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Pharo Networking by Example

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Noury Bouraqadi
Noury Bouraqadi

Invited Speaker at the first "Deep into Smalltalk" spring school. 7-11 march 2011. The pdf of this slides is also available onlie at: http://car.mines-douai.fr/noury/docs/deepIntoSmalltalk2011

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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
2 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
3 Software Software Nework Process Process Soc ke oc ket t S Bi-directional communication
4 Device A Device B Software Software Nework Process Process Soc ke oc ket t S
5 Device Z Software Software Nework Process Process Soc ke oc ket t S
6 2 Main Transport Protocols TCP UDP Transmission User Control Datagram Protocol Protocol
7 2 Main Transport Protocols TCP UDP •  Connected •  Connection free •  Reliable •  Unreliable •  Streams •  Limited size
8 Focus SSH POP TCP SMTP HTTP FTP
9 Connection Handling Process Server Client A Communication Process
10 Connection Handling Process Server Client A Communication Communication Process Process
11 Connection Handling Process Server Client B Communication Process Client A Communication Communication Process Process
12 Connection Handling Process Server Client B Communication Communication Process Process Client A Communication Communication Process Process
13 Connection Handling Process Client C Communication Process Server Client B Communication Communication Process Process Client A Communication Communication Process Process
14 Connection Handling Process Client C Communication Communication Process Process Server Client B Communication Communication Process Process Client A Communication Communication Process Process
15 Client Socket So cketS tream! 1.  Connect to a server 2.  Send a String 3.  Receive a String 4.  Close
16 Server for Tests Serve Unix! echo "Smalltalk" | nc –lk 12345 Multiple Port connections number
17 |stream| stream := SocketStream openConnectionToHostNamed: 'localhost' port: 12345. [ stream sendCommand: 'Pharo’. Transcript cr; show: (stream nextLineLf). ] ensure: [ stream close]
18 Simplest Possible Server 1.  Listen on some port 2.  Accept 1 single client connection 3.  Send a String 4.  Receive a String 5.  Close
19 Client for Tests Host Unix! echo "Smalltalk" | nc localhost 12345 Port number
20 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.]
21 Tw itter Luc: I’m struggling with the robots ---------- Noury: Which robots? WifiBots or Robulabs? ---------- like Luc: I need to setup the internal board of Robulab #2 ----------
22 Multi-threaded Server 1 process for connections 1 process for each client Sycnrhonization is needed
23 Multi-threaded fork Server 1 process for connections 1 process for each client Mutex Sycnrhonization is needed critical:
24 Socket 10110101 Socket 1 2 Network
25 Copying an object ! 10@34 10@34 110101 1011 Socket 10110101 Socket 1 2 Network
26 ReferenceStream streamed Represen tationOf: 1 0@34
27 Classes should be on both sides
28 Remote messaging Network
29 proxy dispatcher Socket Socket 1 10110101 2 Network
30 id3 id1 proxy dispatcher id1 Socket Socket 1 10110101 2 Network
31 Remote Transcript
32 Code Proxy Deployment Message (De-)Serializing passing control Messages Argument Garbage passing Collection? by reference
33 Proxy Message passing control doesNotUnderstand:
34 ReferenceStream unStream: aString (De-)Serializing Messages streamedRepresentationOf: anObject
35 What OCEAN Next? New Socket Library Distributed- Objects (rST)
a Clean, Portable Networking Library
Current network library ByteArray TCP+ IPv4 UDP+… +IPv6 Socket SocketAdress irty! HTTPSocket SocksSocket D 0% t ested
OCEAN Library Socket networkLibrary NetworkLibraryProxyFactory socketID WindowsLibrary MacOSLibrary TcpSocket UdpSocket LinuxLibrary OOP 100% tested NetworkingPlugin WrapperLibrary
OCEAN Library Lates t ers io n Socket v networkLibrary NetworkLibraryProxyFactory socketID WindowsLibrary MacOSLibrary TcpSocket UdpSocket LinuxLibrary 100% Pharo OOP 1.3 tested NetworkingPlugin WrapperLibrary
OCEAN for Pharo 1.3 ALL Primitives ! Image Socket Plugin Library Wrapper VM Socket Plugin OS Network API
OCEAN for Pharo 1.4? Posix Image Socket Library Library Wrapper VM Smalltalk FFI OOP IDE Plugin OS Posix Library
OCEAN + FFI + Posix 350 300 250 200 Ocean ms 150 OldSocket 100 50 0 Receive 10MB Send 10MB
Generalization Image Library Library Library A B Z VM FFI Smaller VM Other OS API α API β API ψ
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Pharo Networking by Example

