openethereum/js/packages/api/transport/middleware.js

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
export default class Middleware {
constructor (transport) {
this._transport = transport;
this._handlers = {};
}
register (method, handler) {
if (method in this._handlers) {
throw new Error(`${method} is already defined in the middleware!`);
}
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this._handlers[method] = handler;
}
handle (method, params) {
const handler = this._handlers[method];
if (handler != null) {
return handler(params);
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}
return null;
}
rpcRequest (method, params) {
return this._transport._execute(method, params);
}
}