Get information from openvswitch ovsdb

ovs-db.py

#!/usr/bin/env python

import ovs.db.idl
import ovs.poller

ovs.vlog.Vlog.set_levels_from_string("console:dbg")
ovs.vlog.Vlog.init()

remote = 'unix:/var/run/openvswitch/db.sock'
# If not present, will read from default path
#schema_file = '/usr/share/openvswitch/vswitch.ovsschema'
schema_helper = ovs.db.idl.SchemaHelper(schema_file)

# Either only get selected information:
#schema_helper.register_columns("Bridge", ["name", "ports"])
#schema_helper.register_columns("Port", ["name", "mac"])
# Or all of it:
schema_helper.register_all()

idl = ovs.db.idl.Idl(remote, schema_helper)

p = ovs.poller.Poller()
while True:
  # You must call wait(poller) before you call p.block(), otherwise you
  # will block forever or not get any information back
  idl.run()
  idl.wait(p)
  p.block()