Metadata-Version: 2.1
Name: fastapi-code-generator
Version: 0.2.7
Summary: 
Home-page: https://github.com/koxudaxi/fastapi-code-generator
License: MIT
Author: Koudai Aono
Author-email: koxudaxi@gmail.com
Requires-Python: >=3.7.0,<4.0.0
Classifier: Development Status :: 2 - Pre-Alpha
Classifier: License :: OSI Approved :: MIT License
Classifier: Natural Language :: English
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: Implementation :: CPython
Requires-Dist: PySnooper (>=0.4.1,<0.6.0)
Requires-Dist: datamodel-code-generator[http] (>=0.11.3,<0.12.0)
Requires-Dist: jinja2 (>=2.11.2,<3.0.0)
Requires-Dist: pydantic (>=1.5.1,<2.0.0)
Requires-Dist: stringcase (>=1.2.0,<2.0.0)
Requires-Dist: typer[all] (>=0.2.1,<0.4.0)
Project-URL: Repository, https://github.com/koxudaxi/fastapi-code-generator
Description-Content-Type: text/markdown

# fastapi-code-generator

This code generator creates a FastAPI app from an openapi file.

[![PyPI version](https://badge.fury.io/py/fastapi-code-generator.svg)](https://pypi.python.org/pypi/fastapi-code-generator)
[![Downloads](https://pepy.tech/badge/fastapi-code-generator/month)](https://pepy.tech/project/fastapi-code-generator)
[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/fastapi-code-generator)](https://pypi.python.org/pypi/fastapi-code-generator)
[![codecov](https://codecov.io/gh/koxudaxi/fastapi-code-generator/branch/master/graph/badge.svg)](https://codecov.io/gh/koxudaxi/fastapi-code-generator)
![license](https://img.shields.io/github/license/koxudaxi/fastapi-code-generator.svg)
[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)


## This project is in experimental phase.

fastapi-code-generator uses [datamodel-code-generator](https://github.com/koxudaxi/datamodel-code-generator) to generate pydantic models

## Help
See [documentation](https://koxudaxi.github.io/fastapi-code-generator) for more details.


## Installation

To install `fastapi-code-generator`:
```sh
$ pip install fastapi-code-generator
```

## Usage

The `fastapi-code-generator` command:
```
Usage: fastapi-codegen [OPTIONS]

Options:
  -i, --input FILENAME     [required]
  -o, --output PATH        [required]
  -t, --template-dir PATH
  --install-completion     Install completion for the current shell.
  --show-completion        Show completion for the current shell, to copy it
                           or customize the installation.

  --help                   Show this message and exit.
```

## Example
### OpenAPI
```sh
$ fastapi-codegen --input api.yaml --output app
```

<details>
<summary>api.yaml</summary>
<pre>
<code>
openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger Petstore
  license:
    name: MIT
servers:
  - url: http://petstore.swagger.io/v1
paths:
  /pets:
    get:
      summary: List all pets
      operationId: listPets
      tags:
        - pets
      parameters:
        - name: limit
          in: query
          description: How many items to return at one time (max 100)
          required: false
          schema:
            type: integer
            format: int32
      responses:
        '200':
          description: A paged array of pets
          headers:
            x-next:
              description: A link to the next page of responses
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Pets"
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"
                x-amazon-apigateway-integration:
                  uri:
                    Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${PythonVersionFunction.Arn}/invocations
                  passthroughBehavior: when_no_templates
                  httpMethod: POST
                  type: aws_proxy
    post:
      summary: Create a pet
      operationId: createPets
      tags:
        - pets
      responses:
        '201':
          description: Null response
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"
                x-amazon-apigateway-integration:
                  uri:
                    Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${PythonVersionFunction.Arn}/invocations
                  passthroughBehavior: when_no_templates
                  httpMethod: POST
                  type: aws_proxy
  /pets/{petId}:
    get:
      summary: Info for a specific pet
      operationId: showPetById
      tags:
        - pets
      parameters:
        - name: petId
          in: path
          required: true
          description: The id of the pet to retrieve
          schema:
            type: string
      responses:
        '200':
          description: Expected response to a valid request
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Pets"
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"
    x-amazon-apigateway-integration:
      uri:
        Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${PythonVersionFunction.Arn}/invocations
      passthroughBehavior: when_no_templates
      httpMethod: POST
      type: aws_proxy
components:
  schemas:
    Pet:
      required:
        - id
        - name
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
        tag:
          type: string
    Pets:
      type: array
      description: list of pet
      items:
        $ref: "#/components/schemas/Pet"
    Error:
      required:
        - code
        - message
      properties:
        code:
          type: integer
          format: int32
        message:
          type: string
</code>
</pre>
</details>


