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ngx_http_limit_upstream_module.c
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/*
* Author: cfsego
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static ngx_rbtree_t ngx_http_limit_upstream_loc_rbtree;
static ngx_rbtree_node_t ngx_http_limit_upstream_sentinel;
typedef struct {
ngx_uint_t limit_conn;
ngx_uint_t backlog;
ngx_msec_t timeout;
ngx_shm_zone_t *shm_zone;
ngx_http_upstream_init_peer_pt init;
ngx_uint_t log_level;
unsigned hooked:1;
} ngx_http_limit_upstream_conf_t;
typedef struct {
ngx_rbtree_t *rbtree;
ngx_queue_t *queue;
} ngx_http_limit_upstream_zone_t;
typedef struct {
u_char color;
unsigned short port;
ngx_uint_t counter;
} ngx_http_limit_upstream_node_t;
typedef struct {
volatile ngx_uint_t counter;
ngx_msec_t last;
ngx_queue_t queue;
} ngx_http_limit_upstream_shm_t;
typedef struct {
ngx_uint_t counter;
ngx_uint_t qlen;
ngx_uint_t work;
ngx_queue_t wait;
} ngx_http_limit_upstream_loc_t;
typedef struct {
ngx_http_request_t *r;
ngx_http_limit_upstream_conf_t *lucf;
ngx_http_limit_upstream_loc_t *lnode;
void *data;
void *wait;
unsigned in_proc:1;
unsigned cln:1;
ngx_event_get_peer_pt get;
ngx_event_free_peer_pt free;
#if (NGX_HTTP_SSL)
ngx_event_set_peer_session_pt set_session;
ngx_event_save_peer_session_pt save_session;
#endif
struct sockaddr *sockaddr;
} ngx_http_limit_upstream_ctx_t;
typedef struct {
ngx_queue_t queue;
ngx_http_limit_upstream_ctx_t *ctx;
ngx_http_event_handler_pt read_event_handler;
ngx_http_event_handler_pt write_event_handler;
unsigned r_timer_set:1;
unsigned w_timer_set:1;
} ngx_http_limit_upstream_wait_t;
static ngx_conf_enum_t ngx_http_limit_upstream_log_levels[] = {
{ ngx_string("info"), NGX_LOG_INFO },
{ ngx_string("notice"), NGX_LOG_NOTICE },
{ ngx_string("warn"), NGX_LOG_WARN },
{ ngx_string("error"), NGX_LOG_ERR },
{ ngx_null_string, 0 }
};
static void ngx_http_limit_upstream_timeout(ngx_http_request_t *r);
static void ngx_http_limit_upstream_cleanup(void *data);
static void ngx_http_limit_upstream_free_peer(ngx_peer_connection_t *pc,
void *data, ngx_uint_t state);
static ngx_int_t ngx_http_limit_upstream_get_peer(ngx_peer_connection_t *pc,
void *data);
#if (NGX_HTTP_SSL)
static ngx_int_t ngx_http_limit_upstream_set_peer_session(
ngx_peer_connection_t *pc, void *data);
static void ngx_http_limit_upstream_save_peer_session(ngx_peer_connection_t *pc,
void *data);
#endif
static ngx_int_t ngx_http_limit_upstream_init_peer(ngx_http_request_t *r,
ngx_http_upstream_srv_conf_t *us);
static void *ngx_http_limit_upstream_create_srv_conf(ngx_conf_t *cf);
static char *ngx_http_limit_upstream_merge_srv_conf(ngx_conf_t *cf, void *parent,
void *child);
static char *ngx_http_limit_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_limit_upstream_conn(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_int_t ngx_http_limit_upstream_init(ngx_conf_t *cf);
static ngx_int_t ngx_http_limit_upstream_init_zone(ngx_shm_zone_t *shm_zone,
void *data);
static void ngx_http_limit_upstream_zone_expire(ngx_shm_zone_t *shm_zone);
static void
