BaseX-Talk

basex-talk@mailman.uni-konstanz.de

8 participants
5255 discussions

Too aggressive optimizations?
by Marco Lettere 07 Feb '23

07 Feb '23

Dear all, my scenario is a RestXQ: - download resources and store them in temporary directory. - do it with fork-join in order to obtain smaller latency - compress to zip archive and return the archive data. I've noticed often the archive arrives empty. So after investigation I've found that query [1] isnon predictable. It is often optimized to "count(0)". I can manage to produce results from time to time but not consistently with [2]. [3] Seems the safer solution. The behavior is the same with 9.x and 10. Since I do not feel very comfortable, is there someone who can tell me if I'm doing it wrong or if there is a secure solution or if I should abandon fork-join tout-court? Thanks a lot. Regards, Marco. [1] let $ops := ( for $i in (1 to 5) let $url := "http://www.google.com" return function(){ (file:write(file:create-temp-file("ttt",string($i)),fetch:content-type($url))) } ) let $download := xquery:fork-join($ops) return count($ops) [2] let $ops := ( for $i in (1 to 5) let $url := "http://www.google.com" return function(){ (file:write(file:create-temp-file("ttt",string($i)),fetch:content-type($url)),1) } ) let $download := xquery:fork-join($ops) return count($ops) [3] let $ops := xquery:fork-join( for $i in (1 to 5) let $url := "http://www.google.com" return function(){ (1, file:write(file:create-temp-file("ttt",string($i)),fetch:content-type($url))) } ) return count($ops)

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Reducing logs
by Marco Lettere 03 Feb '23

03 Feb '23

Dear all, when using the Basex Xquery server (9.7.3) we see that logs such as [1] are produced for every query execution. Since we have a scenario which involves polling and thus we have a lot of query executions the log files increase to hundreds om MBs during a day. This makes them unmanageable and even cause dba UI to crash with OOM exceptions when opening the logs page. Is there a way to disable this logging (without affecting other logs such as HTTP)? Is it really necessary to log server side query executions at this grain by default? Maybe it could be made optional? Thanks for any support. Regards, Marco. [1] 12:22:27.849 10.0.4.15:50424 admin OK 0.02 CLOSE[0] 12:22:27.848 10.0.4.15:50434 admin OK 1.40 FULL[0] 12:22:27.848 10.0.4.15:50424 admin OK 0.83 FULL[0] 12:22:27.847 10.0.4.15:50420 admin OK 0.05 CLOSE[0] 12:22:27.847 10.0.4.15:50412 admin OK 0.04 CLOSE[0] 12:22:27.847 10.0.4.15:50434 admin OK 0.05 BIND[0] db=infrastructures as xs:string 12:22:27.846 10.0.4.15:50410 admin OK 0.22 CLOSE[0] 12:22:27.846 10.0.4.15:50434 admin OK 0.06 BIND[0] id=ontheroad-lxd as xs:string 12:22:27.846 10.0.4.15:50424 admin OK 0.05 BIND[0] db=infrastructures as xs:string 12:22:27.846 10.0.4.15:50420 admin OK 0.62 FULL[0] 12:22:27.846 10.0.4.15:50412 admin OK 0.90 FULL[0] 12:22:27.846 10.0.4.15:50424 admin OK 0.06 BIND[0] id=ontheroad-lxd as xs:string 12:22:27.845 10.0.4.15:50380 admin OK 0.02 CLOSE[0] 12:22:27.845 10.0.4.15:50366 admin OK 0.01 CLOSE[0] 12:22:27.845 10.0.4.15:50402 admin OK 0.02 CLOSE[0] 12:22:27.845 10.0.4.15:50420 admin OK 0.04 BIND[0] db=infrastructures as xs:string 12:22:27.845 10.0.4.15:50386 admin OK 0.02 CLOSE[0] 12:22:27.845 10.0.4.15:50410 admin OK 0.88 FULL[0] 12:22:27.845 10.0.4.15:50420 admin OK 0.06 BIND[0] id=ontheroad-lxd as xs:string 12:22:27.845 10.0.4.15:50412 admin OK 0.04 BIND[0] db=infrastructures as xs:string 12:22:27.845 10.0.4.15:50434 admin OK 0.04 QUERY[0] declare variable $id external; declare variable $db external; db:open($db)[json/id = $id]

