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ngx_http_upstream_check_module.c
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ngx_http_upstream_check_module.c
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/*
* Copyright (C) 2010-2014 Weibin Yao ([email protected])
* Copyright (C) 2010-2014 Alibaba Group Holding Limited
*/
#include <nginx.h>
#include "ngx_http_upstream_check_module.h"
typedef struct ngx_http_upstream_check_peer_s ngx_http_upstream_check_peer_t;
typedef struct ngx_http_upstream_check_srv_conf_s
ngx_http_upstream_check_srv_conf_t;
#pragma pack(push, 1)
typedef struct {
u_char major;
u_char minor;
} ngx_ssl_protocol_version_t;
typedef struct {
u_char msg_type;
ngx_ssl_protocol_version_t version;
uint16_t length;
u_char handshake_type;
u_char handshake_length[3];
ngx_ssl_protocol_version_t hello_version;
time_t time;
u_char random[28];
u_char others[0];
} ngx_ssl_server_hello_t;
typedef struct {
u_char packet_length[3];
u_char packet_number;
u_char protocol_version;
u_char others[0];
} ngx_mysql_handshake_init_t;
typedef struct {
uint16_t preamble;
uint16_t length;
u_char type;
} ngx_ajp_raw_packet_t;
#pragma pack()
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_http_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;
u_char padding[64];
} ngx_http_upstream_check_peer_shm_t;
typedef struct {
ngx_uint_t generation;
ngx_uint_t checksum;
ngx_uint_t number;
/* ngx_http_upstream_check_status_peer_t */
ngx_http_upstream_check_peer_shm_t peers[1];
} ngx_http_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_http_upstream_check_packet_init_pt)
(ngx_http_upstream_check_peer_t *peer);
typedef ngx_int_t (*ngx_http_upstream_check_packet_parse_pt)
(ngx_http_upstream_check_peer_t *peer);
typedef void (*ngx_http_upstream_check_packet_clean_pt)
(ngx_http_upstream_check_peer_t *peer);
struct ngx_http_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_http_upstream_check_packet_init_pt init;
ngx_http_upstream_check_packet_parse_pt parse;
ngx_http_upstream_check_packet_clean_pt reinit;
ngx_http_upstream_check_peer_shm_t *shm;
ngx_http_upstream_check_srv_conf_t *conf;
};
typedef struct {
ngx_str_t check_shm_name;
ngx_uint_t checksum;
ngx_array_t peers;
ngx_http_upstream_check_peers_shm_t *peers_shm;
} ngx_http_upstream_check_peers_t;
#define NGX_HTTP_CHECK_TCP 0x0001
#define NGX_HTTP_CHECK_HTTP 0x0002
#define NGX_HTTP_CHECK_SSL_HELLO 0x0004
#define NGX_HTTP_CHECK_MYSQL 0x0008
#define NGX_HTTP_CHECK_AJP 0x0010
#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_http_upstream_check_packet_init_pt init;
ngx_http_upstream_check_packet_parse_pt parse;
ngx_http_upstream_check_packet_clean_pt reinit;
unsigned need_pool;
unsigned need_keepalive;
} ngx_check_conf_t;
typedef void (*ngx_http_upstream_check_status_format_pt) (ngx_buf_t *b,
ngx_http_upstream_check_peers_t *peers, ngx_uint_t flag);
typedef struct {
ngx_str_t format;
ngx_str_t content_type;
ngx_http_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_http_upstream_check_status_ctx_t;
typedef ngx_int_t (*ngx_http_upstream_check_status_command_pt)
(ngx_http_upstream_check_status_ctx_t *ctx, ngx_str_t *value);
typedef struct {
ngx_str_t name;
ngx_http_upstream_check_status_command_pt handler;
} ngx_check_status_command_t;
typedef struct {
ngx_uint_t check_shm_size;
ngx_http_upstream_check_peers_t *peers;
} ngx_http_upstream_check_main_conf_t;
struct ngx_http_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_array_t *fastcgi_params;
ngx_uint_t default_down;
};
typedef struct {
ngx_check_status_conf_t *format;
} ngx_http_upstream_check_loc_conf_t;
typedef struct {
u_char version;
u_char type;
u_char request_id_hi;
u_char request_id_lo;
u_char content_length_hi;
u_char content_length_lo;
u_char padding_length;
