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1 | package Catalyst::DispatchType::Chained; |
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2 | |
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3 | use Moose; |
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4 | extends 'Catalyst::DispatchType'; |
5 | |
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6 | use Text::SimpleTable; |
7 | use Catalyst::ActionChain; |
8 | use URI; |
9 | |
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10 | has _endpoints => ( |
11 | is => 'rw', |
12 | isa => 'ArrayRef', |
13 | required => 1, |
14 | default => sub{ [] }, |
15 | ); |
16 | |
17 | has _actions => ( |
18 | is => 'rw', |
19 | isa => 'HashRef', |
20 | required => 1, |
21 | default => sub{ {} }, |
22 | ); |
23 | |
24 | has _children_of => ( |
25 | is => 'rw', |
26 | isa => 'HashRef', |
27 | required => 1, |
28 | default => sub{ {} }, |
29 | ); |
30 | |
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31 | no Moose; |
32 | |
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33 | # please don't perltidy this. hairy code within. |
34 | |
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35 | =head1 NAME |
36 | |
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37 | Catalyst::DispatchType::Chained - Path Part DispatchType |
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38 | |
39 | =head1 SYNOPSIS |
40 | |
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41 | # root action - captures one argument after it |
42 | sub foo_setup : Chained('/') PathPart('foo') CaptureArgs(1) { |
43 | my ( $self, $c, $foo_arg ) = @_; |
44 | ... |
45 | } |
46 | |
47 | # child action endpoint - takes one argument |
48 | sub bar : Chained('foo_setup') Args(1) { |
49 | my ( $self, $c, $bar_arg ) = @_; |
50 | ... |
51 | } |
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52 | |
53 | =head1 DESCRIPTION |
54 | |
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55 | See L</USAGE>. |
56 | |
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57 | =head1 METHODS |
58 | |
59 | =head2 $self->list($c) |
60 | |
61 | Debug output for Path Part dispatch points |
62 | |
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63 | =cut |
64 | |
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65 | sub list { |
66 | my ( $self, $c ) = @_; |
67 | |
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68 | return unless $self->_endpoints; |
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69 | |
70 | my $paths = Text::SimpleTable->new( |
71 | [ 35, 'Path Spec' ], [ 36, 'Private' ] |
72 | ); |
73 | |
74 | ENDPOINT: foreach my $endpoint ( |
75 | sort { $a->reverse cmp $b->reverse } |
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76 | @{ $self->_endpoints } |
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77 | ) { |
78 | my $args = $endpoint->attributes->{Args}->[0]; |
79 | my @parts = (defined($args) ? (("*") x $args) : '...'); |
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80 | my @parents = (); |
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81 | my $parent = "DUMMY"; |
82 | my $curr = $endpoint; |
83 | while ($curr) { |
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84 | if (my $cap = $curr->attributes->{CaptureArgs}) { |
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85 | unshift(@parts, (("*") x $cap->[0])); |
86 | } |
87 | if (my $pp = $curr->attributes->{PartPath}) { |
88 | unshift(@parts, $pp->[0]) |
89 | if (defined $pp->[0] && length $pp->[0]); |
90 | } |
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91 | $parent = $curr->attributes->{Chained}->[0]; |
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92 | $curr = $self->_actions->{$parent}; |
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93 | unshift(@parents, $curr) if $curr; |
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94 | } |
95 | next ENDPOINT unless $parent eq '/'; # skip dangling action |
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96 | my @rows; |
97 | foreach my $p (@parents) { |
98 | my $name = "/${p}"; |
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99 | if (my $cap = $p->attributes->{CaptureArgs}) { |
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100 | $name .= ' ('.$cap->[0].')'; |
101 | } |
102 | unless ($p eq $parents[0]) { |
103 | $name = "-> ${name}"; |
104 | } |
105 | push(@rows, [ '', $name ]); |
106 | } |
107 | push(@rows, [ '', (@rows ? "=> " : '')."/${endpoint}" ]); |
108 | $rows[0][0] = join('/', '', @parts); |
109 | $paths->row(@$_) for @rows; |
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110 | } |
111 | |
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112 | $c->log->debug( "Loaded Chained actions:\n" . $paths->draw . "\n" ); |
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113 | } |
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114 | |
115 | =head2 $self->match( $c, $path ) |
116 | |
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117 | Calls C<recurse_match> to see if a chain matches the C<$path>. |
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118 | |
119 | =cut |
120 | |
121 | sub match { |
122 | my ( $self, $c, $path ) = @_; |
123 | |
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124 | my $request = $c->request; |
125 | return 0 if @{$request->args}; |
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126 | |
127 | my @parts = split('/', $path); |
