Introduce intent for TFW messages and fix FSM related bugs

tfw/components/fsm/fsm_handler.py

@@ -1,7 +1,7 @@
 import logging
 
 from tfw.internals.crypto import KeyManager, sign_message
-from tfw.internals.networking import Scope
+from tfw.internals.networking import Scope, Intent
 
 from .fsm_updater import FSMUpdater
 
@@ -12,6 +12,7 @@ class FSMHandler:
     keys = ['fsm']
 
     def __init__(self, *, fsm_type, initial_trigger):
+        self.connector = None
         self.fsm = fsm_type()
         self._fsm_updater = FSMUpdater(self.fsm)
         self.auth_key = KeyManager().auth_key
@@ -20,7 +21,7 @@ class FSMHandler:
         self.command_handlers = {
             'frontend.ready' : self.handle_ready,
             'fsm.step'       : self.handle_step,
-            'fsm.announce' : self.handle_announce
+            'fsm.update'     : self.handle_update
         }
 
     def start(self):
@@ -32,7 +33,7 @@ class FSMHandler:
             if message:
                 fsm_update_message = self._fsm_updater.fsm_update
                 sign_message(self.auth_key, fsm_update_message)
-                connector.send_message(fsm_update_message, Scope.BROADCAST)
+                connector.send_message(fsm_update_message, Scope.BROADCAST, Intent.EVENT)
         except KeyError:
             LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
 
@@ -41,10 +42,10 @@ class FSMHandler:
         self.connector.unsubscribe('frontend.ready')
         return message
 
-    def handle_step(self, message):
+    def handle_step(self, message): # pylint: disable=inconsistent-return-statements
         if self.fsm.step(message['trigger']):
             return message
 
-    def handle_announce(self, message):
+    def handle_update(self, message):
         # pylint: disable=no-self-use
         return message

tfw/components/fsm/fsm_updater.py

@@ -15,8 +15,9 @@ class FSMUpdater:
             {'trigger': trigger}
             for trigger in self.fsm.get_triggers(self.fsm.state)
         ]
+        if not self.fsm.event_log:
+            return {}
         last_fsm_event = self.fsm.event_log[-1]
-        last_fsm_event['timestamp'] = last_fsm_event['timestamp'].isoformat()
         return {
             'current_state': self.fsm.state,
             'valid_transitions': valid_transitions,

tfw/components/process_management/log_inotify_observer.py

@@ -1,6 +1,4 @@
-import logging
+from tfw.internals.networking import Scope, Intent
-
-from tfw.internals.networking import Scope
 from tfw.internals.inotify import InotifyObserver
 
 from .supervisor import ProcessLogManager
@@ -33,4 +31,4 @@ class LogInotifyObserver(InotifyObserver, ProcessLogManager):
             'key': 'process.log.new',
             'stdout': self.read_stdout(self.process_name, tail=self.log_tail),
             'stderr': self.read_stderr(self.process_name, tail=self.log_tail)
-        }, Scope.BROADCAST)
+        }, Scope.BROADCAST, Intent.EVENT)

tfw/components/process_management/process_handler.py

@@ -1,7 +1,7 @@
 import logging
 from xmlrpc.client import Fault as SupervisorFault
 
-from tfw.internals.networking import Scope
+from tfw.internals.networking import Scope, Intent
 
 from .supervisor import ProcessManager
 
@@ -26,7 +26,7 @@ class ProcessHandler(ProcessManager):
                 self.commands[message['key']](message['name'])
             except SupervisorFault as fault:
                 message['error'] = fault.faultString
-            connector.send_message(message, scope=Scope.WEBSOCKET)
+            connector.send_message(message, scope=Scope.BROADCAST, intent=Intent.EVENT)
         except KeyError:
             if not message['key'].startswith('process.log'):
                 LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)

tfw/event_handlers.py

@@ -1,2 +1,2 @@
 # pylint: disable=unused-import
-from tfw.internals.event_handling import EventHandler, FSMAwareEventHandler, SignedEventHandler
+from tfw.internals.event_handling import EventHandler, ControlEventHandler, FSMAwareEventHandler, SignedEventHandler

tfw/fsm/fsm_base.py

@@ -76,7 +76,7 @@ class FSMBase(Machine, CallbackMixin):
             'from_state': from_state,
             'to_state': self.state,
             'trigger': trigger,
-            'timestamp': datetime.utcnow()
+            'timestamp': datetime.utcnow().isoformat()
         })
 
