Posted on Feb 2, 2022 • Originally published at aunicorndev.hashnode.dev

Supa-Fast API (Supabase FastAPI) : Deploying on DETA

#fastapi #supabase #database #deployment

In this last part of the tutorial of the series,we will be looking at deploying the FastAPI that we build in the last tutorial.

We have our Supa-Fast API working on our local system.. But will we be able to deploy it easily????

To my surprise, DETA has made it relatively easy to deploy the API..

I hit some roadblocks while deploying (OBVIOUSLYYYY) and shared a trick that might work for you like it did for me.

About Deta

As stated on their official website docs,

Deta is a free cloud crafted with the developer and user experience at heart.

What about Pricing??

It's FREE.FOREVER.

Yes, their motto states

We want anyone, at any age from anywhere in the world to experiment and build their ideas without worrying about limits of credit cards.

Prepare your Local Environment

If you have been following the previous tutorials, we have been using virtualenv and have only a limited dependencies in our virtualenv

To get the list of installed dependencies for the project , go to the api directory and run the command

pip freeze > requirements.txt

This will create a requirements.txt file in the api directory.

#requirements.txt anyio==3.4.0 asgiref==3.4.1 atomicwrites==1.4.0 attrs==21.2.0 certifi==2021.10.8 chardet==4.0.0 charset-normalizer==2.0.8 click==8.0.3 colorama==0.4.4 dataclasses==0.6 deprecation==2.1.0 fastapi==0.70.0 gotrue==0.2.0 h11==0.12.0 httpcore==0.13.7 httptools==0.2.0 httpx==0.19.0 idna==2.10 importlib-metadata==4.8.2 iniconfig==1.1.1 packaging==21.3 pluggy==1.0.0 postgrest-py==0.5.0 py==1.11.0 pydantic==1.8.2 pyparsing==3.0.6 pytest==6.2.5 python-dateutil==2.8.2 python-dotenv==0.19.2 PyYAML==6.0 realtime-py==0.1.3 requests==2.25.1 rfc3986==1.5.0 six==1.16.0 sniffio==1.2.0 starlette==0.16.0 supabase==0.0.3 toml==0.10.2 typing_extensions==4.0.0 urllib3==1.26.7 uvicorn==0.15.0 watchgod==0.7 websockets==9.1 zipp==3.6.0

Make sure you have the .env file with the environment variables as the API won't get deployed in case you missed that step in the last tutorial.

Working with DETA

To start, install the DETA CLI in powershell and login into deta using the following commands..

//The below command for install is for Windows iwr https://get.deta.dev/cli.ps1 -useb | iex deta login

To get the list of available commands, run deta --help

We'll create a new deta micro for the supafast-api after navigating to the api folder from the last tutorial

deta new

// Response on running deta new command Successfully created a new micro { "name": "api", "id": "XXXX_XXXXX_XXXXX_XXXX_XXXX_XXXX", "project": "XXXXXXX", "runtime": "python3.9", "endpoint": "XXXXXXXXXX", "region": "XXXXXXXX", "visor": "enabled", "http_auth": "disabled" }

The above command will install the dependencies listed in the requirements.txt on our new micro and will be visible on the Deta web interface.

In the previous tutorial, we added a .env file for the local environment, but for this created Deta instance, we don't have any environment variable defined. To solve that, run the following command while in the api directory.

deta update -e .env

And our API is available at https://e5w1sl.deta.dev/docs to check out 🤝🤝.

Your API url can be found on the DETA Dashboard as above.

If you want to open up the endpoint to public, run the command

deta auth disable //Response from CLI Successfully disabled http auth

Not Getting Any OUTPUT ?????

If you face an error (like me) on running your API in the browser with a response :

Bad Gateway The micro ran into an error while processing the request. If you are the owner of the micro, please check your logs. If the response took around 10s, it might be due to the time out limit.

Run deta logs and try if you can find any error in the logs..