128 | |
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129 | my ($chain, $captures, $parts) = $self->recurse_match($c, '/', \@parts); |
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130 | push @{$request->args}, @$parts if $parts && @$parts; |
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131 | |
132 | return 0 unless $chain; |
133 | |
134 | my $action = Catalyst::ActionChain->from_chain($chain); |
135 | |
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136 | $request->action("/${action}"); |
137 | $request->match("/${action}"); |
138 | $request->captures($captures); |
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139 | $c->action($action); |
140 | $c->namespace( $action->namespace ); |
141 | |
142 | return 1; |
143 | } |
144 | |
145 | =head2 $self->recurse_match( $c, $parent, \@path_parts ) |
146 | |
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147 | Recursive search for a matching chain. |
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148 | |
149 | =cut |
150 | |
151 | sub recurse_match { |
152 | my ( $self, $c, $parent, $path_parts ) = @_; |
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153 | my $children = $self->_children_of->{$parent}; |
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154 | return () unless $children; |
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155 | my $best_action; |
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156 | my @captures; |
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157 | TRY: foreach my $try_part (sort { length($b) <=> length($a) } |
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158 | keys %$children) { |
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159 | # $b then $a to try longest part first |
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160 | my @parts = @$path_parts; |
161 | if (length $try_part) { # test and strip PathPart |
162 | next TRY unless |
163 | ($try_part eq join('/', # assemble equal number of parts |
164 | splice( # and strip them off @parts as well |
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165 | @parts, 0, scalar(@{[split('/', $try_part)]}) |
166 | ))); # @{[]} to avoid split to @_ |
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167 | } |
168 | my @try_actions = @{$children->{$try_part}}; |
169 | TRY_ACTION: foreach my $action (@try_actions) { |
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170 | if (my $capture_attr = $action->attributes->{CaptureArgs}) { |
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171 | |
172 | # Short-circuit if not enough remaining parts |
173 | next TRY_ACTION unless @parts >= $capture_attr->[0]; |
174 | |
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175 | my @captures; |
176 | my @parts = @parts; # localise |
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177 | |
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178 | # strip CaptureArgs into list |
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179 | push(@captures, splice(@parts, 0, $capture_attr->[0])); |
180 | |
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181 | # try the remaining parts against children of this action |
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182 | my ($actions, $captures, $action_parts) = $self->recurse_match( |
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183 | $c, '/'.$action->reverse, \@parts |
184 | ); |
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185 | if ($actions && (!$best_action || $#$action_parts < $#{$best_action->{parts}})){ |
186 | $best_action = { |
187 | actions => [ $action, @$actions ], |
188 | captures=> [ @captures, @$captures ], |
189 | parts => $action_parts |
190 | }; |
191 | } |
192 | } |
193 | else { |
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194 | { |
195 | local $c->req->{arguments} = [ @{$c->req->args}, @parts ]; |
196 | next TRY_ACTION unless $action->match($c); |
197 | } |
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198 | my $args_attr = $action->attributes->{Args}->[0]; |
199 | |
200 | # No best action currently |
201 | # OR This one matches with fewer parts left than the current best action, |
202 | # And therefore is a better match |
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203 | # OR No parts and this expects 0 |
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204 | # The current best action might also be Args(0), |
205 | # but we couldn't chose between then anyway so we'll take the last seen |
206 | |
207 | if (!$best_action || |
208 | @parts < @{$best_action->{parts}} || |
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209 | (!@parts && $args_attr eq 0)){ |
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210 | $best_action = { |
211 | actions => [ $action ], |
212 | captures=> [], |
213 | parts => \@parts |
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214 | } |
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215 | } |
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216 | } |
217 | } |
218 | } |
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219 | return @$best_action{qw/actions captures parts/} if $best_action; |
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220 | return (); |
221 | } |
222 | |
223 | =head2 $self->register( $c, $action ) |
224 | |
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225 | Calls register_path for every Path attribute for the given $action. |
