terom@138: from werkzeug import Request, Response, exceptions
terom@138: 
terom@138: import pypngtile
terom@166: import pngtile.store
terom@152: 
terom@166: class PNGTileApplication (pngtile.store.PNGTileStore):
terom@166:     """
terom@166:         Web application with a PNGTileStore.
terom@166:     """
terom@166:     
terom@166:     def list (self, url):
terom@166:         """
terom@166:             Yield names by request.url.
terom@138: 
terom@166:             Raises HTTPException
terom@138:         """
terom@138: 
terom@166:         try:
terom@166:             return super(PNGTileApplication, self).list(url)
terom@166:         except pngtile.store.NotFound as error:
terom@166:             raise exceptions.NotFound(str(error))
terom@166:         except pngtile.store.InvalidImage as error:
terom@166:             raise exceptions.BadRequest(str(error))
terom@166:    
terom@166:     def lookup (self, url):
terom@166:         """
terom@166:             Lookup neme, path, type by request.url.
terom@138: 
terom@166:             Raises HTTPException
terom@138:         """
terom@138: 
terom@166:         try:
terom@166:             return super(PNGTileApplication, self).lookup(url)
terom@166:         except pngtile.store.Error as error:
terom@166:             raise exceptions.InternalServerError(str(error))
terom@166:         except pngtile.store.NotFound as error:
terom@166:             raise exceptions.NotFound(str(error))
terom@166:         except pngtile.store.InvalidImage  as error:
terom@166:             raise exceptions.BadRequest(str(error))
terom@138: 
terom@166:     def open (self, url):
terom@166:         """
terom@166:             Return Image, name by request.url
terom@138: 
terom@166:             Raises HTTPException.
terom@166:         """
terom@138: 
terom@166:         try:
terom@166:             return super(PNGTileApplication, self).open(url)
terom@138: 
terom@166:         except pypngtile.Error as error:
terom@166:             raise exceptions.InternalServerError(str(error))
terom@166: 
terom@166:         except pngtile.store.Error as error:
terom@166:             raise exceptions.InternalServerError(str(error))
terom@166: 
terom@166:         except pngtile.store.NotFound as error:
terom@166:             raise exceptions.NotFound(str(error))
terom@166: 
terom@166:         except pngtile.store.InvalidImage  as error:
terom@166:             raise exceptions.BadRequest(str(error))
terom@166: 
terom@166:         except pngtile.store.UncachedImage as error:
terom@166:             raise exceptions.InternalServerError("Requested image has not yet been cached: {image}".format(image=error))
terom@138: 
terom@138:     def handle (self, request):
terom@138:         """
terom@138:             Handle request for an image
terom@138:         """
terom@138: 
terom@138:         raise NotImplementedError()
terom@138: 
terom@138:     @Request.application
terom@138:     def __call__ (self, request):
terom@138:         """
terom@138:             WSGI entry point.
terom@138:         """
terom@138: 
terom@138:         try:
terom@138:             return self.handle(request)
terom@138: 
terom@138:         except exceptions.HTTPException as error:
terom@138:             return error
terom@138: