--- /dev/null
+// -*- 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) 2011 New Dream Network
+ *
+ * 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.
+ *
+ */
+
+#ifndef CEPH_CEPHCONTEXT_H
+#define CEPH_CEPHCONTEXT_H
+
+#include <atomic>
+#include <set>
+#include <boost/noncopyable.hpp>
+
+#include "common/cmdparse.h"
+#include "common/code_environment.h"
+#include "crush/CrushLocation.h"
+#include "include/Spinlock.h"
+
+class AdminSocket;
+class CephContextServiceThread;
+class PerfCountersCollection;
+class PerfCounters;
+class md_config_obs_t;
+struct md_config_t;
+class CephContextHook;
+class CephContextObs;
+class CryptoHandler;
+
+namespace ceph {
+ class PluginRegistry;
+ class HeartbeatMap;
+ namespace logging {
+ class Log;
+ }
+}
+
+/* A CephContext represents the context held by a single library user.
+ * There can be multiple CephContexts in the same process.
+ *
+ * For daemons and utility programs, there will be only one CephContext. The
+ * CephContext contains the configuration, the dout object, and anything else
+ * that you might want to pass to libcommon with every function call.
+ */
+class CephContext {
+public:
+ CephContext(uint32_t module_type_,
+ enum code_environment_t code_env=CODE_ENVIRONMENT_UTILITY,
+ int init_flags_ = 0);
+
+ // ref count!
+private:
+ ~CephContext();
+ std::atomic<unsigned> nref;
+public:
+ CephContext *get() {
+ ++nref;
+ return this;
+ }
+ void put();
+
+ md_config_t *_conf;
+ ceph::logging::Log *_log;
+
+ /* init ceph::crypto */
+ void init_crypto();
+
+ /* Start the Ceph Context's service thread */
+ void start_service_thread();
+
+ /* Reopen the log files */
+ void reopen_logs();
+
+ /* Get the module type (client, mon, osd, mds, etc.) */
+ uint32_t get_module_type() const;
+
+ void set_init_flags(int flags);
+ int get_init_flags() const;
+
+ /* Get the PerfCountersCollection of this CephContext */
+ PerfCountersCollection *get_perfcounters_collection();
+
+ ceph::HeartbeatMap *get_heartbeat_map() {
+ return _heartbeat_map;
+ }
+
+ /**
+ * Enable the performance counter, currently we only have counter for the
+ * number of total/unhealthy workers.
+ */
+ void enable_perf_counter();
+
+ /**
+ * Disable the performance counter.
+ */
+ void disable_perf_counter();
+
+ /**
+ * Refresh perf counter values.
+ */
+ void refresh_perf_values();
+
+ /**
+ * Get the admin socket associated with this CephContext.
+ *
+ * Currently there is always an admin socket object,
+ * so this will never return NULL.
+ *
+ * @return the admin socket
+ */
+ AdminSocket *get_admin_socket();
+
+ /**
+ * process an admin socket command
+ */
+ void do_command(std::string command, cmdmap_t& cmdmap, std::string format,
+ ceph::bufferlist *out);
+
+ template<typename T>
+ void lookup_or_create_singleton_object(T*& p, const std::string &name) {
+ ceph_spin_lock(&_associated_objs_lock);
+ if (!_associated_objs.count(name)) {
+ p = new T(this);
+ _associated_objs[name] = new TypedSingletonWrapper<T>(p);
+ } else {
+ TypedSingletonWrapper<T> *wrapper =
+ dynamic_cast<TypedSingletonWrapper<T> *>(_associated_objs[name]);
+ assert(wrapper != NULL);
+ p = wrapper->singleton;
+ }
+ ceph_spin_unlock(&_associated_objs_lock);
+ }
+ /**
+ * get a crypto handler
+ */
+ CryptoHandler *get_crypto_handler(int type);
+
+ /// check if experimental feature is enable, and emit appropriate warnings
+ bool check_experimental_feature_enabled(const std::string& feature);
