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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 | |
6 | #use strict; |
7 | #use base qw/Catalyst::DispatchType/; |
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8 | use Text::SimpleTable; |
9 | use Catalyst::ActionChain; |
10 | use URI; |
11 | |
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12 | has _endpoints => ( |
13 | is => 'rw', |
14 | isa => 'ArrayRef', |
15 | required => 1, |
16 | default => sub{ [] }, |
17 | ); |
18 | |
19 | has _actions => ( |
20 | is => 'rw', |
21 | isa => 'HashRef', |
22 | required => 1, |
23 | default => sub{ {} }, |
24 | ); |
25 | |
26 | has _children_of => ( |
27 | is => 'rw', |
28 | isa => 'HashRef', |
29 | required => 1, |
30 | default => sub{ {} }, |
31 | ); |
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 } |
be5cb4e4 |
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, $path ) = @_; |
123 | |
124 | return 0 if @{$c->req->args}; |
125 | |
126 | my @parts = split('/', $path); |
127 | |
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128 | my ($chain, $captures, $parts) = $self->recurse_match($c, '/', \@parts); |
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129 | push @{$c->req->args}, @$parts if $parts && @$parts; |
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130 | |
131 | return 0 unless $chain; |
132 | |
133 | my $action = Catalyst::ActionChain->from_chain($chain); |
134 | |
135 | $c->req->action("/${action}"); |
136 | $c->req->match("/${action}"); |
137 | $c->req->captures($captures); |
138 | $c->action($action); |
139 | $c->namespace( $action->namespace ); |
140 | |
141 | return 1; |
142 | } |
143 | |
144 | =head2 $self->recurse_match( $c, $parent, \@path_parts ) |
145 | |
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146 | Recursive search for a matching chain. |
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147 | |
148 | =cut |
149 | |
150 | sub recurse_match { |
151 | my ( $self, $c, $parent, $path_parts ) = @_; |
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152 | my $children = $self->_children_of->{$parent}; |
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153 | return () unless $children; |
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154 | my $best_action; |
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155 | my @captures; |
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156 | TRY: foreach my $try_part (sort { length($b) <=> length($a) } |
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157 | keys %$children) { |
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158 | # $b then $a to try longest part first |
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159 | my @parts = @$path_parts; |
160 | if (length $try_part) { # test and strip PathPart |
161 | next TRY unless |
162 | ($try_part eq join('/', # assemble equal number of parts |
163 | splice( # and strip them off @parts as well |
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164 | @parts, 0, scalar(@{[split('/', $try_part)]}) |
165 | ))); # @{[]} to avoid split to @_ |
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166 | } |
167 | my @try_actions = @{$children->{$try_part}}; |
168 | TRY_ACTION: foreach my $action (@try_actions) { |
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169 | if (my $capture_attr = $action->attributes->{CaptureArgs}) { |
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170 | |
171 | # Short-circuit if not enough remaining parts |
172 | next TRY_ACTION unless @parts >= $capture_attr->[0]; |
173 | |
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174 | my @captures; |
175 | my @parts = @parts; # localise |
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176 | |
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177 | # strip CaptureArgs into list |
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178 | push(@captures, splice(@parts, 0, $capture_attr->[0])); |
179 | |
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180 | # try the remaining parts against children of this action |
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181 | my ($actions, $captures, $action_parts) = $self->recurse_match( |
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182 | $c, '/'.$action->reverse, \@parts |
183 | ); |
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184 | if ($actions && (!$best_action || $#$action_parts < $#{$best_action->{parts}})){ |
185 | $best_action = { |
186 | actions => [ $action, @$actions ], |
187 | captures=> [ @captures, @$captures ], |
188 | parts => $action_parts |
189 | }; |
190 | } |
191 | } |
192 | else { |
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193 | { |
194 | local $c->req->{arguments} = [ @{$c->req->args}, @parts ]; |
195 | next TRY_ACTION unless $action->match($c); |
196 | } |
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197 | my $args_attr = $action->attributes->{Args}->[0]; |
198 | |
199 | # No best action currently |
200 | # OR This one matches with fewer parts left than the current best action, |
201 | # And therefore is a better match |
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202 | # OR No parts and this expects 0 |
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203 | # The current best action might also be Args(0), |
204 | # but we couldn't chose between then anyway so we'll take the last seen |
205 | |
206 | if (!$best_action || |
207 | @parts < @{$best_action->{parts}} || |
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208 | (!@parts && $args_attr eq 0)){ |
