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+/*
+ *  Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License
+ */
+/**
+ * @file        src/include/cynara-monitor.h
+ * @author      Aleksander Zdyb <a.zdyb@samsung.com>
+ * @version     1.0
+ * @brief       This file contains client APIs of Cynara monitoring.
+ */
+
+#ifndef CYNARA_MONITOR_H
+#define CYNARA_MONITOR_H
+
+#include <stddef.h>
+#include <time.h>
+
+#include <cynara/cynara-error.h>
+#include <cynara/cynara-limits.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct cynara_monitor_configuration cynara_monitor_configuration;
+typedef struct cynara_monitor cynara_monitor;
+typedef struct cynara_monitor_entry cynara_monitor_entry;
+
+/**
+ * \par Description:
+ * Initializes cynara_monitor_configuration. Creates structure used in following configuration
+ * API calls.
+ *
+ * \par Purpose:
+ * For configuration parameter to be used in cynara_monitor_initialize() function, this API must be
+ * called before any other Cynara monitor configuration API function.
+ * It will create cynara_monitor_configuration structure, an optional parameter
+ * of Cynara monitor initialization.
+ *
+ * \par Typical use case:
+ * Once before setting parameters of Cynara monitor configuration and passing to
+ * cynara_monitor_initialize().
+ *
+ * \par Method of function operation:
+ * This API initializes inner library structures and in case of success returns pointer
+ * to created cynara_monitor_configuration structure.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safety:
+ * \parblock
+ * This function is NOT thread-safe. If this function is called simultaneously with other functions
+ * from described API in different threads, they must be put into protected critical section.
+ *
+ * \par Important notes:
+ * Structure cynara_monitor_configuration created by cynara_monitor_configuration_create() call
+ * should be released with cynara_monitor_configuration_destroy().
+ * Structure cynara_monitor_configuration should be destroyed after passing it to
+ * cynara_monitor_initialize().
+ * \endparblock
+ *
+ * \param[out] pp_conf Placeholder for created cynara_monitor_configuration structure.
+ *
+ * \return CYNARA_API_SUCCESS on success
+ *         or negative error code on error.
+ */
+int cynara_monitor_configuration_create(cynara_monitor_configuration **pp_conf);
+
+/**
+ * \par Description:
+ * Releases cynara_monitor_configuration structure created
+ * with cynara_monitor_configuration_create().
+ *
+ * \par Purpose:
+ * This API should be used to clean up after usage of cynara_monitor_configuration.
+ *
+ * \par Typical use case:
+ * Once cynara_monitor_configuration is not needed.
+ *
+ * \par Method of function operation:
+ * This API releases inner library structure and destroys cynara_monitor_configuration structure.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safety:
+ * This function is NOT thread-safe. If this function is called simultaneously with other functions
+ * from described API in different threads, they must be put into protected critical section.
+ *
+ * \param[in] p_conf cynara_monitor_configuration structure. If NULL, the call has no effect.
+ */
+void cynara_monitor_configuration_destroy(cynara_monitor_configuration *p_conf);
+
+/**
+ * \par Description:
+ * Set monitor entries buffer size.
+ *
+ * \par Purpose:
+ * This API is used to change default number of monitor entries stored on server side
+ * before returning them to client of libcynara-monitor. Buffer size cannot exceed value
+ * of CYNARA_MAX_MONITOR_BUFFER_SIZE, otherwise CYNARA_API_INPUT_PARAM will be returned.
+ *
+ * \par Typical use case:
+ * Once after cynara_configuration is created with cynara_monitor_configuration_create()
+ * and before passing configuration to cynara_monitor_configuration().
+ *
+ * \par Method of function operation:
+ * This API initializes buffer with given capacity.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safety:
+ * This function is NOT thread-safe. If this function is called simultaneously with other functions
+ * from described API in different threads, they must be put into protected critical section.
+ *
+ * \par Important notes:
+ * After passing cynara_configuration to cynara_monitor_initialize() calling this API will have
+ * no effect.
+ *
+ * If buffer size is not set with cynara_monitor_configuration_set_buffer_size(),
+ * a default size will be taken.
+ * \endparblock
+ *
+ * \param[in] p_conf cynara_monitor_configuration structure pointer.
+ * \param[in] buffer_size buffer size to be set.
+ *
+ * \return CYNARA_API_SUCCESS on success
+ *        or negative error code on error.
