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view src/event/ngx_event_connect.h @ 9067:f68fdb017141 quic

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QUIC: optimized sending stream response. When a stream is created by client, it's often the case that nginx will send immediate response on that stream. An example is HTTP/3 request stream, which in most cases quickly replies with at least HTTP headers. QUIC stream init handlers are called from a posted event. Output QUIC frames are also sent to client from a posted event, called the push event. If the push event is posted before the stream init event, then output produced by stream may trigger sending an extra UDP datagram. To address this, push event is now re-posted when a new stream init event is posted. An example is handling 0-RTT packets. Client typically sends an init packet coalesced with a 0-RTT packet. Previously, nginx replied with a padded CRYPTO datagram, followed by a 1-RTT stream reply datagram. Now CRYPTO and STREAM packets are coalesced in one reply datagram, which saves bandwidth. Other examples include coalescing 1-RTT first stream response, and MAX_STREAMS/STREAM sent in response to ACK/STREAM.
author Roman Arutyunyan <arut@nginx.com>
date Mon, 03 Apr 2023 16:17:12 +0400
parents 570d8c626eea
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_EVENT_CONNECT_H_INCLUDED_
#define _NGX_EVENT_CONNECT_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


#define NGX_PEER_KEEPALIVE           1
#define NGX_PEER_NEXT                2
#define NGX_PEER_FAILED              4


typedef struct ngx_peer_connection_s  ngx_peer_connection_t;

typedef ngx_int_t (*ngx_event_get_peer_pt)(ngx_peer_connection_t *pc,
    void *data);
typedef void (*ngx_event_free_peer_pt)(ngx_peer_connection_t *pc, void *data,
    ngx_uint_t state);
typedef void (*ngx_event_notify_peer_pt)(ngx_peer_connection_t *pc,
    void *data, ngx_uint_t type);
typedef ngx_int_t (*ngx_event_set_peer_session_pt)(ngx_peer_connection_t *pc,
    void *data);
typedef void (*ngx_event_save_peer_session_pt)(ngx_peer_connection_t *pc,
    void *data);


struct ngx_peer_connection_s {
    ngx_connection_t                *connection;

    struct sockaddr                 *sockaddr;
    socklen_t                        socklen;
    ngx_str_t                       *name;

    ngx_uint_t                       tries;
    ngx_msec_t                       start_time;

    ngx_event_get_peer_pt            get;
    ngx_event_free_peer_pt           free;
    ngx_event_notify_peer_pt         notify;
    void                            *data;

#if (NGX_SSL || NGX_COMPAT)
    ngx_event_set_peer_session_pt    set_session;
    ngx_event_save_peer_session_pt   save_session;
#endif

    ngx_addr_t                      *local;

    int                              type;
    int                              rcvbuf;

    ngx_log_t                       *log;

    unsigned                         cached:1;
    unsigned                         transparent:1;
    unsigned                         so_keepalive:1;
    unsigned                         down:1;

                                     /* ngx_connection_log_error_e */
    unsigned                         log_error:2;

    NGX_COMPAT_BEGIN(2)
    NGX_COMPAT_END
};


ngx_int_t ngx_event_connect_peer(ngx_peer_connection_t *pc);
ngx_int_t ngx_event_get_peer(ngx_peer_connection_t *pc, void *data);


#endif /* _NGX_EVENT_CONNECT_H_INCLUDED_ */