Dancer2::Core::Response::Delayed(3)

NAME
Dancer2::Core::Response::Delayed - Delayed responses

VERSION
version 2.0.0

SYNOPSIS
    my $response = Dancer2::Core::Response::Delayed->new(
        request   => Dancer2::Core::Request->new(...),
        response  => Dancer2::Core::Response->new(...),
        cb        => sub {...},

        # optional error handling
        error_cb  => sub {
            my ($error) = @_;
            ...
        },
    );

    # or in an app
    get '/' => sub {
        # delayed response:
        delayed {
            # streaming content
            content "data";
            content "more data";

            # close user connection
            done;
        } on_error => sub {
            my ($error) = @_;
            warning 'Failed to stream to user: ' . request->remote_address;
        };
    };

DESCRIPTION
This object represents a delayed (asynchronous) response for Dancer2. It can be used via the "delayed" keyword.

It keeps references to a request and a response in order to avoid keeping a reference to the application.

ATTRIBUTES

  request
Contains a request the delayed response uses.

In the context of a web request, this will be the request that existed when the delayed response has been created.

  response
Contains a response the delayed response uses.

In the context of a web request, this will be the response that existed when the delayed response has been created.

  cb
The code that will be run asynchronously.

  error_cb
A callback for handling errors. This callback receives the error as its first (and currently only) parameter.

METHODS

  is_halted
A method indicating whether the response has halted.

This is useless in the context of an asynchronous request so it simply returns no.

This method is likely going away.

  has_passed
A method indicating whether the response asked to skip the current response.

This is useless in the context of an asynchronous request so it simply returns no.

This method is likely going away.

  to_psgi
Create a PSGI response. The way it works is by returning a proper PSGI response subroutine which localizes the request and response (in case the callback wants to edit them without a reference to them), and then calls the callback.

Finally, when the callback is done, it asks the response (whether it was changed or not) to create its own PSGI response (calling "to_psgi") and sends that to the callback it receives as a delayed response.

AUTHOR
Dancer Core Developers

COPYRIGHT AND LICENSE
This software is copyright (c) 2025 by Alexis Sukrieh.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.