Google Cloud MCP Server

Implementation Reference

• src/services/spanner/query-count.ts:96-264 (handler)

  The core handler function for the 'gcp-spanner-query-count' tool. It uses Google Cloud Monitoring API to fetch query_count metrics for Spanner, applies filters based on input params, aggregates data, and returns formatted Markdown tables with timestamps and counts.
  async ( { instanceId, databaseId, queryType, status, startTime, endTime, alignmentPeriod, }, context, ) => { try { const projectId = await getProjectId(); const client = new MetricServiceClient({ projectId: process.env.GOOGLE_CLOUD_PROJECT, }); // Parse time range const start = parseRelativeTime(startTime); const end = endTime ? parseRelativeTime(endTime) : new Date(); // Build filter for the metric let filter = 'metric.type = "spanner.googleapis.com/query_count"'; // Add resource filters if specified if (instanceId) { filter += ` AND resource.labels.instance_id = "${instanceId}"`; } // Add metric label filters if (databaseId) { filter += ` AND metric.labels.database = "${databaseId}"`; } if (queryType !== "ALL") { filter += ` AND metric.labels.query_type = "${queryType.toLowerCase()}"`; } if (status !== "ALL") { filter += ` AND metric.labels.status = "${status.toLowerCase()}"`; } // Parse alignment period (e.g., "60s" -> 60 seconds) const match = alignmentPeriod.match(/^(\d+)([smhd])$/); if (!match) { throw new GcpMcpError( 'Invalid alignment period format. Use format like "60s", "5m", "1h".', "INVALID_ARGUMENT", 400, ); } const value = parseInt(match[1]); const unit = match[2]; let seconds = value; switch (unit) { case "m": // minutes seconds = value * 60; break; case "h": // hours seconds = value * 60 * 60; break; case "d": // days seconds = value * 60 * 60 * 24; break; } // Build the request const request = { name: `projects/${projectId}`, filter, interval: { startTime: { seconds: Math.floor(start.getTime() / 1000), nanos: 0, }, endTime: { seconds: Math.floor(end.getTime() / 1000), nanos: 0, }, }, aggregation: { alignmentPeriod: { seconds, }, perSeriesAligner: "ALIGN_SUM", crossSeriesReducer: "REDUCE_SUM", }, }; // Execute the request const timeSeriesData = await client.listTimeSeries(request as any); const timeSeries = timeSeriesData[0]; if (!timeSeries || timeSeries.length === 0) { return { content: [ { type: "text", text: `# Spanner Query Count\n\nProject: ${projectId}\n${instanceId ? `\nInstance: ${instanceId}` : ""}\n${databaseId ? `\nDatabase: ${databaseId}` : ""}\n\nQuery Type: ${queryType}\nStatus: ${status}\nTime Range: ${start.toISOString()} to ${end.toISOString()}\nAlignment Period: ${alignmentPeriod}\n\nNo query count data found for the specified parameters.`, }, ], }; } // Format the results let markdown = `# Spanner Query Count\n\nProject: ${projectId}\n${instanceId ? `\nInstance: ${instanceId}` : ""}\n${databaseId ? `\nDatabase: ${databaseId}` : ""}\n\nQuery Type: ${queryType}\nStatus: ${status}\nTime Range: ${start.toISOString()} to ${end.toISOString()}\nAlignment Period: ${alignmentPeriod}\n\n`; // Create a table for each time series for (const series of timeSeries) { const seriesData = series as unknown as TimeSeriesData; // Extract labels for the table header const instanceName = seriesData.resource.labels.instance_id || "unknown"; const databaseName = seriesData.metric.labels?.database || "all"; const queryTypeValue = seriesData.metric.labels?.query_type || "all"; const statusValue = seriesData.metric.labels?.status || "all"; const optimizerVersion = seriesData.metric.labels?.optimizer_version || "unknown"; markdown += `## Instance: ${instanceName}, Database: ${databaseName}\n`; markdown += `Query Type: ${queryTypeValue}, Status: ${statusValue}, Optimizer Version: ${optimizerVersion}\n\n`; // Table header markdown += "| Timestamp | Query Count |\n"; markdown += "|-----------|------------|\n"; // Table rows if (seriesData.points && seriesData.points.length > 0) { // Sort points by time (oldest first) const sortedPoints = [...seriesData.points].sort((a, b) => { const aTime = Number(a.interval.startTime.seconds); const bTime = Number(b.interval.startTime.seconds); return aTime - bTime; }); for (const point of sortedPoints) { const timestamp = new Date( Number(point.interval.endTime.seconds) * 1000, ).toISOString(); const count = point.value.int64Value || "0"; markdown += `| ${timestamp} | ${count} |\n`; } } else { markdown += "| No data | 0 |\n"; } markdown += "\n"; } return { content: [ { type: "text", text: markdown, }, ], }; } catch (error: any) { logger.error( `Error in spanner-query-count tool: ${error instanceof Error ? error.message : String(error)}`, ); throw error; } },
• src/services/spanner/query-count.ts:60-95 (schema)

  Input schema using Zod for validating tool parameters including optional instanceId and databaseId, queryType and status enums, time range strings, and alignment period.
  { instanceId: z .string() .optional() .describe( "Spanner instance ID (optional, if not provided will show all instances)", ), databaseId: z .string() .optional() .describe( "Spanner database ID (optional, if not provided will show all databases)", ), queryType: z .enum(["ALL", "READ", "QUERY"]) .default("ALL") .describe("Type of queries to count (ALL, READ, QUERY)"), status: z .enum(["ALL", "OK", "ERROR"]) .default("ALL") .describe("Status of queries to count (ALL, OK, ERROR)"), startTime: z .string() .default("1h") .describe('Start time for the query (e.g., "1h", "2d", "30m")'), endTime: z .string() .optional() .describe("End time for the query (defaults to now)"), alignmentPeriod: z .string() .default("60s") .describe( 'Alignment period for aggregating data points (e.g., "60s", "5m", "1h")', ), },
• src/services/spanner/query-count.ts:57-266 (registration)

  The registration function that calls server.tool() to register the 'gcp-spanner-query-count' tool with its schema and handler on the MCP server.
  export function registerSpannerQueryCountTool(server: McpServer): void { server.tool( "gcp-spanner-query-count", { instanceId: z .string() .optional() .describe( "Spanner instance ID (optional, if not provided will show all instances)", ), databaseId: z .string() .optional() .describe( "Spanner database ID (optional, if not provided will show all databases)", ), queryType: z .enum(["ALL", "READ", "QUERY"]) .default("ALL") .describe("Type of queries to count (ALL, READ, QUERY)"), status: z .enum(["ALL", "OK", "ERROR"]) .default("ALL") .describe("Status of queries to count (ALL, OK, ERROR)"), startTime: z .string() .default("1h") .describe('Start time for the query (e.g., "1h", "2d", "30m")'), endTime: z .string() .optional() .describe("End time for the query (defaults to now)"), alignmentPeriod: z .string() .default("60s") .describe( 'Alignment period for aggregating data points (e.g., "60s", "5m", "1h")', ), }, async ( { instanceId, databaseId, queryType, status, startTime, endTime, alignmentPeriod, }, context, ) => { try { const projectId = await getProjectId(); const client = new MetricServiceClient({ projectId: process.env.GOOGLE_CLOUD_PROJECT, }); // Parse time range const start = parseRelativeTime(startTime); const end = endTime ? parseRelativeTime(endTime) : new Date(); // Build filter for the metric let filter = 'metric.type = "spanner.googleapis.com/query_count"'; // Add resource filters if specified if (instanceId) { filter += ` AND resource.labels.instance_id = "${instanceId}"`; } // Add metric label filters if (databaseId) { filter += ` AND metric.labels.database = "${databaseId}"`; } if (queryType !== "ALL") { filter += ` AND metric.labels.query_type = "${queryType.toLowerCase()}"`; } if (status !