Keep/mcp-server/node_modules/@modelcontextprotocol/sdk/dist/esm/client/websocket.js

import { JSONRPCMessageSchema } from '../types.js';
const SUBPROTOCOL = 'mcp';
/**
 * Client transport for WebSocket: this will connect to a server over the WebSocket protocol.
 */
export class WebSocketClientTransport {
    constructor(url) {
        this._url = url;
    }
    start() {
        if (this._socket) {
            throw new Error('WebSocketClientTransport already started! If using Client class, note that connect() calls start() automatically.');
        }
        return new Promise((resolve, reject) => {
            this._socket = new WebSocket(this._url, SUBPROTOCOL);
            this._socket.onerror = event => {
                const error = 'error' in event ? event.error : new Error(`WebSocket error: ${JSON.stringify(event)}`);
                reject(error);
                this.onerror?.(error);
            };
            this._socket.onopen = () => {
                resolve();
            };
            this._socket.onclose = () => {
                this.onclose?.();
            };
            this._socket.onmessage = (event) => {
                let message;
                try {
                    message = JSONRPCMessageSchema.parse(JSON.parse(event.data));
                }
                catch (error) {
                    this.onerror?.(error);
                    return;
                }
                this.onmessage?.(message);
            };
        });
    }
    async close() {
        this._socket?.close();
    }
    send(message) {
        return new Promise((resolve, reject) => {
            if (!this._socket) {
                reject(new Error('Not connected'));
                return;
            }
            this._socket?.send(JSON.stringify(message));
            resolve();
        });
    }
}
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