Escaping OOP boundaries

Most of developers are constantly teaching and discussing modern patterns, frameworks and libraries. But what if you think that you know almost everything about traditional OOP in PHP? I can bet that at some level of mastery you could notice that traditional object-oriented patterns do not solve all problems but introduce new questions instead. This is because OOP-way is not suited well for complex tasks.

Are you looking for the new food for thoughts about how such complex issues could be solved in PHP? For example how to make your existing method asynchronous just with one single word? Or how to reduce boilerplate code for feature toggles?

Join me and I will show you how to apply the most powerful aspect-oriented framework to escape from your existing OOP boundaries and teach you new patterns that can help you to keep your code clean.

Transcript

1. Escaping from OOP boundaries
   Alexander Lisachenko
   

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2. About me:
   2
   lisachenko
   lisachenko
   

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3. About me:
   ‣ Head of Web Development and
   Architecture at Alpari (RU) Forex Broker
   2
   lisachenko
   lisachenko
   

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4. About me:
   ‣ Head of Web Development and
   Architecture at Alpari (RU) Forex Broker
   ‣ Have worked with computers since 7
   years
   2
   lisachenko
   lisachenko
   

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5. About me:
   ‣ Head of Web Development and
   Architecture at Alpari (RU) Forex Broker
   ‣ Have worked with computers since 7
   years
   ‣ Clean code advocate, guru in the
   Enterprise Architecture
   2
   lisachenko
   lisachenko
   

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6. About me:
   ‣ Head of Web Development and
   Architecture at Alpari (RU) Forex Broker
   ‣ Have worked with computers since 7
   years
   ‣ Clean code advocate, guru in the
   Enterprise Architecture
   ‣ Author of the aspect-oriented
   framework Go! AOP 

   http://go.aopphp.com
   2
   lisachenko
   lisachenko
   

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7. 3
   Moscow PHP User Group
   

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8. 3
   Moscow PHP User Group
   

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9. Agenda:
   4
   

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10. Agenda:
    ‣ Object-Oriented Paradigm boundaries
    4
    

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11. Agenda:
    ‣ Object-Oriented Paradigm boundaries
    ‣ Escaping from PHP boundaries.
    4
    

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12. Agenda:
    ‣ Object-Oriented Paradigm boundaries
    ‣ Escaping from PHP boundaries.
    ‣ Stream wrapper and filters.
    4
    

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13. Agenda:
    ‣ Object-Oriented Paradigm boundaries
    ‣ Escaping from PHP boundaries.
    ‣ Stream wrapper and filters.
    ‣ Cross-Cutting concerns.
    4
    

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14. Agenda:
    ‣ Object-Oriented Paradigm boundaries
    ‣ Escaping from PHP boundaries.
    ‣ Stream wrapper and filters.
    ‣ Cross-Cutting concerns.
    ‣ Aspect-Oriented Programming with Go! AOP
    4
    

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15. Agenda:
    ‣ Object-Oriented Paradigm boundaries
    ‣ Escaping from PHP boundaries.
    ‣ Stream wrapper and filters.
    ‣ Cross-Cutting concerns.
    ‣ Aspect-Oriented Programming with Go! AOP
    ‣ Hacking the PHP. Native structures and
    opcodes.
    4
    

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16. 5
    OOP Boundaries
    

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17. 6
    Boundary 1: Open - Closed Principle
    

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18. 6
    Boundary 1: Open - Closed Principle
    

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19. Class is Open for extension, but
    Closed for modification
    7
    

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20. 8
    Final class prevents inheritance
    

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21. 8
    Final class prevents inheritance
    

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22. 9
    Final class prevents inheritance
    

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23. 9
    Final class prevents inheritance
    

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24. 9
    Final class prevents inheritance
    Fatal error: Class Child may not inherit from final class (Secret)
    

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25. 10
    Final method prevents overriding
    

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26. 10
    Final method prevents overriding
    

