node-cache | A simple in-memory cache for nodejs | Runtime Evironment library
kandi X-RAY | node-cache Summary
kandi X-RAY | node-cache Summary
A simple in-memory cache for nodejs
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Top functions reviewed by kandi - BETA
- Creates a new cache object .
- Delete cache key
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node-cache Examples and Code Snippets
Community Discussions
Trending Discussions on node-cache
QUESTION
I have a api export with a lot of data so I tried to used the node-cache so the api will be faster since take more than 2 min to get the data, I am new on this so I found the follow code: Notes: env node js/express
...ANSWER
Answered 2022-Feb-10 at 23:33The solution was using a buffer but since we had to many data, the increase the memory from the db was the solution
QUESTION
Let's say I have Node/express app hosted on Heroku. I have implemented scalability using horizontal scaling by spanning a server across multiple dynos.
I have CMS panel to control content of the app which alters the DB to add content then content is presented to end-users throughout the server API.
What I want is to add cache mechanism to back-end API to make less trips to DB because I have huge traffic during the day by app users.
The solution initially can be done be setting up a simple cache using node-cache package which set in each server instance (dyno). But how to flush the cache through the CMS.
If I send a request to flush the cache, it will only trigger a single dyno each time. So the data isn't consistent across all dynos.
How to trigger flush cache on all dynos or is there a better way to handle caching?
...ANSWER
Answered 2021-Nov-07 at 12:23Instead of a per-dyno cache, you can use something outside of your dynos entirely. Heroku offers several add-ons for common products. I've never used node-cache
, but it is described like this:
A simple caching module that has
set
,get
anddelete
methods and works a little bit like memcached.
That suggests that Memcached might be a good choice. The Memcached Cloud addon has a free 30MB tier and the MemCachier addon has a free 25MB tier.
In either case, or if you choose to host your cache elsewhere, or even if you choose another tool entirely, you would then connect each of your dynos to the same cache. This has several benefits:
- Expiring items would then impact all dynos
- Once an item is cached via one dyno it is already in the cache for other dynos
- Cache content survives dyno restarts, which happen at least daily, so you'll have fewer misses
- Etc.
QUESTION
I deployed a brand new k8s cluster using kubespray, everything works fine but all of the calico related pods are not ready. And after many hours of debugging I couldn't find the reason why calico pods are crashing. I even disabled/stopped the entire firewalld service but nothing changed.
One other important thing is that calicoctl node status
output is not stable and every time gets called show something different:
ANSWER
Answered 2021-Sep-21 at 18:18Fortunately increasing timeoutSeconds
for both livenessProbe
& readinessProbe
from 1 to 60 fixes the issue.
QUESTION
I have an excel file that I want to only call in once and make available to all of my tests, at the moment it's being called on each test, I have tried storing it in the cache using https://www.npmjs.com/package/node-cache but when I tried to get it from cache it's saying undefined, so then I tried using onPrepare hook with no luck. Can someone point me in the right direction thanks in advance.
...ANSWER
Answered 2021-May-31 at 19:50Assuming that excel has data for test automation and it does not include any writing operations, I would suggest reading the content and store it in a constant. If you declare that variable globally, it will be available to all your tests. The complexity of this READ function depends on how diverse is your data. You can use libraries like https://www.npmjs.com/package/xlsx, https://www.npmjs.com/package/exceljs, etc..,
QUESTION
I have a typescript react app which I am trying to build for delpoy.
After running npm run build
and serve -s build
my app starts but it is only a blank page. The favicon is visible on tab.
I am using @reach/router
as my router, don't know if it has anything to do with the issue.
I've tried:
- adding
homepage: "."
to package.json - adding
homepage: "./"
to package.json - without
homepage
in package.json
Upon serving the app locally or deploying it to firebase I receive only the blank page. I can see the chunks being created and the files deployed.
The deployed version is hosted at: https://rezervavila-prod.web.app/
EDIT: I've seen on this answer that BrowserRouter
was an issue for some. In my case I'm using @reach/router
Router but I can't find a fix.
package.json
:
ANSWER
Answered 2021-May-29 at 16:28Your production environment variables is missing REACT_APP_API_URL
QUESTION
Background:
I have an old Seagate BlackArmor NAS 110 that I'm trying to install Debian on by following the instructions here: https://github.com/hn/seagate-blackarmor-nas.
I have a couple of USB to TTL serial adapters (one FTDI chipset and the other Prolific) that I've tried and have run into the same issue with both. I have made the connection to the serial port on the board of the NAS using a multimeter to make sure I've gotten the pinout correct.
