FreeBSD系统下安装FastAPI

众所周知，在FreeBSD下安装有些python包会不太顺利，比如安装FastAPI

用pkg安装FastAPI

可以用pkg来安装：

pkg install py311-uvicorn py311-fastapi

但是这样安装后，运行fastapi可能会报错：

  File "/usr/local/lib/python3.11/site-packages/pydantic/_internal/_generate_schema.py", line 1520, in _typed_dict_schema
    td_schema = core_schema.typed_dict_schema(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: typed_dict_schema() got an unexpected keyword argument 'cls'

用pip安装FastAPI

这时候需要再用pip来安装。但是pip有些库装不上，这时候就要配合用pkg安装相关库。

先激活环境：

source py311/bin/activate.csh

然后使用pip安装： 

pip install ujson orjson markupsafe pydantic_core
pip install uvloop watchfiles

pydantic-core, httptools

手工安装了pydantic_core,结果安装fastapi的时候又需要安装，仔细一看，原来自己敲成了pydantic_core ，而需要的是pydantic-core，也就是最终执行命令：

pip install ujson orjson markupsafe
pip install uvloop watchfiles

pip install pydantic-core, httptools

最终安装完成：

pip install "fastapi[all]"

Successfully installed annotated-types-0.7.0 click-8.1.7 dnspython-2.7.0 email-validator-2.2.0 fastapi-0.115.4 fastapi-cli-0.0.5 httptools-0.6.4 itsdangerous-2.2.0 jinja2-3.1.4 pydantic-2.9.2 pydantic-core-2.23.4 pydantic-extra-types-2.9.0 pydantic-settings-2.6.0 python-multipart-0.0.16 starlette-0.41.2 typer-0.12.5 typing-extensions-4.12.2 uvicorn-0.32.0 websockets-13.1

如果安装过程中有库实在装不上，就用pkg search xx来找到FreeBSD下的pkg包，用pkg install py311-xx的方式来安装一下，然后再pip安装就能装上了，比如：

pkg install py311-watchfiles
pkg install py311-uvloop
pkg install py311-uvicorn

测试

测试源代码

将下面代码写入的dependsclass.py文件：

from fastapi import Depends, FastAPI

app = FastAPI()


fake_items_db = [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}]


class CommonQueryParams:
    def __init__(self, q: str | None = None, skip: int = 0, limit: int = 100):
        self.q = q
        self.skip = skip
        self.limit = limit


@app.get("/items/")
async def read_items(commons=Depends(CommonQueryParams)):
    response = {}
    if commons.q:
        response.update({"q": commons.q})
    items = fake_items_db[commons.skip : commons.skip + commons.limit]
    response.update({"items": items})
    return response

保存为dependsclass.py

启动服务：

uvicorn dependsclass:app --reload

 curl测试：

curl 127.0.0.1:8000/items/
{"items":[{"item_name":"Foo"},{"item_name":"Bar"},{"item_name":"Baz"}]}

 效果不错！

注意，FreeBSD下默认使用pf防火墙康，不要忘记打开防火墙的8000端口

调试：

启动uvicorn后报错

  File "/usr/local/lib/python3.11/site-packages/pydantic/_internal/_generate_schema.py", line 999, in match_type
    return self._typed_dict_schema(obj, None)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pydantic/_internal/_generate_schema.py", line 1520, in _typed_dict_schema
    td_schema = core_schema.typed_dict_schema(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: typed_dict_schema() got an unexpected keyword argument 'cls'

确认安装好fastapi，并更新该python3.11环境，再试后问题解决。