u_char reserved;
} ngx_http_fastcgi_header_t;
typedef struct {
u_char role_hi;
u_char role_lo;
u_char flags;
u_char reserved[5];
} ngx_http_fastcgi_begin_request_t;
typedef struct {
u_char version;
u_char type;
u_char request_id_hi;
u_char request_id_lo;
} ngx_http_fastcgi_header_small_t;
typedef struct {
ngx_http_fastcgi_header_t h0;
ngx_http_fastcgi_begin_request_t br;
ngx_http_fastcgi_header_small_t h1;
} ngx_http_fastcgi_request_start_t;
#define NGX_HTTP_FASTCGI_RESPONDER 1
#define NGX_HTTP_FASTCGI_KEEP_CONN 1
#define NGX_HTTP_FASTCGI_BEGIN_REQUEST 1
#define NGX_HTTP_FASTCGI_ABORT_REQUEST 2
#define NGX_HTTP_FASTCGI_END_REQUEST 3
#define NGX_HTTP_FASTCGI_PARAMS 4
#define NGX_HTTP_FASTCGI_STDIN 5
#define NGX_HTTP_FASTCGI_STDOUT 6
#define NGX_HTTP_FASTCGI_STDERR 7
#define NGX_HTTP_FASTCGI_DATA 8
typedef enum {
ngx_http_fastcgi_st_version = 0,
ngx_http_fastcgi_st_type,
ngx_http_fastcgi_st_request_id_hi,
ngx_http_fastcgi_st_request_id_lo,
ngx_http_fastcgi_st_content_length_hi,
ngx_http_fastcgi_st_content_length_lo,
ngx_http_fastcgi_st_padding_length,
ngx_http_fastcgi_st_reserved,
ngx_http_fastcgi_st_data,
ngx_http_fastcgi_st_padding
} ngx_http_fastcgi_state_e;
static ngx_http_fastcgi_request_start_t ngx_http_fastcgi_request_start = {
{ 1, /* version */
NGX_HTTP_FASTCGI_BEGIN_REQUEST, /* type */
0, /* request_id_hi */
1, /* request_id_lo */
0, /* content_length_hi */
sizeof(ngx_http_fastcgi_begin_request_t), /* content_length_lo */
0, /* padding_length */
0 }, /* reserved */
{ 0, /* role_hi */
NGX_HTTP_FASTCGI_RESPONDER, /* role_lo */
0, /* NGX_HTTP_FASTCGI_KEEP_CONN */ /* flags */
{ 0, 0, 0, 0, 0 } }, /* reserved[5] */
{ 1, /* version */
NGX_HTTP_FASTCGI_PARAMS, /* type */
0, /* request_id_hi */
1 }, /* request_id_lo */
};
static ngx_int_t ngx_http_upstream_check_add_timers(ngx_cycle_t *cycle);
static ngx_int_t ngx_http_upstream_check_peek_one_byte(ngx_connection_t *c);
static void ngx_http_upstream_check_begin_handler(ngx_event_t *event);
static void ngx_http_upstream_check_connect_handler(ngx_event_t *event);
static void ngx_http_upstream_check_peek_handler(ngx_event_t *event);
static void ngx_http_upstream_check_send_handler(ngx_event_t *event);
static void ngx_http_upstream_check_recv_handler(ngx_event_t *event);
static void ngx_http_upstream_check_discard_handler(ngx_event_t *event);
static void ngx_http_upstream_check_dummy_handler(ngx_event_t *event);
static ngx_int_t ngx_http_upstream_check_http_init(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_http_parse(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_parse_status_line(
ngx_http_upstream_check_ctx_t *ctx, ngx_buf_t *b,
ngx_http_status_t *status);
static void ngx_http_upstream_check_http_reinit(
ngx_http_upstream_check_peer_t *peer);
static ngx_buf_t *ngx_http_upstream_check_create_fastcgi_request(
ngx_pool_t *pool, ngx_str_t *params, ngx_uint_t num);
static ngx_int_t ngx_http_upstream_check_fastcgi_parse(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_fastcgi_process_record(
ngx_http_upstream_check_ctx_t *ctx, ngx_buf_t *b,
ngx_http_status_t *status);
static ngx_int_t ngx_http_upstream_check_parse_fastcgi_status(
ngx_http_upstream_check_ctx_t *ctx, ngx_buf_t *b,
ngx_http_status_t *status);
static ngx_int_t ngx_http_upstream_check_ssl_hello_init(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_ssl_hello_parse(
ngx_http_upstream_check_peer_t *peer);
static void ngx_http_upstream_check_ssl_hello_reinit(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_mysql_init(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_mysql_parse(
ngx_http_upstream_check_peer_t *peer);
static void ngx_http_upstream_check_mysql_reinit(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_ajp_init(
