1 files changed, 231 insertions, 0 deletions
diff --git a/xbmc/interfaces/python/LanguageHook.cpp b/xbmc/interfaces/python/LanguageHook.cpp
new file mode 100644
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--- /dev/null
+++ b/xbmc/interfaces/python/LanguageHook.cpp
@@ -0,0 +1,231 @@
+/*
+ *  Copyright (C) 2005-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+
+#include "LanguageHook.h"
+
+#include "CallbackHandler.h"
+#include "PyContext.h"
+#include "ServiceBroker.h"
+#include "XBPython.h"
+#include "interfaces/legacy/AddonUtils.h"
+#include "utils/log.h"
+
+#include <mutex>
+
+namespace XBMCAddon
+{
+  namespace Python
+  {
+    static AddonClass::Ref<PythonLanguageHook> instance;
+
+    static CCriticalSection hooksMutex;
+    static std::map<PyInterpreterState*,AddonClass::Ref<PythonLanguageHook> > hooks;
+
+    // vtab instantiation
+    PythonLanguageHook::~PythonLanguageHook()
+    {
+      XBMC_TRACE;
+      XBMCAddon::LanguageHook::deallocating();
+    }
+
+    void PythonLanguageHook::MakePendingCalls()
+    {
+      XBMC_TRACE;
+      PythonCallbackHandler::makePendingCalls();
+    }
+
+    void PythonLanguageHook::DelayedCallOpen()
+    {
+      XBMC_TRACE;
+      PyGILLock::releaseGil();
+    }
+
+    void PythonLanguageHook::DelayedCallClose()
+    {
+      XBMC_TRACE;
+      PyGILLock::acquireGil();
+    }
+
+    void PythonLanguageHook::RegisterMe()
+    {
+      XBMC_TRACE;
+      std::unique_lock<CCriticalSection> lock(hooksMutex);
+      hooks[m_interp] = AddonClass::Ref<PythonLanguageHook>(this);
+    }
+
+    void PythonLanguageHook::UnregisterMe()
+    {
+      XBMC_TRACE;
+      std::unique_lock<CCriticalSection> lock(hooksMutex);
+      hooks.erase(m_interp);
+    }
+
+    static AddonClass::Ref<XBMCAddon::Python::PythonLanguageHook> g_languageHook;
+
+    // Ok ... we're going to get it even if it doesn't exist. If it doesn't exist then
+    // we're going to assume we're not in control of the interpreter. This (apparently)
+    // can be the case. E.g. Libspotify manages to call into a script using a ctypes
+    // extension but under the control of an Interpreter we know nothing about. In
+    // cases like this we're going to use a global interpreter
+    AddonClass::Ref<PythonLanguageHook> PythonLanguageHook::GetIfExists(PyInterpreterState* interp)
+    {
+      XBMC_TRACE;
+      std::unique_lock<CCriticalSection> lock(hooksMutex);
+      std::map<PyInterpreterState*,AddonClass::Ref<PythonLanguageHook> >::iterator iter = hooks.find(interp);
+      if (iter != hooks.end())
+        return iter->second;
+
+      // if we got here then we need to use the global one.
+      if (g_languageHook.isNull())
+        g_languageHook = new XBMCAddon::Python::PythonLanguageHook();
+
+      return g_languageHook;
+    }
+
+    bool PythonLanguageHook::IsAddonClassInstanceRegistered(AddonClass* obj)
+    {
+      for (const auto& iter : hooks)
+      {
+        if (iter.second->HasRegisteredAddonClassInstance(obj))
+          return true;
+      }
+      return false;
+    }
+
+    /**
+     * PythonCallbackHandler expects to be instantiated PER AddonClass instance
+     *  that is to be used as a callback. This is why this cannot be instantiated
+     *  once.
+     *
+     * There is an expectation that this method is called from the Python thread
+     *  that instantiated an AddonClass that has the potential for a callback.
+     *
+     * See RetardedAsyncCallbackHandler for more details.
