trusty (3) Mojolicious::Controller.3pm.gz
NAME
Mojolicious::Controller - Controller base class
SYNOPSIS
# Controller
package MyApp::Foo;
use Mojo::Base 'Mojolicious::Controller';
# Action
sub bar {
my $self = shift;
my $name = $self->param('name');
$self->res->headers->cache_control('max-age=1, no-cache');
$self->render(json => {hello => $name});
}
DESCRIPTION
Mojolicious::Controller is the base class for your Mojolicious controllers. It is also the default
controller class unless you set "controller_class" in Mojolicious.
ATTRIBUTES
Mojolicious::Controller inherits all attributes from Mojo::Base and implements the following new ones.
app
my $app = $c->app;
$c = $c->app(Mojolicious->new);
A reference back to the application that dispatched to this controller, defaults to a Mojolicious object.
# Use application logger
$c->app->log->debug('Hello Mojo!');
# Generate path
my $path = $c->app->home->rel_file('templates/foo/bar.html.ep');
match
my $m = $c->match;
$c = $c->match(Mojolicious::Routes::Match->new);
Router results for the current request, defaults to a Mojolicious::Routes::Match object.
# Introspect
my $foo = $c->match->endpoint->pattern->defaults->{foo};
my $bar = $c->match->stack->[-1]{bar};
tx
my $tx = $c->tx;
$c = $c->tx(Mojo::Transaction::HTTP->new);
The transaction that is currently being processed, usually a Mojo::Transaction::HTTP or
Mojo::Transaction::WebSocket object. Note that this reference is usually weakened, so the object needs to
be referenced elsewhere as well when you're performing non-blocking operations and the underlying
connection might get closed early.
# Check peer information
my $address = $c->tx->remote_address;
my $port = $c->tx->remote_port;
# Perform non-blocking operation without knowing the connection status
my $tx = $c->tx;
Mojo::IOLoop->timer(2 => sub {
$c->app->log->debug($tx->is_finished ? 'Finished.' : 'In progress.');
});
METHODS
Mojolicious::Controller inherits all methods from Mojo::Base and implements the following new ones.
continue
$c->continue;
Continue dispatch chain.
cookie
my $value = $c->cookie('foo');
my @values = $c->cookie('foo');
$c = $c->cookie(foo => 'bar');
$c = $c->cookie(foo => 'bar', {path => '/'});
Access request cookie values and create new response cookies.
# Create response cookie with domain and expiration date
$c->cookie(user => 'sri', {domain => 'example.com', expires => time + 60});
finish
$c = $c->finish;
$c = $c->finish(1000);
$c = $c->finish(1003 => 'Cannot accept data!');
$c = $c->finish('Bye!');
Close WebSocket connection or long poll stream gracefully.
flash
my $foo = $c->flash('foo');
$c = $c->flash({foo => 'bar'});
$c = $c->flash(foo => 'bar');
Data storage persistent only for the next request, stored in the "session".
# Show message after redirect
$c->flash(message => 'User created successfully!');
$c->redirect_to('show_user', id => 23);
on
my $cb = $c->on(finish => sub {...});
Subscribe to events of "tx", which is usually a Mojo::Transaction::HTTP or Mojo::Transaction::WebSocket
object. Note that this method will automatically respond to WebSocket handshake requests with a 101
response status.
