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Problem with Flask-Caching/ Redis

9/18/2023

I'm trying to setup a simple caching mecanism to my Plotly Dash (Flask) application deployed to railway. I'm not being able to setup it correctly. Is this the correct implementation? Project ID: eda27a88-d8f4-495f-b917-1fd2269f5764

BBrody

9/18/2023

please setup a MONGO_URL and a REDIS_URL reference variable in your service variables https://docs.railway.app/develop/variables#reference-variables once done please provide a screenshot of your service variables

9/18/2023

Ok.

9/18/2023

Something like this?

BBrody

9/18/2023

please use reference variables, remove them, and have a look at the docs section I linked

9/18/2023

My mongo DB must be in the same project?

BBrody

9/18/2023

yes it does need to be

9/18/2023

I apologize for my knowledge level.

BBrody

9/18/2023

no worries, that looks good now now use those variables in your code when connecting to the database

9/18/2023

ok. I should use like this: variable = ${{MongoDB.MONGO_URL}} or variable = MONGO_URL of course option 1, good?

BBrody

9/18/2023

neither of those options are python related I think for python it's os.getenv() but definitely read the docs for that

9/19/2023

I will do it. Thanks for you fast and incredible help, really impressed by this support. It looks like its working. Any way I can assure the redis caching is working?

BBrody

9/19/2023

do something in your app that would put something in the cache, then use the data tab of redis to see if you have any cache entries

9/19/2023

Unfortunately no logs and no data saved.

BBrody

9/19/2023

and you dont have any database connection errors?

9/19/2023

Only a warning on redis db log

9/19/2023

BBrody

9/19/2023

im talking about in your own service

9/19/2023

I'm getting no errors in my service (https://heatmapteste2-production.up.railway.app/)

BBrody

9/19/2023

make sure you are either logging a success message or an error message for your database connections

9/19/2023

Looks good

BBrody

9/19/2023

can you show me the database connection code?

9/19/2023

BBrody

9/19/2023

you are still hard coding database variables, please use environment variables

9/19/2023

i will try to comment line 21

BBrody

9/19/2023

and you also aren't logging any success or error messages for the database connections

9/19/2023

BBrody

9/19/2023

okay thats looking much better

9/19/2023

Here is the updated code logging sucess or error mesages. And the variables arent hard coded

BBrody

9/19/2023

well done

9/19/2023

Thanks for your advice.

BBrody

9/19/2023

can i assume you have added the new variables to the service variables? can i see a screenshot?

9/19/2023

BBrody

9/19/2023

looking good and you arent getting any errors in the deployment logs?

9/19/2023

all good

BBrody

9/19/2023

how do you run this app locally?

9/19/2023

I didnt tried to run locally with the caching mechanism I would have to change the cache_type to something local aswell

BBrody

9/19/2023

you can still use the railway redis and mongo databases locally install the railway cli https://docs.railway.app/develop/cli#installation once you have that all setup and your service linked you can run railway run <the command you use to start the app locally> this will run the given command with the railway service variables available note: do not use any .env files for this, the variables in the .env file will overwrite the variables injected by railway run this way you could work out any bugs in your code locally without having to deploy to railway for every change

9/19/2023

Ok, tks for advice I will run it

BBrody

9/19/2023

👍

9/19/2023

Damn, I got some data on Redis running locally with railway CLI

9/19/2023

BBrody

9/19/2023

awsome, now go to your railway services settings and disable private networking

9/19/2023

done

9/19/2023

BBrody

9/19/2023

now do more stuff with the railway hosted app and see if you get more data in redis

9/19/2023

yeah thats working means its solved... i believe

BBrody

9/19/2023

awsome!

9/19/2023

Brody, you are a monster... I wish I had 10% of your knowledge. Awesome job! Kiss on your cheek and my regards from Brazil. I can't be thankfull enought. So its a good practice to build using railway CLI and railway env variables

BBrody

9/19/2023

it sure is, now you have no need for an .env file since you can safely store everything in your service variables

9/19/2023

are a monster of computing

BBrody

9/19/2023

thank you 🙂

9/19/2023

sorry to bother again, but why private networking was blocking my redis db?

BBrody

9/19/2023

good question, private networking takes 2 seconds to initialize and if your database connection timeout isnt set high enough funky things can happen, you wernt using private networking so the easiest option was simply disabling it

9/19/2023

tks! you would do a great teacher. You can consider this ticket closed. Tks a lot again.

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