## 背景

阿里云函数计算是事件驱动的全托管计算服务。通过函数计算，您无需管理服务器等基础设施，只需编写代码并上传。函数计算会为您准备好计算资源，以弹性、可靠的方式运行您的代码，并提供日志查询、性能监控、报警等功能。借助于函数计算，您可以快速构建任何类型的应用和服务，无需管理和运维。而且，您只需要为代码实际运行所消耗的资源付费，代码未运行则不产生费用。
![buried_point](https://data-analysis.cn-shanghai.log.aliyuncs.com/logstores/article-logs/track_ua.gif?APIVersion=0.6.0&title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=)
移动应用的打包和分发呈现明显的峰谷效用，用户常常需要短时间内准备大量资源保障分发的实时性，完成分发后又需要及时释放资源，降低成本。这里我们提供一个 [fun](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fgithub.com%2Falibaba%2Ffuncraft) 模板，帮助我们更快地搭建一个基于[函数计算](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fhelpcdn.aliyun.com%2Fproduct%2F50980.html)构建 Serverless 架构的包分发服务，在开发运维效率，性能和成本间取得良好的平衡。

在分包过程中，下载/修改/上传是一个比较消耗资源的任务，需要消耗大量的计算/网络资源。并且分包任务只在应用发布新版本时才会发生，需要在尽可能短的时间内完成。针对这种有明显波峰波谷的场景，非常适合使用函数计算来完成。更重要的是这个服务是具有弹性伸缩和高可用能力的。

## apk 分包简介

![apk_](https://yqfile.alicdn.com/37ed4a5db0da73f5224ac7e2195732da960fc4e2.jpeg)

更多参考[函数计算--Serverless 微服务实践-移动应用包分发服务](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fyq.aliyun.com%2Farticles%2F699972)。

## 准备工作：

### 1.安装 node

```bash
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.5/install.sh | bash
nvm install 8
```

### 2.安装 fun 工具

```bash
npm install @alicloud/fun -g
```

fun 工具的某些子命令可能会用到 docker，所以你需要安装好 docker，具体参考文档：[Fun 安装教程](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fgithub.com%2Faliyun%2Ffun%2Fblob%2Fmaster%2Fdocs%2Fusage%2Finstallation-zh.md)。

### 3.apk 包准备

在这个实验中，我们会使用一个示例的 apk 包，可以从这里下载 [qq-v2.apk](https://yq.aliyun.com/go/articleRenderRedirect?url=http%3A%2F%2Ffc-imm-demo-cici.oss-cn-hangzhou.aliyuncs.com%2Fapk%2Fqq-v2.apk)。

下载 [qq-v2.apk](https://yq.aliyun.com/go/articleRenderRedirect?url=http%3A%2F%2Ffc-imm-demo-cici.oss-cn-hangzhou.aliyuncs.com%2Fapk%2Fqq-v2.apk) ，上传到自己的 oss bucket中：

![apk_](https://yqfile.alicdn.com/48f891d5d7c97c93999cb4363240161e7873caf5.png)

## 快速开始:

### 1.通过 fun 模板生成项目骨架

使用 `fun init` 命令可以快捷的将本模板项目初始化到本地，执行命令 ：

```powershell
$ fun init -n apk https://github.com/coco-super/package-distribution-service-for-serverless
start cloning...
Cloning into '.fun-init-cache-2fc2d680-eeff-11e9-a930-6fd4d1ac6506'...
remote: Enumerating objects: 23, done.
remote: Counting objects: 100% (23/23), done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 23 (delta 0), reused 18 (delta 0), pack-reused 0
Unpacking objects: 100% (23/23), done.
finish clone.
? Please input a oss bucket name? sunfeiyu
Start rendering template...
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/.funignore
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/pom.xml
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/src
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/src/main
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/src/main/java
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/src/main/java/example
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/src/main/java/example/App.java
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/target
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/target/classes
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/target/classes/example
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/target/classes/example/App.class
+ /Users/ellison/simple-fc-uncompress-service-for-oss/apk/template.yml
finish rendering template.
```

其中 -n 表示要作为文件夹生成的项目名称。默认值是 fun-app。更多fun init 命令格式选项说明请参考云栖文章[开发函数计算的正确姿势 —— 使用 Fun Init 初始化项目](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fyq.aliyun.com%2Farticles%2F674363)。