     @property

tfw/internals/crypto/authentication.py

@@ -12,6 +12,7 @@ from tfw.internals.networking import message_bytes
 
 def sign_message(key, message):
     message.pop('scope', None)
+    message.pop('intent', None)
     message.pop('signature', None)
     signature = message_signature(key, message)
     message['signature'] = b64encode(signature).decode()
@@ -23,6 +24,7 @@ def message_signature(key, message):
 
 def verify_message(key, message):
     message.pop('scope', None)
+    message.pop('intent', None)
     message = deepcopy(message)
     try:
         signature_b64 = message.pop('signature')

tfw/internals/event_handling/__init__.py

@@ -1,4 +1,5 @@
 from .event_handler import EventHandler
 from .event_handler_factory_base import EventHandlerFactoryBase
+from .control_event_handler import ControlEventHandler
 from .fsm_aware_event_handler import FSMAwareEventHandler
 from .signed_event_handler import SignedEventHandler

tfw/internals/event_handling/control_event_handler.py

@@ -0,0 +1,9 @@
+from tfw.internals.networking import Intent
+
+from .event_handler import EventHandler
+
+
+class ControlEventHandler(EventHandler): # pylint: disable=abstract-method
+    def _event_callback(self, message):
+        if message.get('intent') != Intent.EVENT.value:
+            self.handle_event(message, self.connector)

tfw/internals/event_handling/fsm_aware.py

@@ -7,6 +7,7 @@ LOG = logging.getLogger(__name__)
 
 class FSMAware:
     keys = ['fsm.update']
+
     def __init__(self):
         self.fsm_state = None
         self.fsm_in_accepted_state = False

tfw/internals/event_handling/signed_event_handler.py

@@ -2,13 +2,13 @@ import logging
 
 from tfw.internals.crypto import KeyManager, verify_message
 
-from .event_handler import EventHandler
+from .control_event_handler import ControlEventHandler
 
 LOG = logging.getLogger(__name__)
 
 
 # pylint: disable=abstract-method
-class SignedEventHandler(EventHandler):
+class SignedEventHandler(ControlEventHandler):
     def __init__(self, connector):
         self._auth_key = KeyManager().auth_key
         super().__init__(connector)

tfw/internals/networking/__init__.py

@@ -2,3 +2,4 @@ from .serialization import serialize_tfw_msg, deserialize_tfw_msg, with_deserial
 from .zmq_connector import ZMQConnector, ZMQDownlinkConnector, ZMQUplinkConnector
 from .zmq_listener import ZMQListener
 from .scope import Scope
+from .intent import Intent

tfw/internals/networking/intent.py

@@ -0,0 +1,6 @@
+from enum import Enum
+
+
+class Intent(Enum):
+    CONTROL = 'control'
+    EVENT = 'event'

tfw/internals/networking/zmq_connector.py

@@ -4,6 +4,7 @@ import zmq
 from zmq.eventloop.zmqstream import ZMQStream
 
 from .scope import Scope
+from .intent import Intent
 from .serialization import (
     serialize_tfw_msg,
     deserialize_tfw_msg,
@@ -51,8 +52,10 @@ class ZMQUplinkConnector:
         self._zmq_push_socket.setsockopt(zmq.SNDHWM, 0)
         self._zmq_push_socket.connect(connect_addr)
 
-    def send_message(self, message, scope=Scope.ZMQ):
+    def send_message(self, message, scope=Scope.ZMQ, intent=None):
         message['scope'] = scope.value
+        if isinstance(intent, Intent):
+            message['intent'] = intent.value
         self._zmq_push_socket.send_multipart(serialize_tfw_msg(message))
 
     def close(self):