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https://github.com/nginx/nginx.git
synced 2024-11-24 04:49:01 +08:00
Upstream: ngx_http_upstream_random module.
The module implements random load-balancing algorithm with optional second
choice. In the latter case, the best of two servers is chosen, accounting
number of connections and server weight.
Example:
upstream u {
random [two [least_conn]];
server 127.0.0.1:8080;
server 127.0.0.1:8081;
server 127.0.0.1:8082;
server 127.0.0.1:8083;
}
This commit is contained in:
Vladimir Homutov
parent
2eab9efbe4
commit
0c4ccbea23
21
auto/modules
21
auto/modules
@ -878,6 +878,17 @@ if [ $HTTP = YES ]; then
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. auto/module
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fi
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if [ $HTTP_UPSTREAM_RANDOM = YES ]; then
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ngx_module_name=ngx_http_upstream_random_module
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ngx_module_incs=
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ngx_module_deps=
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ngx_module_srcs=src/http/modules/ngx_http_upstream_random_module.c
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ngx_module_libs=
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ngx_module_link=$HTTP_UPSTREAM_RANDOM
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. auto/module
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fi
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if [ $HTTP_UPSTREAM_KEEPALIVE = YES ]; then
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ngx_module_name=ngx_http_upstream_keepalive_module
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ngx_module_incs=
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@ -1143,6 +1154,16 @@ if [ $STREAM != NO ]; then
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. auto/module
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fi
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if [ $STREAM_UPSTREAM_RANDOM = YES ]; then
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ngx_module_name=ngx_stream_upstream_random_module
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ngx_module_deps=
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ngx_module_srcs=src/stream/ngx_stream_upstream_random_module.c
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ngx_module_libs=
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ngx_module_link=$STREAM_UPSTREAM_RANDOM
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. auto/module
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fi
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if [ $STREAM_UPSTREAM_ZONE = YES ]; then
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have=NGX_STREAM_UPSTREAM_ZONE . auto/have
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10
auto/options
10
auto/options
@ -102,6 +102,7 @@ HTTP_GZIP_STATIC=NO
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HTTP_UPSTREAM_HASH=YES
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HTTP_UPSTREAM_IP_HASH=YES
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HTTP_UPSTREAM_LEAST_CONN=YES
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HTTP_UPSTREAM_RANDOM=YES
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HTTP_UPSTREAM_KEEPALIVE=YES
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HTTP_UPSTREAM_ZONE=YES
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@ -126,6 +127,7 @@ STREAM_SPLIT_CLIENTS=YES
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STREAM_RETURN=YES
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STREAM_UPSTREAM_HASH=YES
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STREAM_UPSTREAM_LEAST_CONN=YES
