BaseX-Talk

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5245 discussions

Write functions in sequence
by Giuseppe G. A. Celano 12 Mar '19

12 Mar '19

Hi I wrote a single script which should do: write a file -> open this file -> write another different file. I put the write expressions in the right sequence, but it seems that the second one cannot happen because the file created by the first write function has not yet been created at the time the second function is invoked. Does anyone have a suggestion about this? Thanks. Best, Giuseppe

3 7

Serialization issue with HTTP response
by Marco Lettere 08 Mar '19

08 Mar '19

Hi all, we have to deal with a third-party REST service which in case of error conditions returns this mime type: /*application/problem+json; charset=utf-8*/. I wrote this RestXQ [1] to mock it. Just copy it into restxq.xqm... When I call it like [2] I get /*[XPTY0004] Cannot convert xs:base64Binary to xs:string: "IntcImFcIjpcImJcIn0i"*/. This is because the response is seen as a binary and this can be double checked calling with [3]. I felt (maybe wrongly) that specializations of the mimetype had been faced in BaseX implementation of http:request somewhere back in time but I couldn't find anything in the mail archives. The strange thing however is that I get the same error when calling like [4] with override-mime-type set to text/json or application/json which instead I was expecting to work. Is the behaviour in this scenario expected or does this hide some inconsistency? Thanks, as usual, for the support. Regards, Marco. [1] declare%rest:path("mc/dummy") %rest:GET %output:method("json") function page:dummy() { <rest:response> <http:response status="400"> <http:header name="Content-Type" value="application/problem+json; charset=utf-8"/> </http:response> </rest:response>, '{"a":"b"}' }; [2] json:parse( http:send-request(<http:request method="get"/>,"http://localhost:8984/mc/dummy")[2] ) [3] json:parse( convert:binary-to-string( http:send-request(<http:request method="get"/>,"http://localhost:8984/mc/dummy")[2] ) ) [4] json:parse( http:send-request(<http:request method="get" override-media-type="application/json"/>,"http://localhost:8984/mc/dummy")[2] )

2 5

Using HTTP Digest Authentication in a RESTXQ services
by Omar Siam 04 Mar '19

04 Mar '19

Hi list! I just experimented a bit to see if there is an obvious way to use HTTP digest authentication for some RESTXQ service I plan to write. I would prefer not to reimplement the HTTP digest logic in XQuery. I thought maybe there is a way to use the built in digest logic like for the REST endpoint. I don't seem to get that to work. Any suggestions? Best regards Omar Siam

2 5

RESTXQ and regexp
by Marco Lettere 04 Mar '19

04 Mar '19

Hello all, according to the docs this should be possible: (: Matches all paths with "app" as first, a number as second, and "order" as third segment :) declare %rest:path("app/{$code=[0-9]+}/order") function page:order($full-path) { ... }; (: Matches all other all paths starting with "app/" :) declare %rest:path("app/{$path=.+}") function page:others($path) { ... }; And it actually is... We are currently in the very unfortunate situation where we need the following: (: Matches anything followed by /input :) declare %rest:path("app/{$path=.+}/input") function page:inputs($path) { ... }; (: Matches all other all paths starting with "app/" :) declare %rest:path("app/{$path=.+}") function page:others($path) { ... }; Unfortunately this makes all the calls to be redirected to the page:others function ... is there a motivation behind it or could it be possible to work around that? Thanks, Marco.

3 3

If clause
by Giuseppe G. A. Celano 04 Mar '19

04 Mar '19

Hi, I see that in BaseX 9.1.2 an expression such as "if (3) then 4 " does not raise an error, even if the "else" part is missing. Is this correct? Ciao, Giuseppe

7 13

Class 'BaseXHTTP' missing?
by Jan Stapel 28 Feb '19

28 Feb '19

Hello, i just tried to run the Java REST-Examples found on GIT/the basex-doc. BaseXHTTP cannot be resolved to a type. I am using the current version. Am I missing something? best, Jan

