[Mapserver-users] Tricky bug: any hints ?

[Daniel FAIVRE]

Hello,

I've faced a tricky bug with some PostGIS layers and MapServer. I'm 
using MapServer from CVS (040213), php mapscript, php 4.3.4, and 
PostgreSQL 7.4 on a Debian woody.

I've got a postgis layer with 50000 streets (no dump joined, see table 
def at the end of this message). These layer is a MULTILINESTRING layer, 
with simple and valids geometries with  1 as numgeometries  (all 
geometries are LINESTRINGs).

When I try to classify this layer as reported below, I get a bug 
(Probably a MapServer one). Nothing is reported by PostGreSQL debug, 
except a  "LOG:  08P01: unexpected EOF on client connection" ...
Apache only report:  [Thu Feb 19 16:51:38 2004] [error] [client 
127.0.0.1] Premature end of script headers: /usr/lib/cgi-bin/php

The bug seem to relate to multiple styles for one class.

Here is a mapfile extraction, with comments about how to produce or 
avoid the bug:

LAYER               
  NAME "streets"
  TYPE LINE
  CONNECTIONTYPE postgis
  CONNECTION "user=my_user_name dbname=my_db_name"
  DATA "the_geom from streets"
  STATUS ON
  TRANSPARENCY 80
  TEMPLATE "ttt"
  HEADER "link_id st_name"  
  CLASSITEM "route_type"
  CLASS
    EXPRESSION /[123]/
    NAME "Routes principales" 
    STYLE
      COLOR 64 0 0
      SYMBOL "line1"
      SIZE 5   
    END
    STYLE
      COLOR 255 196 0
      SYMBOL "line2"
      SIZE 3   
    END   
    LABEL
      ANTIALIAS true
      ANGLE AUTO
      FONT verdana
      MINDISTANCE 1
      BUFFER 20
      TYPE truetype
      COLOR 0 0 0
      OUTLINECOLOR 255 255 255
      SIZE 6
      MINSIZE 6
      MAXSIZE 10
      POSITION auto
    END    
  END
  CLASS
    EXPRESSION "4"
    NAME "Routes secondaires" 
    STYLE
      COLOR 64 0 0
      SYMBOL "line1"
      SIZE 4   
    END
    STYLE
      COLOR 255 64 0
      SYMBOL "line2"
      SIZE 2   
    END
    LABEL
      ANTIALIAS true
      ANGLE AUTO
      FONT verdana
      MINDISTANCE 1
      BUFFER 20
      TYPE truetype
      COLOR 0 0 0
      OUTLINECOLOR 255 255 255     
      SIZE 6
      MINSIZE 6
      MAXSIZE 8
      POSITION auto
    END    
  END
  CLASS
    NAME "Autres"
    EXPRESSION /[95]/
    STYLE
      COLOR 96 96 96
      SYMBOL "line1"
      SIZE 2   
    END
#    STYLE                # second style commented to avoid the bug with 
type 9: no bug with this part commented
#      COLOR 64 255 0
#      SYMBOL "line2"
#      SIZE 1   
#    END
  END   
  TOLERANCE 5
  TOLERANCEUNITS pixels
END

When the commented part is uncommented, the bug happens. In this case, 
when  EXPRESSION /[95]/ is replaced by EXPRESSION /5/, no bug happens ...
Furthermore, when I start my application with the commented part, make a 
zoom, and a query, I can uncomment this style part aned refresh my page 
without a bug !

I've search about something related to my data set, but I could not have 
found anything. All my LINESTRING GEOMETRIES are simples, valid, and 
report 1 as numgeometries ...

Does anybody see any hint ? Is it really a MapServer bug related to 
multiple styles on the same line ?

Best regards,
Daniel FAIVRE

Here is my very simple table def:

CREATE TABLE public.streets
(
  link_id int8,
  st_name varchar,
  route_type varchar,
  the_geom public.geometry,
  CONSTRAINT "$1" CHECK srid(the_geom) = -1,
  CONSTRAINT "$2" CHECK geometrytype(the_geom) = 'MULTILINESTRING'::text 
OR the_geom IS NULL
) WITH OIDS;