2006-12-05 00:46:13 +08:00
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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ngx_int_t
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ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
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ngx_http_upstream_srv_conf_t *us)
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{
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ngx_url_t u;
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ngx_uint_t i, j, n;
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ngx_http_upstream_server_t *server;
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ngx_http_upstream_rr_peers_t *peers;
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us->peer.init = ngx_http_upstream_init_round_robin_peer;
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if (us->servers) {
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n = 0;
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server = us->servers->elts;
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for (i = 0; i < us->servers->nelts; i++) {
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n += server[i].naddrs;
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}
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peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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+ sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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if (peers == NULL) {
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return NGX_ERROR;
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}
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peers->number = n;
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peers->name = &us->host;
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n = 0;
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for (i = 0; i < us->servers->nelts; i++) {
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for (j = 0; j < server[i].naddrs; j++) {
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peers->peer[n].sockaddr = server[i].addrs[j].sockaddr;
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peers->peer[n].socklen = server[i].addrs[j].socklen;
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peers->peer[n].name = server[i].addrs[j].name;
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peers->peer[n].weight = server[i].weight;
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peers->peer[n].current_weight = server[i].weight;
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peers->peer[n].max_fails = server[i].max_fails;
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peers->peer[n].fail_timeout = server[i].fail_timeout;
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peers->peer[n].down = server[i].down;
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n++;
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}
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}
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us->peer.data = peers;
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return NGX_OK;
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}
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/* an upstream implicitly defined by proxy_pass, etc. */
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2006-12-13 00:46:16 +08:00
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if (us->port == 0 && us->default_port == 0) {
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ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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"no port in upstream \"%V\" in %s:%ui",
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&us->host, us->file_name.data, us->line);
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return NGX_ERROR;
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}
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2006-12-05 00:46:13 +08:00
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ngx_memzero(&u, sizeof(ngx_url_t));
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u.host = us->host;
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2006-12-13 23:06:46 +08:00
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u.port = (in_port_t) (us->port ? us->port : us->default_port);
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2006-12-05 00:46:13 +08:00
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if (ngx_inet_resolve_host(cf, &u) != NGX_OK) {
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if (u.err) {
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ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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2006-12-11 16:59:30 +08:00
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"%s in upstream \"%V\" in %s:%ui",
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2006-12-05 00:46:13 +08:00
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u.err, &us->host, us->file_name.data, us->line);
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}
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return NGX_ERROR;
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}
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n = u.naddrs;
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peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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+ sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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if (peers == NULL) {
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return NGX_ERROR;
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}
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peers->number = n;
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peers->name = &us->host;
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n = 0;
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for (i = 0; i < u.naddrs; i++) {
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peers->peer[n].sockaddr = u.addrs[i].sockaddr;
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peers->peer[n].socklen = u.addrs[i].socklen;
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peers->peer[n].name = u.addrs[i].name;
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peers->peer[n].weight = 1;
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peers->peer[n].current_weight = 1;
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peers->peer[n].max_fails = 1;
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peers->peer[n].fail_timeout = 10;
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n++;
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}
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us->peer.data = peers;
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return NGX_OK;
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}
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ngx_int_t
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ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r,
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ngx_http_upstream_srv_conf_t *us)
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{
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ngx_uint_t n;
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ngx_http_upstream_rr_peer_data_t *rrp;
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rrp = r->upstream->peer.data;
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if (rrp == NULL) {
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rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t));
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if (rrp == NULL) {
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return NGX_ERROR;
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}
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r->upstream->peer.data = rrp;
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}
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rrp->peers = us->peer.data;
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rrp->current = 0;
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if (rrp->peers->number <= 8 * sizeof(uintptr_t)) {
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rrp->tried = &rrp->data;
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rrp->data = 0;
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} else {
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n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1))
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/ (8 * sizeof(uintptr_t));
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rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t));
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if (rrp->tried == NULL) {
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return NGX_ERROR;
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}
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}
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r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer;
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r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer;
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r->upstream->peer.tries = rrp->peers->number;
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#if (NGX_HTTP_SSL)
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r->upstream->peer.save_session = ngx_http_upstream_save_round_robin_peer;
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#endif
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return NGX_OK;
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}
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ngx_int_t
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ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
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{
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ngx_http_upstream_rr_peer_data_t *rrp = data;
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time_t now;
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uintptr_t m;
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ngx_uint_t i, n;
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ngx_connection_t *c;
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ngx_http_upstream_rr_peer_t *peer;
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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"get rr peer, try: %ui", pc->tries);
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now = ngx_time();
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/* ngx_lock_mutex(rrp->peers->mutex); */
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if (rrp->peers->last_cached) {
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/* cached connection */
