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ngx_stream_upstream_check_module.c
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/*
* Copyright (C) 2017- Changxun Zhou([email protected])
*/
#include <nginx.h>
#include <ngx_core.h>
#include <ngx_stream.h>
#include <ngx_http.h>
#include "ngx_stream_upstream_check_module.h"
typedef struct ngx_stream_upstream_check_peer_s ngx_stream_upstream_check_peer_t;
typedef struct ngx_stream_upstream_check_srv_conf_s
ngx_stream_upstream_check_srv_conf_t;
typedef struct {
ngx_buf_t send;
ngx_buf_t recv;
ngx_uint_t state;
ngx_http_status_t status;
size_t padding;
size_t length;
} ngx_stream_upstream_check_ctx_t;
typedef struct {
ngx_shmtx_t mutex;
#if (nginx_version >= 1002000)
ngx_shmtx_sh_t lock;
#else
ngx_atomic_t lock;
#endif
ngx_pid_t owner;
ngx_msec_t access_time;
ngx_uint_t fall_count;
ngx_uint_t rise_count;
ngx_uint_t busyness;
ngx_uint_t access_count;
struct sockaddr *sockaddr;
socklen_t socklen;
ngx_atomic_t down;
ngx_str_t *upstream_name;
u_char padding[64];
} ngx_stream_upstream_check_peer_shm_t;
typedef struct {
ngx_uint_t generation;
ngx_uint_t checksum;//zhoucx: we can know if peer config file changed by calculate it.
ngx_uint_t number;
/* ngx_stream_upstream_check_status_peer_t */
ngx_stream_upstream_check_peer_shm_t peers[1];
} ngx_stream_upstream_check_peers_shm_t;
#define NGX_HTTP_CHECK_CONNECT_DONE 0x0001
#define NGX_HTTP_CHECK_SEND_DONE 0x0002
#define NGX_HTTP_CHECK_RECV_DONE 0x0004
#define NGX_HTTP_CHECK_ALL_DONE 0x0008
typedef ngx_int_t (*ngx_stream_upstream_check_packet_init_pt)
(ngx_stream_upstream_check_peer_t *peer);
typedef ngx_int_t (*ngx_stream_upstream_check_packet_parse_pt)
(ngx_stream_upstream_check_peer_t *peer);
typedef void (*ngx_stream_upstream_check_packet_clean_pt)
(ngx_stream_upstream_check_peer_t *peer);
struct ngx_stream_upstream_check_peer_s {
ngx_flag_t state;
ngx_pool_t *pool;
ngx_uint_t index;
ngx_uint_t max_busy;
ngx_str_t *upstream_name;
ngx_addr_t *check_peer_addr;
ngx_addr_t *peer_addr;
ngx_event_t check_ev;
ngx_event_t check_timeout_ev;
ngx_peer_connection_t pc;
void *check_data;
ngx_event_handler_pt send_handler;
ngx_event_handler_pt recv_handler;
ngx_stream_upstream_check_packet_init_pt init; //zhoucx: function ptr
ngx_stream_upstream_check_packet_parse_pt parse;
ngx_stream_upstream_check_packet_clean_pt reinit;
ngx_stream_upstream_check_peer_shm_t *shm;
ngx_stream_upstream_check_srv_conf_t *conf;
};
typedef struct {
ngx_str_t check_shm_name;
ngx_uint_t checksum;
ngx_array_t peers;
ngx_stream_upstream_check_peers_shm_t *peers_shm;
} ngx_stream_upstream_check_peers_t;
#define NGX_HTTP_CHECK_TCP 0x0001
#define NGX_HTTP_CHECK_HTTP 0x0002
#define NGX_HTTP_CHECK_UDP 0x0004
#define NGX_CHECK_HTTP_2XX 0x0002
#define NGX_CHECK_HTTP_3XX 0x0004
#define NGX_CHECK_HTTP_4XX 0x0008
#define NGX_CHECK_HTTP_5XX 0x0010
#define NGX_CHECK_HTTP_ERR 0x8000
typedef struct {
ngx_uint_t type;
ngx_str_t name;
ngx_str_t default_send;
/* HTTP */
ngx_uint_t default_status_alive;
ngx_event_handler_pt send_handler;
ngx_event_handler_pt recv_handler;
ngx_stream_upstream_check_packet_init_pt init;
ngx_stream_upstream_check_packet_parse_pt parse;
ngx_stream_upstream_check_packet_clean_pt reinit;
unsigned need_pool;
unsigned need_keepalive;
} ngx_check_conf_t;
typedef void (*ngx_stream_upstream_check_status_format_pt) (ngx_buf_t *b,