Problem:
I'm not able to stop the autoboot process by pressing keys and any point during the boot process. The device also does not seem to respond to any keystrokes although they are echoed back.
What I've Tried So Far:
- Using USB to TTL serial adapters with two different chipsets
- Using the adapters on two different computers (MacBook Pro and a ThinkPad)
- Using different operating systems (MacOS, Windows 10, Ubuntu 20.04)
- Using different terminal programs (Screen, Minicom, Putty)
- Turned off hardware and software flow control
- Tested output of adapters by shorting RX and TX pins and seeing keystrokes echoed back
- Commands seem to be sent to device as when I type I see my commands echoed back (not sure if this is supposed to happen)
I've been at this for a few days and can't figure it out. I've also recorded my screen while experiencing the issue: https://streamable.com/xl43br. Can anyone see where I'm going wrong?
Terminal output while experiencing the problem:
...ANSWER
Answered 2021-Apr-22 at 15:51So it turns out there is a short somewhere between the RX pin and the +3.3V pin which is not allowing me to send anything to the board. Thank you to those who have commented.
QUESTION
I tried to use jcowgill's pre-compiled kernel and QCOW2 Disk Image, but qemu got stuck here after some output. Don't know what happened, qemu is just stuck here and I can't enter any commands.
Command:
...ANSWER
Answered 2021-Apr-01 at 19:04Your kernel command line says "console=tty0", which means "please send console to the first virtual terminal", ie to the graphics device. But there is no graphics device in the machine you're running (you say "-nographic" on your QEMU command line and the kernel says "Console: colour dummy device 80x25"). So what happens is that you see the initial bootup messages via the "uart8250" earlycon (ie the serial port), but as soon as the kernel gets to a point where it can honour your command line request, it enables tty0 (which goes nowhere) and disables uart8250 (so you see no further output).
You need to tell the kernel to send the console output to the serial port if that's where you'd like to see it appear, which for the malta board I think you can do by using "console=ttyS0" instead. Alternatively, you can drop '-nographic', make sure your kernel has the driver for the VGA card built in, and leave "console=tty0" and you'll see the console on the virtual console on the graphical window.
If you look at the README for the website you downloaded your image files from you'll see that it does indeed suggest using "console=ttyS0".
QUESTION
I have a Jenkinsfile that looks like
...ANSWER
Answered 2021-Mar-12 at 23:23The thing that was tripping me up was I had run this as -u root
many times and I only have one agent (don't ask) and jenkins caches the workspace directory. So the file permissions had been changed in that code by the docker container running as root. So when I got rid of -u root
and it started using the jenkins user it didn't have rights to some files and directories.
The solution was to delete the workspace and make sure that all make calls had an export HOME=${WORKSPACE}
before any command.
There might be a better way to export HOME but this solves the prob
QUESTION
I'm having a problem when i try to save my JSON data into a database. Right now, i have this code here:
My service that retrieves and cache data from an API with the given parameter cep
:
ANSWER
Answered 2021-Feb-21 at 10:37You don't seem to be using any library that handles dynamic mapping of your parameters to the required ordinal format into the query itself(like pg-parameterize) so the line:
const sql = 'INSERT INTO public.city(cep, logradouro, complemento, bairro, localidade, uf, ibge, gia, ddd, siafi) VALUES ?';
and more specifically the VALUES ?
part shouldn't be doing anything useful. Change that to:
const sql = 'INSERT INTO public.city(cep, logradouro, complemento, bairro, localidade, uf, ibge, gia, ddd, siafi) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)';
as the pg
npm package is using ordered parameters for parameterized queries.
Checkout the "Parameterized query" section in the docs for queries.
EDIT:You're either inserting the new record or getting an error. There is no other option. If you don't see any new record in the db after refresh, then you're just swallowing the error result in your code. As you're going the async/await
promise route, the code await pool.query(sql, values);
will throw if something goes wrong.
Then, in your caller:
QUESTION
I'm having a problem right now when i want to remove some code out of my route to put it into a service. I'm just trying to follow the best practices of developing an application.
This is my route right now:
...ANSWER
Answered 2021-Feb-20 at 20:50You have created a high-order function by returning a function in verificaCache()
, so to properly call it you need to do it like that await verificaCache(cep)(req, res)
, remember, the first time you call it, you have a function being returned, since you want the tasks inside of that function to be executed, you need to call it as well.
Take a reading about high-order functions here: https://blog.alexdevero.com/higher-order-functions-javascript/
My recommendation, you could just get rid of the other function you are returning to simplify your code, and let the service only handle business logic, all the http actions should be handled on the controller level:
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