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index 578fb51e7087e72b634cb60f4b44cc32738a5b9d..d5a76941c06255085215a77215c2cd17b0b89f3c 100644 (file)
--- a/src/include/core/store.h
+++ b/src/include/core/store.h
#include "core/object.h"
#include "core/data.h"
#include "core/time.h"
+#include "core/timeseries.h"
#include "utils/strbuf.h"
#include <stdio.h>
enum {
SDB_HOST = 1,
SDB_SERVICE,
+ SDB_METRIC,
SDB_ATTRIBUTE,
};
#define SDB_STORE_TYPE_TO_NAME(t) \
(((t) == SDB_HOST) ? "host" \
: ((t) == SDB_SERVICE) ? "service" \
+ : ((t) == SDB_METRIC) ? "metric" \
: ((t) == SDB_ATTRIBUTE) ? "attribute" : "unknown")
-
/*
* sdb_store_obj_t represents the super-class of any object stored in the
* database. It inherits from sdb_object_t and may safely be cast to a generic
struct sdb_store_obj;
typedef struct sdb_store_obj sdb_store_obj_t;
+/*
+ * Queryable fields of a stored object.
+ */
+enum {
+ SDB_FIELD_LAST_UPDATE = 1, /* datetime */
+ SDB_FIELD_AGE, /* datetime */
+ SDB_FIELD_INTERVAL, /* datetime */
+ SDB_FIELD_BACKEND, /* string */
+};
+
+#define SDB_FIELD_TO_NAME(f) \
+ (((f) == SDB_FIELD_LAST_UPDATE) ? "last-update" \
+ : ((f) == SDB_FIELD_AGE) ? "age" \
+ : ((f) == SDB_FIELD_INTERVAL) ? "interval" \
+ : ((f) == SDB_FIELD_BACKEND) ? "backend" : "unknown")
+
/*
* sdb_store_clear:
* Clear the entire store and remove all stored objects.
* specified 'service' object. If the referenced host does not exist, an error
* will be reported. Else, a new entry will be created in the store. Any
* memory required for storing the entry will be allocated an managed by the
- * store itself. The specified service-object will not be referenced or
- * further accessed.
+ * store itself.
*
* Returns:
* - 0 on success
sdb_store_service_attr(const char *hostname, const char *service,
const char *key, const sdb_data_t *value, sdb_time_t last_update);
+/*
+ * A metric store describes how to access a metric's data.
+ */
+typedef struct {
+ const char *type;
+ const char *id;
+} sdb_metric_store_t;
+
+/*
+ * sdb_store_metric:
+ * Add/update a metric in the store. If the metric, identified by its name,
+ * already exists for the specified host, it will be updated according to the
+ * specified 'metric' object. If the referenced host does not exist, an error
+ * will be reported. Else, a new entry will be created in the store. Any
+ * memory required for storing the entry will be allocated an managed by the
+ * store itself.
+ *
+ * If specified, the metric store describes where to access the metric's data.
+ *
+ * Returns:
+ * - 0 on success
+ * - a positive value if the new entry is older than the currently stored
+ * entry (in this case, no update will happen)
+ * - a negative value on error
+ */
+int
+sdb_store_metric(const char *hostname, const char *name,
+ sdb_metric_store_t *store, sdb_time_t last_update);
+
+/*
+ * sdb_store_metric_attr:
+ * Add/update a metric's attribute in the store. If the attribute, identified
+ * by its key, already exists for the specified metric, it will be updated to
+ * the specified value. If the references metric (for the specified host)
+ * does not exist, an error will be reported. Any memory required for storing
+ * the entry will be allocated and managed by the store itself.
+ *
+ * Returns:
+ * - 0 on success
+ * - a positive value if the new entry is older than the currently stored
+ * entry (in this case, no update will happen)
+ * - a negative value on error
+ */
+int
+sdb_store_metric_attr(const char *hostname, const char *metric,
+ const char *key, const sdb_data_t *value, sdb_time_t last_update);
+
+/*
+ * sdb_store_fetch_timeseries:
+ * Fetch the time-series described by the specified host's metric and
+ * serialize it as JSON into the provided string buffer.
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
+ */
+int
+sdb_store_fetch_timeseries(const char *hostname, const char *metric,
+ sdb_timeseries_opts_t *opts, sdb_strbuf_t *buf);
+
+/*
+ * sdb_store_get_field:
+ * Get the value of a stored object's queryable field. The caller is
+ * responsible for freeing any dynamically allocated memory possibly stored in
+ * the returned value.
+ *
+ * Note: Retrieving the backend this way is not currently supported.
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
+ */
+int
+sdb_store_get_field(sdb_store_obj_t *obj, int field, sdb_data_t *res);
+
/*
* Expressions specify arithmetic expressions.
*
sdb_store_expr_t *
sdb_store_expr_create(int op, sdb_store_expr_t *left, sdb_store_expr_t *right);
+/*
+ * sdb_store_expr_fieldvalue:
+ * Creates an expression which evaluates to the value of the specified
+ * queryable field of a stored object.
+ *
+ * Returns:
+ * - an expression object on success
+ * - NULL else
+ */
+sdb_store_expr_t *
+sdb_store_expr_fieldvalue(int field);
+
/*
* sdb_store_expr_constvalue:
* Creates an expression which evaluates to the specified constant value.
