Mercurial > pub > Impl

annotate Lib/IMPL/Web/Handler/RestController.pm @ 213:d6e2ea24af08

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author sergey
date Fri, 03 Aug 2012 01:15:15 +0400
parents 292226770180
children 47f77e6409f7
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1 package IMPL::Web::Handler::RestController;
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2 use strict;
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3
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4 use IMPL::lang qw(:declare :constants);
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5
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6
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7 use IMPL::declare {
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8 require => {
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9 Exception => 'IMPL::Exception',
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10 ArgumentExecption => '-IMPL::InvalidArgumentException',
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11 HttpException => 'IMPL::Web::Exception',
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12 NotFoundException => 'IMPL::Web::NotFoundException'
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13 },
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14 base => {
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15 'IMPL::Object' => undef,
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16 'IMPL::Object::Autofill' => '@_',
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17 'IMPL::Object::Serializable' => undef
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18 }
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19 };
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20
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21 BEGIN {
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22 public property root => PROP_GET | PROP_OWNERSET;
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23 public property contract => PROP_GET | PROP_OWNERSET;
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24 }
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25
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26 sub CTOR {
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27 my ($this) = @_;
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28
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29 die ArgumentException->new("root") unless $this->root;
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30 die ArgumentException->new("contract") unless $this->contract;
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31 }
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32
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33 sub Invoke {
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34 my ($this,$action) = @_;
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35
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36 my $query = $action->query;
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37
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38 my $method = $query->request_method;
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39
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40 #TODO: path_info is broken for IIS
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41 my $pathInfo = $query->path_info;
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42 my @segments;
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43
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44 if (length $pathInfo) {
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45
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46 @segments = split /\//, $pathInfo, -1; # keep trailing empty string if present
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47
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48 # remove first segment since it's always empty
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49 shift @segments;
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50
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51 my ($obj,$view) = (pop(@segments) =~ m/(.*?)(?:\.(\w+))?$/);
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52 push @segments, $obj;
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53
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54 }
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55
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57 my $res = $this->contract->Transform($this->root, { id => '' } );
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58
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59 while(@segments) {
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60 my $id = shift @segments;
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61
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62 $res = $res->FetchChildResource($id,$action);
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63
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64 die NotFoundException->new($pathInfo,$id) unless $res;
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65 }
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66
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67 $res = $res->InvokeHttpMethod($method,$action);
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68 }
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69
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70 1;
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71
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72 __END__
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73
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74 =pod
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75
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76 =head1 NAME
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77
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78 C<IMPL::Web::Handler::RestController> - Транслирует запросы к ресурсам в вызовы методов.
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79
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80 =head1 SYNOPSIS
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81
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82 Использует контракты для преобразования стандартных C<REST> запросов в вызовы методов объектов.
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83 C<$ENV{PATH_INFO}> используется как путь к нужному ресурсу у которого будет вызван метод указанный в запросе.
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84
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85 =head1 DESCRIPTION
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86
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87 =head2 Resource model
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88
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89 Ресурсы имеют иерархическую структуру, аналогичную файлам и каталогам, которая описывается контрактом, также
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90 контрак описывает то, как должны обрабатываться методы C<HTTP> запроса, такие как C<GET> и C<POST>.
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91
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92 За корректность реализации данных методов отвечает разработчик.
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93
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94 Каждый ресурс представляет собой коллкецию вложенных ресурсов, путь указанный в C<HTTP> запросе разбивается на
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95 части, затем каждый сегмент последовательно используется для поиска дочернего ресурса. При обработки
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96 первого сегмента используется корневой ресурс. Корневой ресурс должен существовать всегда.
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97
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98 =head2 Contract
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99
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100 Контрактом может быть любое преобразование которое определяет соответсвие между объектами приложения и
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101 ресурсами, доступными через протокол C<HTTP>.
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102
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103
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105
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106 =cut