initial commit
This commit is contained in:
@@ -0,0 +1,686 @@
|
||||
|
||||
/*
|
||||
* Copyright (C) Roman Arutyunyan
|
||||
* Copyright (C) Nginx, Inc.
|
||||
*/
|
||||
|
||||
|
||||
#include <ngx_config.h>
|
||||
#include <ngx_core.h>
|
||||
#include <ngx_http.h>
|
||||
|
||||
|
||||
typedef struct {
|
||||
uint32_t hash;
|
||||
ngx_str_t *server;
|
||||
} ngx_http_upstream_chash_point_t;
|
||||
|
||||
|
||||
typedef struct {
|
||||
ngx_uint_t number;
|
||||
ngx_http_upstream_chash_point_t point[1];
|
||||
} ngx_http_upstream_chash_points_t;
|
||||
|
||||
|
||||
typedef struct {
|
||||
ngx_http_complex_value_t key;
|
||||
ngx_http_upstream_chash_points_t *points;
|
||||
} ngx_http_upstream_hash_srv_conf_t;
|
||||
|
||||
|
||||
typedef struct {
|
||||
/* the round robin data must be first */
|
||||
ngx_http_upstream_rr_peer_data_t rrp;
|
||||
ngx_http_upstream_hash_srv_conf_t *conf;
|
||||
ngx_str_t key;
|
||||
ngx_uint_t tries;
|
||||
ngx_uint_t rehash;
|
||||
uint32_t hash;
|
||||
ngx_event_get_peer_pt get_rr_peer;
|
||||
} ngx_http_upstream_hash_peer_data_t;
|
||||
|
||||
|
||||
static ngx_int_t ngx_http_upstream_init_hash(ngx_conf_t *cf,
|
||||
ngx_http_upstream_srv_conf_t *us);
|
||||
static ngx_int_t ngx_http_upstream_init_hash_peer(ngx_http_request_t *r,
|
||||
ngx_http_upstream_srv_conf_t *us);
|
||||
static ngx_int_t ngx_http_upstream_get_hash_peer(ngx_peer_connection_t *pc,
|
||||
void *data);
|
||||
|
||||
static ngx_int_t ngx_http_upstream_init_chash(ngx_conf_t *cf,
|
||||
ngx_http_upstream_srv_conf_t *us);
|
||||
static int ngx_libc_cdecl
|
||||
ngx_http_upstream_chash_cmp_points(const void *one, const void *two);
|
||||
static ngx_uint_t ngx_http_upstream_find_chash_point(
|
||||
ngx_http_upstream_chash_points_t *points, uint32_t hash);
|
||||
static ngx_int_t ngx_http_upstream_init_chash_peer(ngx_http_request_t *r,
|
||||
ngx_http_upstream_srv_conf_t *us);
|
||||
static ngx_int_t ngx_http_upstream_get_chash_peer(ngx_peer_connection_t *pc,
|
||||
void *data);
|
||||
|
||||
static void *ngx_http_upstream_hash_create_conf(ngx_conf_t *cf);
|
||||
static char *ngx_http_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd,
|
||||
void *conf);
|
||||
|
||||
|
||||
static ngx_command_t ngx_http_upstream_hash_commands[] = {
|
||||
|
||||
{ ngx_string("hash"),
|
||||
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE12,
|
||||
ngx_http_upstream_hash,
|
||||
NGX_HTTP_SRV_CONF_OFFSET,
|
||||
0,
|
||||
NULL },
|
||||
|
||||
ngx_null_command
|
||||
};
|
||||
|
||||
|
||||
static ngx_http_module_t ngx_http_upstream_hash_module_ctx = {
|
||||
NULL, /* preconfiguration */
|
||||
NULL, /* postconfiguration */
|
||||
|
||||
NULL, /* create main configuration */
|
||||
NULL, /* init main configuration */
|
||||
|
||||
ngx_http_upstream_hash_create_conf, /* create server configuration */
|
||||
NULL, /* merge server configuration */
|
||||
|
||||
NULL, /* create location configuration */
|
||||
NULL /* merge location configuration */
|
||||
};
|
||||
|
||||
|
||||
ngx_module_t ngx_http_upstream_hash_module = {
|
||||
NGX_MODULE_V1,
|
||||
&ngx_http_upstream_hash_module_ctx, /* module context */
|
||||
ngx_http_upstream_hash_commands, /* module directives */
|
||||
NGX_HTTP_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_http_upstream_init_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
|
||||
{
|
||||
if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
us->peer.init = ngx_http_upstream_init_hash_peer;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_http_upstream_init_hash_peer(ngx_http_request_t *r,
