Specified when websocket is initialized. Documents once
opened in readonly mode cannot edit throughout the life of the session.
This is very much like present view mode except the ability to
change to edit mode.
Change-Id: I176e3bbf210c3383268d1a5b50dc17f0cbfb26b8
Tile invalidation and painting can race with one another.
A race when the user types two characters in quick succession:
1. After the first key press, the tile is invalidated.
2. The client request the tile on receiving the invalidate.
3. TileCache doesn't find it, and adds subscription.
A. Sometime before rendering, the second key press is received.
B. This invalidates the very same tile.
C. The client request the same tile.
D. TileCache finds a subscription and ignores the new one.
4. The tile is rendered and sent back.
5. Subscription is found and the tile is forwarded to clients.
6. Subcription is removed as the request is fullfilled.
E. The second tile is rendered and sent back.
F. TileCache finds no subscription and the tile is dropped.
End result: Only the first character appears on the screen.
Versioning fixes the above situation by making sure that in
step 5 the subscription will show to belong to a different
(and newer version) and so the tile will be ignored.
Instead, at F the TileCache will find both subscription
and a matching version and the lastest version will always
be sent back to the client.
Change-Id: I7d7fe1407cda1908d794683c3ce4c2fd18609a2f
Reviewed-on: https://gerrit.libreoffice.org/25341
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
Tiles can be rendered in large batches and sent back
as combined payloads, all reduce latency and overhead
significantly.
Initial tests show a reduction in total latency by 2x.
This without sending tiles back to the client in combined
form, which will reduce latency further.
Change-Id: Iee06503f2a6c741fadb2c890266ea514c809c0dc
Reviewed-on: https://gerrit.libreoffice.org/25339
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
A source file (.cpp) must include its own header first.
This insures that the header is self-contained and
doesn't depend on arbitrary (and accidental) includes
before it to compile.
Furthermore, system headers should go next, followed by
C then C++ headers, then libraries (Poco, etc) and, finally,
project headers come last.
This makes sure that headers and included in the same dependency
order to avoid side-effects. For example, Poco should never rely on
anything from our project in the same way that a C header should
never rely on anything in C++, Poco, or project headers.
Also, includes ought to be sorted where possible, to improve
readability and avoid accidental duplicates (of which there
were a few).
Change-Id: I62cc1343e4a091d69195e37ed659dba20cfcb1ef
Reviewed-on: https://gerrit.libreoffice.org/25262
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
The tile and tilecombine messages apparently have optional
appendages at their rear ends. Not one, but two (at least).
While the first (timestamp) seems to be truely optional
(in the sense that leaving it out doesn't break anything,)
the same can't be said of the second (id).
For Impress slides this id is used to identify the slide
to which the tile belongs. Or rather the slide being
rendered, as it seems meaningful only for the slide
thumbnails.
Previously the complete arguments of tile were copied
verbatim from the input to the output (i.e. back to the
client) and so any extra payload was also echoed back.
But when id is missing (when expected) loleaflet not
only fails to show these tiles (understandably,) but
it also fails to show the scrollbar for said slide
thumbnails altogether!
With the new logic to move the tile communication to
the child socket instead of the clients, the arguments
are parsed and then serialized back in the response.
So all fields must be explicitly known in advance.
This change is necessary because tilecombine is broken
to tile commands and so both share common code. This
means that echoing back the request verbatim will
break loleaflet since tilecombine arguments (which
is a list) is not a valid response (which has the
format of tile). So the internal representation
has to be something neutral/common.
The fix is to parse the timestamp and id only when
provided and to echo back the id only in that case.
Change-Id: Ic97cf0de4083d412a4b3543e8b9a8713ac27a27c
Reviewed-on: https://gerrit.libreoffice.org/24669
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
WSD's DocumentBroker and Kit's Document now handle
the communication of tiles as well as all aspects
of rendering, caching, unifying requests and
distributing results etc.
Change-Id: Ie22fbaaae26b91185ee348ec7077f30430eec0f6
Reviewed-on: https://gerrit.libreoffice.org/24640
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
...child from DocumentBroker""
Restore the communication with child from DocumentBroker.
This reverts commit 20ab6e8ae7.
Change-Id: I248bededff7074d8fb482b2cdd172048f80c02b2
Reviewed-on: https://gerrit.libreoffice.org/24639
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
The WebSocket that each child created with WSD is not used
except to request the child to load the document a client
requests. Beyond this point, it was not utilized for anything.
In fact, there are no handlers in WSD for messages coming
from the child; it is a one-way communication.