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226 | |
227 | =cut |
228 | |
229 | sub register { |
230 | my ( $self, $c, $action ) = @_; |
231 | |
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232 | my @chained_attr = @{ $action->attributes->{Chained} || [] }; |
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233 | |
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234 | return 0 unless @chained_attr; |
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235 | |
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236 | if (@chained_attr > 2) { |
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237 | Catalyst::Exception->throw( |
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238 | "Multiple Chained attributes not supported registering ${action}" |
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239 | ); |
240 | } |
241 | |
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242 | my $parent = $chained_attr[0]; |
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243 | |
244 | if (defined($parent) && length($parent)) { |
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245 | if ($parent eq '.') { |
246 | $parent = '/'.$action->namespace; |
247 | } elsif ($parent !~ m/^\//) { |
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248 | if ($action->namespace) { |
249 | $parent = '/'.join('/', $action->namespace, $parent); |
250 | } else { |
251 | $parent = '/'.$parent; # special case namespace '' (root) |
252 | } |
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253 | } |
254 | } else { |
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255 | $parent = '/' |
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256 | } |
257 | |
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258 | $action->attributes->{Chained} = [ $parent ]; |
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259 | |
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260 | my $children = ($self->_children_of->{$parent} ||= {}); |
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261 | |
262 | my @path_part = @{ $action->attributes->{PathPart} || [] }; |
263 | |
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264 | my $part = $action->name; |
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265 | |
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266 | if (@path_part == 1 && defined $path_part[0]) { |
267 | $part = $path_part[0]; |
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268 | } elsif (@path_part > 1) { |
269 | Catalyst::Exception->throw( |
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270 | "Multiple PathPart attributes not supported registering " . $action->reverse() |
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271 | ); |
272 | } |
273 | |
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274 | if ($part =~ m(^/)) { |
275 | Catalyst::Exception->throw( |
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276 | "Absolute parameters to PathPart not allowed registering " . $action->reverse() |
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277 | ); |
278 | } |
279 | |
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280 | $action->attributes->{PartPath} = [ $part ]; |
281 | |
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282 | unshift(@{ $children->{$part} ||= [] }, $action); |
283 | |
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284 | $self->_actions->{'/'.$action->reverse} = $action; |
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285 | |
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286 | unless ($action->attributes->{CaptureArgs}) { |
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287 | unshift(@{ $self->_endpoints }, $action); |
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288 | } |
289 | |
290 | return 1; |
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291 | } |
292 | |
293 | =head2 $self->uri_for_action($action, $captures) |
294 | |
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295 | Get the URI part for the action, using C<$captures> to fill |
296 | the capturing parts. |
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297 | |
298 | =cut |
299 | |
300 | sub uri_for_action { |
301 | my ( $self, $action, $captures ) = @_; |
302 | |
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303 | return undef unless ($action->attributes->{Chained} |
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304 | && !$action->attributes->{CaptureArgs}); |
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305 | |
306 | my @parts = (); |
307 | my @captures = @$captures; |
308 | my $parent = "DUMMY"; |
309 | my $curr = $action; |
310 | while ($curr) { |
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311 | if (my $cap = $curr->attributes->{CaptureArgs}) { |
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312 | return undef unless @captures >= $cap->[0]; # not enough captures |
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313 | if ($cap->[0]) { |
314 | unshift(@parts, splice(@captures, -$cap->[0])); |
315 | } |
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316 | } |
317 | if (my $pp = $curr->attributes->{PartPath}) { |
318 | unshift(@parts, $pp->[0]) |
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319 | if (defined($pp->[0]) && length($pp->[0])); |
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320 | } |
