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