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sanic-dantic is a request parameter check and parsing library based on the sanic framework. It is based on pydantic and can help developers quickly check and get request parameters.

In many cases, we need to check and parse request parameters, but the sanic framework itself does not provide it, so we need to implement it ourselves. In most cases, you may need to do this:

from sanic import Sanic
from sanic.response import json

app = Sanic("SanicDanticExample")


@app.route('/example')
async def path_param_examples(request):
    name = request.get("name")
    age = request.get("age")
    if not isinstance(name, str) or not isinstance(age, int):
        return json({"error": "parameter type error"})
    return json({"message": f"hello {name} are you {age} years old ?"})

This code looks simple, but when your parameters become more and more, you will find that you need to write a lot. This is a bad implementation because it is not maintainable. So we need a better way to implement it.

sanic-dantic can help you quickly implement parameter checking and parsing.

You can install sanic-dantic through pip:

pip install sanic-dantic

You can also install it through the source code:

pip install git+https://github.com/miss85246/sanic-dantic.git

sanic-dantic depends on sanic and pydantic, their specific versions are:

sanic >= 20.3.0
pydantic >= 1.7.3

First, define the parameter check model through pydantic, then define the view function, and check and parse the parameters through the parse_params decorator.

from sanic import Sanic
from sanic.response import json

from sanic_dantic import parse_params, BaseModel, Field


# define params check model by pydantic.
class Person(BaseModel):
    name: str = Field(description="name of person")
    age: int = Field(default=18, description="age of person")


app = Sanic("SanicDanticExample")


# view function and check and parse params by `parse_params` decorator.
@app.route('/example')
@parse_params(path=Person)
async def path_param_examples(request, params):
    # request.ctx and params are parsed parameters
    print("ctx:", request.ctx.params)
    print("params:", params)
    print("name:", params.name)
    print("age:", params.age)

    return json({"ctx": request.ctx.params, "params": params})


if __name__ == "__main__":
    app.run(host="localhost", port=8000)

now you can test with curl:

curl -X GET "http://localhost:8000/example?name=Connor&age=18"

the response is:

{
  "ctx": {
    "name": "Connor",
    "age": 18
  },
  "params": {
    "name": "Connor",
    "age": 18
  }
}

and the console output is:

ctx: {'name': 'Connor', 'age': 18}
params: {'name': 'Connor', 'age': 18}
name: Connor
age: 18

more pydantic usage can see pydantic documentation。

more sanic-dantic advanced usage can see sanic-dantic documentation。

sanic-dantic is licensed under the GPL-3.0 License. If you want to use sanic-dantic for secondary development or commercial use, please follow the GPL-3.0 License.