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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2016 John Spray <john.spray@redhat.com> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | */ | |
13 | ||
14 | #pragma once | |
15 | ||
16 | #include "Python.h" | |
17 | ||
18 | #include <string> | |
19 | #include <map> | |
20 | ||
21 | #include "common/Thread.h" | |
22 | #include "common/Mutex.h" | |
23 | ||
24 | #include "mgr/Gil.h" | |
25 | #include "mon/MonClient.h" | |
26 | #include "mon/MgrMap.h" | |
27 | #include "mgr/PyModuleRunner.h" | |
28 | ||
29 | typedef std::map<std::string, std::string> PyModuleConfig; | |
30 | ||
31 | /** | |
32 | * State that is read by all modules running in standby mode | |
33 | */ | |
34 | class StandbyPyModuleState | |
35 | { | |
36 | mutable Mutex lock{"StandbyPyModuleState::lock"}; | |
37 | ||
38 | MgrMap mgr_map; | |
39 | PyModuleConfig config_cache; | |
40 | ||
41 | mutable Cond config_loaded; | |
42 | ||
43 | public: | |
44 | ||
45 | bool is_config_loaded = false; | |
46 | ||
47 | void set_mgr_map(const MgrMap &mgr_map_) | |
48 | { | |
49 | Mutex::Locker l(lock); | |
50 | ||
51 | mgr_map = mgr_map_; | |
52 | } | |
53 | ||
54 | void loaded_config(const PyModuleConfig &config_) | |
55 | { | |
56 | Mutex::Locker l(lock); | |
57 | ||
58 | config_cache = config_; | |
59 | is_config_loaded = true; | |
60 | config_loaded.Signal(); | |
61 | } | |
62 | ||
63 | template<typename Callback, typename...Args> | |
64 | void with_mgr_map(Callback&& cb, Args&&...args) const | |
65 | { | |
66 | Mutex::Locker l(lock); | |
67 | std::forward<Callback>(cb)(mgr_map, std::forward<Args>(args)...); | |
68 | } | |
69 | ||
70 | template<typename Callback, typename...Args> | |
71 | auto with_config(Callback&& cb, Args&&... args) const -> | |
72 | decltype(cb(config_cache, std::forward<Args>(args)...)) { | |
73 | Mutex::Locker l(lock); | |
74 | ||
75 | if (!is_config_loaded) { | |
76 | config_loaded.Wait(lock); | |
77 | } | |
78 | ||
79 | return std::forward<Callback>(cb)(config_cache, std::forward<Args>(args)...); | |
80 | } | |
81 | }; | |
82 | ||
83 | ||
84 | class StandbyPyModule : public PyModuleRunner | |
85 | { | |
86 | StandbyPyModuleState &state; | |
87 | ||
88 | public: | |
89 | ||
90 | StandbyPyModule( | |
91 | StandbyPyModuleState &state_, | |
92 | const std::string &module_name_, | |
93 | PyObject *pClass_, | |
94 | const SafeThreadState &pMyThreadState_) | |
95 | : | |
96 | PyModuleRunner(module_name_, pClass_, pMyThreadState_), | |
97 | state(state_) | |
98 | { | |
99 | } | |
100 | ||
101 | bool get_config(const std::string &key, std::string *value) const; | |
102 | std::string get_active_uri() const; | |
103 | ||
104 | int load(); | |
105 | }; | |
106 | ||
107 | class StandbyPyModules | |
108 | { | |
109 | private: | |
110 | mutable Mutex lock{"StandbyPyModules::lock"}; | |
111 | std::map<std::string, std::unique_ptr<StandbyPyModule>> modules; | |
112 | ||
113 | MonClient *monc; | |
114 | ||
115 | StandbyPyModuleState state; | |
116 | ||
117 | void load_config(); | |
118 | class LoadConfigThread : public Thread | |
119 | { | |
120 | protected: | |
121 | MonClient *monc; | |
122 | StandbyPyModuleState *state; | |
123 | public: | |
124 | LoadConfigThread(MonClient *monc_, StandbyPyModuleState *state_) | |
125 | : monc(monc_), state(state_) | |
126 | {} | |
127 | void *entry() override; | |
128 | }; | |
129 | ||
130 | LoadConfigThread load_config_thread; | |
131 | ||
132 | public: | |
133 | ||
134 | StandbyPyModules( | |
135 | MonClient *monc_, | |
136 | const MgrMap &mgr_map_); | |
137 | ||
138 | int start_one(std::string const &module_name, | |
139 | PyObject *pClass, | |
140 | const SafeThreadState &pMyThreadState); | |
141 | ||
142 | void shutdown(); | |
143 | ||
144 | void handle_mgr_map(const MgrMap &mgr_map) | |
145 | { | |
146 | state.set_mgr_map(mgr_map); | |
147 | } | |
148 | ||
149 | }; |