mirror of
https://github.com/jbowdre/phpIPAM-for-vRA8.git
synced 2024-11-30 02:42:18 +00:00
268 lines
9.8 KiB
Python
268 lines
9.8 KiB
Python
from __future__ import absolute_import
|
|
|
|
import time
|
|
|
|
# The default socket timeout, used by httplib to indicate that no timeout was
|
|
# specified by the user
|
|
from socket import _GLOBAL_DEFAULT_TIMEOUT
|
|
|
|
from ..exceptions import TimeoutStateError
|
|
|
|
# A sentinel value to indicate that no timeout was specified by the user in
|
|
# urllib3
|
|
_Default = object()
|
|
|
|
|
|
# Use time.monotonic if available.
|
|
current_time = getattr(time, "monotonic", time.time)
|
|
|
|
|
|
class Timeout(object):
|
|
"""Timeout configuration.
|
|
|
|
Timeouts can be defined as a default for a pool:
|
|
|
|
.. code-block:: python
|
|
|
|
timeout = Timeout(connect=2.0, read=7.0)
|
|
http = PoolManager(timeout=timeout)
|
|
response = http.request('GET', 'http://example.com/')
|
|
|
|
Or per-request (which overrides the default for the pool):
|
|
|
|
.. code-block:: python
|
|
|
|
response = http.request('GET', 'http://example.com/', timeout=Timeout(10))
|
|
|
|
Timeouts can be disabled by setting all the parameters to ``None``:
|
|
|
|
.. code-block:: python
|
|
|
|
no_timeout = Timeout(connect=None, read=None)
|
|
response = http.request('GET', 'http://example.com/, timeout=no_timeout)
|
|
|
|
|
|
:param total:
|
|
This combines the connect and read timeouts into one; the read timeout
|
|
will be set to the time leftover from the connect attempt. In the
|
|
event that both a connect timeout and a total are specified, or a read
|
|
timeout and a total are specified, the shorter timeout will be applied.
|
|
|
|
Defaults to None.
|
|
|
|
:type total: int, float, or None
|
|
|
|
:param connect:
|
|
The maximum amount of time (in seconds) to wait for a connection
|
|
attempt to a server to succeed. Omitting the parameter will default the
|
|
connect timeout to the system default, probably `the global default
|
|
timeout in socket.py
|
|
<http://hg.python.org/cpython/file/603b4d593758/Lib/socket.py#l535>`_.
|
|
None will set an infinite timeout for connection attempts.
|
|
|
|
:type connect: int, float, or None
|
|
|
|
:param read:
|
|
The maximum amount of time (in seconds) to wait between consecutive
|
|
read operations for a response from the server. Omitting the parameter
|
|
will default the read timeout to the system default, probably `the
|
|
global default timeout in socket.py
|
|
<http://hg.python.org/cpython/file/603b4d593758/Lib/socket.py#l535>`_.
|
|
None will set an infinite timeout.
|
|
|
|
:type read: int, float, or None
|
|
|
|
.. note::
|
|
|
|
Many factors can affect the total amount of time for urllib3 to return
|
|
an HTTP response.
|
|
|
|
For example, Python's DNS resolver does not obey the timeout specified
|
|
on the socket. Other factors that can affect total request time include
|
|
high CPU load, high swap, the program running at a low priority level,
|
|
or other behaviors.
|
|
|
|
In addition, the read and total timeouts only measure the time between
|
|
read operations on the socket connecting the client and the server,
|
|
not the total amount of time for the request to return a complete
|
|
response. For most requests, the timeout is raised because the server
|
|
has not sent the first byte in the specified time. This is not always
|
|
the case; if a server streams one byte every fifteen seconds, a timeout
|
|
of 20 seconds will not trigger, even though the request will take
|
|
several minutes to complete.
|
|
|
|
If your goal is to cut off any request after a set amount of wall clock
|
|
time, consider having a second "watcher" thread to cut off a slow
|
|
request.
|
|
"""
|
|
|
|
#: A sentinel object representing the default timeout value
|
|
DEFAULT_TIMEOUT = _GLOBAL_DEFAULT_TIMEOUT
|
|
|
|
def __init__(self, total=None, connect=_Default, read=_Default):
|
|
self._connect = self._validate_timeout(connect, "connect")
|
|
self._read = self._validate_timeout(read, "read")
|
|
self.total = self._validate_timeout(total, "total")
|
|
self._start_connect = None
|
|
|
|
def __repr__(self):
|
|
return "%s(connect=%r, read=%r, total=%r)" % (
|
|
type(self).__name__,
|
|
self._connect,
|
|
self._read,
|
|
self.total,
|
|
)
|
|
|
|
# __str__ provided for backwards compatibility
|
|
__str__ = __repr__
|
|
|
|
@classmethod
|
|
def _validate_timeout(cls, value, name):
|
|
"""Check that a timeout attribute is valid.
|
|
|
|
:param value: The timeout value to validate
|
|
:param name: The name of the timeout attribute to validate. This is
|
|
used to specify in error messages.
|
|
:return: The validated and casted version of the given value.
|
|
:raises ValueError: If it is a numeric value less than or equal to
|
|
zero, or the type is not an integer, float, or None.
