demo-function

demo-function

demo-function is a sample function showing AMP serverless computing features.

There are only 3 things to consider when writing a function:

• Get your input parameter from the standard input
• Write your output to the standard output
• If needed, log to the standard error

Installing locally

Run make, it will install demo-function in your $GOPATH/bin

Building an image

Run make image, it will create a docker image with the tag appcelerator/amp-demo-function:latest

Testing locally

After installing locally, you can test the function like this:

$ cat Dockerfile | demo-function

Registering your function

In order to register your function against amp, you need to run the following command:

$ amp fn create test appcelerator/amp-demo-function

Invoking your function via HTTP

In order to invoke a function, you can POST an HTTP request to localhost:4242/<function> (to be changed). Calls block until the function sends a response. Invoke your test function like this:

$ cat Makefile | curl localhost:4242/test --data-binary @-

The @- parameter tells curl to read from the standard input but you can also invoke your function like this:

$ curl localhost:4242/test --data-binary @Makefile

The --data-binary parameter tells curl to POST the content of the file exactly as specified with no extra processing whatsoever. Without this parameter, curl would pass the content of the file to the server using the content-type application/x-www-form-urlencoded which is not expected for amp functions.