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209 | $best_action = { |
210 | actions => [ $action ], |
211 | captures=> [], |
212 | parts => \@parts |
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213 | } |
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214 | } |
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215 | } |
216 | } |
217 | } |
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218 | return @$best_action{qw/actions captures parts/} if $best_action; |
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219 | return (); |
220 | } |
221 | |
222 | =head2 $self->register( $c, $action ) |
223 | |
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224 | Calls register_path for every Path attribute for the given $action. |
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225 | |
226 | =cut |
227 | |
228 | sub register { |
229 | my ( $self, $c, $action ) = @_; |
230 | |
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231 | my @chained_attr = @{ $action->attributes->{Chained} || [] }; |
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232 | |
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233 | return 0 unless @chained_attr; |
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234 | |
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235 | if (@chained_attr > 2) { |
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236 | Catalyst::Exception->throw( |
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237 | "Multiple Chained attributes not supported registering ${action}" |
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238 | ); |
239 | } |
240 | |
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241 | my $parent = $chained_attr[0]; |
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242 | |
243 | if (defined($parent) && length($parent)) { |
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244 | if ($parent eq '.') { |
245 | $parent = '/'.$action->namespace; |
246 | } elsif ($parent !~ m/^\//) { |
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247 | if ($action->namespace) { |
248 | $parent = '/'.join('/', $action->namespace, $parent); |
249 | } else { |
250 | $parent = '/'.$parent; # special case namespace '' (root) |
251 | } |
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252 | } |
253 | } else { |
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254 | $parent = '/' |
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255 | } |
256 | |
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257 | $action->attributes->{Chained} = [ $parent ]; |
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258 | |
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259 | my $children = ($self->_children_of->{$parent} ||= {}); |
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260 | |
261 | my @path_part = @{ $action->attributes->{PathPart} || [] }; |
262 | |
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263 | my $part = $action->name; |
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264 | |
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265 | if (@path_part == 1 && defined $path_part[0]) { |
266 | $part = $path_part[0]; |
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267 | } elsif (@path_part > 1) { |
268 | Catalyst::Exception->throw( |
269 | "Multiple PathPart attributes not supported registering ${action}" |
270 | ); |
271 | } |
272 | |
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273 | if ($part =~ m(^/)) { |
274 | Catalyst::Exception->throw( |
275 | "Absolute parameters to PathPart not allowed registering ${action}" |
276 | ); |
277 | } |
278 | |
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279 | $action->attributes->{PartPath} = [ $part ]; |
280 | |
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281 | unshift(@{ $children->{$part} ||= [] }, $action); |
282 | |
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283 | $self->_actions->{'/'.$action->reverse} = $action; |
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284 | |
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285 | unless ($action->attributes->{CaptureArgs}) { |
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286 | unshift(@{ $self->_endpoints }, $action); |
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287 | } |
288 | |
289 | return 1; |
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290 | } |
291 | |
292 | =head2 $self->uri_for_action($action, $captures) |
293 | |
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294 | Get the URI part for the action, using C<$captures> to fill |
295 | the capturing parts. |
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296 | |
297 | =cut |
298 | |
299 | sub uri_for_action { |
300 | my ( $self, $action, $captures ) = @_; |
301 | |
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302 | return undef unless ($action->attributes->{Chained} |
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303 | && !$action->attributes->{CaptureArgs}); |
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304 | |
305 | my @parts = (); |
306 | my @captures = @$captures; |
307 | my $parent = "DUMMY"; |
308 | my $curr = $action; |
309 | while ($curr) { |
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310 | if (my $cap = $curr->attributes->{CaptureArgs}) { |
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311 | return undef unless @captures >= $cap->[0]; # not enough captures |
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312 | if ($cap->[0]) { |