== "ALL") { filter += ` AND metric.labels.status = "${status.toLowerCase()}"`; } // Parse alignment period (e.g., "60s" -> 60 seconds) const match = alignmentPeriod.match(/^(\d+)([smhd])$/); if (!match) { throw new GcpMcpError( 'Invalid alignment period format. Use format like "60s", "5m", "1h".', "INVALID_ARGUMENT", 400, ); } const value = parseInt(match[1]); const unit = match[2]; let seconds = value; switch (unit) { case "m": // minutes seconds = value * 60; break; case "h": // hours seconds = value * 60 * 60; break; case "d": // days seconds = value * 60 * 60 * 24; break; } // Build the request const request = { name: `projects/${projectId}`, filter, interval: { startTime: { seconds: Math.floor(start.getTime() / 1000), nanos: 0, }, endTime: { seconds: Math.floor(end.getTime() / 1000), nanos: 0, }, }, aggregation: { alignmentPeriod: { seconds, }, perSeriesAligner: "ALIGN_SUM", crossSeriesReducer: "REDUCE_SUM", }, }; // Execute the request const timeSeriesData = await client.listTimeSeries(request as any); const timeSeries = timeSeriesData[0]; if (!timeSeries || timeSeries.length === 0) { return { content: [ { type: "text", text: `# Spanner Query Count\n\nProject: ${projectId}\n${instanceId ? `\nInstance: ${instanceId}` : ""}\n${databaseId ? `\nDatabase: ${databaseId}` : ""}\n\nQuery Type: ${queryType}\nStatus: ${status}\nTime Range: ${start.toISOString()} to ${end.toISOString()}\nAlignment Period: ${alignmentPeriod}\n\nNo query count data found for the specified parameters.`, }, ], }; } // Format the results let markdown = `# Spanner Query Count\n\nProject: ${projectId}\n${instanceId ? `\nInstance: ${instanceId}` : ""}\n${databaseId ? `\nDatabase: ${databaseId}` : ""}\n\nQuery Type: ${queryType}\nStatus: ${status}\nTime Range: ${start.toISOString()} to ${end.toISOString()}\nAlignment Period: ${alignmentPeriod}\n\n`; // Create a table for each time series for (const series of timeSeries) { const seriesData = series as unknown as TimeSeriesData; // Extract labels for the table header const instanceName = seriesData.resource.labels.instance_id || "unknown"; const databaseName = seriesData.metric.labels?.database || "all"; const queryTypeValue = seriesData.metric.labels?.query_type || "all"; const statusValue = seriesData.metric.labels?.status || "all"; const optimizerVersion = seriesData.metric.labels?.optimizer_version || "unknown"; markdown += `## Instance: ${instanceName}, Database: ${databaseName}\n`; markdown += `Query Type: ${queryTypeValue}, Status: ${statusValue}, Optimizer Version: ${optimizerVersion}\n\n`; // Table header markdown += "| Timestamp | Query Count |\n"; markdown += "|-----------|------------|\n"; // Table rows if (seriesData.points && seriesData.points.length > 0) { // Sort points by time (oldest first) const sortedPoints = [...seriesData.points].sort((a, b) => { const aTime = Number(a.interval.startTime.seconds); const bTime = Number(b.interval.startTime.seconds); return aTime - bTime; }); for (const point of sortedPoints) { const timestamp = new Date( Number(point.interval.endTime.seconds) * 1000, ).toISOString(); const count = point.value.int64Value || "0"; markdown += `| ${timestamp} | ${count} |\n`; } } else { markdown += "| No data | 0 |\n"; } markdown += "\n"; } return { content: [ { type: "text", text: markdown, }, ], }; } catch (error: any) { logger.error( `Error in spanner-query-count tool: ${error instanceof Error ? error.message : String(error)}`, ); throw error; } }, ); }
• src/index.ts:171-171 (registration)

  The point where registerSpannerQueryCountTool is invoked during main server initialization to register the tool.
  registerSpannerQueryCountTool(server);