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STREAM_UPSTREAM_RANDOM=YES
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STREAM_UPSTREAM_ZONE=YES
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STREAM_SSL_PREREAD=NO
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@ -273,6 +275,8 @@ $0: warning: the \"--with-ipv6\" option is deprecated"
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--without-http_upstream_ip_hash_module) HTTP_UPSTREAM_IP_HASH=NO ;;
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--without-http_upstream_least_conn_module)
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HTTP_UPSTREAM_LEAST_CONN=NO ;;
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--without-http_upstream_random_module)
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HTTP_UPSTREAM_RANDOM=NO ;;
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--without-http_upstream_keepalive_module) HTTP_UPSTREAM_KEEPALIVE=NO ;;
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--without-http_upstream_zone_module) HTTP_UPSTREAM_ZONE=NO ;;
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@ -325,6 +329,8 @@ use the \"--with-mail_ssl_module\" option instead"
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STREAM_UPSTREAM_HASH=NO ;;
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--without-stream_upstream_least_conn_module)
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STREAM_UPSTREAM_LEAST_CONN=NO ;;
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--without-stream_upstream_random_module)
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STREAM_UPSTREAM_RANDOM=NO ;;
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--without-stream_upstream_zone_module)
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STREAM_UPSTREAM_ZONE=NO ;;
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@ -485,6 +491,8 @@ cat << END
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disable ngx_http_upstream_ip_hash_module
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--without-http_upstream_least_conn_module
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disable ngx_http_upstream_least_conn_module
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--without-http_upstream_random_module
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disable ngx_http_upstream_random_module
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--without-http_upstream_keepalive_module
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disable ngx_http_upstream_keepalive_module
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--without-http_upstream_zone_module
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@ -535,6 +543,8 @@ cat << END
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disable ngx_stream_upstream_hash_module
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--without-stream_upstream_least_conn_module
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disable ngx_stream_upstream_least_conn_module
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--without-stream_upstream_random_module
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disable ngx_stream_upstream_random_module
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--without-stream_upstream_zone_module
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disable ngx_stream_upstream_zone_module
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502
src/http/modules/ngx_http_upstream_random_module.c
Normal file
502
src/http/modules/ngx_http_upstream_random_module.c
Normal file
@ -0,0 +1,502 @@
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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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|
