I’m writing some backend scripts in python that have to be coupled with a web interface that uses django.

The web application allows to view layers that comes from different web services. As part of my tasks I developed a tool that request elevation data from a geoserver (a WCS service) and then, based on the a previous line drew by a user in the front end, is able to generate a cross section of the underlying data.

So, in short: when a user draws a line over a layer and then clicks draw-profile, my function request the data, intersects the line when the associated raster/layer and returns a figure to the front-end.

The problem with that approach is that each time the user clicks draw-profile, the request is made again, which takes some time.

When the request is made, the data is stored in a DTM object (class that I made) in a self.raster property.

A simplified version of the function that requests the data is shown below.

def get_dtm_from_wcs100(
    self,
    raster_source: str = "YY",
    layer: str = "XX",
    format: str = "image/tiff",
    version: str = "1.0.0",
    resx: int = 1,
    resy: int = 1,
) -> None:
    """
    Get raster and metadata from a WCS service

    Parameters
    ----------
    raster_source : str, optional
        URL of WCS service. The default is "YY" which is the company geoserver
    layer : str, optional
        CoverageID. The default is 'XX'.
    format : str, optional
        File type of the request. The default is 'image/tiff'.
    version : str, optional
        Version of the WCS protocol. The default is "1.0.0".
    resx : int, optional
        Pixel resolution in x-coordinate. The default is 1.
    resy : int, optional
        Pixel resolution in y-coordinate. The default is 1.

    Returns
    -------
    None.

    """

    try:
        # Connect to WCS and try getting a coverage
        wcs = WebCoverageService(raster_source, version=version)
        response = wcs.getCoverage(
            identifier=layer,
            bbox=self.bbox,
            crs=self.epsg,
            format=format,
            resx=resx,
            resy=resy,
        )

    except Exception as e:
        raise Exception("An unexpected error has ocurred:", e)

    else:
        self._read_response(response)
        self._set_masked_raster()

When self._read_response(response) runs the self.raster (numpy array) property is filled.

Do you know what could I do in order to store somehow this response and not have to call it each time I want to draw a profile?