  • 1. Networking by Example! Noury Bouraqadi http://car.mines-douai.fr/noury "Deep Into Smalltalk" Spring School 8 march 2011 - Lille, France
  • 2. 2 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
  • 3. 3 Software Software Nework Process Process Soc ke oc ket t S Bi-directional communication
  • 4. 4 Device A Device B Software Software Nework Process Process Soc ke oc ket t S
  • 5. 5 Device Z Software Software Nework Process Process Soc ke oc ket t S
  • 6. 6 2 Main Transport Protocols TCP UDP Transmission User Control Datagram Protocol Protocol
  • 7. 7 2 Main Transport Protocols TCP UDP •  Connected •  Connection free •  Reliable •  Unreliable •  Streams •  Limited size
  • 8. 8 Focus SSH POP TCP SMTP HTTP FTP
  • 9. 9 Connection Handling Process Server Client A Communication Process
  • 10. 10 Connection Handling Process Server Client A Communication Communication Process Process
  • 11. 11 Connection Handling Process Server Client B Communication Process Client A Communication Communication Process Process
  • 12. 12 Connection Handling Process Server Client B Communication Communication Process Process Client A Communication Communication Process Process
  • 13. 13 Connection Handling Process Client C Communication Process Server Client B Communication Communication Process Process Client A Communication Communication Process Process
  • 14. 14 Connection Handling Process Client C Communication Communication Process Process Server Client B Communication Communication Process Process Client A Communication Communication Process Process
  • 15. 15 Client Socket So cketS tream! 1.  Connect to a server 2.  Send a String 3.  Receive a String 4.  Close
  • 16. 16 Server for Tests Serve Unix! echo "Smalltalk" | nc –lk 12345 Multiple Port connections number
  • 17. 17 |stream| stream := SocketStream openConnectionToHostNamed: 'localhost' port: 12345. [ stream sendCommand: 'Pharo’. Transcript cr; show: (stream nextLineLf). ] ensure: [ stream close]
  • 18. 18 Simplest Possible Server 1.  Listen on some port 2.  Accept 1 single client connection 3.  Send a String 4.  Receive a String 5.  Close
  • 19. 19 Client for Tests Host Unix! echo "Smalltalk" | nc localhost 12345 Port number
  • 20. 20 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.]
  • 21. 21 Tw itter Luc: I’m struggling with the robots ---------- Noury: Which robots? WifiBots or Robulabs? ---------- like Luc: I need to setup the internal board of Robulab #2 ----------
  • 22. 22 Multi-threaded Server 1 process for connections 1 process for each client Sycnrhonization is needed
  • 23. 23 Multi-threaded fork Server 1 process for connections 1 process for each client Mutex Sycnrhonization is needed critical:
  • 24. 24 Socket 10110101 Socket 1 2 Network
  • 25. 25 Copying an object ! 10@34 10@34 110101 1011 Socket 10110101 Socket 1 2 Network
  • 26. 26 ReferenceStream streamed Represen tationOf: 1 0@34
  • 27. 27 Classes should be on both sides
  • 29. 29 proxy dispatcher Socket Socket 1 10110101 2 Network
  • 30. 30 id3 id1 proxy dispatcher id1 Socket Socket 1 10110101 2 Network
  • 32. 32 Code Proxy Deployment Message (De-)Serializing passing control Messages Argument Garbage passing Collection? by reference
  • 33. 33 Proxy Message passing control doesNotUnderstand:
  • 34. 34 ReferenceStream unStream: aString (De-)Serializing Messages streamedRepresentationOf: anObject
  • 35. 35 What OCEAN Next? New Socket Library Distributed- Objects (rST)
  • 37. Current network library ByteArray TCP+ IPv4 UDP+… +IPv6 Socket SocketAdress irty! HTTPSocket SocksSocket D 0% t ested
  • 38. OCEAN Library Socket networkLibrary NetworkLibraryProxyFactory socketID WindowsLibrary MacOSLibrary TcpSocket UdpSocket LinuxLibrary OOP 100% tested NetworkingPlugin WrapperLibrary
  • 39. OCEAN Library Lates t ers io n Socket v networkLibrary NetworkLibraryProxyFactory socketID WindowsLibrary MacOSLibrary TcpSocket UdpSocket LinuxLibrary 100% Pharo OOP 1.3 tested NetworkingPlugin WrapperLibrary
  • 40. OCEAN for Pharo 1.3 ALL Primitives ! Image Socket Plugin Library Wrapper VM Socket Plugin OS Network API
  • 41. OCEAN for Pharo 1.4? Posix Image Socket Library Library Wrapper VM Smalltalk FFI OOP IDE Plugin OS Posix Library
  • 42. OCEAN + FFI + Posix 350 300 250 200 Ocean ms 150 OldSocket 100 50 0 Receive 10MB Send 10MB
  • 43. Generalization Image Library Library Library A B Z VM FFI Smaller VM Other OS API α API β API ψ
  • 44. 44