nginx/src/http/ngx_http_upstream_round_robin.c

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2006-12-05 00:46:13 +08:00
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
ngx_int_t
ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
ngx_http_upstream_srv_conf_t *us)
{
ngx_url_t u;
ngx_uint_t i, j, n;
ngx_http_upstream_server_t *server;
ngx_http_upstream_rr_peers_t *peers;
us->peer.init = ngx_http_upstream_init_round_robin_peer;
if (us->servers) {
n = 0;
server = us->servers->elts;
for (i = 0; i < us->servers->nelts; i++) {
n += server[i].naddrs;
}
peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
+ sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
if (peers == NULL) {
return NGX_ERROR;
}
peers->number = n;
peers->name = &us->host;
n = 0;
for (i = 0; i < us->servers->nelts; i++) {
for (j = 0; j < server[i].naddrs; j++) {
peers->peer[n].sockaddr = server[i].addrs[j].sockaddr;
peers->peer[n].socklen = server[i].addrs[j].socklen;
peers->peer[n].name = server[i].addrs[j].name;
peers->peer[n].weight = server[i].weight;
peers->peer[n].current_weight = server[i].weight;
peers->peer[n].max_fails = server[i].max_fails;
peers->peer[n].fail_timeout = server[i].fail_timeout;
peers->peer[n].down = server[i].down;
n++;
}
}
us->peer.data = peers;
return NGX_OK;
}
/* an upstream implicitly defined by proxy_pass, etc. */
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if (us->port == 0 && us->default_port == 0) {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"no port in upstream \"%V\" in %s:%ui",
&us->host, us->file_name.data, us->line);
return NGX_ERROR;
}
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ngx_memzero(&u, sizeof(ngx_url_t));
u.host = us->host;
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u.port = (in_port_t) (us->port ? us->port : us->default_port);
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if (ngx_inet_resolve_host(cf, &u) != NGX_OK) {
if (u.err) {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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"%s in upstream \"%V\" in %s:%ui",
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u.err, &us->host, us->file_name.data, us->line);
}
return NGX_ERROR;
}
n = u.naddrs;
peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
+ sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
if (peers == NULL) {
return NGX_ERROR;
}
peers->number = n;
peers->name = &us->host;
n = 0;
for (i = 0; i < u.naddrs; i++) {
peers->peer[n].sockaddr = u.addrs[i].sockaddr;
peers->peer[n].socklen = u.addrs[i].socklen;
peers->peer[n].name = u.addrs[i].name;
peers->peer[n].weight = 1;
peers->peer[n].current_weight = 1;
peers->peer[n].max_fails = 1;
peers->peer[n].fail_timeout = 10;
n++;
}
us->peer.data = peers;
return NGX_OK;
}
ngx_int_t
ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r,
ngx_http_upstream_srv_conf_t *us)
{
ngx_uint_t n;
ngx_http_upstream_rr_peer_data_t *rrp;
rrp = r->upstream->peer.data;
if (rrp == NULL) {
rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t));
if (rrp == NULL) {
return NGX_ERROR;
}
r->upstream->peer.data = rrp;
}
rrp->peers = us->peer.data;
rrp->current = 0;
if (rrp->peers->number <= 8 * sizeof(uintptr_t)) {
rrp->tried = &rrp->data;
rrp->data = 0;
} else {
n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1))
/ (8 * sizeof(uintptr_t));
rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t));
if (rrp->tried == NULL) {
return NGX_ERROR;
}
}
r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer;
r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer;
r->upstream->peer.tries = rrp->peers->number;
#if (NGX_HTTP_SSL)
r->upstream->peer.save_session = ngx_http_upstream_save_round_robin_peer;
#endif
return NGX_OK;
}
ngx_int_t
ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
{
ngx_http_upstream_rr_peer_data_t *rrp = data;
time_t now;
uintptr_t m;
ngx_uint_t i, n;
ngx_connection_t *c;
ngx_http_upstream_rr_peer_t *peer;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
"get rr peer, try: %ui", pc->tries);
now = ngx_time();
/* ngx_lock_mutex(rrp->peers->mutex); */
if (rrp->peers->last_cached) {
/* cached connection */
c = rrp->peers->cached[rrp->peers->last_cached];
rrp->peers->last_cached--;
/* ngx_unlock_mutex(ppr->peers->mutex); */
#if (NGX_THREADS)
c->read->lock = c->read->own_lock;
c->write->lock = c->write->own_lock;
#endif
pc->connection = c;
pc->cached = 1;
return NGX_OK;
}
pc->cached = 0;
pc->connection = NULL;
if (rrp->peers->number == 1) {
peer = &rrp->peers->peer[0];
} else {
/* there are several peers */
if (pc->tries == rrp->peers->number) {
/* it's a first try - get a current peer */
for ( ;; ) {
rrp->current = rrp->peers->current;
n = rrp->current / (8 * sizeof(uintptr_t));
m = 1 << rrp->current % (8 * sizeof(uintptr_t));
if (!(rrp->tried[n] & m)) {
peer = &rrp->peers->peer[rrp->current];
if (!peer->down) {
if (peer->max_fails == 0
|| peer->fails < peer->max_fails)
{
break;
}
if (now - peer->accessed > peer->fail_timeout) {
peer->fails = 0;
break;
}
} else {
rrp->tried[n] |= m;
}
pc->tries--;
}
rrp->peers->current++;
if (rrp->peers->current >= rrp->peers->number) {
rrp->peers->current = 0;
}
if (pc->tries) {
continue;
}
goto failed;
}
peer->current_weight--;
if (peer->current_weight == 0) {
peer->current_weight = peer->weight;
rrp->peers->current++;
if (rrp->peers->current >= rrp->peers->number) {
rrp->peers->current = 0;
}
}
} else {
for ( ;; ) {
n = rrp->current / (8 * sizeof(uintptr_t));
m = 1 << rrp->current % (8 * sizeof(uintptr_t));
if (!(rrp->tried[n] & m)) {
peer = &rrp->peers->peer[rrp->current];
if (!peer->down) {
if (peer->max_fails == 0
|| peer->fails < peer->max_fails)
{
break;
}
if (now - peer->accessed > peer->fail_timeout) {
peer->fails = 0;
break;
}
} else {
rrp->tried[n] |= m;
}
pc->tries--;
}
rrp->current++;
if (rrp->current >= rrp->peers->number) {
rrp->current = 0;
}
if (pc->tries) {
continue;
}
goto failed;
}
peer->current_weight--;
if (peer->current_weight == 0) {
peer->current_weight = peer->weight;
if (rrp->current == rrp->peers->current) {
rrp->peers->current++;
if (rrp->peers->current >= rrp->peers->number) {
rrp->peers->current = 0;
}
}
}
}
rrp->tried[n] |= m;
}
pc->sockaddr = peer->sockaddr;
pc->socklen = peer->socklen;
pc->name = &peer->name;
#if (NGX_SSL)
pc->ssl_session = peer->ssl_session;
#endif
/* ngx_unlock_mutex(rrp->peers->mutex); */
return NGX_OK;
failed:
/* all peers failed, mark them as live for quick recovery */
for (i = 0; i < rrp->peers->number; i++) {
rrp->peers->peer[i].fails = 0;
}
/* ngx_unlock_mutex(rrp->peers->mutex); */
pc->name = rrp->peers->name;
return NGX_BUSY;
}
void
ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
ngx_uint_t state)
{
ngx_http_upstream_rr_peer_data_t *rrp = data;
time_t now;
ngx_http_upstream_rr_peer_t *peer;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
"free rr peer %ui %ui", pc->tries, state);
if (state == 0 && pc->tries == 0) {
return;
}
/* TODO: NGX_PEER_KEEPALIVE */
if (rrp->peers->number == 1) {
pc->tries = 0;
return;
}
if (state & NGX_PEER_FAILED) {
now = ngx_time();
peer = &rrp->peers->peer[rrp->current];
/* ngx_lock_mutex(rrp->peers->mutex); */
peer->fails++;
peer->accessed = now;
if (peer->current_weight > 1) {
peer->current_weight /= 2;
}
/* ngx_unlock_mutex(rrp->peers->mutex); */
}
rrp->current++;
if (rrp->current >= rrp->peers->number) {
rrp->current = 0;
}
if (pc->tries) {
pc->tries--;
}
/* ngx_unlock_mutex(rrp->peers->mutex); */
}
#if (NGX_HTTP_SSL)
void
ngx_http_upstream_save_round_robin_peer(ngx_peer_connection_t *pc, void *data)
{
ngx_http_upstream_rr_peer_data_t *rrp = data;
ngx_ssl_session_t *ssl_session;
ngx_http_upstream_rr_peer_t *peer;
ssl_session = ngx_ssl_get_session(pc->connection);
if (ssl_session == NULL) {
return;
}
peer = &rrp->peers->peer[rrp->current];
/* ngx_lock_mutex(rrp->peers->mutex); */
peer->ssl_session = ssl_session;
/* ngx_unlock_mutex(rrp->peers->mutex); */
if (pc->ssl_session) {
/* TODO: may block */
ngx_ssl_free_session(pc->ssl_session);
}
}
#endif