+     * See PythonCallbackHandler for more details
+     * See PythonCallbackHandler::PythonCallbackHandler for more details
+     */
+    XBMCAddon::CallbackHandler* PythonLanguageHook::GetCallbackHandler()
+    {
+      XBMC_TRACE;
+      return new PythonCallbackHandler();
+    }
+
+    String PythonLanguageHook::GetAddonId()
+    {
+      XBMC_TRACE;
+
+      // Get a reference to the main module
+      // and global dictionary
+      PyObject* main_module = PyImport_AddModule("__main__");
+      if (!main_module)
+      {
+        CLog::Log(LOGDEBUG, "PythonLanguageHook::{}: __main__ returns null", __FUNCTION__);
+        return "";
+      }
+      PyObject* global_dict = PyModule_GetDict(main_module);
+      // Extract a reference to the function "func_name"
+      // from the global dictionary
+      PyObject* pyid = PyDict_GetItemString(global_dict, "__xbmcaddonid__");
+      if (pyid)
+        return PyUnicode_AsUTF8(pyid);
+      return "";
+    }
+
+    String PythonLanguageHook::GetAddonVersion()
+    {
+      XBMC_TRACE;
+      // Get a reference to the main module
+      // and global dictionary
+      PyObject* main_module = PyImport_AddModule("__main__");
+      if (!main_module)
+      {
+        CLog::Log(LOGDEBUG, "PythonLanguageHook::{}: __main__ returns null", __FUNCTION__);
+        return "";
+      }
+      PyObject* global_dict = PyModule_GetDict(main_module);
+      // Extract a reference to the function "func_name"
+      // from the global dictionary
+      PyObject* pyversion = PyDict_GetItemString(global_dict, "__xbmcapiversion__");
+      if (pyversion)
+        return PyUnicode_AsUTF8(pyversion);
+      return "";
+    }
+
+    long PythonLanguageHook::GetInvokerId()
+    {
+      XBMC_TRACE;
+
+      // Get a reference to the main module
+      // and global dictionary
+      PyObject* main_module = PyImport_AddModule("__main__");
+      if (!main_module)
+      {
+        CLog::Log(LOGDEBUG, "PythonLanguageHook::{}: __main__ returns null", __FUNCTION__);
+        return -1;
+      }
+      PyObject* global_dict = PyModule_GetDict(main_module);
+      // Extract a reference to the function "func_name"
+      // from the global dictionary
+      PyObject* pyid = PyDict_GetItemString(global_dict, "__xbmcinvokerid__");
+      if (pyid)
+        return PyLong_AsLong(pyid);
+      return -1;
+    }
+
+    void PythonLanguageHook::RegisterPlayerCallback(IPlayerCallback* player)
+    {
+      XBMC_TRACE;
+      CServiceBroker::GetXBPython().RegisterPythonPlayerCallBack(player);
+    }
+    void PythonLanguageHook::UnregisterPlayerCallback(IPlayerCallback* player)
+    {
+      XBMC_TRACE;
+      CServiceBroker::GetXBPython().UnregisterPythonPlayerCallBack(player);
+    }
+    void PythonLanguageHook::RegisterMonitorCallback(XBMCAddon::xbmc::Monitor* monitor)
+    {
+      XBMC_TRACE;
+      CServiceBroker::GetXBPython().RegisterPythonMonitorCallBack(monitor);
+    }
+    void PythonLanguageHook::UnregisterMonitorCallback(XBMCAddon::xbmc::Monitor* monitor)
+    {
+      XBMC_TRACE;
+      CServiceBroker::GetXBPython().UnregisterPythonMonitorCallBack(monitor);
+    }
+
+    bool PythonLanguageHook::WaitForEvent(CEvent& hEvent, unsigned int milliseconds)
+    {
+      XBMC_TRACE;
+      return CServiceBroker::GetXBPython().WaitForEvent(hEvent, milliseconds);
+    }
+
+    void PythonLanguageHook::RegisterAddonClassInstance(AddonClass* obj)
+    {
+      XBMC_TRACE;
+      std::unique_lock<CCriticalSection> l(*this);
+      obj->Acquire();
+      currentObjects.insert(obj);
+    }
+
+    void PythonLanguageHook::UnregisterAddonClassInstance(AddonClass* obj)
+    {
+      XBMC_TRACE;
+      std::unique_lock<CCriticalSection> l(*this);
+      if (currentObjects.erase(obj) > 0)
+        obj->Release();
+    }
+
+    bool PythonLanguageHook::HasRegisteredAddonClassInstance(AddonClass* obj)
+    {
+      XBMC_TRACE;
+      std::unique_lock<CCriticalSection> l(*this);
+      return currentObjects.find(obj) != currentObjects.end();
+    }
+  }
+}