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+/**
+ * collectd - src/daemon/plugin.h
+ * Copyright (C) 2005-2014 Florian octo Forster
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Florian octo Forster <octo at collectd.org>
+ * Sebastian Harl <sh at tokkee.org>
+ **/
+
+#ifndef PLUGIN_H
+#define PLUGIN_H
+
+#include "collectd.h"
+
+#include "configfile.h"
+#include "meta_data.h"
+#include "utils_time.h"
+
+#include <inttypes.h>
+#include <pthread.h>
+
+#define DS_TYPE_COUNTER 0
+#define DS_TYPE_GAUGE 1
+#define DS_TYPE_DERIVE 2
+#define DS_TYPE_ABSOLUTE 3
+
+#define DS_TYPE_TO_STRING(t) \
+ (t == DS_TYPE_COUNTER) \
+ ? "counter" \
+ : (t == DS_TYPE_GAUGE) \
+ ? "gauge" \
+ : (t == DS_TYPE_DERIVE) \
+ ? "derive" \
+ : (t == DS_TYPE_ABSOLUTE) ? "absolute" : "unknown"
+
+#ifndef LOG_ERR
+#define LOG_ERR 3
+#endif
+#ifndef LOG_WARNING
+#define LOG_WARNING 4
+#endif
+#ifndef LOG_NOTICE
+#define LOG_NOTICE 5
+#endif
+#ifndef LOG_INFO
+#define LOG_INFO 6
+#endif
+#ifndef LOG_DEBUG
+#define LOG_DEBUG 7
+#endif
+
+#define NOTIF_MAX_MSG_LEN 256
+
+#define NOTIF_FAILURE 1
+#define NOTIF_WARNING 2
+#define NOTIF_OKAY 4
+
+#define plugin_interval (plugin_get_ctx().interval)
+
+/*
+ * Public data types
+ */
+struct identifier_s {
+ char *host;
+ char *plugin;
+ char *plugin_instance;
+ char *type;
+ char *type_instance;
+};
+typedef struct identifier_s identifier_t;
+
+typedef unsigned long long counter_t;
+typedef double gauge_t;
+typedef int64_t derive_t;
+typedef uint64_t absolute_t;
+
+union value_u {
+ counter_t counter;
+ gauge_t gauge;
+ derive_t derive;
+ absolute_t absolute;
+};
+typedef union value_u value_t;
+
+struct value_list_s {
+ value_t *values;
+ size_t values_len;
+ cdtime_t time;
+ cdtime_t interval;
+ char host[DATA_MAX_NAME_LEN];
+ char plugin[DATA_MAX_NAME_LEN];
+ char plugin_instance[DATA_MAX_NAME_LEN];
+ char type[DATA_MAX_NAME_LEN];
+ char type_instance[DATA_MAX_NAME_LEN];
+ meta_data_t *meta;
+};
+typedef struct value_list_s value_list_t;
+
+#define VALUE_LIST_INIT \
+ { .values = NULL, .meta = NULL }
+
+struct data_source_s {
+ char name[DATA_MAX_NAME_LEN];
+ int type;
+ double min;
+ double max;
+};
+typedef struct data_source_s data_source_t;
+
+struct data_set_s {
+ char type[DATA_MAX_NAME_LEN];
+ size_t ds_num;
+ data_source_t *ds;
+};
+typedef struct data_set_s data_set_t;
+
+enum notification_meta_type_e {
+ NM_TYPE_STRING,
+ NM_TYPE_SIGNED_INT,
+ NM_TYPE_UNSIGNED_INT,
+ NM_TYPE_DOUBLE,
+ NM_TYPE_BOOLEAN
+};
+
+typedef struct notification_meta_s {
+ char name[DATA_MAX_NAME_LEN];
+ enum notification_meta_type_e type;
+ union {
+ const char *nm_string;
+ int64_t nm_signed_int;
+ uint64_t nm_unsigned_int;
+ double nm_double;
+ bool nm_boolean;
+ } nm_value;
+ struct notification_meta_s *next;
+} notification_meta_t;
+
+typedef struct notification_s {
+ int severity;
+ cdtime_t time;
+ char message[NOTIF_MAX_MSG_LEN];
+ char host[DATA_MAX_NAME_LEN];
+ char plugin[DATA_MAX_NAME_LEN];
+ char plugin_instance[DATA_MAX_NAME_LEN];
+ char type[DATA_MAX_NAME_LEN];
+ char type_instance[DATA_MAX_NAME_LEN];
+ notification_meta_t *meta;
+} notification_t;
+
+struct user_data_s {
+ void *data;
+ void (*free_func)(void *);
+};
+typedef struct user_data_s user_data_t;
