Calvin's Home

Basice Concepts

• REST
  REpresentational State Transfer is a software architectural style.
• RESTful
  A web API that obeys the REST constraints is informally described as RESTful:
  • A client-server architecture made up of clients, servers, and resources, with requests managed through HTTP
  • Access resources via URI and URL-encoded parameters
  • Use of JSON or XML to transmit data.
  • Stateless client-server communication
  • Cacheable

In this post, I will share how to set up a continuous integration and continuous delivery (CI/CD) pipeline on AWS for API gateway. The following AWS services will be used:

• Cloudformation allows you to model your entire infrastructure and application resources
• CodePipeline is a continuous delivery service
• CodeCommit is a version control service
• CodeBuild is a fully managed build service in the cloud
• Simple Storage Service (Amazon S3) is storage for the Internet
• API Gateway is an AWS service for creating, publishing, maintaining, monitoring, and securing REST, HTTP, and WebSocket APIs
• AWS Lambda is a serverless compute service

Suppose I want to upload MaxMind GeoIp city database to AWS, and make it as Lambda layer.

• AxCrypt - Encrypt / decrypt files
• Greenshot - Making screenshots
• PDFsam Basic - Rotate, split, extract and merge PDF files
• Visual Studio Code - Code editing

Ubuntu 16.04.4 LTS AEM 6.4

• Use Python script to get the Reference of a page in AEM
  • Use your own AEM admin password HTTPBasicAuth('admin', 'password')
  • XPath to get all incomingLinks
  • Install lxml (please refer to Use Python to read HTML element by XPath)

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    from lxml import html import requests # print (requestURL) page = requests.get("http://localhost:4502/mnt/overlay/wcm/core/content/sites/jcr:content/rails/references/items/references.provider.html?item=/content/mysite/intl/en/test", auth=requests.auth.HTTPBasicAuth('admin', 'password')) # print (page.content) content = html.fromstring(page.content) links = content.xpath('//section[@data-type="incomingLinks")]/@data-path') # Remove duplicate links links = list(set(links)) for link in links: print (link)

• Run the script

  1	python3 test.py

Ubuntu 16.04.4 LTS

• Use Python 3 to read an HTML element attribute: data-endpoint by XPath and lxml

Get all hyperlinks

• Get all hyperlinks and remove line breaks

  var links = document.getElementsByTagName("a"); for(var i=0; i<links.length; i++) { console.log(jQuery.trim(links[i].href) + "," + jQuery.trim(links[i].innerText).replace(/(?:\r\n|\r|\n)/g, '')); }

On Standby

1. Stop the synchronization process
2. Stop AEM service

   sudo service aem stop`

3. Check AEM java process is terminated

   $ ps -ef | grep java
   calviny  10755 10409  0 11:55 tty1     00:00:00 grep --color=auto java

4. scp -pr /aem/author.primary aem-user@author2:/aem/author.standby
5. Delete sling.id.file

   $ cd crx-quickstart/launchpad
   $ find . -name sling.id.file
   ./felix/bundle12/data/sling.id.file
   $ rm ./felix/bundle12/data/sling.id.file
   

6. Update the run mode to standby in crx-quickstart/bin/start

   CQ_RUNMODE='author,nosamplecontent,prod,standby,aws'

7. Start AEM service

   sudo service aem start`

Node.js® is a JavaScript runtime built on Chrome’s V8 JavaScript engine.

npm

npm is the default package manager for the JavaScript runtime environment Node.js

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# Install package
npm install package-name

# Check outdated packages
npm outpdated

# Run arbitrary package scripts in package.json
npm run

nodemon

• nodemon will read the package.json for the main property
• nodemon will also search for the scripts.start property in package.json

Documentation

exports / require

module.exports is used for defining what a module exports and makes available through require()
(1) The exports variable is available within a module’s file-level scope, and is assigned the value of
module.exports before the module is evaluated.

(2) However, be aware that like any variable, if a new value is assigned to exports, it is no longer bound to module.exports

Manage Node.js versions

npm install installs dependencies into the node_modules/ directory
npm run build does nothing unless you specify what “build” does in your package.json file

AWS has announced the end of support for Node.js 10.x. Hence, I have to upgrade our existing Node.js 10.x Lambda functions to 14.x.