p6-Crust

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PSGI library stack for Perl6

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NAME
====

Crust - Perl6 Superglue for Web frameworks and Web Servers

DESCRIPTION
===========

Crust is a set of tools for using the P6W stack. It contains middleware components, and utilities for Web application frameworks. Crust is like Perl5's Plack, Ruby's Rack, Python's Paste for WSGI.

See [P6W](https://github.com/zostay/P6W) for the P6W (former known as P6SGI) specification.

MODULES AND UTILITIES
=====================

Crust::Handler
--------------

Crust::Handler and its subclasses contains adapters for web servers. We have adapters for the built-in standalone web server HTTP::Easy::PSGI, and HTTP::Server::Tiny included in the core Crust distribution.

See [Crust::Handler](Crust::Handler) when writing your own adapters.

Crust::Middleware
-----------------

P6W middleware is a P6W application that wraps an existing P6W application and plays both side of application and servers. From the servers the wrapped code reference still looks like and behaves exactly the same as P6W applications.

Crust::Request, Crust::Response
-------------------------------

Crust::Request gives you a nice wrapper API around P6W $env hash to get headers, cookies and query parameters much like Apache::Request in mod_perl.

Crust::Response does the same to construct the response array reference.

.p6w files
----------

A P6W application is a code reference but it's not easy to pass code reference via the command line or configuration files, so Crust uses a convention that you need a file named "app.p6w" or similar, which would be loaded (via perl6's core function "EVALFILE") to return the P6W application code reference.

# Hello.p6w
    my $app = sub ($env) {
        # ...
        return $status, $headers, $body;
    };

If you use a web framework, chances are that they provide a helper utility to automatically generate these ".p6w" files for you, such as:

# MyApp.p6w
    use MyApp;
    my $app = sub { MyApp->run_p6w(@_) };

It's important that the return value of ".p6w" file is the code reference. See "eg/" directory for more examples of ".p6w" files.

An Alternative to .p6w files
============================

As an alternative to using EVAL, you can take advantage of Perl's Callable type which will return a code reference as well, making Crust happy.

Here is an example of an implmentation using a Callable class in place of any .p6w files and having to call a "crustup" script. You can call this directly from the command line, just like you would "crustup".

use v6;

use Crust::Runner;

class MyApp does Callable
    {
        has $.status  is rw;
        has @.headers is rw;
        has @.body    is rw;

method CALL-ME(%env) {
            self.call(%env);
        }

method call(%env) {

$.status  = 200;
            @.headers = [ 'Content-Type' => 'text/html' ];
            @.body    = [ '<html><head><title>Hi</title></head>',
                          '<body>I just want you to see me</body>',
                          '</html>',
                        ];

return $.status, @.headers, @.body;
        }
    }

my $runner = Crust::Runner.new;
    $runner.parse-options(@*ARGS);
    $runner.run(MyApp.new);

AUTHORS
=======

* Tokuhiro Matsuno

* mattn

* Shoichi Kaji

* Daisuke Maki

* moznion

* Kentaro Kuribayashi

* Tim Smith

* fayland

INSTALL AND TEST
================

Install dependencies with

zef install --deps-only .
	
And then test with

prove -Ilib --exec "perl6 -Ilib" -r t
	
(provided `prove` is installed via Perl5's `Test::Harness`)

Or better

zef test .
	
(this will use available test facilities, including the one above)

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.

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