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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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|
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return NGX_OK;
|
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}
|
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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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|
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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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|
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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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|
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rrp = &rp->rrp;
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peers = rrp->peers;
|
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|
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ngx_http_upstream_rr_peers_wlock(peers);
|
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|
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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();
|
||||
|
||||
prev = NULL;
|
||||
|
||||
#if (NGX_SUPPRESS_WARN)
|
||||
p = 0;
|
||||
#endif
|
||||
|
||||
for ( ;; ) {
|
||||
|
||||
i = ngx_http_upstream_peek_random_peer(peers, rp);
|
||||
|
||||
peer = rp->conf->ranges[i].peer;
|
||||
|
||||
if (peer == prev) {
|
||||
goto next;
|
||||
}
|
||||
|
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n = i / (8 * sizeof(uintptr_t));
|
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m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
|
||||
|
||||
if (rrp->tried[n] & m) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->down) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_fails
|
||||
&& peer->fails >= peer->max_fails
|
||||
&& now - peer->checked <= peer->fail_timeout)
|
||||
{
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_conns && peer->conns >= peer->max_conns) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (prev) {
|
||||
if (peer->conns * prev->weight > prev->conns * peer->weight) {
|
||||
peer = prev;
|
||||
n = p / (8 * sizeof(uintptr_t));
|
||||
m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
prev = peer;
|
||||
p = i;
|
||||
|
||||
next:
|
||||
|
||||
if (++rp->tries > 20) {
|
||||
ngx_http_upstream_rr_peers_unlock(peers);
|
||||
return ngx_http_upstream_get_round_robin_peer(pc, rrp);
|
||||
}
|
||||
}
|
||||
|
||||
rrp->current = peer;
|
||||
|
||||
if (now - peer->checked > peer->fail_timeout) {
|
||||
peer->checked = now;
|
||||
}
|
||||
|
||||
pc->sockaddr = peer->sockaddr;
|
||||
pc->socklen = peer->socklen;
|
||||
pc->name = &peer->name;
|
||||
|
||||
peer->conns++;
|
||||
|
||||
ngx_http_upstream_rr_peers_unlock(peers);
|
||||
|
||||
rrp->tried[n] |= m;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_uint_t
|
||||
ngx_http_upstream_peek_random_peer(ngx_http_upstream_rr_peers_t *peers,
|
||||
ngx_http_upstream_random_peer_data_t *rp)
|
||||
{
|
||||
ngx_uint_t i, j, k, x;
|
||||
|
||||
x = ngx_random() % peers->total_weight;
|
||||
|
||||
i = 0;
|
||||
j = peers->number;
|
||||
|
||||
while (j - i > 1) {
|
||||
k = (i + j) / 2;
|
||||
|
||||
if (x < rp->conf->ranges[k].range) {
|
||||
j = k;
|
||||
|
||||
} else {
|
||||
i = k;
|
||||
}
|
||||
}
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
|
||||
static void *
|
||||
ngx_http_upstream_random_create_conf(ngx_conf_t *cf)
|
||||
{
|
||||
ngx_http_upstream_random_srv_conf_t *conf;
|
||||
|
||||
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_random_srv_conf_t));
|
||||
if (conf == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* set by ngx_pcalloc():
|
||||
*
|
||||
* conf->two = 0;
