In the current PHP backend for JSON-RPC methods get an extra argument
for returning an error in case of problems. See the sample "test" class
method "echo":
function method_echo($params, $error)
{
if (count($params) != 1)
{
$error->SetError(JsonRpcError_ParameterMismatch,
"Expected 1 parameter; got " . count($params));
return $error;
}
return "Client said: [" . $params[0] . "]";
}
Methods would be more intuitive with just the expected $params argument,
and signaling errors by throwing an exception. This can be done in PHP
5. The method would be like this (I implemented it and works):
function method_echo($params)
{
if (count($params) != 1)
throw new Exception("Expected 1 parameter; got " . count($params),
JsonRpcError_ParameterMismatch);
return "Client said: [" . $params[0] . "]";
}
For it to work it needs a little change in the RPC backend script
"index.php" in order to include try/catch blocks (at the end, when the
method is actually called and checked for errors:
try {
$output = $service->$method($jsonInput->params);
}
catch(Exception $e)
{
$error->SetError($e->getCode(), $e->getMessage());
$error->SendAndExit();
}
I think this makes things simpler and more intuitive.
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