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ngx_stream_upstream_check_module.c
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ngx_stream_upstream_check_module.c
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#include <nginx.h>
#include "http_response_parser.h"
#include "ngx_stream_upstream_check_module.h"
/* ngx_spinlock is defined without a matching unlock primitive */
#define ngx_spinlock_unlock(lock) \
(void) ngx_atomic_cmp_set(lock, ngx_pid, 0)
static ngx_int_t ngx_stream_check_get_shm_name(ngx_str_t *shm_name,
ngx_pool_t *pool);
static ngx_int_t ngx_stream_upstream_check_get_shm_name(ngx_str_t *shm_name,
ngx_pool_t *pool, ngx_uint_t generation);
static char *ngx_stream_upstream_check_init_shm(ngx_conf_t *cf, void *conf);
static ngx_int_t ngx_stream_upstream_check_init_shm_zone(ngx_shm_zone_t *shm_zone,
void *data);
/*
static ngx_uint_t ngx_stream_upstream_check_add_dynamic_peer_shm(ngx_pool_t *pool,
ngx_stream_upstream_check_srv_conf_t *ucscf, ngx_addr_t *peer_addr);
static void ngx_stream_upstream_check_clear_dynamic_peer_shm(
ngx_stream_check_peer_shm_t *peer_shm);
*/
static ngx_int_t ngx_stream_check_init_process(ngx_cycle_t *cycle);
static void ngx_stream_check_peek_handler(ngx_event_t *event);
static void ngx_stream_check_send_handler(ngx_event_t *event);
static void ngx_stream_check_recv_handler(ngx_event_t *event);
static ngx_int_t ngx_stream_check_http_init(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_http_parse(ngx_stream_check_peer_conf_t *peer_conf);
static void ngx_stream_check_http_reinit(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_ssl_hello_init(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_ssl_hello_parse(ngx_stream_check_peer_conf_t *peer_conf);
static void ngx_stream_check_ssl_hello_reinit(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_mysql_init(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_mysql_parse(ngx_stream_check_peer_conf_t *peer_conf);
static void ngx_stream_check_mysql_reinit(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_pop3_init(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_pop3_parse(ngx_stream_check_peer_conf_t *peer_conf);
static void ngx_stream_check_pop3_reinit(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_imap_init(ngx_stream_check_peer_conf_t *peer_conf);
static ngx_int_t ngx_stream_check_imap_parse(ngx_stream_check_peer_conf_t *peer_conf);
static void ngx_stream_check_imap_reinit(ngx_stream_check_peer_conf_t *peer_conf);
static char *ngx_stream_upstream_check(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static check_conf_t *ngx_stream_get_check_type_conf(ngx_str_t *str);
static void *ngx_stream_upstream_check_create_main_conf(ngx_conf_t *cf);
static char *ngx_stream_upstream_check_init_main_conf(ngx_conf_t *cf, void *conf);
static void *ngx_stream_upstream_check_create_srv_conf(ngx_conf_t *cf);
static char *ngx_stream_upstream_check_init_srv_conf(ngx_conf_t *cf, void *conf);
static char * ngx_stream_upstream_check_status(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static ngx_conf_bitmask_t ngx_check_http_expect_alive_masks[] = {
{ ngx_string("http_2xx"), NGX_CHECK_HTTP_2XX },
{ ngx_string("http_3xx"), NGX_CHECK_HTTP_3XX },
{ ngx_string("http_4xx"), NGX_CHECK_HTTP_4XX },
{ ngx_string("http_5xx"), NGX_CHECK_HTTP_5XX },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_stream_upstream_check_commands[] = {
{ ngx_string("check"),
NGX_STREAM_UPS_CONF|NGX_CONF_1MORE,
ngx_stream_upstream_check,
NGX_STREAM_SRV_CONF_OFFSET,
0,
NULL },
{ ngx_string("check_http_send"),
NGX_STREAM_UPS_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_STREAM_SRV_CONF_OFFSET,
offsetof(ngx_stream_upstream_check_srv_conf_t, send),
NULL },
{ ngx_string("check_http_expect_alive"),
NGX_STREAM_UPS_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_STREAM_SRV_CONF_OFFSET,
offsetof(ngx_stream_upstream_check_srv_conf_t, code.status_alive),
&ngx_check_http_expect_alive_masks },
{ ngx_string("check_shm_size"),
NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_STREAM_MAIN_CONF_OFFSET,
offsetof(ngx_stream_upstream_check_main_conf_t, check_shm_size),
NULL },
{ ngx_string("stream_check_status"),
NGX_STREAM_SRV_CONF|NGX_CONF_NOARGS,
ngx_stream_upstream_check_status,
0,
0,
NULL },
ngx_null_command
};
static ngx_stream_module_t ngx_stream_upstream_check_module_ctx = {
NULL, /* postconfiguration */
ngx_stream_upstream_check_create_main_conf, /* create main configuration */
ngx_stream_upstream_check_init_main_conf, /* init main configuration */
ngx_stream_upstream_check_create_srv_conf, /* create server configuration */
NULL, /* merge server configuration */
};
ngx_module_t ngx_stream_upstream_check_module = {
NGX_MODULE_V1,
&ngx_stream_upstream_check_module_ctx, /* module context */
ngx_stream_upstream_check_commands, /* module directives */
NGX_STREAM_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
ngx_stream_check_init_process, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
#define RANDOM "NGX_STREAM_CHECK_SSL_HELLO\n\n\n\n\n"
/* This is the SSLv3 CLIENT HELLO packet used in conjunction with the
* check type of ssl_hello to ensure that the remote server speaks SSL.
