FaaS

THE

S

erverless

AND THE

Simon MacDonald
@macdonst

How I saved myself some 💰 by converting from

to

What do the Fast & the Furious movies have to do with Serverless?

Planning

Punching

Mechanic

Comic Relief

Characters

Functions

Fetch

Process

Transform

UI

Characters

Have their own agency
Internally consistent
Do one thing well

Functions

Stateless
Pure
One task per function

How does this relate to FaaS?

The Paul Walker Pattern(s)

Chaining

Fan in/out

Accomplishments

Brought down drug lords (multiple times)
Apprehend rouge secret agents (twice)
Prevent nuclear war

function queryLegacyAPI(query) {
    return fetch(api.getData(query))
        .then(response => response.text())
        .then(xmlString => parseXML(xmlString))
        .then(xml => { return xml; })
    );
}

function formatResponse(data) {
    const template = await loadTemplate();
    const html = json2html.transform(data, t);
    return html;
}

function transform2Json(data) {
    const xslt = await loadXslt();
    const parser = new DOMParser();
    const doc = parser.parseFromString(data, "application/xml");
    const json = doc.transformNode(xslt)
    return json;
}

Composing Functions

function queryLegacyAndFormat() {
    return compose(
            formatResponse,
            transform2Json,
            queryLegacyAPI
    )(query);
}