Trace (Utility Network) error in custom GP Enterprise

[CeciliaAtos]

I'm customizing a geoprocessing tool that runs an arcpy.un.Trace.

I can successfully run the GP tool in ArcGIS Pro, but when I publish it to ArcGIS Enterprise, I receive the following message:

"Parameters are not valid. ERROR 000840: The value is not a String. Failed to execute (Trace)."

g_ESRI_variable_4 = 'https://myportal/server/rest/services/Water/Water/FeatureServer/8'        

arcpy.un.Trace(
        in_utility_network=g_ESRI_variable_4,
        trace_type="ISOLATION",
        starting_points=temp_starting,
        domain_network="Water",
        tier="Distribuição",
        out_json_file=trace_json
    )

Does someone once made an GP tool that runs a Trace and worked?

[robertopepato_bizpoke]

I'm not confident that using a service URL directly in the in_utility_network works for this call. Have you tried to use the arcpy.management.MakeFeatureLayer to create a temporary layer object from the URL, and then pass it to the in_utility_network parameter?

[CeciliaAtos]

I cannot create a temporary layer using a specific sublayer such as “FeatureServer/8” (my network layer).

Temporary layers created from individual sublayers cannot be used as in_utility_network, since they are not recognized as a Utility Network.

[robertopepato_bizpoke]

Makes sense. Two more questions (I'm trying to reproduce your scenario on my environment):

1 - Assuming your UN service is secured, are you setting the active portal and signing in before executing the Trace?
2 - What's the content of the temp_starting variable?

[CeciliaAtos]

Thank you very much, Roberto.

1 - Assuming your UN service is secured, are you setting the active portal and signing in before executing the Trace?

A: That’s a good question. I'm currently not signing in because all the services are in registered datastores, so I thought I didn’t need to log in within my GP tool. However, I will set the login and test it again.

2 - What's the content of the temp_starting variable?

A: I’ll paste below the relevant part of my code.

#start by creating my startingpoint in scratch
temp_starting = arcpy.management.CreateFeatureclass(
            out_path=scratch_gdb,
            out_name="UN_TEMP_STARTING_POINT",
            geometry_type="POINT",
            spatial_reference=arcpy.SpatialReference(31983), 
            has_z="DISABLED",
            has_m="DISABLED"
            ).getOutput(0) 

        fields = [
            ("LAYERNAME", "TEXT", 255, None, None, None),
            ("FEATUREGLOBALID", "GUID", None, None, None, None),
            ("TERMINALID", "LONG", None, 10, 0, None),
            ("PERCENTALONG", "DOUBLE", None, 38, 8, None),
        ]


        for name, ftype, length, precision, scale, domain in fields:
            arcpy.management.AddField(
                in_table=temp_starting,
                field_name=name,
                field_type=ftype,
                field_precision=precision if precision else None,
                field_scale=scale if scale else None,
                field_length=length if length else None,
                field_alias=name,
                field_is_nullable="NULLABLE",
                field_is_required="NON_REQUIRED",
                field_domain=domain if domain else ""
            )


        # search global id parameter (the user must input)


        where_clause = f"GLOBALID = '{globalid}'"
        layer_name = "pipe_selection"

        arcpy.env.preserveGlobalIds = True
        filtro_inicial = arcpy.management.MakeFeatureLayer(pipe_input, layer_name, where_clause)
        arcpy.AddMessage(f"Feições copiadas para: {filtro_inicial}")

        
        with arcpy.da.SearchCursor(filtro_inicial, ["GLOBALID", "SHAPE@"]) as s_cursor, \
            arcpy.da.InsertCursor(temp_starting,
                                ["SHAPE@", "LAYERNAME", "FEATUREGLOBALID", "TERMINALID", "PERCENTALONG"]) as i_cursor:

            for globalid, shape in s_cursor:
                centroid = shape.positionAlongLine(0.5, use_percentage=True)
                percent_along = 0.5
                i_cursor.insertRow((centroid, "Tubulação", globalid, "-1", percent_along))

        arcpy.AddMessage(f"Trace location criada: {temp_starting}")

So, when the user enters the pipe’s GlobalID, this part of the code automatically calculates all the starting_point parameters. Then I use this temp_starting feature class as the starting_point input in the Trace tool.

I’m no longer receiving any errors related to this parameter (I was struggling with that before, haha).