Custom IronPython import resolution

Question

I am loading an IronPython script from a database and executing it. This works fine for simple scripts, but imports are a problem. How can I intercept these import calls a

Answer 1

After a great deal of trial and error, I arrived at a solution. I never managed to get the PlatformAdaptationLayer approach to work correctly. It never called back to the PAL when attempting to load the modules.

So what I decided to do was replace the built-in import function by using the SetVariable method as shown below (Engine and Scope are protected members exposing the ScriptEngine and ScriptScope for the parent script):

delegate object ImportDelegate(CodeContext context, string moduleName, PythonDictionary globals, PythonDictionary locals, PythonTuple tuple);

protected void OverrideImport()
{
    ScriptScope scope = IronPython.Hosting.Python.GetBuiltinModule(Engine);
    scope.SetVariable("__import__", new ImportDelegate(DoDatabaseImport));
}

protected object DoDatabaseImport(CodeContext context, string moduleName, PythonDictionary globals, PythonDictionary locals, PythonTuple tuple)
{
    if (ScriptExistsInDb(moduleName))
    {
        string rawScript = GetScriptFromDb(moduleName);
        ScriptSource source = Engine.CreateScriptSourceFromString(rawScript);
        ScriptScope scope = Engine.CreateScope();
        Engine.Execute(rawScript, scope);
        Microsoft.Scripting.Runtime.Scope ret = Microsoft.Scripting.Hosting.Providers.HostingHelpers.GetScope(scope);
        Scope.SetVariable(moduleName, ret);
        return ret;
     }
     else
     {   // fall back on the built-in method
         return IronPython.Modules.Builtin.__import__(context, moduleName);
     }
}

Hope this helps someone!