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"""Module with Kytos Events.""" |
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import json |
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from datetime import datetime |
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from uuid import uuid4 |
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from kytos.core.helpers import now |
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class KytosEvent: |
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"""Base Event class. |
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The event data will be passed in the `content` attribute, which should be a |
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dictionary. |
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""" |
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def __init__(self, name=None, content=None, trace_parent=None, priority=0): |
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"""Create an event to be published. |
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Args: |
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name (string): The name of the event. You should prepend it with |
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the name of the napp. |
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content (dict): Dictionary with any extra data for the event. |
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trace_parent (object): APM TraceParent for distributed tracing, |
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if you have APM enabled, @listen_to will |
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set the root parent, and then you have to |
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pass the trace_parent to subsequent |
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correlated KytosEvent(s). |
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priority (int): Priority of this event if a PriorityQueue is being |
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used, the lower the number the higher the priority. |
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""" |
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self.name = name |
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self.content = content if content is not None else {} |
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self.timestamp = now() |
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self.reinjections = 0 |
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self.priority = priority |
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# pylint: disable=invalid-name |
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self.id = uuid4() |
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self.trace_parent = trace_parent |
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def __str__(self): |
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return self.name |
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def __repr__(self): |
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return f"KytosEvent({self.name!r}, {self.content!r}, {self.priority})" |
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def __lt__(self, other): |
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"""Less than operator.""" |
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if self.priority != other.priority: |
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return self.priority < other.priority |
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return self.timestamp < other.timestamp |
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def as_dict(self): |
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"""Return KytosEvent as a dict.""" |
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return {'id': str(self.id), 'name': self.name, 'content': self.content, |
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'timestamp': self.timestamp, 'reinjections': self.reinjections} |
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def as_json(self): |
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"""Return KytosEvent as json.""" |
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as_dict = self.as_dict() |
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timestamp = datetime.strftime(as_dict['timestamp'], |
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'%Y-%m-%dT%H:%M:%S') |
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as_dict['timestamp'] = timestamp |
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try: |
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return json.dumps(as_dict) |
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except TypeError: |
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as_dict['content'] = str(as_dict['content']) |
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return json.dumps(as_dict) |
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@property |
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def destination(self): |
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"""Return the destination of KytosEvent.""" |
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return self.content.get('destination') |
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def set_destination(self, destination): |
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"""Update the destination of KytosEvent. |
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Args: |
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destination (string): destination of KytosEvent. |
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""" |
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self.content['destination'] = destination |
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@property |
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def source(self): |
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"""Return the source of KytosEvent.""" |
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return self.content.get('source') |
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def set_source(self, source): |
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"""Update the source of KytosEvent. |
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Args: |
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source (string): source of KytosEvent. |
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""" |
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self.content['source'] = source |
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@property |
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def message(self): |
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"""Return the message carried by the event if it exists. |
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If there is any OpenFlow message on the event it'll be stored on |
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the 'message' key of the 'content' attribute. |
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Returns: |
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A python-openflow message instance if it exists, None otherwise. |
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""" |
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try: |
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return self.content['message'] |
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except KeyError: |
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return None |
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kytos-ng /
kytos
