browserServerBackend.ts•3.31 kB
/**
* Copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { fileURLToPath } from 'url';
import { FullConfig } from './config.js';
import { Context } from './context.js';
import { logUnhandledError } from './utils/log.js';
import { Response } from './response.js';
import { SessionLog } from './sessionLog.js';
import { filteredTools } from './tools.js';
import { toMcpTool } from './mcp/tool.js';
import type { Tool } from './tools/tool.js';
import type { BrowserContextFactory } from './browserContextFactory.js';
import type * as mcpServer from './mcp/server.js';
import type { ServerBackend } from './mcp/server.js';
export class BrowserServerBackend implements ServerBackend {
private _tools: Tool[];
private _context: Context | undefined;
private _sessionLog: SessionLog | undefined;
private _config: FullConfig;
private _browserContextFactory: BrowserContextFactory;
constructor(config: FullConfig, factory: BrowserContextFactory) {
this._config = config;
this._browserContextFactory = factory;
this._tools = filteredTools(config);
}
async initialize(server: mcpServer.Server, clientVersion: mcpServer.ClientVersion, roots: mcpServer.Root[]): Promise<void> {
let rootPath: string | undefined;
if (roots.length > 0) {
const firstRootUri = roots[0]?.uri;
const url = firstRootUri ? new URL(firstRootUri) : undefined;
rootPath = url ? fileURLToPath(url) : undefined;
}
this._sessionLog = this._config.saveSession ? await SessionLog.create(this._config, rootPath) : undefined;
this._context = new Context({
tools: this._tools,
config: this._config,
browserContextFactory: this._browserContextFactory,
sessionLog: this._sessionLog,
clientInfo: { ...clientVersion, rootPath },
});
}
async listTools(): Promise<mcpServer.Tool[]> {
return this._tools.map(tool => toMcpTool(tool.schema));
}
async callTool(name: string, rawArguments: mcpServer.CallToolRequest['params']['arguments']) {
const tool = this._tools.find(tool => tool.schema.name === name)!;
if (!tool)
throw new Error(`Tool "${name}" not found`);
const parsedArguments = tool.schema.inputSchema.parse(rawArguments || {});
const context = this._context!;
const response = new Response(context, name, parsedArguments);
context.setRunningTool(name);
try {
await tool.handle(context, parsedArguments, response);
await response.finish();
this._sessionLog?.logResponse(response);
} catch (error: any) {
response.addError(String(error));
} finally {
context.setRunningTool(undefined);
}
return response.serialize();
}
serverClosed() {
void this._context?.dispose().catch(logUnhandledError);
}
}