IBM Bluemix OpenWhisk

Joseph Chang| IBM Cloud Architect | changhs@tw.ibm.com

• Openwhisk Programing Model• Let’s do it

– Install Command Line– Trigger action from Cloudant– Trigger action from Http Request– Define Trigger-Event for Node-Red

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Openwhisk Programing Model

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From:

Openwhisk Programming model

• Services define the events they emit as triggers, and developers associate the actions to handle the events via rules

• The developer only needs to care about implementing the desired application logic - the system handles the rest

T AR

Programming model

Trigger: „A class of events that can happen“T

Programming model

Actions: „An event-handler, i.e. code that runs in response to an event“A

Programming model

Actions: Multi-runtime support, e.g. JavaScriptA

function main(msg) {return { message: 'Hello, ' + msg.name + ' from ' +

msg.place };};

Programming model

Actions: Can be chained to create sequences to increase flexibility and foster reuse

A

AA := A1 + A2 + A3

AB := A2 + A1 + A3

AC := A3 + A1 + A2

Programming model

Rules: „An association of a trigger and an action“R

R := T A

Want to try it out?

• You want to try OpenWhisk on your own?– Want to try out our IBM Bluemix OpenWhisk offering?

• Sign-up today at: https://new-console.ng.bluemix.net/openwhisk/– Want to try out our open-source OpenWhisk offering?

• Visit: https://developer.ibm.com/openwhisk/

Whisk 命令列操作練習

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Install Openwhisk command line tool

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開啟 https://new-console.ng.bluemix.net/openwhisk

點選Configure CLI

Openwhisk command line tool

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Mac 使用者 依指示完成命令列設定 , Win 使用者請看次頁

Openwhisk command line tool

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Windows 使用者請下載安裝 Python 開啟 , 安裝完畢即可使

用 pip

https://www.python.org/downloads/windows/

pip install --upgrade https://new-console.ng.bluemix.net/openwhisk/cli/download

然後執行前頁的1,2,3,4 步驟 , 注意步驟 1 在 windows 是不需要 sudo 的

當 Cloudant DB 有異動時 , 觸發 Whisk Action

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Exercise – 當 Cloudant DB 有異動時 , 觸發 whisk Action

}Event Providers

OpenWhisk

Cloudant

Git

Weather

…

…

Data event occurs, e.g.-Commit on a Git Repository-CRUD operation on Cloudant-….

Trigger execution of associated OpenWhisk action

…JS Swift Docker …

Update 一筆Document

顯示那一筆資料被異動 2 1

Write your whisk application

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點選 Edit

Write your whisk application

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1. 閱讀sample code

2. Click “Create An

Action”

Write your whisk application

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填寫 Action 名稱

使用 template

Write your whisk application

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範例程式產生

我們要修改output, 讓它顯示被修改的欄位

Get Cloudant Setting Info

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1. 點選此處開啟選單2. 用新分頁開啟資料分析 , 我們之後會在 whisk 與 cloudant 交替使用

Get Cloudant Setting Info

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2. 撰擇一個 Cloudant

NoSQL DB

1. 若尚未建立請建一個新的 Cloudant DB

Get Cloudant Setting Info

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點選服認證

Get Cloudant Setting Info

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1. 記下 username, password, host 等會兒要用到

2. 若此頁顯無認識證 , 請新增 一組

3. 回管理頁面

Create DB

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點選LAUNCH

Create DB

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點選 Create Database

為 DB 取個名字

記住 Database 名稱 , 等會兒要用到

Insert New Doc

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點選 + , 再選 +New Doc

Insert New Doc

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修改一下文件內容 , 加一些 欄位值可參考如下內容 ,完成後按

“ Create Document”

Insert New Doc

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系統自動 新 增 _rev 欄位 回到OpenWhisk 頁面

Enable Docs

Modify the Action

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1. 修改程式碼 , 讓被異動 的 doc id , 版本 顯示出來

function main(params) {return { "message": "The doc is changed " + params._id+":"+params._rev };

}

2. 按 Run it Now

Modify the Action

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點選 Run With These

Values

Modify the Action

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點選 Close

看到綠色邊及此訊息表示測試成功

Create a Trigger

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點選Automate This

Action Create a Rule

Create A Trigger

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點選CLOUDANT

changes

Create a Trigger

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點選 NEW TRIGGER

Create a Trigger

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完成後點選Save

Configuration

為 Trigger 取名字

Create a Rule

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檢查Trigger 是否新增 成功

檢查Trigger 是否新增 成功

Create a Rule

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點選 This Looks Good

系統將建立此 Rule

Create a Rule

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可修改Rule 名稱

點選 Save Rule

Create a Rule

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點選Enable Rule

Rule 已產生 , 但是處於 disable 狀態

Create a Rule

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1. 確認 Rule 是在 Enable 狀態

2. 點選Dashboard

View Dashboard

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Do some changes in Cloudant DB

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點選編輯

Do some changes in Cloudant DB

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修改一下Note, 或其它欄位

點選 Save Changes, 回到 Whisk DashBoard

View Dashboard Again

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點選勾勾可檢視完整 內容

由 Http Request 觸發 Whisk Action

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OpenWhisk: How does it work?

OpenWhisk

JS Swift Docker …

Incoming HTTP request, e.g.HTTP GET mynewcoolapp.com/customers

1 2 Invoke associated OpenWhisk action „getCustomers“

Browser

Mobile App

Web App

Variety of languages

開啟 Openwhisk 編輯器

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1. 選擇 Hello World With

Params 範例程式2. 點選 View

REST Endpoint

查看 Action 的 REST Endpoint

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端點及範例在此

點選 Show Full

Command

可以直接將內容複製到程式中使用

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Test Run

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由 Node-RED 觸發 Event

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從 Node-RED Trigger Openwhisk Event

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節點說明

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皆為預設值 , 無需調整

節點說明

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由 payload 回傳參數 , 需為 JSON Object 型式

Define trigger with wsk

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請先在 Command line 建立所需的 Triggerwsk trigger create <you trigger name>

Namespace Trigger name

Define trigger with wsk

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在 OpenWhisk – Command CLI 說明可以找到 Auth Key

Auth key

節點說明

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請將以上資訊填入

Test trigger

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點選 timstamp 以觸發 Openwhisk trigger

View Result in Dashboard

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收到由 Node-RED 觸發 的 Openwhisk Event

本單元結束