[Haskell-beginners] how to debug Prelude.read: no parse

[PICCA Frederic-Emmanuel]

Hello, I am using the soap package and wrote a StreamParser which use the Consuite Xml system

I have this kind of error when I execute my code

[picca at process2 autoprocess-exe]$ stack exec autoprocessing-exe -- exec --json \{\"tag\":\"XdsMe\",\"contents\":[39878,[0,0,0,0,22,0],null,\"UnCompressed\"]\} +RTS -xc -Pa
response:<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><ns2:findDataCollectionResponse xmlns:ns2="http://ispyb.ejb3.webservices.collection"><dataCollection><actualCenteringPosition> /omega=280.000125 /phi=0.000020 /uglidex=-1.403875 /phiz=-0.127760 /chi=0.000005 /uglidey=-0.508216 /zoom=646.972000</actualCenteringPosition><axisEnd>180.0</axisEnd><axisRange>0.1</axisRange><axisStart>0.0</axisStart><beamShape>rectangular</beamShape><beamSizeAtSampleX>100.0</beamSizeAtSampleX><beamSizeAtSampleY>100.0</beamSizeAtSampleY><dataCollectionId>39878</dataCollectionId><dataCollectionNumber>1</dataCollectionNumber><detector2theta>0.0</detector2theta><detectorDistance>296.869</detectorDistance><endTime>2018-11-21T16:54:18+01:00</endTime><exposureTime>0.025</exposureTime><fileTemplate>C2-BZ1692_1</fileTemplate><flux>1.27E10</flux><flux_end>1.27E10</flux_end><imageDirectory>/data4/proxima1-soleil/2018_Run5/2018-11-21/20180897/RAW_DATA/C2/C2-BZ1692</imageDirectory><imagePrefix>C2-BZ1692</imagePrefix><imageSuffix>h5</imageSuffix><kappaStart>0.0</kappaStart><numberOfImages>1800</numberOfImages><numberOfPasses>1</numberOfPasses><overlap>0.0</overlap><phiStart>0.0</phiStart><printableForReport>1</printableForReport><resolution>1.99996</resolution><rotationAxis>Phi</rotationAxis><runStatus>Data collection successful</runStatus><slitGapHorizontal>9999.0</slitGapHorizontal><slitGapVertical>9999.0</slitGapVertical><startImageNumber>1</startImageNumber><startTime>2018-11-21T16:52:42+01:00</startTime><synchrotronMode>Hybrid</synchrotronMode><transmission>20.1</transmission><undulatorGap1>6.4649</undulatorGap1><wavelength>0.978566</wavelength><xbeam>2044.1</xbeam><ybeam>2291.12</ybeam><dataCollectionGroupId>41587</dataCollectionGroupId></dataCollection></ns2:findDataCollectionResponse></soap:Body></soap:Envelope>
*** Exception (reporting due to +RTS -xc): (THUNK_1_0), stack trace: 
  Data.Conduit.Internal.Conduit.fmap.\,
  called from Data.Conduit.Internal.Conduit.fmap,
  called from Network.SOAP.Parsing.Stream.readContent,
  called from Network.SOAP.Parsing.Stream.readTag,
  called from ISPyB.Soap.toResponseParser,
  called from Data.Conduit.Internal.Conduit.pure,
  called from Data.Conduit.Internal.Conduit.>>=.\.\,
  called from Data.Conduit.Internal.Conduit.>>=.\,
  called from Data.Conduit.Internal.Conduit.>>=,
  called from Text.XML.Stream.Parse.force,
  called from Network.SOAP.unwrapEnvelopeSink,
  called from Network.SOAP.runResponseParser,
  called from Network.SOAP.invokeWS,
  called from ISPyB.Soap.callISPyBService,
  called from XdsMe.xdsme,
  called from JobParser.runJob,
  called from Main.run,
  called from Main.main
autoprocessing-exe: Prelude.read: no parse
CallStack (from -prof):
  Data.Conduit.Internal.Conduit.fmap.\ (src/Data/Conduit/Internal/Conduit.hs:140:47-58)
  Data.Conduit.Internal.Conduit.fmap (src/Data/Conduit/Internal/Conduit.hs:140:5-58)
  Network.SOAP.Parsing.Stream.readContent (src/Network/SOAP/Parsing/Stream.hs:57:1-46)
  Network.SOAP.Parsing.Stream.readTag (src/Network/SOAP/Parsing/Stream.hs:61:1-33)
  ISPyB.Soap.toResponseParser (src/ISPyB/Soap.hs:(65,5)-(129,74))
  Data.Conduit.Internal.Conduit.pure (src/Data/Conduit/Internal/Conduit.hs:143:5-27)
  Data.Conduit.Internal.Conduit.>>=.\.\ (src/Data/Conduit/Internal/Conduit.hs:150:51-68)
  Data.Conduit.Internal.Conduit.>>=.\ (src/Data/Conduit/Internal/Conduit.hs:150:41-68)
  Data.Conduit.Internal.Conduit.>>= (src/Data/Conduit/Internal/Conduit.hs:150:5-68)
  Text.XML.Stream.Parse.force (Text/XML/Stream/Parse.hs:873:1-68)
  Network.SOAP.unwrapEnvelopeSink (src/Network/SOAP.hs:(79,1)-(81,30))
  Network.SOAP.runResponseParser (src/Network/SOAP.hs:(61,1)-(76,31))
  Network.SOAP.invokeWS (src/Network/SOAP.hs:(55,1)-(58,27))
  ISPyB.Soap.callISPyBService (src/ISPyB/Soap.hs:(310,1)-(325,93))
  XdsMe.xdsme (src/XdsMe.hs:(176,1)-(179,77))
  JobParser.runJob (src/JobParser.hs:(80,1)-(84,57))
  Main.run (app/Main.hs:(112,1)-(114,31))
  Main.main (app/Main.hs:(118,1)-(123,72))


