Initial commit
This commit is contained in:
Hakase
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/*
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* Copyright (C) Igor Sysoev
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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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/* the round robin data must be first */
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ngx_http_upstream_rr_peer_data_t rrp;
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ngx_uint_t hash;
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u_char addrlen;
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u_char *addr;
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u_char tries;
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ngx_event_get_peer_pt get_rr_peer;
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} ngx_http_upstream_ip_hash_peer_data_t;
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static ngx_int_t ngx_http_upstream_init_ip_hash_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_ip_hash_peer(ngx_peer_connection_t *pc,
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void *data);
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static char *ngx_http_upstream_ip_hash(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_ip_hash_commands[] = {
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{ ngx_string("ip_hash"),
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NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS,
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ngx_http_upstream_ip_hash,
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0,
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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_ip_hash_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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NULL, /* 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_ip_hash_module = {
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NGX_MODULE_V1,
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&ngx_http_upstream_ip_hash_module_ctx, /* module context */
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ngx_http_upstream_ip_hash_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 u_char ngx_http_upstream_ip_hash_pseudo_addr[3];
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static ngx_int_t
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ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
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{
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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_ip_hash_peer;
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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_ip_hash_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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struct sockaddr_in *sin;
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#if (NGX_HAVE_INET6)
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struct sockaddr_in6 *sin6;
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#endif
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ngx_http_upstream_ip_hash_peer_data_t *iphp;
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iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t));
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if (iphp == NULL) {
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return NGX_ERROR;
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}
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r->upstream->peer.data = &iphp->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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r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer;
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switch (r->connection->sockaddr->sa_family) {
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case AF_INET:
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sin = (struct sockaddr_in *) r->connection->sockaddr;
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iphp->addr = (u_char *) &sin->sin_addr.s_addr;
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iphp->addrlen = 3;
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break;
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#if (NGX_HAVE_INET6)
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
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iphp->addr = (u_char *) &sin6->sin6_addr.s6_addr;
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iphp->addrlen = 16;
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break;
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#endif
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default:
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iphp->addr = ngx_http_upstream_ip_hash_pseudo_addr;
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iphp->addrlen = 3;
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}
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iphp->hash = 89;
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iphp->tries = 0;
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iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;
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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_ip_hash_peer(ngx_peer_connection_t *pc, void *data)
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{
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ngx_http_upstream_ip_hash_peer_data_t *iphp = data;
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time_t now;
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ngx_int_t w;
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uintptr_t m;
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ngx_uint_t i, n, p, hash;
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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 ip hash peer, try: %ui", pc->tries);
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/* TODO: cached */
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ngx_http_upstream_rr_peers_wlock(iphp->rrp.peers);
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if (iphp->tries > 20 || iphp->rrp.peers->single) {
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ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers);
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return iphp->get_rr_peer(pc, &iphp->rrp);
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}
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now = ngx_time();
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pc->cached = 0;
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pc->connection = NULL;
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hash = iphp->hash;
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for ( ;; ) {
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for (i = 0; i < (ngx_uint_t) iphp->addrlen; i++) {
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hash = (hash * 113 + iphp->addr[i]) % 6271;
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}
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w = hash % iphp->rrp.peers->total_weight;
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peer = iphp->rrp.peers->peer;
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p = 0;
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while (w >= peer->weight) {
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w -= peer->weight;
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peer = peer->next;
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p++;
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}
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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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if (iphp->rrp.tried[n] & m) {
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goto next;
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}
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ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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"get ip hash peer, hash: %ui %04XL", p, (uint64_t) m);
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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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break;
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next:
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if (++iphp->tries > 20) {
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ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers);
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return iphp->get_rr_peer(pc, &iphp->rrp);
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}
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}
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iphp->rrp.current = peer;
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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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if (now - peer->checked > peer->fail_timeout) {
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peer->checked = now;
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}
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ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers);
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iphp->rrp.tried[n] |= m;
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iphp->hash = hash;
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return NGX_OK;
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}
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static char *
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ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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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_ip_hash;
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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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return NGX_CONF_OK;
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}
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