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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { ideContext, IdeContextNotificationSchema } from '../ide/ideContext.js';
import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js';
const logger = {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
debug: (...args: any[]) => console.debug('[DEBUG] [IDEClient]', ...args),
};
export type IDEConnectionState = {
status: IDEConnectionStatus;
details?: string; // User-facing
};
export enum IDEConnectionStatus {
Connected = 'connected',
Disconnected = 'disconnected',
Connecting = 'connecting',
}
/**
* Manages the connection to and interaction with the IDE server.
*/
export class IdeClient {
client: Client | undefined = undefined;
private state: IDEConnectionState = {
status: IDEConnectionStatus.Disconnected,
};
constructor() {
this.init().catch((err) => {
logger.debug('Failed to initialize IdeClient:', err);
});
}
getConnectionStatus(): IDEConnectionState {
return this.state;
}
private setState(status: IDEConnectionStatus, details?: string) {
this.state = { status, details };
if (status === IDEConnectionStatus.Disconnected) {
logger.debug('IDE integration is disconnected. ', details);
ideContext.clearIdeContext();
}
}
private getPortFromEnv(): string | undefined {
const port = process.env['GEMINI_CLI_IDE_SERVER_PORT'];
if (!port) {
this.setState(
IDEConnectionStatus.Disconnected,
'Gemini CLI Companion extension not found. Install via /ide install and restart the CLI in a fresh terminal window.',
);
return undefined;
}
return port;
}
private validateWorkspacePath(): boolean {
const ideWorkspacePath = process.env['GEMINI_CLI_IDE_WORKSPACE_PATH'];
if (!ideWorkspacePath) {
this.setState(
IDEConnectionStatus.Disconnected,
'IDE integration requires a single workspace folder to be open in the IDE. Please ensure one folder is open and try again.',
);
return false;
}
if (ideWorkspacePath !== process.cwd()) {
this.setState(
IDEConnectionStatus.Disconnected,
`Gemini CLI is running in a different directory (${process.cwd()}) from the IDE's open workspace (${ideWorkspacePath}). Please run Gemini CLI in the same directory.`,
);
return false;
}
return true;
}
private registerClientHandlers() {
if (!this.client) {
return;
}
this.client.setNotificationHandler(
IdeContextNotificationSchema,
(notification) => {
ideContext.setIdeContext(notification.params);
},
);
this.client.onerror = (_error) => {
this.setState(IDEConnectionStatus.Disconnected, 'Client error.');
};
this.client.onclose = () => {
this.setState(IDEConnectionStatus.Disconnected, 'Connection closed.');
};
}
private async establishConnection(port: string) {
let transport: StreamableHTTPClientTransport | undefined;
try {
this.client = new Client({
name: 'streamable-http-client',
// TODO(#3487): use the CLI version here.
version: '1.0.0',
});
transport = new StreamableHTTPClientTransport(
new URL(`http://localhost:${port}/mcp`),
);
this.registerClientHandlers();
await this.client.connect(transport);
this.setState(IDEConnectionStatus.Connected);
} catch (error) {
this.setState(
IDEConnectionStatus.Disconnected,
`Failed to connect to IDE server: ${error}`,
);
if (transport) {
try {
await transport.close();
} catch (closeError) {
logger.debug('Failed to close transport:', closeError);
}
}
}
}
async init(): Promise<void> {
if (this.state.status === IDEConnectionStatus.Connected) {
return;
}
this.setState(IDEConnectionStatus.Connecting);
if (!this.validateWorkspacePath()) {
return;
}
const port = this.getPortFromEnv();
if (!port) {
return;
}
await this.establishConnection(port);
}
}
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