|
||||
*/
|
||||
|
||||
return conf;
|
||||
}
|
||||
|
||||
|
||||
static char *
|
||||
ngx_http_upstream_random(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
||||
{
|
||||
ngx_http_upstream_random_srv_conf_t *rcf = conf;
|
||||
|
||||
ngx_str_t *value;
|
||||
ngx_http_upstream_srv_conf_t *uscf;
|
||||
|
||||
uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
|
||||
|
||||
if (uscf->peer.init_upstream) {
|
||||
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
||||
"load balancing method redefined");
|
||||
}
|
||||
|
||||
uscf->peer.init_upstream = ngx_http_upstream_init_random;
|
||||
|
||||
uscf->flags = NGX_HTTP_UPSTREAM_CREATE
|
||||
|NGX_HTTP_UPSTREAM_WEIGHT
|
||||
|NGX_HTTP_UPSTREAM_MAX_CONNS
|
||||
|NGX_HTTP_UPSTREAM_MAX_FAILS
|
||||
|NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
|
||||
|NGX_HTTP_UPSTREAM_DOWN;
|
||||
|
||||
if (cf->args->nelts == 1) {
|
||||
return NGX_CONF_OK;
|
||||
}
|
||||
|
||||
value = cf->args->elts;
|
||||
|
||||
if (ngx_strcmp(value[1].data, "two") == 0) {
|
||||
rcf->two = 1;
|
||||
|
||||
} else {
|
||||
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
||||
"invalid parameter \"%V\"", &value[1]);
|
||||
return NGX_CONF_ERROR;
|
||||
}
|
||||
|
||||
if (cf->args->nelts == 2) {
|
||||
return NGX_CONF_OK;
|
||||
}
|
||||
|
||||
if (ngx_strcmp(value[2].data, "least_conn") != 0) {
|
||||
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
||||
"invalid parameter \"%V\"", &value[2]);
|
||||
return NGX_CONF_ERROR;
|
||||
}
|
||||
|
||||
return NGX_CONF_OK;
|
||||
}
|
||||
502
src/stream/ngx_stream_upstream_random_module.c
Normal file
502
src/stream/ngx_stream_upstream_random_module.c
Normal file
@ -0,0 +1,502 @@
|
||||
|
||||
/*
|
||||
* Copyright (C) Nginx, Inc.
|
||||
*/
|
||||
|
||||
|
||||
#include <ngx_config.h>
|
||||
#include <ngx_core.h>
|
||||
#include <ngx_stream.h>
|
||||
|
||||
|
||||
typedef struct {
|
||||
ngx_stream_upstream_rr_peer_t *peer;
|
||||
ngx_uint_t range;
|
||||
} ngx_stream_upstream_random_range_t;
|
||||
|
||||
|
||||
typedef struct {
|
||||
ngx_uint_t two;
|
||||
ngx_stream_upstream_random_range_t *ranges;
|
||||
} ngx_stream_upstream_random_srv_conf_t;
|
||||
|
||||
|
||||
typedef struct {
|
||||
/* the round robin data must be first */
|
||||
ngx_stream_upstream_rr_peer_data_t rrp;
|
||||
|
||||
ngx_stream_upstream_random_srv_conf_t *conf;
|
||||
u_char tries;
|
||||
} ngx_stream_upstream_random_peer_data_t;
|
||||
|
||||
|
||||
static ngx_int_t ngx_stream_upstream_init_random(ngx_conf_t *cf,
|
||||
ngx_stream_upstream_srv_conf_t *us);
|
||||
static ngx_int_t ngx_stream_upstream_update_random(ngx_pool_t *pool,
|
||||
ngx_stream_upstream_srv_conf_t *us);
|
||||
|
||||
static ngx_int_t ngx_stream_upstream_init_random_peer(ngx_stream_session_t *s,
|
||||
ngx_stream_upstream_srv_conf_t *us);
|
||||
static ngx_int_t ngx_stream_upstream_get_random_peer(ngx_peer_connection_t *pc,
|
||||
void *data);
|
||||
static ngx_int_t ngx_stream_upstream_get_random2_peer(ngx_peer_connection_t *pc,
|
||||
void *data);
|
||||
static ngx_uint_t ngx_stream_upstream_peek_random_peer(
|
||||
ngx_stream_upstream_rr_peers_t *peers,
|
||||
ngx_stream_upstream_random_peer_data_t *rp);
|
||||
static void *ngx_stream_upstream_random_create_conf(ngx_conf_t *cf);
|
||||
static char *ngx_stream_upstream_random(ngx_conf_t *cf, ngx_command_t *cmd,
|
||||
void *conf);
|
||||
|
||||
|
||||
static ngx_command_t ngx_stream_upstream_random_commands[] = {
|
||||
|
||||
{ ngx_string("random"),
|
||||
NGX_STREAM_UPS_CONF|NGX_CONF_NOARGS|NGX_CONF_TAKE12,
|
||||
ngx_stream_upstream_random,
|
||||
NGX_STREAM_SRV_CONF_OFFSET,
|
||||
0,
|
||||
NULL },
|
||||
|
||||
ngx_null_command
|
||||
};
|
||||
|
||||
|
||||
static ngx_stream_module_t ngx_stream_upstream_random_module_ctx = {
