![]() The loop will run the current batch of callbacks and then exit. If stop() is called while run_forever() is running, ![]() Those that were already scheduled), and then exit. Run all callbacks scheduled in response to I/O events (and The loop will poll the I/O selector once with a timeout of zero, If stop() is called before run_forever() is called, Run the event loop until stop() is called. Return the Future’s result or raise its exception. Is implicitly scheduled to run as a asyncio.Task. Run until the future (an instance of Future) has The Examples section showcases how to work with some eventĮvent loops have low-level APIs for the following:Įxecuting code in thread or process pools SelectorEventLoop and ProactorEventLoop classes The Event Loop Implementations section documents the The Server Objects section documents types returned fromĮvent loop methods like loop.create_server() ![]() Methods such as loop.call_soon() and loop.call_later() TimerHandle instances which are returned from scheduling The Callback Handles section documents the Handle and The Event Loop Methods section is the reference documentation of This documentation page contains the following sections: Note that the behaviour of get_event_loop(), set_event_loop(),Īnd new_event_loop() functions can be altered by new_event_loop ( ) ¶Ĭreate and return a new event loop object. Set loop as the current event loop for the current OS thread. In some future Python release this will become an error. In Python versions 3.10.9, 3.11.1 and 3.12 they emit aĭeprecationWarning if there is no running event loop and no (and other functions which use it implicitly) emitted aĭeprecationWarning if there was no running event loop, even if Retries under the new version are also now limited per-address where in the older versions each retry meant a full DNS result set of addresses was re-tried.Īs a result dns_timout is separated from connect_timeout which is now fully controlling only one individual TCP connection handshake.In Python versions 3.10.0–3.10.8 and 3.11.0 this function TCP connection attempts are still run in serial, but where older versions of Squid interspersed a DNS lookup with each set of TCP attempts the new 3.2 code identifies all the possible destinations first and tries each individual address until a working connection is found. As a result the maximum DNS lookup time is reduced from the sum of A and AAAA response times, to the maximum of both. Although Firefox implementation of the “Happy Eyeballs” algorithm appears to have been instrumental in uncovering a certain major bug in Squids new connection handling recently.įor those interested, Squid-3.2 does implement by default a variation of the “Happy Eyeballs” algorithm.ĭNS lookups are performed in parallel now, as opposed to serial as they were in 3.1. Squid operating as forward proxy do not face this issue as each browser only opens a limited number of connections to the proxy. Whether or not you are operating an existing interception proxy or installing a new one this is one major new feature of the modern web which needs to be taken into account when provisioning the network and Squid socket/FD resources. Geoff Huston wrote up a very interesting analysis of the RFC 6555 “Happy Eyeballs” features being added to web browsers recently.Īs these features reach the mainstream stable browser releases and more people being using them Squid in the role of intercepting proxy are starting to face the same issues mentioned for CGN gateways.
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