Designing a wrapper around mapserv which can be used with fcgi
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Adrian Popa
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Hello everyone,
I am currently using a wrapper around mapserv which receives the URL parameters, builds the map file (actually I only need to set some filters in the map file, but the filters need to be built after running some SQL queries with the passed in parameters). After the map file is built, mapserv is called (as a shell script), and the map gets sent to the user. Currently this wrapper is written in perl - so it's not terribly fast as a cgi process. While this approach works, it is terribly inefficient. I would like to use mapserv as a fcgi process (or something faster than plain cgi). My question is - how can I /should I build a wrapper around mapserv that can "customize" the MAP file on the fly and run as a fcgi process? Any ideas on where I should start? An example of such a wrapper? Also, I suspect I can send parameters to mapserver and use some sort of variables in the map file to set up my filters - but I haven't seen an example. Can someone point me to such a documentation? Thanks, Adrian _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Andy Colson
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Adrian Popa wrote:
> Hello everyone, > > I am currently using a wrapper around mapserv which receives the URL > parameters, builds the map file (actually I only need to set some > filters in the map file, but the filters need to be built after running > some SQL queries with the passed in parameters). After the map file is > built, mapserv is called (as a shell script), and the map gets sent to > the user. Currently this wrapper is written in perl - so it's not > terribly fast as a cgi process. > > While this approach works, it is terribly inefficient. I would like to > use mapserv as a fcgi process (or something faster than plain cgi). My > question is - how can I /should I build a wrapper around mapserv that > can "customize" the MAP file on the fly and run as a fcgi process? > > Any ideas on where I should start? An example of such a wrapper? > > Also, I suspect I can send parameters to mapserver and use some sort of > variables in the map file to set up my filters - but I haven't seen an > example. Can someone point me to such a documentation? > > Thanks, > Adrian Have you seen mapscript? You can use mapserver directly from perl. And perl can do fast-cgi. Here is a little, ad-hoc, non-tested, perl fcgi: #!/usr/bin/perl use strict; use mapscript; use FCGI; my $request = FCGI::Request( ); while($request->Accept() >= 0) { my($req, $x, $at, $xmap, $xpin, $sid, $y, $q); $req = new mapscript::OWSRequest(); $req->loadParams(); $xmap = $req->getValueByName('map'); $xpin = $req->getValueByName('pin'); my $map = new mapscript::mapObj( "/maps/$xmap.map" ); if (! $map) { #print STDERR "----- Error loading map: $xmap.map\n"; print("Content-type: text/text\r\n\r\n"); print "cant load $xmap.map"; $request->Finish(); next; } mapscript::msIO_installStdoutToBuffer(); $x = $map->OWSDispatch( $req ); if ($x) { print STDERR "OWSDispatch: $x\n"; my $errObj = new mapscript::errorObj(); while ($errObj) { print STDERR "ERROR: $errObj->{code}:$errObj->{message}:$errObj->{routine} \n"; $errObj = $errObj->next(); } } my $content_type = mapscript::msIO_stripStdoutBufferContentType(); $x = mapscript::msIO_getStdoutBufferBytes(); print("Content-type: $content_type\r\n\r\n"); if (mapscript::msGetVersionInt() >= 50500) { print $$x; } else { print $x; } mapscript::msIO_resetHandlers(); $request->Finish(); } I'd recommend using mapserver 5.6.0. -Andy _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Adrian Popa
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Thank you,
I will look into it. I guess through mapscript I can redefine the parameters that get sent to mapserver? Or do I rewrite the whole map? Andy Colson wrote: > Adrian Popa wrote: >> Hello everyone, >> >> I am currently using a wrapper around mapserv which receives the URL >> parameters, builds the map file (actually I only need to set some >> filters in the map file, but the filters need to be built after >> running some SQL queries with the passed in parameters). After the >> map file is built, mapserv is called (as a shell script), and the map >> gets sent to the user. Currently this wrapper is written in perl - so >> it's not terribly fast as a cgi process. >> >> While this approach works, it is terribly inefficient. I would like >> to use mapserv as a fcgi process (or something faster than plain >> cgi). My question is - how can I /should I build a wrapper around >> mapserv that can "customize" the MAP file on the fly and run as a >> fcgi process? >> >> Any ideas on where I should start? An example of such a wrapper? >> >> Also, I suspect I can send parameters to mapserver and use some sort >> of variables in the map file to set up my filters - but I haven't >> seen an example. Can someone point me to such a documentation? >> >> Thanks, >> Adrian > > Have you seen mapscript? You can use mapserver directly from perl. > And perl can do fast-cgi. Here is a little, ad-hoc, non-tested, perl > fcgi: > > > #!