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321 | $parent = $curr->attributes->{Chained}->[0]; |
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322 | $curr = $self->_actions->{$parent}; |
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323 | } |
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324 | |
325 | return undef unless $parent eq '/'; # fail for dangling action |
326 | |
327 | return undef if @captures; # fail for too many captures |
328 | |
329 | return join('/', '', @parts); |
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330 | |
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331 | } |
332 | |
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333 | __PACKAGE__->meta->make_immutable; |
334 | |
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335 | =head1 USAGE |
336 | |
337 | =head2 Introduction |
338 | |
339 | The C<Chained> attribute allows you to chain public path parts together |
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340 | by their private names. A chain part's path can be specified with |
341 | C<PathPart> and can be declared to expect an arbitrary number of |
342 | arguments. The endpoint of the chain specifies how many arguments it |
343 | gets through the C<Args> attribute. C<:Args(0)> would be none at all, |
344 | C<:Args> without an integer would be unlimited. The path parts that |
345 | aren't endpoints are using C<CaptureArgs> to specify how many parameters |
346 | they expect to receive. As an example setup: |
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347 | |
348 | package MyApp::Controller::Greeting; |
349 | use base qw/ Catalyst::Controller /; |
350 | |
351 | # this is the beginning of our chain |
352 | sub hello : PathPart('hello') Chained('/') CaptureArgs(1) { |
353 | my ( $self, $c, $integer ) = @_; |
354 | $c->stash->{ message } = "Hello "; |
355 | $c->stash->{ arg_sum } = $integer; |
356 | } |
357 | |
358 | # this is our endpoint, because it has no :CaptureArgs |
359 | sub world : PathPart('world') Chained('hello') Args(1) { |
360 | my ( $self, $c, $integer ) = @_; |
361 | $c->stash->{ message } .= "World!"; |
362 | $c->stash->{ arg_sum } += $integer; |
363 | |
364 | $c->response->body( join "<br/>\n" => |
365 | $c->stash->{ message }, $c->stash->{ arg_sum } ); |
366 | } |
367 | |
368 | The debug output provides a separate table for chained actions, showing |
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369 | the whole chain as it would match and the actions it contains. Here's an |
370 | example of the startup output with our actions above: |
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371 | |
372 | ... |
373 | [debug] Loaded Path Part actions: |
374 | .-----------------------+------------------------------. |
375 | | Path Spec | Private | |
376 | +-----------------------+------------------------------+ |
377 | | /hello/*/world/* | /greeting/hello (1) | |
378 | | | => /greeting/world | |
379 | '-----------------------+------------------------------' |
380 | ... |
381 | |
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382 | As you can see, Catalyst only deals with chains as whole paths and |
383 | builds one for each endpoint, which are the actions with C<:Chained> but |
384 | without C<:CaptureArgs>. |
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385 | |
386 | Let's assume this application gets a request at the path |
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387 | C</hello/23/world/12>. What happens then? First, Catalyst will dispatch |
388 | to the C<hello> action and pass the value C<23> as an argument to it |
389 | after the context. It does so because we have previously used |
390 | C<:CaptureArgs(1)> to declare that it has one path part after itself as |
391 | its argument. We told Catalyst that this is the beginning of the chain |
392 | by specifying C<:Chained('/')>. Also note that instead of saying |
393 | C<:PathPart('hello')> we could also just have said C<:PathPart>, as it |
394 | defaults to the name of the action. |
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395 | |
396 | After C<hello> has run, Catalyst goes on to dispatch to the C<world> |
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397 | action. This is the last action to be called: Catalyst knows this is an |
398 | endpoint because we did not specify a C<:CaptureArgs> |
399 | attribute. Nevertheless we specify that this action expects an argument, |
400 | but at this point we're using C<:Args(1)> to do that. We could also have |
401 | said C<:Args> or left it out altogether, which would mean this action |
402 | would get all arguments that are there. This action's C<:Chained> |
403 | attribute says C<hello> and tells Catalyst that the C<hello> action in |
404 | the current controller is its parent. |
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405 | |
406 | With this we have built a chain consisting of two public path parts. |
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407 | C<hello> captures one part of the path as its argument, and also |
408 | specifies the path root as its parent. So this part is |
409 | C</hello/$arg>. The next part is the endpoint C<world>, expecting one |
410 | argument. It sums up to the path part C<world/$arg>. This leads to a |
411 | complete chain of C</hello/$arg/world/$arg> which is matched against the |
412 | requested paths. |
413 | |
414 | This example application would, if run and called by e.g. |
