with app.test_request_context():
        # Load configuration
        app.config.from_pyfile(args[0])
        # Fetch list of developers from db
        dbdevs = [d.email for d in Developer.query.filter( \
                    Developer.email.like('%@gentoo.org')).all()]
        for dev in dbdevs:
            if dev in devs:
                devs.remove(dev)
            else:
                b0rks.append(dev)
        insert_issues(b0rks)
        # Clean up issues < timestamp
        gc_collect(timestamp)
        # Update settings and add info about last run..
        Setting.query.filter_by(name=PLUGIN_NAME).delete(False)
        db.session.add(Setting(PLUGIN_NAME, str(timestamp)))
        db.session.commit()