ngx_stream_upstream_check_peers_t *peers, ngx_uint_t flag);
typedef struct {
ngx_str_t format;
ngx_str_t content_type;
ngx_stream_upstream_check_status_format_pt output;
} ngx_check_status_conf_t;
#define NGX_CHECK_STATUS_DOWN 0x0001
#define NGX_CHECK_STATUS_UP 0x0002
typedef struct {
ngx_check_status_conf_t *format;
ngx_flag_t flag;
} ngx_stream_upstream_check_status_ctx_t;
typedef ngx_int_t (*ngx_stream_upstream_check_status_command_pt)
(ngx_stream_upstream_check_status_ctx_t *ctx, ngx_str_t *value);
typedef struct {
ngx_str_t name;
ngx_stream_upstream_check_status_command_pt handler;
} ngx_check_status_command_t;
//zhocux stream check module main config data.
typedef struct {
ngx_uint_t check_shm_size;
ngx_stream_upstream_check_peers_t *peers;
} ngx_stream_upstream_check_main_conf_t;
struct ngx_stream_upstream_check_srv_conf_s {
ngx_uint_t port;
ngx_uint_t fall_count;
ngx_uint_t rise_count;
ngx_msec_t check_interval;
ngx_msec_t check_timeout;
ngx_uint_t check_keepalive_requests;
ngx_check_conf_t *check_type_conf;
ngx_str_t send;
union {
ngx_uint_t return_code;
ngx_uint_t status_alive;
} code;
ngx_uint_t default_down;
};
typedef struct {
ngx_check_status_conf_t *format;
} ngx_stream_upstream_check_loc_conf_t;
static ngx_int_t ngx_stream_upstream_check_add_timers(ngx_cycle_t *cycle);
static ngx_int_t ngx_stream_upstream_check_peek_one_byte(ngx_connection_t *c);
static void ngx_stream_upstream_check_begin_handler(ngx_event_t *event);
static void ngx_stream_upstream_check_connect_handler(ngx_event_t *event);
static void ngx_stream_upstream_check_peek_handler(ngx_event_t *event);
static void ngx_stream_upstream_check_send_handler(ngx_event_t *event);
static void ngx_stream_upstream_check_recv_handler(ngx_event_t *event);
static void ngx_stream_upstream_check_discard_handler(ngx_event_t *event);
static void ngx_stream_upstream_check_dummy_handler(ngx_event_t *event);
static ngx_int_t ngx_stream_upstream_check_http_init(
ngx_stream_upstream_check_peer_t *peer);
static ngx_int_t ngx_stream_upstream_check_http_parse(
ngx_stream_upstream_check_peer_t *peer);
static ngx_int_t ngx_stream_upstream_check_parse_status_line(
ngx_stream_upstream_check_ctx_t *ctx, ngx_buf_t *b,
ngx_http_status_t *status);
static void ngx_stream_upstream_check_http_reinit(
ngx_stream_upstream_check_peer_t *peer);
static void ngx_stream_upstream_check_status_update(
ngx_stream_upstream_check_peer_t *peer,
ngx_int_t result);
static void ngx_stream_upstream_check_clean_event(
ngx_stream_upstream_check_peer_t *peer);
static void ngx_stream_upstream_check_timeout_handler(ngx_event_t *event);
static void ngx_stream_upstream_check_finish_handler(ngx_event_t *event);
static ngx_int_t ngx_stream_upstream_check_need_exit();
static void ngx_stream_upstream_check_clear_all_events();
//begin check_status function declare
static ngx_int_t ngx_stream_upstream_check_status_handler(
ngx_http_request_t *r);
static void ngx_stream_upstream_check_status_parse_args(ngx_http_request_t *r,
ngx_stream_upstream_check_status_ctx_t *ctx);
static ngx_int_t ngx_stream_upstream_check_status_command_format(
ngx_stream_upstream_check_status_ctx_t *ctx, ngx_str_t *value);
static ngx_int_t ngx_stream_upstream_check_status_command_status(
ngx_stream_upstream_check_status_ctx_t *ctx, ngx_str_t *value);
static void ngx_stream_upstream_check_status_html_format(ngx_buf_t *b,