# Do something after the transaction has been finished
$c->on(finish => sub {
my $c = shift;
$c->app->log->debug('We are done!');
});
# Receive WebSocket message
$c->on(message => sub {
my ($c, $msg) = @_;
$c->app->log->debug("Message: $msg");
});
# Receive JSON object via WebSocket message
$c->on(json => sub {
my ($c, $hash) = @_;
$c->app->log->debug("Test: $hash->{test}");
});
# Receive WebSocket "Binary" message
$c->on(binary => sub {
my ($c, $bytes) = @_;
my $len = length $bytes;
$c->app->log->debug("Received $len bytes.");
});
param
my @names = $c->param;
my $foo = $c->param('foo');
my @foo = $c->param('foo');
my ($foo, $bar) = $c->param(['foo', 'bar']);
$c = $c->param(foo => 'ba;r');
$c = $c->param(foo => qw(ba;r ba;z));
Access route placeholder values that are not reserved stash values, file uploads and GET/POST parameters,
in that order. Note that this method is context sensitive in some cases and therefore needs to be used
with care, there can always be multiple values, which might have unexpected consequences. Parts of the
request body need to be loaded into memory to parse POST parameters, so you have to make sure it is not
excessively large.
# List context is ambiguous and should be avoided
my $hash = {foo => $self->param('foo')};
# Better enforce scalar context
my $hash = {foo => scalar $self->param('foo')};
# The multi name form can also enforce scalar context
my $hash = {foo => $self->param(['foo'])};
For more control you can also access request information directly.
# Only GET parameters
my $foo = $c->req->url->query->param('foo');
# Only GET and POST parameters
my $foo = $c->req->param('foo');
# Only file uploads
my $foo = $c->req->upload('foo');
redirect_to
$c = $c->redirect_to('named', foo => 'bar');
$c = $c->redirect_to('named', {foo => 'bar'});
$c = $c->redirect_to('/perldoc');
$c = $c->redirect_to('http://mojolicio.us/perldoc');
Prepare a 302 redirect response, takes the same arguments as "url_for".
# Conditional redirect
return $c->redirect_to('login') unless $c->session('user');
# Moved permanently
$c->res->code(301);
$c->redirect_to('some_route');
render
my $bool = $c->render;
my $bool = $c->render(controller => 'foo', action => 'bar');
my $bool = $c->render(template => 'foo/index');
my $bool = $c->render(template => 'index', format => 'html');
my $bool = $c->render(data => $bytes);
my $bool = $c->render(text => 'Hello!');
my $bool = $c->render(json => {foo => 'bar'});
my $bool = $c->render(handler => 'something');
my $bool = $c->render('foo/index');
my $output = $c->render('foo/index', partial => 1);
Render content using "render" in Mojolicious::Renderer and emit hook "after_render" in Mojolicious unless
the result is "partial". If no template is provided a default one based on controller and action or route
name will be generated, all additional values get merged into the "stash".
render_exception
$c = $c->render_exception('Oops!');
$c = $c->render_exception(Mojo::Exception->new('Oops!'));
Render the exception template "exception.$mode.$format.*" or "exception.$format.*" and set the response
status code to 500. Also sets the stash values "exception" to a Mojo::Exception object and "snapshot" to
a copy of the "stash" for use in the templates.
render_later
$c = $c->render_later;
Disable automatic rendering to delay response generation, only necessary if automatic rendering would
result in a response.
# Delayed rendering
$c->render_later;
Mojo::IOLoop->timer(2 => sub {
$c->render(text => 'Delayed by 2 seconds!');
});
render_maybe
my $bool = $c->render_maybe;
my $bool = $c->render_maybe(controller => 'foo', action => 'bar');
my $bool = $c->render_maybe('foo/index', format => 'html');
Try to render content but do not call "render_not_found" if no response could be generated, takes the
same arguments as "render".
# Render template "index_local" only if it exists
$self->render_maybe('index_local') or $self->render('index');
render_not_found
$c = $c->render_not_found;
Render the not found template "not_found.$mode.$format.*" or "not_found.$format.*" and set the response
status code to 404.
render_static
my $bool = $c->render_static('images/logo.png');
my $bool = $c->render_static('../lib/MyApp.pm');
Render a static file using "serve" in Mojolicious::Static, usually from the "public" directories or
"DATA" sections of your application. Note that this method does not protect from traversing to parent
directories.
rendered
$c = $c->rendered;
$c = $c->rendered(302);
Finalize response and emit hook "after_dispatch" in Mojolicious, defaults to using a 200 response code.
req
my $req = $c->req;
Get Mojo::Message::Request object from "req" in Mojo::Transaction.