For example, this is the error I got in my logs

[ERROR] AttributeError: module 'typing' has no attribute '_ClassVar' Traceback (most recent call last):   File "/var/lang/lib/python3.9/importlib/__init__.py", line 127, in import_module     return _bootstrap._gcd_import(name[level:], package, level)   File "<frozen importlib._bootstrap>", line 1030, in _gcd_import   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load   File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked   File "<frozen importlib._bootstrap>", line 680, in _load_unlocked   File "<frozen importlib._bootstrap_external>", line 850, in exec_module   File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed   File "/var/task/_entry.py", line 1, in <module>     from detalib.handler import handle   File "/opt/python/detalib/handler.py", line 3, in <module>     from . import handlers   File "/opt/python/detalib/handlers.py", line 3, in <module>     from .adapters.asgi import Asgi   File "/opt/python/detalib/adapters/asgi/__init__.py", line 1, in <module>     from .adapter import Asgi # noqa   File "/opt/python/detalib/adapters/asgi/adapter.py", line 7, in <module>     from .lifespan import Lifespan   File "/opt/python/detalib/adapters/asgi/lifespan.py", line 9, in <module>     class Lifespan:   File "/opt/python/dataclasses.py", line 958, in dataclass     return wrap(_cls)   File "/opt/python/dataclasses.py", line 950, in wrap     return _process_class(cls, init, repr, eq, order, unsafe_hash, frozen)   File "/opt/python/dataclasses.py", line 800, in _process_class     cls_fields = [_get_field(cls, name, type)   File "/opt/python/dataclasses.py", line 800, in <listcomp>     cls_fields = [_get_field(cls, name, type)   File "/opt/python/dataclasses.py", line 659, in _get_field     if (_is_classvar(a_type, typing)   File "/opt/python/dataclasses.py", line 550, in _is_classvar     return type(a_type) is typing._ClassVar [2021-11-11T00:32:56+05:30] Unknown application error occurred

For this particular error, the problem is with the dataclasses package in the requirements and we will remove it to get the correct output.

For that, run the following commands

pip uninstall dataclasses pip freeze >requirements.txt //run this in powershell deta deploy

Now on running the Deta Micro with the URL (https://e5w1sl.deta.dev/themes)

// 20211130191258 // https://e5w1sl.deta.dev/themes { "data": [ { "id": 1, "created_at": "2021-11-26T15:28:21+00:00", "monsterTheme": "demo-theme-1", "monsterThemeBg": "https://jtpcokcjjqbizziufohl.supabase.co/storage/v1/object/public/supafast-api/themes/demo-theme-1.png" }, { "id": 2, "created_at": "2021-11-26T15:29:45+00:00", "monsterTheme": "demo-theme-2", "monsterThemeBg": "https://jtpcokcjjqbizziufohl.supabase.co/storage/v1/object/public/supafast-api/themes/demo-theme-2.png" }, { "id": 3, "created_at": "2021-11-26T15:30:04+00:00", "monsterTheme": "demo-theme-3", "monsterThemeBg": "https://jtpcokcjjqbizziufohl.supabase.co/storage/v1/object/public/supafast-api/themes/demo-theme-3.png" }, { "id": 4, "created_at": "2021-11-26T15:30:12+00:00", "monsterTheme": "demo-theme-4", "monsterThemeBg": "https://jtpcokcjjqbizziufohl.supabase.co/storage/v1/object/public/supafast-api/themes/demo-theme-4.png" }, { "id": 6, "created_at": "2021-11-26T15:30:21+00:00", "monsterTheme": "demo-theme-5", "monsterThemeBg": "https://jtpcokcjjqbizziufohl.supabase.co/storage/v1/object/public/supafast-api/themes/demo-theme-5.png" } ], "status_code": 200 }

For more interactive output of the API Documentation, use the URL (https://e5w1sl.deta.dev/docs) which is provided by Swagger UI.

And as Francesco says, NOT DEPLOY on FRIDAY!!!

Conclusion

With the API deployed, this series comes to an end🎉🎉✨✨.

In case you have any doubts or suggestions regarding the article(s), feel free to contact me on my email aunicorndeveloper@gmail.com or on Twitter at @aUnicornDev.

The API built in this series is used in the tabsMonster project. Everyone is more than welcome to checkout and contribute in this Open Source Project.