503 lines
12 KiB
C
503 lines
12 KiB
C
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/*
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* Copyright (C) Nginx, Inc.
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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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typedef struct {
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ngx_http_upstream_rr_peer_t *peer;
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ngx_uint_t range;
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} ngx_http_upstream_random_range_t;
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typedef struct {
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ngx_uint_t two;
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ngx_http_upstream_random_range_t *ranges;
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} ngx_http_upstream_random_srv_conf_t;
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typedef struct {
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/* the round robin data must be first */
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ngx_http_upstream_rr_peer_data_t rrp;
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ngx_http_upstream_random_srv_conf_t *conf;
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u_char tries;
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} ngx_http_upstream_random_peer_data_t;
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static ngx_int_t ngx_http_upstream_init_random(ngx_conf_t *cf,
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ngx_http_upstream_srv_conf_t *us);
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static ngx_int_t ngx_http_upstream_update_random(ngx_pool_t *pool,
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ngx_http_upstream_srv_conf_t *us);
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static ngx_int_t ngx_http_upstream_init_random_peer(ngx_http_request_t *r,
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ngx_http_upstream_srv_conf_t *us);
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static ngx_int_t ngx_http_upstream_get_random_peer(ngx_peer_connection_t *pc,
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void *data);
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static ngx_int_t ngx_http_upstream_get_random2_peer(ngx_peer_connection_t *pc,
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void *data);
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static ngx_uint_t ngx_http_upstream_peek_random_peer(
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ngx_http_upstream_rr_peers_t *peers,
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ngx_http_upstream_random_peer_data_t *rp);
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static void *ngx_http_upstream_random_create_conf(ngx_conf_t *cf);
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static char *ngx_http_upstream_random(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static ngx_command_t ngx_http_upstream_random_commands[] = {
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{ ngx_string("random"),
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NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS|NGX_CONF_TAKE12,
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ngx_http_upstream_random,
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NGX_HTTP_SRV_CONF_OFFSET,
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0,
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NULL },
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_upstream_random_module_ctx = {
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NULL, /* preconfiguration */
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NULL, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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ngx_http_upstream_random_create_conf, /* create server configuration */
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NULL, /* merge server configuration */
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NULL, /* create location configuration */
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NULL /* merge location configuration */
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};
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ngx_module_t ngx_http_upstream_random_module = {
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NGX_MODULE_V1,
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&ngx_http_upstream_random_module_ctx, /* module context */
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ngx_http_upstream_random_commands, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_int_t
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ngx_http_upstream_init_random(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
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{
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ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0, "init random");
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if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
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return NGX_ERROR;
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}
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us->peer.init = ngx_http_upstream_init_random_peer;
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#if (NGX_HTTP_UPSTREAM_ZONE)
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if (us->shm_zone) {
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return NGX_OK;
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}
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#endif
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return ngx_http_upstream_update_random(cf->pool, us);
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}
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static ngx_int_t
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ngx_http_upstream_update_random(ngx_pool_t *pool,
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ngx_http_upstream_srv_conf_t *us)
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{
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size_t size;
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ngx_uint_t i, total_weight;
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ngx_http_upstream_rr_peer_t *peer;
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ngx_http_upstream_rr_peers_t *peers;
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ngx_http_upstream_random_range_t *ranges;
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ngx_http_upstream_random_srv_conf_t *rcf;
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rcf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_random_module);
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peers = us->peer.data;
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size = peers->number * sizeof(ngx_http_upstream_random_range_t);
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ranges = pool ? ngx_palloc(pool, size) : ngx_alloc(size, ngx_cycle->log);
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if (ranges == NULL) {
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return NGX_ERROR;
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}
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total_weight = 0;
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for (peer = peers->peer, i = 0; peer; peer = peer->next, i++) {
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ranges[i].peer = peer;
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ranges[i].range = total_weight;
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total_weight += peer->weight;
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}
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rcf->ranges = ranges;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_upstream_init_random_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_http_upstream_random_srv_conf_t *rcf;
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ngx_http_upstream_random_peer_data_t *rp;
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ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"init random peer");
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rcf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_random_module);
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rp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_random_peer_data_t));
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if (rp == NULL) {
