Build your own webserver with PHP

Transcript

1. Build your own
   web server with

2. @igorwesome

3. Event-driven, non-blocking I/O with PHP.

4. None

5. When you open your web browser… ! What actually happens?

6. None

7. http://igor.io/

8. DNS Where is igor.io?

9. DNS 176.58.127.253

10. 176.58.127.253

11. 2^16! 65535! TCP ports

12. TCP port 80

13. SYN

14. SYN/ACK

15. ACK

16. None

17. GET / HTTP/1.1! Host: igor.io

18. HTTP/1.1 200 OK! Content-Type: text/html! ! …

19. HTTP TCP IP

20. Layers +---+--------------+----------------+ | 7 | Application | HTTP, FTP, DNS

    | | 6 | Presentation | TLS | | 5 | Session | TCP | | 4 | Transport | TCP, UDP | | 3 | Network | IP | | 2 | Data Link | ARP, PPP | | 1 | Physical | | +---+--------------+----------------+

21. http://igor.io/

22. http://igor.io:80/

23. http://igor.io:80/ } DNS (layer 7)! resolves to! IP (layer 3)

24. http://igor.io:80/ } TCP (layer 4)

25. http://igor.io:80/ } TLS (layer 6)! HTTP (layer 7) } HTTP

    (layer 7)

26. The Socket API

27. ________ < socket > -------- \ ^__^ \ (oo)\_______ (__)\

    )\/\ ||----w | || ||

28. #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> socket() -------- bind() listen()

    accept() -------- connect()

29. Syscalls Process socket! bind! listen! accept! connect! ! read! write!

    close! !

30. Stream Sockets

31. I will show you Les Codes 00

32. HTTP: The Protocol

33. Request GET / HTTP/1.1 <--- request line Host: igor.io <---

    header <--- line feed <--- body (blank)

34. Response HTTP/1.1 200 OK <--- status line Content-Length: 2 <---

    headers <--- line feed Hi <--- body

35. Verbs •GET •POST

36. Verbs •GET •POST •PUT •DELETE

37. Verbs •GET •POST •PUT •DELETE ! •HEAD •OPTIONS •TRACE •CONNECT

38. • 1xx - Special protocol stuff • 2xx - All

    good • 3xx - Redirection • 4xx - You messed up • 5xx - I messed up Status codes

39. Keep-Alive

40. Streaming • Transfer-Encoding: chunked • dechex(strlen($chunk)) \r\n $chunk \r\n •

    0 \r\n \r\n

41. General weirdness • Trailers • Repeated headers • 100 Continue

42. ABNF is
    very permissive

43. HTTP/1.1
    RFC 2616 read it.

44. Parsing

45. Request GET / HTTP/1.1 <--- request line Host: igor.io <---

    header <--- line feed <--- body (blank)

46. More codes 01, 02

47. Problem? • Incomplete HTTP parser • Missing error handling •

    Assumption: request can be read in one go • Assumption: request no larger than 512 bytes • Assumption: request/response body fits in memory • Blocking I/O

48. Non-blocking I/O

49. Even more codes 03-08

50. Unreadable

51. LOL error handling

52. Writing your own HTTP server is hard

53. Don’t do it.

54. None

55. Questions? joind.in/9277 ! reactphp.org ! @igorwesome ! ! github.com/igorw/webserver-zceu

56. Bonus • Memory leaks • Too fast reads / too

    slow writes • libevent / libev / libuv • Promises • Generators • pthreads • WebSockets

57. Logo credits • Netscape • Apache • FreeBSD • Erlang