/usr/bin/perl > > use strict; > use mapscript; > use FCGI; > > > my $request = FCGI::Request( ); > while($request->Accept() >= 0) > { > my($req, $x, $at, $xmap, $xpin, $sid, $y, $q); > > $req = new mapscript::OWSRequest(); > $req->loadParams(); > > $xmap = $req->getValueByName('map'); > $xpin = $req->getValueByName('pin'); > > my $map = new mapscript::mapObj( "/maps/$xmap.map" ); > if (! $map) > { > #print STDERR "----- Error loading map: $xmap.map\n"; > print("Content-type: text/text\r\n\r\n"); > print "cant load $xmap.map"; > $request->Finish(); > next; > } > > mapscript::msIO_installStdoutToBuffer(); > > $x = $map->OWSDispatch( $req ); > if ($x) > { > print STDERR "OWSDispatch: $x\n"; > my $errObj = new mapscript::errorObj(); > while ($errObj) { > print STDERR "ERROR: > $errObj->{code}:$errObj->{message}:$errObj->{routine} \n"; > $errObj = $errObj->next(); > } > } > > my $content_type = > mapscript::msIO_stripStdoutBufferContentType(); > > $x = mapscript::msIO_getStdoutBufferBytes(); > > > print("Content-type: $content_type\r\n\r\n"); > if (mapscript::msGetVersionInt() >= 50500) > { > print $$x; > } else { > print $x; > } > > mapscript::msIO_resetHandlers(); > $request->Finish(); > } > > > > I'd recommend using mapserver 5.6.0. > > -Andy > _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Andy Colson
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> Andy Colson wrote:
>> Adrian Popa wrote: >>> Hello everyone, >>> >>> I am currently using a wrapper around mapserv which receives the URL >>> parameters, builds the map file (actually I only need to set some >>> filters in the map file, but the filters need to be built after >>> running some SQL queries with the passed in parameters). After the >>> map file is built, mapserv is called (as a shell script), and the map >>> gets sent to the user. Currently this wrapper is written in perl - so >>> it's not terribly fast as a cgi process. >>> >>> While this approach works, it is terribly inefficient. I would like >>> to use mapserv as a fcgi process (or something faster than plain >>> cgi). My question is - how can I /should I build a wrapper around >>> mapserv that can "customize" the MAP file on the fly and run as a >>> fcgi process? >>> >>> Any ideas on where I should start? An example of such a wrapper? >>> >>> Also, I suspect I can send parameters to mapserver and use some sort >>> of variables in the map file to set up my filters - but I haven't >>> seen an example. Can someone point me to such a documentation? >>> >>> Thanks, >>> Adrian >> >> Have you seen mapscript? You can use mapserver directly from perl. >> And perl can do fast-cgi. Here is a little, ad-hoc, non-tested, perl >> fcgi: >> >> >> #!/usr/bin/perl >> >> use strict; >> use mapscript; >> use FCGI; >> >> >> my $request = FCGI::Request( ); >> while($request->Accept() >= 0) >> { >> my($req, $x, $at, $xmap, $xpin, $sid, $y, $q); >> >> $req = new mapscript::OWSRequest(); >> $req->loadParams(); >> >> $xmap = $req->getValueByName('map'); >> $xpin = $req->getValueByName('pin'); >> >> my $map = new mapscript::mapObj( "/maps/$xmap.map" ); >> if (! $map) >> { >> #print STDERR "----- Error loading map: $xmap.map\n"; >> print("Content-type: text/text\r\n\r\n"); >> print "cant load $xmap.map"; >> $request->Finish(); >> next; >> } >> >> mapscript::msIO_installStdoutToBuffer(); >> >> $x = $map->OWSDispatch( $req ); >> if ($x) >> { >> print STDERR "OWSDispatch: $x\n"; >> my $errObj = new mapscript::errorObj(); >> while ($errObj) { >> print STDERR "ERROR: >> $errObj->{code}:$errObj->{message}:$errObj->{routine} \n"; >> $errObj = $errObj->next(); >> } >> } >> >> my $content_type = >> mapscript::msIO_stripStdoutBufferContentType(); >> >> $x = mapscript::msIO_getStdoutBufferBytes(); >> >> >> print("Content-type: $content_type\r\n\r\n"); >> if (mapscript::msGetVersionInt() >= 50500) >> { >> print $$x; >> } else { >> print $x; >> } >> >> mapscript::msIO_resetHandlers(); >> $request->Finish(); >> } >> >> >> >> I'd recommend using mapserver 5.6.0. >> >> -Andy >> > Adrian Popa wrote: > Thank you, > > I will look into it. I guess through mapscript I can redefine the > parameters that get sent to mapserver? Or do I rewrite the whole map? > You can load a map into memory (I assume you were already doing that). You said "..perl.. receives the URL parameters ...and... builds the map file". I assume your perl does: use mapscript? and at some point: my $map = new mapscript::mapObj( "/maps/$xmap.map" ); You kind of imbed mapserver into your perl script, and can call its functions and what not. After you load the map you can do things to it, in memory. In my example above, I'm using the WMS features ($map->OWSDispatch), but you can also generate an image: my $img = $map->draw(); $img->save('x.jpg', $mapscript::MS_JPG); -Andy _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Adrian Popa
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Thank you Andy for explaining.