|
||||
ngx_http_upstream_srv_conf_t *us)
|
||||
{
|
||||
ngx_http_upstream_hash_srv_conf_t *hcf;
|
||||
ngx_http_upstream_hash_peer_data_t *hp;
|
||||
|
||||
hp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_hash_peer_data_t));
|
||||
if (hp == NULL) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
r->upstream->peer.data = &hp->rrp;
|
||||
|
||||
if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
r->upstream->peer.get = ngx_http_upstream_get_hash_peer;
|
||||
|
||||
hcf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_hash_module);
|
||||
|
||||
if (ngx_http_complex_value(r, &hcf->key, &hp->key) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
||||
"upstream hash key:\"%V\"", &hp->key);
|
||||
|
||||
hp->conf = hcf;
|
||||
hp->tries = 0;
|
||||
hp->rehash = 0;
|
||||
hp->hash = 0;
|
||||
hp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_http_upstream_get_hash_peer(ngx_peer_connection_t *pc, void *data)
|
||||
{
|
||||
ngx_http_upstream_hash_peer_data_t *hp = data;
|
||||
|
||||
time_t now;
|
||||
u_char buf[NGX_INT_T_LEN];
|
||||
size_t size;
|
||||
uint32_t hash;
|
||||
ngx_int_t w;
|
||||
uintptr_t m;
|
||||
ngx_uint_t n, p;
|
||||
ngx_http_upstream_rr_peer_t *peer;
|
||||
|
||||
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
||||
"get hash peer, try: %ui", pc->tries);
|
||||
|
||||
ngx_http_upstream_rr_peers_rlock(hp->rrp.peers);
|
||||
|
||||
if (hp->tries > 20 || hp->rrp.peers->single || hp->key.len == 0) {
|
||||
ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
|
||||
return hp->get_rr_peer(pc, &hp->rrp);
|
||||
}
|
||||
|
||||
now = ngx_time();
|
||||
|
||||
pc->cached = 0;
|
||||
pc->connection = NULL;
|
||||
|
||||
for ( ;; ) {
|
||||
|
||||
/*
|
||||
* Hash expression is compatible with Cache::Memcached:
|
||||
* ((crc32([REHASH] KEY) >> 16) & 0x7fff) + PREV_HASH
|
||||
* with REHASH omitted at the first iteration.
|
||||
*/
|
||||
|
||||
ngx_crc32_init(hash);
|
||||
|
||||
if (hp->rehash > 0) {
|
||||
size = ngx_sprintf(buf, "%ui", hp->rehash) - buf;
|
||||
ngx_crc32_update(&hash, buf, size);
|
||||
}
|
||||
|
||||
ngx_crc32_update(&hash, hp->key.data, hp->key.len);
|
||||
ngx_crc32_final(hash);
|
||||
|
||||
hash = (hash >> 16) & 0x7fff;
|
||||
|
||||
hp->hash += hash;
|
||||
hp->rehash++;
|
||||
|
||||
w = hp->hash % hp->rrp.peers->total_weight;
|
||||
peer = hp->rrp.peers->peer;
|
||||
p = 0;
|
||||
|
||||
while (w >= peer->weight) {
|
||||
w -= peer->weight;
|
||||
peer = peer->next;
|
||||
p++;
|
||||
}
|
||||
|
||||
n = p / (8 * sizeof(uintptr_t));
|
||||
m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
|
||||
|
||||
if (hp->rrp.tried[n] & m) {
|
||||
goto next;
|
||||
}
|
||||
|
||||
ngx_http_upstream_rr_peer_lock(hp->rrp.peers, peer);
|
||||
|
||||
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
||||
"get hash peer, value:%uD, peer:%ui", hp->hash, p);
|
||||
|
||||
if (peer->down) {
|
||||
ngx_http_upstream_rr_peer_unlock(hp->rrp.peers, peer);
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_fails
|
||||
&& peer->fails >= peer->max_fails
|
||||
&& now - peer->checked <= peer->fail_timeout)
|
||||
{
|
||||
ngx_http_upstream_rr_peer_unlock(hp->rrp.peers, peer);
|
||||
goto next;
|
||||
}
|
||||
|
||||
if (peer->max_conns && peer->conns >= peer->max_conns) {
|
||||
ngx_http_upstream_rr_peer_unlock(hp->rrp.peers, peer);
|
||||
goto next;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
next:
|
||||
|
||||
if (++hp->tries > 20) {
|
||||
ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
|
||||
return hp->get_rr_peer(pc, &hp->rrp);
