forked from platypush/platypush
194 lines
5 KiB
Python
194 lines
5 KiB
Python
from abc import ABC, abstractmethod
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import datetime
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import logging
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import inspect
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import json
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import time
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from typing import Union
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logger = logging.getLogger('platypush')
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class JSONAble(ABC):
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"""
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Generic interface for JSON-able objects.
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"""
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@abstractmethod
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def to_json(self) -> Union[str, list, dict]:
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raise NotImplementedError()
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class Message(object):
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""" Message generic class """
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class Encoder(json.JSONEncoder):
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@staticmethod
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def parse_numpy(obj):
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try:
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import numpy as np
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except ImportError:
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return
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if isinstance(obj, np.floating):
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return float(obj)
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if isinstance(obj, np.integer):
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return int(obj)
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if isinstance(obj, np.ndarray):
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return obj.tolist()
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if callable(obj):
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return '<function at {}.{}>'.format(obj.__module__, obj.__name__)
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return
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@staticmethod
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def parse_datetime(obj):
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if isinstance(obj, datetime.datetime) or \
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isinstance(obj, datetime.date) or \
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isinstance(obj, datetime.time):
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return obj.isoformat()
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def default(self, obj):
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value = self.parse_datetime(obj)
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if value is not None:
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return value
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if isinstance(obj, set):
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return list(obj)
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value = self.parse_numpy(obj)
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if value is not None:
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return value
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if isinstance(obj, JSONAble):
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return obj.to_json()
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try:
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return super().default(obj)
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except Exception as e:
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logger.warning('Could not serialize object type {}: {}: {}'.format(
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type(obj), str(e), obj))
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def __init__(self, timestamp=None, *args, **kwargs):
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self.timestamp = timestamp or time.time()
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def __str__(self):
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"""
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Overrides the str() operator and converts
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the message into a UTF-8 JSON string
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"""
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return json.dumps({
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attr: getattr(self, attr)
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for attr in self.__dir__()
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if (attr != '_timestamp' or not attr.startswith('_'))
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and not inspect.ismethod(getattr(self, attr))
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}, cls=self.Encoder).replace('\n', ' ')
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def __bytes__(self):
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"""
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Overrides the bytes() operator, converts the message into
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its JSON-serialized UTF-8-encoded representation
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"""
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return str(self).encode('utf-8')
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@classmethod
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def parse(cls, msg):
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"""
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Parse a generic message into a key-value dictionary
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Params:
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msg -- Original message - can be a dictionary, a Message,
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or a string/bytearray, as long as it's valid UTF-8 JSON
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"""
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if isinstance(msg, cls):
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msg = str(msg)
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if isinstance(msg, bytes) or isinstance(msg, bytearray):
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msg = msg.decode('utf-8')
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if isinstance(msg, str):
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try:
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msg = json.loads(msg.strip())
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except (ValueError, TypeError):
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logger.warning('Invalid JSON message: {}'.format(msg))
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assert isinstance(msg, dict)
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if '_timestamp' not in msg:
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msg['_timestamp'] = time.time()
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return msg
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@classmethod
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def build(cls, msg):
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"""
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Builds a Message object from a dictionary.
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Params:
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msg -- The message as a key-value dictionary, Message object or JSON string
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"""
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from platypush.utils import get_message_class_by_type
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msg = cls.parse(msg)
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msgtype = get_message_class_by_type(msg['type'])
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if msgtype != cls:
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return msgtype.build(msg)
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class Mapping(dict):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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for k, v in kwargs.items():
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self.__setattr__(k, v)
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def __setitem__(self, key, item):
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self.__dict__[key] = item
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def __getitem__(self, key):
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return self.__dict__[key]
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def __repr__(self):
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return repr(self.__dict__)
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def __len__(self):
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return len(self.__dict__)
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def __delitem__(self, key):
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del self.__dict__[key]
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def clear(self):
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return self.__dict__.clear()
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def copy(self):
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return self.__dict__.copy()
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def has_key(self, k):
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return k in self.__dict__
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def update(self, *args, **kwargs):
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return self.__dict__.update(*args, **kwargs)
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def keys(self):
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return self.__dict__.keys()
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def values(self):
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return self.__dict__.values()
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def items(self):
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return self.__dict__.items()
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def pop(self, *args):
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return self.__dict__.pop(*args)
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def __cmp__(self, dict_):
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return self.__cmp__(dict_)
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def __contains__(self, item):
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return item in self.__dict__
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def __iter__(self):
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return iter(self.__dict__)
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def __str__(self):
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return str(self.__dict__)
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# vim:sw=4:ts=4:et:
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