ngx_http_upstream_check_peer_t *peer);
static ngx_int_t ngx_http_upstream_check_ajp_parse(
ngx_http_upstream_check_peer_t *peer);
static void ngx_http_upstream_check_ajp_reinit(
ngx_http_upstream_check_peer_t *peer);
static void ngx_http_upstream_check_status_update(
ngx_http_upstream_check_peer_t *peer,
ngx_int_t result);
static void ngx_http_upstream_check_clean_event(
ngx_http_upstream_check_peer_t *peer);
static void ngx_http_upstream_check_timeout_handler(ngx_event_t *event);
static void ngx_http_upstream_check_finish_handler(ngx_event_t *event);
static ngx_int_t ngx_http_upstream_check_need_exit();
static void ngx_http_upstream_check_clear_all_events();
static ngx_int_t ngx_http_upstream_check_status_handler(
ngx_http_request_t *r);
static void ngx_http_upstream_check_status_parse_args(ngx_http_request_t *r,
ngx_http_upstream_check_status_ctx_t *ctx);
static ngx_int_t ngx_http_upstream_check_status_command_format(
ngx_http_upstream_check_status_ctx_t *ctx, ngx_str_t *value);
static ngx_int_t ngx_http_upstream_check_status_command_status(
ngx_http_upstream_check_status_ctx_t *ctx, ngx_str_t *value);
static void ngx_http_upstream_check_status_html_format(ngx_buf_t *b,
ngx_http_upstream_check_peers_t *peers, ngx_uint_t flag);
static void ngx_http_upstream_check_status_csv_format(ngx_buf_t *b,
ngx_http_upstream_check_peers_t *peers, ngx_uint_t flag);
static void ngx_http_upstream_check_status_json_format(ngx_buf_t *b,
ngx_http_upstream_check_peers_t *peers, ngx_uint_t flag);
static ngx_int_t ngx_http_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_http_upstream_check(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_http_upstream_check_keepalive_requests(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_http_upstream_check_http_send(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_http_upstream_check_http_expect_alive(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_http_upstream_check_fastcgi_params(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static char *ngx_http_upstream_check_shm_size(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static ngx_check_status_conf_t *ngx_http_get_check_status_format_conf(
ngx_str_t *str);
static char *ngx_http_upstream_check_status(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static void *ngx_http_upstream_check_create_main_conf(ngx_conf_t *cf);
static char *ngx_http_upstream_check_init_main_conf(ngx_conf_t *cf,
void *conf);
static void *ngx_http_upstream_check_create_srv_conf(ngx_conf_t *cf);
static char *ngx_http_upstream_check_init_srv_conf(ngx_conf_t *cf, void *conf);
static void *ngx_http_upstream_check_create_loc_conf(ngx_conf_t *cf);
static char * ngx_http_upstream_check_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
#define SHM_NAME_LEN 256
static char *ngx_http_upstream_check_init_shm(ngx_conf_t *cf, void *conf);
static ngx_int_t ngx_http_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_http_upstream_check_peer_shm_t *
ngx_http_upstream_check_find_shm_peer(ngx_http_upstream_check_peers_shm_t *peers_shm,
ngx_addr_t *addr);
static ngx_int_t ngx_http_upstream_check_init_shm_peer(
ngx_http_upstream_check_peer_shm_t *peer_shm,
ngx_http_upstream_check_peer_shm_t *opeer_shm,
ngx_uint_t init_down, ngx_pool_t *pool, ngx_str_t *peer_name);
static ngx_int_t ngx_http_upstream_check_init_shm_zone(
ngx_shm_zone_t *shm_zone, void *data);
static ngx_int_t ngx_http_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_http_upstream_check_commands[] = {
{ ngx_string("check"),
NGX_HTTP_UPS_CONF|NGX_CONF_1MORE,
ngx_http_upstream_check,
0,
0,
NULL },
{ ngx_string("check_keepalive_requests"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_http_upstream_check_keepalive_requests,
0,
0,
NULL },