|
||||
NULL, /* preconfiguration */
|
||||
NULL, /* postconfiguration */
|
||||
|
||||
NULL, /* create main configuration */
|
||||
NULL, /* init main configuration */
|
||||
|
||||
ngx_stream_upstream_random_create_conf, /* create server configuration */
|
||||
NULL /* merge server configuration */
|
||||
};
|
||||
|
||||
|
||||
ngx_module_t ngx_stream_upstream_random_module = {
|
||||
NGX_MODULE_V1,
|
||||
&ngx_stream_upstream_random_module_ctx, /* module context */
|
||||
ngx_stream_upstream_random_commands, /* module directives */
|
||||
NGX_STREAM_MODULE, /* module type */
|
||||
NULL, /* init master */
|
||||
NULL, /* init module */
|
||||
NULL, /* init process */
|
||||
NULL, /* init thread */
|
||||
NULL, /* exit thread */
|
||||
NULL, /* exit process */
|
||||
NULL, /* exit master */
|
||||
NGX_MODULE_V1_PADDING
|
||||
};
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_stream_upstream_init_random(ngx_conf_t *cf,
|
||||
ngx_stream_upstream_srv_conf_t *us)
|
||||
{
|
||||
ngx_log_debug0(NGX_LOG_DEBUG_STREAM, cf->log, 0, "init random");
|
||||
|
||||
if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
us->peer.init = ngx_stream_upstream_init_random_peer;
|
||||
|
||||
#if (NGX_STREAM_UPSTREAM_ZONE)
|
||||
if (us->shm_zone) {
|
||||
return NGX_OK;
|
||||
}
|
||||
#endif
|
||||
|
||||
return ngx_stream_upstream_update_random(cf->pool, us);
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_stream_upstream_update_random(ngx_pool_t *pool,
|
||||
ngx_stream_upstream_srv_conf_t *us)
|
||||
{
|
||||
size_t size;
|
||||
ngx_uint_t i, total_weight;
|
||||
ngx_stream_upstream_rr_peer_t *peer;
|
||||
ngx_stream_upstream_rr_peers_t *peers;
|
||||
ngx_stream_upstream_random_range_t *ranges;
|
||||
ngx_stream_upstream_random_srv_conf_t *rcf;
|
||||
|
||||
rcf = ngx_stream_conf_upstream_srv_conf(us,
|
||||
ngx_stream_upstream_random_module);
|
||||
peers = us->peer.data;
|
||||
|
||||
size = peers->number * sizeof(ngx_stream_upstream_random_range_t);
|
||||
|
||||
ranges = pool ? ngx_palloc(pool, size) : ngx_alloc(size, ngx_cycle->log);
|
||||
if (ranges == NULL) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
total_weight = 0;
|
||||
|
||||
for (peer = peers->peer, i = 0; peer; peer = peer->next, i++) {
|
||||
ranges[i].peer = peer;
|
||||
ranges[i].range = total_weight;
|
||||
total_weight += peer->weight;
|
||||
}
|
||||
|
||||
rcf->ranges = ranges;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_stream_upstream_init_random_peer(ngx_stream_session_t *s,
|
||||
ngx_stream_upstream_srv_conf_t *us)
|
||||
{
|
||||
ngx_stream_upstream_random_srv_conf_t *rcf;
|
||||
ngx_stream_upstream_random_peer_data_t *rp;
|
||||
|
||||
ngx_log_debug0(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
|
||||
"init random peer");
|
||||
|
||||
rcf = ngx_stream_conf_upstream_srv_conf(us,
|
||||
ngx_stream_upstream_random_module);
|
||||
|
||||
rp = ngx_palloc(s->connection->pool,
|
||||
sizeof(ngx_stream_upstream_random_peer_data_t));
|
||||
if (rp == NULL) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
s->upstream->peer.data = &rp->rrp;
|
||||
|
||||
if (ngx_stream_upstream_init_round_robin_peer(s, us) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
if (rcf->two) {
|
||||
s->upstream->peer.get = ngx_stream_upstream_get_random2_peer;
|
||||
|
||||
} else {
|
||||
s->upstream->peer.get = ngx_stream_upstream_get_random_peer;
|
||||
}
|
||||
|
||||
rp->conf = rcf;
|
||||
rp->tries = 0;
|
||||
|
||||
ngx_stream_upstream_rr_peers_rlock(rp->rrp.peers);
|
||||
|
||||
#if (NGX_STREAM_UPSTREAM_ZONE)
|
||||
if (rp->rrp.peers->shpool && rcf->ranges == NULL) {
|
||||
if (ngx_stream_upstream_update_random(NULL, us) != NGX_OK) {
|
||||
ngx_stream_upstream_rr_peers_unlock(rp->rrp.peers);
|
||||
