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I have a small flask app I want to deploy on my server and I'd like to be able to monitor it via an HTTP web interface. I don't need something complicated and I definitely don't want something that's difficult to set up. Previously I've used the Google App engine and the functionality in the Logs tab is completely fine.
The app is served through nginx & gunicorn and uses redis (w/ py-redis) and sqlite (w/ peewee). Ideally I'd like to be able to check the logs for all parts of the system from one place. Is this possible? What's the easiest way?
There is no definitive answer to the predicament and it would be whatever way you are most comfortable with.
You could change all your logging to write to a central database then create a small program which would scrape this data for you. This method also includes configuring a central syslog server:
http://www.linuxjournal.com/content/creating-centralized-syslog-server
What ever way you want to read these files is fine and all depends how much control you want. You could simply name all the logs based on hostname and rsync them to a central server from where you could parse them.
There are also free tools out there which will aid you in choosing you method take a look at:
http://www.linuxjournal.com/content/creating-centralized-syslog-server
There are also some proprietary systems you could use, such as Splunk:
http://www.splunk.com/
This is by no means a definitive list but should aim you in the right direction.
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I have just learned python, and am beginning to make a web application using Django / DRF in the back end.
The back end would be similar to a CRUD, or just a CRUD actually, I'm not planning on doing too much processing on requests, but would be queuing jobs for another python script on the server to pick up when needed.
The API I'm building would need to manage a few different entities like Users, Packages, Transactions, Jobs etc, and I plan to manage all of these entities... no ... models... via a rest API.
Do I create an app for each model ? e.g. user_app, package_app, and transaction_app ? or should I create a single app to manage them all?
I'm torn between thinking of Django Apps as actual applications, or Bundles like in PHP/Symfony
There is no obligation to create a new app for every feature that depends on another part of the project logic.
But overall the more you divide into, the easier it will be in the future.
when the project updated and new features added it will be easy to manage it.
Also take a look at some open source projects.
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Is there any way, through code, to prevent your app from idling? I'm thinking something like what is being done here. How to do this through code, but in python/django as that is what my app is done in, i.e. what is the equivalent in python to Node's setInterval. What are the disadvantages of using a pinging service over doing it through code(other than if the site goes down your app wont get pinged). Can you recommend a good pinging service? Thanks in advance.
You cannot do it from within the application. It needs to be woken up "externally". This can be just another Heroku application but that kind of defeats the purpose. There are some Heroku add ons that allow you to monitor your website thus also pinging it in regular intervals.
For example:
https://elements.heroku.com/addons/newrelic
With this your website would always stay awake.
The article you linked is imo more complicated than necessary. If you own a VPS you could host your website there. You could also write a curl command save it as a shell script and call it from cron (https://help.ubuntu.com/community/CronHowto).
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So basically, what I want to do is have a user input some data in an HTML form or something (on client end). Have that data be carried over to a server, where the data is put through some python code and the processed result is sent back to the client. I know, I could use javascript to do this on the user side itself, but I want to experiment a bit and make use of some libraries like tensorflow, matplotlib and so on.
Also, is there some way, you know like Web Assembly to run python code on the client side. Like maybe, send data from server or have it fed by the user, and on some virtual environment type setup and processed ??
Note: I know flask exists and I've tried it, but I can't see the same flexibility as you know regular python code.
Thanks in advance 😊
There won't come a definite answer to your question because your question is too broad. But maybe this will give you some starting points.
I see you have two questions:
How can I use python server side
How can I use python client side
Question 1:
First of all you might know that it makes sense to perform operations on a server and not on a client. For example interacting with a central database.
Flask is already lightweight compared to Django which also uses python. If you really want to do a lot on your own you could take a look at websocket or common gateway interface (cgi).
Question 2: This is really not recommended but if you want to play around with WebAssembly and Python a good starting point is PyPyJs: https://github.com/pypyjs/pypyjs!
You can use Brython in the browser, it's pretty spiffy. Full dom-manipulation from python; fully compatible with libraries written in pure python. Really neat stuff.
As for the server-side, if you want to keep it full-python, you'll need to use something like flask, bottle, cherrypy, aiohttp,...
If you find yourself struggling; maybe try starting out writing a simple socket-based microservice? You'll then be able to either farm requests out to it from any other server; or incorporate the code in your (python) server code.
Good luck!
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I'm diving into Django to create a webapp.
The thing is, I'm not sure if my app is too simple for what Django offers.
My app will download the latest CPI figures and convert your (monetary) dataset into inflation-adjusted figures, going way back in decades. The user pastes their data in via a textbox. It certainly won't need SQL.
I may want to expand the project with more features in future.
Is it advisable to go with a more lightweight framework for something as simple as I've described?
Every framework has its pros and cons. There are many different frameworks. Personally I prefer Flask but it is all personal preference. Here are some articles that help describe the differences:
https://www.airpair.com/python/posts/django-flask-pyramid
https://www.reddit.com/r/Python/comments/1yr8v5/django_vs_flask/
https://www.hakkalabs.co/articles/django-and-flask
A webapp like the one you describe sounds like most of the work can happen on the client side, without sending the data back to server. From what it sounds like, you simply need to make a few calculations and present the data in a new way.
For this I don't recommend Django, which is ideal for serving pages and managing relational DB content, but not really useful for client side work.
I'd recommend AngularJS
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Web2py looks like a very nice Python framework but I am wondering if it is suitable to use for a large public web site. What sorts of issues might I run into? I'm not worried about technical scalability so much as UI/UX limitations, ability to connect other components, etc.
web2py is a very capable web server application framework. UI/UX (User interface / Experience) limitations does not arises usually from a server framework.
There are quite a number of free application that demonstrates it's capabilities:
http://www.web2py.com/appliances
If you want to compare it with other server frameworks, there are quite a few documents out there that you can read on.
Django, Turbo Gears, Web2Py, which is better for what?
The following discussion should add to information here
Anyone out there using web2py?
You have to be more specific to make a judgement or evaluate a server framework than what you have mentioned.
[Edit: based on comments]
While the examples in the link provided by mdipierro may not inspire confidence with regard to desired UI/UX solutions. It would be premature to consider that because of web2py or any other server framework. It might point to the fact that all these are implemented by a resource constrained team.
You might take a look at this list of sites powered by web2py.