## 背景

阿里雲函式計算是事件驅動的全託管計算服務。透過函式計算，您無需管理伺服器等基礎設施，只需編寫程式碼並上傳。函式計算會為您準備好計算資源，以彈性、可靠的方式執行您的程式碼，並提供日誌查詢、效能監控、報警等功能。藉助於函式計算，您可以快速構建任何型別的應用和服務，無需管理和運維。而且，您只需要為程式碼實際執行所消耗的資源付費，程式碼未執行則不產生費用。
![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=)
移動應用的打包和分發呈現明顯的峰谷效用，使用者常常需要短時間內準備大量資源保障分發的實時性，完成分發後又需要及時釋放資源，降低成本。這裡我們提供一個 [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，幫助我們更快地搭建一個基於[函式計算](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)構建 Serverless 架構的包分發服務，在開發運維效率，效能和成本間取得良好的平衡。

在分包過程中，下載/修改/上傳是一個比較消耗資源的任務，需要消耗大量的計算/網路資源。並且分包任務只在應用釋出新版本時才會發生，需要在儘可能短的時間內完成。針對這種有明顯波峰波谷的場景，非常適合使用函式計算來完成。更重要的是這個服務是具有彈性伸縮和高可用能力的。

## apk 分包簡介

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

更多參考[函式計算--Serverless 微服務實踐-移動應用包分發服務](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)。

## 準備工作：

### 1.安裝 node

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

### 2.安裝 fun 工具

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

fun 工具的某些子命令可能會用到 docker，所以你需要安裝好 docker，具體參考文件：[Fun 安裝教程](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 包準備

在這個實驗中，我們會使用一個示例的 apk 包，可以從這裡下載 [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)。

下載 [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) ，上傳到自己的 oss bucket中：

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

## 快速開始:

### 1.透過 fun 模板生成專案骨架

使用 `fun init` 命令可以快捷的將本模板專案初始化到本地，執行命令 ：

```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 表示要作為資料夾生成的專案名稱。預設值是 fun-app。更多fun init 命令格式選項說明請參考雲棲文章[開發函式計算的正確姿勢 —— 使用 Fun Init 初始化專案](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)。

執行 `fun init`後會提示：輸入一個 oss 的 bucket，注意 oss Bucket 是全球唯一的，如已經被佔用了，請換一個新的名稱或者一個已經建立好的（已經建立好的，請確保 region 一致）。

ps: 輸入的內容和 **apk 包準備**中提到的 oss bucket name 是同一個，本示例為：`sunfeiyu`

### 4. 編譯
在模版專案的根目錄下執行 `fun build` 命令編譯：

```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
```

關於 Fun build 構建函式詳細請參照雲棲文章 [開發函式計算的正確姿勢 —— 使用 Fun Build 構建函式](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.服務部署
在模版專案的的根目錄下執行 `fun deploy` 部署到雲端。

```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.執行函式

提供兩種方式：

1. 登陸阿里雲函式計算[控制檯](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)，手動執行。

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

2. 專案根目錄下 `fun invoke apk` 命令遠端呼叫：

```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
```

## 檢視結果

登陸 oss 檢視已經生成新的 apk 包：

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

將 oss 中 qq-v2-signed.apk 下載到本地。

檢視渠道資訊是否寫入：

```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}
```

渠道資訊 `{channel=aliyun-fc}` 已寫入，成功！

## 參考閱讀

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 自定義模板](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)

>“[阿里巴巴雲原生](https://developer.aliyun.com/group/alisoftwaretech/)關注微服務、Serverless、容器、Service Mesh 等技術領域、聚焦雲原生流行技術趨勢、雲原生大規模的落地實踐，做最懂雲原生開發者的技術圈。”

Serverless 微服務實踐-移動應用包分發服務

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