![Write an Extension
● --enable-debug --enable-maintainer-zts
● ext_skel
$ vi ext/$extname/config.m4
$ ./buildconf
$ ./configure –[with|enable]-$extname
$ make
$ ./php -f ext/$extname/$extname.php
$ vi ext/$extname/$extname.c
$ make](https://image.slidesharecdn.com/phpconftw2012php-as-a-middleware-in-embedded-systems-121113033951-phpapp02/85/phpconftw2012-PHP-as-a-Middleware-in-Embedded-Systems-85-320.jpg)
(phpconftw2012) PHP as a Middleware in Embedded Systems
- 1. PHP as a Middleware in Embedded Systems @phpconftw2012
- 5. 故事開始
- 6. 2012 年 , 連網電視正夯
- 8. 該如何開始？
- 9. 先來測個 API 吧
- 10. ● Request the developer account to 3rd party ● Get the technical document ● Build the test environment ● Download sample code ● Test all APIs with JAVA ● … OK
- 11. 杯具發生了 ...
- 12. 板子上沒有 JVM
- 13. 歡迎來到嵌入式系統的世界
- 14. Embedded System An embedded system is a computer system designed for specific control functions within a larger system, often with real-time computing constraints.
- 15. ● No APT, no YUM ● Hardware limitation ● ! Scale ● Deploy/update not easy
- 16. Back to the basics
- 18. Display System Application GUI-ToolKit Framebuffer Hardware
- 19. In Embedded System /dev/fb driver SoC
- 21. Q2: 是否可以讓 UI 只做 UI ？
- 23. Middleware Application Turnkey/Driver Hardware
- 24. Middleware Application Turnkey/Driver Hardware
- 25. Middleware Application interface interface Turnkey/Driver Hardware
- 26. Middleware Application interface Portable Layer interface Turnkey/Driver Hardware
- 27. Q3: rd 要能實做 3 Party App 的基本需求？
- 28. ● RESTFul API ● JSON/XML data format ● Symmetric/asymmetric encryption ● SSL communication ● Data storage ● Multi-byte encoding
- 29. PHP as Software Glue in Embedded Systems
- 30. Why PHP
- 31. ● Tiny, low resource usage ● Community contribution (PEAR/PECL) ● 3rd party API (Youtube/Twitter/Facebook...) ● Integration with lots of libraries
- 32. ● RESTFul API /cURL ● JSON/XML data format /LibeXpat, Libxml2 ● Symmetric/asymmetric encryption /Libmcrypt ● SSL communication /OpenSSL ● Data storage /SQLite3 ● Multi-byte encoding /Libiconv ● Inter-Process Communication /Socket, SHM ● Core /PHP-CLI
- 33. PHP as a Middleware Application Turnkey/Driver Hardware
- 34. Tasks ● Architecture design ● Porting libraries ● Development & debug ● Performance tunning
- 36. Web Server + PHP ？
- 37. ● Apache MPM prefork + mod_php ● Nginx + FastCGI ● Lighttpd + PHP-FPM ● Boa + PHP-CGI
- 38. 杯具又發生了 ...
- 39. ● 資源吃很兇 ● 不容易移植 ● 記憶體洩漏 ● 常常連不上
- 40. 砍掉重練
- 42. PHP invoke data exchange Native Code
- 43. ● Shared library PHP invoke data exchange Native Code
- 44. ● Shared library ● Embedded build (--enable-embed) PHP invoke data exchange Native Code
- 45. ● Shared library ● Embedded build (--enable-embed) ● Shell command PHP invoke data exchange Native Code
- 46. ● Shared library ● Embedded build (--enable-embed) ● Shell command ● Socket PHP invoke data exchange Native Code
- 47. Socket Server
- 48. Design ● Concurrent server (No multi-thread in PHP) ● IPC mechanism (broadcast/multicast/unicast) ● Client/Server command protocol ● No framework, all things handmade
- 49. PHP Work Flow
- 51. application interface socket server storage Turnkey/Driver Hardware
- 52. application interface socket server storage Turnkey/Driver Hardware
- 53. application interface socket server storage Turnkey/Driver Hardware
- 54. You Tube application interface socket server storage Turnkey/Driver Hardware
- 55. You Tube application interface Pandora socket server storage Turnkey/Driver Hardware
- 56. You Tube application interface Pandora socket server storage Twitter Turnkey/Driver Hardware
- 57. You Tube application interface Pandora socket server storage Twitter Turnkey/Driver Hardware
- 58. You Tube application interface Pandora socket server storage Twitter Turnkey/Driver Hardware
- 60. ● Prepare toolchain ● Configure with minimized features ● Resolve dependency & version conflict ● Resolve compilation error ● Test all functions in the target machine ● Reduce library size
- 62. Development Environment ● Ubuntu /OS ● Vim & plugin /editor ● Shell script /automation tool ● Meld /visual diff and merge tool ● SVN /version control system ● Jira /bug tracking system
- 63. Console Debug ● print_r(), var_dump() ● Xdebug & xdebug_debug_zval() ● log_errors & error_log in php.ini ● debugging level in config.ini
- 64. IDE Debug ● Set breakpoint ● Step into/step over/step out ● Watch variables ● Display call stack
- 67. Profiling ● Xdebug ● Kcachegrind ● VLD (Vulcan Logic Disassembler)
- 68. Xdebug ● Stack/function traces ● Code coverage analysis ● Time tracking ● Memory usage
- 70. tracefile-analyser ● Aggregate information from xdebug ● Sort by time/memory/calls
- 72. Kcachegrind ● Analyze xdebug profiling data ● Call graph viewer(callers/callees)
- 74. VLD ● An opcode dumper
- 76. array_push
- 77. array assignment
- 78. # of Opcodes = 16
- 79. # of Opcodes = 10
- 80. Tunning
- 81. Alternative PHP Cache (APC) source: http://www.slideshare.net/shire/php-tek-2008-apc-facebook
- 82. DB is always the bottleneck
- 83. 常見招數 ● 買好一點的硬體 ● 優化 SQL 語法 ● 關掉同步 commit ● 增加寫入 buffer 的大小 ● 增加 wait write 的 delay time ● … 等等
- 84. SQLite3 Tunning ● Configuration ● SQLITE_MAX_LENGTH=2147483647 ● SQLITE_MAX_SQL_LENGTH=1073741824 ● lock/unlock ● $handle->busyTimeout($time) ● Single statement ● Concat SQL string ● Begin; SQL; Commit;
- 85. Write an Extension ● --enable-debug --enable-maintainer-zts ● ext_skel $ vi ext/$extname/config.m4 $ ./buildconf $ ./configure –[with|enable]-$extname $ make $ ./php -f ext/$extname/$extname.php $ vi ext/$extname/$extname.c $ make
- 86. Extension for Debugging ● Change debugging level during runtime ● Dump debug information to a specific usb drive ● inotify + blkid
- 87. Integration
- 88. 這又是另外一個故事了
- 89. Thanks
- 90. Special Thanks ● Jeffrey Chen ● Simon Wang
- 91. Q &A