*
* Check RFC 2246 (TLSv1.0) sections A.3 and A.4 for details.
*
* Some codes copy from HAProxy 1.4.1
*/
static const char sslv3_client_hello_pkt[] = {
"\x16" /* ContentType : 0x16 = Hanshake */
"\x03\x00" /* ProtocolVersion : 0x0300 = SSLv3 */
"\x00\x79" /* ContentLength : 0x79 bytes after this one */
"\x01" /* HanshakeType : 0x01 = CLIENT HELLO */
"\x00\x00\x75" /* HandshakeLength : 0x75 bytes after this one */
"\x03\x00" /* Hello Version : 0x0300 = v3 */
"\x00\x00\x00\x00" /* Unix GMT Time (s) : filled with <now> (@0x0B) */
RANDOM /* Random : must be exactly 28 bytes */
"\x00" /* Session ID length : empty (no session ID) */
"\x00\x4E" /* Cipher Suite Length : 78 bytes after this one */
"\x00\x01" "\x00\x02" "\x00\x03" "\x00\x04" /* 39 most common ciphers : */
"\x00\x05" "\x00\x06" "\x00\x07" "\x00\x08" /* 0x01...0x1B, 0x2F...0x3A */
"\x00\x09" "\x00\x0A" "\x00\x0B" "\x00\x0C" /* This covers RSA/DH, */
"\x00\x0D" "\x00\x0E" "\x00\x0F" "\x00\x10" /* various bit lengths, */
"\x00\x11" "\x00\x12" "\x00\x13" "\x00\x14" /* SHA1/MD5, DES/3DES/AES... */
"\x00\x15" "\x00\x16" "\x00\x17" "\x00\x18"
"\x00\x19" "\x00\x1A" "\x00\x1B" "\x00\x2F"
"\x00\x30" "\x00\x31" "\x00\x32" "\x00\x33"
"\x00\x34" "\x00\x35" "\x00\x36" "\x00\x37"
"\x00\x38" "\x00\x39" "\x00\x3A"
"\x01" /* Compression Length : 0x01 = 1 byte for types */
"\x00" /* Compression Type : 0x00 = NULL compression */
};
#define HANDSHAKE 0x16
#define SERVER_HELLO 0x02
static check_conf_t ngx_check_types[] = {
{ NGX_STREAM_CHECK_TCP,
"tcp",
ngx_null_string,
0,
ngx_stream_check_peek_handler,
ngx_stream_check_peek_handler,
NULL,
NULL,
NULL,
0 },
{ NGX_STREAM_CHECK_HTTP,
"http",
ngx_string("GET / HTTP/1.0\r\n\r\n"),
NGX_CONF_BITMASK_SET | NGX_CHECK_HTTP_2XX | NGX_CHECK_HTTP_3XX,
ngx_stream_check_send_handler,
ngx_stream_check_recv_handler,
ngx_stream_check_http_init,
ngx_stream_check_http_parse,
ngx_stream_check_http_reinit,
1 },
{ NGX_STREAM_CHECK_SSL_HELLO,
"ssl_hello",
ngx_string(sslv3_client_hello_pkt),
0,
ngx_stream_check_send_handler,
ngx_stream_check_recv_handler,
ngx_stream_check_ssl_hello_init,
ngx_stream_check_ssl_hello_parse,
ngx_stream_check_ssl_hello_reinit,
1 },
{ NGX_STREAM_CHECK_MYSQL,
"mysql",
ngx_null_string,
0,
ngx_stream_check_send_handler,
ngx_stream_check_recv_handler,
ngx_stream_check_mysql_init,
ngx_stream_check_mysql_parse,
ngx_stream_check_mysql_reinit,
1 },
{ NGX_STREAM_CHECK_POP3,
"pop3",
ngx_null_string,
0,
ngx_stream_check_send_handler,
ngx_stream_check_recv_handler,
ngx_stream_check_pop3_init,
ngx_stream_check_pop3_parse,
ngx_stream_check_pop3_reinit,
1 },
{ NGX_STREAM_CHECK_IMAP,
"imap",
ngx_null_string,
0,
ngx_stream_check_send_handler,
ngx_stream_check_recv_handler,
ngx_stream_check_imap_init,
ngx_stream_check_imap_parse,
ngx_stream_check_imap_reinit,
1 },
{0, "", ngx_null_string, 0, NULL, NULL, NULL, NULL, NULL, 0}
};
static ngx_uint_t ngx_stream_check_shm_generation = 0;
static ngx_stream_check_peers_conf_t *check_peers_ctx = NULL;