{ ngx_string("check_http_send"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE1,
ngx_http_upstream_check_http_send,
0,
0,
NULL },
{ ngx_string("check_http_expect_alive"),
NGX_HTTP_UPS_CONF|NGX_CONF_1MORE,
ngx_http_upstream_check_http_expect_alive,
0,
0,
NULL },
{ ngx_string("check_fastcgi_param"),
NGX_HTTP_UPS_CONF|NGX_CONF_TAKE2,
ngx_http_upstream_check_fastcgi_params,
0,
0,
NULL },
{ ngx_string("check_shm_size"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
ngx_http_upstream_check_shm_size,
0,
0,
NULL },
{ ngx_string("check_status"),
NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1|NGX_CONF_NOARGS,
ngx_http_upstream_check_status,
0,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_upstream_check_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
ngx_http_upstream_check_create_main_conf,/* create main configuration */
ngx_http_upstream_check_init_main_conf, /* init main configuration */
ngx_http_upstream_check_create_srv_conf, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_upstream_check_create_loc_conf, /* create location configuration */
ngx_http_upstream_check_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_upstream_check_module = {
NGX_MODULE_V1,
&ngx_http_upstream_check_module_ctx, /* module context */
ngx_http_upstream_check_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
ngx_http_upstream_check_init_process, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_str_t fastcgi_default_request;
static ngx_str_t fastcgi_default_params[] = {
ngx_string("REQUEST_METHOD"), ngx_string("GET"),
ngx_string("REQUEST_URI"), ngx_string("/"),
ngx_string("SCRIPT_FILENAME"), ngx_string("index.php"),
};
#define NGX_SSL_RANDOM "NGX_HTTP_CHECK_SSL_HELLO\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.
*/
static char sslv3_client_hello_pkt[] = {
"\x16" /* ContentType : 0x16 = Hanshake */
"\x03\x01" /* ProtocolVersion : 0x0301 = TLSv1.0 */
"\x00\x6f" /* ContentLength : 0x6f bytes after this one */
"\x01" /* HanshakeType : 0x01 = CLIENT HELLO */
"\x00\x00\x6b" /* HandshakeLength : 0x6b bytes after this one */
"\x03\x03" /* Hello Version : 0x0303 = TLSv1.2 */
"\x00\x00\x00\x00" /* Unix GMT Time (s) : filled with <now> (@0x0B) */
NGX_SSL_RANDOM /* Random : must be exactly 28 bytes */
"\x00" /* Session ID length : empty (no session ID) */
"\x00\x1a" /* Cipher Suite Length : \x1a bytes after this one */
"\xc0\x2b" "\xc0\x2f" "\xcc\xa9" "\xcc\xa8" /* 13 modern ciphers */
"\xc0\x0a" "\xc0\x09" "\xc0\x13" "\xc0\x14"
"\x00\x33" "\x00\x39" "\x00\x2f" "\x00\x35"
"\x00\x0a"
"\x01" /* Compression Length : 0x01 = 1 byte for types */
"\x00" /* Compression Type : 0x00 = NULL compression */
"\x00\x28" /* Extensions length */
"\x00\x0a" /* EC extension */
"\x00\x08" /* extension length */
"\x00\x06" /* curves length */
"\x00\x17" "\x00\x18" "\x00\x19" /* Three curves */
"\x00\x0d" /* Signature extension */
"\x00\x18" /* extension length */
"\x00\x16" /* hash list length */
"\x04\x01" "\x05\x01" "\x06\x01" "\x02\x01" /* 11 hash algorithms */
"\x04\x03" "\x05\x03" "\x06\x03" "\x02\x03"
"\x05\x02" "\x04\x02" "\x02\x02"
};
#define NGX_SSL_HANDSHAKE 0x16
#define NGX_SSL_SERVER_HELLO 0x02
#define NGX_AJP_CPING 0x0a
#define NGX_AJP_CPONG 0x09
static char ngx_ajp_cping_packet[] = {
0x12, 0x34, 0x00, 0x01, NGX_AJP_CPING, 0x00
};
static char ngx_ajp_cpong_packet[] = {
0x41, 0x42, 0x00, 0x01, NGX_AJP_CPONG
};
static ngx_check_conf_t ngx_check_types[] = {
{ NGX_HTTP_CHECK_TCP,
ngx_string("tcp"),
ngx_null_string,
0,
ngx_http_upstream_check_peek_handler,
ngx_http_upstream_check_peek_handler,
NULL,
NULL,
NULL,
0,
1 },
{ 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_http_upstream_check_send_handler,
ngx_http_upstream_check_recv_handler,
ngx_http_upstream_check_http_init,
ngx_http_upstream_check_http_parse,
