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 Functions?
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 paulWalker(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,
paulWalker,
queryLegacyAPI
)(query);
}
Accomplishments
- Brought down drug lords (multiple times)
- Apprehend rouge secret agents (twice)
- Prevent nuclear war
Plot Points
- Car Thefts
- Blackmail
- Jailbreaks
- Kidnappings
- Murders!
Events
- Git commit
- Database action
- Cron job
- Blob storage
- Analytics trigger
- etc, etc, etc
What about Serverless?
On Premises
IaaS
PaaS
SaaS
Faas
It's about the Cars…
…and the Roads.
Furious…
- Characters
- Cars
- Roads
 - Infinite possiblities
Serverless
- Code (Faas)
- Containers (SaaS/PaaS)
- Other folks Infrastructure (IaaS)
- Unbounded Scaling
Why?
🤔
Translation
Query
Static Assets
Translation
Query
Static Assets
Translation
Query
Static Assets
FaaS
Translation
Query
Static Assets
FaaS
đź’°
No more hosting fees!
Thanks Linda Nichols (@lynnaloo)!
Check out her great talk on Serverless called
Summary
- Functions should only do one thing
- Everything a function needs should be passed in as input
- The same input should produce the same output every time
- Compose multiple small functions to make more complicated actions
- Use events to fire off sequences of functions
- Take advantage of other people's infrastructure so you can focus on the code
The FaaS and the Serverless
By Simon MacDonald
The FaaS and the Serverless
jsMobileConf Boston
- 3,800