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27. 11
    Final method prevents overriding
    

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28. 11
    Final method prevents overriding
    

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29. 11
    Final method prevents overriding
    Fatal error: Cannot override final method Secret::test()
    

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30. 11
    Final method prevents overriding
    Fatal error: Cannot override final method Secret::test()
    

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31. 12
    Private modifier restricts access
    

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32. 12
    Private modifier restricts access
    

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33. 13
    Private modifier restricts access
    

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34. 13
    Private modifier restricts access
    

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35. 14
    Private modifier restricts access
    Uncaught Error: Call to private method Secret::test()
    

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36. 15
    Boundary 2: Immutable PHP structures
    

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37. 15
    Boundary 2: Immutable PHP structures
    

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38. 16
    PHP
    

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39. 16
    PHP
    Interpreter?
    

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40. 16
    PHP
    Interpreter? Compiler?
    

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41. 16
    PHP
    Interpreter? Compiler?
    BOTH!
    

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42. 17
    PHP Script
    

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43. 17
    PHP Script
    Execute
    

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44. 17
    PHP Script
    Parse
    Execute
    

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45. 17
    PHP Script
    Parse
    Execute
    Compile to OpCodes
    

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46. 17
    PHP Script
    Parse
    Execute
    Compile to OpCodes
    Execute(ZendEngine)
    

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47. 17
    PHP Script
    Parse
    Execute
    Compile to OpCodes
    Execute(ZendEngine)
    Output
    

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48. 17
    PHP Script
    Execute
    Execute(ZendEngine)
    Output
    Load OpCache <- Opcodes
    

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49. Once compiled into Opcodes, code can not be
    changed in runtime
    18
    

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50. 19
    OpCache:
    

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51. 19
    OpCache:
    +Fixed-size shared memory-block
    

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52. 19
    OpCache:
    +Fixed-size shared memory-block
    +Contains PHP binary structures
    

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53. 19
    OpCache:
    +Fixed-size shared memory-block
    +Contains PHP binary structures
    +Structures are immutable
    

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54. 19
    OpCache:
    +Fixed-size shared memory-block
    +Contains PHP binary structures
    +Structures are immutable
    +Append-only
    

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55. 20
    OpCache shared immutable data:
    

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56. 20
    OpCache shared immutable data:
    +File functions (HashTable)
    

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57. 20
    OpCache shared immutable data:
    +File functions (HashTable)
    +File classes (HashTable)
    

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58. 20
    OpCache shared immutable data:
    +File functions (HashTable)
    +File classes (HashTable)
    +File main OpArray
    

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59. 20
    OpCache shared immutable data:
    +File functions (HashTable)
    +File classes (HashTable)
    +File main OpArray
    +Interned strings and immutable arrays
    

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60. 20
    OpCache shared immutable data:
    +File functions (HashTable)
    +File classes (HashTable)
    +File main OpArray
    +Interned strings and immutable arrays
    +Meta-information (system_id, etc)
    

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61. Shared immutable OpCache improves PHP
    performance a lot
    21
    

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62. 22
    OpCache OOP restrictions:
    

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63. 22
    OpCache OOP restrictions:
    - Method could not be added/deleted or
    changed in runtime
    

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64. 22
    OpCache OOP restrictions:
    - Method could not be added/deleted or
    changed in runtime
    - Class, its parent, implemented interfaces and
    used traits are declared in compile-time,
    runtime API is not available
    

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65. 22
    OpCache OOP restrictions:
    - Method could not be added/deleted or
    changed in runtime
    - Class, its parent, implemented interfaces and
    used traits are declared in compile-time,
    runtime API is not available
    - Low-level access to the memory is restricted
    to prevents errors and memory leaks
    

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66. 22
    PS. Possible only with extensions like runkit, uopz, etc
    OpCache OOP restrictions:
    - Method could not be added/deleted or
    changed in runtime
    - Class, its parent, implemented interfaces and
    used traits are declared in compile-time,
    runtime API is not available
    - Low-level access to the memory is restricted
    to prevents errors and memory leaks
    

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67. 23
    Escaping from OOP Boundaries
    

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68. Сan we mock/extend a final class or
    override a final method?
    24
    

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69. Сan we mock/extend a final class or
    override a final method?
    24
    Yes?
    