3 3

Different results when importing HTML documents
by Timothée 02 Feb '23

02 Feb '23

Hello all, I am trying to store HTML documents in BaseX. I setup a local instance of BaseX on my computer using Docker, and I imported this file in it: https://pastebin.com/HJdJgLv9 On my local BaseX instance, the document is imported and "/html/body/article" does return the <article> node as expected. On my remote/production BaseX instance (using the same Dockerfile and image), the document is imported but the <article> tag is "stripped" (even though its contents / child nodes remain in the imported document). "/html/body/article" is empty. If I copy over the .basex files from my local database to my remote database, then the documents are complete like on my local instance. I also tried to import the documents again on my local instance, and the <article> tag gets stripped too (and the child nodes remain). What am I doing wrong when importing my documents? What did I do to import them properly in my current local instance? I tried a lot of options but I just can't figure out why this happens (I fiddled a lot with it). I used the following options when importing my documents, as per the documentation: SET PARSER html SET HTMLPARSER method=xml,nons=true,nocdata=true,nodefaults=true,nobogons=true,nocolons=true,ignorable=true SET CREATEFILTER *.html I also use SET FTINDEX true but I don't think it would have an impact anyway. Thank you very much! - Tim

2 3

bug in BaseX104 with function arity determination
by Rob Stapper 31 Jan '23

31 Jan '23

Hi Christian, See attachment. When running, function ‘local:test1a’ triggers an error: ‘[XPTY0004] 2 arguments supplied, 3 expected: $f’. It looks like the arity of a function is incorrectly determined when called with a partial parameter set. ‘function ‘local:test1b’ is a workaround. Can you please have a look at this? Thanx in advance, Rob Stapper Sent from Mail for Windows -- This email has been checked for viruses by Avast antivirus software. www.avast.com

2 3

BaseX bug report
by Veysel Karslı 23 Jan '23

23 Jan '23

Hello, We got an error about BaseX. We connect BaseX Java Server from our application developed with C#. Thank you for your support. Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 10.3 Java: Oracle Corporation, 19.0.1 OS: Windows Server 2019, amd64 Stack Trace: java.lang.ArrayIndexOutOfBoundsException: Index 4304 out of bounds for length 4096 at org.basex.io.random.TableDiskAccess.read1(TableDiskAccess.java:160) at org.basex.data.Data.kind(Data.java:312) at org.basex.query.up.atomic.AtomicUpdateCache.adjustDistances(AtomicUpdateCache.java:320) at org.basex.query.up.atomic.AtomicUpdateCache.execute(AtomicUpdateCache.java:276) at org.basex.query.up.DataUpdates.apply(DataUpdates.java:167) at org.basex.query.up.ContextModifier.apply(ContextModifier.java:120) at org.basex.query.up.Updates.apply(Updates.java:179) at org.basex.query.QueryContext.update(QueryContext.java:660) at org.basex.query.QueryContext.lambda$4(QueryContext.java:354) at org.basex.query.QueryContext.run(QueryContext.java:763) at org.basex.query.QueryContext.iter(QueryContext.java:354) at org.basex.query.QueryProcessor.iter(QueryProcessor.java:95) at org.basex.server.ServerQuery.execute(ServerQuery.java:125) at org.basex.server.ClientListener.query(ClientListener.java:397) at org.basex.server.ClientListener.run(ClientListener.java:104) -- Veysel Karslı Managing Partner & Co-founder M +90 543 238 8328 E veysel.karsli(a)codease.io CodEase Teknoloji Barbaros mh. Begonya sk. No:1/2 Ataşehir / İstanbul www.codease.io

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Symlinks bug in webapp
by Jerome Chauveau 23 Jan '23

23 Jan '23

Hello, Symlinks seem to be not fonctional anymore since BaseX10 (Maybe before) in webapps. Is it due to a new version of Jetty ? I pushed a dummy example on that repository : [ https://git.unicaen.fr/chauveau/test-basex-symlinks | https://git.unicaen.fr/chauveau/test-basex-symlinks ] Thanks for your help ! Jérôme

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Integrating BaseX With Server-Side Python
by Eliot Kimber 23 Jan '23