ngx_stream_upstream_check_peers_t *peers, ngx_uint_t flag);
static void ngx_stream_upstream_check_status_csv_format(ngx_buf_t *b,
ngx_stream_upstream_check_peers_t *peers, ngx_uint_t flag);
static void ngx_stream_upstream_check_status_json_format(ngx_buf_t *b,
ngx_stream_upstream_check_peers_t *peers, ngx_uint_t flag);
static ngx_check_status_conf_t *ngx_http_get_check_status_format_conf(
ngx_str_t *str);
static char *ngx_stream_upstream_check_status(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static void *ngx_stream_upstream_check_create_loc_conf(ngx_conf_t *cf);
static char * ngx_stream_upstream_check_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
//end check_status function declare
static ngx_int_t ngx_stream_upstream_check_addr_change_port(ngx_pool_t *pool,
ngx_addr_t *dst, ngx_addr_t *src, ngx_uint_t port);
static ngx_check_conf_t *ngx_http_get_check_type_conf(ngx_str_t *str);
static char *ngx_stream_upstream_check(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_stream_upstream_check_keepalive_requests(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_stream_upstream_check_http_send(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_stream_upstream_check_http_expect_alive(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_stream_upstream_check_shm_size(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
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);
#define SHM_NAME_LEN 256
static char *ngx_stream_upstream_check_init_shm(ngx_conf_t *cf, void *conf);
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 ngx_shm_zone_t *ngx_shared_memory_find(ngx_cycle_t *cycle,
ngx_str_t *name, void *tag);
static ngx_stream_upstream_check_peer_shm_t *
ngx_stream_upstream_check_find_shm_peer(ngx_stream_upstream_check_peers_shm_t *peers_shm,
ngx_addr_t *addr, ngx_str_t *upstream_name);
static ngx_int_t ngx_stream_upstream_check_init_shm_peer(
ngx_stream_upstream_check_peer_shm_t *peer_shm,
ngx_stream_upstream_check_peer_shm_t *opeer_shm,
ngx_uint_t init_down, ngx_pool_t *pool, ngx_str_t *peer_name, ngx_str_t *upstream_name);
static ngx_int_t ngx_stream_upstream_check_init_shm_zone(
ngx_shm_zone_t *shm_zone, void *data);
static ngx_int_t ngx_stream_upstream_check_init_process(ngx_cycle_t *cycle);
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,
0,
0,
NULL },
{ ngx_string("check_keepalive_requests"),
NGX_STREAM_UPS_CONF|NGX_CONF_TAKE1,
ngx_stream_upstream_check_keepalive_requests,
0,
0,
NULL },
{ ngx_string("check_http_send"),
NGX_STREAM_UPS_CONF|NGX_CONF_TAKE1,
ngx_stream_upstream_check_http_send,
0,
0,
NULL },
{ ngx_string("check_http_expect_alive"),
NGX_STREAM_UPS_CONF|NGX_CONF_1MORE,
ngx_stream_upstream_check_http_expect_alive,
0,
0,
NULL },
{ ngx_string("check_shm_size"),
NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE1,
ngx_stream_upstream_check_shm_size,
0,
0,
NULL },
ngx_null_command
};
static ngx_stream_module_t ngx_stream_upstream_check_module_ctx = {
NULL, /* preconfiguration */
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_upstream_check_init_process, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_check_conf_t ngx_check_types[] = {
{ NGX_HTTP_CHECK_TCP,
ngx_string("tcp"),
ngx_null_string,
0,
ngx_stream_upstream_check_peek_handler,
ngx_stream_upstream_check_peek_handler,
NULL,
NULL,
NULL,
0, //zhoucx: need_pool ?