I generate the stacktrace with  RTS.

but now I know theat my error is in the roRespondParser whcih is quite long

here the code


instance a ~ b => ToResponseParser (ToolsForCollectionWebService a) b where
    toResponseParser (FindDataCollection _) =
        StreamParser . flaxTag "findDataCollectionResponse" . flaxTag "dataCollection" $
        mkSomeDataCollection <$>
                     ( DataCollection
                       <$> flaxContent "actualCenteringPosition"
                       <*> readTag "axisEnd"
                       <*> readTag "axisRange"
                       <*> readTag "axisStart"
                       <*> flaxContent "beamShape"
                       <*> readTag "beamSizeAtSampleX"
                       <*> readTag "beamSizeAtSampleY"
                       <*> laxTag "centeringMethod" readContent
                       <*> (DataCollectionId <$> readTag "dataCollectionId")
                       <*> readTag "dataCollectionNumber"
                       <*> readTag "detector2theta"
                       <*> readTag "detectorDistance"
                       <*> flaxContent "endTime"
                       <*> readTag "exposureTime"
                       <*> flaxContent "fileTemplate"
                       <*> readTag "flux"
                       <*> readTag "flux_end"
                       <*> flaxTag "imageDirectory" parseAbsDir'
                       <*> flaxContent "imagePrefix"
                       <*> laxContent "imageSuffix"
                       <*> readTag "kappaStart"
                       <*> readTag "numberOfImages"
                       <*> readTag "numberOfPasses"
                       <*> laxTag "omegaStart" readContent
                       <*> readTag "overlap"
                       <*> readTag "phiStart"
                       <*> readTag "printableForReport"
                       <*> readTag "resolution"
                       <*> laxTag "resolutionAtCorner" readContent
                       <*> readTag "rotationAxis"
                       <*> flaxContent "runStatus"
                       <*> readTag "slitGapHorizontal"
                       <*> readTag "slitGapVertical"
                       <*> readTag "startImageNumber"
                       <*> readTag "startTime"
                       <*> readTag "synchrotronMode"
                       <*> readTag "transmission"
                       <*> readTag "undulatorGap1"
                       <*> laxTag "undulatorGap2" readContent
                       <*> readTag "wavelength" -- add the unit
                       <*> readTag "xbeam"
                       <*> laxTag "xtalSnapshotFullPath1" parseAbsFile'
                       <*> laxTag "xtalSnapshotFullPath2" parseAbsFile'
                       <*> laxTag "xtalSnapshotFullPath3" parseAbsFile'
                       <*> laxTag "xtalSnapshotFullPath4" parseAbsFile'
                       <*> readTag "ybeam"
                       <*> readTag "dataCollectionGroupId"
                     )


Now I would like to know whcih line is problematic. Is it possible to have more information when debuging ?

I really want to know which part of my response is wrong ?

thansk for your advices.

Frederic