ngx_http_limit_upstream_rbtree_insert_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
static ngx_rbtree_node_t *
ngx_http_limit_upstream_rbtree_lookup(ngx_rbtree_t *rbtree,
unsigned long addr, unsigned short port);
static ngx_command_t ngx_http_limit_upstream_commands[] = {
{ ngx_string("limit_upstream_zone"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE2,
ngx_http_limit_upstream_zone,
0,
0,
NULL },
{ ngx_string("limit_upstream_conn"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1234|NGX_CONF_TAKE5,
ngx_http_limit_upstream_conn,
NGX_HTTP_SRV_CONF_OFFSET,
0,
NULL },
{ ngx_string("limit_upstream_log_level"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_conf_set_enum_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_limit_upstream_conf_t, log_level),
&ngx_http_limit_upstream_log_levels },
ngx_null_command
};
static ngx_http_module_t ngx_http_limit_upstream_module_ctx = {
NULL,
ngx_http_limit_upstream_init,
NULL,
NULL,
ngx_http_limit_upstream_create_srv_conf,
ngx_http_limit_upstream_merge_srv_conf,
NULL,
NULL
};
ngx_module_t ngx_http_limit_upstream_module = {
NGX_MODULE_V1,
&ngx_http_limit_upstream_module_ctx,
ngx_http_limit_upstream_commands,
NGX_HTTP_MODULE,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NGX_MODULE_V1_PADDING
};
static void
ngx_http_limit_upstream_timeout(ngx_http_request_t *r)
{
ngx_event_t *wev;
ngx_http_upstream_t *u;
ngx_http_limit_upstream_wait_t *w;
ngx_http_limit_upstream_loc_t *l;
ngx_http_limit_upstream_ctx_t *ctx;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"limit upstream: into timeout");
wev = r->connection->write;
if (!wev->timedout) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"limit upstream: wev ignored");
return;
}
u = r->upstream;
ctx = (ngx_http_limit_upstream_ctx_t *) u->peer.data;
ngx_log_error(ctx->lucf->log_level, r->connection->log, 0,
"limit upstream: request[%p] is timeout", r);
wev->timedout = 0;
if (u->cleanup) {
*u->cleanup = NULL;
u->cleanup = NULL;
}
w = ctx->wait;
ngx_queue_remove(&w->queue);
l = ctx->lnode;
l->qlen--;
ngx_http_finalize_request(r, NGX_HTTP_REQUEST_TIME_OUT);
}
static void
ngx_http_limit_upstream_cleanup(void *data)
{
ngx_queue_t *q;
ngx_rbtree_node_t *node_s, *node_l;
struct sockaddr_in *sin;
#if NGX_DEBUG
ngx_peer_connection_t *pc;
#endif
ngx_http_limit_upstream_ctx_t *ctx;
ngx_http_limit_upstream_loc_t *lnode;
ngx_http_limit_upstream_shm_t *snode;
ngx_http_limit_upstream_node_t *cnode;
ngx_http_limit_upstream_wait_t *wnode;
ngx_http_limit_upstream_zone_t *shmctx;
ctx = (ngx_http_limit_upstream_ctx_t *) data;
shmctx = ctx->lucf->shm_zone->data;
if (!ctx->in_proc) {
return;
}
#if NGX_DEBUG
pc = &ctx->r->upstream->peer;
#endif
sin = (struct sockaddr_in *) ctx->sockaddr;
node_s = ngx_http_limit_upstream_rbtree_lookup(shmctx->rbtree,
sin->sin_addr.s_addr,
sin->sin_port);
node_l = ngx_http_limit_upstream_rbtree_lookup(
&ngx_http_limit_upstream_loc_rbtree,
sin->sin_addr.s_addr,
sin->sin_port);
if (node_l == NULL && node_s == NULL) {
return;
}
#if 1
if ((node_l == NULL && node_s) || (node_s == NULL && node_l)) {
ngx_log_error(NGX_LOG_EMERG, ctx->r->connection->log, 0,
