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node.js and ql.io
Build Your Own HTTP APIs for Agility and Scale
OSCON July 20, 2012
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Subbu Allamaraju
@sallamar
github.com/s3u
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Jon LeBlanc
@jcleblanc
github.com/jcleblanc
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How to consume
HTTP APIs cheaply
and efficiently
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5
curl
-‐X
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Real code (randomized)
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Find things from A
For each thing, find details from B
For each thing, find more details from C
Merge results
Use case:
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Find products
Find dominant categories of products
Look up category info
Merge categories with products
Use case:
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Get stuff from A
If A is down, try from B
Annotate stuff with other stuff from C
Ignore some things from the stuff
Join all
Use case:
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Producers
Client
[Really important client]
Why don't you give me an
API optimized for my use
cases?
Server
[Really important producer]
Thanks. Get a number
and stand in the line!
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Producers
Client
Server
[Really important producer]
Thanks. Get a number
and stand in the line!
Who gets to
decide the right
thing?
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[Really important client]
Why don't you give me an
API optimized for my use
cases?
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Build Your Own Optimized APIs
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https://github.com/ql-io/ql.io
Platform Engineering
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A domain specific language for
HTTP client programming
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cut down lines of code
reduce no of requests
save bandwidth
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http://ql.io/console
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Server
Web Node.js
ql.io Installation Modes
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curl
http:///q?s=query
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As a Standalone Server
Node Host
ql.io
Data
(internal
)
Data
(externa
l)
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#
As
a
node.js
module
npm
install
ql.io-‐engine
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//
Use
ql.io
from
node.js
var
Engine
=
require('ql.io-‐engine');
var
engine
=
new
Engine({
//OPTIONS
});
var
script
=
'…';
engine.execute(script,
function(emitter){
emitter.on("end",
function(err,
res){
…
});
});
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Language:
Defining
a
Data
Source
Include
in
.ql
file
Include
in
Request
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Example:
Mustache
Templates
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Example:
jQuery
for
Cross
Domain
Reqs
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Let’s Do It!
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1. Interop via HTTP
2. SQL inspired
3. Implicit orchestration
4. Failure modes
5. Consumer oriented
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code
https://github.com/ql-io/ql.io
docs/demos
http://ql.io
https://github.com/jcleblanc/api-masher
blog
http://ql-io.github.com