return NGX_ERROR;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
ngx_stream_upstream_rr_peers_unlock(rp->rrp.peers);
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_stream_upstream_get_random_peer(ngx_peer_connection_t *pc, void *data)
|
||||
{
|
||||
ngx_stream_upstream_random_peer_data_t *rp = data;
|
||||
|
||||
time_t now;
|
||||
uintptr_t m;
|
||||
ngx_uint_t i, n;
|
||||
ngx_stream_upstream_rr_peer_t *peer;
|
||||
ngx_stream_upstream_rr_peers_t *peers;
|
||||
ngx_stream_upstream_rr_peer_data_t *rrp;
|
||||
|
||||
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0,
|
||||
"get random peer, try: %ui", pc->tries);
|
||||
|
||||
rrp = &rp->rrp;
|
||||
peers = rrp->peers;
|
||||
|
||||
ngx_stream_upstream_rr_peers_rlock(peers);
|
||||
|
||||
if (rp->tries > 20 || peers->single) {
|
||||
ngx_stream_upstream_rr_peers_unlock(peers);
|
||||
return ngx_stream_upstream_get_round_robin_peer(pc, rrp);
|
||||
}
|
||||
|
||||
pc->cached = 0;
|
||||
pc->connection = NULL;
|
||||
|
||||
now = ngx_time();
|
||||
|
||||
for ( ;; ) {
|
||||
|
||||
i = ngx_stream_upstream_peek_random_peer(peers, rp);
|
||||
|
||||
peer = rp->conf->ranges[i].peer;
|
||||
|
||||
n = i / (8 * sizeof(uintptr_t));
|
||||
m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
|
||||
|
||||
if (rrp->tried[n] & m) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
ngx_stream_upstream_rr_peer_lock(peers, peer);
|
||||
|
||||
if (peer->down) {
|
||||
ngx_stream_upstream_rr_peer_unlock(peers, peer);
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_fails
|
||||
&& peer->fails >= peer->max_fails
|
||||
&& now - peer->checked <= peer->fail_timeout)
|
||||
{
|
||||
ngx_stream_upstream_rr_peer_unlock(peers, peer);
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_conns && peer->conns >= peer->max_conns) {
|
||||
ngx_stream_upstream_rr_peer_unlock(peers, peer);
|
||||
goto next;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
next:
|
||||
|
||||
if (++rp->tries > 20) {
|
||||
ngx_stream_upstream_rr_peers_unlock(peers);
|
||||
return ngx_stream_upstream_get_round_robin_peer(pc, rrp);
|
||||
}
|
||||
}
|
||||
|
||||
rrp->current = peer;
|
||||
|
||||
if (now - peer->checked > peer->fail_timeout) {
|
||||
peer->checked = now;
|
||||
}
|
||||
|
||||
pc->sockaddr = peer->sockaddr;
|
||||
pc->socklen = peer->socklen;
|
||||
pc->name = &peer->name;
|
||||
|
||||
peer->conns++;
|
||||
|
||||
ngx_stream_upstream_rr_peer_unlock(peers, peer);
|
||||
ngx_stream_upstream_rr_peers_unlock(peers);
|
||||
|
||||
rrp->tried[n] |= m;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_stream_upstream_get_random2_peer(ngx_peer_connection_t *pc, void *data)
|
||||
{
|
||||
ngx_stream_upstream_random_peer_data_t *rp = data;
|
||||
|
||||
time_t now;
|
||||
uintptr_t m;
|
||||
ngx_uint_t i, n, p;
|
||||
ngx_stream_upstream_rr_peer_t *peer, *prev;
|
||||
ngx_stream_upstream_rr_peers_t *peers;
|
||||
ngx_stream_upstream_rr_peer_data_t *rrp;
|
||||
|
||||
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0,
|
||||
"get random2 peer, try: %ui", pc->tries);
|
||||
|
||||
rrp = &rp->rrp;
|
||||
peers = rrp->peers;
|
||||
|
||||
ngx_stream_upstream_rr_peers_wlock(peers);
|
||||
|
||||
if (rp->tries > 20 || peers->single) {
|
||||
ngx_stream_upstream_rr_peers_unlock(peers);
|
||||
return ngx_stream_upstream_get_round_robin_peer(pc, rrp);
|
||||
}
|
||||
|
||||
pc->cached = 0;
|
||||
pc->connection = NULL;
|
||||
|
||||
now = ngx_time();
|
||||
|
||||
prev = NULL;
|
||||
|
||||
#if (NGX_SUPPRESS_WARN)
|
||||
p = 0;
|
||||
#endif
|
||||
|
||||
for ( ;; ) {
|
||||
|
||||
i = ngx_stream_upstream_peek_random_peer(peers, rp);
|
||||
|
||||
peer = rp->conf->ranges[i].peer;
|
||||
|
||||
if (peer == prev) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
n = i / (8 * sizeof(uintptr_t));
|
||||
