1Frontier::Responder(3)User Contributed Perl DocumentationFrontier::Responder(3)
2
3
4

NAME

6       Frontier::Responder - Create XML-RPC listeners for normal CGI processes
7

SYNOPSIS

9        use Frontier::Responder;
10        my $res = Frontier::Responder->new( methods => {
11                                                        add => sub{ $_[0] + $_[1] },
12                                                        cat => sub{ $_[0] . $_[1] },
13                                                       },
14                                           );
15        print $res->answer;
16

DESCRIPTION

18       Use Frontier::Responder whenever you need to create an XML-RPC listener
19       using a standard CGI interface. To be effective, a script using this
20       class will often have to be put a directory from which a web server is
21       authorized to execute CGI programs. An XML-RPC listener using this
22       library will be implementing the API of a particular XML-RPC
23       application. Each remote procedure listed in the API of the user
24       defined application will correspond to a hash key that is defined in
25       the "new" method of a Frontier::Responder object. This is exactly the
26       way Frontier::Daemon works as well.  In order to process the request
27       and get the response, the "answer" method is needed. Its return value
28       is XML ready for printing.
29
30       For those new to XML-RPC, here is a brief description of this protocol.
31       XML-RPC is a way to execute functions on a different machine. Both the
32       client's request and listeners response are wrapped up in XML and sent
33       over HTTP. Because the XML-RPC conversation is in XML, the
34       implementation languages of the server (here called a listener), and
35       the client can be different. This can be a powerful and simple way to
36       have very different platforms work together without acrimony. Implicit
37       in the use of XML-RPC is a contract or API that an XML-RPC listener
38       implements and an XML-RPC client calls. The API needs to list not only
39       the various procedures that can be called, but also the XML-RPC
40       datatypes expected for input and output. Remember that although Perl is
41       permissive about datatyping, other languages are not. Unforuntately,
42       the XML-RPC spec doesn't say how to document the API. It is recomended
43       that the author of a Perl XML-RPC listener should at least use POD to
44       explain the API.  This allows for the programmatic generation of a
45       clean web page.
46

METHODS

48       new( OPTIONS )
49           This is the class constructor. As is traditional, it returns a
50           blessed reference to a Frontier::Responder object. It expects
51           arguments to be given like a hash (Perl's named parameter
52           mechanism).  To be effective, populate the "methods" parameter with
53           a hashref that has API procedure names as keys and subroutine
54           references as values. See the SYNOPSIS for a sample usage.
55
56       answer()
57           In order to parse the request and execute the procedure, this
58           method must be called. It returns a XML string that contains the
59           procedure's response. In a typical CGI program, this string will
60           simply be printed to STDOUT.
61

SEE ALSO

63       perl(1), Frontier::RPC2(3)
64
65       <http://www.scripting.com/frontier5/xml/code/rpc.html>
66

AUTHOR

68       Ken MacLeod <ken@bitsko.slc.ut.us> wrote the underlying RPC library.
69
70       Joe Johnston <jjohn@cs.umb.edu> wrote an adaptation of the
71       Frontier::Daemon class to create this CGI XML-RPC listener class.
72
73
74
75perl v5.30.1                      2020-01-30            Frontier::Responder(3)
Impressum