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annotate Lib/IMPL/Web/Handler/ErrorHandler.pm @ 231:ff1e8fa932f2

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author sergey
date Tue, 09 Oct 2012 03:09:41 +0400
parents 6d8092d8ce1b
children 3cebcf6fdb9b
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1 package IMPL::Web::Handler::ErrorHandler;
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2 use strict;
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3
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4 use IMPL::lang qw(:declare :constants is);
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5 use IMPL::Exception();
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6 use IMPL::declare {
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7 require => {
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8 WebException => 'IMPL::Web::Exception',
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9 ArgumentException => '-IMPL::InvalidArgumentException',
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10 IOException => '-IMPL::IOException',
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11 HttpResponse => 'IMPL::Web::HttpResponse'
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12 },
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13 base => {
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14 'IMPL::Object' => undef,
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15 'IMPL::Object::Autofill' => '@_',
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16 'IMPL::Object::Serializable' => undef
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17 }
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18 };
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19
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20 BEGIN {
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21 public property errors => PROP_ALL;
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22 public property loader => PROP_ALL;
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23 public property fallback => PROP_ALL;
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24 public property contentType => PROP_ALL;
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25 }
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26
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27 sub CTOR {
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28 my ($this) = @_;
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29
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30 die ArgumentException->new("loader") unless $this->loader;
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31 die ArgumentException->new("fallback") unless $this->fallback;
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32
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33 $this->errors({}) unless $this->errors;
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34
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35 }
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36
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37 sub Invoke {
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38 my ($this,$action,$next) = @_;
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39
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40 undef $@;
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41 my $result;
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42 eval {
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43 $result = $next ? $next->($action) : undef;
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44 };
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45
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46 if (my $err = $@) {
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47
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48 my $vars = {
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49 error => $err
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50 };
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51
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52 my $status = "500 Internal Server Error";
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53
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54 if (eval { $err->isa(WebException) }) {
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55 $status = $err->status;
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56 }
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57
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58 my ($code) = ($status =~ m/^(\d+)/);
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59
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60 my $doc = $this->loader->document(
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61 $this->errors->{$code} || $this->fallback,
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62 $vars
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63 );
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65 my $text = $doc->Render($vars);
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66
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67 $result = HttpResponse->new(
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68 status => $status,
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69 type => $this->contentType,
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70 charset => 'utf-8',
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71 headers => eval{ $err->headers } || {},
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72 body => $text
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73 );
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74 }
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75
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76 return $result;
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77 }
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78
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79 1;
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80
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81 __END__
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82
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83 =pod
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84
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85 =head1 NAME
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86
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87 C<IMPL::Web::Handler::ErrorHandler> - обертка для обработки исключений.
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89 =head1 SYNOPSIS
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90
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91 Используется в цеопчке обработчиков приложения.
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92
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93 =begin code xml
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94
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95 <handlers type="ARRAY">
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96 <item type="IMPL::Web::Handler::ErrorHandler">
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97 <contentType>text/html</contentType>
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98 <loader refid="tt-loader"/>
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99 <errors type="HASH">
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100 <error extname="500">errors/500</error>
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101 <error extname="404">errors/404</error>
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102 <error extname="403">errors/403</error>
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103 </errors>
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104 <fallback>errors/500</fallback>
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105 </item>
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106 </handlers>
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107
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108 =end code xml
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109
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110 =head1 DESCRIPTION
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111
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112 Позволяет создать представление для ресурса в случае ошибки, для этого
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113 используется соответствие представлений и кодов ошибок.
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114
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115 В результате обработчик либо прозрачно передает результат вышестоящего
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116 обработчика нижестоящему, либо создает C<IMPL::Web::HttpResponse> с
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117 соответствующим статусом и содержанием.
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118
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119 =cut