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| 1 | +import { exec } from "child_process"; |
| 2 | +import { promisify } from "util"; |
| 3 | +import * as net from "net"; |
| 4 | +import { z } from "zod"; |
| 5 | +import { CallToolResult } from "@modelcontextprotocol/sdk/types.js"; |
| 6 | +import { LocalToolBase } from "../localTool.js"; |
| 7 | +import { ToolArgs, OperationType } from "../../tool.js"; |
| 8 | + |
| 9 | +export class CreateClusterTool extends LocalToolBase { |
| 10 | + protected name = "local-create-cluster"; |
| 11 | + protected description = "Create a new local MongoDB cluster"; |
| 12 | + protected operationType: OperationType = "create"; |
| 13 | + protected argsShape = { |
| 14 | + name: z.string().describe("Name of the cluster"), |
| 15 | + port: z.number().describe("The port number on which the local MongoDB cluster will run.").optional(), |
| 16 | + }; |
| 17 | + |
| 18 | + protected async execute({ name, port }: ToolArgs<typeof this.argsShape>): Promise<CallToolResult> { |
| 19 | + const availablePort = await this.getAvailablePort(port); |
| 20 | + const result = await this.createCluster(name, availablePort); |
| 21 | + return this.formatCreateClusterResult(result); |
| 22 | + } |
| 23 | + |
| 24 | + private async getAvailablePort(port?: number): Promise<number> { |
| 25 | + if (port) { |
| 26 | + const isAvailable = await this.isPortAvailable(port); |
| 27 | + if (!isAvailable) { |
| 28 | + throw new Error(`Port ${port} is already in use. Please specify a different port.`); |
| 29 | + } |
| 30 | + return port; |
| 31 | + } |
| 32 | + |
| 33 | + // Find a random available port |
| 34 | + return new Promise((resolve, reject) => { |
| 35 | + const server = net.createServer(); |
| 36 | + server.listen(0, () => { |
| 37 | + const address = server.address(); |
| 38 | + if (typeof address === "object" && address?.port) { |
| 39 | + const randomPort = address.port; |
| 40 | + server.close(() => resolve(randomPort)); |
| 41 | + } else { |
| 42 | + reject(new Error("Failed to find an available port.")); |
| 43 | + } |
| 44 | + }); |
| 45 | + server.on("error", reject); |
| 46 | + }); |
| 47 | + } |
| 48 | + |
| 49 | + private async isPortAvailable(port: number): Promise<boolean> { |
| 50 | + return new Promise((resolve) => { |
| 51 | + const server = net.createServer(); |
| 52 | + server.once("error", () => resolve(false)); // Port is in use |
| 53 | + server.once("listening", () => { |
| 54 | + server.close(() => resolve(true)); // Port is available |
| 55 | + }); |
| 56 | + server.listen(port); |
| 57 | + }); |
| 58 | + } |
| 59 | + |
| 60 | + private async createCluster(clusterName: string, port: number): Promise<{ success: boolean; message: string }> { |
| 61 | + const execAsync = promisify(exec); |
| 62 | + |
| 63 | + try { |
| 64 | + // Run the Docker command to create a new MongoDB container |
| 65 | + await execAsync(`docker run -d --name ${clusterName} -p ${port}:27017 mongodb/mongodb-atlas-local:8.0`); |
| 66 | + |
| 67 | + return { |
| 68 | + success: true, |
| 69 | + message: `Cluster "${clusterName}" created successfully on port ${port}.`, |
| 70 | + }; |
| 71 | + } catch (error) { |
| 72 | + if (error instanceof Error) { |
| 73 | + return { |
| 74 | + success: false, |
| 75 | + message: `Failed to create cluster "${clusterName}": ${error.message}`, |
| 76 | + }; |
| 77 | + } else { |
| 78 | + return { |
| 79 | + success: false, |
| 80 | + message: `An unexpected error occurred while creating cluster "${clusterName}".`, |
| 81 | + }; |
| 82 | + } |
| 83 | + } |
| 84 | + } |
| 85 | + |
| 86 | + private formatCreateClusterResult(result: { success: boolean; message: string }): CallToolResult { |
| 87 | + return { |
| 88 | + content: [ |
| 89 | + { |
| 90 | + type: "text", |
| 91 | + text: result.message, |
| 92 | + }, |
| 93 | + ], |
| 94 | + }; |
| 95 | + } |
| 96 | +} |
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