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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#ifndef _NGX_STREAM_UPSTREAM_ROUND_ROBIN_H_INCLUDED_
#define _NGX_STREAM_UPSTREAM_ROUND_ROBIN_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_stream.h>
typedef struct ngx_stream_upstream_rr_peers_s ngx_stream_upstream_rr_peers_t;
typedef struct ngx_stream_upstream_rr_peer_s ngx_stream_upstream_rr_peer_t;
#if (NGX_STREAM_UPSTREAM_ZONE)
typedef struct {
ngx_event_t event; /* must be first */
ngx_uint_t worker;
ngx_str_t name;
ngx_str_t service;
time_t valid;
ngx_stream_upstream_rr_peers_t *peers;
ngx_stream_upstream_rr_peer_t *peer;
} ngx_stream_upstream_host_t;
#endif
struct ngx_stream_upstream_rr_peer_s {
struct sockaddr *sockaddr;
socklen_t socklen;
ngx_str_t name;
ngx_str_t server;
ngx_int_t current_weight;
ngx_int_t effective_weight;
ngx_int_t weight;
ngx_uint_t conns;
ngx_uint_t max_conns;
ngx_uint_t fails;
time_t accessed;
time_t checked;
ngx_uint_t max_fails;
time_t fail_timeout;
ngx_msec_t slow_start;
ngx_msec_t start_time;
ngx_uint_t down;
void *ssl_session;
int ssl_session_len;
#if (NGX_STREAM_UPSTREAM_ZONE)
unsigned zombie:1;
ngx_atomic_t lock;
ngx_uint_t refs;
ngx_stream_upstream_host_t *host;
#endif
ngx_stream_upstream_rr_peer_t *next;
NGX_COMPAT_BEGIN(14)
NGX_COMPAT_END
};
struct ngx_stream_upstream_rr_peers_s {
ngx_uint_t number;
#if (NGX_STREAM_UPSTREAM_ZONE)
ngx_slab_pool_t *shpool;
ngx_atomic_t rwlock;
ngx_uint_t *config;
ngx_stream_upstream_rr_peer_t *resolve;
ngx_stream_upstream_rr_peers_t *zone_next;
#endif
ngx_uint_t total_weight;
ngx_uint_t tries;
unsigned single:1;
unsigned weighted:1;
ngx_str_t *name;
ngx_stream_upstream_rr_peers_t *next;
ngx_stream_upstream_rr_peer_t *peer;
};
#if (NGX_STREAM_UPSTREAM_ZONE)
#define ngx_stream_upstream_rr_peers_rlock(peers) \
\
if (peers->shpool) { \
ngx_rwlock_rlock(&peers->rwlock); \
}
#define ngx_stream_upstream_rr_peers_wlock(peers) \
\
if (peers->shpool) { \
ngx_rwlock_wlock(&peers->rwlock); \
}
#define ngx_stream_upstream_rr_peers_unlock(peers) \
\
if (peers->shpool) { \
ngx_rwlock_unlock(&peers->rwlock); \
}
#define ngx_stream_upstream_rr_peer_lock(peers, peer) \
\
if (peers->shpool) { \
ngx_rwlock_wlock(&peer->lock); \
}
#define ngx_stream_upstream_rr_peer_unlock(peers, peer) \
\
if (peers->shpool) { \
ngx_rwlock_unlock(&peer->lock); \
}
#define ngx_stream_upstream_rr_peer_ref(peers, peer) \
(peer)->refs++;
static ngx_inline void
ngx_stream_upstream_rr_peer_free_locked(ngx_stream_upstream_rr_peers_t *peers,
ngx_stream_upstream_rr_peer_t *peer)
{
if (peer->refs) {
peer->zombie = 1;
return;
}
ngx_slab_free_locked(peers->shpool, peer->sockaddr);
ngx_slab_free_locked(peers->shpool, peer->name.data);
if (peer->server.data) {
ngx_slab_free_locked(peers->shpool, peer->server.data);
}
#if (NGX_STREAM_SSL)
if (peer->ssl_session) {
ngx_slab_free_locked(peers->shpool, peer->ssl_session);
}
#endif
ngx_slab_free_locked(peers->shpool, peer);
}
static ngx_inline void
ngx_stream_upstream_rr_peer_free(ngx_stream_upstream_rr_peers_t *peers,
ngx_stream_upstream_rr_peer_t *peer)
{
ngx_shmtx_lock(&peers->shpool->mutex);
ngx_stream_upstream_rr_peer_free_locked(peers, peer);
ngx_shmtx_unlock(&peers->shpool->mutex);
}
static ngx_inline ngx_int_t
ngx_stream_upstream_rr_peer_unref(ngx_stream_upstream_rr_peers_t *peers,
ngx_stream_upstream_rr_peer_t *peer)
{
peer->refs--;
if (peers->shpool == NULL) {
return NGX_OK;
}
if (peer->refs == 0 && peer->zombie) {
ngx_stream_upstream_rr_peer_free(peers, peer);
return NGX_DONE;
}
return NGX_OK;
}
#else
#define ngx_stream_upstream_rr_peers_rlock(peers)
#define ngx_stream_upstream_rr_peers_wlock(peers)
#define ngx_stream_upstream_rr_peers_unlock(peers)
#define ngx_stream_upstream_rr_peer_lock(peers, peer)
#define ngx_stream_upstream_rr_peer_unlock(peers, peer)
#define ngx_stream_upstream_rr_peer_ref(peers, peer)
#define ngx_stream_upstream_rr_peer_unref(peers, peer) NGX_OK
#endif
typedef struct {
ngx_uint_t config;
ngx_stream_upstream_rr_peers_t *peers;
ngx_stream_upstream_rr_peer_t *current;
uintptr_t *tried;
uintptr_t data;
} ngx_stream_upstream_rr_peer_data_t;
ngx_int_t ngx_stream_upstream_init_round_robin(ngx_conf_t *cf,
ngx_stream_upstream_srv_conf_t *us);
ngx_int_t ngx_stream_upstream_init_round_robin_peer(ngx_stream_session_t *s,
ngx_stream_upstream_srv_conf_t *us);
ngx_int_t ngx_stream_upstream_create_round_robin_peer(ngx_stream_session_t *s,
ngx_stream_upstream_resolved_t *ur);
ngx_int_t ngx_stream_upstream_get_round_robin_peer(ngx_peer_connection_t *pc,
void *data);
void ngx_stream_upstream_free_round_robin_peer(ngx_peer_connection_t *pc,
void *data, ngx_uint_t state);
#endif /* _NGX_STREAM_UPSTREAM_ROUND_ROBIN_H_INCLUDED_ */
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