aws, node.js, express, lambda

1. AWS
Node.js, Express & Lambda

2. After creating EC2 instance, open an http port 3000
that the Express http server uses.
Head over to the Security Groups settings > Inbound

3. Install Gcc, Make and Git
> sudo yum install gcc-c++ make
> sudo yum install openssl-devel
> sudo yum install git
> git clone git://github.com/nodejs/node.git
Clone Node.js repo
> cd node
> ./configure
> make
> sudo make install
Build Node.js

4. Create an Hello World server with Node.js
> vi hello.js
> node hello.js

5. Install express
> npm install express
> vi hello_express.js
> node hello_express.js

6. Install express-generator
> npm install -g express-generator
> express sample1
> cd sample1 && npm install
> DEBUG=sample1:* npm start
/usr/local/bin/express -> /usr/local/lib/node_modules/express-generator/bin/express
> curl http://localhost:3000

7. Express Application Structure
package.json
bin/www
app.js
configuration file
entry point
routing
routes/index.js
action handler
views/*.jade
Jade HTMLtemplate
public/*.js, *.css
JS, CSS

8. Jade - HTML template engine
layout.jade parent template file
index.jade extends layout.jade, mixed in the block part

9. String Interpolation #{expression}
{ title: ‘Express’ }

10. Just, head over to Jade web site. It is really awesome.
http://jade-lang.com/reference/

11. AWS Lambda

12. Three ways to invoke a lambda function - node.js
S3 Bucket
API Gateway
Clients
Node.js
Lambda
Push event
Route message
handler=function(e){
…
}
Rest API
Pull event
S3 Bucket

13. Testing a lambda function by sending an event manually
Expose a lambda function as myhandler1
Log

14. Push S3 ObjectCreated event to a lambda
S3:bucket:ObjectCreated -> a lambda

15. Executing a lambda via API Gateway using Rest API
Bind an endpoint to a lambda
return a JSON
Invoke a Rest API