77 lines
2.1 KiB
Python
77 lines
2.1 KiB
Python
import logging
|
|
import inspect
|
|
import json
|
|
import time
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class Message(object):
|
|
""" Message generic class """
|
|
|
|
def __init__(self, timestamp=None, *args, **kwargs):
|
|
self.timestamp = timestamp or time.time()
|
|
|
|
def __str__(self):
|
|
"""
|
|
Overrides the str() operator and converts
|
|
the message into a UTF-8 JSON string
|
|
"""
|
|
|
|
return json.dumps({
|
|
attr: getattr(self, attr)
|
|
for attr in self.__dir__()
|
|
if (attr != '_timestamp' or not attr.startswith('_'))
|
|
and not inspect.ismethod(getattr(self, attr))
|
|
}).replace('\n', ' ')
|
|
|
|
def __bytes__(self):
|
|
"""
|
|
Overrides the bytes() operator, converts the message into
|
|
its JSON-serialized UTF-8-encoded representation
|
|
"""
|
|
return str(self).encode('utf-8')
|
|
|
|
@classmethod
|
|
def parse(cls, msg):
|
|
"""
|
|
Parse a generic message into a key-value dictionary
|
|
Params:
|
|
msg -- Original message - can be a dictionary, a Message,
|
|
or a string/bytearray, as long as it's valid UTF-8 JSON
|
|
"""
|
|
|
|
if isinstance(msg, cls):
|
|
msg = str(msg)
|
|
if isinstance(msg, bytes) or isinstance(msg, bytearray):
|
|
msg = msg.decode('utf-8')
|
|
if isinstance(msg, str):
|
|
try:
|
|
msg = json.loads(msg.strip())
|
|
except:
|
|
logger.warning('Invalid JSON message: {}'.format(msg))
|
|
|
|
assert isinstance(msg, dict)
|
|
|
|
if not '_timestamp' in msg:
|
|
msg['_timestamp'] = time.time()
|
|
|
|
return msg
|
|
|
|
@classmethod
|
|
def build(cls, msg):
|
|
"""
|
|
Builds a Message object from a dictionary.
|
|
Params:
|
|
msg -- The message as a key-value dictionary, Message object or JSON string
|
|
"""
|
|
from platypush.utils import get_message_class_by_type
|
|
|
|
|
|
msg = cls.parse(msg)
|
|
msgtype = get_message_class_by_type(msg['type'])
|
|
if msgtype != cls: return msgtype.build(msg)
|
|
|
|
# vim:sw=4:ts=4:et:
|
|
|