Prevent races between encrypt and decrypt calls, and other read/write
operations on the session store by serializing session io ops per
device.
Possible fix for #535
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Because remote clients will delete all sessions in response to an end
session message, regardless of which device it came from, when our
linked device sends an end session message, we must also end all
sessions with the destination.
This change moves the end session flag processing to processDecrypted,
which is shared between handlers of sent messages, data messages, and
messages which are re-tried after resolving identity conflicts.
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Help debug bad session errors by logging some envelope info about the
message we are about to decrypt. With this, if there is a decryption
error (e.g., bad mac or no session) it is clear from the logs what
number and device message sent the bad message.
Also log when we send and receive end session messages and when we close
sessions for certain devices.
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Previously we would delete our own key from the trust store when
re-linking, in case it changed. We can also immediately take one step
further and store the new key. Typically this happens in the course of
requesting sync info from the master device, except in the case of
standalone clients.
Closes#596
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Sometimes an error is thrown while processing groups from a group sync
message. We still want to fire the groupsync event when we're done
handling all the data, even if some of it was bad.
Similar in function to an xhr request, a textsecure.SyncRequest object
is initialized from a message sender and receiver pair and initiates a
request for sync from the master device. It later fires a success event
when both contacts and groups are done syncing, or a timeout event after
one minute.
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lilia