Python Serial Timeout Example
Hermelindo Sauceda
I ran across this thread when searching for a timeout call on unit tests. I didn't find anything simple in the answers or 3rd party packages so I wrote the decorator below you can drop right into code:
For the timeout itself - You need to define what timeout means - because on Windows it will take considerable (and not determinable) time to spawn the process. This can be tricky on short timeouts. Lets assume, spawning the process takes about 0.5 seconds (easily !!!). If You give a timeout of 0.2 seconds what should happen?Should the function time out after 0.5 + 0.2 seconds (so let the method run for 0.2 seconds)?Or should the called process time out after 0.2 seconds (in that case, the decorated function will ALWAYS timeout, because in that time it is not even spawned)?
If you want to cancel the background task and not just timeout on the running main code, then you need an explicit communication from main thread to ask the code of the task to cancel , like a threading.Event()
I have face the same problem but my situation is need work on sub thread, signal didn't work for me, so I wrote a python package: timeout-timer to solve this problem, support for use as context or decorator, use signal or sub thread module to trigger a timeout interrupt:
The asyncio components that enable structured concurrency, likeasyncio.TaskGroup and asyncio.timeout(),are implemented using cancellation internally and might misbehave ifa coroutine swallows asyncio.CancelledError. Similarly, user codeshould not generally call uncancel.However, in cases when suppressing asyncio.CancelledError istruly desired, it is necessary to also call uncancel() to completelyremove the cancellation state.
The async with statement will wait for all tasks in the group to finish.While waiting, new tasks may still be added to the group(for example, by passing tg into one of the coroutinesand calling tg.create_task() in that coroutine).Once the last task has finished and the async with block is exited,no new tasks may be added to the group.
While the block with make_request() and make_another_request()might get cancelled due to the timeout, unrelated_code() shouldcontinue running even in case of the timeout. This is implementedwith uncancel(). TaskGroup context managers useuncancel() in a similar fashion.
All this is done and simple. The script initializes a class that when run creates a screenshot of each site in the list. Some sites take a very, very long time to load, and some might not be loaded at all. So I want to wrap the screengrabber-function in a timeout script, making the function return False if it couldn't finish within 10 seconds.
Passing the optional timeout parameter will set the timeout on thesocket instance before attempting to connect. If no timeout issupplied, the global default timeout setting returned bygetdefaulttimeout() is used.
The family, type and proto arguments can be optionally specifiedin order to narrow the list of addresses returned. Passing zero as avalue for each of these arguments selects the full range of results.The flags argument can be one or several of the AI_* constants,and will influence how results are computed and returned.For example, AI_NUMERICHOST will disable domain name resolutionand will raise an error if host is a domain name.
Convert a packed IP address (a bytes-like object of some number ofbytes) to its standard, family-specific string representation (forexample, '7.10.0.5' or '5aef:2b::8').inet_ntop() is useful when a library or network protocol returns anobject of type in_addr (similar to inet_ntoa()) orin6_addr.
Set a timeout on blocking socket operations. The value argument can be anonnegative floating point number expressing seconds, or None.If a non-zero value is given, subsequent socket operations will raise atimeout exception if the timeout period value has elapsed beforethe operation has completed. If zero is given, the socket is put innon-blocking mode. If None is given, the socket is put in blocking mode.
At the operating system level, sockets in timeout mode are internally setin non-blocking mode. Also, the blocking and timeout modes are shared betweenfile descriptors and socket objects that refer to the same network endpoint.This implementation detail can have visible consequences if e.g. you decideto use the fileno() of a socket.
The connect() operation is also subject to the timeoutsetting, and in general it is recommended to call settimeout()before calling connect() or pass a timeout parameter tocreate_connection(). However, the system network stack may alsoreturn a connection timeout error of its own regardless of any Python sockettimeout setting.