static char *
ngx_stream_upstream_check(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_stream_upstream_check_srv_conf_t *ucscf = conf;
ngx_str_t *value, s;
ngx_uint_t i, rise, fall;
ngx_msec_t interval, timeout;
/*set default*/
rise = 2;
fall = 5;
interval = 30000;
timeout = 1000;
value = cf->args->elts;
for (i = 1; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "type=", 5) == 0) {
s.len = value[i].len - 5;
s.data = value[i].data + 5;
ucscf->check_type_conf = ngx_stream_get_check_type_conf(&s);
if ( ucscf->check_type_conf == NULL) {
goto invalid_check_parameter;
}
continue;
}
if (ngx_strncmp(value[i].data, "interval=", 9) == 0) {
s.len = value[i].len - 9;
s.data = value[i].data + 9;
interval = ngx_atoi(s.data, s.len);
if (interval == (ngx_msec_t) NGX_ERROR) {
goto invalid_check_parameter;
}
continue;
}
if (ngx_strncmp(value[i].data, "timeout=", 8) == 0) {
s.len = value[i].len - 8;
s.data = value[i].data + 8;
timeout = ngx_atoi(s.data, s.len);
if (timeout == (ngx_msec_t) NGX_ERROR) {
goto invalid_check_parameter;
}
continue;
}
if (ngx_strncmp(value[i].data, "rise=", 5) == 0) {
s.len = value[i].len - 5;
s.data = value[i].data + 5;
rise = ngx_atoi(s.data, s.len);
if (rise == (ngx_uint_t) NGX_ERROR) {
goto invalid_check_parameter;
}
continue;
}
if (ngx_strncmp(value[i].data, "fall=", 5) == 0) {
s.len = value[i].len - 5;
s.data = value[i].data + 5;
fall = ngx_atoi(s.data, s.len);
if (fall == (ngx_uint_t) NGX_ERROR) {
goto invalid_check_parameter;
}
continue;
}
goto invalid_check_parameter;
}
ucscf->check_interval = interval;
ucscf->check_timeout = timeout;
ucscf->fall_count = fall;
ucscf->rise_count = rise;
if (ucscf->check_type_conf == NULL) {
s.len = sizeof("tcp") - 1;
s.data =(u_char *) "tcp";
ucscf->check_type_conf = ngx_stream_get_check_type_conf(&s);
}
return NGX_CONF_OK;
invalid_check_parameter:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
check_conf_t *
ngx_stream_get_check_type_conf(ngx_str_t *str)
{
ngx_uint_t i;
for (i = 0; ;i++) {
if (ngx_check_types[i].type == 0) {
break;
}
if (ngx_strncmp(str->data, (u_char *)ngx_check_types[i].name,
str->len) == 0) {
return &ngx_check_types[i];
}
}
return NULL;
}
ngx_uint_t
ngx_stream_check_add_peer(ngx_conf_t *cf, ngx_stream_upstream_srv_conf_t *uscf,
ngx_addr_t *peer)
{
ngx_stream_check_peer_conf_t *peer_conf;
ngx_stream_check_peers_conf_t *peers_conf;
ngx_stream_upstream_check_srv_conf_t *ucscf;
ngx_stream_upstream_check_main_conf_t *ucmcf;
if (uscf->srv_conf == NULL) {
return NGX_ERROR;
}
ucscf = ngx_stream_conf_upstream_srv_conf(uscf,
ngx_stream_upstream_check_module);
ucmcf = ngx_stream_conf_get_module_main_conf(cf,
ngx_stream_upstream_check_module);
if(ucscf->send.len == 0) {
return NGX_ERROR;
}
peers_conf = ucmcf->peers_conf;
peer_conf = ngx_array_push(&peers_conf->peers);
if (peer_conf == NULL) {
return NGX_ERROR;
}
ngx_memzero(peer_conf, sizeof(ngx_stream_check_peer_conf_t));
peer_conf->index = peers_conf->peers.nelts - 1;
peer_conf->conf = ucscf;