ngx_http_upstream_check_http_reinit,
1,
1 },
{ NGX_HTTP_CHECK_HTTP,
ngx_string("fastcgi"),
ngx_null_string,
0,
ngx_http_upstream_check_send_handler,
ngx_http_upstream_check_recv_handler,
ngx_http_upstream_check_http_init,
ngx_http_upstream_check_fastcgi_parse,
ngx_http_upstream_check_http_reinit,
1,
0 },
{ NGX_HTTP_CHECK_SSL_HELLO,
ngx_string("ssl_hello"),
ngx_string(sslv3_client_hello_pkt),
0,
ngx_http_upstream_check_send_handler,
ngx_http_upstream_check_recv_handler,
ngx_http_upstream_check_ssl_hello_init,
ngx_http_upstream_check_ssl_hello_parse,
ngx_http_upstream_check_ssl_hello_reinit,
1,
0 },
{ NGX_HTTP_CHECK_MYSQL,
ngx_string("mysql"),
ngx_null_string,
0,
ngx_http_upstream_check_send_handler,
ngx_http_upstream_check_recv_handler,
ngx_http_upstream_check_mysql_init,
ngx_http_upstream_check_mysql_parse,
ngx_http_upstream_check_mysql_reinit,
1,
0 },
{ NGX_HTTP_CHECK_AJP,
ngx_string("ajp"),
ngx_string(ngx_ajp_cping_packet),
0,
ngx_http_upstream_check_send_handler,
ngx_http_upstream_check_recv_handler,
ngx_http_upstream_check_ajp_init,
ngx_http_upstream_check_ajp_parse,
ngx_http_upstream_check_ajp_reinit,
1,
0 },
{ 0,
ngx_null_string,
ngx_null_string,
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0 }
};
static ngx_check_status_conf_t ngx_check_status_formats[] = {
{ ngx_string("html"),
ngx_string("text/html"),
ngx_http_upstream_check_status_html_format },
{ ngx_string("csv"),
ngx_string("text/plain"),
ngx_http_upstream_check_status_csv_format },
{ ngx_string("json"),
ngx_string("application/json"), /* RFC 4627 */
ngx_http_upstream_check_status_json_format },
{ ngx_null_string, ngx_null_string, NULL }
};
static ngx_check_status_command_t ngx_check_status_commands[] = {
{ ngx_string("format"),
ngx_http_upstream_check_status_command_format },
{ ngx_string("status"),
ngx_http_upstream_check_status_command_status },
{ ngx_null_string, NULL }
};
static ngx_uint_t ngx_http_upstream_check_shm_generation = 0;
static ngx_http_upstream_check_peers_t *check_peers_ctx = NULL;
ngx_uint_t
ngx_http_upstream_check_add_peer(ngx_conf_t *cf,
ngx_http_upstream_srv_conf_t *us, ngx_addr_t *peer_addr)
{
ngx_http_upstream_check_peer_t *peer;
ngx_http_upstream_check_peers_t *peers;
ngx_http_upstream_check_srv_conf_t *ucscf;
ngx_http_upstream_check_main_conf_t *ucmcf;
if (us->srv_conf == NULL) {
return NGX_ERROR;
}
ucscf = ngx_http_conf_upstream_srv_conf(us, ngx_http_upstream_check_module);
if(ucscf->check_interval == 0) {
return NGX_ERROR;
}
ucmcf = ngx_http_conf_get_module_main_conf(cf,
ngx_http_upstream_check_module);
peers = ucmcf->peers;
peer = ngx_array_push(&peers->peers);
if (peer == NULL) {
return NGX_ERROR;
}
ngx_memzero(peer, sizeof(ngx_http_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_http_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_http_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_http_upstream_check_peer_down(ngx_uint_t index)
{
ngx_http_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_http_upstream_check_get_peer(ngx_uint_t index)
{
ngx_http_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_http_upstream_check_free_peer(ngx_uint_t index)
{
ngx_http_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_http_upstream_check_add_timers(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_msec_t t, delay;
ngx_check_conf_t *cf;
ngx_http_upstream_check_peer_t *peer;
ngx_http_upstream_check_peers_t *peers;
ngx_http_upstream_check_srv_conf_t *ucscf;
ngx_http_upstream_check_peer_shm_t *peer_shm;
ngx_http_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_HTTP, cycle->log, 0,
"http 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_http_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_http_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;