+
+enum cache_event_type_e { CE_VALUE_NEW, CE_VALUE_UPDATE, CE_VALUE_EXPIRED };
+
+typedef struct cache_event_s {
+ enum cache_event_type_e type;
+ const value_list_t *value_list;
+ const char *value_list_name;
+ int ret;
+} cache_event_t;
+
+struct plugin_ctx_s {
+ char *name;
+ cdtime_t interval;
+ cdtime_t flush_interval;
+ cdtime_t flush_timeout;
+};
+typedef struct plugin_ctx_s plugin_ctx_t;
+
+/*
+ * Callback types
+ */
+typedef int (*plugin_init_cb)(void);
+typedef int (*plugin_read_cb)(user_data_t *);
+typedef int (*plugin_write_cb)(const data_set_t *, const value_list_t *,
+ user_data_t *);
+typedef int (*plugin_flush_cb)(cdtime_t timeout, const char *identifier,
+ user_data_t *);
+/* "missing" callback. Returns less than zero on failure, zero if other
+ * callbacks should be called, greater than zero if no more callbacks should be
+ * called. */
+typedef int (*plugin_missing_cb)(const value_list_t *, user_data_t *);
+/* "cache event" callback. CE_VALUE_NEW events are sent to all registered
+ * callbacks. Callback should check if it interested in further CE_VALUE_UPDATE
+ * and CE_VALUE_EXPIRED events for metric and set event->ret = 1 if so.
+ */
+typedef int (*plugin_cache_event_cb)(cache_event_t *, user_data_t *);
+typedef void (*plugin_log_cb)(int severity, const char *message, user_data_t *);
+typedef int (*plugin_shutdown_cb)(void);
+typedef int (*plugin_notification_cb)(const notification_t *, user_data_t *);
+/*
+ * NAME
+ * plugin_set_dir
+ *
+ * DESCRIPTION
+ * Sets the current `plugindir'
+ *
+ * ARGUMENTS
+ * `dir' Path to the plugin directory
+ *
+ * NOTES
+ * If `dir' is NULL the compiled in default `PLUGINDIR' is used.
+ */
+void plugin_set_dir(const char *dir);
+
+/*
+ * NAME
+ * plugin_load
+ *
+ * DESCRIPTION
+ * Searches the current `plugindir' (see `plugin_set_dir') for the plugin
+ * named $type and loads it. Afterwards the plugin's `module_register'
+ * function is called, which then calls `plugin_register' to register callback
+ * functions.
+ *
+ * ARGUMENTS
+ * `name' Name of the plugin to load.
+ * `global' Make this plugins symbols available for other shared libraries.
+ *
+ * RETURN VALUE
+ * Returns zero upon success, a value greater than zero if no plugin was found
+ * and a value below zero if an error occurs.
+ *
+ * NOTES
+ * Re-loading an already loaded module is detected and zero is returned in
+ * this case.
+ */
+int plugin_load(const char *name, bool global);
+bool plugin_is_loaded(char const *name);
+
+int plugin_init_all(void);
+void plugin_read_all(void);
+int plugin_read_all_once(void);
+int plugin_shutdown_all(void);
+
+/*
+ * NAME
+ * plugin_write
+ *
+ * DESCRIPTION
+ * Calls the write function of the given plugin with the provided data set and
+ * value list. It differs from `plugin_dispatch_values' in that it does not
+ * update the cache, does not do threshold checking, call the chain subsystem
+ * and so on. It looks up the requested plugin and invokes the function, end
+ * of story.
+ *
+ * ARGUMENTS
+ * plugin Name of the plugin. If NULL, the value is sent to all registered
+ * write functions.
+ * ds Pointer to the data_set_t structure. If NULL, the data set is
+ * looked up according to the `type' member in the `vl' argument.
