How to initialize specific pages for each user in a multi-user environment?

[ShiroDoMain]

I've implemented multi-user remote rendering support using Docker, but there's an issue I haven't resolved yet. I want to individually render specific images for each user who opens a page.

I found a way to get the query string from the URL in discussion #83, but trame.ClientStateChange needs to be defined within the context of SinglePageWithDrawerLayout. However, my image viewer was defined and initialized beforehand. Is there a method that allows me to obtain the desired image name before initializing the image?
My code structure is similar to this:

import SimpleITK as sitk
from trame.widgets import trame
import pyvista
...

@ctrl.set("get_search")
def get_search(search):
    # Here, the file name was obtained
    file = search[1:].split("&")[0].split("=")[1]
    print("search", search)

# initialize belike
image = sitk.ReadImage("data/xxx.nii.gz")  # I hope to load files here
imageViewer1 = vtkImageViewer2()
volume = pv.ImageData()
colorMap = vtkImageMapToColors()
pColorTable = vtkLookupTable()
imageBlend = vtkImageBlend()

volume.origin = image.GetOrigin()
volume.spacing = image.GetSpacing()
volume.dimensions = sobel_np.shape
volume.point_data["values"] = sobel_np.flatten(order="F")
pColorTable.SetTableRange(0, 23)
pColorTable.SetNumberOfTableValues(24)
pColorTable.SetTableValue(0, 0.0, 0.0, 0.0, 0.0)

colorMap.SetInputData(volume)
colorMap.SetLookupTable(pColorTable)
colorMap.Update()
imageBlend.AddInputData(colorMap.GetOutput())
imageViewer.SetInputData(imageBlend.GetOutput())
...


# layout block
with SinglePageWithDrawerLayout(server) as layout:
    trame.ClientStateChange(value="window.location.search", trigger_on_create=True, change=(
        ctrl.get_search, "[window.location.search]")
    with layout.content:
        ........
        view = vtk_widgets.VtkRemoteView(imageViewer.GetRenderWindow(),box_selection=("vtk_selection",)**VTK_VIEW_SETTINGS)

if __name__ == "__main__":
    server.start()

environment:

trame: 3.5.2
SimpleITK: 2.3.1
pyvista: 0.43.3
vtk: 9.3.0

[jourdain]

Actually if you are using our docker to handle the multi-user setup, you just need to make your app take a command line argument and template it from the URL in the apps.yml

[ShiroDoMain]

THX! I added the parameters to launcher.json and app.yml, and then I got the parameters passed via the URL!