peer_conf->peer = peer;
return peer_conf->index;
}
/*
ngx_uint_t
ngx_stream_upstream_check_add_dynamic_peer(ngx_pool_t *pool,
ngx_stream_upstream_srv_conf_t *us, ngx_addr_t *peer_addr)
{
void *elts;
ngx_uint_t i, index;
ngx_stream_check_peer_shm_t *peer_shm;
ngx_stream_check_peers_shm_t *peers_shm;
ngx_stream_check_peer_conf_t *peer, *p, *np;
ngx_stream_check_peers_conf_t *peers;
ngx_stream_upstream_check_srv_conf_t *ucscf;
ngx_stream_upstream_check_main_conf_t *ucmcf;
if (check_peers_ctx == NULL || us->srv_conf == NULL) {
return NGX_ERROR;
}
ucscf = ngx_stream_conf_upstream_srv_conf(us, ngx_stream_upstream_check_module);
if(ucscf->check_interval == 0) {
return NGX_ERROR;
}
index = ngx_stream_upstream_check_add_dynamic_peer_shm(pool,
ucscf, peer_addr);
if (index == (ngx_uint_t) NGX_ERROR) {
return index;
}
peers_shm = check_peers_ctx->peers_shm;
peer_shm = peers_shm->peers;
ucmcf = ngx_stream_cycle_get_module_main_conf(ngx_cycle,
ngx_stream_upstream_check_module);
peers = ucmcf->peers;
peer = NULL;
p = peers->peers.elts;
ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pool->log, 0,
"stream upstream check add dynamic upstream: %p, n: %ui",
p, peers->peers.nelts);
for (i = 0; i < peers->peers.nelts; i++) {
ngx_log_debug3(NGX_LOG_DEBUG_STREAM, pool->log, 0,
"stream upstream check add [%ui], index=%ui, delete:%ud",
i, p[i].index, p[i].delete);
if (p[i].delete) {
p[i].delete = 0;
peer = &p[i];
break;
}
}
if (peer == NULL) {
elts = peers->peers.elts;
peer = ngx_array_push(&peers->peers);
if (peer == NULL) {
return NGX_ERROR;
}
if (elts != peers->peers.elts) {
ngx_log_error(NGX_LOG_INFO, pool->log, 0,
"stream upstream check add peer realloc memory");
// reset all upstream peers' timers
p = elts;
np = peers->peers.elts;
for (i = 0; i < peers->peers.nelts - 1; i++) {
if (p[i].delete) {
continue;
}
ngx_log_error(NGX_LOG_INFO, pool->log, 0,
"old peer: %p, new peer: %p,"
"old timer: %p, new timer: %p",
np[i].check_ev.data, &np[i],
&p[i].check_ev, &np[i].check_ev);
ngx_stream_upstream_check_clear_peer(&p[i]);
ngx_memzero(&np[i].pc, sizeof(ngx_peer_connection_t));
np[i].check_data = NULL;
np[i].pool = NULL;
ngx_stream_upstream_check_add_timer(&np[i],
np[i].conf->check_type_conf,
0, pool->log);
}
}
}
ngx_memzero(peer, sizeof(ngx_stream_upstream_check_peer_t));
peer->conf = ucscf;
peer->index = index;
// peer->upstream_name = &us->host; TODO:
peer->peer = peer_addr;
ngx_log_debug3(NGX_LOG_DEBUG_STREAM, pool->log, 0,
"stream upstream check add dynamic upstream: %V, "
"peer: %V, index: %ui",
&us->host, &peer_addr->name, index);
peer->check_peer_addr = peer->peer_addr;
peer->shm = &peer_shm[index];
ngx_stream_upstream_check_add_timer(peer, ucscf->check_type_conf,
0, pool->log);
ngx_log_debug3(NGX_LOG_DEBUG_STREAM, pool->log, 0,
"stream upstream check add peer: %p, index: %ui",
peer, peer->index);
// peers->checksum +=
// ngx_murmur_hash2(peer_addr->name.data, peer_addr->name.len);
return peer->index;
}
void
