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# coding: utf-8 from collections import namedtuple import datetime import sys import struct PY2 = sys.version_info[0] == 2 if PY2: int_types = (int, long) _utc = None else: int_types = int try: _utc = datetime.timezone.utc except AttributeError: _utc = datetime.timezone(datetime.timedelta(0)) class ExtType(namedtuple("ExtType", "code data")): """ExtType represents ext type in msgpack.""" def __new__(cls, code, data): if not isinstance(code, int): raise TypeError("code must be int") if not isinstance(data, bytes): raise TypeError("data must be bytes") if not 0 <= code <= 127: raise ValueError("code must be 0~127") return super(ExtType, cls).__new__(cls, code, data) class Timestamp(object): """Timestamp represents the Timestamp extension type in msgpack. When built with Cython, msgpack uses C methods to pack and unpack `Timestamp`. When using pure-Python msgpack, :func:`to_bytes` and :func:`from_bytes` are used to pack and unpack `Timestamp`. This class is immutable: Do not override seconds and nanoseconds. """ __slots__ = ["seconds", "nanoseconds"] def __init__(self, seconds, nanoseconds=0): """Initialize a Timestamp object. :param int seconds: Number of seconds since the UNIX epoch (00:00:00 UTC Jan 1 1970, minus leap seconds). May be negative. :param int nanoseconds: Number of nanoseconds to add to `seconds` to get fractional time. Maximum is 999_999_999. Default is 0. Note: Negative times (before the UNIX epoch) are represented as negative seconds + positive ns. """ if not isinstance(seconds, int_types): raise TypeError("seconds must be an interger") if not isinstance(nanoseconds, int_types): raise TypeError("nanoseconds must be an integer") if not (0 <= nanoseconds < 10 ** 9): raise ValueError( "nanoseconds must be a non-negative integer less than 999999999." ) self.seconds = seconds self.nanoseconds = nanoseconds def __repr__(self): """String representation of Timestamp.""" return "Timestamp(seconds={0}, nanoseconds={1})".format( self.seconds, self.nanoseconds ) def __eq__(self, other): """Check for equality with another Timestamp object""" if type(other) is self.__class__: return ( self.seconds == other.seconds and self.nanoseconds == other.nanoseconds ) return False def __ne__(self, other): """not-equals method (see :func:`__eq__()`)""" return not self.__eq__(other) def __hash__(self): return hash((self.seconds, self.nanoseconds)) @staticmethod def from_bytes(b): """Unpack bytes into a `Timestamp` object. Used for pure-Python msgpack unpacking. :param b: Payload from msgpack ext message with code -1 :type b: bytes :returns: Timestamp object unpacked from msgpack ext payload :rtype: Timestamp """ if len(b) == 4: seconds = struct.unpack("!L", b)[0] nanoseconds = 0 elif len(b) == 8: data64 = struct.unpack("!Q", b)[0] seconds = data64 & 0x00000003FFFFFFFF nanoseconds = data64 >> 34 elif len(b) == 12: nanoseconds, seconds = struct.unpack("!Iq", b) else: raise ValueError( "Timestamp type can only be created from 32, 64, or 96-bit byte objects" ) return Timestamp(seconds, nanoseconds) def to_bytes(self): """Pack this Timestamp object into bytes. Used for pure-Python msgpack packing. :returns data: Payload for EXT message with code -1 (timestamp type) :rtype: bytes """ if (self.seconds >> 34) == 0: # seconds is non-negative and fits in 34 bits data64 = self.nanoseconds << 34 | self.seconds if data64 & 0xFFFFFFFF00000000 == 0: # nanoseconds is zero and seconds < 2**32, so timestamp 32 data = struct.pack("!L", data64) else: # timestamp 64 data = struct.pack("!Q", data64) else: # timestamp 96 data = struct.pack("!Iq", self.nanoseconds, self.seconds) return data @staticmethod def from_unix(unix_sec): """Create a Timestamp from posix timestamp in seconds. :param unix_float: Posix timestamp in seconds. :type unix_float: int or float. """ seconds = int(unix_sec // 1) nanoseconds = int((unix_sec % 1) * 10 ** 9) return Timestamp(seconds, nanoseconds) def to_unix(self): """Get the timestamp as a floating-point value. :returns: posix timestamp :rtype: float """ return self.seconds + self.nanoseconds / 1e9 @staticmethod def from_unix_nano(unix_ns): """Create a Timestamp from posix timestamp in nanoseconds. :param int unix_ns: Posix timestamp in nanoseconds. :rtype: Timestamp """ return Timestamp(*divmod(unix_ns, 10 ** 9)) def to_unix_nano(self): """Get the timestamp as a unixtime in nanoseconds. :returns: posix timestamp in nanoseconds :rtype: int """ return self.seconds * 10 ** 9 + self.nanoseconds def to_datetime(self): """Get the timestamp as a UTC datetime. Python 2 is not supported. :rtype: datetime. """ return datetime.datetime.fromtimestamp(self.to_unix(), _utc) @staticmethod def from_datetime(dt): """Create a Timestamp from datetime with tzinfo. Python 2 is not supported. :rtype: Timestamp """ return Timestamp.from_unix(dt.timestamp())