"limit upstream: only local or shm node exists");
return;
}
#endif
cnode = (ngx_http_limit_upstream_node_t *) &node_s->color;
snode = (ngx_http_limit_upstream_shm_t *) &cnode->counter;
cnode = (ngx_http_limit_upstream_node_t *) &node_l->color;
lnode = (ngx_http_limit_upstream_loc_t *) &cnode->counter;
lnode->work--;
if ((snode->counter > ctx->lucf->limit_conn && lnode->work)
|| lnode->qlen == 0)
{
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->r->connection->log, 0,
"limit upstream: will not resume request for %V "
"(counter: %d, active: %d, wait queue: %d)",
pc->name, snode->counter, lnode->work, lnode->qlen);
snode->counter--;
lnode->counter--;
return;
}
do {
q = ngx_queue_last(&lnode->wait);
wnode = ngx_queue_data(q, ngx_http_limit_upstream_wait_t, queue);
ngx_log_debug5(NGX_LOG_DEBUG_HTTP, ctx->r->connection->log, 0,
"limit upstream: remove queue node: %p for %V "
"(counter: %d, active: %d, wait queue: %d)",
q, pc->name, snode->counter,
lnode->work, lnode->qlen);
ngx_queue_remove(q);
lnode->qlen--;
/* resume a request in wait queue */
ctx = wnode->ctx;
ngx_log_error(ctx->lucf->log_level, ctx->r->connection->log, 0,
"limit upstream: request[%p] is resumed", ctx->r);
ctx->r->read_event_handler = wnode->read_event_handler;
ctx->r->write_event_handler = wnode->write_event_handler;
ngx_del_timer(ctx->r->connection->read);
if (wnode->r_timer_set) {
if (ctx->r->connection->read->timedout) {
ctx->r->read_event_handler(ctx->r);
return;
}
if (ngx_handle_read_event(ctx->r->connection->read, 0)
!= NGX_OK)
{
ngx_http_finalize_request(ctx->r,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_add_timer(ctx->r->connection->read,
ctx->r->connection->read->timer.key);
}
ngx_del_timer(ctx->r->connection->write);
if (wnode->w_timer_set) {
if (ctx->r->connection->write->timedout) {
ctx->r->write_event_handler(ctx->r);
return;
}
if (ngx_handle_write_event(ctx->r->connection->write, 0)
!= NGX_OK)
{
ngx_http_finalize_request(ctx->r,
NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_add_timer(ctx->r->connection->write,
ctx->r->connection->write->timer.key);
}
lnode->work++;
ngx_http_upstream_connect(ctx->r, ctx->r->upstream);
} while ((ngx_uint_t) ngx_atomic_fetch_add(&snode->counter, 1)
< ctx->lucf->limit_conn && lnode->qlen);
snode->counter--;
}
static void
ngx_http_limit_upstream_free_peer(ngx_peer_connection_t *pc, void *data,
ngx_uint_t state)
{
ngx_http_limit_upstream_ctx_t *ctx;
ctx = (ngx_http_limit_upstream_ctx_t *) data;
ctx->free(pc, ctx->data, state);
}
static ngx_int_t
ngx_http_limit_upstream_get_peer(ngx_peer_connection_t *pc, void *data)
{
size_t n;
ngx_int_t rc;
#if (NGX_DEBUG)
ngx_uint_t active;
#endif
ngx_slab_pool_t *shpool;
ngx_rbtree_node_t *node_s, *node_l;
struct sockaddr_in *sin;
ngx_http_cleanup_t *cln;
ngx_http_upstream_t *u;
ngx_http_limit_upstream_ctx_t *ctx;
ngx_http_limit_upstream_loc_t *lnode;
ngx_http_limit_upstream_shm_t *snode;
ngx_http_limit_upstream_node_t *cnode;
ngx_http_limit_upstream_wait_t *wnode;
ngx_http_limit_upstream_zone_t *shmctx;
ngx_rbtree_key_int_t t;
ctx = (ngx_http_limit_upstream_ctx_t *) data;
shpool = (ngx_slab_pool_t *) ctx->lucf->shm_zone->shm.addr;