2 1

Activating gzip compression
by Omar Siam 27 Feb '19

27 Feb '19

Hi, I tried both ways of enabling gzip compression for JSON and js (and others). I can't see it actually working. The GzipFilter method from the web.xml sample seems to be deprecated with a warning of "it is bug ridden" ... But then in a browser debugger I cannot see it actually zipping anything. I trief to enable this in my BaseX 9.1.2 instance using <filter> <filter-name>GzipFilter</filter-name> <filter-class>org.eclipse.jetty.servlets.GzipFilter</filter-class> <init-param> <param-name>mimeTypes</param-name> <param-value>text/html,text/xml,text/ecmascript,application/xhtml+xml,application/json,application/javascript,image/svg+xml</param-value> </init-param> </filter> <filter-mapping> <filter-name>GzipFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> The GzipHandler method seems to get loaded but then also in a browser debugger I cannot see it actually zipping anything. For the GzipHandler the documentation https://www.eclipse.org/jetty/documentation/current/gzip-filter.html talks about when it actually gets invoked and mentions: * No content-encoding is specified by the resource I found no way to not specify an encoding for whatever I return in RESTXQ. If I don't specify anything it's UTF-8. it shows up as "; character-set=UTF-8"I did not find a way to specify no encoding. Maybe unrelated but perhaps that is a problem. I modified webapp/WEB-INF/jetty.xml like this so it uses the GzipHandler (copied from the current jetty distribution): <Configure id="Server" class="org.eclipse.jetty.server.Server">  <Call name="addConnector"> ... </Call> <Call name="insertHandler"> <Arg> <New id="GzipHandler" class="org.eclipse.jetty.server.handler.gzip.GzipHandler"> <Set name="minGzipSize"><Property name="jetty.gzip.minGzipSize" deprecated="gzip.minGzipSize" default="2048"/></Set> <Set name="checkGzExists"><Property name="jetty.gzip.checkGzExists" deprecated="gzip.checkGzExists" default="false"/></Set> <Set name="compressionLevel"><Property name="jetty.gzip.compressionLevel" deprecated="gzip.compressionLevel" default="-1"/></Set> <Set name="inflateBufferSize"><Property name="jetty.gzip.inflateBufferSize" default="0"/></Set> <Set name="deflaterPoolCapacity"><Property name="jetty.gzip.deflaterPoolCapacity" default="-1"/></Set> <Set name="syncFlush"><Property name="jetty.gzip.syncFlush" default="false" /></Set> <Set name="excludedAgentPatterns"> <Array type="String"> <Item><Property name="jetty.gzip.excludedUserAgent" deprecated="gzip.excludedUserAgent" default=".*MSIE.6\.0.*"/></Item> </Array> </Set> <Set name="includedMethodList"><Property name="jetty.gzip.includedMethodList" default="GET" /></Set> <Set name="excludedMethodList"><Property name="jetty.gzip.excludedMethodList" default="" /></Set> </New> </Arg> </Call> </Configure> I hope there is a way to get this to work. Best regards Omar Siam

2 1

geo:distance() return units
by Jacob Borisov 26 Feb '19

26 Feb '19

Hello. Could anybody explain how to get a result from geo:distance() in kilometers or miles? Thanks.

2 3

Re: [basex-talk] BaseX-Talk Digest, Vol 110, Issue 29
by Shaun Flynn 25 Feb '19

25 Feb '19

Hello there Marco, This might be down to the choice of regex. Assume $path = "path" app/{$path=.+} Will match "app/path=1234" And "app/path=1234/input" Which I think would be matched by ".+" part of the expression, as "/input" would match ".+". Kind regards On Sat, 23 Feb 2019, 11:00 , <basex-talk-request(a)mailman.uni-konstanz.de> wrote: > Send BaseX-Talk mailing list submissions to > basex-talk(a)mailman.uni-konstanz.de > > To subscribe or unsubscribe via the World Wide Web, visit > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > or, via email, send a message with subject or body 'help' to > basex-talk-request(a)mailman.uni-konstanz.de > > You can reach the person managing the list at > basex-talk-owner(a)mailman.uni-konstanz.de > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of BaseX-Talk digest..." > > > Today's Topics: > > 1. RESTXQ and regexp (Marco Lettere) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 22 Feb 2019 12:05:29 +0100 > From: Marco Lettere <m.lettere(a)gmail.com> > To: BaseX <basex-talk(a)mailman.uni-konstanz.de> > Subject: [basex-talk] RESTXQ and regexp > Message-ID: <3f71e0bc-e16d-6c4d-6ee8-246a7cc7595c(a)gmail.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > Hello all, > > according to the docs this should be possible: > > (: Matches all paths with "app" as first, a number as second, and > "order" as third segment :) > declare %rest:path("app/{$code=[0-9]+}/order") > ? function page:order($full-path) { ... }; > > (: Matches all other all paths starting with "app/" :) > declare %rest:path("app/{$path=.+}") > ? function page:others($path) { ... }; > > And it actually is... We are currently in the very unfortunate situation > where we need the following: > > (: Matches anything followed by /input :) > declare %rest:path("app/{$path=.+}/input") > ? function page:inputs($path) { ... }; > > (: Matches all other all paths starting with "app/" :) > declare %rest:path("app/{$path=.+}") > ? function page:others($path) { ... }; > > Unfortunately this makes all the calls to be redirected to the > page:others function ... is there a motivation behind it or could it be > possible to work around that? > > Thanks, > > Marco. > > > > End of BaseX-Talk Digest, Vol 110, Issue 29 > ******************************************* >

2 1

read/write database locks
by Johannes Bauer 21 Feb '19

21 Feb '19

Hi, I need some input on how best to implement an updating database operation. I use BaseX within a Web Application and have RESTXQ service endpoints. One such service collects information from multiple databases and creates a new document (with the collected infos) in another database. The list of affected databases is dynamic and will be determined by the RESTXQ module. I'm afraid that, due to the missing static database information in the query, the service will lock *all* databases and because I have an updating operation the locks will be write locks. Depending on the amount of databases and their size, the operation might take some time (maybe even up to some minutes). And I don't want to have write locks for such a long period of time. I've also tried another approach: I use a non updating service that collects the data and then calls another RESTXQ service per HTTP request that makes the db update. This way I only have read locks on *all* databases and then a short single write lock on the modified db. But this did not work. The write call deadlocked. The first service probably has not released the read locks yet when the second service is called. I also tried to set the QUERYINFO option to see some lock information for my module, but I didn't get any output. Do you have any best practice on how to approach such a task? Best regards Johannes

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