That is until now. With the move to unify communication
between WSD and each child, DocumentBroker can now
receive and handle messages from its ChildProcess.
Change-Id: Ie7f030a92db8303cd7087fff2325f136a49bc7fc
Reviewed-on: https://gerrit.libreoffice.org/24581
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
This makes for amore compact API and avoids
a race between issuing the save and waiting for it.
Also added force flag and autoSave now checks the
modified state of the document. If a document is
not modified, nor save forced, autoSave checks
the last activity on the document and only
if there is any since last save does it issue
a save command.
Change-Id: I962e36df18d7edf5f658992e97b5def5f6247dc3
Reviewed-on: https://gerrit.libreoffice.org/24382
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
When multiple users have a document open,
save notficiations are broadcast to all.
Each session then tries to store the document
to the Storage when only the first should suffice.
A new file modified-time member tracks the file's
timestamp and only persists when it changes,
thereby avoid excessive stores.
Change-Id: I138f1aa812963a2120a1fcac763dfacccc542c1a
Reviewed-on: https://gerrit.libreoffice.org/24381
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
All changes are supposed to be persistent. This simplifies the tile
caching code quite a lot.
The TileCache object no longer needs to keep any state whether the
document is being edited or whether it has been modified without
saving etc.
Update the modtime.txt file after saving the document. Otherwise the
tile cache would wrongly be considered invalid next time.
As a sanity check, we put a flag file 'unsaved.txt' into the cache
directory whenever we get a callback that indicates the document has
been modified, and remove it when the document is saved. If the flag
file is present when we take an existing tile cache into use, we can't
trust it.
Even after these changes, we still don't use an existing tile cache as
much (or at all?) as we could, though. The INVALIDATE_TILES EMPTY
callback that LO does early on in a conection causes us to remove all
cached tiles...
This also avoids the feedback loop that results from the kit
thinking the previously inactive client is now active and
sending commands (.uno:Save).
Change-Id: I47074b35a922da15592d550032d494ba1efab83e
Reviewed-on: https://gerrit.libreoffice.org/24287
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
When a new view is created on a document that is
in the process of unloading, all sorts of things
can go wrong. This is especially problematic when
the document needs to be saved before unloading,
which takes significantly longer than otherwise.
Change-Id: Ib33a18cafa9d5a3a17f6bd8c6145f9331ae54044
Reviewed-on: https://gerrit.libreoffice.org/24184
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
Last client disconnection now correctly issues a save
and waits for the confirmation before tearing down
the sockets, queues and threads.
Change-Id: I28c28d79a17d359e9aa1fe67b983ca9fb592b847
Reviewed-on: https://gerrit.libreoffice.org/23978
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
The sessions container already has the number of sessions.
No need for separate counters to track them.
Change-Id: I838865e2b8a843e87e81a6cc1226bcacd774b032
Reviewed-on: https://gerrit.libreoffice.org/23964
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
Autosaving is done by DocumentBroker, which
tracks the last save time.
There are two triggers: idle and auto save.
The first triggers when sufficient time passes
after the last interaction the user had with
the UI (currently 30 seconds).
The second triggers when it's been more than
5 minutes since the last save.
Both triggers are conditional on the user
being active after the last save.
The new code auto-saves doesn't issue
a save command per session, but only
one per doc.
Change-Id: Iada15c16002e70710d2c13a3dcfdab036d8935c6
Reviewed-on: https://gerrit.libreoffice.org/23951
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
Much better than assuming that errno would be relevant at all
Log::error() calls (or alternatively, having to remember to append a
false parameter to the Log::error() call, which had not been done a
single time anyway.)
Call log::syserror() right after a system call has returned an
error. Don't call it otherwise.
Admin no longer needs a pipe as it's notified
from WSD. It is now a singleton with improved
locking.
The tracking of documents and views still needs
improvement and corrections.
Change-Id: If614331de6dd595c6dd4443f480d4ab588ca4551
Reviewed-on: https://gerrit.libreoffice.org/23860
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
WSD now communicates on a WebSocket directly
with kit processes. ChildProcess encapsulates
kit processes and the control WS, which itself
is owned by DocumentBroker.
Change-Id: Ica209aaa07974739b8e51a14e11325d084e193f6
Reviewed-on: https://gerrit.libreoffice.org/23789
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
... which can be taken only one at a time. Others can only view,
not edit. When a session with edit lock exits, the edit lock is
handed over to the next alive session.
Change-Id: I712a4e70369f1d07c1d83af416a0f5c288b05c7d
