函数计算部署 FastAPI

阿里云的函数计算对WSGI协议支持较好，例如Flask。

但目前市场上介绍ASGI系列的文章不多（截止2020-05-18）。

本篇将介绍函数计算部署 FastAPI 框架。

默认你对工具 fun 有一定的了解

help.aliyun.com/document_de…

本demo部署后的效果

本demo代码地址

gitee.com/halfapple/m…

---

1.fun init

选择 “http-trigger-python3”模式，完成工程初始化。

2.调整template.ymal

• Runtime 改成 custom
• 添加一个domain 配置，具体内容：

ROSTemplateFormatVersion: '2015-09-01'
Transform: 'Aliyun::Serverless-2018-04-03'
Resources:
  my_fast:
    Type: 'Aliyun::Serverless::Service'
    Properties:
      Description: 'fastapi deploy with fun tools'
    my_fast:
      Type: 'Aliyun::Serverless::Function'
      Properties:
        Handler: index.app
        Runtime: custom
        CodeUri: './'
      Events:
        httpTrigger:
          Type: HTTP
          Properties:
            AuthType: ANONYMOUS
            Methods: ['POST', 'GET']
  my_domain:
    Type: 'Aliyun::Serverless::CustomDomain'
    Properties:
      DomainName: Auto
      Protocol: HTTP
      RouteConfig:
        Routes:
          '/*':
            ServiceName: my_fast
            FunctionName: my_fast

3. 调整 index.py

app的命名，保持与上一步配置的入口：“indexHandler: index.app”一致。

from fastapi import FastAPI


app = FastAPI(
    title="Deploy FastAPI with Funcraft",
    description="Deploy FastAPI with Funcraft",
    version="1.0.0",
)

@app.get("/")
def home():
    return "Deploy FastAPI with Funcraft"

4. 创建 Funfile

RUNTIME custom
RUN mkdir -p ~/.pip
RUN echo "[global]" >> ~/.pip/pip.conf
RUN echo "index-url = http://mirrors.aliyun.com/pypi/simple" >> ~/.pip/pip.conf
RUN echo "[install]" >> ~/.pip/pip.conf
RUN echo "trusted-host=mirrors.aliyun.com" >> ~/.pip/pip.conf
RUN fun-install pip install uvicorn
RUN fun-install pip install fastapi

• RUNTIME custom 表示Custom Runtime运行方式
• 中间几行调整pip的源，可以让本地安装环境时更顺利
• 最后两行属于业务需要的框架，即自己需要的第三方依赖，可以添加更多的第三方依赖

5. 创建 bootstrap

#!/bin/bash
uvicorn  index:app --host=0.0.0.0 --port=9000

• 5.1 bootstrap 需要可执行权限chmod +x bootstrap
• 5.2 bootstrap 需要添加 #!/bin/bash，不然会出错
• 5.3 需要监听 0.0.0.0:9000（或者*：9000），否则会超时，这个是它内部的规则。

6. 安装第三方依赖

#fun install

首次安装，会下载 runtime-custom 镜像，以及一些第三方依赖包，需要几分钟的时间

7. build

$ fun build 
using template: template.yml
start building function dependencies without docker

building my_fast/my_fast
Funfile exist, Fun will use container to build forcely
Step 1/8 : FROM registry.cn-beijing.aliyuncs.com/aliyunfc/runtime-custom:build-1.9.5
 ---> d9dc9b425320

......

Build Success

Built artifacts: .fun/build/artifacts
Built template: .fun/build/artifacts/template.yml

Tips for next step
======================
* Invoke Event Function: fun local invoke
* Invoke Http Function: fun local start
* Deploy Resources: fun deploy

8. 本地启动

#fun local start

确保本地运行ok，最后部署

9. deploy

#fun deploy -y

$ fun deploy 
using template: .fun/build/artifacts/template.yml
using region: cn-shanghai
using accountId: ***********0997
using accessKeyId: ***********dT9i
using timeout: 300

Collecting your services information, in order to caculate devlopment changes...

Resources Changes(Beta version! Only FC resources changes will be displayed):

┌──────────┬──────────────────────────────┬────────┬──────────┐
│ Resource │ ResourceType                 │ Action │ Property │
├──────────┼──────────────────────────────┼────────┼──────────┤
│ my_fast  │ Aliyun::Serverless::Function │ Modify │ CodeUri  │
└──────────┴──────────────────────────────┴────────┴──────────┘

? Please confirm to continue. Yes
Waiting for service my_fast to be deployed...
        Waiting for function my_fast to be deployed...
                Waiting for packaging function my_fast code...
                ......
                trigger httpTrigger deploy success
        function my_fast deploy success
service my_fast deploy success

...your url ...

Waiting for custom domain my_domain to be deployed...
custom domain my_domain deploy success

10. 测试访问

上一步骤部署成功后，会得到一个 url，直接浏览器访问即可。