ngx_stream_upstream_check_delete_dynamic_peer(ngx_str_t *name,
ngx_addr_t *peer_addr)
{
ngx_uint_t i;
ngx_stream_check_peer_conf_t *peer, *chosen;
ngx_stream_check_peers_conf_t *peers;
chosen = NULL;
peers = check_peers_ctx;
peer = peers->peers.elts;
ngx_log_debug2(NGX_LOG_DEBUG_STREAM, ngx_cycle->log, 0,
"stream upstream check delete dynamic upstream: %p, n: %ui",
peer, peers->peers.nelts);
ngx_log_debug2(NGX_LOG_DEBUG_STREAM, ngx_cycle->log, 0,
"stream upstream check delete dynamic upstream: %V, "
"peer: %V", name, &peer_addr->name);
for (i = 0; i < peers->peers.nelts; i++) {
if (peer[i].delete) {
continue;
}
ngx_log_debug3(NGX_LOG_DEBUG_STREAM, ngx_cycle->log, 0,
"stream upstream check delete [%ui], index=%ui, addr:%V",
i, peer[i].index, &peer[i].peer->name);
TODO:
// if (peer[i].upstream_name->len != name->len
// || ngx_strncmp(peer[i].upstream_name->data,
// name->data, name->len) != 0) {
// continue;
// }
if (peer[i].peer->socklen != peer_addr->socklen
|| ngx_memcmp(peer[i].peer->sockaddr, peer_addr->sockaddr,
peer_addr->socklen) != 0) {
continue;
}
chosen = &peer[i];
break;
}
if (chosen == NULL) {
return;
}
ngx_log_debug3(NGX_LOG_DEBUG_STREAM, ngx_cycle->log, 0,
"stream upstream check delete peer: %p, index: %ui"
chosen, chosen->index);
ngx_shmtx_lock(&chosen->shm->mutex);
if (chosen->shm->owner == ngx_pid) {
chosen->shm->owner = NGX_INVALID_PID;
}
TODO:
if (chosen->shm->ref <= 0 && chosen->shm->delete != PEER_DELETED) {
ngx_stream_upstream_check_clear_dynamic_peer_shm(chosen->shm);
chosen->shm->delete = PEER_DELETED;
}
ngx_shmtx_unlock(&chosen->shm->mutex);
ngx_stream_upstream_check_clear_peer(chosen);
}
static ngx_uint_t
ngx_stream_upstream_check_add_dynamic_peer_shm(ngx_pool_t *pool,
ngx_stream_upstream_check_srv_conf_t *ucscf, ngx_addr_t *peer_addr)
{
ngx_int_t rc;
ngx_uint_t i, index;
ngx_slab_pool_t *shpool;
ngx_stream_check_peer_shm_t *peer_shm;
ngx_stream_check_peers_shm_t *peers_shm;
if (check_peers_ctx == NULL) {
return NGX_ERROR;
}
shpool = check_peers_ctx->shpool;
peers_shm = check_peers_ctx->peers_shm;
peer_shm = peers_shm->peers;
index = NGX_ERROR;
ngx_shmtx_lock(&shpool->mutex);
for (i = 0; i < peers_shm->number; i++) {
// TODO: lock the peer mutex
if (peer_shm[i].delete == PEER_DELETED) {
continue;
}
// TODO: check the peer configure
// Merge the duplicate peer
// check the peer configure by check_type and check_send
if (peer_addr->socklen == peer_shm[i].socklen &&
ngx_memcmp(peer_addr->sockaddr, peer_shm[i].sockaddr,
peer_addr->socklen) == 0
&& peer_shm[i].checksum
== ngx_murmur_hash2(ucscf->send.data, ucscf->send.len))
{
ngx_shmtx_unlock(&shpool->mutex);
return i;
}
}
for (i = 0; i < peers_shm->number; i++) {
if (peer_shm[i].delete == PEER_DELETED) {
peer_shm[i].delete = PEER_NORMAL;
index = i;
break;
}
}
if (index == (ngx_uint_t) NGX_ERROR) {
if (peers_shm->number >= peers_shm->max_number) {
goto fail;
}
index = peers_shm->number++;
}
ngx_memzero(&peer_shm[index], sizeof(ngx_stream_check_peer_shm_t));