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return NGX_ERROR;
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}
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r->upstream->peer.data = &rp->rrp;
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if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
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return NGX_ERROR;
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}
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if (rcf->two) {
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r->upstream->peer.get = ngx_http_upstream_get_random2_peer;
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} else {
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r->upstream->peer.get = ngx_http_upstream_get_random_peer;
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}
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rp->conf = rcf;
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rp->tries = 0;
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ngx_http_upstream_rr_peers_rlock(rp->rrp.peers);
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#if (NGX_HTTP_UPSTREAM_ZONE)
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if (rp->rrp.peers->shpool && rcf->ranges == NULL) {
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if (ngx_http_upstream_update_random(NULL, us) != NGX_OK) {
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ngx_http_upstream_rr_peers_unlock(rp->rrp.peers);
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return NGX_ERROR;
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}
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}
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#endif
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ngx_http_upstream_rr_peers_unlock(rp->rrp.peers);
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_upstream_get_random_peer(ngx_peer_connection_t *pc, void *data)
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{
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ngx_http_upstream_random_peer_data_t *rp = 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_http_upstream_rr_peer_t *peer;
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ngx_http_upstream_rr_peers_t *peers;
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ngx_http_upstream_rr_peer_data_t *rrp;
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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"get random peer, try: %ui", pc->tries);
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rrp = &rp->rrp;
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peers = rrp->peers;
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ngx_http_upstream_rr_peers_rlock(peers);
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if (rp->tries > 20 || peers->single) {
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ngx_http_upstream_rr_peers_unlock(peers);
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return ngx_http_upstream_get_round_robin_peer(pc, rrp);
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}
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pc->cached = 0;
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pc->connection = NULL;
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now = ngx_time();
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for ( ;; ) {
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i = ngx_http_upstream_peek_random_peer(peers, rp);
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peer = rp->conf->ranges[i].peer;
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n = i / (8 * sizeof(uintptr_t));
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m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
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if (rrp->tried[n] & m) {
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goto next;
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}
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ngx_http_upstream_rr_peer_lock(peers, peer);
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if (peer->down) {
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ngx_http_upstream_rr_peer_unlock(peers, peer);
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goto next;
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}
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if (peer->max_fails
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&& peer->fails >= peer->max_fails
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&& now - peer->checked <= peer->fail_timeout)
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{
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ngx_http_upstream_rr_peer_unlock(peers, peer);
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goto next;
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}
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if (peer->max_conns && peer->conns >= peer->max_conns) {
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ngx_http_upstream_rr_peer_unlock(peers, peer);
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goto next;
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}
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break;
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next:
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if (++rp->tries > 20) {
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ngx_http_upstream_rr_peers_unlock(peers);
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return ngx_http_upstream_get_round_robin_peer(pc, rrp);
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}
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}
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rrp->current = peer;
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if (now - peer->checked > peer->fail_timeout) {
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peer->checked = now;
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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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peer->conns++;
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ngx_http_upstream_rr_peer_unlock(peers, peer);
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ngx_http_upstream_rr_peers_unlock(peers);
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rrp->tried[n] |= m;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_http_upstream_get_random2_peer(ngx_peer_connection_t *pc, void *data)
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{
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ngx_http_upstream_random_peer_data_t *rp = data;
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time_t now;
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uintptr_t m;
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ngx_uint_t i, n, p;
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ngx_http_upstream_rr_peer_t *peer, *prev;
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ngx_http_upstream_rr_peers_t *peers;
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ngx_http_upstream_rr_peer_data_t *rrp;
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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"get random2 peer, try: %ui", pc->tries);
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rrp = &rp->rrp;
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peers = rrp->peers;
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ngx_http_upstream_rr_peers_wlock(peers);
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if (rp->tries > 20 || peers->single) {
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ngx_http_upstream_rr_peers_unlock(peers);
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return ngx_http_upstream_get_round_robin_peer(pc, rrp);
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}
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pc->cached = 0;
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pc->connection = NULL;
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now = ngx_time();
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prev = NULL;
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#if (NGX_SUPPRESS_WARN)
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p = 0;
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#endif
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for ( ;; ) {
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i = ngx_http_upstream_peek_random_peer(peers, rp);
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peer = rp->conf->ranges[i].peer;
