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authorDan McGee <dan@archlinux.org>2010-08-28 10:53:27 -0500
committerDan McGee <dan@archlinux.org>2010-08-28 10:53:27 -0500
commit2750b943457b63325a1292274070ac24b1fe5f99 (patch)
tree508b8079bf027d259934a3a286d71fe5fe12a582 /packages/utils.py
parent4c3100ab907b9edafad7913c03278caaa22ed4d1 (diff)
Move package utility functions
We now have a few of them, so move them to their own file like we do in the other applications. Signed-off-by: Dan McGee <dan@archlinux.org>
Diffstat (limited to 'packages/utils.py')
-rw-r--r--packages/utils.py103
1 files changed, 103 insertions, 0 deletions
diff --git a/packages/utils.py b/packages/utils.py
new file mode 100644
index 00000000..204e5bf2
--- /dev/null
+++ b/packages/utils.py
@@ -0,0 +1,103 @@
+from django.db import connection
+from django.db.models import Count, Max
+
+from operator import itemgetter
+
+from main.models import Package
+from main.utils import cache_function
+from .models import PackageGroup
+
+@cache_function(300)
+def get_group_info():
+ raw_groups = PackageGroup.objects.values_list(
+ 'name', 'pkg__arch__name').order_by('name').annotate(
+ cnt=Count('pkg'), last_update=Max('pkg__last_update'))
+ # now for post_processing. we need to seperate things out and add
+ # the count in for 'any' to all of the other architectures.
+ group_mapping = {}
+ for grp in raw_groups:
+ arch_groups = group_mapping.setdefault(grp[1], {})
+ arch_groups[grp[0]] = {'name': grp[0], 'arch': grp[1],
+ 'count': grp[2], 'last_update': grp[3]}
+
+ # we want to promote the count of 'any' packages in groups to the
+ # other architectures, and also add any 'any'-only groups
+ if 'any' in group_mapping:
+ any_groups = group_mapping['any']
+ del group_mapping['any']
+ for arch, arch_groups in group_mapping.iteritems():
+ for grp in any_groups.itervalues():
+ if grp['name'] in arch_groups:
+ found = arch_groups[grp['name']]
+ found['count'] += grp['count']
+ if grp['last_update'] > found['last_update']:
+ found['last_update'] = grp['last_update']
+ else:
+ new_g = grp.copy()
+ # override the arch to not be 'any'
+ new_g['arch'] = arch
+ arch_groups[grp['name']] = new_g
+
+ # now transform it back into a sorted list
+ groups = []
+ for val in group_mapping.itervalues():
+ groups.extend(val.itervalues())
+ return sorted(groups, key=itemgetter('name', 'arch'))
+
+@cache_function(300)
+def get_differences_info(arch_a, arch_b):
+ # This is a monster. Join packages against itself, looking for packages in
+ # our non-'any' architectures only, and not having a corresponding package
+ # entry in the other table (or having one with a different pkgver). We will
+ # then go and fetch all of these packages from the database and display
+ # them later using normal ORM models.
+ sql = """
+SELECT p.id, q.id
+ FROM packages p
+ LEFT JOIN packages q
+ ON (
+ p.pkgname = q.pkgname
+ AND p.repo_id = q.repo_id
+ AND p.arch_id != q.arch_id
+ AND p.id != q.id
+ )
+ WHERE p.arch_id IN (%s, %s)
+ AND (
+ q.id IS NULL
+ OR
+ p.pkgver != q.pkgver
+ OR
+ p.pkgrel != q.pkgrel
+ )
+"""
+ cursor = connection.cursor()
+ cursor.execute(sql, [arch_a.id, arch_b.id])
+ results = cursor.fetchall()
+ to_fetch = []
+ for row in results:
+ # column A will always have a value, column B might be NULL
+ to_fetch.append(row[0])
+ # fetch all of the necessary packages
+ pkgs = Package.objects.in_bulk(to_fetch)
+ # now build a list of tuples containing differences
+ differences = []
+ for row in results:
+ pkg_a = pkgs.get(row[0])
+ pkg_b = pkgs.get(row[1])
+ # We want arch_a to always appear first
+ # pkg_a should never be None
+ if pkg_a.arch == arch_a:
+ item = (pkg_a.pkgname, pkg_a.repo, pkg_a, pkg_b)
+ else:
+ # pkg_b can be None in this case, so be careful
+ name = pkg_a.pkgname if pkg_a else pkg_b.pkgname
+ repo = pkg_a.repo if pkg_a else pkg_b.repo
+ item = (name, repo, pkg_b, pkg_a)
+ if item not in differences:
+ differences.append(item)
+
+ # now sort our list by repository, package name
+ differences.sort(key=lambda a: (a[1].name, a[0]))
+ return differences
+
+# vim: set ts=4 sw=4 et: