By default, the tracer automatically discovers exit calls passed over HTTP or inter-AWS¹ Lambda calls. Use the reportExitCallError method to report errors and exceptions that occur during exit call execution.

The following code snippet demonstrates how to create an exit call error report:

// Use the Exit Call API in your AWS Lambda handler function
module.exports.myLambdaHandler = async function () {
const queryPromise = new Promise(function (resolve, reject) {
const dbConfig = {
host: '127.0.0.1', // The host where your MySQL server runs
port: 3306, // Note that this is not an identifying property. Identifying properties must be strings
user: 'root',
database: 'movies'
};
const mysql = require('mysql');
const mysqlClient = mysql.createPool(dbConfig);
mysqlClient.getConnection(function (err, connection) {
if (err) {
reject({
statusCode: 500,
body: 'Couldn\'t make the connection to mysql client.'
});
return;
}
// Create an Exit Call
var exitCall = tracer.startExitCall({
exitType: 'DB',
exitSubType: 'DB',
identifyingProperties: {
'HOST': '127.0.0.1', // The host where your MySQL server runs
'PORT': '3306',
'DATABASE': 'movies',
'VENDOR': 'MYSQL'
}
});
connection.query('SELECT * FROM ClassicHits', function (err, results) {
connection.release();
//Create an Exit Call error report
if (err) {
tracer.reportExitCallError(exitCall, 'MYSql error', 'Failed in making the query');
reject({
statusCode: 500,
body: 'Mysql query failed'
});
return;
}
resolve({
statusCode: 200,
body: JSON.stringify(results)
});
});
});
});
return queryPromise;
}