shmctx = ctx->lucf->shm_zone->data;
if (ctx->r->upstream->blocked) {
rc = NGX_OK;
ctx->r->upstream->blocked = 0;
goto set_and_ret;
} else {
if (ctx->in_proc) {
sin = (struct sockaddr_in *) ctx->sockaddr;
node_s = ngx_http_limit_upstream_rbtree_lookup(shmctx->rbtree,
sin->sin_addr.s_addr,
sin->sin_port);
node_l = ngx_http_limit_upstream_rbtree_lookup(
&ngx_http_limit_upstream_loc_rbtree,
sin->sin_addr.s_addr,
sin->sin_port);
if (node_l && node_s) {
cnode = (ngx_http_limit_upstream_node_t *) &node_s->color;
snode = (ngx_http_limit_upstream_shm_t *) &cnode->counter;
cnode = (ngx_http_limit_upstream_node_t *) &node_l->color;
lnode = (ngx_http_limit_upstream_loc_t *) &cnode->counter;
lnode->work--;
snode->counter--;
lnode->counter--;
}
ctx->in_proc = 0;
}
rc = ctx->get(pc, ctx->data);
if (rc != NGX_OK && rc != NGX_DONE) {
return rc;
}
}
ctx->sockaddr = ngx_palloc(ctx->r->pool, pc->socklen);
if (ctx->sockaddr == NULL) {
return NGX_ERROR;
}
ngx_memcpy(ctx->sockaddr, pc->sockaddr, pc->socklen);
sin = (struct sockaddr_in *) ctx->sockaddr;
node_s = ngx_http_limit_upstream_rbtree_lookup(shmctx->rbtree,
sin->sin_addr.s_addr,
sin->sin_port);
node_l = ngx_http_limit_upstream_rbtree_lookup(
&ngx_http_limit_upstream_loc_rbtree,
sin->sin_addr.s_addr,
sin->sin_port);
if (node_l == NULL) {
n = offsetof(ngx_rbtree_node_t, color)
+ offsetof(ngx_http_limit_upstream_node_t, counter)
+ sizeof(ngx_http_limit_upstream_loc_t);
node_l = ngx_pcalloc(ngx_cycle->pool, n);
if (node_l == NULL) {
return NGX_ERROR;
}
cnode = (ngx_http_limit_upstream_node_t *) &node_l->color;
lnode = (ngx_http_limit_upstream_loc_t *) &cnode->counter;
node_l->key = sin->sin_addr.s_addr;
cnode->port = sin->sin_port;
ngx_queue_init(&lnode->wait);
ngx_rbtree_insert(&ngx_http_limit_upstream_loc_rbtree, node_l);
} else {
cnode = (ngx_http_limit_upstream_node_t *) &node_l->color;
lnode = (ngx_http_limit_upstream_loc_t *) &cnode->counter;
}
if (node_s == NULL) {
ngx_shmtx_lock(&shpool->mutex);
n = offsetof(ngx_rbtree_node_t, color)
+ offsetof(ngx_http_limit_upstream_node_t, counter)
+ sizeof(ngx_http_limit_upstream_shm_t);
node_s = ngx_slab_alloc_locked(shpool, n);
if (node_s == NULL) {
return NGX_ERROR;
}
cnode = (ngx_http_limit_upstream_node_t *) &node_s->color;
snode = (ngx_http_limit_upstream_shm_t *) &cnode->counter;
node_s->key = sin->sin_addr.s_addr;
cnode->port = sin->sin_port;
ngx_queue_insert_head(shmctx->queue, &snode->queue);
ngx_rbtree_insert(shmctx->rbtree, node_s);
ngx_shmtx_unlock(&shpool->mutex);
} else {
cnode = (ngx_http_limit_upstream_node_t *) &node_s->color;
snode = (ngx_http_limit_upstream_shm_t *) &cnode->counter;
}
snode->last = ngx_current_msec;
if (rc == NGX_DONE) {
snode->counter++;
lnode->counter++;
lnode->work++;
goto set_and_ret;
}
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->r->connection->log, 0,
"limit upstream: status for %V "
"(counter: %d, active: %d, wait queue: %d)",
pc->name, snode->counter, lnode->work, lnode->qlen);
#if (NGX_DEBUG)
active = ngx_atomic_fetch_add(&snode->counter, 1);
if (active >= ctx->lucf->limit_conn && lnode->work) {
#else
