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[GCPUG India] Firebase - Build Extraordinary Apps
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Kazunori Sato
July 04, 2015
Programming
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[GCPUG India] Firebase - Build Extraordinary Apps
Kazunori Sato
July 04, 2015
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Transcript
Firebase: Build Extraordinary Apps
+Kazunori Sato @kazunori_279 Kaz Sato Developer Advocate, Cloud Platform, Google
Inc. Cloud community advocacy Cloud product launch support
Mobile App for Millions of People Authentication. Storing Data. Interactions.
“Make it work in the Cloud”
In the Cloud, you need… Front End. Business Logic. Database.
Multiple Servers, Load Balancers, Replicas, Backups...
For Clients, you need to support… Smart Phones. Tablets. Desktops.
Android, iOS and Browsers
Talking to a Backend Large Scale M-to-N Connections with Realtime
messaging … It’s not easy
= Expensive Engineering Time
Is there a better way?
Firebase is a powerful platform for mobile and web applications.
Firebase User Authentication Realtime Database Static Hosting
Firebase User Authentication Realtime Database Static Hosting
Firebase User Authentication Realtime Database Static Hosting
Location Collaboration Gaming Realtime is…
Location Collaboration Gaming Realtime is…
Location Collaboration Gaming Realtime is…
Unreliable networks Multi Platform Realtime is hard! Complex Transport Stateful
2-way connection How to implement it?
Unreliable networks Multi Platform Realtime is hard! Complex Transport 4G/WiFi
switching. Subways. Tunnels. Basements.
Unreliable networks Multi Platform Realtime is hard! Complex Transport Different
Capabilities, Behaviors and Languages
Firebase in the Real World
CBS 50,000 Concurrent Users 27,000,000 chat messages
$40,000 Kickstarter 100,000 Users
200,000+ Developers
How to Develop?
Demo: mmoasteroids
Firebase Dashboard Database. Security. Analytics. Debugging. Deployment.
Setup // Firebase connection Stuff var firebaseRef = new Firebase("https://mmoasteroids.firebaseio.com");
var firebaseRefGame = firebaseRef.child('game');
Start up the user’s ship // Add player's ship to
Firebase var myship = firebaseRefGame.child('players').push(); // Schedule player removal on disconnect at the backend myship.onDisconnect().remove();
// Write new ship location to Firebase on any update
myship.set({ ship: { acc: this.acc, vel: this.vel, x: this.x, y: this.y, rot: this.rot, accb: KEY_STATUS.up }, user: currentUser }); Write our ship to firebase on updates
// Sync new enemy ships from Firebase to local game
state firebaseRefGame.child('players').on('child_added', function (snapshot) { if (snapshot.key() !== myship.key()) { var enemy = new EnemyShip(); enemy.acc = snapshot.val().ship.acc; enemy.vel = snapshot.val().ship.vel; enemy.x = snapshot.val().ship.x; enemy.y = snapshot.val().ship.y; enemy.rot = snapshot.val().ship.rot; enemy.accb = snapshot.val().ship.accb; enemy.user = snapshot.val().user; enemy.visible = true; enemy.fref = firebaseRefGame.child('players').child(snapshot.key()); }}); We read enemy ships too...
firebaseRefGame.child('players').on('child_removed', function (snapshot) { if (snapshot.key() !== myship.key()) { var
enemy = Game.sprites[snapshot.key()]; enemy.visible = false; delete Game.sprites[snapshot.key()]; Game.explosionAt(snapshot.val().ship.x, snapshot.val().ship.y); } else { Game.ship.collision(null); } }) We handle enemy ship “removal”
bullet.fref = firebaseRefGame.child('bullets').push({ s: myship.key(), x: bullet.x, y: bullet.y, vel:
bullet.vel }); bullet.fref.onDisconnect().remove(); Bullets
// Sync enemy bullets from Firebase to local game state
firebaseRefGame.child('bullets').on('child_added', function (snapshot) { var bullet = snapshot.val(); if (bullet.s !== myship.key()) { var enemybullet = new EnemyBullet(); enemybullet.x = bullet.x; enemybullet.y = bullet.y; enemybullet.vel = bullet.vel; enemybullet.visible = true; enemybullet.fref = firebaseRefGame.child('bullets').child(snapshot.key()); Game.sprites['bullet:' + snapshot.key()] = enemybullet; }}); Enemy bullets
firebaseRefGame.child('bullets').on('child_removed', function (snapshot) { var bullet = snapshot.val(); if (bullet.s
!== myship.key()) { var enemybullet = Game.sprites['bullet:' + snapshot.key()]; if (enemybullet != null) { enemybullet.visible = false; } delete Game.sprites['bullet:' + snapshot.key()]; } }); Enemy bullet removal
Conclusions
Mobile Is Important!
Traditionally Complex!
None
None
https://firebase.com
Thank you! This work is licensed under a Creative Commons
Attribution 2.0 Generic License.