0 }, //zhoucx: need_keepalive ? i change it to no
{ NGX_HTTP_CHECK_UDP,
ngx_string("udp"),
ngx_string("X"),/* zhoucx: default send data.
(we must send some data and then call recv to trigger icmp error response).*/
0,
ngx_stream_upstream_check_send_handler,
ngx_stream_upstream_check_peek_handler,
ngx_stream_upstream_check_http_init,
NULL,
ngx_stream_upstream_check_http_reinit,
1,
0 },
{ NGX_HTTP_CHECK_HTTP,
ngx_string("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_upstream_check_send_handler,
ngx_stream_upstream_check_recv_handler,
ngx_stream_upstream_check_http_init,
ngx_stream_upstream_check_http_parse,
ngx_stream_upstream_check_http_reinit,
1,
1 },
{ 0,
ngx_null_string,
ngx_null_string,
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0 }
};
static ngx_uint_t ngx_stream_upstream_check_shm_generation = 0; //zhoucx: what's mean?
static ngx_stream_upstream_check_peers_t *check_peers_ctx = NULL;
ngx_uint_t
ngx_stream_upstream_check_add_peer(ngx_conf_t *cf,
ngx_stream_upstream_srv_conf_t *us, ngx_addr_t *peer_addr)
{
ngx_stream_upstream_check_peer_t *peer;
ngx_stream_upstream_check_peers_t *peers;
ngx_stream_upstream_check_srv_conf_t *ucscf;
ngx_stream_upstream_check_main_conf_t *ucmcf;
ngx_log_error(NGX_LOG_INFO, cf->log, 0,
"add a peer:( %V ) to stream health check list.",
&peer_addr->name);
if (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;
}
ucmcf = ngx_stream_conf_get_module_main_conf(cf,
ngx_stream_upstream_check_module);
peers = ucmcf->peers;
peer = ngx_array_push(&peers->peers);
if (peer == NULL) {
return NGX_ERROR;
}
ngx_memzero(peer, sizeof(ngx_stream_upstream_check_peer_t));
peer->index = peers->peers.nelts - 1;
peer->conf = ucscf;
peer->upstream_name = &us->host;
peer->peer_addr = peer_addr;
if (ucscf->port) {
peer->check_peer_addr = ngx_pcalloc(cf->pool, sizeof(ngx_addr_t));
if (peer->check_peer_addr == NULL) {
return NGX_ERROR;
}
if (ngx_stream_upstream_check_addr_change_port(cf->pool,
peer->check_peer_addr, peer_addr, ucscf->port)
!= NGX_OK) {
return NGX_ERROR;
}
} else {
peer->check_peer_addr = peer->peer_addr;
}
peers->checksum +=
ngx_murmur_hash2(peer_addr->name.data, peer_addr->name.len);
return peer->index;
}
static ngx_int_t
ngx_stream_upstream_check_addr_change_port(ngx_pool_t *pool, ngx_addr_t *dst,
ngx_addr_t *src, ngx_uint_t port)
{
size_t len;
u_char *p;
struct sockaddr_in *sin;
#if (NGX_HAVE_INET6)
struct sockaddr_in6 *sin6;
#endif
dst->socklen = src->socklen;
dst->sockaddr = ngx_palloc(pool, dst->socklen);
if (dst->sockaddr == NULL) {
return NGX_ERROR;
}
ngx_memcpy(dst->sockaddr, src->sockaddr, dst->socklen);
switch (dst->sockaddr->sa_family) {
case AF_INET:
len = NGX_INET_ADDRSTRLEN + sizeof(":65535") - 1;
sin = (struct sockaddr_in *) dst->sockaddr;
sin->sin_port = htons(port);
break;
#if (NGX_HAVE_INET6)
case AF_INET6:
len = NGX_INET6_ADDRSTRLEN + sizeof(":65535") - 1;
sin6 = (struct sockaddr_in6 *) dst->sockaddr;
sin6->sin6_port = htons(port);
break;
#endif