if ((ngx_uint_t) ngx_atomic_fetch_add(&snode->counter, 1)
>= ctx->lucf->limit_conn && lnode->work)
{
#endif
snode->counter--;
if (lnode->qlen >= ctx->lucf->backlog) {
ngx_log_error(ctx->lucf->log_level, ctx->r->connection->log, 0,
"limit upstream: request[%p] is dropped", ctx->r);
return NGX_DECLINED;
}
wnode = ngx_pcalloc(ctx->r->pool,
sizeof(ngx_http_limit_upstream_wait_t));
if (wnode == NULL) {
return NGX_ERROR;
}
ngx_queue_insert_head(&lnode->wait, &wnode->queue);
lnode->qlen++;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->r->connection->log, 0,
"limit upstream: add queue node: %p", &wnode->queue);
ngx_log_error(ctx->lucf->log_level, ctx->r->connection->log, 0,
"limit upstream: request[%p] is blocked", ctx->r);
wnode->ctx = ctx;
ctx->wait = wnode;
ctx->lnode = lnode;
wnode->read_event_handler = ctx->r->read_event_handler;
wnode->r_timer_set = ctx->r->connection->read->timer_set;
ctx->r->read_event_handler = ngx_http_block_reading;
if (wnode->r_timer_set) {
ngx_del_timer(ctx->r->connection->read);
t = ctx->r->connection->read->timer.key;
t -= (ngx_rbtree_key_int_t) ngx_current_msec;
if (t > 0) {
ctx->r->connection->read->timer.key = t;
} else {
ctx->r->connection->read->timedout = 1;
}
}
wnode->write_event_handler = ctx->r->write_event_handler;
wnode->w_timer_set = ctx->r->connection->write->timer_set;
ctx->r->write_event_handler = ngx_http_limit_upstream_timeout;
if (wnode->w_timer_set) {
ngx_del_timer(ctx->r->connection->write);
t = ctx->r->connection->write->timer.key;
t -= (ngx_rbtree_key_int_t) ngx_current_msec;
if (t > 0) {
ctx->r->connection->write->timer.key = t;
} else {
ctx->r->connection->write->timedout = 1;
}
}
if (ctx->lucf->timeout == 0) {
u = ctx->r->upstream;
ngx_add_timer(ctx->r->connection->write, u->conf->read_timeout);
} else {
ngx_add_timer(ctx->r->connection->write, ctx->lucf->timeout);
}
ctx->r->upstream->blocked = 1;
return NGX_BLOCK;
}
#if (NGX_DEBUG)
if (active >= ctx->lucf->limit_conn) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ctx->r->connection->log, 0,
"limit upstream: force continue request");
}
#endif
lnode->counter++;
lnode->work++;
set_and_ret:
if (!ctx->cln) {
cln = ngx_http_cleanup_add(ctx->r, 0);
if (cln == NULL) {
return NGX_ERROR;
}
cln->handler = ngx_http_limit_upstream_cleanup;
cln->data = ctx;
ctx->cln = 1;
}
ctx->in_proc = 1;
return rc;
}
static ngx_int_t
ngx_http_limit_upstream_init_peer(ngx_http_request_t *r,
ngx_http_upstream_srv_conf_t *us)
{
ngx_int_t rc;
ngx_http_limit_upstream_ctx_t *ctx;
ngx_http_limit_upstream_conf_t *lucf;
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_limit_upstream_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
lucf = us->srv_conf[ngx_http_limit_upstream_module.ctx_index];
rc = lucf->init(r, us);
if (rc != NGX_OK) {
return rc;
}
ctx->data = r->upstream->peer.data;
r->upstream->peer.data = ctx;
ctx->get = r->upstream->peer.get;
r->upstream->peer.get = ngx_http_limit_upstream_get_peer;
ctx->free = r->upstream->peer.free;
r->upstream->peer.free = ngx_http_limit_upstream_free_peer;
#if (NGX_HTTP_SSL)
ctx->set_session = r->upstream->peer.set_session;