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70. Сan we mock/extend a final class or
    override a final method?
    24
    Yes? No?
    

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71. The simplest solution is to not mark classes or
    methods as final!
    25
    

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72. 26
    Escape: uopz extension
    

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73. «uopz is a black magic extension
    of the runkit-and-scary-stuff genre,
    intended to help with QA infrastructure.
    27
    Joe Watkins
    

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74. 28
    Mocking a final class - uopz extension
    

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75. 28
    Mocking a final class - uopz extension
    

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76. 28
    Mocking a final class - uopz extension
    

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77. 29
    Escape: Replace the «file» stream wrapper
    

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78. 30
    Idea:
    

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79. 30
    Idea:
    ‣ PHP uses internal «file» wrapper for includes
    

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80. 30
    Idea:
    ‣ PHP uses internal «file» wrapper for includes
    ‣ We can unregister the «file» handler via
    stream_wrapper_unregister(‘file’)
    

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81. 30
    Idea:
    ‣ PHP uses internal «file» wrapper for includes
    ‣ We can unregister the «file» handler via
    stream_wrapper_unregister(‘file’)
    ‣ Register our own file handler via
    stream_wrapper_register(‘file’, self::class)
    

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82. 30
    Idea:
    ‣ PHP uses internal «file» wrapper for includes
    ‣ We can unregister the «file» handler via
    stream_wrapper_unregister(‘file’)
    ‣ Register our own file handler via
    stream_wrapper_register(‘file’, self::class)
    ‣ Can hook into the PHP source file now!
    

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83. 30
    Idea:
    ‣ PHP uses internal «file» wrapper for includes
    ‣ We can unregister the «file» handler via
    stream_wrapper_unregister(‘file’)
    ‣ Register our own file handler via
    stream_wrapper_register(‘file’, self::class)
    ‣ Can hook into the PHP source file now!
    ‣ Tokenise code with token_get_all($source)
    

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84. 30
    Idea:
    ‣ PHP uses internal «file» wrapper for includes
    ‣ We can unregister the «file» handler via
    stream_wrapper_unregister(‘file’)
    ‣ Register our own file handler via
    stream_wrapper_register(‘file’, self::class)
    ‣ Can hook into the PHP source file now!
    ‣ Tokenise code with token_get_all($source)
    ‣ Transform this source (eg. remove final keyword)
    

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85. 30
    Idea:
    ‣ PHP uses internal «file» wrapper for includes
    ‣ We can unregister the «file» handler via
    stream_wrapper_unregister(‘file’)
    ‣ Register our own file handler via
    stream_wrapper_register(‘file’, self::class)
    ‣ Can hook into the PHP source file now!
    ‣ Tokenise code with token_get_all($source)
    ‣ Transform this source (eg. remove final keyword)
    ‣ Give it back to the PHP to compile
    

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86. 31
    dg/bypass-finals library
    composer show dg/bypass-finals
    name : dg/bypass-finals
    descrip. : Removes final keyword from source code on-the-
    fly and allows mocking of final methods and classes
    keywords : testing, phpunit, unit, mocking, finals
    versions : dev-master, v1.1.2, v1.1.1, v1.1.0, v1.0.1, v1.0
    type : library
    

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87. 32
    Usage:
    

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88. 32
    Usage:
    You need to enable it before the classes you want to
    remove the final are loaded. So call it as soon as
    possible!
    