+ bool check_experimental_feature_enabled(const std::string& feature,
+ std::ostream *message);
+
+ PluginRegistry *get_plugin_registry() {
+ return _plugin_registry;
+ }
+
+ void set_uid_gid(uid_t u, gid_t g) {
+ _set_uid = u;
+ _set_gid = g;
+ }
+ uid_t get_set_uid() const {
+ return _set_uid;
+ }
+ gid_t get_set_gid() const {
+ return _set_gid;
+ }
+
+ void set_uid_gid_strings(std::string u, std::string g) {
+ _set_uid_string = u;
+ _set_gid_string = g;
+ }
+ std::string get_set_uid_string() const {
+ return _set_uid_string;
+ }
+ std::string get_set_gid_string() const {
+ return _set_gid_string;
+ }
+
+ class ForkWatcher {
+ public:
+ virtual ~ForkWatcher() {}
+ virtual void handle_pre_fork() = 0;
+ virtual void handle_post_fork() = 0;
+ };
+
+ void register_fork_watcher(ForkWatcher *w) {
+ ceph_spin_lock(&_fork_watchers_lock);
+ _fork_watchers.push_back(w);
+ ceph_spin_unlock(&_fork_watchers_lock);
+ }
+
+ void notify_pre_fork() {
+ ceph_spin_lock(&_fork_watchers_lock);
+ for (auto &&t : _fork_watchers)
+ t->handle_pre_fork();
+ ceph_spin_unlock(&_fork_watchers_lock);
+ }
+
+ void notify_post_fork() {
+ ceph_spin_lock(&_fork_watchers_lock);
+ for (auto &&t : _fork_watchers)
+ t->handle_post_fork();
+ ceph_spin_unlock(&_fork_watchers_lock);
+ }
+
+private:
+ struct SingletonWrapper : boost::noncopyable {
+ virtual ~SingletonWrapper() {}
+ };
+
+ template <typename T>
+ struct TypedSingletonWrapper : public SingletonWrapper {
+ TypedSingletonWrapper(T *p) : singleton(p) {
+ }
+ ~TypedSingletonWrapper() override {
+ delete singleton;
+ }
+
+ T *singleton;
+ };
+
+ CephContext(const CephContext &rhs);
+ CephContext &operator=(const CephContext &rhs);
+
+ /* Stop and join the Ceph Context's service thread */
+ void join_service_thread();
+
+ uint32_t _module_type;
+
+ int _init_flags;
+
+ uid_t _set_uid; ///< uid to drop privs to
+ gid_t _set_gid; ///< gid to drop privs to
+ std::string _set_uid_string;
+ std::string _set_gid_string;
+
+ bool _crypto_inited;
+
+ /* libcommon service thread.
+ * SIGHUP wakes this thread, which then reopens logfiles */
+ friend class CephContextServiceThread;
+ CephContextServiceThread *_service_thread;
+
+ md_config_obs_t *_log_obs;
+
+ /* The admin socket associated with this context */
+ AdminSocket *_admin_socket;
+
+ /* lock which protects service thread creation, destruction, etc. */
+ ceph_spinlock_t _service_thread_lock;
+
+ /* The collection of profiling loggers associated with this context */
+ PerfCountersCollection *_perf_counters_collection;
+
+ md_config_obs_t *_perf_counters_conf_obs;
+
+ CephContextHook *_admin_hook;
+
+ ceph::HeartbeatMap *_heartbeat_map;
+
+ ceph_spinlock_t _associated_objs_lock;
+ std::map<std::string, SingletonWrapper*> _associated_objs;
+
+ ceph_spinlock_t _fork_watchers_lock;
+ std::vector<ForkWatcher*> _fork_watchers;
+
+ // crypto
+ CryptoHandler *_crypto_none;
+ CryptoHandler *_crypto_aes;
+
+ // experimental
+ CephContextObs *_cct_obs;
+ ceph_spinlock_t _feature_lock;
+ std::set<std::string> _experimental_features;
+
+ PluginRegistry *_plugin_registry;
+
+ md_config_obs_t *_lockdep_obs;
+
+public:
+ CrushLocation crush_location;
+private:
+
+ enum {
+ l_cct_first,
+ l_cct_total_workers,
+ l_cct_unhealthy_workers,
+ l_cct_last
+ };
+ PerfCounters *_cct_perf;
+ ceph_spinlock_t _cct_perf_lock;
+
+ friend class CephContextObs;
+};
+
+#endif
Code Review / stor4nfv.git / blobdiff