OJ-2748 lambda warmer stage added to performance tests

[sandragds]

What?

Set up stage for imposter stub to warm up lambdas before performance testing is ran.

Changes:

• function added to run requests to imposter stub in nino-check
• nino-check.ts script modified to include the request before the performance test

---

Why?

• Due to lambda cold start issue, performance tests are slow in imposter stubs. To mediate the issue, lambdas can be warmed up by sending requests to the imposter stubs before the performance tests.

---

Related:

• OJ-2748

[abhinaysrivastavaperf]

Just to highlight, the latest changes mean that the lambda warmer call will be executed each iteration.

[Tom-Dann]

Suggested change

	let imposterstarted = false
	if (!imposterstarted) {
	const response = imposter.handler()
	console.log('Response status: ', response.status)
	console.log('Response body: ', response.body)
	imposterstarted = true
	}
	const response = imposter.handler()
	console.log('Response status: ', response.status)
	console.log('Response body: ', response.body)

This code is functionally the same as removing the imposterstarted variable and the if statement, as it will always run.

If you are trying to run this once at the beginning of the test I'd move this call to the setup() function, or if you want to run it once per VU the imposterstarted will need to be declared outside of the function scope.

[abhinaysrivastavaperf]

Yea I included this in the setup() function initially but I had a chat with Sandra and was advised that this needs to run periodically instead of only once.
To avoid running this as many time as the actual test iterations, we may have a separate function for this which will be called like 10% or 20% of the total number of executed iterations

[Tom-Dann]

Okay, well that approach will need to be implemented and the code smell fixed first before merging

[abhinaysrivastavaperf]

Updated the approach to make 10 concurrent request (as a batch request) in the setUp function and fixed the code smell.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[Tom-Dann]

Update the PR title, but otherwise okay