We don't want to start processing events until those events have
somewhere to be sent to.
Also, to be safe, ensure remove and re-add the gluon user while
clearing its sync status. This shouldn't be necessary.
There is concurrency bug due to competing sync calls that can occur when
we clear the sync status in the Vault. Running sync at the end of
addIMAPUser() avoids the problem.
This patch also remove the execution of a sync task for
`user.ClearSyncStatus()`
For every update sent to gluon wait and check the error code to see if
an error occurred.
Note: Updates can't be inspect on the call site as it can lead to
deadlocks.
When we send a message, the send recorder records the sent message.
When the client then appends an identical message to the sent folder,
the deduplication works and instead returns the message ID of the
existing proton message, rather than creating a new message. Gluon is
expected to notice that it already has this message ID and perform
some deduplication stuff internally.
However, it can happen that gluon doesn't yet have this message ID,
because we haven't yet received the "Message Created" event from the
API. To prevent this, we poll the events after send and wait for all
new events to be applied.
There's still a chance that the event wasn't generated yet on the API
side. Not sure what we can do about this.
After sending, a client might append to the sent folder over IMAP.
In this case, we perform deduplication and return the message ID of the
sent message. However, if we haven't already processed this message in
gluon, it doesn't work as expected.
This change polls the event stream immediately after send. Note that it
doesn't wait for these events to be processed; that should be done in a
follow-up commit.
This change implements safe.Mutex and safe.RWMutex, which wrap the
sync.Mutex and sync.RWMutex types and are assigned a globally unique
integer ID. The safe.Lock and safe.RLock methods sort the mutexes
by this integer ID before locking to ensure that locks for a given
set of mutexes are always performed in the same order, avoiding
deadlocks.
James Houlahan
Leander Beernaert
Jakub