node-cron | Cron for NodeJS. - | Cron Utils library
kandi X-RAY | node-cron Summary
kandi X-RAY | node-cron Summary
Cron for NodeJS.
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Top functions reviewed by kandi - BETA
- Initialize a new CronTime instance .
- Create a new crjob instance .
- Creates a new instance of cron .
- Calls the callback function with the current time .
- CCT instance .
- Wrap a child process with the supplied command .
- Set timeout .
node-cron Key Features
node-cron Examples and Code Snippets
Community Discussions
Trending Discussions on node-cron
QUESTION
i have a controller
...ANSWER
Answered 2022-Apr-16 at 10:07You got the concept wrongly. Having a scheduled job means running something periodically which has to be a function that does something. You don't need a router defined in it. Your code does only one thing - schedules a router to be available for the user once the scheduled time happens and redefines it every 10 minutes.
What you need is to create a separate function for the operation and call it on a scheduled time and having a router at this point is extra unless you want to run it when the user sends a request as well.
QUESTION
I want to get response for a specific url using node-cron.
As in the example code below, 'scheduler' requests to specific url every 10 seconds.
However, I want this action to be performed only 10 times.
(There may be other ways, but I definitely want to use the 'start' and 'stop' methods of node-crone.)
I really want to use the while statement.. The code I wrote doesn't wait for the response of the 'start' method, and as a result, an infinite loop is executed.
I'll leave the code I wrote below, so if you have a solution, please reply. thanks!!
...ANSWER
Answered 2022-Mar-21 at 16:03A couple things:
Scheduling
*/10 * * * * *,
results in an exception. You'll simply need to remove that last comma.Take a look at the node-cron code here in GitHub. More on this below.
When calling start()
in a loop, you are essentially scheduling work to be done, then clearing that work to be scheduled in the next call, as the first line in start()
clears any previous timers.
So, let's let node-cron
do the scheduling 😃:
QUESTION
I try to rebuild an electron app but I got this error regarding the epoll installation.
...ANSWER
Answered 2021-Nov-09 at 06:01I have a same problem too, but i am using a serialport not epoll.
So, I think the cause of this problem is electron modules not the native module.
QUESTION
I am writing a node application that uses node-cron to schedule certain function to run at specific times. Currently the code for this is embedded in the main application. I want to move the configuration of scheduled tasks out to a config file, so want need to store the function names in a variable to achieve this, as the schedule tasks call out a number of functions in different modules etc.
For information the syntax to schedule a cron task is this:
...ANSWER
Answered 2022-Mar-17 at 15:58The reason your code isn't working is that mycronobj[item]schedulefunction
is a string so is not invokable. You need to turn this string into a reference to the function with the same name.
The simplest solution to this is using eval
, e.g:
QUESTION
Actualy I try to intgrat but I face to this exception my node version is 16.3.2 32bit
...ANSWER
Answered 2022-Mar-17 at 08:03SOLVED BY @chilkat Software by upgrading the current version of chilkat/ck-electron16-win64 and win32
QUESTION
I'm working with node and typescript, using node-cron 2.0 to schedule a background operation to run every hour.
...ANSWER
Answered 2022-Feb-21 at 13:55You can use a Semaphore
to prevent parallel calls.
You will need to know when purgeResponsesSurveys
is done. So if it's asynchronous you will need to return Promise
or receive a callback
that will be called when purgeResponsesSurveys
is done.
I used semaphore npm package. Here is a small example/simulation.
QUESTION
I'm writing a Discord bot and having it schedule a cron job when it starts up using node-cron. I've defined it as follows (very basic so far):
...ANSWER
Answered 2022-Feb-14 at 14:01First, you need somewhere to save the name of the scheduled task, which defaults to a UUID V4 but can be provided as an option using the 3rd argument of the schedule method you are calling above.
With a reference to this name, either from a database or a constant that is hard-coded in the script you have wrote, you can use cron.getTasks
to list all of the scheduled tasks to ensure that the current task doesn't already exist before scheduling it.