|
|
"""
|
|
if value is _Default:
|
|
return cls.DEFAULT_TIMEOUT
|
|
|
|
if value is None or value is cls.DEFAULT_TIMEOUT:
|
|
return value
|
|
|
|
if isinstance(value, bool):
|
|
raise ValueError(
|
|
"Timeout cannot be a boolean value. It must "
|
|
"be an int, float or None."
|
|
)
|
|
try:
|
|
float(value)
|
|
except (TypeError, ValueError):
|
|
raise ValueError(
|
|
"Timeout value %s was %s, but it must be an "
|
|
"int, float or None." % (name, value)
|
|
)
|
|
|
|
try:
|
|
if value <= 0:
|
|
raise ValueError(
|
|
"Attempted to set %s timeout to %s, but the "
|
|
"timeout cannot be set to a value less "
|
|
"than or equal to 0." % (name, value)
|
|
)
|
|
except TypeError:
|
|
# Python 3
|
|
raise ValueError(
|
|
"Timeout value %s was %s, but it must be an "
|
|
"int, float or None." % (name, value)
|
|
)
|
|
|
|
return value
|
|
|
|
@classmethod
|
|
def from_float(cls, timeout):
|
|
"""Create a new Timeout from a legacy timeout value.
|
|
|
|
The timeout value used by httplib.py sets the same timeout on the
|
|
connect(), and recv() socket requests. This creates a :class:`Timeout`
|
|
object that sets the individual timeouts to the ``timeout`` value
|
|
passed to this function.
|
|
|
|
:param timeout: The legacy timeout value.
|
|
:type timeout: integer, float, sentinel default object, or None
|
|
:return: Timeout object
|
|
:rtype: :class:`Timeout`
|
|
"""
|
|
return Timeout(read=timeout, connect=timeout)
|
|
|
|
def clone(self):
|
|
"""Create a copy of the timeout object
|
|
|
|
Timeout properties are stored per-pool but each request needs a fresh
|
|
Timeout object to ensure each one has its own start/stop configured.
|
|
|
|
:return: a copy of the timeout object
|
|
:rtype: :class:`Timeout`
|
|
"""
|
|
# We can't use copy.deepcopy because that will also create a new object
|
|
# for _GLOBAL_DEFAULT_TIMEOUT, which socket.py uses as a sentinel to
|
|
# detect the user default.
|
|
return Timeout(connect=self._connect, read=self._read, total=self.total)
|
|
|
|
def start_connect(self):
|
|
"""Start the timeout clock, used during a connect() attempt
|
|
|
|
:raises urllib3.exceptions.TimeoutStateError: if you attempt
|
|
to start a timer that has been started already.
|
|
"""
|
|
if self._start_connect is not None:
|
|
raise TimeoutStateError("Timeout timer has already been started.")
|
|
self._start_connect = current_time()
|
|
return self._start_connect
|
|
|
|
def get_connect_duration(self):
|
|
"""Gets the time elapsed since the call to :meth:`start_connect`.
|
|
|
|
:return: Elapsed time in seconds.
|
|
:rtype: float
|
|
:raises urllib3.exceptions.TimeoutStateError: if you attempt
|
|
to get duration for a timer that hasn't been started.
|
|
"""
|
|
if self._start_connect is None:
|
|
raise TimeoutStateError(
|
|
"Can't get connect duration for timer that has not started."
|
|
)
|
|
return current_time() - self._start_connect
|
|
|
|
@property
|
|
def connect_timeout(self):
|
|
"""Get the value to use when setting a connection timeout.
|
|
|
|
This will be a positive float or integer, the value None
|
|
(never timeout), or the default system timeout.
|
|
|
|
:return: Connect timeout.
|
|
:rtype: int, float, :attr:`Timeout.DEFAULT_TIMEOUT` or None
|
|
"""
|
|
if self.total is None:
|
|
return self._connect
|
|
|
|
if self._connect is None or self._connect is self.DEFAULT_TIMEOUT:
|
|
return self.total
|
|
|
|
return min(self._connect, self.total)
|
|
|
|
@property
|
|
def read_timeout(self):
|
|
"""Get the value for the read timeout.
|
|
|
|
This assumes some time has elapsed in the connection timeout and
|
|
computes the read timeout appropriately.
|
|
|
|
If self.total is set, the read timeout is dependent on the amount of
|
|
time taken by the connect timeout. If the connection time has not been
|
|
established, a :exc:`~urllib3.exceptions.TimeoutStateError` will be
|
|
raised.
|
|
|
|
:return: Value to use for the read timeout.
|
|
:rtype: int, float, :attr:`Timeout.DEFAULT_TIMEOUT` or None
|
|
:raises urllib3.exceptions.TimeoutStateError: If :meth:`start_connect`
|
|
has not yet been called on this object.
|
|
"""
|
|
if (
|
|
self.total is not None
|
|
and self.total is not self.DEFAULT_TIMEOUT
|
|
and self._read is not None
|
|
and self._read is not self.DEFAULT_TIMEOUT
|
|
):
|
|
# In case the connect timeout has not yet been established.
|
|
if self._start_connect is None:
|
|
return self._read
|
|
return max(0, min(self.total - self.get_connect_duration(), self._read))
|
|
elif self.total is not None and self.total is not self.DEFAULT_TIMEOUT:
|
|
return max(0, self.total - self.get_connect_duration())
|
|
else:
|
|
return self._read
|