# Longer version
my $req = $c->tx->req;
# Extract request information
my $url = $c->req->url->to_abs;
my $userinfo = $c->req->url->to_abs->userinfo;
my $host = $c->req->url->to_abs->host;
my $agent = $c->req->headers->user_agent;
my $bytes = $c->req->body;
my $str = $c->req->text;
my $hash = $c->req->json;
my $foo = $c->req->json('/23/foo');
my $dom = $c->req->dom;
my $bar = $c->req->dom('div.bar')->first->text;
res
my $res = $c->res;
Get Mojo::Message::Response object from "res" in Mojo::Transaction.
# Longer version
my $res = $c->tx->res;
# Force file download by setting a custom response header
$c->res->headers->content_disposition('attachment; filename=foo.png;');
respond_to
$c = $c->respond_to(
json => {json => {message => 'Welcome!'}},
html => {template => 'welcome'},
any => sub {...}
);
Automatically select best possible representation for resource from "Accept" request header, "format"
stash value or "format" GET/POST parameter, defaults to rendering an empty 204 response. Since browsers
often don't really know what they actually want, unspecific "Accept" request headers with more than one
MIME type will be ignored, unless the "X-Requested-With" header is set to the value "XMLHttpRequest".
$c->respond_to(
json => sub { $c->render(json => {just => 'works'}) },
xml => {text => '<just>works</just>'},
any => {data => '', status => 204}
);
send
$c = $c->send({binary => $bytes});
$c = $c->send({text => $bytes});
$c = $c->send({json => {test => [1, 2, 3]}});
$c = $c->send([$fin, $rsv1, $rsv2, $rsv3, $op, $payload]);
$c = $c->send($chars);
$c = $c->send($chars => sub {...});
Send message or frame non-blocking via WebSocket, the optional drain callback will be invoked once all
data has been written. Note that this method will automatically respond to WebSocket handshake requests
with a 101 response status.
# Send "Text" message
$c->send('I X Mojolicious!');
# Send JSON object as "Text" message
$c->send({json => {test => 'I X Mojolicious!'}});
# Send JSON object as "Binary" message
use Mojo::JSON 'j';
$c->send({binary => j({test => 'I X Mojolicious!'})});
# Send "Ping" frame
$c->send([1, 0, 0, 0, 9, 'Hello World!']);
# Make sure previous message has been written before continuing
$c->send('First message!' => sub {
my $c = shift;
$c->send('Second message!');
});
For mostly idle WebSockets you might also want to increase the inactivity timeout, which usually defaults
to 15 seconds.
# Increase inactivity timeout for connection to 300 seconds
Mojo::IOLoop->stream($c->tx->connection)->timeout(300);
session
my $session = $c->session;
my $foo = $c->session('foo');
$c = $c->session({foo => 'bar'});
$c = $c->session(foo => 'bar');
Persistent data storage, all session data gets serialized with Mojo::JSON and stored "Base64" encoded in
"HMAC-SHA1" signed cookies. Note that cookies usually have a 4096 byte limit, depending on browser.
# Manipulate session
$c->session->{foo} = 'bar';
my $foo = $c->session->{foo};
delete $c->session->{foo};
# Expiration date in seconds from now (persists between requests)
$c->session(expiration => 604800);
# Expiration date as absolute epoch time (only valid for one request)
$c->session(expires => time + 604800);
# Delete whole session by setting an expiration date in the past
$c->session(expires => 1);
signed_cookie
my $value = $c->signed_cookie('foo');
my @values = $c->signed_cookie('foo');
$c = $c->signed_cookie(foo => 'bar');
$c = $c->signed_cookie(foo => 'bar', {path => '/'});
Access signed request cookie values and create new signed response cookies. Cookies failing "HMAC-SHA1"
signature verification will be automatically discarded.
