This backports some test work that is being added in #1340 to assert
that the worker is actually marking connections closed in its *local*
state on a failure to contact the controller. This was missed in #1357
during some late-stage refactoring.
Summary of the changes:
* If we can't actually contact the controller during connection closure
to mark the connections as closed, we actually construct a "fake"
response that just simply includes a closed state for all connections
requested. This is then used to update the local connection state.
* Added a 3 second timeout to the CloseConnection request to the
controller to ensure the call to close connections completed in a
timely manner and did not hang indefinitely.
Testing enhancements:
* Added a new helper in TestHelper called LookupSession that allows the
lookup of a session from the worker's internal session state.
* This is used in the new ExpectConnectionStateOnWorker check in the E2E
test, which is part of a larger amount of enhancements to the E2E test
that are coming in #1340.
* Added a ConnectionStatusFromProtoVal helper function to the session
package to allow the conversion of protobuf connection status values to
their higher-level counterparts; essentially it is a reverse of
ConnectionStatus.ProtoVal. This is used in some of our tests (with more
coming in #1340) to just help with keeping things more idiomatic.
Finally, there is some minor error refactoring, and we also change the
timeout on internal status and connection close requests to the
controller to 5 seconds.
Chris Marchesi
48e55f156a