default:
return NGX_ERROR;
}
p = ngx_pnalloc(pool, len);
if (p == NULL) {
return NGX_ERROR;
}
#if (nginx_version >= 1005012)
len = ngx_sock_ntop(dst->sockaddr, dst->socklen, p, len, 1);
#else
len = ngx_sock_ntop(dst->sockaddr, p, len, 1);
#endif
dst->name.len = len;
dst->name.data = p;
return NGX_OK;
}
ngx_uint_t
ngx_stream_upstream_check_peer_down(ngx_uint_t index)
{
ngx_stream_upstream_check_peer_t *peer;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return 0;
}
peer = check_peers_ctx->peers.elts;
return (peer[index].shm->down);
}
/* TODO: this interface can count each peer's busyness */
void
ngx_stream_upstream_check_get_peer(ngx_uint_t index)
{
ngx_stream_upstream_check_peer_t *peer;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return;
}
peer = check_peers_ctx->peers.elts;
ngx_shmtx_lock(&peer[index].shm->mutex);
peer[index].shm->busyness++;
peer[index].shm->access_count++;
ngx_shmtx_unlock(&peer[index].shm->mutex);
}
void
ngx_stream_upstream_check_free_peer(ngx_uint_t index)
{
ngx_stream_upstream_check_peer_t *peer;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return;
}
peer = check_peers_ctx->peers.elts;
ngx_shmtx_lock(&peer[index].shm->mutex);
if (peer[index].shm->busyness > 0) {
peer[index].shm->busyness--;
}
ngx_shmtx_unlock(&peer[index].shm->mutex);
}
static ngx_int_t
ngx_stream_upstream_check_add_timers(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_msec_t t, delay;
ngx_check_conf_t *cf;
ngx_stream_upstream_check_peer_t *peer;
ngx_stream_upstream_check_peers_t *peers;
ngx_stream_upstream_check_srv_conf_t *ucscf;
ngx_stream_upstream_check_peer_shm_t *peer_shm;
ngx_stream_upstream_check_peers_shm_t *peers_shm;
peers = check_peers_ctx;
if (peers == NULL) {
return NGX_OK;
}
peers_shm = peers->peers_shm;
if (peers_shm == NULL) {
return NGX_OK;
}
ngx_log_debug2(NGX_LOG_DEBUG_STREAM, cycle->log, 0,
"stream check upstream init_process, shm_name: %V, "
"peer number: %ud",
&peers->check_shm_name,
peers->peers.nelts);
srandom(ngx_pid);
peer = peers->peers.elts;
peer_shm = peers_shm->peers;
for (i = 0; i < peers->peers.nelts; i++) {
peer[i].shm = &peer_shm[i];
peer[i].check_ev.handler = ngx_stream_upstream_check_begin_handler;
peer[i].check_ev.log = cycle->log;
peer[i].check_ev.data = &peer[i];
peer[i].check_ev.timer_set = 0;
peer[i].check_timeout_ev.handler =
ngx_stream_upstream_check_timeout_handler;
peer[i].check_timeout_ev.log = cycle->log;
peer[i].check_timeout_ev.data = &peer[i];
peer[i].check_timeout_ev.timer_set = 0;
ucscf = peer[i].conf;
cf = ucscf->check_type_conf;
if (cf->need_pool) {
peer[i].pool = ngx_create_pool(ngx_pagesize, cycle->log);
if (peer[i].pool == NULL) {
return NGX_ERROR;
}
}
peer[i].send_handler = cf->send_handler;
peer[i].recv_handler = cf->recv_handler;
peer[i].init = cf->init;
peer[i].parse = cf->parse;
peer[i].reinit = cf->reinit;
/*
* We add a random start time here, since we don't want to trigger
* the check events too close to each other at the beginning.
