1 files changed, 188 insertions, 0 deletions
diff --git a/src/mgr/PyModule.h b/src/mgr/PyModule.h
new file mode 100644
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--- /dev/null
+++ b/src/mgr/PyModule.h
@@ -0,0 +1,188 @@
+// -*- 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) 2017 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.
+ */
+
+#pragma once
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+#include <boost/optional.hpp>
+#include "common/Mutex.h"
+#include "Python.h"
+#include "Gil.h"
+#include "mon/MgrMap.h"
+
+
+class MonClient;
+
+std::string handle_pyerror();
+
+std::string peek_pyerror();
+
+/**
+ * A Ceph CLI command description provided from a Python module
+ */
+class ModuleCommand {
+public:
+  std::string cmdstring;
+  std::string helpstring;
+  std::string perm;
+  bool polling;
+
+  // Call the ActivePyModule of this name to handle the command
+  std::string module_name;
+};
+
+class PyModule
+{
+  mutable Mutex lock{"PyModule::lock"};
+private:
+  const std::string module_name;
+  std::string get_site_packages();
+  int load_subclass_of(const char* class_name, PyObject** py_class);
+
+  // Did the MgrMap identify this module as one that should run?
+  bool enabled = false;
+
+  // Did the MgrMap flag this module as always on?
+  bool always_on = false;
+
+  // Did we successfully import this python module and look up symbols?
+  // (i.e. is it possible to instantiate a MgrModule subclass instance?)
+  bool loaded = false;
+
+  // Did the module identify itself as being able to run?
+  // (i.e. should we expect instantiating and calling serve() to work?)
+  bool can_run = false;
+
+  // Did the module encounter an unexpected error while running?
+  // (e.g. throwing an exception from serve())
+  bool failed = false;
+
+  // Populated if loaded, can_run or failed indicates a problem
+  std::string error_string;
+
+  // Helper for loading MODULE_OPTIONS and COMMANDS members
+  int walk_dict_list(
+      const std::string &attr_name,
+      std::function<int(PyObject*)> fn);
+
+  int load_commands();
+  std::vector<ModuleCommand> commands;
+
+  int load_options();
+  std::map<std::string, MgrMap::ModuleOption> options;
+
+public:
+  static std::string config_prefix;
+
+  SafeThreadState pMyThreadState;
+  PyObject *pClass = nullptr;
+  PyObject *pStandbyClass = nullptr;
+
+  explicit PyModule(const std::string &module_name_)
+    : module_name(module_name_)
+  {
+  }
+
+  ~PyModule();
+
+  bool is_option(const std::string &option_name);
+  const std::map<std::string,MgrMap::ModuleOption>& get_options() const {
+    return options;
+  }
+
+  PyObject *get_typed_option_value(
+    const std::string& option,
+    const std::string& value);
+
+  int load(PyThreadState *pMainThreadState);
+#if PY_MAJOR_VERSION >= 3
+  static PyObject* init_ceph_logger();
+  static PyObject* init_ceph_module();
+#else
+  static void init_ceph_logger();
+  static void init_ceph_module();
+#endif
+
+  void set_enabled(const bool enabled_)
+  {
+    enabled = enabled_;
+  }
+
+  void set_always_on(const bool always_on_) {
+    always_on = always_on_;
+  }
+
+  /**
+   * Extend `out` with the contents of `this->commands`
+   */
+  void get_commands(std::vector<ModuleCommand> *out) const
+  {
+    std::lock_guard l(lock);
+    ceph_assert(out != nullptr);
+    out->insert(out->end(), commands.begin(), commands.end());
+  }
+
+
+  /**
+   * Mark the module as failed, recording the reason in the error
+   * string.
+   */
+  void fail(const std::string &reason)
+  {
+    std::lock_guard l(lock);
+    failed = true;
+    error_string = reason;
+  }
+
+  bool is_enabled() const {
+    std::lock_guard l(lock);
+    return enabled || always_on;
+  }
+
+  bool is_failed() const { std::lock_guard l(lock) ; return failed; }
+  bool is_loaded() const { std::lock_guard l(lock) ; return loaded; }
+  bool is_always_on() const { std::lock_guard l(lock) ; return always_on; }
+
+  const std::string &get_name() const {
+    std::lock_guard l(lock) ; return module_name;
+  }
+  const std::string &get_error_string() const {
+    std::lock_guard l(lock) ; return error_string;
+  }
+  bool get_can_run() const {
+    std::lock_guard l(lock) ; return can_run;
+  }
+};
+
+typedef std::shared_ptr<PyModule> PyModuleRef;
+
+class PyModuleConfig {
+public:
+  mutable Mutex lock{"PyModuleConfig::lock"};
+  std::map<std::string, std::string> config;
+
+  PyModuleConfig();
+  
+  PyModuleConfig(PyModuleConfig &mconfig);
+  
+  ~PyModuleConfig();
+
+  void set_config(
+    MonClient *monc,
+    const std::string &module_name,
+    const std::string &key, const boost::optional<std::string>& val);
+
+};