NAME

JSON::RPC2::AnyEvent::Server::PSGI - PSGI adapter for JSON::RPC2::AnyEvent::Server

SYNOPSIS

    use JSON::RPC2::AnyEvent::Server::PSGI;
    
    my $srv = JSON::RPC2::AnyEvent::Server->new(
        method => '[arg1, arg2]' => sub{
            my ($cv, $args) = @_;
            do_some_async_task(sub{ $cv->($result) });
        }
    );
    
    $srv->to_psgi_app;  # psgi app

DESCRIPTION

JSON::RPC2::AnyEvent::Server::PSGI is a PSGI adapter for JSON::RPC2::AnyEvent::Server. It converts JSON::RPC2::AnyEvent::Server object to a PSGI app.

USAGE

Just call to_psgi_app method on JSON::RPC2::AnyEvent::Server object:

    my $srv = JSON::RPC2::AnyEvent::Server->new(...);
    my $psgi_app = $srv->to_psgi_app;

That's it!

URL-QUERY MAPPING

While you can send requests as JSON of course, you can also send requests as application/x-www-form-urlencoded format for your convinience. The mapping rule between URL-query to JSON is similar to but slightly different from the rule of JSON-RPC 1.1 Draft.

For example:

    POST /jsonrpc/do_it HTTP/1.1
    Host: example.com
    Content-Type: application/x-www-form-urlencoded
    Content-Length: 11
    
    foo=1&bar=2

This request is equivalent to the below:

    POST /jsonrpc HTTP/1.1
    Host: example.com
    Content-Type: application/json
    Content-Length: 75
    
    {"jsonrpc":"2.0", "id":null, "method":"do_it", "params":{"foo":1, "bar":2}}

Key-value pairs of URL-encoded query is translated into a JSON object (hash) and method to be called is determined by the path-info (extra-path) part in the requested URI.

This module makes special treatment for requests with Content-Type header set to "application/x-www-form-urlencoded".

You can even call RPC by HTTP GET request. The above request is also equivalent to the following:

    GET /jsonrpc/do_it?foo=1&bar=2 HTTP/1.1
    Host: example.com
    

If a key is used multiple times, it is treated as a arrayref. For instance:

    GET /jsonrpc/do_it?foo=1&bar=2&foo=3 HTTP/1.1
    Host: example.com
    

is equivalent to:

    POST /jsonrpc HTTP/1.1
    Host: example.com
    Content-Type: application/json
    Content-Length: 81
    
    {"jsonrpc":"2.0", "id":null, "method":"do_it", "params":{"foo":[1, 3], "bar":2}}

NOTIFICATION

Since JSON-RPC 2.0 spec defines "The Server MUST NOT reply to a Notification, this module does not reply any responses for notification requests, but just returns empty HTTP response (zero-length content body) with status code 200.

Actually, the server returns response as soon as it turns out the response is notification, even when the corresponding server method has not completed the process. It can be an advantege to normal method call requests, because it blocks clients only for short time.

LICENSE

Copyright (C) Daisuke (yet another) Maki.

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

AUTHOR

Daisuke (yet another) Maki <maki.daisuke@gmail.com>

cpanm JSON::RPC2::AnyEvent::Server::PSGI

perl -MCPAN -e shell
install JSON::RPC2::AnyEvent::Server::PSGI