|
||||
}
|
||||
}
|
||||
|
||||
hp->rrp.current = peer;
|
||||
|
||||
pc->sockaddr = peer->sockaddr;
|
||||
pc->socklen = peer->socklen;
|
||||
pc->name = &peer->name;
|
||||
|
||||
peer->conns++;
|
||||
|
||||
if (now - peer->checked > peer->fail_timeout) {
|
||||
peer->checked = now;
|
||||
}
|
||||
|
||||
ngx_http_upstream_rr_peer_unlock(hp->rrp.peers, peer);
|
||||
ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
|
||||
|
||||
hp->rrp.tried[n] |= m;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_http_upstream_init_chash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
|
||||
{
|
||||
u_char *host, *port, c;
|
||||
size_t host_len, port_len, size;
|
||||
uint32_t hash, base_hash;
|
||||
ngx_str_t *server;
|
||||
ngx_uint_t npoints, i, j;
|
||||
ngx_http_upstream_rr_peer_t *peer;
|
||||
ngx_http_upstream_rr_peers_t *peers;
|
||||
ngx_http_upstream_chash_points_t *points;
|
||||
ngx_http_upstream_hash_srv_conf_t *hcf;
|
||||
union {
|
||||
uint32_t value;
|
||||
u_char byte[4];
|
||||
} prev_hash;
|
||||
|
||||
if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
us->peer.init = ngx_http_upstream_init_chash_peer;
|
||||
|
||||
peers = us->peer.data;
|
||||
npoints = peers->total_weight * 160;
|
||||
|
||||
size = sizeof(ngx_http_upstream_chash_points_t)
|
||||
+ sizeof(ngx_http_upstream_chash_point_t) * (npoints - 1);
|
||||
|
||||
points = ngx_palloc(cf->pool, size);
|
||||
if (points == NULL) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
points->number = 0;
|
||||
|
||||
for (peer = peers->peer; peer; peer = peer->next) {
|
||||
server = &peer->server;
|
||||
|
||||
/*
|
||||
* Hash expression is compatible with Cache::Memcached::Fast:
|
||||
* crc32(HOST \0 PORT PREV_HASH).
|
||||
*/
|
||||
|
||||
if (server->len >= 5
|
||||
&& ngx_strncasecmp(server->data, (u_char *) "unix:", 5) == 0)
|
||||
{
|
||||
host = server->data + 5;
|
||||
host_len = server->len - 5;
|
||||
port = NULL;
|
||||
port_len = 0;
|
||||
goto done;
|
||||
}
|
||||
|
||||
for (j = 0; j < server->len; j++) {
|
||||
c = server->data[server->len - j - 1];
|
||||
|
||||
if (c == ':') {
|
||||
host = server->data;
|
||||
host_len = server->len - j - 1;
|
||||
port = server->data + server->len - j;
|
||||
port_len = j;
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (c < '0' || c > '9') {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
host = server->data;
|
||||
host_len = server->len;
|
||||
port = NULL;
|
||||
port_len = 0;
|
||||
|
||||
done:
|
||||
|
||||
ngx_crc32_init(base_hash);
|
||||
ngx_crc32_update(&base_hash, host, host_len);
|
||||
ngx_crc32_update(&base_hash, (u_char *) "", 1);
|
||||
ngx_crc32_update(&base_hash, port, port_len);
|
||||
|
||||
prev_hash.value = 0;
|
||||
npoints = peer->weight * 160;
|
||||
|
||||
for (j = 0; j < npoints; j++) {
|
||||
hash = base_hash;
|
||||
|
||||
ngx_crc32_update(&hash, prev_hash.byte, 4);
|
||||
ngx_crc32_final(hash);
|
||||
|
||||
points->point[points->number].hash = hash;
|
||||
points->point[points->number].server = server;
|
||||
points->number++;
|
||||
|
||||
#if (NGX_HAVE_LITTLE_ENDIAN)
|
||||
prev_hash.value = hash;
|
||||
#else
|
||||
prev_hash.byte[0] = (u_char) (hash & 0xff);
|
||||
prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff);
|
||||
prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff);
|
||||
prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff);
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
ngx_qsort(points->point,
|
||||
points->number,
|
||||
sizeof(ngx_http_upstream_chash_point_t),
|
||||
ngx_http_upstream_chash_cmp_points);
