1 files changed, 110 insertions, 0 deletions
diff --git a/src/mgr/PyModuleRunner.cc b/src/mgr/PyModuleRunner.cc
new file mode 100644
index 000000000..e27f7f405
--- /dev/null
+++ b/src/mgr/PyModuleRunner.cc
@@ -0,0 +1,110 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2016 John Spray <john.spray@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+// Python.h comes first because otherwise it clobbers ceph's assert
+#include <Python.h>
+
+#include "PyModule.h"
+
+#include "common/debug.h"
+#include "mgr/Gil.h"
+
+#include "PyModuleRunner.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mgr
+
+
+PyModuleRunner::~PyModuleRunner()
+{
+  Gil gil(py_module->pMyThreadState, true);
+
+  if (pClassInstance) {
+    Py_XDECREF(pClassInstance);
+    pClassInstance = nullptr;
+  }
+}
+
+int PyModuleRunner::serve()
+{
+  ceph_assert(pClassInstance != nullptr);
+
+  // This method is called from a separate OS thread (i.e. a thread not
+  // created by Python), so tell Gil to wrap this in a new thread state.
+  Gil gil(py_module->pMyThreadState, true);
+
+  auto pValue = PyObject_CallMethod(pClassInstance,
+      const_cast<char*>("serve"), nullptr);
+
+  int r = 0;
+  if (pValue != NULL) {
+    Py_DECREF(pValue);
+  } else {
+    // This is not a very informative log message because it's an
+    // unknown/unexpected exception that we can't say much about.
+
+
+    // Get short exception message for the cluster log, before
+    // dumping the full backtrace to the local log.
+    std::string exc_msg = peek_pyerror();
+    
+    clog->error() << "Unhandled exception from module '" << get_name()
+                  << "' while running on mgr." << g_conf()->name.get_id()
+                  << ": " << exc_msg;
+    derr << get_name() << ".serve:" << dendl;
+    derr << handle_pyerror() << dendl;
+
+    py_module->fail(exc_msg);
+
+    return -EINVAL;
+  }
+
+  return r;
+}
+
+void PyModuleRunner::shutdown()
+{
+  ceph_assert(pClassInstance != nullptr);
+
+  Gil gil(py_module->pMyThreadState, true);
+
+  auto pValue = PyObject_CallMethod(pClassInstance,
+      const_cast<char*>("shutdown"), nullptr);
+
+  if (pValue != NULL) {
+    Py_DECREF(pValue);
+  } else {
+    derr << "Failed to invoke shutdown() on " << get_name() << dendl;
+    derr << handle_pyerror() << dendl;
+  }
+
+  dead = true;
+}
+
+void PyModuleRunner::log(const std::string &record)
+{
+#undef dout_prefix
+#define dout_prefix *_dout
+  dout(0) << record << dendl;
+#undef dout_prefix
+#define dout_prefix *_dout << "mgr " << __func__ << " "
+}
+
+void* PyModuleRunner::PyModuleRunnerThread::entry()
+{
+  // No need to acquire the GIL here; the module does it.
+  dout(4) << "Entering thread for " << mod->get_name() << dendl;
+  mod->serve();
+  return nullptr;
+}