`app/main.py`:
```python
# generated by fastapi-codegen:
#   filename:  api.yaml
#   timestamp: 2020-06-14T10:45:22+00:00

from __future__ import annotations

from typing import Optional

from fastapi import FastAPI, Query

from .models import Pets

app = FastAPI(version="1.0.0", title="Swagger Petstore", license="{'name': 'MIT'}",)


@app.get('/pets', response_model=Pets)
def list_pets(limit: Optional[int] = None) -> Pets:
    """
    List all pets
    """
    pass


@app.post('/pets', response_model=None)
def create_pets() -> None:
    """
    Create a pet
    """
    pass


@app.get('/pets/{pet_id}', response_model=Pets)
def show_pet_by_id(pet_id: str = Query(..., alias='petId')) -> Pets:
    """
    Info for a specific pet
    """
    pass

```

`app/models.py`:
```python
# generated by datamodel-codegen:
#   filename:  api.yaml
#   timestamp: 2020-06-14T10:45:22+00:00

from typing import List, Optional

from pydantic import BaseModel, Field


class Pet(BaseModel):
    id: int
    name: str
    tag: Optional[str] = None


class Pets(BaseModel):
    __root__: List[Pet] = Field(..., description='list of pet')


class Error(BaseModel):
    code: int
    message: str
```

## Custom Template
If you want to generate custom `*.py` files then you can give a custom template directory to fastapi-code-generator with `-t` or `--template-dir` options of the command.

fastapi-code-generator will search for [jinja2](https://jinja.palletsprojects.com/) template files in given template directory, for example `some_jinja_templates/list_pets.py`.

```bash
fastapi-code-generator --template-dir some_jinja_templates --output app --input api.yaml
```

These files will be rendered and written to the output directory. Also, the generated file names will be created with the template name and extension of `*.py`, for example `app/list_pets.py` will be a separate file generated from the jinja template alongside the default `app/main.py`

### Variables
You can use the following variables in the jinja2 templates

- `imports`  all imports statements
- `info`  all info statements
- `operations` `operations` is list of `operation`
  - `operation.type` HTTP METHOD
  - `operation.path` Path
  - `operation.snake_case_path` Snake-cased Path
  - `operation.response` response object
  - `operation.function_name` function name is created `operationId` or `METHOD` + `Path` 
  - `operation.snake_case_arguments` Snake-cased function arguments
  - `operation.security` [Security](https://swagger.io/docs/specification/authentication/)
  - `operation.summary` a summary

### default template 
`main.jinja2`
```jinja2
from __future__ import annotations

from fastapi import FastAPI

{{imports}}

app = FastAPI(
    {% if info %}
    {% for key,value in info.items() %}
    {{ key }} = "{{ value }}",
    {% endfor %}
    {% endif %}
    )


{% for operation in operations %}
@app.{{operation.type}}('{{operation.snake_case_path}}', response_model={{operation.response}})
def {{operation.function_name}}({{operation.snake_case_arguments}}) -> {{operation.response}}:
    {%- if operation.summary %}
    """
    {{ operation.summary }}
    """
    {%- endif %}
    pass
{% endfor %}

```

## PyPi 

[https://pypi.org/project/fastapi-code-generator](https://pypi.org/project/fastapi-code-generator)

## License

fastapi-code-generator is released under the MIT License. http://www.opensource.org/licenses/mit-license