r->upstream->peer.set_session = ngx_http_limit_upstream_set_peer_session;
ctx->save_session = r->upstream->peer.save_session;
r->upstream->peer.save_session = ngx_http_limit_upstream_save_peer_session;
#endif
ctx->r = r;
ctx->lucf = lucf;
r->upstream->blocked = 0;
return NGX_OK;
}
static ngx_int_t
ngx_http_limit_upstream_init(ngx_conf_t *cf)
{
ngx_uint_t i;
ngx_http_limit_upstream_conf_t *lucf, *mlucf;
ngx_http_upstream_srv_conf_t **uscfp;
ngx_http_upstream_main_conf_t *umcf;
umcf = ngx_http_conf_get_module_main_conf(cf,
ngx_http_upstream_module);
mlucf = ngx_http_conf_get_module_srv_conf(cf,
ngx_http_limit_upstream_module);
uscfp = umcf->upstreams.elts;
ngx_rbtree_init(&ngx_http_limit_upstream_loc_rbtree,
&ngx_http_limit_upstream_sentinel,
ngx_http_limit_upstream_rbtree_insert_value);
for (i = 0; i < umcf->upstreams.nelts; i++) {
if (uscfp[i]->srv_conf) {
lucf = uscfp[i]->
srv_conf[ngx_http_limit_upstream_module.ctx_index];
if (lucf->limit_conn != NGX_CONF_UNSET_UINT && !lucf->hooked) {
lucf->init = uscfp[i]->peer.init;
uscfp[i]->peer.init = ngx_http_limit_upstream_init_peer;
if (lucf->backlog == NGX_CONF_UNSET_UINT) {
lucf->backlog = 1000;
}
if (lucf->timeout == NGX_CONF_UNSET_MSEC) {
lucf->timeout = 0;
}
if (ngx_http_limit_upstream_merge_srv_conf(cf, mlucf, lucf)
!= NGX_CONF_OK)
{
return NGX_ERROR;
}
}
}
}
return NGX_OK;
}
static void *
ngx_http_limit_upstream_create_srv_conf(ngx_conf_t *cf)
{
ngx_http_limit_upstream_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_upstream_conf_t));
if (conf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc();
*
* conf->init = NULL;
* conf->shm_zone = NULL;
* conf->hooked = 0;
*/
conf->limit_conn = NGX_CONF_UNSET_UINT;
conf->backlog = NGX_CONF_UNSET_UINT;
conf->timeout = NGX_CONF_UNSET_MSEC;
conf->log_level = NGX_CONF_UNSET_UINT;
return conf;
}
static char *
ngx_http_limit_upstream_merge_srv_conf(ngx_conf_t *cf, void *parent,
void *child)
{
ngx_http_limit_upstream_conf_t *conf = child;
ngx_http_limit_upstream_conf_t *prev = parent;
ngx_conf_merge_uint_value(conf->log_level,
prev->log_level, NGX_LOG_NOTICE);
return NGX_CONF_OK;
}
static char *
ngx_http_limit_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ssize_t n;
ngx_str_t *value;
ngx_shm_zone_t *shm_zone;
ngx_http_limit_upstream_zone_t *ctx;
value = cf->args->elts;
n = ngx_parse_size(&value[2]);
if (n == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid size of limit_upstream_zone \"%V\"",
&value[2]);
return NGX_CONF_ERROR;
}
if (n < (ngx_int_t) (8 * ngx_pagesize)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"limit_upstream_zone \"%V\" is too small",
&value[1]);
return NGX_CONF_ERROR;
}
shm_zone = ngx_shared_memory_add(cf, &value[1], n,
&ngx_http_limit_upstream_module);
if (shm_zone == NULL) {
return NGX_CONF_ERROR;
}
if (shm_zone->data) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"limit_upstream_zone \"%V\" is duplicate",
&value[1]);
return NGX_CONF_ERROR;
}
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_upstream_zone_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
shm_zone->data = ctx;
shm_zone->init = ngx_http_limit_upstream_init_zone;