执行 `fun init`后会提示：输入一个 oss 的 bucket，注意 oss Bucket 是全球唯一的，如已经被占用了，请换一个新的名称或者一个已经创建好的（已经创建好的，请确保 region 一致）。

ps: 输入的内容和 **apk 包准备**中提到的 oss bucket name 是同一个，本示例为：`sunfeiyu`

### 4. 编译
在模版项目的根目录下执行 `fun build` 命令编译：

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

building apk/apk
running task flow MavenTaskFlow
running task: MavenCompileTask
running task: MavenCopyDependencies
running task: CopyMavenArtifacts

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
```

关于 Fun build 构建函数详细请参照云栖文章 [开发函数计算的正确姿势 —— 使用 Fun Build 构建函数](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fyq.aliyun.com%2Farticles%2F719102)。

### 5.服务部署
在模版项目的的根目录下执行 `fun deploy` 部署到云端。

```powershell
$ fun deploy
using template: .fun/build/artifacts/template.yml
using region: cn-shanghai
using accountId: ***********8320
using accessKeyId: ***********mTN4
using timeout: 60

Waiting for service apk to be deployed...
        make sure role 'aliyunfcgeneratedrole-cn-shanghai-apk' is exist
        role 'aliyunfcgeneratedrole-cn-shanghai-apk' is already exist
        attaching policies AliyunOSSFullAccess to role: aliyunfcgeneratedrole-cn-shanghai-apk
        attached policies AliyunOSSFullAccess to role: aliyunfcgeneratedrole-cn-shanghai-apk
        Waiting for function apk to be deployed...
                Waiting for packaging function apk code...
                The function apk has been packaged. A total of 15 files files were compressed and the final size was 3.13 MB
        function apk deploy success
service apk deploy success
```

### 6.执行函数

提供两种方式：

1. 登陆阿里云函数计算[控制台](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Ffc.console.aliyun.com)，手动执行。

![_](https://yqfile.alicdn.com/1ee0d5a56b98dc17f6e71460641d49b730b330bc.png)

2. 项目根目录下 `fun invoke apk` 命令远端调用：

```powershell
$ fun invoke apk
using template: template.yml
========= FC invoke Logs begin =========
FC Invoke Start RequestId: 23f34cc4-0cd3-40e0-9a04-f6586cf29be6
2019-10-14 17:06:35.971 [INFO] [23f34cc4-0cd3-40e0-9a04-f6586cf29be6] cmd: java -jar /code/walle-cli-all.jar put -c aliyun-fc /tmp/input.apk /tmp/output.apk
2019-10-14 17:06:36.152 [INFO] [23f34cc4-0cd3-40e0-9a04-f6586cf29be6] Success!

FC Invoke End RequestId: 23f34cc4-0cd3-40e0-9a04-f6586cf29be6

Duration: 666.13 ms, Billed Duration: 700 ms, Memory Size: 1024 MB, Max Memory Used: 254.55 MB
========= FC invoke Logs end =========

FC Invoke Result:
Success
```

## 查看结果

登陆 oss 查看已经生成新的 apk 包：

![_apk_](https://yqfile.alicdn.com/0f6355cdca00be7398a74d5b49efe192080b7db0.png)

将 oss 中 qq-v2-signed.apk 下载到本地。

查看渠道信息是否写入：

```powershell
~/Downloads                                                                                                                                             ⍉
$ java -jar /Users/ellison/Downloads/walle-cli-all.jar show qq-v2-signed.apk
/Users/ellison/Downloads/qq-v2-signed.apk : {channel=aliyun-fc}
```

渠道信息 `{channel=aliyun-fc}` 已写入，成功！

## 参考阅读

1. [Fun (Fun with Serverless) 工具](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fgithub.com%2Faliyun%2Ffun%2F)
1. [Fun Init 自定义模板](https://statistics.functioncompute.com/?title=Serverless%20%E5%BE%AE%E6%9C%8D%E5%8A%A1%E5%AE%9E%E8%B7%B5-%E7%A7%BB%E5%8A%A8%E5%BA%94%E7%94%A8%E5%8C%85%E5%88%86%E5%8F%91%E6%9C%8D%E5%8A%A1%EF%BC%88Fun%203.0%20%E5%8D%87%E7%BA%A7%E7%89%88%EF%BC%89&author=%E5%AD%99%E9%A3%9E%E5%AE%87&src=&url=https%3A%2F%2Fyq.aliyun.com%2Farticles%2F674364)

>“[阿里巴巴云原生](https://developer.aliyun.com/group/alisoftwaretech/)关注微服务、Serverless、容器、Service Mesh 等技术领域、聚焦云原生流行技术趋势、云原生大规模的落地实践，做最懂云原生开发者的技术圈。”

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