313 | unshift(@parts, splice(@captures, -$cap->[0])); |
314 | } |
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315 | } |
316 | if (my $pp = $curr->attributes->{PartPath}) { |
317 | unshift(@parts, $pp->[0]) |
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318 | if (defined($pp->[0]) && length($pp->[0])); |
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319 | } |
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320 | $parent = $curr->attributes->{Chained}->[0]; |
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321 | $curr = $self->_actions->{$parent}; |
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322 | } |
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323 | |
324 | return undef unless $parent eq '/'; # fail for dangling action |
325 | |
326 | return undef if @captures; # fail for too many captures |
327 | |
328 | return join('/', '', @parts); |
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329 | |
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330 | } |
331 | |
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332 | =head1 USAGE |
333 | |
334 | =head2 Introduction |
335 | |
336 | The C<Chained> attribute allows you to chain public path parts together |
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337 | by their private names. A chain part's path can be specified with |
338 | C<PathPart> and can be declared to expect an arbitrary number of |
339 | arguments. The endpoint of the chain specifies how many arguments it |
340 | gets through the C<Args> attribute. C<:Args(0)> would be none at all, |
341 | C<:Args> without an integer would be unlimited. The path parts that |
342 | aren't endpoints are using C<CaptureArgs> to specify how many parameters |
343 | they expect to receive. As an example setup: |
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344 | |
345 | package MyApp::Controller::Greeting; |
346 | use base qw/ Catalyst::Controller /; |
347 | |
348 | # this is the beginning of our chain |
349 | sub hello : PathPart('hello') Chained('/') CaptureArgs(1) { |
350 | my ( $self, $c, $integer ) = @_; |
351 | $c->stash->{ message } = "Hello "; |
352 | $c->stash->{ arg_sum } = $integer; |
353 | } |
354 | |
355 | # this is our endpoint, because it has no :CaptureArgs |
356 | sub world : PathPart('world') Chained('hello') Args(1) { |
357 | my ( $self, $c, $integer ) = @_; |
358 | $c->stash->{ message } .= "World!"; |
359 | $c->stash->{ arg_sum } += $integer; |
360 | |
361 | $c->response->body( join "<br/>\n" => |
362 | $c->stash->{ message }, $c->stash->{ arg_sum } ); |
363 | } |
364 | |
365 | The debug output provides a separate table for chained actions, showing |
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366 | the whole chain as it would match and the actions it contains. Here's an |
367 | example of the startup output with our actions above: |
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368 | |
369 | ... |
370 | [debug] Loaded Path Part actions: |
371 | .-----------------------+------------------------------. |
372 | | Path Spec | Private | |
373 | +-----------------------+------------------------------+ |
374 | | /hello/*/world/* | /greeting/hello (1) | |
375 | | | => /greeting/world | |
376 | '-----------------------+------------------------------' |
377 | ... |
378 | |
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379 | As you can see, Catalyst only deals with chains as whole paths and |
380 | builds one for each endpoint, which are the actions with C<:Chained> but |
381 | without C<:CaptureArgs>. |
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382 | |
383 | Let's assume this application gets a request at the path |
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384 | C</hello/23/world/12>. What happens then? First, Catalyst will dispatch |
385 | to the C<hello> action and pass the value C<23> as an argument to it |
386 | after the context. It does so because we have previously used |
387 | C<:CaptureArgs(1)> to declare that it has one path part after itself as |
388 | its argument. We told Catalyst that this is the beginning of the chain |
389 | by specifying C<:Chained('/')>. Also note that instead of saying |
390 | C<:PathPart('hello')> we could also just have said C<:PathPart>, as it |
391 | defaults to the name of the action. |
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392 | |
393 | After C<hello> has run, Catalyst goes on to dispatch to the C<world> |
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394 | action. This is the last action to be called: Catalyst knows this is an |
395 | endpoint because we did not specify a C<:CaptureArgs> |
396 | attribute. Nevertheless we specify that this action expects an argument, |
397 | but at this point we're using C<:Args(1)> to do that. We could also have |
398 | said C<:Args> or left it out altogether, which would mean this action |
399 | would get all arguments that are there. This action's C<:Chained> |
400 | attribute says C<hello> and tells Catalyst that the C<hello> action in |
401 | the current controller is its parent. |
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402 | |
403 | With this we have built a chain consisting of two public path parts. |
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404 | C<hello> captures one part of the path as its argument, and also |
405 | specifies the path root as its parent. So this part is |
406 | C</hello/$arg>. The next part is the endpoint C<world>, expecting one |
