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Enhanced SQL connection monitoring and diagnostics - Added detailed database status monitoring with retry functionality - Improved error handling and logging for SQL connections - Updated UI with connection status indicators and error banners

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DeNNiiInc
2025-12-20 15:50:34 +11:00
parent e7c8d890b9
commit 5238fc8d22
4 changed files with 611 additions and 8 deletions
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51
server.js
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@@ -27,18 +27,28 @@ app.get('/', (req, res) => {
res.sendFile(path.join(__dirname, 'index.html'));
});
// Database health check endpoint
// Database health check endpoint with detailed diagnostics
app.get('/api/db-status', async (req, res) => {
const startTime = Date.now();
const dbConfig = require('./db.config.js');
let status = {
connected: false,
latency: 0,
writeCapable: false,
timestamp: new Date().toISOString(),
error: null
error: null,
// Additional diagnostic info for testing phase
host: dbConfig.host || 'unknown',
database: dbConfig.database || 'unknown',
user: dbConfig.user || 'unknown',
connectionLimit: dbConfig.connectionLimit || 'unknown',
poolStats: null
};
try {
console.log(`[DB-STATUS] Testing connection to ${status.host}/${status.database}...`);
// Test connection with a simple query
const [result] = await db.pool.query('SELECT 1 as test');
const latency = Date.now() - startTime;
@@ -46,9 +56,23 @@ app.get('/api/db-status', async (req, res) => {
if (result && result[0].test === 1) {
status.connected = true;
status.latency = latency;
console.log(`[DB-STATUS] ✅ Connection successful (${latency}ms)`);
// Get pool statistics
try {
status.poolStats = {
totalConnections: db.pool.pool._allConnections.length,
freeConnections: db.pool.pool._freeConnections.length,
queuedRequests: db.pool.pool._connectionQueue.length
};
console.log(`[DB-STATUS] Pool stats:`, status.poolStats);
} catch (poolError) {
console.log(`[DB-STATUS] Could not retrieve pool stats:`, poolError.message);
}
// Test write capability
try {
console.log(`[DB-STATUS] Testing write capability...`);
const testTableName = '_health_check_test';
// Create test table if it doesn't exist
@@ -80,17 +104,34 @@ app.get('/api/db-status', async (req, res) => {
`);
status.writeCapable = true;
console.log(`[DB-STATUS] ✅ Write test successful`);
} catch (writeError) {
console.error('Write test failed:', writeError.message);
console.error(`[DB-STATUS] ❌ Write test failed:`, writeError.message);
status.writeCapable = false;
status.error = `Write test failed: ${writeError.message}`;
}
}
} catch (error) {
console.error('Database health check failed:', error.message);
console.error(`[DB-STATUS] ❌ Connection failed:`, error.message);
console.error(`[DB-STATUS] Error code:`, error.code);
console.error(`[DB-STATUS] Error errno:`, error.errno);
status.connected = false;
status.latency = Date.now() - startTime;
status.error = error.message;
// Provide more detailed error messages
let errorMessage = error.message;
if (error.code === 'ECONNREFUSED') {
errorMessage = `Connection refused to ${status.host}. Is MySQL running?`;
} else if (error.code === 'ER_ACCESS_DENIED_ERROR') {
errorMessage = `Access denied for user '${status.user}'. Check credentials.`;
} else if (error.code === 'ER_BAD_DB_ERROR') {
errorMessage = `Database '${status.database}' does not exist.`;
} else if (error.code === 'ENOTFOUND') {
errorMessage = `Host '${status.host}' not found. Check hostname.`;
}
status.error = errorMessage;
}
res.json(status);