m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
|
||||
|
||||
if (rrp->tried[n] & m) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->down) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_fails
|
||||
&& peer->fails >= peer->max_fails
|
||||
&& now - peer->checked <= peer->fail_timeout)
|
||||
{
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_conns && peer->conns >= peer->max_conns) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (prev) {
|
||||
if (peer->conns * prev->weight > prev->conns * peer->weight) {
|
||||
peer = prev;
|
||||
n = p / (8 * sizeof(uintptr_t));
|
||||
m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
prev = peer;
|
||||
p = i;
|
||||
|
||||
next:
|
||||
|
||||
if (++rp->tries > 20) {
|
||||
ngx_stream_upstream_rr_peers_unlock(peers);
|
||||
return ngx_stream_upstream_get_round_robin_peer(pc, rrp);
|
||||
}
|
||||
}
|
||||
|
||||
rrp->current = peer;
|
||||
|
||||
if (now - peer->checked > peer->fail_timeout) {
|
||||
peer->checked = now;
|
||||
}
|
||||
|
||||
pc->sockaddr = peer->sockaddr;
|
||||
pc->socklen = peer->socklen;
|
||||
pc->name = &peer->name;
|
||||
|
||||
peer->conns++;
|
||||
|
||||
ngx_stream_upstream_rr_peers_unlock(peers);
|
||||
|
||||
rrp->tried[n] |= m;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_uint_t
|
||||
ngx_stream_upstream_peek_random_peer(ngx_stream_upstream_rr_peers_t *peers,
|
||||
ngx_stream_upstream_random_peer_data_t *rp)
|
||||
{
|
||||
ngx_uint_t i, j, k, x;
|
||||
|
||||
x = ngx_random() % peers->total_weight;
|
||||
|
||||
i = 0;
|
||||
j = peers->number;
|
||||
|
||||
while (j - i > 1) {
|
||||
k = (i + j) / 2;
|
||||
|
||||
if (x < rp->conf->ranges[k].range) {
|
||||
j = k;
|
||||
|
||||
} else {
|
||||
i = k;
|
||||
}
|
||||
}
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
|
||||
static void *
|
||||
ngx_stream_upstream_random_create_conf(ngx_conf_t *cf)
|
||||
{
|
||||
ngx_stream_upstream_random_srv_conf_t *conf;
|
||||
|
||||
conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_upstream_random_srv_conf_t));
|
||||
if (conf == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* set by ngx_pcalloc():
|
||||
*
|
||||
* conf->two = 0;
|
||||
*/
|
||||
|
||||
return conf;
|
||||
}
|
||||
|
||||
|
||||
static char *
|
||||
ngx_stream_upstream_random(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
||||
{
|
||||
ngx_stream_upstream_random_srv_conf_t *rcf = conf;
|
||||
|
||||
ngx_str_t *value;
|
||||
ngx_stream_upstream_srv_conf_t *uscf;
|
||||
|
||||
uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module);
|
||||
|
||||
if (uscf->peer.init_upstream) {
|
||||
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
||||
"load balancing method redefined");
|
||||
}
|
||||
|
||||
uscf->peer.init_upstream = ngx_stream_upstream_init_random;
|
||||
|
||||
uscf->flags = NGX_STREAM_UPSTREAM_CREATE
|
||||
|NGX_STREAM_UPSTREAM_WEIGHT
|
||||
|NGX_STREAM_UPSTREAM_MAX_CONNS
|
||||
|NGX_STREAM_UPSTREAM_MAX_FAILS
|
||||
|NGX_STREAM_UPSTREAM_FAIL_TIMEOUT
|
||||
|NGX_STREAM_UPSTREAM_DOWN;
|
||||
|
||||
if (cf->args->nelts == 1) {
|
||||
return NGX_CONF_OK;
|
||||
}
|
||||
|
||||
value = cf->args->elts;
|
||||
|
||||
if (ngx_strcmp(value[1].data, "two") == 0) {
|
||||
rcf->two = 1;
|
||||
|
||||
} else {
|
||||
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
||||
"invalid parameter \"%V\"", &value[1]);
|
||||
return NGX_CONF_ERROR;
|
||||
}
|
||||
|
||||
if (cf->args->nelts == 2) {
|
||||
return NGX_CONF_OK;
|
||||
}
|
||||
|
||||
if (ngx_strcmp(value[2].data, "least_conn") != 0) {
|
||||
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
||||
"invalid parameter \"%V\"", &value[2]);
|
||||
return NGX_CONF_ERROR;
|
||||
}
|
||||
|
||||
return NGX_CONF_OK;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user