X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Finclude%2Fcore%2Fstore.h;h=533f4080ec17f049051f19a04b97111d226cfc33;hb=6fbccd38ba921b0f08b4a38ef3568bd9ca12fcd5;hp=4e8d468c4263f0e57cd2f26d301aedf0006102a7;hpb=812d8a3d3bb4d41ac66294ee1652708b19502eb2;p=sysdb.git diff --git a/src/include/core/store.h b/src/include/core/store.h index 4e8d468..533f408 100644 --- a/src/include/core/store.h +++ b/src/include/core/store.h @@ -53,7 +53,6 @@ enum { : ((t) == SDB_SERVICE) ? "service" \ : ((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 @@ -62,6 +61,22 @@ enum { 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. @@ -158,6 +173,67 @@ int sdb_store_service_attr(const char *hostname, const char *service, const char *key, const sdb_data_t *value, sdb_time_t last_update); +/* + * 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. + * + * A expression object inherits from sdb_object_t and, thus, may safely be + * cast to a generic object. + */ +struct sdb_store_expr; +typedef struct sdb_store_expr sdb_store_expr_t; +#define SDB_STORE_EXPR(obj) ((sdb_store_expr_t *)(obj)) + +/* + * sdb_store_expr_create: + * Creates an arithmetic expression implementing the specified operator on the + * specified left and right operand. + * + * Returns: + * - an expression object on success + * - NULL else + */ +sdb_store_expr_t * +sdb_store_expr_create(int op, sdb_store_expr_t *left, sdb_store_expr_t *right); + +/* + * sdb_store_expr_constvalue: + * Creates an expression which evaluates to the specified constant value. + * + * Returns: + * - an expression object on success + * - NULL else + */ +sdb_store_expr_t * +sdb_store_expr_constvalue(const sdb_data_t *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); + * + * Returns: + * - 0 on success + * - a negative value else + */ +int +sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_data_t *res); + /* * Conditionals may be used to lookup hosts from the store based on a * conditional expression. @@ -172,11 +248,20 @@ typedef struct sdb_store_cond sdb_store_cond_t; /* * sdb_store_attr_cond: * Creates a conditional based on attribute values. The value of stored - * attributes is compared against the specified value. See sdb_data_cmp for - * details about the comparison. + * attributes is compared against the value the expression evaluates to. See + * sdb_data_cmp for details about the comparison. */ sdb_store_cond_t * -sdb_store_attr_cond(const char *name, const sdb_data_t *value); +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 @@ -237,7 +322,7 @@ sdb_store_gt_matcher(sdb_store_cond_t *cond); /* * sdb_store_matcher_parse_cmp: - * Parse a simple compare expression (. ). + * Parse a simple compare expression (. ). * * Returns: * - a matcher object on success @@ -245,7 +330,20 @@ sdb_store_gt_matcher(sdb_store_cond_t *cond); */ sdb_store_matcher_t * sdb_store_matcher_parse_cmp(const char *obj_type, const char *attr, - const char *op, const sdb_data_t *value); + const char *op, sdb_store_expr_t *expr); + +/* + * sdb_store_matcher_parse_field_cmp: + * Parse a simple compare expression for queryable object fields ( + * ). + * + * 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: @@ -270,14 +368,22 @@ sdb_store_inv_matcher(sdb_store_matcher_t *m); /* * sdb_store_matcher_matches: - * Check whether the specified matcher matches the specified store object. + * Check whether the specified matcher matches the specified store object. If + * specified, the filter will be used to preselect objects for further + * evaluation. It is applied to any object that's used during the evaluation + * 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. * * Returns: * - 1 if the object matches * - 0 else */ int -sdb_store_matcher_matches(sdb_store_matcher_t *m, sdb_store_obj_t *obj); +sdb_store_matcher_matches(sdb_store_matcher_t *m, sdb_store_obj_t *obj, + sdb_store_matcher_t *filter); /* * sdb_store_matcher_tostring: @@ -298,15 +404,17 @@ typedef int (*sdb_store_lookup_cb)(sdb_store_obj_t *obj, void *user_data); * sdb_store_scan: * Look up objects in the store. The specified callback function is called for * each object in the store matching 'm'. The function performs a full scan of - * all hosts stored in the database. + * all hosts stored in the database. If specified, the filter will be used to + * preselect objects for further evaluation. See the description of + * 'sdb_store_matcher_matches' for details. * * Returns: * - 0 on success * - a negative value else */ int -sdb_store_scan(sdb_store_matcher_t *m, sdb_store_lookup_cb cb, - void *user_data); +sdb_store_scan(sdb_store_matcher_t *m, sdb_store_matcher_t *filter, + sdb_store_lookup_cb cb, void *user_data); /* * Flags for serialization functions. @@ -325,26 +433,32 @@ enum { /* * 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: