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bpo-38615: Add timeout parameter for IMAP4 and IMAP4_SSL constructor (GH-17203) 

imaplib.IMAP4 and imaplib.IMAP4_SSL now have an 
optional *timeout* parameter for their constructors.
Also, the imaplib.IMAP4.open() method now has an optional *timeout* parameter
with this change. The overridden methods of imaplib.IMAP4_SSL and
imaplib.IMAP4_stream were applied to this change.
This commit is contained in:
Dong-hee Na 2020-01-08 02:28:10 +09:00 committed by Victor Stinner
parent 950c6795aa
commit 13a7ee8d62
5 changed files with 90 additions and 25 deletions
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37
Doc/library/imaplib.rst
View File

@ -30,12 +30,14 @@ Three classes are provided by the :mod:`imaplib` module, :class:`IMAP4` is the
base class:
.. class:: IMAP4(host='', port=IMAP4_PORT)
.. class:: IMAP4(host='', port=IMAP4_PORT, timeout=None)
This class implements the actual IMAP4 protocol. The connection is created and
protocol version (IMAP4 or IMAP4rev1) is determined when the instance is
initialized. If *host* is not specified, ``''`` (the local host) is used. If
*port* is omitted, the standard IMAP4 port (143) is used.
*port* is omitted, the standard IMAP4 port (143) is used. The optional *timeout*
parameter specifies a timeout in seconds for the connection attempt.
If timeout is not given or is None, the global default socket timeout is used.
The :class:`IMAP4` class supports the :keyword:`with` statement. When used
like this, the IMAP4 ``LOGOUT`` command is issued automatically when the
@ -50,6 +52,9 @@ base class:
.. versionchanged:: 3.5
Support for the :keyword:`with` statement was added.
.. versionchanged:: 3.9
The optional *timeout* parameter was added.
Three exceptions are defined as attributes of the :class:`IMAP4` class:
@ -78,7 +83,7 @@ There's also a subclass for secure connections:
.. class:: IMAP4_SSL(host='', port=IMAP4_SSL_PORT, keyfile=None, \
certfile=None, ssl_context=None)
certfile=None, ssl_context=None, timeout=None)
This is a subclass derived from :class:`IMAP4` that connects over an SSL
encrypted socket (to use this class you need a socket module that was compiled
@ -95,8 +100,12 @@ There's also a subclass for secure connections:
mutually exclusive with *ssl_context*, a :class:`ValueError` is raised
if *keyfile*/*certfile* is provided along with *ssl_context*.
The optional *timeout* parameter specifies a timeout in seconds for the
connection attempt. If timeout is not given or is None, the global default
socket timeout is used.
.. versionchanged:: 3.3
*ssl_context* parameter added.
*ssl_context* parameter was added.
.. versionchanged:: 3.4
The class now supports hostname check with
@ -110,6 +119,8 @@ There's also a subclass for secure connections:
:func:`ssl.create_default_context` select the system's trusted CA
certificates for you.
.. versionchanged:: 3.9
The optional *timeout* parameter was added.
The second subclass allows for connections created by a child process:
@ -353,16 +364,22 @@ An :class:`IMAP4` instance has the following methods:
Send ``NOOP`` to server.
.. method:: IMAP4.open(host, port)
.. method:: IMAP4.open(host, port, timeout=None)
Opens socket to *port* at *host*. This method is implicitly called by
the :class:`IMAP4` constructor. The connection objects established by this
method will be used in the :meth:`IMAP4.read`, :meth:`IMAP4.readline`,
:meth:`IMAP4.send`, and :meth:`IMAP4.shutdown` methods. You may override
this method.
Opens socket to *port* at *host*. The optional *timeout* parameter
specifies a timeout in seconds for the connection attempt.
If timeout is not given or is None, the global default socket timeout
is used. Also note that if the *timeout* parameter is set to be zero,
it will raise a :class:`ValueError` to reject creating a non-blocking socket.
This method is implicitly called by the :class:`IMAP4` constructor.
The connection objects established by this method will be used in
the :meth:`IMAP4.read`, :meth:`IMAP4.readline`, :meth:`IMAP4.send`,
and :meth:`IMAP4.shutdown` methods. You may override this method.
.. audit-event:: imaplib.open self,host,port imaplib.IMAP4.open
.. versionchanged:: 3.9
The *timeout* parameter was added.
.. method:: IMAP4.partial(message_num, message_part, start, length)

10
Doc/whatsnew/3.9.rst
View File

@ -167,6 +167,16 @@ When the garbage collector makes a collection in which some objects resurrect
been executed), do not block the collection of all objects that are still
unreachable. (Contributed by Pablo Galindo and Tim Peters in :issue:`38379`.)
imaplib
-------
:class:`~imaplib.IMAP4` and :class:`~imaplib.IMAP4_SSL` now have
an optional *timeout* parameter for their constructors.
Also, the :meth:`~imaplib.IMAP4.open` method now has an optional *timeout* parameter
with this change. The overridden methods of :class:`~imaplib.IMAP4_SSL` and
:class:`~imaplib.IMAP4_stream` were applied to this change.
(Contributed by Dong-hee Na in :issue:`38615`.)
os
--

40
Lib/imaplib.py
View File

@ -135,10 +135,13 @@ class IMAP4:
r"""IMAP4 client class.
Instantiate with: IMAP4([host[, port]])
Instantiate with: IMAP4([host[, port[, timeout=None]]])
host - host's name (default: localhost);
port - port number (default: standard IMAP4 port).
timeout - socket timeout (default: None)
If timeout is not given or is None,
the global default socket timeout is used
All IMAP4rev1 commands are supported by methods of the same
name (in lower-case).
@ -181,7 +184,7 @@ class IMAP4:
class abort(error): pass # Service errors - close and retry
class readonly(abort): pass # Mailbox status changed to READ-ONLY
def __init__(self, host='', port=IMAP4_PORT):
def __init__(self, host='', port=IMAP4_PORT, timeout=None):
self.debug = Debug
self.state = 'LOGOUT'
self.literal = None # A literal argument to a command
@ -195,7 +198,7 @@ class IMAP4:
# Open socket to server.
self.open(host, port)
self.open(host, port, timeout)
try:
self._connect()
@ -284,15 +287,20 @@ class IMAP4:
# Overridable methods
def _create_socket(self):
def _create_socket(self, timeout):
# Default value of IMAP4.host is '', but socket.getaddrinfo()
# (which is used by socket.create_connection()) expects None
# as a default value for host.
if timeout is not None and not timeout:
raise ValueError('Non-blocking socket (timeout=0) is not supported')
host = None if not self.host else self.host
sys.audit("imaplib.open", self, self.host, self.port)
return socket.create_connection((host, self.port))
address = (host, self.port)
if timeout is not None:
return socket.create_connection(address, timeout)
return socket.create_connection(address)
def open(self, host = '', port = IMAP4_PORT):
def open(self, host='', port=IMAP4_PORT, timeout=None):
"""Setup connection to remote server on "host:port"
(default: localhost:standard IMAP4 port).
This connection will be used by the routines:
@ -300,7 +308,7 @@ class IMAP4:
"""
self.host = host
self.port = port
self.sock = self._create_socket()
self.sock = self._create_socket(timeout)
self.file = self.sock.makefile('rb')
@ -1261,7 +1269,7 @@ if HAVE_SSL:
"""IMAP4 client class over SSL connection
Instantiate with: IMAP4_SSL([host[, port[, keyfile[, certfile[, ssl_context]]]]])
Instantiate with: IMAP4_SSL([host[, port[, keyfile[, certfile[, ssl_context[, timeout=None]]]]]])
host - host's name (default: localhost);
port - port number (default: standard IMAP4 SSL port);
@ -1271,13 +1279,15 @@ if HAVE_SSL:
and private key (default: None)
Note: if ssl_context is provided, then parameters keyfile or
certfile should not be set otherwise ValueError is raised.
timeout - socket timeout (default: None) If timeout is not given or is None,
the global default socket timeout is used
for more documentation see the docstring of the parent class IMAP4.
"""
def __init__(self, host='', port=IMAP4_SSL_PORT, keyfile=None,
certfile=None, ssl_context=None):
certfile=None, ssl_context=None, timeout=None):
if ssl_context is not None and keyfile is not None:
raise ValueError("ssl_context and keyfile arguments are mutually "
"exclusive")
@ -1294,20 +1304,20 @@ if HAVE_SSL:
ssl_context = ssl._create_stdlib_context(certfile=certfile,
keyfile=keyfile)
self.ssl_context = ssl_context
IMAP4.__init__(self, host, port)
IMAP4.__init__(self, host, port, timeout)
def _create_socket(self):
sock = IMAP4._create_socket(self)
def _create_socket(self, timeout):
sock = IMAP4._create_socket(self, timeout)
return self.ssl_context.wrap_socket(sock,
server_hostname=self.host)
def open(self, host='', port=IMAP4_SSL_PORT):
def open(self, host='', port=IMAP4_SSL_PORT, timeout=None):
"""Setup connection to remote server on "host:port".
(default: localhost:standard IMAP4 SSL port).
This connection will be used by the routines:
read, readline, send, shutdown.
"""
IMAP4.open(self, host, port)
IMAP4.open(self, host, port, timeout)
__all__.append("IMAP4_SSL")
@ -1329,7 +1339,7 @@ class IMAP4_stream(IMAP4):
IMAP4.__init__(self)
def open(self, host = None, port = None):
def open(self, host=None, port=None, timeout=None):
"""Setup a stream connection.
This connection will be used by the routines:
read, readline, send, shutdown.

23
Lib/test/test_imaplib.py
View File

@ -440,6 +440,29 @@ class NewIMAPTestsMixin():
with self.imap_class(*server.server_address):
pass
def test_imaplib_timeout_test(self):
_, server = self._setup(SimpleIMAPHandler)
addr = server.server_address[1]
client = self.imap_class("localhost", addr, timeout=None)
self.assertEqual(client.sock.timeout, None)
client.shutdown()
client = self.imap_class("localhost", addr, timeout=support.LOOPBACK_TIMEOUT)
self.assertEqual(client.sock.timeout, support.LOOPBACK_TIMEOUT)
client.shutdown()
with self.assertRaises(ValueError):
client = self.imap_class("localhost", addr, timeout=0)
def test_imaplib_timeout_functionality_test(self):
class TimeoutHandler(SimpleIMAPHandler):
def handle(self):
time.sleep(1)
SimpleIMAPHandler.handle(self)
_, server = self._setup(TimeoutHandler)
addr = server.server_address[1]
with self.assertRaises(socket.timeout):
client = self.imap_class("localhost", addr, timeout=0.001)
def test_with_statement(self):
_, server = self._setup(SimpleIMAPHandler, connect=False)
with self.imap_class(*server.server_address) as imap:

5
Misc/NEWS.d/next/Library/2019-11-17-17-32-35.bpo-38615.OVyaNX.rst Normal file
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@ -0,0 +1,5 @@
:class:`~imaplib.IMAP4` and :class:`~imaplib.IMAP4_SSL` now have an
optional *timeout* parameter for their constructors.
Also, the :meth:`~imaplib.IMAP4.open` method now has an optional *timeout* parameter
with this change. The overridden methods of :class:`~imaplib.IMAP4_SSL` and
:class:`~imaplib.IMAP4_stream` were applied to this change. Patch by Dong-hee Na.