stash
my $hash = $c->stash;
my $foo = $c->stash('foo');
$c = $c->stash({foo => 'bar'});
$c = $c->stash(foo => 'bar');
Non persistent data storage and exchange, application wide default values can be set with "defaults" in
Mojolicious. Some stash values have a special meaning and are reserved, the full list is currently
"action", "app", "cb", "controller", "data", "extends", "format", "handler", "json", "layout",
"namespace", "partial", "path", "status", "template" and "text". Note that all stash values with a
"mojo.*" prefix are reserved for internal use.
# Remove value
my $foo = delete $c->stash->{foo};
url_for
my $url = $c->url_for;
my $url = $c->url_for(name => 'sebastian');
my $url = $c->url_for({name => 'sebastian'});
my $url = $c->url_for('test', name => 'sebastian');
my $url = $c->url_for('test', {name => 'sebastian'});
my $url = $c->url_for('/perldoc');
my $url = $c->url_for('//mojolicio.us/perldoc');
my $url = $c->url_for('http://mojolicio.us/perldoc');
my $url = $c->url_for('mailto:sri@example.com');
Generate a portable Mojo::URL object with base for a path, URL or route.
# "http://127.0.0.1:3000/perldoc" if application has been started with Morbo
$c->url_for('/perldoc')->to_abs;
# "/perldoc?foo=bar" if application is deployed under "/"
$c->url_for('/perldoc')->query(foo => 'bar');
# "/myapp/perldoc?foo=bar" if application is deployed under "/myapp"
$c->url_for('/perldoc')->query(foo => 'bar');
You can also use the helper "url_with" in Mojolicious::Plugin::DefaultHelpers to inherit query parameters
from the current request.
# "/list?q=mojo&page=2" if current request was for "/list?q=mojo&page=1"
$c->url_with->query([page => 2]);
validation
my $validation = $c->validation;
Get Mojolicious::Validator::Validation object for current request to validate GET/POST parameters. Parts
of the request body need to be loaded into memory to parse POST parameters, so you have to make sure it
is not excessively large.
my $validation = $c->validation;
$validation->required('title')->size(3, 50);
my $title = $validation->param('title');
write
$c = $c->write;
$c = $c->write($bytes);
$c = $c->write(sub {...});
$c = $c->write($bytes => sub {...});
Write dynamic content non-blocking, the optional drain callback will be invoked once all data has been
written.
# Keep connection alive (with Content-Length header)
$c->res->headers->content_length(6);
$c->write('Hel' => sub {
my $c = shift;
$c->write('lo!')
});
# Close connection when finished (without Content-Length header)
$c->write('Hel' => sub {
my $c = shift;
$c->write('lo!' => sub {
my $c = shift;
$c->finish;
});
});
For Comet (long polling) you might also want to increase the inactivity timeout, which usually defaults
to 15 seconds.
# Increase inactivity timeout for connection to 300 seconds
Mojo::IOLoop->stream($c->tx->connection)->timeout(300);
write_chunk
$c = $c->write_chunk;
$c = $c->write_chunk($bytes);
$c = $c->write_chunk(sub {...});
$c = $c->write_chunk($bytes => sub {...});
Write dynamic content non-blocking with "chunked" transfer encoding, the optional drain callback will be
invoked once all data has been written.
# Make sure previous chunk has been written before continuing
$c->write_chunk('He' => sub {
my $c = shift;
$c->write_chunk('ll' => sub {
my $c = shift;
$c->finish('o!');
});
});
You can call "finish" at any time to end the stream.
2
He
2
ll
2
o!
0
HELPERS
In addition to the attributes and methods above you can also call helpers on Mojolicious::Controller
objects. This includes all helpers from Mojolicious::Plugin::DefaultHelpers and
Mojolicious::Plugin::TagHelpers.
$c->layout('green');
$c->title('Welcome!');
SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.