415 | C</hello/23/world/12>, set the stash value C<message> to "Hello" and the |
416 | value C<arg_sum> to "23". The C<world> action would then append "World!" |
417 | to C<message> and add C<12> to the stash's C<arg_sum> value. For the |
418 | sake of simplicity no view is shown. Instead we just put the values of |
419 | the stash into our body. So the output would look like: |
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420 | |
421 | Hello World! |
422 | 35 |
423 | |
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424 | And our test server would have given us this debugging output for the |
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425 | request: |
426 | |
427 | ... |
428 | [debug] "GET" request for "hello/23/world/12" from "127.0.0.1" |
429 | [debug] Path is "/greeting/world" |
430 | [debug] Arguments are "12" |
431 | [info] Request took 0.164113s (6.093/s) |
432 | .------------------------------------------+-----------. |
433 | | Action | Time | |
434 | +------------------------------------------+-----------+ |
435 | | /greeting/hello | 0.000029s | |
436 | | /greeting/world | 0.000024s | |
437 | '------------------------------------------+-----------' |
438 | ... |
439 | |
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440 | What would be common uses of this dispatch technique? It gives the |
441 | possibility to split up logic that contains steps that each depend on |
442 | each other. An example would be, for example, a wiki path like |
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443 | C</wiki/FooBarPage/rev/23/view>. This chain can be easily built with |
444 | these actions: |
445 | |
446 | sub wiki : PathPart('wiki') Chained('/') CaptureArgs(1) { |
447 | my ( $self, $c, $page_name ) = @_; |
448 | # load the page named $page_name and put the object |
449 | # into the stash |
450 | } |
451 | |
452 | sub rev : PathPart('rev') Chained('wiki') CaptureArgs(1) { |
453 | my ( $self, $c, $revision_id ) = @_; |
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454 | # use the page object in the stash to get at its |
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455 | # revision with number $revision_id |
456 | } |
457 | |
458 | sub view : PathPart Chained('rev') Args(0) { |
459 | my ( $self, $c ) = @_; |
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460 | # display the revision in our stash. Another option |
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461 | # would be to forward a compatible object to the action |
462 | # that displays the default wiki pages, unless we want |
463 | # a different interface here, for example restore |
464 | # functionality. |
465 | } |
466 | |
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467 | It would now be possible to add other endpoints, for example C<restore> |
468 | to restore this specific revision as the current state. |
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469 | |
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470 | You don't have to put all the chained actions in one controller. The |
471 | specification of the parent through C<:Chained> also takes an absolute |
472 | action path as its argument. Just specify it with a leading C</>. |
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473 | |
474 | If you want, for example, to have actions for the public paths |
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475 | C</foo/12/edit> and C</foo/12>, just specify two actions with |
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476 | C<:PathPart('foo')> and C<:Chained('/')>. The handler for the former |
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477 | path needs a C<:CaptureArgs(1)> attribute and a endpoint with |
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478 | C<:PathPart('edit')> and C<:Chained('foo')>. For the latter path give |
479 | the action just a C<:Args(1)> to mark it as endpoint. This sums up to |
480 | this debugging output: |
481 | |
482 | ... |
483 | [debug] Loaded Path Part actions: |
484 | .-----------------------+------------------------------. |
485 | | Path Spec | Private | |
486 | +-----------------------+------------------------------+ |
487 | | /foo/* | /controller/foo_view | |
488 | | /foo/*/edit | /controller/foo_load (1) | |
489 | | | => /controller/edit | |
490 | '-----------------------+------------------------------' |
491 | ... |
492 | |
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493 | Here's a more detailed specification of the attributes belonging to |
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494 | C<:Chained>: |
495 | |
496 | =head2 Attributes |
497 | |
498 | =over 8 |
499 | |
500 | =item PathPart |
501 | |
502 | Sets the name of this part of the chain. If it is specified without |
503 | arguments, it takes the name of the action as default. So basically |
504 | C<sub foo :PathPart> and C<sub foo :PathPart('foo')> are identical. |
505 | This can also contain slashes to bind to a deeper level. An action |
506 | with C<sub bar :PathPart('foo/bar') :Chained('/')> would bind to |
507 | C</foo/bar/...>. If you don't specify C<:PathPart> it has the same |
508 | effect as using C<:PathPart>, it would default to the action name. |
509 | |
510 | =item Chained |
511 | |
512 | Has to be specified for every child in the chain. Possible values are |
513 | absolute and relative private action paths, with the relatives pointing |