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if (peer == prev) {
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goto next;
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}
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n = i / (8 * sizeof(uintptr_t));
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m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
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if (rrp->tried[n] & m) {
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goto next;
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}
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if (peer->down) {
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goto next;
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}
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if (peer->max_fails
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&& peer->fails >= peer->max_fails
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&& now - peer->checked <= peer->fail_timeout)
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{
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goto next;
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}
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if (peer->max_conns && peer->conns >= peer->max_conns) {
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goto next;
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}
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if (prev) {
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if (peer->conns * prev->weight > prev->conns * peer->weight) {
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peer = prev;
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n = p / (8 * sizeof(uintptr_t));
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m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
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}
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break;
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}
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prev = peer;
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p = i;
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next:
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if (++rp->tries > 20) {
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ngx_http_upstream_rr_peers_unlock(peers);
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return ngx_http_upstream_get_round_robin_peer(pc, rrp);
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}
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}
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rrp->current = peer;
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if (now - peer->checked > peer->fail_timeout) {
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peer->checked = now;
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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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peer->conns++;
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ngx_http_upstream_rr_peers_unlock(peers);
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rrp->tried[n] |= m;
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return NGX_OK;
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}
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static ngx_uint_t
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ngx_http_upstream_peek_random_peer(ngx_http_upstream_rr_peers_t *peers,
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ngx_http_upstream_random_peer_data_t *rp)
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{
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ngx_uint_t i, j, k, x;
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x = ngx_random() % peers->total_weight;
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i = 0;
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j = peers->number;
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while (j - i > 1) {
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k = (i + j) / 2;
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if (x < rp->conf->ranges[k].range) {
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j = k;
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} else {
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i = k;
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}
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}
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return i;
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}
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static void *
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ngx_http_upstream_random_create_conf(ngx_conf_t *cf)
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{
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ngx_http_upstream_random_srv_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_random_srv_conf_t));
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if (conf == NULL) {
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return NULL;
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}
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/*
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* set by ngx_pcalloc():
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*
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* conf->two = 0;
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*/
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return conf;
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}
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static char *
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ngx_http_upstream_random(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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ngx_http_upstream_random_srv_conf_t *rcf = conf;
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ngx_str_t *value;
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ngx_http_upstream_srv_conf_t *uscf;
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uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
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if (uscf->peer.init_upstream) {
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ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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"load balancing method redefined");
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}
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uscf->peer.init_upstream = ngx_http_upstream_init_random;
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uscf->flags = NGX_HTTP_UPSTREAM_CREATE
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|NGX_HTTP_UPSTREAM_WEIGHT
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|NGX_HTTP_UPSTREAM_MAX_CONNS
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|NGX_HTTP_UPSTREAM_MAX_FAILS
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|NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
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|NGX_HTTP_UPSTREAM_DOWN;
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if (cf->args->nelts == 1) {
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return NGX_CONF_OK;
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}
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value = cf->args->elts;
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if (ngx_strcmp(value[1].data, "two") == 0) {
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rcf->two = 1;
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} else {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"invalid parameter \"%V\"", &value[1]);
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return NGX_CONF_ERROR;
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}
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if (cf->args->nelts == 2) {
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return NGX_CONF_OK;
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}
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if (ngx_strcmp(value[2].data, "least_conn") != 0) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"invalid parameter \"%V\"", &value[2]);
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return NGX_CONF_ERROR;
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}
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return NGX_CONF_OK;
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}
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