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89. 32
    Usage:
    You need to enable it before the classes you want to
    remove the final are loaded. So call it as soon as
    possible!
    PS. For additional details about PhpUnit integration, please read:
    https://www.tomasvotruba.cz/blog/2019/03/28/how-to-mock-final-classes-in-phpunit/
    

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90. 33
    antecedent/patchwork library
    composer show antecedent/patchwork
    name : antecedent/patchwork
    descrip. : Method redefinition (monkey-patching)
    functionality for PHP.
    keywords : aop, testing, aspect, runkit, redefinition,
    monkeypatching, interception
    versions : dev-master, 2.1.11, 2.1.10…
    type : library
    

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91. Write tests for your PHP code,
    not code for the tests.
    34
    

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92. 35
    Escape: Use PHP stream filters with includes
    

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93. 36
    Simple test file:
    

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94. 36
    Simple test file:
    

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95. 37
    Let’s craft our special include:
    

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96. 37
    Let’s craft our special include:
    

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97. 38
    It is become upper-cased:
    

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98. 38
    It is become upper-cased:
    

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99. Idea: we can register our own stream filter via
    stream_filter_register()
    to process a source code.
    39
    

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100. Cross-cutting concerns
     

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101. Cross-cutting concerns
     Data layer
     Service layer
     Controller layer
     

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102. Cross-cutting concerns
     Data layer
     Service layer
     Controller layer
     Authorization
     Logging
     Caching
     Transaction Control
     

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103. Cross-cutting concerns are aspects of a
     program that affect other domains.
     41
     

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104. Why?
     42
     

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105. Limitation of object-oriented
     representation of real life.
     43
     

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106. Joe Armstrong
     “…You wanted a banana but what
     you got was a gorilla holding the
     banana and the entire jungle”
     44
     

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107. Joe Armstrong
     “…You wanted a banana but what
     you got was a gorilla holding the
     banana and the entire jungle”
     44
     

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108. Example:
     45
     

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109. Example:
     45
     Implement an audit system that
     checks an access rights for each
     public method in all classes in our
     system and then logs this
     information into the security journal.
     

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110. Example:
     46
     

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111. Example:
     46
     

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112. Authorization:
     47
     

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113. Authorization:
     47
     

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114. Logging and audit:
     48
     

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115. Logging and audit:
     48
     

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116. Error handling
     49
     

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117. Error handling
     49
     

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118. Code tangling
     50
     

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119. Code tangling
     50
     

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120. Code tangling
     50
     

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121. Code scattering (duplication)
     51
     

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122. Code scattering (duplication)
     51
     

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123. Code scattering (duplication)
     51
     

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124. Cross-cutting concerns
     52
     

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125. 53
     Cross-cutting concerns
     

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126. Aspect-Oriented Paradigm
     

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127. Idea of AOP: extract cross-cutting concerns
     from general classes into the separate entities
     called aspects.
     55
     

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128. Authorization concern:
     56
     

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129. Authorization concern:
     56
     

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130. Authorization aspect:
     57
     

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131. Authorization aspect:
     57
     

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132. Authorization aspect:
     57
     Advice - event handler
     

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133. Authorization aspect:
     57
     Pointcut - describes list of
     interesting events
     Advice - event handler
     

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134. Authorization aspect:
     57
     Pointcut - describes list of
     interesting events
     Advice - event handler
     Joinpoint - defines an event
     object
     

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135. 58
     Aspect VS Event Listener
     

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136. 58
     Aspect VS Event Listener
     

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137. 58
     Aspect VS Event Listener
     

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138. 58
     Aspect VS Event Listener
     

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139. 59
     Advice types
     

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140. 59
     Advice types
     «Before» type
     

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141. 59
     Advice types
     «Before» type
     «After» type
     

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142. 59
     Advice types
     «Before» type
     «After» type
     «Around» type
     

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143. With AOP we can subscribe to any method
     without changing original code.
     60
     

