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#ifndef UPSTREAM_H
#define UPSTREAM_H
#include <sys/types.h>
#include <stdint.h>
/*
* Structure of generic upstream
*/
struct upstream {
guint errors; /**< Errors for this upstream */
time_t time; /**< Time of marking */
guint dead; /**< Dead flag */
guint priority; /**< Fixed priority */
gint16 weight; /**< Dynamic weight */
guint32 *ketama_points; /**< Ketama points array */
size_t ketama_points_size; /**< Ketama array size */
};
/*
* Upstream error logic
* 1. During error time we count upstream_ok and upstream_fail
* 2. If failcount is more then maxerrors then we mark upstream as unavailable for dead time
* 3. After dead time we mark upstream as alive and go to the step 1
* 4. If all upstreams are dead, marks every upstream as alive
*/
/*
* Add an error to an upstream
*/
void upstream_fail (struct upstream *up, time_t now);
/*
* Increase upstream successes count
*/
void upstream_ok (struct upstream *up, time_t now);
/*
* Make all upstreams alive
*/
void revive_all_upstreams (void *ups, size_t members, size_t msize);
/*
* Add ketama points for upstream
*/
gint upstream_ketama_add (struct upstream *up, gchar *up_key, size_t keylen, size_t keypoints);
/*
* Get a random upstream from array of upstreams
* @param ups array of structures that contains struct upstream as their first element
* @param members number of elements in array
* @param msize size of each member
* @param now current time
* @param error_timeout time during which we are counting errors
* @param revive_timeout time during which we counts upstream dead
* @param max_errors maximum errors during error_timeout to mark upstream dead
*/
struct upstream* get_random_upstream (void *ups, size_t members, size_t msize,
time_t now, time_t error_timeout,
time_t revive_timeout, size_t max_errors);
/*
* Get upstream based on hash from array of upstreams
* @param ups array of structures that contains struct upstream as their first element
* @param members number of elements in array
* @param msize size of each member
* @param now current time
* @param error_timeout time during which we are counting errors
* @param revive_timeout time during which we counts upstream dead
* @param max_errors maximum errors during error_timeout to mark upstream dead
* @param key key for hashing
* @param keylen length of the key
*/
struct upstream* get_upstream_by_hash (void *ups, size_t members, size_t msize,
time_t now, time_t error_timeout,
time_t revive_timeout, size_t max_errors,
gchar *key, size_t keylen);
/*
* Get an upstream from array of upstreams based on its current weight
* @param ups array of structures that contains struct upstream as their first element
* @param members number of elements in array
* @param msize size of each member
* @param now current time
* @param error_timeout time during which we are counting errors
* @param revive_timeout time during which we counts upstream dead
* @param max_errors maximum errors during error_timeout to mark upstream dead
*/
struct upstream* get_upstream_round_robin (void *ups, size_t members, size_t msize,
time_t now, time_t error_timeout,
time_t revive_timeout, size_t max_errors);
/*
* Get upstream based on hash from array of upstreams, this functions is using ketama algorithm
* @param ups array of structures that contains struct upstream as their first element
* @param members number of elements in array
* @param msize size of each member
* @param now current time
* @param error_timeout time during which we are counting errors
* @param revive_timeout time during which we counts upstream dead
* @param max_errors maximum errors during error_timeout to mark upstream dead
* @param key key for hashing
* @param keylen length of the key
*/
struct upstream* get_upstream_by_hash_ketama (void *ups, size_t members, size_t msize, time_t now,
time_t error_timeout, time_t revive_timeout, size_t max_errors,
gchar *key, size_t keylen);
/*
* Get an upstream from array of upstreams based on its current priority (not weight)
* @param ups array of structures that contains struct upstream as their first element
* @param members number of elements in array
* @param msize size of each member
* @param now current time
* @param error_timeout time during which we are counting errors
* @param revive_timeout time during which we counts upstream dead
* @param max_errors maximum errors during error_timeout to mark upstream dead
*/
struct upstream* get_upstream_master_slave (void *ups, size_t members, size_t msize,
time_t now, time_t error_timeout,
time_t revive_timeout, size_t max_errors);
#endif /* UPSTREAM_H */
/*
* vi:ts=4
*/
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