Actually my wrapper is very hard-core, meaning I don't use mapscript (because I had to build it quickly and didn't have time to research which was the best approach). Now I have more time and I'd like to tune things up, so I will definitely start studying mapscript (If you have a link to a good tutorial/function reference for it I am in your debt). My wrapper just copied over a template map file, edited it (rewrites some filters) and then it set $ENV{'QUERY_STRING'} = $ENV{'QUERY_STRING'}."&map=$file"; ...and then called print `/var/www/cgi-bin/mapserv`; It's barbaric, I know, but it worked for me. :) It will take a bit of rewrite to add fcgi support and mapscript, but in the long run it will be more mantainable... :) Thanks again, Adrian Andy Colson wrote: >> Andy Colson wrote: >>> Adrian Popa wrote: >>>> Hello everyone, >>>> >>>> I am currently using a wrapper around mapserv which receives the >>>> URL parameters, builds the map file (actually I only need to set >>>> some filters in the map file, but the filters need to be built >>>> after running some SQL queries with the passed in parameters). >>>> After the map file is built, mapserv is called (as a shell script), >>>> and the map gets sent to the user. Currently this wrapper is >>>> written in perl - so it's not terribly fast as a cgi process. >>>> >>>> While this approach works, it is terribly inefficient. I would like >>>> to use mapserv as a fcgi process (or something faster than plain >>>> cgi). My question is - how can I /should I build a wrapper around >>>> mapserv that can "customize" the MAP file on the fly and run as a >>>> fcgi process? >>>> >>>> Any ideas on where I should start? An example of such a wrapper? >>>> >>>> Also, I suspect I can send parameters to mapserver and use some >>>> sort of variables in the map file to set up my filters - but I >>>> haven't seen an example. Can someone point me to such a documentation? >>>> >>>> Thanks, >>>> Adrian >>> >>> Have you seen mapscript? You can use mapserver directly from perl. >>> And perl can do fast-cgi. Here is a little, ad-hoc, non-tested, >>> perl fcgi: >>> >>> >>> #!/usr/bin/perl >>> >>> use strict; >>> use mapscript; >>> use FCGI; >>> >>> >>> my $request = FCGI::Request( ); >>> while($request->Accept() >= 0) >>> { >>> my($req, $x, $at, $xmap, $xpin, $sid, $y, $q); >>> >>> $req = new mapscript::OWSRequest(); >>> $req->loadParams(); >>> >>> $xmap = $req->getValueByName('map'); >>> $xpin = $req->getValueByName('pin'); >>> >>> my $map = new mapscript::mapObj( "/maps/$xmap.map" ); >>> if (! $map) >>> { >>> #print STDERR "----- Error loading map: $xmap.map\n"; >>> print("Content-type: text/text\r\n\r\n"); >>> print "cant load $xmap.map"; >>> $request->Finish(); >>> next; >>> } >>> >>> mapscript::msIO_installStdoutToBuffer(); >>> >>> $x = $map->OWSDispatch( $req ); >>> if ($x) >>> { >>> print STDERR "OWSDispatch: $x\n"; >>> my $errObj = new mapscript::errorObj(); >>> while ($errObj) { >>> print STDERR "ERROR: >>> $errObj->{code}:$errObj->{message}:$errObj->{routine} \n"; >>> $errObj = $errObj->next(); >>> } >>> } >>> >>> my $content_type = >>> mapscript::msIO_stripStdoutBufferContentType(); >>> >>> $x = mapscript::msIO_getStdoutBufferBytes(); >>> >>> >>> print("Content-type: $content_type\r\n\r\n"); >>> if (mapscript::msGetVersionInt() >= 50500) >>> { >>> print $$x; >>> } else { >>> print $x; >>> } >>> >>> mapscript::msIO_resetHandlers(); >>> $request->Finish(); >>> } >>> >>> >>> >>> I'd recommend using mapserver 5.6.0. >>> >>> -Andy >>> >> > > Adrian Popa wrote: > > Thank you, > > > > I will look into it. I guess through mapscript I can redefine the > > parameters that get sent to mapserver? Or do I rewrite the whole map? > > > > > You can load a map into memory (I assume you were already doing that). > You said "..perl.. receives the URL parameters ...and... builds the > map file". > > > I assume your perl does: use mapscript? > > and at some point: my $map = new mapscript::mapObj( "/maps/$xmap.map" ); > > You kind of imbed mapserver into your perl script, and can call its > functions and what not. After you load the map you can do things to > it, in memory. > > In my example above, I'm using the WMS features ($map->OWSDispatch), > but you can also generate an image: > > my $img = $map->draw(); > $img->save('x.jpg', $mapscript::MS_JPG); > > -Andy > -- --- Adrian Popa NOC Division Network Engineer Divizia Centrul National de Operare Retea Departament Transport IP & Metro Compartiment IP Core & Backbone Phone: +40 21 400 3099 _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Andy Colson
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>
> Andy Colson wrote: >>> Andy Colson wrote: >>>> Adrian Popa wrote: >>>>> Hello everyone, >>>>> >>>>> I am currently using a wrapper around mapserv which receives the >>>>> URL parameters, builds the map file (actually I only need to set >>>>> some filters in the map file, but the filters need to be built >>>>> after running some SQL queries with the passed in parameters). >>>>> After the map file is built, mapserv is called (as a shell script), >>>>> and the map gets sent to the user. Currently this wrapper is >>>>> written in perl - so it's not terribly fast as a cgi process. >>>>> >>>>> While this approach works, it is terribly inefficient. I would like >>>>> to use mapserv as a fcgi process (or something faster than plain >>>>> cgi). My question is - how can I /should I build a wrapper around >>>>> mapserv that can "customize" the MAP file on the fly and run as a >>>>> fcgi process? >>>>> >>>>> Any ideas on where I should start? An example of such a wrapper? >>>>> >>>>> Also, I suspect I can send parameters to mapserver and use some >>>>> sort of variables in the map file to set up my filters - but I >>>>> haven't seen an example. Can someone point me to such a documentation? >>>>> >>>>> Thanks, >>>>> Adrian >>>> >>>> Have you seen mapscript? You can use mapserver directly from perl. >>>> And perl can do fast-cgi. Here is a little, ad-hoc, non-tested, >>>> perl fcgi: >>>> >>>> >>>> #!/usr/bin/perl >>>> >>>> use strict; >>>> use mapscript; >>>> use FCGI; >>>> >>>> >>>> my $request = FCGI::Request( ); >>>> while($request->Accept() >= 0) >>>> { >>>> my($req, $x, $at, $xmap, $xpin, $sid, $y, $q); >>>> >>>> $req = new mapscript::OWSRequest(); >>>> $req->loadParams(); >>>> >>>> $xmap = $req->getValueByName('map'); >>>> $xpin = $req->getValueByName('pin'); >>>> >>>> my $map = new mapscript::mapObj( "/maps/$xmap.map" ); >>>> if (! $map) >>>> { >>>> #print STDERR "----- Error loading map: $xmap.map\n"; >>>> print("Content-type: text/text\r\n\r\n"); >>>> print "cant load $xmap.map"; >>>> $request->Finish(); >>>> next; >>>> } >>>> >>>> mapscript::msIO_installStdoutToBuffer(); >>>> >>>> $x = $map->OWSDispatch( $req ); >>>> if ($x) >>>> { >>>> print STDERR "OWSDispatch: $x\n"; >>>> my $errObj = new mapscript::errorObj(); >>>> while ($errObj) { >>>> print STDERR "ERROR: >>>> $errObj->{code}:$errObj->{message}:$errObj->{routine} \n"; >>>> $errObj = $errObj->next(); >>>> } >>>> } >>>> >>>> my $content_type = >>>> mapscript::msIO_stripStdoutBufferContentType(); >>>> >>>> $x = mapscript::msIO_getStdoutBufferBytes(); >>>> >>>> >>>> print("Content-type: $content_type\r\n\r\n"); >>>> if (mapscript::msGetVersionInt() >= 50500) >>>> { >>>> print $$x; >>>> } else { >>>> print $x; >>>> } >>>> >>>> mapscript::msIO_resetHandlers(); >>>> $request->Finish(); >>>> } >>>> >>>> >>>> >>>> I'd recommend using mapserver 5.6.0. >>>> >>>> -Andy >>>> >>> >> >> Adrian Popa wrote: >> > Thank you, >> > >> > I will look into it. I guess through mapscript I can redefine the >> > parameters that get sent to mapserver? Or do I rewrite the whole map? >> > >> >> >> You can load a map into memory (I assume you were already doing that). >> You said "..perl.. receives the URL parameters ...and... builds the >> map file". >> >> >> I assume your perl does: use mapscript? >> >> and at some point: my $map = new mapscript::mapObj( "/maps/$xmap.map" ); >> >> You kind of imbed mapserver into your perl script, and can call its >> functions and what not. After you load the map you can do things to >> it, in memory. >> >> In my example above, I'm using the WMS features ($map->OWSDispatch), >> but you can also generate an image: >> >> my $img = $map->draw(); >> $img->save('x.jpg', $mapscript::MS_JPG); >> >> -Andy >> > > Adrian Popa wrote: > Thank you Andy for explaining. > > Actually my wrapper is very hard-core, meaning I don't use mapscript > (because I had to build it quickly and didn't have time to research > which was the best approach). Now I have more time and I'd like to tune > things up, so I will definitely start studying mapscript (If you have a > link to a good tutorial/function reference for it I am in your debt). > > My wrapper just copied over a template map file, edited it (rewrites > some filters) and then it set > $ENV{'QUERY_STRING'} = $ENV{'QUERY_STRING'}."&map=$file"; > > ...and then called > > print `/var/www/cgi-bin/mapserv`; > > > It's barbaric, I know, but it worked for me. :) > It will take a bit of rewrite to add fcgi support and mapscript, but in > the long run it will be more mantainable... :) > > Thanks again, > Adrian So are you using the template html stuff? Humm... I've never used that stuff, not sure how it'll all translate. For documentation, I used the mapscript reference: http://mapserver.org/mapscript/mapscript.html I found a few example perl scripts that helped with the syntax (my $c = new mapscript::colorObj(), $c->{blue} = 255;, etc...). Other than that, I had more problems comming up with nice looking colors for my map, than actually writing the perl code. -Andy _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Dan Little
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If you can you might want to consider python... the syntax is a little cleaner with Mapscript. Of course, that's an opinion but I also am a little allergic to sigils (I get all itchy).
