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

from datetime import datetime
from lxml.etree 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, Herd, PkgIssue, Setting

HERDS_URL = 'http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo/xml/htdocs/proj/en/metastructure/herds/herds.xml'
PLUGIN_NAME='qa::valid_herd'

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' in invalid:
        h = Herd.query.filter_by(name='maintainer-needed').first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'maintainer-needed'))
        invalid.remove('maintainer-needed')
    if 'no-herd' in invalid:
        h = Herd.query.filter_by(name='no-herd').first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'maintainer-needed'))
        invalid.remove('no-herd')
    if 'fix-me' in invalid:
        h = Herd.query.filter_by(name='fix-me').first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'invalid-herd', \
                           'Please use no-herd instead of empty tag'))
        invalid.remove('fix-me')
    for herd in invalid:
        h = Herd.query.filter_by(name=herd).first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'unknown-herd', \
                      'Herd %s is not listed in official herd list.' % herd))
    db.session.commit()

def download_and_parse_herds():
    """Return list of herd names from 'herds.xml'"""
    data = urllib2.urlopen(HERDS_URL)
    herds = []
    for child in fromstring(data.read()).getchildren():
        for value in child.getchildren():
            if value.tag == 'name':
                herds.append(value.text)
    return herds

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
    herds = download_and_parse_herds()
    b0rks = []
    timestamp = datetime.now()
    with app.test_request_context():
        # Load configuration
        app.config.from_pyfile(args[0])
        # Fetch list of herds from db
        for herd in Herd.query.all():
            if herd.name in herds:
                herds.remove(herd.name)
            else:
                b0rks.append(herd.name)
        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()