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ClrModule.cs
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// ==========================================================================
// This software is subject to the provisions of the Zope Public License,
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
// FOR A PARTICULAR PURPOSE.
// ==========================================================================
//============================================================================
// This file replaces the hand-maintained stub that used to implement clr.dll.
// This is a line-by-line port from IL back to C#.
// We now use RGiesecke.DllExport on the required static init method so it can be
// loaded by a standard CPython interpreter as an extension module. When it
// is loaded, it bootstraps the managed runtime integration layer and defers
// to it to do initialization and put the clr module into sys.modules, etc.
// The "USE_PYTHON_RUNTIME_*" defines control what extra evidence is used
// to help the CLR find the appropriate Python.Runtime assembly.
// If defined, the "pythonRuntimeVersionString" variable must be set to
// Python.Runtime's current version.
#define USE_PYTHON_RUNTIME_VERSION
// If defined, the "PythonRuntimePublicKeyTokenData" data array must be
// set to Python.Runtime's public key token. (sn -T Python.Runtin.dll)
#define USE_PYTHON_RUNTIME_PUBLIC_KEY_TOKEN
// If DEBUG_PRINT is defined in the Build Properties, a few System.Console.WriteLine
// calls are made to indicate what's going on during the load...
//============================================================================
// ReSharper disable CheckNamespace
// ReSharper disable InconsistentNaming
public class clrModule
// ReSharper restore InconsistentNaming
// ReSharper restore CheckNamespace
{
[RGiesecke.DllExport.DllExport("initclr", System.Runtime.InteropServices.CallingConvention.StdCall)]
// ReSharper disable InconsistentNaming
public static void initclr()
// ReSharper restore InconsistentNaming
{
#if DEBUG_PRINT
System.Console.WriteLine("Attempting to load Python.Runtime using standard binding rules... ");
#endif
#if USE_PYTHON_RUNTIME_PUBLIC_KEY_TOKEN
var pythonRuntimePublicKeyTokenData = new byte[] { 0x50, 0x00, 0xfe, 0xa6, 0xcb, 0xa7, 0x02, 0xdd };
#endif
// Attempt to find and load Python.Runtime using standard assembly binding rules.
// This roughly translates into looking in order:
// - GAC
// - ApplicationBase
// - A PrivateBinPath under ApplicationBase
// With an unsigned assembly, the GAC is skipped.
var pythonRuntimeName = new System.Reflection.AssemblyName("Python.Runtime")
{
#if USE_PYTHON_RUNTIME_VERSION
Version = new System.Version("4.0.0.1"),
#endif
CultureInfo = System.Globalization.CultureInfo.InvariantCulture,
};
#if USE_PYTHON_RUNTIME_PUBLIC_KEY_TOKEN
pythonRuntimeName.SetPublicKeyToken(pythonRuntimePublicKeyTokenData);
#endif
// We've got the AssemblyName with optional features; try to load it.
System.Reflection.Assembly pythonRuntime;
try
{
pythonRuntime = System.Reflection.Assembly.Load(pythonRuntimeName);
#if DEBUG_PRINT
System.Console.WriteLine("Success!");
#endif
}
catch (System.IO.FileNotFoundException)
{
try
{
// If the above fails for any reason, we fallback to attempting to load "Python.Runtime.dll"
// from the directory this assembly is running in. "This assembly" is probably "clr.pyd",
// sitting somewhere in PYTHONPATH. This is using Assembly.LoadFrom, and inherits all the
// caveats of that call. See MSDN docs for details.
// Suzanne Cook's blog is also an excellent source of info on this:
// http://blogs.msdn.com/suzcook/
// http://blogs.msdn.com/suzcook/archive/2003/05/29/57143.aspx
// http://blogs.msdn.com/suzcook/archive/2003/06/13/57180.aspx
var executingAssembly = System.Reflection.Assembly.GetExecutingAssembly();
var assemblyDirectory = System.IO.Path.GetDirectoryName(executingAssembly.Location);
if (assemblyDirectory == null)
throw new System.InvalidOperationException(executingAssembly.Location);
var pythonRuntimeDllPath = System.IO.Path.Combine(assemblyDirectory, "Python.Runtime.dll");
#if DEBUG_PRINT
System.Console.WriteLine("Attempting to load Python.Runtime from: '{0}'...", pythonRuntimeDllPath);
#endif
pythonRuntime = System.Reflection.Assembly.LoadFrom(pythonRuntimeDllPath);
}
catch (System.InvalidOperationException) {
#if DEBUG_PRINT
System.Console.WriteLine("Could not load Python.Runtime, so sad.");
#endif
return;
}
}
// Once here, we've successfully loaded SOME version of Python.Runtime
// So now we get the PythonEngine and execute the InitExt method on it.
var pythonEngineType = pythonRuntime.GetType("Python.Runtime.PythonEngine");
pythonEngineType.InvokeMember("InitExt", System.Reflection.BindingFlags.InvokeMethod, null, null, null);
}
}