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c = rrp->peers->cached[rrp->peers->last_cached];
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rrp->peers->last_cached--;
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/* ngx_unlock_mutex(ppr->peers->mutex); */
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#if (NGX_THREADS)
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c->read->lock = c->read->own_lock;
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c->write->lock = c->write->own_lock;
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#endif
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pc->connection = c;
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pc->cached = 1;
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return NGX_OK;
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}
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pc->cached = 0;
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pc->connection = NULL;
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if (rrp->peers->number == 1) {
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peer = &rrp->peers->peer[0];
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} else {
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/* there are several peers */
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if (pc->tries == rrp->peers->number) {
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/* it's a first try - get a current peer */
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for ( ;; ) {
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rrp->current = rrp->peers->current;
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n = rrp->current / (8 * sizeof(uintptr_t));
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m = 1 << rrp->current % (8 * sizeof(uintptr_t));
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if (!(rrp->tried[n] & m)) {
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peer = &rrp->peers->peer[rrp->current];
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if (!peer->down) {
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if (peer->max_fails == 0
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|| peer->fails < peer->max_fails)
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{
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break;
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}
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if (now - peer->accessed > peer->fail_timeout) {
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peer->fails = 0;
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break;
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}
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} else {
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rrp->tried[n] |= m;
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}
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pc->tries--;
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}
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rrp->peers->current++;
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if (rrp->peers->current >= rrp->peers->number) {
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rrp->peers->current = 0;
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}
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if (pc->tries) {
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continue;
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}
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goto failed;
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}
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peer->current_weight--;
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if (peer->current_weight == 0) {
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peer->current_weight = peer->weight;
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rrp->peers->current++;
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if (rrp->peers->current >= rrp->peers->number) {
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rrp->peers->current = 0;
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}
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}
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} else {
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for ( ;; ) {
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n = rrp->current / (8 * sizeof(uintptr_t));
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m = 1 << rrp->current % (8 * sizeof(uintptr_t));
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if (!(rrp->tried[n] & m)) {
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peer = &rrp->peers->peer[rrp->current];
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if (!peer->down) {
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if (peer->max_fails == 0
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|| peer->fails < peer->max_fails)
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{
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break;
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}
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if (now - peer->accessed > peer->fail_timeout) {
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peer->fails = 0;
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break;
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}
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} else {
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rrp->tried[n] |= m;
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}
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pc->tries--;
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}
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rrp->current++;
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if (rrp->current >= rrp->peers->number) {
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rrp->current = 0;
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}
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if (pc->tries) {
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continue;
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}
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goto failed;
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}
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peer->current_weight--;
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if (peer->current_weight == 0) {
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peer->current_weight = peer->weight;
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if (rrp->current == rrp->peers->current) {
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rrp->peers->current++;
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if (rrp->peers->current >= rrp->peers->number) {
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rrp->peers->current = 0;
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}
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}
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}
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}
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rrp->tried[n] |= m;
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}
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pc->sockaddr = peer->sockaddr;
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pc->socklen = peer->socklen;
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pc->name = &peer->name;
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#if (NGX_SSL)
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pc->ssl_session = peer->ssl_session;
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#endif
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/* ngx_unlock_mutex(rrp->peers->mutex); */
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return NGX_OK;
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failed:
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/* all peers failed, mark them as live for quick recovery */
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for (i = 0; i < rrp->peers->number; i++) {
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rrp->peers->peer[i].fails = 0;
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}
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/* ngx_unlock_mutex(rrp->peers->mutex); */
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pc->name = rrp->peers->name;
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return NGX_BUSY;
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}
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void
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ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
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ngx_uint_t state)
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{
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ngx_http_upstream_rr_peer_data_t *rrp = data;
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time_t now;
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ngx_http_upstream_rr_peer_t *peer;
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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"free rr peer %ui %ui", pc->tries, state);
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if (state == 0 && pc->tries == 0) {
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return;
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}
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/* TODO: NGX_PEER_KEEPALIVE */
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if (rrp->peers->number == 1) {
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pc->tries = 0;
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return;
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}
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if (state & NGX_PEER_FAILED) {
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now = ngx_time();
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peer = &rrp->peers->peer[rrp->current];
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/* ngx_lock_mutex(rrp->peers->mutex); */
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peer->fails++;
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peer->accessed = now;
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if (peer->current_weight > 1) {
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peer->current_weight /= 2;
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}
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/* ngx_unlock_mutex(rrp->peers->mutex); */
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}
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|
|
|
|
|
|
|
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
|