514 | to the current controller, or a single slash C</> to tell Catalyst that |
83784422 |
515 | this is the root of a chain. The attribute C<:Chained> without arguments |
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516 | also defaults to the C</> behavior. |
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517 | |
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518 | Because you can specify an absolute path to the parent action, it |
519 | doesn't matter to Catalyst where that parent is located. So, if your |
520 | design requests it, you can redispatch a chain through any controller or |
521 | namespace you want. |
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522 | |
523 | Another interesting possibility gives C<:Chained('.')>, which chains |
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524 | itself to an action with the path of the current controller's namespace. |
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525 | For example: |
526 | |
527 | # in MyApp::Controller::Foo |
528 | sub bar : Chained CaptureArgs(1) { ... } |
529 | |
530 | # in MyApp::Controller::Foo::Bar |
531 | sub baz : Chained('.') Args(1) { ... } |
532 | |
533 | This builds up a chain like C</bar/*/baz/*>. The specification of C<.> |
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534 | as the argument to Chained here chains the C<baz> action to an action |
535 | with the path of the current controller namespace, namely |
536 | C</foo/bar>. That action chains directly to C</>, so the C</bar/*/baz/*> |
537 | chain comes out as the end product. |
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538 | |
539 | =item CaptureArgs |
540 | |
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541 | Must be specified for every part of the chain that is not an |
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542 | endpoint. With this attribute Catalyst knows how many of the following |
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543 | parts of the path (separated by C</>) this action wants to capture as |
544 | its arguments. If it doesn't expect any, just specify |
545 | C<:CaptureArgs(0)>. The captures get passed to the action's C<@_> right |
546 | after the context, but you can also find them as array references in |
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547 | C<$c-E<gt>request-E<gt>captures-E<gt>[$level]>. The C<$level> is the |
548 | level of the action in the chain that captured the parts of the path. |
549 | |
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550 | An action that is part of a chain (that is, one that has a C<:Chained> |
551 | attribute) but has no C<:CaptureArgs> attribute is treated by Catalyst |
552 | as a chain end. |
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553 | |
554 | =item Args |
555 | |
556 | By default, endpoints receive the rest of the arguments in the path. You |
557 | can tell Catalyst through C<:Args> explicitly how many arguments your |
558 | endpoint expects, just like you can with C<:CaptureArgs>. Note that this |
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559 | also affects whether this chain is invoked on a request. A chain with an |
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560 | endpoint specifying one argument will only match if exactly one argument |
561 | exists in the path. |
562 | |
563 | You can specify an exact number of arguments like C<:Args(3)>, including |
564 | C<0>. If you just say C<:Args> without any arguments, it is the same as |
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565 | leaving it out altogether: The chain is matched regardless of the number |
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566 | of path parts after the endpoint. |
567 | |
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568 | Just as with C<:CaptureArgs>, the arguments get passed to the action in |
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569 | C<@_> after the context object. They can also be reached through |
570 | C<$c-E<gt>request-E<gt>arguments>. |
571 | |
572 | =back |
573 | |
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574 | =head2 Auto actions, dispatching and forwarding |
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575 | |
576 | Note that the list of C<auto> actions called depends on the private path |
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577 | of the endpoint of the chain, not on the chained actions way. The |
578 | C<auto> actions will be run before the chain dispatching begins. In |
579 | every other aspect, C<auto> actions behave as documented. |
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580 | |
581 | The C<forward>ing to other actions does just what you would expect. But if |
582 | you C<detach> out of a chain, the rest of the chain will not get called |
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583 | after the C<detach>. |
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584 | |
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585 | =head1 AUTHOR |
586 | |
792b40ac |
587 | Matt S Trout <mst@shadowcatsystems.co.uk> |
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588 | |
589 | =head1 COPYRIGHT |
590 | |
591 | This program is free software, you can redistribute it and/or modify it under |
592 | the same terms as Perl itself. |
593 | |
594 | =cut |
595 | |
596 | 1; |