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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.
// ==========================================================================
using System;
using System.IO;
using System.Collections;
using System.Collections.Specialized;
using System.Reflection;
using System.Reflection.Emit;
namespace Python.Runtime {
/// <summary>
/// The AssemblyManager maintains information about the assemblies and
/// namespaces that have been loaded, and provides a simplified internal
/// interface for finding and obtaining Type objects by qualified names.
/// </summary>
internal class AssemblyManager {
static StringCollection pypath;
static AssemblyLoadEventHandler lh;
static ResolveEventHandler rh;
static Hashtable namespaces;
static ArrayList assemblies;
static Hashtable probed;
private AssemblyManager() {}
//===================================================================
// Initialization performed on startup of the Python runtime.
//===================================================================
internal static void Initialize() {
pypath = new StringCollection();
namespaces = new Hashtable();
assemblies = new ArrayList();
probed = new Hashtable();
AppDomain domain = AppDomain.CurrentDomain;
lh = new AssemblyLoadEventHandler(AssemblyLoadHandler);
domain.AssemblyLoad += lh;
rh = new ResolveEventHandler(ResolveHandler);
domain.AssemblyResolve += rh;
Assembly[] items = domain.GetAssemblies();
for (int i = 0; i < items.Length; i++) {
Assembly a = items[i];
assemblies.Add(a);
ScanAssembly(a);
}
}
//===================================================================
// Cleanup resources upon shutdown of the Python runtime.
//===================================================================
internal static void Shutdown() {
AppDomain domain = AppDomain.CurrentDomain;
domain.AssemblyLoad -= lh;
domain.AssemblyResolve -= rh;
}
//===================================================================
// Event handler for assembly load events. At the time the Python
// runtime loads, we scan the app domain to map the assemblies that
// are loaded at the time. We also have to register this event handler
// so that we can know about assemblies that get loaded after the
// Python runtime is initialized.
//===================================================================
static void AssemblyLoadHandler(Object ob, AssemblyLoadEventArgs args){
Assembly assembly = args.LoadedAssembly;
assemblies.Add(assembly);
ScanAssembly(assembly);
}
//===================================================================
// Event handler for assembly resolve events. This is needed because
// we augment the assembly search path with the PYTHONPATH when we
// load an assembly from Python. Because of that, we need to listen
// for failed loads, because they might be dependencies of something
// we loaded from Python which also needs to be found on PYTHONPATH.
//===================================================================
static Assembly ResolveHandler(Object ob, ResolveEventArgs args){
string name = args.Name.ToLower();
for (int i = 0; i < assemblies.Count; i++) {
Assembly a = (Assembly)assemblies[i];
string full = a.FullName.ToLower();
if (full.StartsWith(name)) {
return a;
}
}
Assembly ao = LoadAssemblyPath(args.Name);
return ao;
}
//===================================================================
// We __really__ want to avoid using Python objects or APIs when
// probing for assemblies to load, since our ResolveHandler may be
// called in contexts where we don't have the Python GIL and can't
// even safely try to get it without risking a deadlock ;(
//
// To work around that, we update a managed copy of sys.path (which
// is the main thing we care about) when UpdatePath is called. The
// import hook calls this whenever it knows its about to use the
// assembly manager, which lets us keep up with changes to sys.path
// in a relatively lightweight and low-overhead way.
//===================================================================
internal static void UpdatePath() {
IntPtr list = Runtime.PySys_GetObject("path");
int count = Runtime.PyList_Size(list);
if (count != pypath.Count) {
pypath.Clear();
probed.Clear();
for (int i = 0; i < count; i++) {
IntPtr item = Runtime.PyList_GetItem(list, i);
string path = Runtime.GetManagedString(item);
if (path != null) {
pypath.Add(path);
}
}
}
}
//===================================================================
// Given an assembly name, try to find this assembly file using the
// PYTHONPATH. If not found, return null to indicate implicit load
// using standard load semantics (app base directory then GAC, etc.)
//===================================================================
static string FindAssembly(string name) {
char sep = Path.DirectorySeparatorChar;
string path;
string temp;
for (int i = 0; i < pypath.Count; i++) {
string head = pypath[i];
if (head == null || head.Length == 0) {
path = name;
}
else {
path = head + sep + name;
}
temp = path + ".dll";
if (File.Exists(temp)) {
return temp;
}
temp = path + ".exe";
if (File.Exists(temp)) {
return temp;
}
}
return null;
}
//===================================================================
// Loads an assembly from the application directory or the GAC
// given a simple assembly name. Returns the assembly if loaded.
