Given is a SessionManager that stores session information in memory. The SessionManager itself is working, however, since we keep on adding new sessions to the manager our program will eventually run out of memory.
Your task is to implement a session cleaner routine that runs concurrently in the background and cleans every session that hasn't been updated for more than 5 seconds (of course usually session times are much longer).
Note that we expect the session to be removed anytime between 5 and 7 seconds after the last update. Also, note that you have to be very careful in order to prevent race conditions.
To complete this exercise, you must pass two test. The normal go test test cases as well as the race condition test.
Use the following commands to test your solution:
go test
go test --race