----- Original Message ---- > From: Andy Colson <[hidden email]> > To: Adrian Popa <[hidden email]> > Cc: [hidden email] > Sent: Wed, November 4, 2009 8:38:52 AM > Subject: Re: [mapserver-users] Designing a wrapper around mapserv which can be used with fcgi > > > > > Andy Colson wrote: > >>> Andy Colson wrote: > >>>> Adrian Popa wrote: > >>>>> Hello everyone, > >>>>> > >>>>> I am currently using a wrapper around mapserv which receives the URL > parameters, builds the map file (actually I only need to set some filters in the > map file, but the filters need to be built after running some SQL queries with > the passed in parameters). After the map file is built, mapserv is called (as a > shell script), and the map gets sent to the user. Currently this wrapper is > written in perl - so it's not terribly fast as a cgi process. > >>>>> > >>>>> While this approach works, it is terribly inefficient. I would like to use > mapserv as a fcgi process (or something faster than plain cgi). My question is - > how can I /should I build a wrapper around mapserv that can "customize" the MAP > file on the fly and run as a fcgi process? > >>>>> > >>>>> Any ideas on where I should start? An example of such a wrapper? > >>>>> > >>>>> Also, I suspect I can send parameters to mapserver and use some sort of > variables in the map file to set up my filters - but I haven't seen an example. > Can someone point me to such a documentation? > >>>>> > >>>>> Thanks, > >>>>> Adrian > >>>> > >>>> Have you seen mapscript? You can use mapserver directly from perl. And > perl can do fast-cgi. Here is a little, ad-hoc, non-tested, perl fcgi: > >>>> > >>>> > >>>> #!/usr/bin/perl > >>>> > >>>> use strict; > >>>> use mapscript; > >>>> use FCGI; > >>>> > >>>> > >>>> my $request = FCGI::Request( ); > >>>> while($request->Accept() >= 0) > >>>> { > >>>> my($req, $x, $at, $xmap, $xpin, $sid, $y, $q); > >>>> > >>>> $req = new mapscript::OWSRequest(); > >>>> $req->loadParams(); > >>>> > >>>> $xmap = $req->getValueByName('map'); > >>>> $xpin = $req->getValueByName('pin'); > >>>> > >>>> my $map = new mapscript::mapObj( "/maps/$xmap.map" ); > >>>> if (! $map) > >>>> { > >>>> #print STDERR "----- Error loading map: $xmap.map\n"; > >>>> print("Content-type: text/text\r\n\r\n"); > >>>> print "cant load $xmap.map"; > >>>> $request->Finish(); > >>>> next; > >>>> } > >>>> > >>>> mapscript::msIO_installStdoutToBuffer(); > >>>> > >>>> $x = $map->OWSDispatch( $req ); > >>>> if ($x) > >>>> { > >>>> print STDERR "OWSDispatch: $x\n"; > >>>> my $errObj = new mapscript::errorObj(); > >>>> while ($errObj) { > >>>> print STDERR "ERROR: > $errObj->{code}:$errObj->{message}:$errObj->{routine} \n"; > >>>> $errObj = $errObj->next(); > >>>> } > >>>> } > >>>> > >>>> my $content_type = mapscript::msIO_stripStdoutBufferContentType(); > >>>> > >>>> $x = mapscript::msIO_getStdoutBufferBytes(); > >>>> > >>>> > >>>> print("Content-type: $content_type\r\n\r\n"); > >>>> if (mapscript::msGetVersionInt() >= 50500) > >>>> { > >>>> print $$x; > >>>> } else { > >>>> print $x; > >>>> } > >>>> > >>>> mapscript::msIO_resetHandlers(); > >>>> $request->Finish(); > >>>> } > >>>> > >>>> > >>>> > >>>> I'd recommend using mapserver 5.6.0. > >>>> > >>>> -Andy > >>>> > >>> > >> > >> Adrian Popa wrote: > >> > Thank you, > >> > > >> > I will look into it. I guess through mapscript I can redefine the > >> > parameters that get sent to mapserver? Or do I rewrite the whole map? > >> > > >> > >> > >> You can load a map into memory (I assume you were already doing that). You > said "..perl.. receives the URL parameters ...and... builds the map file". > >> > >> > >> I assume your perl does: use mapscript? > >> > >> and at some point: my $map = new mapscript::mapObj( "/maps/$xmap.map" ); > >> > >> You kind of imbed mapserver into your perl script, and can call its functions > and what not. After you load the map you can do things to it, in memory. > >> > >> In my example above, I'm using the WMS features ($map->OWSDispatch), but you > can also generate an image: > >> > >> my $img = $map->draw(); > >> $img->save('x.jpg', $mapscript::MS_JPG); > >> > >> -Andy > >> > > > > > > Adrian Popa wrote: > > Thank you Andy for explaining. > > > > Actually my wrapper is very hard-core, meaning I don't use mapscript > > (because I had to build it quickly and didn't have time to research > > which was the best approach). Now I have more time and I'd like to tune > > things up, so I will definitely start studying mapscript (If you have a > > link to a good tutorial/function reference for it I am in your debt). > > > > My wrapper just copied over a template map file, edited it (rewrites > > some filters) and then it set > > $ENV{'QUERY_STRING'} = $ENV{'QUERY_STRING'}."