|
||||
|
||||
for (i = 0, j = 1; j < points->number; j++) {
|
||||
if (points->point[i].hash != points->point[j].hash) {
|
||||
points->point[++i] = points->point[j];
|
||||
}
|
||||
}
|
||||
|
||||
points->number = i + 1;
|
||||
|
||||
hcf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_hash_module);
|
||||
hcf->points = points;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static int ngx_libc_cdecl
|
||||
ngx_http_upstream_chash_cmp_points(const void *one, const void *two)
|
||||
{
|
||||
ngx_http_upstream_chash_point_t *first =
|
||||
(ngx_http_upstream_chash_point_t *) one;
|
||||
ngx_http_upstream_chash_point_t *second =
|
||||
(ngx_http_upstream_chash_point_t *) two;
|
||||
|
||||
if (first->hash < second->hash) {
|
||||
return -1;
|
||||
|
||||
} else if (first->hash > second->hash) {
|
||||
return 1;
|
||||
|
||||
} else {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static ngx_uint_t
|
||||
ngx_http_upstream_find_chash_point(ngx_http_upstream_chash_points_t *points,
|
||||
uint32_t hash)
|
||||
{
|
||||
ngx_uint_t i, j, k;
|
||||
ngx_http_upstream_chash_point_t *point;
|
||||
|
||||
/* find first point >= hash */
|
||||
|
||||
point = &points->point[0];
|
||||
|
||||
i = 0;
|
||||
j = points->number;
|
||||
|
||||
while (i < j) {
|
||||
k = (i + j) / 2;
|
||||
|
||||
if (hash > point[k].hash) {
|
||||
i = k + 1;
|
||||
|
||||
} else if (hash < point[k].hash) {
|
||||
j = k;
|
||||
|
||||
} else {
|
||||
return k;
|
||||
}
|
||||
}
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_http_upstream_init_chash_peer(ngx_http_request_t *r,
|
||||
ngx_http_upstream_srv_conf_t *us)
|
||||
{
|
||||
uint32_t hash;
|
||||
ngx_http_upstream_hash_srv_conf_t *hcf;
|
||||
ngx_http_upstream_hash_peer_data_t *hp;
|
||||
|
||||
if (ngx_http_upstream_init_hash_peer(r, us) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
r->upstream->peer.get = ngx_http_upstream_get_chash_peer;
|
||||
|
||||
hp = r->upstream->peer.data;
|
||||
hcf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_hash_module);
|
||||
|
||||
hash = ngx_crc32_long(hp->key.data, hp->key.len);
|
||||
|
||||
ngx_http_upstream_rr_peers_rlock(hp->rrp.peers);
|
||||
|
||||
hp->hash = ngx_http_upstream_find_chash_point(hcf->points, hash);
|
||||
|
||||
ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_http_upstream_get_chash_peer(ngx_peer_connection_t *pc, void *data)
|
||||
{
|
||||
ngx_http_upstream_hash_peer_data_t *hp = data;
|
||||
|
||||
time_t now;
|
||||
intptr_t m;
|
||||
ngx_str_t *server;
|
||||
ngx_int_t total;
|
||||
ngx_uint_t i, n, best_i;
|
||||
ngx_http_upstream_rr_peer_t *peer, *best;
|
||||
ngx_http_upstream_chash_point_t *point;
|
||||
ngx_http_upstream_chash_points_t *points;
|
||||
ngx_http_upstream_hash_srv_conf_t *hcf;
|
||||
|
||||
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
||||
"get consistent hash peer, try: %ui", pc->tries);
|
||||
|
||||
ngx_http_upstream_rr_peers_wlock(hp->rrp.peers);
|
||||
|
||||
if (hp->tries > 20 || hp->rrp.peers->single || hp->key.len == 0) {
|
||||
ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
|
||||
return hp->get_rr_peer(pc, &hp->rrp);
|
||||
}
|
||||
|
||||
pc->cached = 0;
|
||||
pc->connection = NULL;
|
||||
|
||||
now = ngx_time();
|
||||
hcf = hp->conf;
|
||||
|
||||
points = hcf->points;
|
||||
point = &points->point[0];
|
||||
|
||||
for ( ;; ) {
|
||||
server = point[hp->hash % points->number].server;
|
||||
|
||||
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
||||
"consistent hash peer:%uD, server:\"%V\"",
|
||||
hp->hash, server);
