Networking by Example Noury Bouraqadi - - PowerPoint PPT Presentation

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Networking by Example Noury Bouraqadi - - PowerPoint PPT Presentation

Jul 31, 2023 272 likes •717 views

Networking by Example Noury Bouraqadi http://car.mines-douai.fr/noury "Deep Into Smalltalk" Spring School 8 march 2011 - Lille, France 2 Agenda Networking Basics Sockets and protocols Client vs. Server Hands-on

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Networking by Example

Noury Bouraqadi http://car.mines-douai.fr/noury

"Deep Into Smalltalk" Spring School 8 march 2011 - Lille, France

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Agenda

  • Networking Basics

– Sockets and protocols – Client vs. Server – Hands-on with SocketStream

  • Serving

– Connection vs. communication – Hands-on Concurrency

  • Complex interactions

– Exchanging objects over a network – Remote messaging Hands-on

2

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3

Socket Nework Software Process Software Process Socket

Bi-directional communication

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Socket Nework Software Process Software Process Socket

Device A Device B

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Socket Nework Software Process Software Process Socket

Device Z

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2 Main Transport Protocols TCP UDP

Transmission Control Protocol User Datagram Protocol

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7

TCP UDP

  • Connected
  • Reliable
  • Streams
  • Connection free
  • Unreliable
  • Limited size

2 Main Transport Protocols

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8

TCP

HTTP Focus FTP SMTP POP SSH

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Server

Connection Handling Process

Client A

Communication Process

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Server

Connection Handling Process

Client A

Communication Process Communication Process

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Server

Connection Handling Process

Client A

Communication Process Communication Process

Client B

Communication Process

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12

Server

Connection Handling Process Communication Process

Client A

Communication Process Communication Process

Client B

Communication Process

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Server

Connection Handling Process Communication Process

Client A

Communication Process Communication Process

Client B

Communication Process

Client C

Communication Process

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Server

Connection Handling Process Communication Process Communication Process

Client A

Communication Process Communication Process

Client B

Communication Process

Client C

Communication Process

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Clien ent Socket

1.

  • 1. Co

Connect t to a se

  • a server

2.

  • 2. Sen

end a S a Str tring 3.

  • 3. Recei

eive a S a Str tring 4.

  • 4. Close

S

  • c

k e t S t r e a m S

  • c

k e t S t r e a m

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Server for Tests

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ec echo " "Sma malltalk" " | nc nc – –lk lk 1 1234 2345

Po Port numb mber Multiple co connections Unix Unix Serve

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|stream| stream := SocketStream

  • penConnectionToHostNamed: 'localhost'

port: 12345. [ stream sendCommand: 'Pharo’. Transcript cr; show: (stream nextLineLf). ] ensure: [ stream close]

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Simp mplest Possible e Server

1.

  • 1. Listen

en o

  • n

n so some p port rt 2.

  • 2. Ac

Accept 1 si 1 singl gle clien ent co connection 3.

  • 3. Sen

end a S a Str tring 4.

  • 4. Recei

eive a S a Str tring 5.

  • 5. Close
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Client for Tests

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ec echo " "Sma malltalk" " | nc nc lo localhost 1 1234 2345

Po Port numb mber Unix Unix Ho Host

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connectionSock := Socket newTCP. [ connectionSock listenOn: 12345 backlogSize: 10. interactSock := connectionSock waitForAcceptFor: 30. stream := SocketStream on: interactSock. stream sendCommand: 'Pharo Server!’. Transcript cr; show: stream nextLineLf. ] ensure: [ connectionSock closeAndDestroy. stream close.]

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Luc: I’m struggling with the robots

  • Noury: Which robots? WifiBots or

Robulabs?

  • Luc: I need to setup the internal board of

Robulab #2

  • Tw

Twit itter li like

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Multi-threa eaded Se Server 1 1 pr proce cess fo for co connections 1 1 pr proce cess fo for ea each clien ent Sy Sycnrho honiza izatio ion is is nee eeded

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Multi-threa eaded Se Server 1 1 pr proce cess fo for co connections 1 1 pr proce cess fo for ea each clien ent Sy Sycnrho honiza izatio ion is is nee eeded

fo fork Mu Mutex cr critical:

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So Socket 1 So Socket 2

10110101 10110101

Network

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Copying an object !

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So Socket 1 So Socket 2

10110101 10110101

Network 1011 1011

10@ 10@34 34 10@ 10@34 34

110101 110101

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Referen enceS eStrea eam

s t r e a m e d R e p r e s e n t a t i

  • n

O f : 1 @ 3 4

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Cl Classe sses s sho should ld be be

  • n
  • n bo

both th si side des

27

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Remote messaging

28

Network

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pr proxy

So Socket 1 So Socket 2

10110101 10110101

dispa dispatche her

Network

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pr proxy id id1

So Socket 1 So Socket 2

10110101 10110101

dispa dispatche her id id1

Network

id id3

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Remo emote Tr Transcript

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Pr Prox

  • xy

Message pa passi ssing c g contr trol

  • l

(De- e-)Serializing Me Messa ssages Ga Garbage Co Collectio ion? Argumen ent pa passi ssing g by by referen ence Code Deploymen ent

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Pr Prox

  • xy

Message pa passi ssing c g contr trol

  • l

do doesN sNotUnde derstan and:

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(De- e-)Serializing Me Messa ssages Referen enceS eStrea eam strea eamedRepresen entationOf Of: : anOb Object unStrea eam: : aSt aStrin ing

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Di Distr tributed- Ob Objects (rST rST)

OC OCEA EAN

New ew Socket Li Libr brary

What Next?

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a Clean, Portable Networking Library

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Socket HTTPSocket SocksSocket SocketAdress ByteArray TCP+ UDP+… IPv4 +IPv6 IPv4 +IPv6

Current network library

0% tested

Dirty!

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TcpSocket UdpSocket NetworkLibraryProxyFactory WindowsLibrary LinuxLibrary Socket

networkLibrary socketID

MacOSLibrary NetworkingPlugin WrapperLibrary

OCEAN Library

OOP

1 % t e s t e d

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TcpSocket UdpSocket NetworkLibraryProxyFactory WindowsLibrary LinuxLibrary Socket

networkLibrary socketID

MacOSLibrary NetworkingPlugin WrapperLibrary

OCEAN Library

P h a r

  • 1

. 3

Latest version

OOP

1 % t e s t e d

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VM Image OS

Plugin Wrapper Network API

OCEAN for Pharo 1.3

Socket Plugin Socket Library

ALL Primitives !

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VM Image OS

Posix Library Wrapper Posix Library

OCEAN for Pharo 1.4?

FFI Plugin Socket Library

OOP Smalltalk IDE

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OCEAN + FFI + Posix

50 100 150 200 250 300 350 Receive 10MB Send 10MB ms Ocean OldSocket

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VM Image Other OS

Library A Library B Library Z API α API β API ψ

Generalization

FFI

Smaller VM

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