Rpc Node

RPCNode

WalletAPIServer extends the abstract class RPCNode, so let’s first dig into what RPCNode is:

Class diagram overview 📝

diagram

source code

properties

transport: allows our server to communicate with the webview
- receives message from webview with transport.onMessage being set to this.handleMessage
- sends message to webview with transport.send on error / response.

methods

requests: ignore it, used only by WalletAPIClient
handleMessage: forwards RPC message to handleRequest or handleResponse
- if handleRequest is called, it calls onRequest method of the WalletAPIServer

notify

sends a message to the app using this.transport.send

RPC Requests

packages/core/src/JSONRPC/types.ts

/**
 * A rpc call is represented by sending a Request object to a Server.
 */
type RpcRequest<MParam = string, TParam = unknown> = {
  /**
   * A String specifying the version of the JSON-RPC protocol. **MUST** be exactly "2.0".
   */
  jsonrpc: "2.0";
 
  /**
   * A String containing the name of the method to be invoked.
   */
  method: MParam;
 
  /**
   * A Structured value that holds the parameter values
   * to be used during the invocation of the method.
   */
  params?: TParam;
 
  /**
   * An identifier established by the Client that **MUST** contain a `String`, `Number`,
   * or `NULL` value if included.
   * If it is not included it is assumed to be a notification.
   * The value **SHOULD** normally not be Null and Numbers **SHOULD NOT** contain fractional parts
   */
  id?: string | number | null;
};

Wallet Rxjs