peer_shm[index].socklen = peer_addr->socklen;
peer_shm[index].sockaddr = ngx_slab_alloc_locked(shpool,
peer_shm->socklen);
if (peer_shm[index].sockaddr == NULL) {
goto fail;
}
ngx_memcpy(peer_shm[index].sockaddr, peer_addr->sockaddr,
peer_addr->socklen);
TODO:
rc = ngx_stream_upstream_check_init_shm_peer(&peer_shm[index], NULL,
ucscf->default_down, pool,
&peer_addr->name);
if (rc != NGX_OK) {
goto fail;
}
// Set tag to peer_shm
// peer_shm[index].checksum = ngx_murmur_hash2(ucscf->send.data, ucscf->send.len);
ngx_shmtx_unlock(&shpool->mutex);
return index;
fail:
ngx_shmtx_unlock(&shpool->mutex);
return NGX_ERROR;
}
static void
ngx_stream_upstream_check_clear_dynamic_peer_shm(
ngx_stream_check_peer_shm_t *peer_shm)
{
if (check_peers_ctx == NULL) {
return;
}
ngx_slab_free_locked(check_peers_ctx->shpool, peer_shm->sockaddr);
}
*/
ngx_uint_t
ngx_stream_check_peer_down(ngx_uint_t index)
{
ngx_stream_check_peer_conf_t *peer_conf;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return 0;
}
peer_conf = check_peers_ctx->peers.elts;
return (peer_conf[index].shm->down);
}
void
ngx_stream_check_get_peer(ngx_uint_t index)
{
ngx_stream_check_peer_conf_t *peer_conf;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return;
}
peer_conf = check_peers_ctx->peers.elts;
ngx_spinlock(&peer_conf[index].shm->lock, ngx_pid, 1024);
peer_conf[index].shm->access_count++;
ngx_spinlock_unlock(&peer_conf[index].shm->lock);
}
void
ngx_stream_check_free_peer(ngx_uint_t index)
{
ngx_stream_check_peer_conf_t *peer_conf;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return;
}
peer_conf = check_peers_ctx->peers.elts;
ngx_spinlock(&peer_conf[index].shm->lock, ngx_pid, 1024);
ngx_spinlock_unlock(&peer_conf[index].shm->lock);
}
#define SHM_NAME_LEN 256
static ngx_int_t
ngx_stream_check_get_shm_name(ngx_str_t *shm_name, ngx_pool_t *pool)
{
u_char *last;
shm_name->data = ngx_palloc(pool, SHM_NAME_LEN);
if (shm_name->data == NULL) {
return NGX_ERROR;
}
last = ngx_snprintf(shm_name->data, SHM_NAME_LEN, "%s#%ui",
"ngx_stream_upstream_check_module", ngx_stream_check_shm_generation);
shm_name->len = last - shm_name->data;
return NGX_OK;
}
static ngx_shm_zone_t *
ngx_shared_memory_find(ngx_cycle_t *cycle, ngx_str_t *name, void *tag)
{
ngx_uint_t i;
ngx_shm_zone_t *shm_zone;
ngx_list_part_t *part;
part = (ngx_list_part_t *) & (cycle->shared_memory.part);
shm_zone = part->elts;
for (i = 0; /* void */ ; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
shm_zone = part->elts;
i = 0;
}
if (name->len != shm_zone[i].shm.name.len) {
continue;
}
if (ngx_strncmp(name->data, shm_zone[i].shm.name.data, name->len)
!= 0)
{
continue;
}
if (tag != shm_zone[i].tag) {
continue;
}
return &shm_zone[i];
}
return NULL;
}
static void
ngx_stream_check_clean_event(ngx_stream_check_peer_conf_t *peer_conf)
{
ngx_connection_t *c;
c = peer_conf->pc.connection;
ngx_log_debug2(NGX_LOG_DEBUG_TCP, c->log, 0,
"tcp check clean event: index:%d, fd: %d",
peer_conf->index, c->fd);
ngx_close_connection(c);
