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Frontier::RPC2 - encode/decode RPC2 format XML


use Frontier::RPC2;
$coder = Frontier::RPC2->new;
$xml_string = $coder->encode_call($method, @args);
$xml_string = $coder->encode_response($result);
$xml_string = $coder->encode_fault($code, $message);
$call = $coder->decode($xml_string);
$response_xml = $coder->serve($request_xml, $methods);
$boolean_object = $coder->boolean($boolean);
$date_time_object = $coder->date_time($date_time);
$base64_object = $coder->base64($base64);
$int_object = $coder->int(42);
$float_object = $coder->float(3.14159);
$string_object = $coder->string("Foo");


Frontier::RPC2 encodes and decodes XML RPC calls.
$coder = Frontier::RPC2->new( OPTIONS )

Create a new encoder/decoder. The following option is supported:

The XML encoding to be specified in the XML declaration of encoded RPC requests or responses. Decoded results may have a different encoding specified; XML::Parser will convert decoded data to UTF-8. The default encoding is none, which uses XML 1.0 ’s default of UTF-8. For example:

$server = Frontier::RPC2->new( 'encoding' => 'ISO-8859-1' );


If set to a non-zero value will convert incoming <i4>, <float>, and <string> values to objects instead of scalars. See int(), float(), and string() below for more details.

$xml_string = $coder->encode_call($method, @args)

’"encode_call"’ converts a method name and it’s arguments into an RPC2 ’"methodCall"’ element, returning the XML fragment.

$xml_string = $coder->encode_response($result)

’"encode_response"’ converts the return value of a procedure into an RPC2 ’"methodResponse"’ element containing the result, returning the XML fragment.

$xml_string = $coder->encode_fault($code, $message)

’"encode_fault"’ converts a fault code and message into an RPC2 ’"methodResponse"’ element containing a ’"fault"’ element, returning the XML fragment.

$call = $coder->decode($xml_string)

’"decode"’ converts an XML string containing an RPC2 ’"methodCall"’ or ’"methodResponse"’ element into a hash containing three members, ’"type"’, ’"value"’, and ’"method_name"’. ’"type"’ is one of ’"call"’, ’"response"’, or ’"fault"’. ’"value"’ is array containing the parameters or result of the RPC. For a ’"call"’ type, ’"value"’ contains call’s parameters and ’"method_name"’ contains the method being called. For a ’"response"’ type, the ’"value"’ array contains call’s result. For a ’"fault"’ type, the ’"value"’ array contains a hash with the two members ’"faultCode"’ and ’"faultMessage"’.

$response_xml = $coder->serve($request_xml, $methods)

’"serve"’ decodes ’$request_xml’, looks up the called method name in the ’$methods’ hash and calls it, and then encodes and returns the response as XML.

$boolean_object = $coder->boolean($boolean);
$date_time_object = $coder->date_time($date_time);
$base64_object = $coder->base64($base64);

These methods create and return XML-RPC-specific datatypes that can be passed to the encoder. The decoder may also return these datatypes. The corresponding package names (for use with ’"ref()"’, for example) are ’"Frontier::RPC2::Boolean"’, ’"Frontier::RPC2::DateTime::ISO8601"’, and ’"Frontier::RPC2::Base64"’.

You can change and retrieve the value of boolean, date/time, and base64 data using the ’"value"’ method of those objects, i.e.:

$boolean = $boolean_object->value;

Note: ’"base64()"’ does not encode or decode base64 data for you, you must use MIME::Base64 or similar module for that.

$int_object = $coder->int(42);
$float_object = $coder->float(3.14159);
$string_object = $coder->string("Foo");

By default, you may pass ordinary Perl values (scalars) to be encoded. RPC2 automatically converts them to XML-RPC types if they look like an integer, float, or as a string. This assumption causes problems when you want to pass a string that looks like "0096", RPC2 will convert that to an <i4> because it looks like an integer. With these methods, you could now create a string object like this:

$part_num = $coder->string("0096");

and be confident that it will be passed as an XML-RPC string. You can change and retrieve values from objects using value() as described above.


perl(1), Frontier::Daemon(3), Frontier::Client(3)



Ken MacLeod <ken AT bitsko DOT slc DOT ut DOT us>