+ * vl The actual value to be processed. Must not be NULL.
+ *
+ * RETURN VALUE
+ * Returns zero upon success or non-zero if an error occurred. If `plugin' is
+ * NULL and more than one plugin is called, an error is only returned if *all*
+ * plugins fail.
+ *
+ * NOTES
+ * This is the function used by the `write' built-in target. May be used by
+ * other target plugins.
+ */
+int plugin_write(const char *plugin, const data_set_t *ds,
+ const value_list_t *vl);
+
+int plugin_flush(const char *plugin, cdtime_t timeout, const char *identifier);
+
+/*
+ * The `plugin_register_*' functions are used to make `config', `init',
+ * `read', `write' and `shutdown' functions known to the plugin
+ * infrastructure. Also, the data-formats are made public like this.
+ */
+int plugin_register_config(const char *name,
+ int (*callback)(const char *key, const char *val),
+ const char **keys, int keys_num);
+int plugin_register_complex_config(const char *type,
+ int (*callback)(oconfig_item_t *));
+int plugin_register_init(const char *name, plugin_init_cb callback);
+int plugin_register_read(const char *name, int (*callback)(void));
+/* "user_data" will be freed automatically, unless
+ * "plugin_register_complex_read" returns an error (non-zero). */
+int plugin_register_complex_read(const char *group, const char *name,
+ plugin_read_cb callback, cdtime_t interval,
+ user_data_t const *user_data);
+int plugin_register_write(const char *name, plugin_write_cb callback,
+ user_data_t const *user_data);
+int plugin_register_flush(const char *name, plugin_flush_cb callback,
+ user_data_t const *user_data);
+int plugin_register_missing(const char *name, plugin_missing_cb callback,
+ user_data_t const *user_data);
+int plugin_register_cache_event(const char *name,
+ plugin_cache_event_cb callback,
+ user_data_t const *ud);
+int plugin_register_shutdown(const char *name, plugin_shutdown_cb callback);
+int plugin_register_data_set(const data_set_t *ds);
+int plugin_register_log(const char *name, plugin_log_cb callback,
+ user_data_t const *user_data);
+int plugin_register_notification(const char *name,
+ plugin_notification_cb callback,
+ user_data_t const *user_data);
+
+int plugin_unregister_config(const char *name);
+int plugin_unregister_complex_config(const char *name);
+int plugin_unregister_init(const char *name);
+int plugin_unregister_read(const char *name);
+int plugin_unregister_read_group(const char *group);
+int plugin_unregister_write(const char *name);
+int plugin_unregister_flush(const char *name);
+int plugin_unregister_missing(const char *name);
+int plugin_unregister_cache_event(const char *name);
+int plugin_unregister_shutdown(const char *name);
+int plugin_unregister_data_set(const char *name);
+int plugin_unregister_log(const char *name);
+int plugin_unregister_notification(const char *name);
+
+/*
+ * NAME
+ * plugin_log_available_writers
+ *
+ * DESCRIPTION
+ * This function can be called to output a list of _all_ registered
+ * writers to the logfacility.
+ * Since some writers dynamically build their name it can be hard for
+ * the configuring person to know it. This function will fill this gap.
+ */
+void plugin_log_available_writers(void);
+
+/*
+ * NAME
+ * plugin_dispatch_values
+ *
+ * DESCRIPTION
+ * This function is called by reading processes with the values they've
+ * aquired. The function fetches the data-set definition (that has been
+ * registered using `plugin_register_data_set') and calls _all_ registered
+ * write-functions.
+ *
+ * ARGUMENTS
+ * `vl' Value list of the values that have been read by a `read'
+ * function.
+ */
+int plugin_dispatch_values(value_list_t const *vl);
+
+/*
+ * NAME
+ * plugin_dispatch_multivalue
+ *
+ * SYNOPSIS
+ * plugin_dispatch_multivalue (vl, true, DS_TYPE_GAUGE,
+ * "free", 42.0,
+ * "used", 58.0,
+ * NULL);
+ *
+ * DESCRIPTION
+ * Takes a list of type instances and values and dispatches that in a batch,
+ * making sure that all values have the same time stamp. If "store_percentage"
+ * is set to true, the "type" is set to "percent" and a percentage is
+ * calculated and dispatched, rather than the absolute values. Values that are
+ * NaN are dispatched as NaN and will not influence the total.
