data.oci_model: init with app methods

data/oci_model/channel.py

@@ -0,0 +1,56 @@
+from data.oci_model import tag as tag_model
+from data.database import Tag, Channel
+
+
+def get_channel_releases(repo, channel):
+  """ Return all previously linked tags.
+      This works based upon Tag lifetimes.
+  """
+  tag_kind_id = Channel.tag_kind.get_id('channel')
+  channel_name = channel.name
+  return (Tag
+          .select(Tag, Channel)
+          .join(Channel, on=(Tag.id == Channel.linked_tag))
+          .where(Channel.repository == repo,
+                 Channel.name == channel_name,
+                 Channel.tag_kind == tag_kind_id, Channel.lifetime_end != None)
+          .order_by(Tag.lifetime_end))
+
+
+def get_channel(repo, channel_name):
+  """ Find a Channel by name. """
+  channel = tag_model.get_tag(repo, channel_name, "channel")
+  return channel
+
+
+def get_tag_channels(repo, tag_name, active=True):
+  """ Find the Channels associated with a Tag. """
+  tag = tag_model.get_tag(repo, tag_name, "release")
+  query = tag.tag_parents
+
+  if active:
+    query = tag_model.tag_alive_oci(query)
+
+  return query
+
+
+def delete_channel(repo, channel_name):
+  """ Delete a channel by name. """
+  return tag_model.delete_tag(repo, channel_name, "channel")
+
+
+def create_or_update_channel(repo, channel_name, tag_name):
+  """ Creates or updates a channel to include a particular tag. """
+  tag = tag_model.get_tag(repo, tag_name, 'release')
+  return tag.create_or_update_tag(repo, channel_name, linked_tag=tag, tag_kind="channel")
+
+
+def get_repo_channels(repo):
+  """ Creates or updates a channel to include a particular tag. """
+  tag_kind_id = Channel.tag_kind.get_id('channel')
+  query = (Channel
+           .select(Channel, Tag)
+           .join(Tag, on=(Tag.id == Channel.linked_tag))
+           .where(Channel.repository == repo,
+                  Channel.tag_kind == tag_kind_id))
+  return tag_model.tag_alive_oci(query, cls=Channel)