dconf21014 - mobile gameserver backend in d - stephan dilly

Mobile Gameserver Backend in D

Stephan Dilly

@Extrawurst

5/23/2014

Stephan Dilly (@Extrawurst) #dconf2014 5/23/2014 1 / 28

Structure

1 The Author

2 STACK4

3 STACK4 Multiplayer

4 D at Funatics

5 Conclusion


The AuthorPersonal

Stephan Dilly

28 years old

Programming for 15 years

Game Industry for 7 years

Software Engineer at Funatics Software GmbH


The AuthorTrack Record

2007 The Settlers - Rise of Cultures (PC)

2008 Tom Clancy’s Endwar (NDS/PSP)

2009 24-Fun

2010 Cultures Online

2011 Ufo Online

2012 Panzer General Online


The AuthorD experience


The AuthorD experience

2006 First encounter with D

2007 First dmd bug report ;)

2008 Thesis about game development in D

2009 Multiple hobby projects

2013 STACK4 Server Backend

2014 FunNetX Server Backend Components


STACK4The Game


STACK4History

05/22/2013 Repo created

06/17/2013 First Release on Android

07/30/2013 Release on Blackberry10

12/18/2013 Added Online Multiplayer

05/13/2014 Release on iOS


STACK4 MultiplayerStructure

Requirements

Research

Vibe.d

Architecture

Implementation


STACK4 MultiplayerRequirements

Supports long polling (sockjs)

Fast and memory efficient

Compatible with our consumer server

Easy upscaling

Fast development process


STACK4 MultiplayerNodejs

Simple event driven io

great community (npm)

javascript, typescript

callback hell


STACK4 MultiplayerJava

statically typed

proven, huge knowledge base/community

vertx.io for evented io

big memory footprint in our case


STACK4 MultiplayerVibe.d - Introduction

Vladimir’s Talk at dconf2013

”Asynchronous I/O for maximum speed and minimum memory usage”

”Fiber based”

Simple RESTful services


STACK4 MultiplayerVibe.d - Comparison

1 va r h t tp = r e q u i r e ( ” h t tp ” ) ;2 va r f s = r e q u i r e ( ” f s ” ) ;3

4 ht tp . c r e a t e S e r v e r ( f u n c t i o n ( req , r e s ) {5 r e s . wr i t eHead (200 , { ’ content−t ype ’ : ’ t e x t / p l a i n ’ }) ;6

7 setTimeout ( f u n c t i o n ( ) {8 f s . a ppendF i l e ( ’ l o g . t x t ’ , ’ dat to append ’ , f u n c t i o n ( e r r ) {9 i f ( e r r ) throw e r r ;

10

11 r e s . end ( ”World ! ” ) ;12 }) ;13 } , 1000) ;14 }) . l i s t e n (80) ;

Listing 1: node example


STACK4 MultiplayerVibe.d - Comparison

1 impor t v i b e . d ;2

3 vo i d hand l eReques t (4 HTTPServerRequest req ,5 HTTPServerResponse r e s ) {6

7 s l e e p ( 1 . s econds ) ;8

9 appendToFi l e ( ” l o g . t x t ” , ” dat to append” ) ;10

11 r e s . wr i t eBody ( ” He l l o World ! ” ) ;12 }13

14 sha r ed s t a t i c t h i s ( ) {15 l i stenHTTP (new HTTPServerSett ings , &hand l eReques t ) ;16 }

Listing 2: vibe.d example


STACK4 MultiplayerBackend architecture

LoadbalancerSmartphone Firewall

UserDB (MySQL)

User


STACK4 MultiplayerLibraries

forever-d

sockjs-d

sockjs-unity3d-xhr

elo-rating-d

xtea-d

gcm-d/apn-d

find the libraries on github under https://github.com/Extrawurst/...


