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import logging
import os
import gevent
from volttron.platform import get_address
from volttron.platform.agent import utils
from volttron.platform.keystore import KeyStore, KnownHostsStore
from volttron.platform.vip.agent import Agent
from volttron.platform.vip.agent.connection import Connection
utils.setup_logging()
_log = logging.getLogger(__name__)
host_store = KnownHostsStore()
[docs]def get_known_host_serverkey(vip_address):
return host_store.serverkey(vip_address)
[docs]def get_server_keys():
try:
# attempt to read server's keys. Should be used only by multiplatform connection and tests
# If agents such as forwarder attempt this in secure mode this will throw access violation exception
ks = KeyStore()
except IOError as e:
raise RuntimeError("Exception accessing server keystore. Agents must use agent's public and private key"
"to build dynamic agents when running in secure mode. Exception:{}".format(e))
return ks.public, ks.secret
[docs]def build_connection(identity, peer='', address=get_address(),
publickey=None, secretkey=None, message_bus=None, **kwargs):
if publickey is None or secretkey is None:
publickey, secretkey = get_server_keys(publickey, secretkey)
cn = Connection(address=address, identity=identity, peer=peer,
publickey=publickey, secretkey=secretkey, message_bus=message_bus, **kwargs)
return cn
[docs]def build_agent(address=get_address(), identity=None, publickey=None,
secretkey=None, timeout=10, serverkey=None,
agent_class=Agent, volttron_central_address=None,
volttron_central_instance_name=None, **kwargs) -> Agent:
""" Builds a dynamic agent connected to the specifiedd address.
All key parameters should have been encoded with
:py:meth:`volttron.platform.vip.socket.encode_key`
:param str address: VIP address to connect to
:param str identity: Agent's identity
:param str publickey: Agent's Base64-encoded CURVE public key
:param str secretkey: Agent's Base64-encoded CURVE secret key
:param str serverkey: Server's Base64-encoded CURVE public key
:param class agent_class: Class to use for creating the instance
:param int timeout: Seconds to wait for agent to start
:param kwargs: Any Agent specific parameters
:return: an agent based upon agent_class that has been started
:rtype: agent_class
"""
# if not serverkey:
# serverkey = get_known_host_serverkey(address)
# This is a fix allows the connect to message bus to be different than
# the one that is currently running.
if publickey is None or secretkey is None:
publickey, secretkey = get_server_keys()
try:
message_bus = kwargs.pop('message_bus')
except KeyError:
message_bus = os.environ.get('MESSAGEBUS', 'zmq')
try:
enable_store = kwargs.pop('enable_store')
except KeyError:
enable_store = False
agent = agent_class(address=address, identity=identity, publickey=publickey,
secretkey=secretkey, serverkey=serverkey, volttron_central_address=volttron_central_address,
volttron_central_instance_name=volttron_central_instance_name,
message_bus=message_bus, enable_store=enable_store, **kwargs)
event = gevent.event.Event()
gevent.spawn(agent.core.run, event)
with gevent.Timeout(timeout):
event.wait()
return agent