/*
* sdb_store_expr_eval:
- * Evaluate an expression and stores the result in 'res'. The result's value
- * will be allocated dynamically if necessary and, thus, should be free'd by
- * the caller (e.g. using sdb_data_free_datum);
+ * Evaluate an expression for the specified stored object and stores the
+ * result in 'res'. The result's value will be allocated dynamically if
+ * necessary and, thus, should be free'd by the caller (e.g. using
+ * sdb_data_free_datum). The object may be NULL, in which case the expression
+ * needs to evaluate to a constant value.
*
* Returns:
* - 0 on success
* - a negative value else
*/
int
-sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_data_t *res);
+sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_store_obj_t *obj,
+ sdb_data_t *res);
/*
* Conditionals may be used to lookup hosts from the store based on a
sdb_store_cond_t *
sdb_store_attr_cond(const char *name, sdb_store_expr_t *expr);
+/*
+ * sdb_store_obj_cond:
+ * Creates a conditional based on queryable object fields. The respective
+ * field of *any* object type is compared against the value the expression
+ * evaluates to.
+ */
+sdb_store_cond_t *
+sdb_store_obj_cond(int field, sdb_store_expr_t *expr);
+
/*
* Store matchers may be used to lookup hosts from the store based on their
* various attributes. Service and attribute matchers are applied to a host's
sdb_store_matcher_t *
sdb_store_gt_matcher(sdb_store_cond_t *cond);
+/*
+ * sdb_store_parse_object_type_plural:
+ * Parse the type name (plural) of a stored object.
+ *
+ * Returns:
+ * - the object type on success
+ * - a negative value else
+ */
+int
+sdb_store_parse_object_type_plural(const char *name);
+
+/*
+ * sdb_store_parse_field_name:
+ * Parse the name of a stored object's queryable field.
+ *
+ * Returns:
+ * - the field id on success
+ * - a negative value else
+ */
+int
+sdb_store_parse_field_name(const char *name);
+
/*
* sdb_store_matcher_parse_cmp:
* Parse a simple compare expression (<obj_type>.<attr> <op> <expression>).
sdb_store_matcher_parse_cmp(const char *obj_type, const char *attr,
const char *op, sdb_store_expr_t *expr);
+/*
+ * sdb_store_matcher_parse_field_cmp:
+ * Parse a simple compare expression for queryable object fields (<field> <op>
+ * <expression>).
+ *
+ * Returns:
+ * - a matcher object on success
+ * - NULL else
+ */
+sdb_store_matcher_t *
+sdb_store_matcher_parse_field_cmp(const char *name, const char *op,
+ sdb_store_expr_t *expr);
+
/*
* sdb_store_dis_matcher:
* Creates a matcher matching the disjunction (logical OR) of two matchers.
* of the matcher. Only those objects matching the filter will be considered.
*
* Note that the filter is applied to all object types (hosts, service,
- * attribute). Thus, any object-specific matchers are mostly unsuited for this
- * purpose and, if used, may result in unexpected behavior.
+ * metric, attribute). Thus, any object-specific matchers are mostly unsuited
+ * for this purpose and, if used, may result in unexpected behavior.
*
* Returns:
* - 1 if the object matches
/*
* Flags for serialization functions.
*
- * By default, the full object will be included in the serialized output. When
- * specifying any of the flags, the respective information will be left out.
+ * By default, the full host object will be included in the serialized output.
+ * When specifying any of the flags, the respective information will be left
+ * out. The SKIP_EMPTY flags may be used to skip host objects entirely.
*/
enum {
SDB_SKIP_ATTRIBUTES = 1 << 0,
SDB_SKIP_SERVICES = 1 << 1,
- SDB_SKIP_SERVICE_ATTRIBUTES = 1 << 2,
+ SDB_SKIP_METRICS = 1 << 2,
+ SDB_SKIP_SERVICE_ATTRIBUTES = 1 << 3,
+
+ SDB_SKIP_ALL = (1 << 8) - 1,
- SDB_SKIP_ALL = 0xffff,
+ /* skip hosts if they do not reference any services/metrics */
+ SDB_SKIP_EMPTY_SERVICES = 1 << 8,
+ SDB_SKIP_EMPTY_METRICS = 1 << 9,
};
/*
* sdb_store_tojson:
* Serialize the entire store to JSON and append the result to the specified
- * buffer.
+ * buffer. If specified, only objects matching the filter will be included in
+ * the result (see sdb_store_host_tojson for details).
*
* Returns:
* - 0 on success
* - a negative value on error
*/
int
-sdb_store_tojson(sdb_strbuf_t *buf, int flags);
+sdb_store_tojson(sdb_strbuf_t *buf, sdb_store_matcher_t *filter, int flags);
/*
* sdb_store_host_tojson:
* Serialize a host object to JSON and append the result to the specified
- * buffer.
+ * buffer. If specified, only objects matching the filter will be included in
+ * the result. The filter is applied to each object individually and, thus,
+ * should not be of any object-type specific kind. The filter is never applied
+ * to the specified host object; the caller is responsible for this and for
+ * correctly handling skipped hosts.
*
* Returns:
* - 0 on success
* - a negative value on error
*/
int
-sdb_store_host_tojson(sdb_store_obj_t *host, sdb_strbuf_t *buf, int flags);
+sdb_store_host_tojson(sdb_store_obj_t *host, sdb_strbuf_t *buf,
+ sdb_store_matcher_t *filter, int flags);
/*
* sdb_store_iter_cb: