Internet OfThings
Bologna 2015, June 17
Taking pictures!!For Internet Of Things!
Raspbery PiAbout 30$
Big as a credit card
A powerful ARM!
GNU/Linux on board
More...
The Camera moduleAbout 30$
around 25 x 20 x 9 mm
5 Megapixels
Supports 1080p30, 720p60, VGA90 video
More...
Grab picturesEnable the camera module via raspi-config
Just use it: raspistill -o me.jpg
Hey @CorleyCloud here is your picture: pic.2015.cloudconf.it/CorleyCloud/61… pic.twitter.com/LW8jUSPIa73:33 PM 16 Jun 2015
16 JunCorley @CorleyCloud#cloudconf2015 #pic
CloudConf @_CloudConf_
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Read for tweets and reply back with pictures!
The tweet processRaspberry read a twitter stream for #cloudconf2015 #picRaspberry upload the original picture to AWS S3AWS Lambda resize the image and optimize it for the webAWS Lambda tweet the picture to the final user
On Raspberry Pi
GolangPowerfulavailable for multiple platforms (x86, ARM, ...)self-contained binariesMuch more!
Read the Twitter Streamimport ( tw "github.com/wdalmut/twitterstream/async")
client := tw.NewClient( config.ConsumerKey, config.ConsumerSecret, config.AccessToken, config.AccessSecret,)
client.TrackAndServe("cloudconf2015", func(tweet *twitterstream.Tweet) { // Here the logic!})
github.com/wdalmut/twitterstream/asyncgithub.com/darkhelmet/twitterstream
Grab pictures using commands! (easy)cmd := exec.Command( "raspistill", // Command name "a", "www.cloudconf.it #cloudconf2015", //Watermarks "t", "500", "vf", "hf", //Rotate "w", "1024", "h", "768", //1024x768 "quality", "60", //60% "o", "/tmp/pic.jpg") // Put in /tmp foldererr := cmd.Run()
You can also take pictures using OS Signals
Upload on AWS S3// Upload it!err = bucket.Put(path, bytes, "image/jpg", s3.ACL("publicread"), s3.Options{})
Prepare the AWS clientAWSAuth := aws.Auth{ AccessKey: config.Key, SecretKey: config.Secret,}
region := aws.EUWest
connection := s3.New(AWSAuth, region)bucket := connection.Bucket(BUCKET)
https://github.com/wdalmut/raspi-twitter-cloudconf
Cross-Compiling (install GO for ARM)
Prepare your environment
$ cd $GOROOT/src$ GOOS=linux GOARCH=arm ./make.bash noclean
Compile your source code
$ GOARM=6 GOARCH=arm GOOS=linux go build
Use a Makefiledefault: all
all: test GOARM=6 GOARCH=arm GOOS=linux go build a ssh pi@$(TARGET) 'killall picme | true' scp start.sh pi@$(TARGET):~ scp picme pi@$(TARGET):~ scp config.json pi@$(TARGET):~ ssh pi@$(TARGET) './picme < /dev/null >/tmp/picme.log 2>&1 &'
test: go test v ./...
Compile it locally, copy it into the Raspi and run it on board!
TARGET=192.168.1.53 make
Lambda receive the S3 upload event
... now we have to tweet the picture
AWS Lambda works with Javascript
But
I prefer Coffeescript
Coffeescript and Lambda
/* Prepare the "twitter" client ... */
exports.handler = (event, context) > /** < EVENT and the CONTEXT **/
twitter.tweetAbout(event).then( () > context.done null, "" (err) > context.done err, "Unable to tweet!" )
Just code with your event!
S3 upload event!{ "Records": [ { "s3": { "bucket": { "name": "sourcebucket", "ownerIdentity": { "principalId": "XXXXXXXXXXXXXXXXX" }, "arn": "arn:aws:s3:::example.walterdalmut.com" }, "object": { "key": "walterdalmut/1924762.jpg", "size": 1024, "eTag": "11111111111111111111111111111111" } } } ]}
Please consider that this is not a real S3 event (just a part of it...)
Test your Lambdashandler = require '../src/lambda'
describe "Lambda callback", > beforeEach > @context = {} @context.done = () >
@event = { "Records": [ { /* ... */ } ] }
it "should expose the lambda handler", > spyOn(handler, "handler").and.returnValue null
handler.handler(@event, @context)
expect(handler.handler).toHaveBeenCalled()
A look into the Lambda functionhttps://github.com/wdalmut/lambda-twitter-cloudconf
Deploy on AWS LambdaSimple prepare a ZIP artifact grunt dist
tweet it! #cloudconf2015 #pic
Thanks for listening
