can't have a MultiProvider with mvt tiles

I’m on an old Tilestache branch created by the now-defunct Mapzen, and things work fine. It used to be that their branch was the only one that created vector tiles.

When I try to upgrade to the current Tilestache, I can’t produce my vector tiles, because MultiProvider doesn’t work. I combine tiles to include multiple layers in my tiles.

There are many other functions named getTypeByExtension that do handle mvt as an extension, but for some reason, the one in MultiProvider does not.

If I try to just edit that function to return what I expect it would do, I get an error later on: AttributeError: MultiProviderWithTileserverParameters instance has no attribute 'ignore_cached_sublayers'

This is the error trace (from the unedited code):

  File "/opt/emp_eng/empower_engine/tilestache/TileServer.py", line 73, in __call__
    response = self.tile_server.__call__(environ, start_response)
  File "/home/ee/.virtualenvs/tiles/local/lib/python2.7/site-packages/TileStache/__init__.py", line 393, in __call__
    status_code, headers, content = requestHandler2(self.config, path_info, query_string, script_name)
  File "/home/ee/.virtualenvs/tiles/local/lib/python2.7/site-packages/TileStache/__init__.py", line 266, in requestHandler2
    status_code, headers, content = layer.getTileResponse(coord, extension)
  File "/home/ee/.virtualenvs/tiles/local/lib/python2.7/site-packages/TileStache/Core.py", line 375, in getTileResponse
    mimetype, format = self.getTypeByExtension(extension)
  File "/home/ee/.virtualenvs/tiles/local/lib/python2.7/site-packages/TileStache/Core.py", line 634, in getTypeByExtension
    return self.provider.getTypeByExtension(extension)
  File "/home/ee/.virtualenvs/tiles/local/lib/python2.7/site-packages/TileStache/Goodies/VecTiles/server.py", line 261, in getTypeByExtension
    raise ValueError(extension)
ValueError: mvt

[JulieGoldberg]

@migurski Thanks in advance. I totally see why you’d use their code as a reference, not just merge it in. I look forward to hearing more later in the week.

FWIW, I am the one that opened the issue. I just accidentally did so on our generic company account instead of my own and don’t see how to swap it over.

[migurski]

I’m happy that worked, Julie! I see your email, thank you for sending it. I will attempt to integrate your changes.