407 | argument. It sums up to the path part C<world/$arg>. This leads to a |
408 | complete chain of C</hello/$arg/world/$arg> which is matched against the |
409 | requested paths. |
410 | |
411 | This example application would, if run and called by e.g. |
412 | C</hello/23/world/12>, set the stash value C<message> to "Hello" and the |
413 | value C<arg_sum> to "23". The C<world> action would then append "World!" |
414 | to C<message> and add C<12> to the stash's C<arg_sum> value. For the |
415 | sake of simplicity no view is shown. Instead we just put the values of |
416 | the stash into our body. So the output would look like: |
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417 | |
418 | Hello World! |
419 | 35 |
420 | |
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421 | And our test server would have given us this debugging output for the |
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422 | request: |
423 | |
424 | ... |
425 | [debug] "GET" request for "hello/23/world/12" from "127.0.0.1" |
426 | [debug] Path is "/greeting/world" |
427 | [debug] Arguments are "12" |
428 | [info] Request took 0.164113s (6.093/s) |
429 | .------------------------------------------+-----------. |
430 | | Action | Time | |
431 | +------------------------------------------+-----------+ |
432 | | /greeting/hello | 0.000029s | |
433 | | /greeting/world | 0.000024s | |
434 | '------------------------------------------+-----------' |
435 | ... |
436 | |
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437 | What would be common uses of this dispatch technique? It gives the |
438 | possibility to split up logic that contains steps that each depend on |
439 | each other. An example would be, for example, a wiki path like |
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440 | C</wiki/FooBarPage/rev/23/view>. This chain can be easily built with |
441 | these actions: |
442 | |
443 | sub wiki : PathPart('wiki') Chained('/') CaptureArgs(1) { |
444 | my ( $self, $c, $page_name ) = @_; |
445 | # load the page named $page_name and put the object |
446 | # into the stash |
447 | } |
448 | |
449 | sub rev : PathPart('rev') Chained('wiki') CaptureArgs(1) { |
450 | my ( $self, $c, $revision_id ) = @_; |
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451 | # use the page object in the stash to get at its |
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452 | # revision with number $revision_id |
453 | } |
454 | |
455 | sub view : PathPart Chained('rev') Args(0) { |
456 | my ( $self, $c ) = @_; |
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457 | # display the revision in our stash. Another option |
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458 | # would be to forward a compatible object to the action |
459 | # that displays the default wiki pages, unless we want |
460 | # a different interface here, for example restore |
461 | # functionality. |
462 | } |
463 | |
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464 | It would now be possible to add other endpoints, for example C<restore> |
465 | to restore this specific revision as the current state. |
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466 | |
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467 | You don't have to put all the chained actions in one controller. The |
468 | specification of the parent through C<:Chained> also takes an absolute |
469 | action path as its argument. Just specify it with a leading C</>. |
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470 | |
471 | If you want, for example, to have actions for the public paths |
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472 | C</foo/12/edit> and C</foo/12>, just specify two actions with |
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473 | C<:PathPart('foo')> and C<:Chained('/')>. The handler for the former |
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474 | path needs a C<:CaptureArgs(1)> attribute and a endpoint with |
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475 | C<:PathPart('edit')> and C<:Chained('foo')>. For the latter path give |
476 | the action just a C<:Args(1)> to mark it as endpoint. This sums up to |
477 | this debugging output: |
478 | |
479 | ... |
480 | [debug] Loaded Path Part actions: |
481 | .-----------------------+------------------------------. |
482 | | Path Spec | Private | |
483 | +-----------------------+------------------------------+ |
484 | | /foo/* | /controller/foo_view | |
485 | | /foo/*/edit | /controller/foo_load (1) | |
486 | | | => /controller/edit | |
487 | '-----------------------+------------------------------' |
488 | ... |
489 | |
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490 | Here's a more detailed specification of the attributes belonging to |
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491 | C<:Chained>: |
492 | |
493 | =head2 Attributes |
494 | |
495 | =over 8 |
496 | |
497 | =item PathPart |
498 | |
499 | Sets the name of this part of the chain. If it is specified without |
500 | arguments, it takes the name of the action as default. So basically |
501 | C<sub foo :PathPart> and C<sub foo :PathPart('foo')> are identical. |
502 | This can also contain slashes to bind to a deeper level. An action |
503 | with C<sub bar :PathPart('foo/bar') :Chained('/')> would bind to |
504 | C</foo/bar/...>. If you don't specify C<:PathPart> it has the same |
505 | effect as using C<:PathPart>, it would default to the action name. |
506 | |
507 | =item Chained |
508 | |
509 | Has to be specified for every child in the chain. Possible values are |
