Bug report #13088
qgis-server mixing layer db-connections
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | QGIS Server | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | Linux / Ubuntu / Debian | Easy fix?: | No |
| Pull Request or Patch supplied: | No | Resolution: | |
| Crashes QGIS or corrupts data: | Yes | Copied to github as #: | 21155 |
Description
Environment:
2 PostGIS databases
2 project files, one for each database
When using the qgis-web-client and qgis-server to display the projects, the qgis-server mixes the database-connections and displays data from the other project. This happens randomly, but is reproducible after a few tries.
It only happens when the 2 projects are accessed simultaneously (e.g. using 2 browsers, and switching between them).
I compiled qgis-server from source (2015-06-08), and added some debug statements. Somehow after the QgsPostgresProvider for the layer is created (Line: "p3: Table name is.."), some calls to featureSource return the right datasource-uri, and some use another.
That's how far I got.
This happens on my Ubuntu 14.04 /64bit and Debian Jessie 64bit, using Apache2
I would be happy to supply some more information.
example-debug-messages.txt 
(3.55 KB)
disable_layer_caching.patch
(581 Bytes)
History
#1
Updated by Tom Palan over 9 years ago
- File disable_layer_caching.patch added
Update: The problem only occures if the 2 projects have layers with the same name. Apparently somewhere in QgsWMSProjectParser::mapLayerFromStyle (when called with useCache=true) mixes layers from different projects.
I was able to "fix" it by disabling caching of layers, see patch. As this is only a temporary fix, could somebody with more knowledge of QGIS chime in?
#2
Updated by Marco Hugentobler over 9 years ago
- Status changed from Open to Closed
It happened if two layers have the same id and the same layer name. But it should be fixed in master branch already (127dd64)