+ *
+ * The variadic arguments is a list of type_instance / type pairs, that are
+ * interpreted as type "char const *" and type, encoded by their corresponding
+ * "store_type":
+ *
+ * - "gauge_t" when "DS_TYPE_GAUGE"
+ * - "absolute_t" when "DS_TYPE_ABSOLUTE"
+ * - "derive_t" when "DS_TYPE_DERIVE"
+ * - "counter_t" when "DS_TYPE_COUNTER"
+ *
+ * The last argument must be
+ * a NULL pointer to signal end-of-list.
+ *
+ * RETURNS
+ * The number of values it failed to dispatch (zero on success).
+ */
+__attribute__((sentinel)) int plugin_dispatch_multivalue(value_list_t const *vl,
+ bool store_percentage,
+ int store_type, ...);
+
+int plugin_dispatch_missing(const value_list_t *vl);
+void plugin_dispatch_cache_event(enum cache_event_type_e event_type,
+ unsigned long callbacks_mask, const char *name,
+ const value_list_t *vl);
+
+int plugin_dispatch_notification(const notification_t *notif);
+
+void plugin_log(int level, const char *format, ...)
+ __attribute__((format(printf, 2, 3)));
+
+/* These functions return the parsed severity or less than zero on failure. */
+int parse_log_severity(const char *severity);
+int parse_notif_severity(const char *severity);
+
+#define ERROR(...) plugin_log(LOG_ERR, __VA_ARGS__)
+#define WARNING(...) plugin_log(LOG_WARNING, __VA_ARGS__)
+#define NOTICE(...) plugin_log(LOG_NOTICE, __VA_ARGS__)
+#define INFO(...) plugin_log(LOG_INFO, __VA_ARGS__)
+#if COLLECT_DEBUG
+#define DEBUG(...) plugin_log(LOG_DEBUG, __VA_ARGS__)
+#else /* COLLECT_DEBUG */
+#define DEBUG(...) /* noop */
+#endif /* ! COLLECT_DEBUG */
+
+/* This will log messages, prefixed by plugin name */
+void daemon_log(int level, const char *format, ...)
+ __attribute__((format(printf, 2, 3)));
+
+#define P_ERROR(...) daemon_log(LOG_ERR, __VA_ARGS__)
+#define P_WARNING(...) daemon_log(LOG_WARNING, __VA_ARGS__)
+#define P_NOTICE(...) daemon_log(LOG_NOTICE, __VA_ARGS__)
+#define P_INFO(...) daemon_log(LOG_INFO, __VA_ARGS__)
+
+const data_set_t *plugin_get_ds(const char *name);
+
+int plugin_notification_meta_add_string(notification_t *n, const char *name,
+ const char *value);
+int plugin_notification_meta_add_signed_int(notification_t *n, const char *name,
+ int64_t value);
+int plugin_notification_meta_add_unsigned_int(notification_t *n,
+ const char *name, uint64_t value);
+int plugin_notification_meta_add_double(notification_t *n, const char *name,
+ double value);
+int plugin_notification_meta_add_boolean(notification_t *n, const char *name,
+ bool value);
+
+int plugin_notification_meta_copy(notification_t *dst,
+ const notification_t *src);
+
+int plugin_notification_meta_free(notification_meta_t *n);
+
+/*
+ * Plugin context management.
+ */
+
+void plugin_init_ctx(void);
+
+plugin_ctx_t plugin_get_ctx(void);
+plugin_ctx_t plugin_set_ctx(plugin_ctx_t ctx);
+
+/*
+ * NAME
+ * plugin_get_interval
+ *
+ * DESCRIPTION
+ * This function returns the current value of the plugin's interval. The
+ * return value will be strictly greater than zero in all cases. If
+ * everything else fails, it will fall back to 10 seconds.
+ */
+cdtime_t plugin_get_interval(void);
+
+/*
+ * Context-aware thread management.
+ */
+
+int plugin_thread_create(pthread_t *thread, void *(*start_routine)(void *),
+ void *arg, char const *name);
+
+/*
+ * Plugins need to implement this
+ */
+
+void module_register(void);
+
+#endif /* PLUGIN_H */