Re: [mapserver-users] Python MapScript via WSGI examples

Julien-Samuel Lacroix Fri, 15 Jul 2016 12:25:54 -0700

Hi Tom,

I tried your script and simply changed the mapfile to use the one inmapserver/tests/


I got a valid response from the following URL:
http://127.0.0.1:8001/?service=wms&request=GetMap&layers=Testing&version=1.1.1&format=image/png&srs=EPSG:4326&BBOX=-180,-90,180,90&WIDTH=600&HEIGHT=300

What are you using?

Julien


On 16-07-15 02:05 PM, Kralidis, Tom (EC) wrote:

Thanks Julien and Stephan: I've updated my example in [1], however I get
the following traceback when issuing a WMS 1.1.1 GetMap request:

Traceback (most recent call last):
   File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
     self.result = application(self.environ, self.start_response)
   File "mapscript-wsgi.py", line 40, in application
     start_response('200 OK', [('Content-type', content_type)])
   File "/usr/lib/python2.7/wsgiref/handlers.py", line 180, in start_response
     assert type(val) is StringType,"Header values must be strings"
AssertionError: Header values must be string

Any idea?

..Tom

[1] https://gist.github.com/tomkralidis/9adbd4864c03647aa7eb4f96a3c33297

-----Original Message-----
From: mapserver-users [mailto:mapserver-users-boun...@lists.osgeo.org]
On Behalf Of Stephan Meißl
Sent: 14 July 2016 11:57
To: mapserver-users@lists.osgeo.org
Subject: Re: [mapserver-users] Python MapScript via WSGI examples

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi Tom,

adding to Julien's response you could also replace
`request.loadParams()` with
`request.loadParamsFromURL(env['QUERY_STRING'])`.

As Julien said, key is that the environment variables are not set
automatically.

cu
Stephan

On 07/14/2016 05:19 PM, Julien-Samuel Lacroix wrote:

Hi Tom,

When I run your script, I get the following response:

   This script can only be used to decode form results and
   should be initiated as a CGI process via a httpd server.

This answer does not contain any content-type that can be stripped wit

msIO_getStdoutBufferBytes(). That's why it returns None.

Before your OWSRequest call, you need to set the Environment variable
that MapServer needs. Otherwise they are passed in the env variable an

not to MapServer. Code to add:


# List of all environment variable used by MapServer
mapserv_env = [
  'CONTENT_LENGTH', 'CONTENT_TYPE', 'CURL_CA_BUNDLE',

'HTTP_COOKIE',

  'HTTP_HOST', 'HTTPS', 'HTTP_X_FORWARDED_HOST',

'HTTP_X_FORWARDED_PORT
',

  'HTTP_X_FORWARDED_PROTO', 'MS_DEBUGLEVEL',

'MS_ENCRYPTION_KEY',

  'MS_ERRORFILE', 'MS_MAPFILE', 'MS_MAPFILE_PATTERN',

'MS_MAP_NO_PATH',

  'MS_MAP_PATTERN', 'MS_MODE', 'MS_OPENLAYERS_JS_URL',

'MS_TEMPPATH',

  'MS_XMLMAPFILE_XSLT', 'PROJ_LIB', 'QUERY_STRING', 'REMOTE_ADDR',
  'REQUEST_METHOD', 'SCRIPT_NAME', 'SERVER_NAME', 'SERVER_PORT'
]
for key in mapserv_env:
     if key in env:
         os.environ[key] = env[key]
     else:
         os.unsetenv(key)
request = mapscript.OWSRequest()


Best regards,
Julien

On 16-07-13 12:55 PM, Kralidis, Tom (EC) wrote:

Hi all: we are looking into updating our Python MapScript (CGI-based)
wrappers
to leverage WSGI, and are having integration issues as part of testin

g.


We are using 6.4.2 on Ubuntu 14.04.  See example in [1] (against
any mapfile is fine).  Simple run with python ./mapscript-wsgi.py
which makes
the server available on localhost:8000 by default.

Issues:

- the value in

https://gist.github.com/tomkralidis/9adbd4864c03647aa7eb4f96a3c33297#
file-mapscript-wsgi-py-L18

ends up being a Python None type for some reason when it should be a
string of the content-type
- issuing a, say, WMS 1.3.0 GetCapabilities request yields the
venerable MapServer "This script can ...." default message, when I am
expecting Capabilities XML

Any ideas what I'm doing wrong here?

..Tom

[1] https://gist.github.com/tomkralidis/9adbd4864c03647aa7eb4f96a3c33

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--
Julien-Samuel Lacroix
T: +1 418-696-5056 #202
Mapgears
http://www.mapgears.com/
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Re: [mapserver-users] Python MapScript via WSGI examples

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