return NGX_CONF_OK;
}
static char *
ngx_http_limit_upstream_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_str_t *value, s;
ngx_uint_t i;
ngx_http_upstream_srv_conf_t *uscf;
ngx_http_limit_upstream_conf_t *lucf = conf;
if (lucf->shm_zone) {
return "is duplicate";
}
uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
value = cf->args->elts;
for (i = 1; i < cf->args->nelts; i++) {
if (ngx_strncmp("zone=", value[i].data, 5) == 0) {
s.len = value[i].len - 5;
s.data = value[i].data + 5;
lucf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
&ngx_http_limit_upstream_module);
if (lucf->shm_zone == NULL) {
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp("limit=", value[i].data, 6) == 0) {
lucf->limit_conn = ngx_atoi(value[i].data + 6, value[i].len - 6);
if (lucf->limit_conn <= 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid limit \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp("backlog=", value[i].data, 8) == 0) {
lucf->backlog = ngx_atoi(value[i].data + 8, value[i].len - 8);
if (lucf->backlog <= 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid backlog \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp("nodelay", value[i].data, 7) == 0) {
lucf->backlog = 0;
continue;
}
if (ngx_strncmp("timeout=", value[i].data, 8) == 0) {
s.len = value[i].len - 8;
s.data = value[i].data + 8;
lucf->timeout = ngx_parse_time(&s, 0);
if (lucf->timeout == (ngx_msec_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid timeout \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp("instant_hook", value[i].data, 12) == 0) {
lucf->init = uscf->peer.init;
uscf->peer.init = ngx_http_limit_upstream_init_peer;
lucf->hooked = 1;
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (lucf->limit_conn == NGX_CONF_UNSET_UINT) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%V\" must have \"limit\" parameter",
&cmd->name);
return NGX_CONF_ERROR;
}
if (lucf->shm_zone == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%V\" must have \"zone\" parameter",
&cmd->name);
return NGX_CONF_ERROR;
}
if (lucf->hooked) {
if (lucf->backlog == NGX_CONF_UNSET_UINT) {
lucf->backlog = 1000;
}
if (lucf->timeout == NGX_CONF_UNSET_MSEC) {
lucf->timeout = 0;
}
if (lucf->log_level == NGX_CONF_UNSET_UINT) {
lucf->log_level = NGX_LOG_NOTICE;
}
}
return NGX_CONF_OK;
}
static void ngx_http_limit_upstream_zone_expire(ngx_shm_zone_t *shm_zone)
{
ngx_queue_t *q, *t;
ngx_msec_int_t ms;
ngx_slab_pool_t *shpool;
ngx_rbtree_node_t *node;
ngx_http_limit_upstream_shm_t *data;
ngx_http_limit_upstream_zone_t *ctx;
shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
ctx = shm_zone->data;
ngx_shmtx_lock(&shpool->mutex);
for (q = ngx_queue_head(ctx->queue), t = NULL;
q != ctx->queue;
q = t)
{
data = ngx_queue_data(q, ngx_http_limit_upstream_shm_t, queue);
ms = (ngx_msec_int_t) ngx_current_msec - data->last;
ms = ngx_abs(ms);
t = ngx_queue_next(q);
/* remove nodes not used for at least one hour */
if (ms >= 3600000) {
ngx_queue_remove(q);
node = (ngx_rbtree_node_t *) ((u_char *) data
- offsetof(ngx_http_limit_upstream_node_t, counter)
- offsetof(ngx_rbtree_node_t, color));