//===================================================================
public static Assembly LoadAssembly(string name) {
Assembly assembly = null;
try {
assembly = Assembly.LoadWithPartialName(name);
}
catch {
}
return assembly;
}
//===================================================================
// Loads an assembly using an augmented search path (the python path).
//===================================================================
public static Assembly LoadAssemblyPath(string name) {
string path = FindAssembly(name);
Assembly assembly = null;
if (path != null) {
try { assembly = Assembly.LoadFrom(path); }
catch {}
}
return assembly;
}
//===================================================================
// Given a qualified name of the form A.B.C.D, attempt to load
// an assembly named after each of A.B.C.D, A.B.C, A.B, A. This
// will only actually probe for the assembly once for each unique
// namespace. Returns true if any assemblies were loaded.
//===================================================================
public static bool LoadImplicit(string name) {
string[] names = name.Split('.');
bool loaded = false;
string s = "";
for (int i = 0; i < names.Length; i++) {
s = (i == 0) ? names[0] : s + "." + names[i];
if (probed[s] == null) {
if (LoadAssemblyPath(s) != null){
loaded = true;
}
else if (LoadAssembly(s) != null) {
loaded = true;
}
probed[s] = 1;
}
}
return loaded;
}
//===================================================================
// Scans an assembly for exported namespaces, adding them to the
// mapping of valid namespaces. Note that for a given namespace
// a.b.c.d, each of a, a.b, a.b.c and a.b.c.d are considered to
// be valid namespaces (to better match Python import semantics).
//===================================================================
static void ScanAssembly(Assembly assembly) {
// A couple of things we want to do here: first, we want to
// gather a list of all of the namespaces contributed to by
// the assembly. Since we have to rifle through all of the
// types in the assembly anyway, we also build up a running
// list of 'odd names' like generic names so that we can map
// them appropriately later while still being lazy about
// type lookup and instantiation.
Type[] types = assembly.GetTypes();
for (int i = 0; i < types.Length; i++) {
Type t = types[i];
string ns = t.Namespace != null ? t.Namespace : "";
if ((ns != null) && (!namespaces.ContainsKey(ns))) {
string[] names = ns.Split('.');
string s = "";
for (int n = 0; n < names.Length; n++) {
s = (n == 0) ? names[0] : s + "." + names[n];
if (!namespaces.ContainsKey(s)) {
namespaces.Add(s, new Hashtable());
}
}
}
Hashtable asm = namespaces[ns] as Hashtable;
if (ns != null && !asm.ContainsKey(assembly)) {
asm.Add(assembly, String.Empty);
}
}
}
//===================================================================
// Returns true if the given qualified name matches a namespace
// exported by an assembly loaded in the current app domain.
//===================================================================
public static bool IsValidNamespace(string name) {
return namespaces.ContainsKey(name);
}
//===================================================================
// Returns the current list of valid names for the input namespace.
//===================================================================
public static StringCollection GetNames(string nsname) {
StringCollection names = new StringCollection();
if (namespaces.ContainsKey(nsname)) {
Hashtable asm = namespaces[nsname] as Hashtable;
foreach (Object o in asm.Keys) {
Assembly a = o as Assembly;
Type[] types = a.GetTypes();
for (int i = 0; i < types.Length; i++) {
Type t = types[i];
if (t.Namespace == nsname) {
names.Add(t.Name);
}
}
}
int nslen = nsname.Length;
foreach (object n in namespaces.Keys) {
string key = n as string;
if (key.Length > nslen && key.StartsWith(nsname)) {
string tail = key.Substring(nslen);
if (key.IndexOf('.') == -1) {
names.Add(key);
}
}
}
}
return names;
}
//===================================================================
// Returns the System.Type object for a given qualified name,
// looking in the currently loaded assemblies for the named
// type. Returns null if the named type cannot be found.
//===================================================================
public static Type LookupType(string qualifiedName) {
for (int i = 0; i < assemblies.Count; i++) {
Assembly assembly = (Assembly)assemblies[i];
Type type = assembly.GetType(qualifiedName);
if (type != null) {
return type;
}
}
return null;
}
}
}