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// -*- 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);
};
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