Add some bulk lookup methods to ML2 for RPC handling
This adds three methods to make working with bulk port DB lookups easier in ML2: * partial_port_ids_to_full_ids: takes short port IDs map to full port IDs. This will allow us to eliminate many LIKE queries and do one just once for all ports on an RPC call. * get_port_db_objects: Takes a list of port IDs and returns a map to port DB objects. This allows us to get access to sqla obejcts for a bunch of ports without a custom session.query call. * get_network_contexts: Takes a list of network_ids and does a bulk construction of NetworkContext objects and returns them as a map of network_id to NetworkContext to avoid expensive net lookups when constructing lots of PortContext objects. Partial-Bug: #1665215 Change-Id: I330eefbf429bd62f2a7e8ebadf7037da15c86815
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@ -292,6 +292,46 @@ def get_distributed_port_bindings(context, port_id):
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return bindings
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@db_api.context_manager.reader
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def partial_port_ids_to_full_ids(context, partial_ids):
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"""Takes a list of the start of port IDs and returns full IDs.
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Returns dictionary of partial IDs to full IDs if a single match
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is found.
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"""
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result = {}
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to_full_query = (context.session.query(models_v2.Port.id).
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filter(or_(*[models_v2.Port.id.startswith(p)
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for p in partial_ids])))
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candidates = [match[0] for match in to_full_query]
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for partial_id in partial_ids:
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matching = [c for c in candidates if c.startswith(partial_id)]
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if len(matching) == 1:
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result[partial_id] = matching[0]
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continue
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if len(matching) < 1:
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LOG.info("No ports have port_id starting with %s", partial_id)
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elif len(matching) > 1:
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LOG.error(_LE("Multiple ports have port_id starting with %s"),
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partial_id)
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return result
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@db_api.context_manager.reader
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def get_port_db_objects(context, port_ids):
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"""Takes a list of port_ids and returns matching port db objects.
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return format is a dictionary keyed by passed in IDs with db objects
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for values or None if the port was not present.
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"""
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port_qry = (context.session.query(models_v2.Port).
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filter(models_v2.Port.id.in_(port_ids)))
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result = {p: None for p in port_ids}
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for port in port_qry:
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result[port.id] = port
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return result
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@db_api.context_manager.reader
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def is_dhcp_active_on_any_subnet(context, subnet_ids):
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if not subnet_ids:
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@ -884,6 +884,23 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
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return [db_utils.resource_fields(net, fields) for net in nets]
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def get_network_contexts(self, context, network_ids):
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"""Return a map of network_id to NetworkContext for network_ids."""
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net_filters = {'id': list(set(network_ids))}
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nets_by_netid = {
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n['id']: n for n in self.get_networks(context,
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filters=net_filters)
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}
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segments_by_netid = segments_db.get_networks_segments(
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context, nets_by_netid.keys())
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netctxs_by_netid = {
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net_id: driver_context.NetworkContext(
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self, context, nets_by_netid[net_id],
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segments=segments_by_netid[net_id])
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for net_id in nets_by_netid.keys()
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}
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return netctxs_by_netid
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@utils.transaction_guard
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def delete_network(self, context, id):
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# the only purpose of this override is to protect this from being
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