+ */
+int cynara_monitor_configuration_set_buffer_size(cynara_monitor_configuration *p_conf,
+                                                 size_t buffer_size);
+
+/**
+ * \par Description:
+ * Initializes cynara-monitor library with given configuration.
+ * Creates structure used in following API calls.
+ *
+ * \par Purpose:
+ * This API must be used by prior calling cynara_monitor_entries_get() function.
+ *
+ * \par Typical use case:
+ * Once before a service can call cynara_monitor_entries_get().
+ *
+ * \par Method of function operation:
+ * This API initializes inner library structures and in case of success
+ * creates cynara_monitor structure.
+ *
+ * \par Sync (or) Async:
+ * This is a Synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is NOT thread-safe. If this function is called simultaneously with other functions
+ * from described API in different threads, they must be put into protected critical section.
+ *
+ * \par Important notes:
+ * Structure cynara_monitor created by cynara_monitor_initialize() call should be released
+ * with cynara_monitor_finish().
+ *
+ * \param[out] pp_cynara_monitor Placeholder for created cynara_monitor structure.
+ * \param[in] p_conf Configuration for cynara-monitor library. NULL for default parameters.
+ *
+ * \return CYNARA_API_SUCCESS on success, or error code on error.
+ */
+int cynara_monitor_initialize(cynara_monitor **pp_cynara_monitor,
+                              const cynara_monitor_configuration *p_conf);
+
+/**
+ * \par Description:
+ * Releases cynara-monitor library and destroys structure created with cynara_monitor_initialize().
+ *
+ * \par Purpose:
+ * This API should be used to clean up after the usage of cynara-monitor library.
+ *
+ * \par Typical use case:
+ * Once after last call to cynara_monitor_entries_get().
+ *
+ * \par Method of function operation:
+ * This API releases inner library structures and destroys cynara_monitor structure.
+ *
+ * \par Sync (or) Async:
+ * This is a Synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is NOT thread-safe. If this function is called simultaneously with other functions
+ * from described API in different threads, they must be put into protected critical section.
+ *
+ * \par Important notes:
+ * No other call to libcynara-monitor should be made after call to cynara_monitor_finish().
+ * This function cannot be called, if cynara_monitor_entries_get() haven't returned yet.
+ *
+ * \param[in] p_cynara_monitor Cynara monitor structure.
+ *
+ * \return CYNARA_API_SUCCESS on success, or error code on error.
+ */
+int cynara_monitor_finish(cynara_monitor *p_cynara_monitor);
+
+/**
+ * \brief Returns monitor entries.
+ *
+ * \par Description:
+ *
+ * Returns all available monitor entries right after the size of buffer reaches set limit.
+ *
+ * \par Purpose:
+ * This API should be used to get available monitor entries.
+ *
+ * \par Typical use case:
+ * Gathering information about possible accesses checked in Cynara by individual services.
+ *
+ * \par Method of function operation:
+ * \parblock
+ * Each call to cynara_check() made by individual services are logged. The logs can be obtained
+ * by privileged clients with usage of libcynara-monitor (this API).
+ *
+ * In case of successful call CYNARA_API_SUCCESS is returned and *monitor_entries points
+ * to newly created array of pointers to cynara_monitor_entry. It is responsibility
+ * of the caller to release entries with cynara_monitor_entries_free().
+ *
+ * The function blocks until the size of buffer reaches set limit or cynara_monitor_entries_flush()
+ * is called from another thread.
+ * \endparblock
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \par Important notes:
+ * Although this function is thread-safe, no multiple calls are allowed.
+ *
+ * \param[in] p_cynara_monitor cynara_monitor structure.
+ * \param[out] monitor_entries placeholder for NULL terminated array of pointers to
+ *             monitor_entries structures.
+ *
+ * \return CYNARA_API_SUCCESS on success, or error code otherwise.
+ */
+int cynara_monitor_entries_get(cynara_monitor *p_cynara_monitor,
+                               cynara_monitor_entry ***monitor_entries);
+
+/**
+ * \brief Makes cynara_monitor_entries_get() return immediately.
+ *
+ * \par Description:
+ *
+ * When called from another thread, makes cynara_monitor_entries_get() return immediately.
+ *
+ * \par Purpose:
+ * This API should be used to make cynara_monitor_entries_get() return immediately.
