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Stream: post first read events from client and upstream. The main proxy function ngx_stream_proxy_process() can terminate the stream session. The code, following it, should check its return code to make sure the session still exists. This happens in client and upstream initialization functions. Swapping ngx_stream_proxy_process() call with the code, that follows it, leaves the same problem vice versa. In future ngx_stream_proxy_process() will call ngx_stream_proxy_next_upstream() making it too complicated to know if stream session still exists after this call. Now ngx_stream_proxy_process() is called from posted event handlers in both places with no code following it. The posted event is automatically removed once session is terminated.
author Roman Arutyunyan <arut@nginx.com>
date Tue, 15 Mar 2016 15:55:23 +0300
parents 6345822f0abb
children 8f038068f4bc
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_STREAM_UPSTREAM_H_INCLUDED_
#define _NGX_STREAM_UPSTREAM_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_stream.h>
#include <ngx_event_connect.h>


#define NGX_STREAM_UPSTREAM_CREATE        0x0001
#define NGX_STREAM_UPSTREAM_WEIGHT        0x0002
#define NGX_STREAM_UPSTREAM_MAX_FAILS     0x0004
#define NGX_STREAM_UPSTREAM_FAIL_TIMEOUT  0x0008
#define NGX_STREAM_UPSTREAM_DOWN          0x0010
#define NGX_STREAM_UPSTREAM_BACKUP        0x0020


typedef struct {
    ngx_array_t                        upstreams;
                                           /* ngx_stream_upstream_srv_conf_t */
} ngx_stream_upstream_main_conf_t;


typedef struct ngx_stream_upstream_srv_conf_s  ngx_stream_upstream_srv_conf_t;


typedef ngx_int_t (*ngx_stream_upstream_init_pt)(ngx_conf_t *cf,
    ngx_stream_upstream_srv_conf_t *us);
typedef ngx_int_t (*ngx_stream_upstream_init_peer_pt)(ngx_stream_session_t *s,
    ngx_stream_upstream_srv_conf_t *us);


typedef struct {
    ngx_stream_upstream_init_pt        init_upstream;
    ngx_stream_upstream_init_peer_pt   init;
    void                              *data;
} ngx_stream_upstream_peer_t;


typedef struct {
    ngx_str_t                          name;
    ngx_addr_t                        *addrs;
    ngx_uint_t                         naddrs;
    ngx_uint_t                         weight;
    ngx_uint_t                         max_fails;
    time_t                             fail_timeout;

    unsigned                           down:1;
    unsigned                           backup:1;
} ngx_stream_upstream_server_t;


struct ngx_stream_upstream_srv_conf_s {
    ngx_stream_upstream_peer_t         peer;
    void                             **srv_conf;

    ngx_array_t                       *servers;
                                              /* ngx_stream_upstream_server_t */

    ngx_uint_t                         flags;
    ngx_str_t                          host;
    u_char                            *file_name;
    ngx_uint_t                         line;
    in_port_t                          port;
    ngx_uint_t                         no_port;  /* unsigned no_port:1 */

#if (NGX_STREAM_UPSTREAM_ZONE)
    ngx_shm_zone_t                    *shm_zone;
#endif
};


typedef struct {
    ngx_peer_connection_t              peer;
    ngx_buf_t                          downstream_buf;
    ngx_buf_t                          upstream_buf;
    off_t                              received;
    time_t                             start_sec;
#if (NGX_STREAM_SSL)
    ngx_str_t                          ssl_name;
#endif
    unsigned                           connected:1;
    unsigned                           proxy_protocol:1;
} ngx_stream_upstream_t;


ngx_stream_upstream_srv_conf_t *ngx_stream_upstream_add(ngx_conf_t *cf,
    ngx_url_t *u, ngx_uint_t flags);


#define ngx_stream_conf_upstream_srv_conf(uscf, module)                       \
    uscf->srv_conf[module.ctx_index]


extern ngx_module_t  ngx_stream_upstream_module;


#endif /* _NGX_STREAM_UPSTREAM_H_INCLUDED_ */