Talk about device synchronization with Javascript and PouchDB. Real life examples with Cozy.io use cases (file sync). Performed @ Human Talk Paris (décembe 2014).

1. Vos appareils méritent plus que vos fichiers

3. v

11. Setup
$ npm install pouchdb ­­save
var pouchdb = require('pouchdb');
<script src="pouchdb.min.js"></script>

12. Synchronization
var db = new PouchDB('todos');
var remoteCouch = 'https://mycouch/todos';
var opts = {live: true};
db.sync(remoteCouch, opts)
.on('change', onChange)
.on('uptodate', onUpdate)
.on('error', onError);

13. Conflicts
var opts = {conflicts: true};
db.get('docid', opts, function (err, doc) {
var rev = doc._rev;
var conflictRev = doc._conflicts[0];
rev = selectRevision(rev, conflictRev);
opts = {rev: rev};
db.get('docid', opts, function (err, doc) {
db.put(doc);
});
};

14. Messaging (pub/sub)
function onChange (change) {
if(change.doc.type === 'message'
&& change.doc.chan === 'mychan') {
console.log(doc.content);
db.put({
type: 'message',
chan: 'mychan'
content: 'Got it! Now I publish'
});
}

15. cozy-labs/cozy-mobile
Cozy Mobile
# Add WebSQL plugin
$ cordova plugin add https://github.com/brodysoft/Cordova­SQLitePlugin
# Cordova app
var db = new PouchDB('cozy', {adapter: 'websql'});
db.replicate.from({https://mycozy/cozy, {
batch_size: 5,
batches_limit: 1,
filter: function (doc) {
return doc.docType === 'Folder' || doc.docType === 'File';
},
live: true
since: checkpoint
});

16. cozy-labs/cozy-desktop
Cozy Desktop
# NodeWebkit app
var replicator = require('./backend/replication');
replicator.runReplication …
# Node.js Backend (replication.js)
var db = new Pouch('~/.cozy­desktop/db');
db.replicate.from({
https://mycozy/cozy,
filter: function (doc) {
return doc.docType === 'Folder' || doc.docType === 'File';
},
since: checkpoint
})
db.replicate.to(…) ;

17. cozy-labs/cozy-light
Cozy Light
$ npm install cozy­light ­g
$ cozy­light install cozy­labs/cozy­light­pouchdb­api
$ cozy­light install cozy­labs/cozy­light­html5­apps
$ cozy­light install mygithub/mypouchapp1
$ cozy­light install mygithub/mypouchapp2
$ cozy­light start
Cozy Light is listening on port 19104…
# In your app…
PouchDB.replicate('http://' + window.location.host + '/db/cozy', 'db')

18. pouchdb/pouchdb
pouchdb/pouchdb-server
colinskow/pouch-mirror
natevw/PeerPouch
nolanlawson/pouchdb-quick-search
pouchdb.com