For now, do the check only when a new session connects to the
document, because at that point we fetch the document information (in
separate function for WOPI and local files) and construct the
FileInfo, including timestamp.
For now, just log an ERR message if we notice that the document in its
storage system (WOPI or local file system) has an unexpected last
modified time. What should we do? If we don't have unsaved changes,
most likely we should just silently reload the document and force all
sessions to refresh. But if we have unsaved changes, and the document
has changed underneath, we have a problem.
We need to fetch the timestamp also also after saving ("persisting")
as we can't assume that the clock on the machine running loolwsd and
that of the storage (as reported in the WOPI case in CheckFileInfo)
are in synch. (Assuming separate machines, they certainly won't ever
exactly in synch, but aren't necessarily even just a few seconds apart
(think incorrectly set up timezone etc), so no amount of tolerance in
the comparison would be good enough, because after all, it might be
that in the problematic cases we are looking for the timestamps also
are separated by a quite short time.)
Yes, this means there is a race condition; what if the document is
modified behind out back right after we have persisted it, before we
ask for its timestamp? It would be much better if the persisting
operation atomically also told what the timestamp of the document in
the storage is after persisting, but alas, WOPI doesn't do that.
Rename the DocumentBroker::origDocumentLastModifiedTime field to
_documentLastModifiedTime as that is less misleading. It is not the
"original" document timestamp but the timestamp of the document in its
storage system.
This needs much more work: Ideally the timestamp of the document in
its storage system should be retrieved and checked against the
expected value also before we are about to save it.
But unfortunately experience has shown that the WOPI CheckFileInfo
operation can be expensive, so we'll see what can be done. Ideally
WOPI should contain the optional functionality to return an error if,
when saving a document, its timestamp (and size?) in storage are not
what the saving client expects.
Also add a few FIXME comments.
Change-Id: I5a9b55d4b55a8db0c9ee8638edd368dc0aa325d5
Poco::Timestamp::fromEpochTime() is a static member function that
returns a Timestamp.
Let's hope this doesn't introduce any regression.
Change-Id: I0997c4c3128ec07d5db76dbf3ecc388cd19ac2ac
By that time the loleaflet code has already done the greying-out (this
happens at the latest after 10 minutes of inactivity) and marked them
as 'inactive'. Bluntly closing the session seems to work out fine, no
new horribly alarming message is displayed by the loleaflet code in
addition to the already visible 'Inactive document ...' one.
Change-Id: I420f0d7530194e6c8d6f34d7985ab810cde5a76a
To avoid degrading performance for everyone
because of a single slow/bad connection, we
send data to clients each in its own thread.
Change-Id: I6f980c25a404c4d05bcdb1979849ea3d2776c7b9
Reviewed-on: https://gerrit.libreoffice.org/31984
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
The pool is checked for expansion before processing
items from the queue. By tracking the number of idle
thread (i.e. not currently sending data) we ensure
that there is at least one idle thread before
we invoke the socket.
If there is not enough idle threads at that point,
a new thread is spawned, so long as we're below the
limit. This guarantees that even if all the active
threads block on the socket, we'd always have one
more to process new data (until we reach the limit,
which is as many client connections as we have).
Technically, a single slow connection could
still monopolize all connections if there are
many messages to be sent to it. For that we'd
need to track and assign one thread per connection,
something we don't currently do.
Change-Id: Ic8b5e064da068b37bcfa773005495b198763c31d
Reviewed-on: https://gerrit.libreoffice.org/31886
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
This adds SenderQueue and a wrapper of messages to
send back to clients.
Currently no threading takes place, but the messages
are pumped through the queue nonetheless.
Change-Id: Id9997539c0a2a351cbf406f649c268dd3643e88e
Reviewed-on: https://gerrit.libreoffice.org/31883
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
Use a new protocol message, 'resetidle' to inform Admin clients
whenever a user has done anything in a document view. This is a
message that Admin clients need to subscribe to.
Also add the current idle time for each document to the 'documents'
message.
To reduce protocol chatter, the idle time is updated at most once per
10 s.
Change-Id: I418e82b05048a3628f21dcd240ccd974b3a01356
Reviewed-on: https://gerrit.libreoffice.org/31653
Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>