|
||||
|
||||
best = NULL;
|
||||
best_i = 0;
|
||||
total = 0;
|
||||
|
||||
for (peer = hp->rrp.peers->peer, i = 0;
|
||||
peer;
|
||||
peer = peer->next, i++)
|
||||
{
|
||||
n = i / (8 * sizeof(uintptr_t));
|
||||
m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
|
||||
|
||||
if (hp->rrp.tried[n] & m) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (peer->down) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (peer->max_fails
|
||||
&& peer->fails >= peer->max_fails
|
||||
&& now - peer->checked <= peer->fail_timeout)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
if (peer->max_conns && peer->conns >= peer->max_conns) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (peer->server.len != server->len
|
||||
|| ngx_strncmp(peer->server.data, server->data, server->len)
|
||||
!= 0)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
peer->current_weight += peer->effective_weight;
|
||||
total += peer->effective_weight;
|
||||
|
||||
if (peer->effective_weight < peer->weight) {
|
||||
peer->effective_weight++;
|
||||
}
|
||||
|
||||
if (best == NULL || peer->current_weight > best->current_weight) {
|
||||
best = peer;
|
||||
best_i = i;
|
||||
}
|
||||
}
|
||||
|
||||
if (best) {
|
||||
best->current_weight -= total;
|
||||
goto found;
|
||||
}
|
||||
|
||||
hp->hash++;
|
||||
hp->tries++;
|
||||
|
||||
if (hp->tries > 20) {
|
||||
ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
|
||||
return hp->get_rr_peer(pc, &hp->rrp);
|
||||
}
|
||||
}
|
||||
|
||||
found:
|
||||
|
||||
hp->rrp.current = best;
|
||||
|
||||
pc->sockaddr = best->sockaddr;
|
||||
pc->socklen = best->socklen;
|
||||
pc->name = &best->name;
|
||||
|
||||
best->conns++;
|
||||
|
||||
if (now - best->checked > best->fail_timeout) {
|
||||
best->checked = now;
|
||||
}
|
||||
|
||||
ngx_http_upstream_rr_peers_unlock(hp->rrp.peers);
|
||||
|
||||
n = best_i / (8 * sizeof(uintptr_t));
|
||||
m = (uintptr_t) 1 << best_i % (8 * sizeof(uintptr_t));
|
||||
|
||||
hp->rrp.tried[n] |= m;
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static void *
|
||||
ngx_http_upstream_hash_create_conf(ngx_conf_t *cf)
|
||||
{
|
||||
ngx_http_upstream_hash_srv_conf_t *conf;
|
||||
|
||||
conf = ngx_palloc(cf->pool, sizeof(ngx_http_upstream_hash_srv_conf_t));
|
||||
if (conf == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
conf->points = NULL;
|
||||
|
||||
return conf;
|
||||
}
|
||||
|
||||
|
||||
static char *
|
||||
ngx_http_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
||||
{
|
||||
ngx_http_upstream_hash_srv_conf_t *hcf = conf;
|
||||
|
||||
ngx_str_t *value;
|
||||
ngx_http_upstream_srv_conf_t *uscf;
|
||||
ngx_http_compile_complex_value_t ccv;
|
||||
|
||||
value = cf->args->elts;
|
||||
|
||||
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
||||
|
||||
ccv.cf = cf;
|
||||
ccv.value = &value[1];
|
||||
ccv.complex_value = &hcf->key;
|
||||
|
||||
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
||||
return NGX_CONF_ERROR;
|
||||
}
|
||||
|
||||
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->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 == 2) {
|
||||
uscf->peer.init_upstream = ngx_http_upstream_init_hash;
|
||||
|
||||
} else if (ngx_strcmp(value[2].data, "consistent") == 0) {
|
||||
uscf->peer.init_upstream = ngx_http_upstream_init_chash;
|
||||
|
||||
} else {
|
||||
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
||||
"invalid parameter \"%V\"", &value[2]);
|
||||
return NGX_CONF_ERROR;
|
||||
}
|
||||
|
||||
return NGX_CONF_OK;
|
||||
}
|
||||
Reference in New Issue
Block a user