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144. 61
     goaop/framework
     composer show goaop/framework
     name : goaop/framework
     descrip. : Framework for aspect-oriented programming in PHP.
     keywords : php, aop, library, aspect
     versions : 3.0.x-dev, 2.3.2,…
     type : library
     https://github.com/goaop/framework
     

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145. How it works?
     62
     

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146. How it works?
     62
     

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147. 63
     We use our trick with php://filter stream filter
     

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148. 64
     The composer class loader is replaced with a weaving
     proxy
     

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149. 65
     Lexical analysis and parsing of source code into the AST is
     performed
     (nikic/PHP-Parser)
     

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150. 66
     Static reflection is created from the AST
     (goaop/parser-reflection)
     

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151. 66
     Static reflection is created from the AST
     (goaop/parser-reflection)
     

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152. 66
     Static reflection is created from the AST
     (goaop/parser-reflection)
     

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153. 66
     Static reflection is created from the AST
     (goaop/parser-reflection)
     

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154. 67
     The original class is renamed and replaced with a new class
     with additional behavior; stored in the cache
     

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155. 67
     The original class is renamed and replaced with a new class
     with additional behavior; stored in the cache
     

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156. 67
     The original class is renamed and replaced with a new class
     with additional behavior; stored in the cache
     Same class name!
     

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157. 67
     The original class is renamed and replaced with a new class
     with additional behavior; stored in the cache
     Original class renamed
     Same class name!
     

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158. 67
     The original class is renamed and replaced with a new class
     with additional behavior; stored in the cache
     Original class renamed
     Overridden method
     Same class name!
     

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159. 68
     Deferred methods
     Runtime transformation of methods into deferred methods
     

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160. 68
     Deferred methods
     Runtime transformation of methods into deferred methods
     

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161. 69
     Example code
     

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162. 69
     Example code
     Some long service call
     

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163. 69
     Example code
     

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164. 70
     Idea: prevent execution of methods
     wrapping them into promises and run
     after the fastcgi_finish_request.
     

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165. 71
     Define an annotation-marker
     

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166. 72
     Define an aspect
     

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167. 72
     Define an aspect
     

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168. 72
     Define an aspect
     All methods with «Async» annotation
     

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169. 72
     Define an aspect
     Record each call with arguments
     

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170. 72
     Define an aspect
     Prevent execution of original method
     

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171. 72
     Define an aspect
     Return «our» value
     

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172. 73
     Define an aspect
     

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173. 73
     Define an aspect
     

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174. 73
     Define an aspect
     

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175. 73
     Define an aspect
     

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176. 73
     Define an aspect
     Finish FASTCGI Request
     

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177. 73
     Define an aspect
     Execute delayed methods
     

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178. 74
     Declare method as deferred
     

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179. 74
     Declare method as deferred
     

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180. 74
     Declare method as deferred
     Now it will be deferred
     

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181. Hacking the PHP engine
     

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182. Hacking the PHP engine
     

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184. 77
     FFI - Foreign Function Interface
     

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185. 77
     ‣ Available from PHP>=7.4
     FFI - Foreign Function Interface
     

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186. 77
     ‣ Available from PHP>=7.4
     ‣ Allows calling C functions
     FFI - Foreign Function Interface
     

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187. 77
     ‣ Available from PHP>=7.4
     ‣ Allows calling C functions
     ‣ Allows using C data types from pure scripting
     language
     FFI - Foreign Function Interface
     

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188. 77
     ‣ Available from PHP>=7.4
     ‣ Allows calling C functions
     ‣ Allows using C data types from pure scripting
     language
     ‣ Opens a way to write PHP extensions and
     bindings to C libraries in pure PHP
     FFI - Foreign Function Interface
     

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189. 77
     ‣ Available from PHP>=7.4
     ‣ Allows calling C functions
     ‣ Allows using C data types from pure scripting
     language
     ‣ Opens a way to write PHP extensions and
     bindings to C libraries in pure PHP
     ‣ Headers can be preloaded during server startup
     FFI - Foreign Function Interface
     

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190. 78
     FFI - Foreign Function Interface
     

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191. Idea: what if we use PHP’s FFI to access…
     79
     

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192. Idea: what if we use PHP’s FFI to access…
     79
     … PHP itself!
     