STACK4 Multiplayersyslogclient.log template

1 // b e f o r e2 l o g g e r . l o g ! ” event2 ” ( [3 ”param2” : to ! s t r i n g (12) ,4 ”param3” : to ! s t r i n g ( t r u e ) ] ) ;5

6 // a f t e r7 l o g g e r . l o g ! ” event2 ” (8 ”param2” , 42 ,9 ”param3” , t r u e ) ;

Listing 3: example


STACK4 Multiplayersyslogclient.log template

1 vo i d l o g ( s t r i n g event , T . . . ) ( i n T params ) {2

3 s t a t i c a s s e r t (T. l e n g t h % 2 == 0 , ”odd number o fpa ramete r s r e q u i r e d ” ) ;

4

5 i f ( m ur l . l e n g t h == 0)6 r e t u r n ;7

8 s t r i n g [T. l e n g t h ] paramArray ;9

10 f o r e a c h ( i , param ; params ) {11

12 paramArray [ i ] = to ! s t r i n g ( param ) ;13 }14

15 // s n i p : a c t u a l l o g g i n g . . .16 }

Listing 4: implementation


STACK4 Multiplayersyslogservice.equalComponents

1 // b e f o r e2 i f ( cu r r entT ime . y ea r != m lastFi leNameUpdateTime . y ea r | |3 cur r entT ime . month != m lastFi leNameUpdateTime . month | |4 cur r entT ime . day != m lastFi leNameUpdateTime . day | |5 cur r entT ime . hour != m lastFi leNameUpdateTime . hour )6 {}7

8 // a f t e r9 i f ( ! equalComponents ! ( SysTime , ” yea r ” , ”month” , ”day” , ” hour ” ) (

cur rentTime , m lastF i leNameUpdateTime ) )10 {}

Listing 5: example


STACK4 Multiplayersyslogservice.equalComponents

1 boo l equalComponents (T,COMPONENTS . . . ) (T a , T b ) {2

3 f o r e a c h ( comp ; COMPONENTS) {4

5 s t a t i c a s s e r t ( i s ( t y p e o f ( comp) : s t r i n g ) ,6 ” components must be s t r i n g ” ) ;7

8 s t a t i c a s s e r t ( t r a i t s ( comp i l e s , m ix in ( ” a . ”˜comp) ) ,9 ” ’ ”˜comp˜” ’ i s not a member o f ’ ”˜T. s t r i n g o f ˜” ’ ” ) ;

10

11 mix in ( ” i f ( a . ”˜comp˜”!= b . ”˜comp˜” ) r e t u r n f a l s e ; ” ) ;12 }13

14 r e t u r n t r u e ;15 }

Listing 6: implementation


STACK4 MultiplayerMsgType send/parse enhancement

1 // b e f o r e2 i f ( a r g s . l e n g t h == 3) {3 i n t paramJoin , gametypes ;4

5 i f ( t r yPa r s e ! i n t ( a r g s [ 1 ] , paramJoin ) &&6 t r yPa r s e ! i n t ( a r g s [ 2 ] , gametypes ) )7 { . . . }8 }9

10 // a f t e r11 t r y {12 auto r e s = parseMsg !MsgMatchMake ( a r g s [ 1 . . $ ] ) ;13 . . .14 }15 ca tch ( MsgParseExcept ion e ) { . . . }

Listing 7: example


D at FunaticsD components

webapi

loginapi

clientconfigapi

syslogservice


ConclusionWhat rocks

Performance

Build speed

Syntax,Templates

Mono-D

Vibe.d and DUB

we had an itch - so we scratched it


ConclusionWhat rocks not so much

GC in Phobos

Exceptions in vibe.d

GUI

Debugging on windows


ConclusionFuture directions

D in STACK4

D at Funatics

D Games using Amazon AppStream (maybe using aurora?)


Thank you for your attention!


dconf21014 - mobile gameserver backend in d - stephan dilly

Software

f e r r

i s t e n

httpserverresponse r

r e q u i r e f s

t e x t p

r e q u i r e h t tp

t i c t h i s

f u n c t i o n e r