[MapServer-users] [EXTERNAL] Vector tileindex with connectiontype OGR

[Peter Schmitt]

On Wed, Dec 7, 2022 at 1:16 AM Schylberg Lars <lars.schylberg at saabgroup.com>
wrote:
> The important thing is to have a one layer for the actual tile index,
that has status off and one layer that is using the tile index layer.

Thanks for the message, Lars!  This gave me another idea to debug.

When I set DEBUG 5 and request

     mapserv -nh
QUERY_STRING='service=WFS&VERSION=1.0.0&REQUEST=getfeature&map=/app/mapfiles/test2.map&typename=vector_via_ogr&OUTPUTFORMAT=geojson'

then the log contains

    OGROPen(tindex_ogr)
    msOGRFileOpen(): OGR error. Open failed for OGR connection in layer
`vector_via_ogr'.  File not found or unsupported format. Check server logs.
    Open failed for OGR connection in layer `vector_via_ogr'.

with the layers
    LAYER
        DEBUG 5
        NAME "tindex_ogr"
        TYPE POLYGON
        CONNECTIONTYPE OGR
        CONNECTION "/app/mapfiles/tindex.geojson"
        STATUS OFF
    END

    LAYER
        DEBUG 5
        NAME "vector_via_ogr"
        TYPE POLYGON
        TILEINDEX tindex_ogr
        CONNECTIONTYPE OGR
        STATUS OFF
    END

This log line

        OGROPen(tindex_ogr)

makes me suspect the following lines of code are setting the OGR dataset
name to "tindex_ogr", whereas I expect it to do something like use the
value from CONNECTION in the layer with name "tindex_ogr".
https://github.com/MapServer/MapServer/blob/71ecf4028b0769027df3a970a36d56feb1d46ab6/mapogr.cpp#L1205-L1238

In other words, I expect the log line to read

        OGROPen(/app/mapfiles/tindex.geojson)

and not

        OGROPen(tindex_ogr)

This seems to be unique for a vector tile index of vectors.  This otherwise
works fine when using a vector tileindex of rasters.  So if I make a bogus
raster layer like

    LAYER
        DEBUG 5
        NAME "bogus_raster"
        TYPE RASTER
        TILEINDEX tindex_ogr
        STATUS OFF
        PROJECTION
            "init=epsg:3857"
        END
    END

and then issue a bogus request like

    curl '
http://localhost:8000/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image/png&TRANSPARENT=true&map=/app/mapfiles/test2.map&layers=bogus_raster&WIDTH=256&HEIGHT=256&CRS=EPSG:3857&STYLES=&BBOX=4163066.308523841,5943743.319455305,4167958.2783340923,5948635.289265556
'

Then the log line includes

     msOGRFileOpen(/app/mapfiles/tindex.geojson)...
     OGROPen(/app/mapfiles/tindex.geojson)

 msConnPoolRegister(tindex_ogr,/app/mapfiles/tindex.geojson,0x556aba222630)

and _not_

     msOGRFileOpen(tindex_ogr)...

like I see for a vector tile index of vectors.

Thanks, Pete
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