Found that libsynthesis based server generates Delete command for client
with empty item:
<Sync><CmdID>4</CmdID><Target><LocURI>./C:Calendar</LocURI></Target><Source><LocURI>./calendar</LocURI></Source><NumberOfChanges>1</NumberOfChanges><Delete><CmdID>5</CmdID><Meta><Type>text/x-vcalendar</Type></Meta><Item/></Delete></Sync>
when calendar superdatastore is being used.
Test environment:
- libsynthesis (engine version 3.4.0.24) based server
- 2 Symbian phones: Nokia E65 and Nokia E90 Communicator (named as A and
B, which one is A is not significant).
- superdatastore calendar was used
Perhaps also other Symbian phones can be used to reproduce the problem
Steps to repeat the problem:
1) create recurrent event on one of the phones (phone A), edit one of
occurrences (change time interval), delete one occurrence
2) synchronize phone A with server (should add 2 events)
3) synchronize phone B with server (event is added on this phone).
4) remove all occurrences of event from phone A and synchronize with
server (should remove 2 events from server according logs)
5) synchronize phone B with server. As far as I had tested, phone B has
before this step still pending update for recurrent event but not for
edited occurrence. As result replace/delete conflict occurs and
configuration setting deletewins was not used. Recurrent event is
re-added to server data-store but the modified occurrence is not even if
it remains in EXDATES.
6) attempting to synchronize phone B again causes the error mentioned at
the start to occur and the synchronization fails. In my case an attempt
to repeat synchronization does not help any more as the same error repeats.
This error also causes session event loop to receive
sysync::STEPCMD_DONE without actually returning a response to the
client. Significant status changes are visible from output below (ones
like STEPCMD_STEP ==> STEPCMD_OK and similar non-interesting ones are
not outputted):
2011/09/15 16:19:19.0159 -
ipn::tcp::HttpServerBase::Session::parse_request: INFO: request_id=145
remote_address='127.0.0.1' request_line='POST /syncml HTTP/1.1
body_length=291
HTTP request: session_id=N/A request_length=291
content_type='application/vnd.syncml+wbxml'
Generated ID: 'Remi685ET5bt0pQcZhzz7EJOudU'
session_step: 13:19:19.018 : t=0.000003 err=0 : STEPCMD_GOTDATA ==>
STEPCMD_OK
session_step: 13:19:19.051 : t=0.000213 err=0 : STEPCMD_STEP ==>
STEPCMD_SENDDATA
session_step: 13:19:19.051 : t=0.000002 err=0 : STEPCMD_SENTDATA ==>
STEPCMD_NEEDDATA
2011/09/15 16:19:19.0511 -
ipn::tcp::HttpServerBase::WorkerThread::process_request: INFO:
request_id=145: 200 (OK)
2011/09/15 16:19:19.3220 -
ipn::tcp::HttpServerBase::Session::parse_request: INFO: request_id=146
remote_address='127.0.0.1' request_line='POST
/syncml?sessionid=Remi685ET5bt0pQcZhzz7EJOudU HTTP/1.1 body_length=2096
Using existing session ID: 'Remi685ET5bt0pQcZhzz7EJOudU'
session_step: 13:19:19.322 : t=0.000003 err=0 : STEPCMD_GOTDATA ==>
STEPCMD_OK
session_step: 13:19:19.358 : t=0.023678 err=0 : STEPCMD_STEP ==>
STEPCMD_SENDDATA
session_step: 13:19:19.358 : t=0.000003 err=0 : STEPCMD_SENTDATA ==>
STEPCMD_NEEDDATA
2011/09/15 16:19:19.3585 -
ipn::tcp::HttpServerBase::WorkerThread::process_request: INFO:
request_id=146: 200 (OK)
2011/09/15 16:19:19.5674 -
ipn::tcp::HttpServerBase::Session::parse_request: INFO: request_id=149
remote_address='127.0.0.1' request_line='POST
/syncml?sessionid=Remi685ET5bt0pQcZhzz7EJOudU HTTP/1.1 body_length=399
2011/09/15 16:19:19.5674 -
ipn::tcp::HttpServerBase::Session::parse_request: INFO: request_id=149
remote_address='127.0.0.1' request_line='POST
/syncml?sessionid=Remi685ET5bt0pQcZhzz7EJOudU HTTP/1.1 body_length=399
HTTP request: session_id='Remi685ET5bt0pQcZhzz7EJOudU'
request_length=399 content_type='application/vnd.syncml+wbxml'
Using existing session ID: 'Remi685ET5bt0pQcZhzz7EJOudU'
session_step: 13:19:19.568 : t=0.000003 err=0 : STEPCMD_GOTDATA ==>
STEPCMD_OK
session_step: 13:19:19.623 : t=0.000002 err=0 : STEPCMD_STEP ==>
STEPCMD_DONE
2011/09/15 16:19:19.6228 -
ipn::tcp::HttpServerBase::WorkerThread::process_request: INFO:
request_id=149: 500 (INTERNAL ERROR)
As result the server has no data to send to the client as the response.
Internal error message at the end is caused by absence of the response.
Andris
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