510 | absolute and relative private action paths, with the relatives pointing |
511 | to the current controller, or a single slash C</> to tell Catalyst that |
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512 | this is the root of a chain. The attribute C<:Chained> without arguments |
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513 | also defaults to the C</> behavior. |
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514 | |
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515 | Because you can specify an absolute path to the parent action, it |
516 | doesn't matter to Catalyst where that parent is located. So, if your |
517 | design requests it, you can redispatch a chain through any controller or |
518 | namespace you want. |
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519 | |
520 | Another interesting possibility gives C<:Chained('.')>, which chains |
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521 | itself to an action with the path of the current controller's namespace. |
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522 | For example: |
523 | |
524 | # in MyApp::Controller::Foo |
525 | sub bar : Chained CaptureArgs(1) { ... } |
526 | |
527 | # in MyApp::Controller::Foo::Bar |
528 | sub baz : Chained('.') Args(1) { ... } |
529 | |
530 | This builds up a chain like C</bar/*/baz/*>. The specification of C<.> |
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531 | as the argument to Chained here chains the C<baz> action to an action |
532 | with the path of the current controller namespace, namely |
533 | C</foo/bar>. That action chains directly to C</>, so the C</bar/*/baz/*> |
534 | chain comes out as the end product. |
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535 | |
536 | =item CaptureArgs |
537 | |
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538 | Must be specified for every part of the chain that is not an |
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539 | endpoint. With this attribute Catalyst knows how many of the following |
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540 | parts of the path (separated by C</>) this action wants to capture as |
541 | its arguments. If it doesn't expect any, just specify |
542 | C<:CaptureArgs(0)>. The captures get passed to the action's C<@_> right |
543 | after the context, but you can also find them as array references in |
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544 | C<$c-E<gt>request-E<gt>captures-E<gt>[$level]>. The C<$level> is the |
545 | level of the action in the chain that captured the parts of the path. |
546 | |
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547 | An action that is part of a chain (that is, one that has a C<:Chained> |
548 | attribute) but has no C<:CaptureArgs> attribute is treated by Catalyst |
549 | as a chain end. |
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550 | |
551 | =item Args |
552 | |
553 | By default, endpoints receive the rest of the arguments in the path. You |
554 | can tell Catalyst through C<:Args> explicitly how many arguments your |
555 | endpoint expects, just like you can with C<:CaptureArgs>. Note that this |
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556 | also affects whether this chain is invoked on a request. A chain with an |
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557 | endpoint specifying one argument will only match if exactly one argument |
558 | exists in the path. |
559 | |
560 | You can specify an exact number of arguments like C<:Args(3)>, including |
561 | C<0>. If you just say C<:Args> without any arguments, it is the same as |
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562 | leaving it out altogether: The chain is matched regardless of the number |
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563 | of path parts after the endpoint. |
564 | |
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565 | Just as with C<:CaptureArgs>, the arguments get passed to the action in |
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566 | C<@_> after the context object. They can also be reached through |
567 | C<$c-E<gt>request-E<gt>arguments>. |
568 | |
569 | =back |
570 | |
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571 | =head2 Auto actions, dispatching and forwarding |
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572 | |
573 | Note that the list of C<auto> actions called depends on the private path |
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574 | of the endpoint of the chain, not on the chained actions way. The |
575 | C<auto> actions will be run before the chain dispatching begins. In |
576 | every other aspect, C<auto> actions behave as documented. |
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577 | |
578 | The C<forward>ing to other actions does just what you would expect. But if |
579 | you C<detach> out of a chain, the rest of the chain will not get called |
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580 | after the C<detach>. |
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581 | |
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582 | =head1 AUTHOR |
583 | |
792b40ac |
584 | Matt S Trout <mst@shadowcatsystems.co.uk> |
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585 | |
586 | =head1 COPYRIGHT |
587 | |
588 | This program is free software, you can redistribute it and/or modify it under |
589 | the same terms as Perl itself. |
590 | |
591 | =cut |
592 | |
593 | 1; |