Che + theia: Theia IDE do not send any activity events to wsmaster

[sunix]

Description

When using Theia in Che and having CHE_WORKSPACE_AGENT_DEV_INACTIVE__STOP__TIMEOUT__MS being set, workspace is killed after that time even if there is some activity in Che Theia IDE.

Reproduction Steps

In http://che.openshift.io, create a workspace using a theia stack for instance https://che.openshift.io/dashboard/#/factory/factorywj3405v4cnxdjmln. After 15 minutes, even if the user is working editing files or doing anything else, the workspace is being killed.

[sunix]

maybe should reuse https://github.com/eclipse/che/blob/master/ide/che-core-ide-app/src/main/resources/org/eclipse/che/public/activity.js client side

[sunix]

will we have CORS issue with that as well ? Could dashboard side bar track that instead of theia ?

[skabashnyuk]

@sunix can you consolidate all API on master on which you need CORS and create an issue for that?

[garagatyi]

In the future, it would be better to send the activity from the backend. This is part that makes sense to be compiled into the Che-Theia assembly or be added as a default plugin.
Now we can work around that with CORS exclusion, but it is kinda a flow when a user would be able to ping his WS from some cron job on his own computer.

[mmorhun]

Done.
Activity checker is added as Theia extension.
Requests to workspace master are performed from backend.
Both frontend and backend are optimized to send minimal amount of requests.