+ *
+ * \par Typical use case:
+ * User of libcynara-monitor wants to immediately get get monitor entries and/or make
+ * cynara_monitor_entries_get() return without waiting for full batch of entries.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \param[in] p_cynara_monitor cynara_monitor structure.
+ *
+ * \return CYNARA_API_SUCCESS on success, or error code otherwise.
+ */
+int cynara_monitor_entries_flush(cynara_monitor *p_cynara_monitor);
+
+/**
+ * \brief Releases monitor entries.
+ *
+ * \par Description:
+ *
+ * Releases monitor entries obtained with cynara_monitor_entries_get().
+ *
+ * \par Purpose:
+ * This API should be used to release array of cynara_monitor_entry obtained
+ * with cynara_monitor_entries_get.
+ *
+ * \par Typical use case:
+ * When user obtained all needed data from the entries and won't be accessing the
+ * memory any more.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \param[in] monitor_entries NULL terminated array of cynara_monitor_entry to be released.
+ */
+void cynara_monitor_entries_free(cynara_monitor_entry **monitor_entries);
+
+/**
+ * \brief Gets client from monitor_entry
+ *
+ * \par Description:
+ * Gives access to client field of monitor_entry given as a parameter.
+ * Please refer to cynara_check() in cynara-client.h for more information on client field.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \par Important notes:
+ * The returned pointer is valid as long as given monitor_entry is.
+ *
+ * \param[in] monitor_entry cynara_monitor_entry to be accessed.
+ *
+ * \return valid const char * pointer or NULL in case of error.
+ */
+const char *cynara_monitor_entry_get_client(const cynara_monitor_entry *monitor_entry);
+
+/**
+ * \brief Gets user from monitor_entry
+ *
+ * \par Description:
+ * Gives access to user field of monitor_entry given as a parameter.
+ * Please refer to cynara_check() in cynara-client.h for more information on user field.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \par Important notes:
+ * The returned pointer is valid as long as given monitor_entry is.
+ *
+ * \param[in] monitor_entry cynara_monitor_entry to be accessed.
+ *
+ * \return valid const char * pointer or NULL in case of error.
+ */
+const char *cynara_monitor_entry_get_user(const cynara_monitor_entry *monitor_entry);
+
+/**
+ * \brief Gets privilege from monitor_entry
+ *
+ * \par Description:
+ * Gives access to privilege field of monitor_entry given as a parameter.
+ * Please refer to cynara_check() in cynara-client.h for more information on privilege field.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \par Important notes:
+ * The returned pointer is valid as long as given monitor_entry is.
+ *
+ * \param[in] monitor_entry cynara_monitor_entry to be accessed.
+ *
+ * \return valid const char * pointer or NULL in case of error.
+ */
+const char *cynara_monitor_entry_get_privilege(const cynara_monitor_entry *monitor_entry);
+
+/**
+ * \brief Gets result from monitor_entry
+ *
+ * \par Description:
+ * Gives access to result field of monitor_entry given as a parameter.
+ * In case of successful get, the result is one of CYNARA_API_ACCESS_ALLOWED
+ * or CYNARA_API_ACCESS_DENIED. In case of error a negative code error is returned.
+ * Please refer to cynara-error.h for more information.
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \param[in] monitor_entry cynara_monitor_entry to be accessed.
+ *
+ * \return CYNARA_API_ACCESS_ALLOWED on access allowed, CYNARA_API_ACCESS_DENIED on access denial
+ * or other error code on error.
+ */
+int cynara_monitor_entry_get_result(const cynara_monitor_entry *monitor_entry);
+
+/**
+ * \brief Gets timestamp from monitor_entry
+ *
+ * \par Description:
+ * Gives access to timestamp field of monitor_entry given as a parameter.
+ * This is the time of cynara_check() being invoked. Please refer to cynara-client.h
+ * for more information about cynara_check().
+ *
+ * \par Sync (or) Async:
+ * This is a synchronous API.
+ *
+ * \par Thread-safeness:
+ * This function is thread-safe.
+ *
+ * \par Important notes:
+ * The returned pointer is valid as long as given monitor_entry is.
+ *
+ * \param[in] monitor_entry cynara_monitor_entry to be accessed.
+ *
+ * \return valid const istruct timspec * pointer or NULL in case of error.
+ */
+const struct timespec *cynara_monitor_entry_get_timestamp(
+        const cynara_monitor_entry *monitor_entry);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CYNARA_MONITOR_H */