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193. Idea: what if we use PHP’s FFI to access…
     79
     … PHP itself!
     

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194. 80
     lisachenko/z-engine
     composer show lisachenko/z-engine
     name : lisachenko/z-engine
     descrip. : Library that provides direct access to native PHP
     structures.
     versions : dev-master, 0.5.0,…
     type : library
     https://github.com/lisachenko/z-engine
     

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195. 81
     lisachenko/z-engine
     

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196. 81
     ‣ Build on top of PHP’s Reflection API, eg
     ReflectionClass, ReflectionMethod
     lisachenko/z-engine
     

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197. 81
     ‣ Build on top of PHP’s Reflection API, eg
     ReflectionClass, ReflectionMethod
     ‣ Provides low-level binding to PHP’s structures
     like zval, zend_class_entry, zend_function
     and much more…
     lisachenko/z-engine
     

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198. 81
     ‣ Build on top of PHP’s Reflection API, eg
     ReflectionClass, ReflectionMethod
     ‣ Provides low-level binding to PHP’s structures
     like zval, zend_class_entry, zend_function
     and much more…
     ‣ Manipulates PHP itself in runtime
     lisachenko/z-engine
     

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199. 81
     ‣ Build on top of PHP’s Reflection API, eg
     ReflectionClass, ReflectionMethod
     ‣ Provides low-level binding to PHP’s structures
     like zval, zend_class_entry, zend_function
     and much more…
     ‣ Manipulates PHP itself in runtime
     ‣ Expect memory leaks and segfaults!
     lisachenko/z-engine
     

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200. 82
     Un-final class
     

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201. 82
     Un-final class
     

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202. 82
     Un-final class
     

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203. 82
     Un-final class
     

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204. 83
     Serializable Closure class
     

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205. 83
     Serializable Closure class
     

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206. 84
     Serializable Closure class
     

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207. 84
     Serializable Closure class
     

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208. 85
     Custom Throwable objects
     

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209. 86
     Custom Throwable objects
     

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210. 86
     Custom Throwable objects
     

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211. 87
     Native assembly methods in PHP
     

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212. 87
     Native assembly methods in PHP
     

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213. 88
     First ever assembly method in PHP
     

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214. 89
     What to expect:
     

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215. 89
     ‣ API for userland PHP extensions
     What to expect:
     

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216. 89
     ‣ API for userland PHP extensions
     ‣ OpCode manipulation and transformation
     What to expect:
     

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217. 89
     ‣ API for userland PHP extensions
     ‣ OpCode manipulation and transformation
     ‣ Shared objects (will survive between requests)
     What to expect:
     

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218. 89
     ‣ API for userland PHP extensions
     ‣ OpCode manipulation and transformation
     ‣ Shared objects (will survive between requests)
     ‣ Native hooks for PHP callbacks
     What to expect:
     

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219. 89
     ‣ API for userland PHP extensions
     ‣ OpCode manipulation and transformation
     ‣ Shared objects (will survive between requests)
     ‣ Native hooks for PHP callbacks
     ‣ Much more :)
     What to expect:
     

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222. Thank you for the attention!
     https://github.com/goaop
     https://github.com/lisachenko
     https://twitter.com/lisachenko
     Leave feedback at: https://joind.in/talk/310fd
     

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223. Go! AOP: Plugin for the PhpStorm
     92
     

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224. Pointcut syntax highlighting,
     completion and analysis
     93
     

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225. Pointcut syntax highlighting,
     completion and analysis
     93
     

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226. Navigate to advice/advised
     elements
     94
     

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227. Navigate to advice/advised
     elements
     94
     

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