clickhouse-mcp/dist/test-clickhouse.js

An MCP server for ClickHouse in TypeScript

// test-clickhouse.ts
import { createClient } from "@clickhouse/client";
async function testClickHouseConnection() {
    console.error("Starting ClickHouse connection test..."); // Using console.error to see in logs
    try {
        // Get config from environment variables
        const host = "localhost";
        const port = "8123";
        const secure = "false";
        const protocol = "http";
        const url = `${protocol}://${host}:${port}`;
        console.error(`Connecting to ClickHouse at ${url}`);
        const client = createClient({
            host: url,
            username: "default",
            password: "clickhouse",
            request_timeout: 30000,
        });
        console.error("Executing test query...");
        const result = await client.query({
            query: "SELECT 1 as test",
            format: "JSONEachRow",
        });
        const data = await result.json();
        console.error("Query successful, result:", JSON.stringify(data));
        // Test database listing
        console.error("Listing databases...");
        const dbResult = await client.query({
            query: "SHOW DATABASES",
            format: "JSONEachRow",
        });
        const databases = await dbResult.json();
        console.error("Databases:", JSON.stringify(databases));
        return true; // Connection successful
    }
    catch (error) {
        console.error("ClickHouse connection error:", error.message);
        if (error instanceof Error) {
            console.error("Error stack:", error.stack);
        }
        return false; // Connection failed
    }
}
// Main function to handle command
async function main() {
    const command = process.argv[2];
    if (command === "start") {
        const success = await testClickHouseConnection();
        console.error(`Connection test ${success ? "succeeded" : "failed"}`);
    }
    else {
        console.error("Unknown command. Use 'start' to test connection.");
    }
}
main().catch(err => {
    console.error("Unhandled error:", err);
    process.exit(1);
});
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