&map=$file"; > > > > ...and then called > > > > print `/var/www/cgi-bin/mapserv`; > > > > > > It's barbaric, I know, but it worked for me. :) > > It will take a bit of rewrite to add fcgi support and mapscript, but in > > the long run it will be more mantainable... :) > > > > Thanks again, > > Adrian > > So are you using the template html stuff? Humm... I've never used that stuff, > not sure how it'll all translate. > > For documentation, I used the mapscript reference: > http://mapserver.org/mapscript/mapscript.html > > I found a few example perl scripts that helped with the syntax (my $c = new > mapscript::colorObj(), $c->{blue} = 255;, etc...). Other than that, I had more > problems comming up with nice looking colors for my map, than actually writing > the perl code. > > -Andy > _______________________________________________ > mapserver-users mailing list > [hidden email] > http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Milo van der Linden-3
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I have:
- mapserver running as fastcgi - php running as fastcgi I am currently setting up, not sure how this is going to end up; but I have the structure you mention in mind too. I hope that since both processes are fcgi they will enhance each other? But testing will have to prove it in the near future. Dan Little schreef: > If you can you might want to consider python... the syntax is a little cleaner with Mapscript. Of course, that's an opinion but I also am a little allergic to sigils (I get all itchy). > > > ----- Original Message ---- > >> From: Andy Colson <[hidden email]> >> To: Adrian Popa <[hidden email]> >> Cc: [hidden email] >> Sent: Wed, November 4, 2009 8:38:52 AM >> Subject: Re: [mapserver-users] Designing a wrapper around mapserv which can be used with fcgi >> >> >>> Andy Colson wrote: >>> >>>>> Andy Colson wrote: >>>>> >>>>>> Adrian Popa wrote: >>>>>> >>>>>>> Hello everyone, >>>>>>> >>>>>>> I am currently using a wrapper around mapserv which receives the URL >>>>>>> >> parameters, builds the map file (actually I only need to set some filters in the >> map file, but the filters need to be built after running some SQL queries with >> the passed in parameters). After the map file is built, mapserv is called (as a >> shell script), and the map gets sent to the user. Currently this wrapper is >> written in perl - so it's not terribly fast as a cgi process. >> >>>>>>> While this approach works, it is terribly inefficient. I would like to use >>>>>>> >> mapserv as a fcgi process (or something faster than plain cgi). My question is - >> how can I /should I build a wrapper around mapserv that can "customize" the MAP >> file on the fly and run as a fcgi process? >> >>>>>>> Any ideas on where I should start? An example of such a wrapper? >>>>>>> >>>>>>> Also, I suspect I can send parameters to mapserver and use some sort of >>>>>>> >> variables in the map file to set up my filters - but I haven't seen an example. >> Can someone point me to such a documentation? >> >>>>>>> Thanks, >>>>>>> Adrian >>>>>>> >>>>>> Have you seen mapscript? You can use mapserver directly from perl. And >>>>>> >> perl can do fast-cgi. Here is a little, ad-hoc, non-tested, perl fcgi: >> >>>>>> #!/usr/bin/perl >>>>>> >>>>>> use strict; >>>>>> use mapscript; >>>>>> use FCGI; >>>>>> >>>>>> >>>>>> my $request = FCGI::Request( ); >>>>>> while($request->Accept() >= 0) >>>>>> { >>>>>> my($req, $x, $at, $xmap, $xpin, $sid, $y, $q); >>>>>> >>>>>> $req = new mapscript::OWSRequest(); >>>>>> $req->loadParams(); >>>>>> >>>>>> $xmap = $req->getValueByName('map'); >>>>>> $xpin = $req->getValueByName('pin'); >>>>>> >>>>>> my $map = new mapscript::mapObj( "/maps/$xmap.map" ); >>>>>> if (! $map) >>>>>> { >>>>>> #print STDERR "----- Error loading map: $xmap.map\n"; >>>>>> print("Content-type: text/text\r\n\r\n"); >>>>>> print "cant load $xmap.map"; >>>>>> $request->Finish(); >>>>>> next; >>>>>> } >>>>>> >>>>>> mapscript::msIO_installStdoutToBuffer(); >>>>>> >>>>>> $x = $map->OWSDispatch( $req ); >>>>>> if ($x) >>>>>> { >>>>>> print STDERR "OWSDispatch: $x\n"; >>>>>> my $errObj = new mapscript::errorObj(); >>>>>> while ($errObj) { >>>>>> print STDERR "ERROR: >>>>>> >> $errObj->{code}:$errObj->{message}:$errObj->{routine} \n"; >> >>>>>> $errObj = $errObj->next(); >>>>>> } >>>>>> } >>>>>> >>>>>> my $content_type = mapscript::msIO_stripStdoutBufferContentType(); >>>>>> >>>>>> $x = mapscript::msIO_getStdoutBufferBytes(); >>>>>> >>>>>> >>>>>> print("Content-type: $content_type\r\n\r\n"); >>>>>> if (mapscript::msGetVersionInt() >= 50500) >>>>>> { >>>>>> print $$x; >>>>>> } else { >>>>>> print $x; >>>>>> } >>>>>> >>>>>> mapscript::msIO_resetHandlers(); >>>>>> $request->Finish(); >>>>>> } >>>>>> >>>>>> >>>>>> >>>>>> I'd recommend using mapserver 5.6.0. >>>>>> >>>>>> -Andy >>>>>> >>>>>> >>>> Adrian Popa wrote: >>>> >>>>> Thank you, >>>>> >>>>> I will look into it. I guess through mapscript I can redefine the >>>>> parameters that get sent to mapserver? Or do I rewrite the whole map? >>>>> >>>>> >>>> You can load a map into memory (I assume you were already doing that). You >>>> >> said "..perl.. receives the URL parameters ...and... builds the map file". >> >>>> I assume your perl does: use mapscript? >>>> >>>> and at some point: my $map = new mapscript::mapObj( "/maps/$xmap.map" ); >>>> >>>> You kind of imbed mapserver into your perl script, and can call its functions >>>> >> and what not. After you load the map you can do things to it, in memory. >> >>>> In my example above, I'm using the WMS features ($map->OWSDispatch), but you >>>> >> can also generate an image: >> >>>> my $img = $map->draw(); >>>> $img->save('x.jpg', $mapscript::MS_JPG); >>>> >>>> -Andy >>>> >>>> >>> >> Adrian Popa wrote: >> >>> Thank you Andy for explaining. >>> >>> Actually my wrapper is very hard-core, meaning I don't use mapscript >>> (because I had to build it quickly and didn't have time to research >>> which was the best approach). Now I have more time and I'd like to tune >>> things up, so I will definitely start studying mapscript (If you have a >>> link to a good tutorial/function reference for it I am in your debt). >>> >>> My wrapper just copied over a template map file, edited it (rewrites >>> some filters) and then it set >>> $ENV{'QUERY_STRING'} = $ENV{'QUERY_STRING'}."&map=$file"; >>> >>> ...and then called >>> >>> print `/var/www/cgi-bin/mapserv`; >>> >>> >>> It's barbaric, I know, but it worked for me. :) >>> It will take a bit of rewrite to add fcgi support and mapscript, but in >>> the long run it will be more mantainable... :) >>> >>> Thanks again, >>> Adrian >>> >> So are you using the template html stuff? Humm... I've never used that stuff, >> not sure how it'll all translate. >> >> For documentation, I used the mapscript reference: >> http://mapserver.org/mapscript/mapscript.html >> >> I found a few example perl scripts that helped with the syntax (my $c = new >> mapscript::colorObj(), $c->{blue} = 255;, etc...). Other than that, I had more >> problems comming up with nice looking colors for my map, than actually writing >> the perl code. >> >> -Andy >> _______________________________________________ >> mapserver-users mailing list >> [hidden email] >> http://lists.osgeo.org/mailman/listinfo/mapserver-users >> > > > > > _______________________________________________ > mapserver-users mailing list > [hidden email] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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Adrian Popa
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by Dan Little
Some javascript/style in this post has been disabled (why?)
Sorry, I'll stick with perl because I already have experience with it
(and I got used to the cryptic syntax). I'm a big fat zero when it
comes to python, so let's not complicate matters unnecessarily :)Andy - thanks for the reference. I too had problems with matching colors (there doesn't seem to be an algorithm that matches them for you!) - but I solved it by stealing color schemes from other maps :) Regards, Adrian Dan Little wrote: If you can you might want to consider python... the syntax is a little cleaner with Mapscript. Of course, that's an opinion but I also am a little allergic to sigils (I get all itchy). ----- Original Message ----From: Andy Colson [hidden email] To: Adrian Popa [hidden email] Cc: [hidden email] Sent: Wed, November 4, 2009 8:38:52 AM Subject: Re: [mapserver-users] Designing a wrapper around mapserv which can be used with fcgi _______________________________________________ mapserver-users mailing list [hidden email] http://lists.osgeo.org/mailman/listinfo/mapserver-users |
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