23 Jan '23

I’ve started implementing some sophisticated DITA data processing in Python, including using the Python xlsxwriter to easily generate Excel spreadsheets, something that would be more work to add to BaseX using Java and the Apache POI libraries. I’m also seeing that the Python streamlit tool, which provides sophisticated web pages for visualizing Python-based data (i.e., graphing from Pandas dataframes) would be a convenient way to generate graphs. I’m wondering: 1. Has anyone integrated streamlit with BaseX, for example, by running a streamlit server and using iframes from BaseX-served web pages to deliver graphs and whatnot. If so, are there any particular concerns or is it as simple running the server and creating the iframe? 2. What would be the best way to run or access Python scripts from BaseX server, for example, to run a script that will generate an Excel sheet from some data on the server (or provided by BaseX in some convenient form) and then serve the generated result back out? I think it should be as easy as using the process module to run Python commands from the command line, but again, wondering if there are any non-obvious considerations? Part of my new focus on Python is that my colleagues are Python-literate but not XQuery or XSLT literate, so it turns out to be best for us to do as much in Python as possible. But also the cost of doing really cool things in Python is just really low, streamlit being a good example. Thanks, E. _____________________________________________ Eliot Kimber Sr Staff Content Engineer O: 512 554 9368 M: 512 554 9368 servicenow.com<https://www.servicenow.com> LinkedIn<https://www.linkedin.com/company/servicenow> | Twitter<https://twitter.com/servicenow> | YouTube<https://www.youtube.com/user/servicenowinc> | Facebook<https://www.facebook.com/servicenow>

2 1

Socket specifications?
by Ben Engbers 21 Jan '23

21 Jan '23

Hi, When I developed the Basex client for R, I ran into problems with the socket for a long time. In the end it turned out that in R I had to configure the socket as a non-blocking socket. This solved all performance issues! I am now trying to develop a client for SWI-prolog. Because that low-level compiler doesn't support using sockets enough, I need to develop a library in C++ first. And in doing so, I again run into problems with the socket. The basex documentation just says to use a socket. But there is no information on how to configure the socket itself. My question is how do I configure the client side of the socket for optimal use? Ben Engbers

3 2

Minor issue: format-date?
by Alexander Witzigmann 20 Jan '23

20 Jan '23

Hi, The format-date has one minor issue using format-date(xs:date("2022-01-01"),"[D]. [Mn] [Y]","de",(),()) should return 1. Januar 2022 but currently (BaseX 10.4) returns 1. januar 2022 alex

2 2

RESTXQ advice?
by Hans-Jürgen Rennau 19 Jan '23

19 Jan '23

Hello, I encounter a problem with a RESTXQ application, perhaps someone can help me? *Goal:* Download a file with an encoding dependent on a user entry. The request contains *form parameters*. *Attempt:* I can control the encoding using the %output annotation. However, this annotation must be a literal string, I think. Therefore I tried *web:forward*, as well as *web:redirect*, thus triggering the execution of a function with the desired %output declaration. *Issue:* the form parameters get lost. How to achieve the goal? Thank you for your advice. With kind regards, Hans-Jürgen declare %output:method("text") %output:encoding("utf-8") %rest:path("*/util/download/text*") %rest:form-param("text", "{$text}", "") %rest:form-param("file-name", "{$fileName}", "text.txt") %rest:form-param("encoding", "{$encoding}", "utf-8") function *f:downloadText*( $text as xs:string, $fileName as xs:string, $encoding as xs:string) { if ($encoding eq 'cp1252') then *web:forward*(' */util/download/text-cp1252*') else ... declare %output:method("text") %output:encoding("cp1252") %rest:path("*/util/download/text-cp1252*") %rest:form-param("text", "{$text}", "") %rest:form-param("file-name", "{$fileName}", "text.txt") function *f:downloadTextCp1252*( $text as xs:string, $fileName as xs:string) { let $text := replace($text, '
', '
') return ( <rest:response> <http:response status="200"> <http:header name="Content-Disposition" value='attachment; filename="{$fileName}"'/> <http:header name="Content-Language" value="en"/> <http:header name="Content-Type" value="text/csv; charset=cp1252"/> </http:response> </rest:response>, $text ) }; PS: The <http:header> seems to be without effect - experiments seemd to show that I have to use the %output declaration.

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