*/
delay = ucscf->check_interval > 1000 ? ucscf->check_interval : 1000;
t = ngx_random() % delay;
ngx_add_timer(&peer[i].check_ev, t);
}
return NGX_OK;
}
static void
ngx_stream_upstream_check_begin_handler(ngx_event_t *event)
{
ngx_msec_t interval;
ngx_stream_upstream_check_peer_t *peer;
ngx_stream_upstream_check_peers_t *peers;
ngx_stream_upstream_check_srv_conf_t *ucscf;
ngx_stream_upstream_check_peers_shm_t *peers_shm;
if (ngx_stream_upstream_check_need_exit()) {
return;
}
peers = check_peers_ctx;
if (peers == NULL) {
return;
}
peers_shm = peers->peers_shm;
if (peers_shm == NULL) {
return;
}
peer = event->data;
ucscf = peer->conf;
ngx_add_timer(event, ucscf->check_interval / 2);//zhoucx: what's mean?
/* This process is processing this peer now. */
if ((peer->shm->owner == ngx_pid ||
(peer->pc.connection != NULL) ||
peer->check_timeout_ev.timer_set)) {
return;
}
interval = ngx_current_msec - peer->shm->access_time;
ngx_log_debug6(NGX_LOG_DEBUG_STREAM, event->log, 0,
"stream check begin handler for (%V): index: %ui, owner: %P, "
"ngx_pid: %P, current interval: %M, check_interval: %M",
&peer->check_peer_addr->name, peer->index, peer->shm->owner,
ngx_pid, interval,
ucscf->check_interval);
ngx_shmtx_lock(&peer->shm->mutex);
if (peers_shm->generation != ngx_stream_upstream_check_shm_generation) {
ngx_shmtx_unlock(&peer->shm->mutex);
return;
}
if ((interval >= ucscf->check_interval)
&& (peer->shm->owner == NGX_INVALID_PID))
{
peer->shm->owner = ngx_pid;
} else if (interval >= (ucscf->check_interval << 4)) {
/*
* If the check peer has been untouched for 2^4 times of
* the check interval, activate the current timer.
* Sometimes, the checking process may disappear
* in some circumstances, and the clean event will never
* be triggered.
*/
peer->shm->owner = ngx_pid;
peer->shm->access_time = ngx_current_msec;
}
ngx_shmtx_unlock(&peer->shm->mutex);
if (peer->shm->owner == ngx_pid) {
ngx_stream_upstream_check_connect_handler(event);
}
}
static void
ngx_stream_upstream_check_connect_handler(ngx_event_t *event)
{
ngx_int_t rc;
ngx_connection_t *c;
ngx_stream_upstream_check_peer_t *peer;
ngx_stream_upstream_check_srv_conf_t *ucscf;
if (ngx_stream_upstream_check_need_exit()) {
return;
}
peer = event->data;
ucscf = peer->conf;
if (peer->pc.connection != NULL) {
c = peer->pc.connection;
if ((rc = ngx_stream_upstream_check_peek_one_byte(c)) == NGX_OK) {
goto upstream_check_connect_done;
} else {
ngx_close_connection(c);
peer->pc.connection = NULL;
}
}
ngx_memzero(&peer->pc, sizeof(ngx_peer_connection_t));
peer->pc.sockaddr = peer->check_peer_addr->sockaddr;
peer->pc.socklen = peer->check_peer_addr->socklen;
peer->pc.name = &peer->check_peer_addr->name;
peer->pc.type = (ucscf->check_type_conf->type==NGX_HTTP_CHECK_UDP)?SOCK_DGRAM:SOCK_STREAM;
peer->pc.get = ngx_event_get_peer;
peer->pc.log = event->log;
peer->pc.log_error = NGX_ERROR_ERR;
peer->pc.cached = 0;
peer->pc.connection = NULL;
rc = ngx_event_connect_peer(&peer->pc);
if (rc == NGX_ERROR || rc == NGX_DECLINED) {
ngx_stream_upstream_check_status_update(peer, 0);
return;
}
/* NGX_OK or NGX_AGAIN */
c = peer->pc.connection;
c->data = peer;
c->log = peer->pc.log;
c->sendfile = 0;
c->read->log = c->log;
c->write->log = c->log;
c->pool = peer->pool;
//zhoucx: set sock opt "IP_RECVERR" in order to recv icmp error like host unreachable.