If you are referencing a hard-coded name, then calling the schedule
method will replace the existing scheduled task, rather than creating a new task.
UPDATE
To set the name of the scheduled task, simply pass in an options object as a third argument to the schedule
method you are calling, with a name for your task.
Example:
QUESTION
I'm trying to create a timed scheduler that can execute tasks in parallel. For example:
Let's say I'm trying to create a function that will do something after 10 seconds of being called. After calling Process_1()
, it will be expected to run its intended functionality after 10 seconds.
But at the 5 second mark while Process_1()
is waiting to be executed at the halfway point, I'm now calling Process_2()
midway. So at the 10 seconds mark, Process_1()
will execute its function and at the 15 seconds mark, Process_2()
will execute its function.
I've tried using node-cron for this but it doesn't seem like it can schedule things in parallel. Thanks in advance!
...ANSWER
Answered 2022-Jan-28 at 00:53Nodejs runs your Javascript in a single thread unless you explicitly create a WorkerThread and run some code in that. True parallel execution where both jobs are running code that uses the CPU will only be accomplished if you either run each task in a WorkerThread or child process to get it out of the main thread.
Let me repeat, true parallel execution requires more than one thread or process in nodejs and nodejs does not do that by default so you will have to create a WorkerThread or child_process.
So, if you have code that takes more than a few ms to do its work and you want it to run at a fairly precise time, then you can't count on the main Javascript thread to do that because it might be busy at that precise time. Timers in Javascript will run your code no earlier than the scheduled time, and when that scheduled time comes around, the event loop is ready to run them, but they won't actually run until whatever was running before finishes and returns control back to the event loop so the event loop can run the code attached to your timer.
So, if all you're mostly doing is I/O kind of work (reading/writing files or network), then your actual Javascript execution time is probably only milliseconds and nodejs can be very, very responsive to run your timers pretty close to "on time". But, if you have computationally expensive things that keep the CPU busy for much longer, then you can't count on your timers to run "on time" if you run that CPU-heavy stuff in the main thread.
What you can do, is start up a WorkerThread, set the timer in the WorkerThread and run your code in the worker thread. As long as you don't ask that WorkerThread to run anything else, it should be ready to run that timer pretty much "on time".
Now WorkerThreads do share some resources with the main thread so they aren't 100% independent (though they are close to independent). If you want 100% independence, then you can start a nodejs child process that runs a node script, sets its own timers and runs its own work in that other process.
All that said, the single threaded model works very, very well at reasonably high scale for code that is predominantly I/O code because nodejs uses non-blocking I/O so while it's waiting to read or write from file or network, the main thread is free and available to run other things. So, it will often give the appearance of running things in parallel because progress is being made on multiple fronts. The I/O itself inside the nodejs library is either natively non-blocking (network I/O) or is happening in an OS-native thread (file I/O) and the programming interface to Javascript is callback or promise based so it is also non-blocking.
I mention all this because you don't say what your two operations that you want to run in parallel are (including your actual code allows us to write more complete answers). If they are I/O or even some crypto, then they may already be non-blocking and you may achieve desired parallelism without having to use additional threads or processes.
QUESTION
I have following package.json
...ANSWER
Answered 2021-Dec-28 at 13:15To resolve this issue update the "passport" lib version in your package.json: from "passport": "^0.5.2", to "passport": "^0.4.0", so it's same as used in @nestjs/passport@8.0.1.
QUESTION
I have an app with postgres as db, sequelize, and express, and whenever it receives a db query, it just stays there forever, no logging or anything I run postgres in a container which I can connect to through GUI normally When I swapped it for sqlite, it worked perfectly the application
here is the relevant piece of code
...ANSWER
Answered 2021-Dec-12 at 05:49I think it is your "0.0.0.0:5432".
If local, it should be just "localhost:5432". If deployed server is remote, it should be a certain IP address XXX.XXX.XXX.XXX:5432. If deployed server is home network, it should be "192.168.0.XXX:5432".
Check your postgres network configuration https://youtu.be/Erqp4C3Y3Ds
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