if (peer_conf->check_timeout_ev.timer_set) {
ngx_del_timer(&peer_conf->check_timeout_ev);
}
peer_conf->state = NGX_STREAM_CHECK_ALL_DONE;
if (peer_conf->check_data != NULL && peer_conf->reinit) {
peer_conf->reinit(peer_conf);
}
ngx_spinlock(&peer_conf->shm->lock, ngx_pid, 1024);
peer_conf->shm->owner = NGX_INVALID_PID;
ngx_spinlock_unlock(&peer_conf->shm->lock);
}
static void
ngx_stream_check_clear_all_events()
{
ngx_uint_t i;
static ngx_flag_t has_cleared = 0;
ngx_stream_check_peer_shm_t *peer_shm;
ngx_stream_check_peers_shm_t *peers_shm;
ngx_stream_check_peer_conf_t *peer_conf;
ngx_stream_check_peers_conf_t *peers_conf;
if (has_cleared || check_peers_ctx == NULL) {
return;
}
has_cleared = 1;
peers_conf = check_peers_ctx;
peers_shm = peers_conf->peers_shm;
peer_conf = peers_conf->peers.elts;
peer_shm = peers_shm->peers;
for (i = 0; i < peers_conf->peers.nelts; i++) {
if (peer_conf[i].check_ev.timer_set) {
ngx_del_timer(&peer_conf[i].check_ev);
}
if (peer_shm[i].owner == ngx_pid) {
ngx_stream_check_clean_event(&peer_conf[i]);
}
if (peer_conf[i].pool != NULL) {
ngx_destroy_pool(peer_conf[i].pool);
}
}
}
static ngx_int_t
ngx_stream_check_need_exit()
{
if (ngx_terminate || ngx_exiting || ngx_quit) {
ngx_stream_check_clear_all_events();
return 1;
}
return 0;
}
static void
ngx_stream_check_finish_handler(ngx_event_t *event)
{
if (ngx_stream_check_need_exit()) {
return;
}
}
static void
ngx_stream_check_status_update(ngx_stream_check_peer_conf_t *peer_conf,
ngx_int_t result)
{
ngx_stream_upstream_check_srv_conf_t *ucscf;
ucscf = peer_conf->conf;
if (result) {
peer_conf->shm->rise_count++;
peer_conf->shm->fall_count = 0;
if (peer_conf->shm->down
&& (peer_conf->shm->rise_count >= ucscf->rise_count)) {
peer_conf->shm->down = 0;
}
} else {
peer_conf->shm->rise_count = 0;
peer_conf->shm->fall_count++;
if (!peer_conf->shm->down
&& (peer_conf->shm->fall_count >= ucscf->fall_count)) {
peer_conf->shm->down = 1;
}
}
peer_conf->shm->access_time = ngx_current_msec;
}
static void
ngx_stream_check_timeout_handler(ngx_event_t *event)
{
ngx_stream_check_peer_conf_t *peer_conf;
if (ngx_stream_check_need_exit()) {
return;
}
peer_conf = event->data;
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"check time out with peer: %V ", &peer_conf->peer->name);
ngx_stream_check_status_update(peer_conf, 0);
ngx_stream_check_clean_event(peer_conf);
}
static void
ngx_stream_check_peek_handler(ngx_event_t *event)
{
char buf[1];
ngx_int_t n;
ngx_err_t err;
ngx_connection_t *c;
ngx_stream_check_peer_conf_t *peer_conf;
if (ngx_stream_check_need_exit()) {
return;
}
c = event->data;
peer_conf = c->data;
n = recv(c->fd, buf, 1, MSG_PEEK);
err = ngx_socket_errno;
ngx_log_debug2(NGX_LOG_DEBUG_TCP, c->log, err,
"tcp check upstream recv(): %d, fd: %d",
n, c->fd);
if (n >= 0 || err == NGX_EAGAIN) {
ngx_stream_check_status_update(peer_conf, 1);
} else {
c->error = 1;
ngx_stream_check_status_update(peer_conf, 0);
}
ngx_stream_check_clean_event(peer_conf);