Modify the variable for each VU in K6 (refresh token)

Question

Modify the variable for each VU in K6 (refresh token)

When I start my K6 test, I utilize my setup() function to obtain a token that will be used by every VU. I want each VU to have the same token, rather than generating individual tokens for each one.

Although this works fine initially, the challenge arises when the token needs to be refreshed after 1 hour of testing.

Once again, I aim to acquire a new token and distribute it equally among all VUs (avoiding the scenario where each VU receives a unique token). Unfortunately, K6 does not provide a straightforward solution for accomplishing this task.

How can I tackle this issue? Is there a way to share variables between VUs in K6? If not, what is the most effective approach to handle this situation?

Your insights are greatly appreciated.

I attempted initiating a new scenario after 1 hour to update the variable, but the changes were not reflected in the running VUs.

javascript performance testing grafana k6

Answer 1

Answer №1

Since each k6 Virtual User (VU) operates in its own JavaScript runtime, direct communication between VUs is not possible without a mediator.

To facilitate communication among your VUs, the simplest approach is to utilize the experimental Redis module. Setting up a Redis server for this purpose is relatively uncomplicated.

For an illustrative example, refer to the documentation available here.

In your specific scenario, it would be advisable to create two distinct scenarios:

In one scenario, a single VU can manage token retrieval at specified intervals. By calling the relevant endpoint, you should be able to retrieve a refresh token as needed. This VU can then set a key=value pair on Redis using

await redisClient.set('token', "<token value>");

.

Meanwhile, the VUs in the second scenario can invoke await redisClient.get('token');, which will pause execution until the specified key becomes accessible. It may be prudent to implement logic that ensures a new token is only retrieved when necessary for refreshing purposes.

Answer 2

Since each k6 Virtual User (VU) operates in its own JavaScript runtime, direct communication between VUs is not possible without a mediator.

To facilitate communication among your VUs, the simplest approach is to utilize the experimental Redis module. Setting up a Redis server for this purpose is relatively uncomplicated.

For an illustrative example, refer to the documentation available here.

In your specific scenario, it would be advisable to create two distinct scenarios:

In one scenario, a single VU can manage token retrieval at specified intervals. By calling the relevant endpoint, you should be able to retrieve a refresh token as needed. This VU can then set a key=value pair on Redis using

await redisClient.set('token', "<token value>");

.

Meanwhile, the VUs in the second scenario can invoke await redisClient.get('token');, which will pause execution until the specified key becomes accessible. It may be prudent to implement logic that ensures a new token is only retrieved when necessary for refreshing purposes.

Modify the variable for each VU in K6 (refresh token)

Answer №1

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