Viewing file:  ext.py (5.95 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
# 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(0, _utc) + datetime.timedelta(
seconds=self.to_unix()
)
@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())
|