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JSONRPC

Inherits: Object

A helper to handle dictionaries which look like JSONRPC documents.

Description

JSON-RPC is a standard which wraps a method call in a JSON object. The object has a particular structure and identifies which method is called, the parameters to that function, and carries an ID to keep track of responses. This class implements that standard on top of Dictionary; you will have to convert between a Dictionary and JSON with other functions.

Methods

Dictionary

make_notification ( String method, Variant params )

Dictionary

make_request ( String method, Variant params, Variant id )

Dictionary

make_response ( Variant result, Variant id )

Dictionary

make_response_error ( int code, String message, Variant id=null ) const

Variant

process_action ( Variant action, bool recurse=false )

String

process_string ( String action )

void

set_scope ( String scope, Object target )

Enumerations

enum ErrorCode:

ErrorCode PARSE_ERROR = -32700

ErrorCode INVALID_REQUEST = -32600

ErrorCode METHOD_NOT_FOUND = -32601

A method call was requested but no function of that name existed in the JSONRPC subclass.

ErrorCode INVALID_PARAMS = -32602

ErrorCode INTERNAL_ERROR = -32603

Method Descriptions

Dictionary make_notification ( String method, Variant params )

Returns a dictionary in the form of a JSON-RPC notification. Notifications are one-shot messages which do not expect a response.

  • method: Name of the method being called.

  • params: An array or dictionary of parameters being passed to the method.

Dictionary make_request ( String method, Variant params, Variant id )

Returns a dictionary in the form of a JSON-RPC request. Requests are sent to a server with the expectation of a response. The ID field is used for the server to specify which exact request it is responding to.

  • method: Name of the method being called.

  • params: An array or dictionary of parameters being passed to the method.

  • id: Uniquely identifies this request. The server is expected to send a response with the same ID.

Dictionary make_response ( Variant result, Variant id )

When a server has received and processed a request, it is expected to send a response. If you did not want a response then you need to have sent a Notification instead.

  • result: The return value of the function which was called.

  • id: The ID of the request this response is targeted to.

Dictionary make_response_error ( int code, String message, Variant id=null ) const

Creates a response which indicates a previous reply has failed in some way.

  • code: The error code corresponding to what kind of error this is. See the ErrorCode constants.

  • message: A custom message about this error.

  • id: The request this error is a response to.

Variant process_action ( Variant action, bool recurse=false )

Given a Dictionary which takes the form of a JSON-RPC request: unpack the request and run it. Methods are resolved by looking at the field called “method” and looking for an equivalently named function in the JSONRPC object. If one is found that method is called.

To add new supported methods extend the JSONRPC class and call process_action on your subclass.

action: The action to be run, as a Dictionary in the form of a JSON-RPC request or notification.

String process_string ( String action )

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void set_scope ( String scope, Object target )

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