int val = 1;
if( setsockopt( c->fd, SOL_IP, IP_RECVERR, &val, sizeof(val) ) == -1 ){
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"setsockopt(IP_RECVERR) failed with peer: %V ",
&peer->check_peer_addr->name);
}
upstream_check_connect_done:
peer->state = NGX_HTTP_CHECK_CONNECT_DONE;
c->write->handler = peer->send_handler;
c->read->handler = peer->recv_handler;
ngx_add_timer(&peer->check_timeout_ev, ucscf->check_timeout);//zhoucx: start connect timeout timer.
/* The kqueue's loop interface needs it. */
if (rc == NGX_OK) {
c->write->handler(c->write); //zhoucx: it is check_type->send_handler.
}
}
static ngx_int_t
ngx_stream_upstream_check_peek_one_byte(ngx_connection_t *c)
{
char buf[1];
ngx_int_t n;
ngx_err_t err;
n = recv(c->fd, buf, 1, MSG_PEEK);
err = ngx_socket_errno;
ngx_log_debug2(NGX_LOG_DEBUG_STREAM, c->log, err,
"stream check upstream recv(): %i, fd: %d",
n, c->fd);
if (n == 1 || (n == -1 && err == NGX_EAGAIN)) {
return NGX_OK;
} else {
return NGX_ERROR;
}
}
static void
ngx_stream_upstream_check_peek_handler(ngx_event_t *event)
{
ngx_connection_t *c;
ngx_stream_upstream_check_peer_t *peer;
if (ngx_stream_upstream_check_need_exit()) {
return;
}
c = event->data;
peer = c->data;
if (ngx_stream_upstream_check_peek_one_byte(c) == NGX_OK) {
ngx_stream_upstream_check_status_update(peer, 1);
} else {
c->error = 1;
ngx_stream_upstream_check_status_update(peer, 0);
}
ngx_stream_upstream_check_clean_event(peer);
ngx_stream_upstream_check_finish_handler(event);
}
static void
ngx_stream_upstream_check_discard_handler(ngx_event_t *event)
{
u_char buf[4096];
ssize_t size;
ngx_connection_t *c;
ngx_stream_upstream_check_peer_t *peer;
c = event->data;
ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0,
"upstream check discard handler");
if (ngx_stream_upstream_check_need_exit()) {
return;
}
peer = c->data;
while (1) {
size = c->recv(c, buf, 4096);
if (size > 0) {
continue;
} else if (size == NGX_AGAIN) {
break;
} else {
if (size == 0) {
ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0,
"peer closed its half side of the connection");
}
goto check_discard_fail;
}
}
if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
goto check_discard_fail;
}
return;
check_discard_fail:
c->error = 1;
ngx_stream_upstream_check_clean_event(peer);
}
static void
ngx_stream_upstream_check_dummy_handler(ngx_event_t *event)
{
return;
}
static void
ngx_stream_upstream_check_send_handler(ngx_event_t *event)
{
ssize_t size;
ngx_connection_t *c;
ngx_stream_upstream_check_ctx_t *ctx;
ngx_stream_upstream_check_peer_t *peer;
if (ngx_stream_upstream_check_need_exit()) {
return;
}
c = event->data;
peer = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0, "stream check send.");
if (c->pool == NULL) {
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"check pool NULL with peer: %V ",
&peer->check_peer_addr->name);
goto check_send_fail;
}
if (peer->state != NGX_HTTP_CHECK_CONNECT_DONE) {
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"check handle write event error with peer: %V ",
&peer->check_peer_addr->name);