[mapserver-dev] Communicating Tile Coordinates Between Mapcache and Mapserver

[seandisanti]

I have a page that currently successfully requests tiles from Mapserver
6.0.3. The working request looks like: 
"?map=/map/ahps/precip.map&shape_path=2015/06/23/nws_precip_1day_observed_20150623&mode=tile&tilemode=gmap&service=WMS&version=1.1.1&request=GetMap&Styles=default&SRS=EPSG:102100&width=256&height=256&format=image/PNG&TRANSPARENT=TRUE&layers=conus-raster&dpi=120&tile=3+5+4"

The layer is defined in the map file like:

        LAYER
                NAME 'conus-raster'
                TYPE RASTER
                STATUS DEFAULT
                PROJECTION
                        "init=epsg:4326"
                END
                VALIDATION
                        "shape_path"    
"^[0-9]{4}\/[0-9]{2}\/[0-9]{2}\/nws_precip_.*_[a-zA-Z]+_[0-9]{8}"
                END
                DATA "/shp/ahps/%shape_path%_conus.png"
        END

The decision has been made to use mapcache rather than querying mapserver
directly, and I've set up a source and tileset (I will include below) but I
am consistently running into errors. I have tried WMS and WMTS services
because I need to use a dimension to pass the shape_path variable, but if I
specify tile as a dimension, the regex requires me to treat the pluses in
the value as spaces, but then it passes the literal string (with pluses) to
mapserver. Mapserver returns an error that there are the wrong number of
coordinates, that there should be 3.

Any help would be greatly appreciated, the only thing stopping me from going
in and modifying the source to split on plus or space is that I wouldn't be
able to recompile mapserver in our production environment.

The source in my config file is: 
   <source name="precip_conus" type="wms">
      <getmap>
         <params>
            <map>/map/ahps/precip.map</map>
            <version>1.3.0</version>
            <SRS>EPSG:3857</SRS>
            <CRS>EPSG:3857</CRS>
			<SRS>EPSG:102100</SRS>
			<CRS>EPSG:102100</CRS>
            <TRANSPARENT>TRUE</TRANSPARENT>
            <FORMAT>image/png</FORMAT>
            <LAYERS>conus-raster</LAYERS>
			<MODE>TILE</MODE>
			<TILEMODE>gmap</TILEMODE>
         </params>
      </getmap>
      <http>
         <url>url_to_mapserver</url>
         <headers>
            <User-Agent>mod_mapcache/r175</User-Agent>
            <Referrer>url_to_mapcache</Referrer>
         </headers>
         <connection_timeout>10</connection_timeout>
	  </http>
   </source>

and the tileset is:
   <tileset name="precip_conus">
      <source>precip_conus</source>
	  <LAYER>conus-raster</LAYER>
      <cache>precip_cache</cache>
      <grid>g2</grid>
      <format>PNG</format>
      <dimensions>
         <dimension type="regex" name="shape_path"
default="2015/01/01/nws_precip_1day_observed_20150101">^[0-9]{4}\/[0-9]{2}\/[0-9]{2}\/nws_precip_.*_[a-zA-Z]+_[0-9]{8}$</dimension>
		 <dimension type="regex" name="tile"
default="3+5+4">^\d{1,3}\s\d{1,3}\s\d{1,3}$</dimension>
      </dimensions>
   </tileset>




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