Here are four minimal example programs using the TCP/IP protocol: a server thatechoes all data that it receives back (servicing only one client), and a clientusing it. Note that a server must perform the sequence socket(),bind(), listen(), accept() (possiblyrepeating the accept() to service more than one client), while aclient only needs the sequence socket(), connect(). Alsonote that the server does not sendall()/recv() onthe socket it is listening on but on the new socket returned byaccept().
The next two examples are identical to the above two, but support both IPv4 andIPv6. The server side will listen to the first address family available (itshould listen to both instead). On most of IPv6-ready systems, IPv6 will takeprecedence and the server may not accept IPv4 traffic. The client side will tryto connect to all the addresses returned as a result of the name resolution, andsends traffic to the first one connected successfully.
This is the function wherein you pass the timeout, the function you want to call, and any arguments, and it runs it for up to #timeout# seconds, and will return/raise anything the passed function would otherwise return or raise.
Maybe also rescheduling relative to the start of the loop would be nice.
Think of awaiting asyncio.as_completed() in a for-loop which will be rescheduled as soon as the first future has resolved, for example.
I have tried setting this timeout and while it is accepted by OpenAI without error it does not seem to have an effect. The timeout still occurs at 600s when most of my requests take between 2 and 5 sec.
Extending this to OpenAI models, when their model is congested, it might not even return an error message (as we have been seeing today), and so it remains the responsibility of the client-side to manage the timeout, which is subtask of overall error and exceptions handling.
Server Side Timeout , customizes the timeout sent to the server. Does not usually have to be set, as the client sets it based on the timeout on the operation. Uses the timeout option, and defaults to the Analytics timeout set on the client (75s). This can be adjusted at the cluster global config level.
If you need to mix client-level and request-level options in a way that is not supported by the default Merging of parameters, you can use .build_request() and then make arbitrary modifications to the Request instance. For example:
For some advanced configuration you might need to instantiate a transportclass directly, and pass it to the client instance. One example is thelocal_address configuration which is only available via this low-level API.
Unfortunately, when a host is offline, the ping takes a long time to timeout. I checked man ping, there seem to be two options to set the timeout delay: -w deadline and -W timeout. I think I'm interested in the latter.
@laszlo-valko -does-ping-not-timeout-in-linux explains that ping timeouts only start after the ip address has been determined. If you use a dns and your workstation is offline then ping cannot determine the ip address and so appears to wait approximately a default 20+secs before returning false.
This is used to set the time the WebDriver must wait for an asynchronous script to finish execution before throwing an error. If the timeout is negative, then the script will be allowed to run indefinitely.
The default timeout for setScriptTimeout method is zero. If you do not set time, then there are chances that executeAsyncScript method may fail because the JavaScript code may take more than the time allotted. To avoid such failures, set the setScriptTimeout. This is mainly used for Javascript objects and executors.
For the sake of understanding, the ID for the username given in the above example is incorrect. The driver cannot find the element between 10 seconds, and it throws a timeout exception as demonstrated below.
In Selenium, you can handle a connection timeout by setting a timeout value for the WebDriver using the set_page_load_timeout() method. This method sets the maximum time (in seconds) that the driver should wait for a page to load before throwing a TimeoutException. For example to set timeout as 10 seconds, you can use set_page_load_timeout(10)
The timeout in Selenium is set in seconds or milliseconds, depending on the method used. For example, the set_page_load_timeout() method in the WebDriver takes the timeout value in seconds, while the pause command in Selenium IDE takes the timeout value in milliseconds.
You can change the default timeout in Selenium by using the set_page_load_timeout method of the WebDriver object. For example: driver.set_page_load_timeout(10)
You can also set a timeout for implicitly waiting for an element to be present on the page, using the implicitly_wait method.
In Selenium, a TimeoutException is an exception raised when an operation runs out after a specified period. For example, when using the WebDriver.get method to load a page, the default timeout is set to 30 seconds. If the page takes longer than 30 seconds to load, a TimeoutException will be raised. Similarly, when using the WebDriver.find_element method to locate an element on a page, a TimeoutException will be raised if the element is not found within a specified timeout.
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