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view src/http/ngx_http_spdy_module.c @ 6059:c81d79a7befd

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SPDY: always push pending data. This helps to avoid suboptimal behavior when a client waits for a control frame or more data to increase window size, but the frames have been delayed in the socket buffer. The delays can be caused by bad interaction between Nagle's algorithm on nginx side and delayed ACK on the client side or by TCP_CORK/TCP_NOPUSH if SPDY was working without SSL and sendfile() was used. The pushing code is now very similar to ngx_http_set_keepalive().
author Valentin Bartenev <vbart@nginx.com>
date Mon, 23 Mar 2015 21:04:13 +0300
parents 02ee639d18a8
children
line wrap: on
line source


/*
 * Copyright (C) Nginx, Inc.
 * Copyright (C) Valentin V. Bartenev
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_http_spdy_module.h>


static ngx_int_t ngx_http_spdy_add_variables(ngx_conf_t *cf);

static ngx_int_t ngx_http_spdy_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_spdy_request_priority_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_http_spdy_module_init(ngx_cycle_t *cycle);

static void *ngx_http_spdy_create_main_conf(ngx_conf_t *cf);
static char *ngx_http_spdy_init_main_conf(ngx_conf_t *cf, void *conf);
static void *ngx_http_spdy_create_srv_conf(ngx_conf_t *cf);
static char *ngx_http_spdy_merge_srv_conf(ngx_conf_t *cf, void *parent,
    void *child);
static void *ngx_http_spdy_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_spdy_merge_loc_conf(ngx_conf_t *cf, void *parent,
    void *child);

static char *ngx_http_spdy_recv_buffer_size(ngx_conf_t *cf, void *post,
    void *data);
static char *ngx_http_spdy_pool_size(ngx_conf_t *cf, void *post, void *data);
static char *ngx_http_spdy_streams_index_mask(ngx_conf_t *cf, void *post,
    void *data);
static char *ngx_http_spdy_chunk_size(ngx_conf_t *cf, void *post, void *data);


static ngx_conf_num_bounds_t  ngx_http_spdy_headers_comp_bounds = {
    ngx_conf_check_num_bounds, 0, 9
};

static ngx_conf_post_t  ngx_http_spdy_recv_buffer_size_post =
    { ngx_http_spdy_recv_buffer_size };
static ngx_conf_post_t  ngx_http_spdy_pool_size_post =
    { ngx_http_spdy_pool_size };
static ngx_conf_post_t  ngx_http_spdy_streams_index_mask_post =
    { ngx_http_spdy_streams_index_mask };
static ngx_conf_post_t  ngx_http_spdy_chunk_size_post =
    { ngx_http_spdy_chunk_size };


static ngx_command_t  ngx_http_spdy_commands[] = {

    { ngx_string("spdy_recv_buffer_size"),
      NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_MAIN_CONF_OFFSET,
      offsetof(ngx_http_spdy_main_conf_t, recv_buffer_size),
      &ngx_http_spdy_recv_buffer_size_post },

    { ngx_string("spdy_pool_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_spdy_srv_conf_t, pool_size),
      &ngx_http_spdy_pool_size_post },

    { ngx_string("spdy_max_concurrent_streams"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_spdy_srv_conf_t, concurrent_streams),
      NULL },

    { ngx_string("spdy_streams_index_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_spdy_srv_conf_t, streams_index_mask),
      &ngx_http_spdy_streams_index_mask_post },

    { ngx_string("spdy_recv_timeout"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_spdy_srv_conf_t, recv_timeout),
      NULL },

    { ngx_string("spdy_keepalive_timeout"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_spdy_srv_conf_t, keepalive_timeout),
      NULL },

    { ngx_string("spdy_headers_comp"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_num_slot,
      NGX_HTTP_SRV_CONF_OFFSET,
      offsetof(ngx_http_spdy_srv_conf_t, headers_comp),
      &ngx_http_spdy_headers_comp_bounds },

    { ngx_string("spdy_chunk_size"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_spdy_loc_conf_t, chunk_size),
      &ngx_http_spdy_chunk_size_post },

      ngx_null_command
};


static ngx_http_module_t  ngx_http_spdy_module_ctx = {
    ngx_http_spdy_add_variables,           /* preconfiguration */
    NULL,                                  /* postconfiguration */

    ngx_http_spdy_create_main_conf,        /* create main configuration */
    ngx_http_spdy_init_main_conf,          /* init main configuration */

    ngx_http_spdy_create_srv_conf,         /* create server configuration */
    ngx_http_spdy_merge_srv_conf,          /* merge server configuration */

    ngx_http_spdy_create_loc_conf,         /* create location configuration */
    ngx_http_spdy_merge_loc_conf           /* merge location configuration */
};


ngx_module_t  ngx_http_spdy_module = {
    NGX_MODULE_V1,
    &ngx_http_spdy_module_ctx,             /* module context */
    ngx_http_spdy_commands,                /* module directives */
    NGX_HTTP_MODULE,                       /* module type */
    NULL,                                  /* init master */
    ngx_http_spdy_module_init,             /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static ngx_http_variable_t  ngx_http_spdy_vars[] = {

    { ngx_string("spdy"), NULL,
      ngx_http_spdy_variable, 0, 0, 0 },

    { ngx_string("spdy_request_priority"), NULL,
      ngx_http_spdy_request_priority_variable, 0, 0, 0 },

    { ngx_null_string, NULL, NULL, 0, 0, 0 }
};


static ngx_int_t
ngx_http_spdy_add_variables(ngx_conf_t *cf)
{
   ngx_http_variable_t  *var, *v;

    for (v = ngx_http_spdy_vars; v->name.len; v++) {
        var = ngx_http_add_variable(cf, &v->name, v->flags);
        if (var == NULL) {
            return NGX_ERROR;
        }

        var->get_handler = v->get_handler;
        var->data = v->data;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_http_spdy_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data)
{
    if (r->spdy_stream) {
        v->len = sizeof("3.1") - 1;
        v->valid = 1;
        v->no_cacheable = 0;
        v->not_found = 0;
        v->data = (u_char *) "3.1";

        return NGX_OK;
    }

    *v = ngx_http_variable_null_value;

    return NGX_OK;
}


static ngx_int_t
ngx_http_spdy_request_priority_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data)
{
    if (r->spdy_stream) {
        v->len = 1;
        v->valid = 1;
        v->no_cacheable = 0;
        v->not_found = 0;

        v->data = ngx_pnalloc(r->pool, 1);
        if (v->data == NULL) {
            return NGX_ERROR;
        }

        v->data[0] = '0' + (u_char) r->spdy_stream->priority;

        return NGX_OK;
    }

    *v = ngx_http_variable_null_value;

    return NGX_OK;
}


static ngx_int_t
ngx_http_spdy_module_init(ngx_cycle_t *cycle)
{
    ngx_http_spdy_request_headers_init();

    return NGX_OK;
}


static void *
ngx_http_spdy_create_main_conf(ngx_conf_t *cf)
{
    ngx_http_spdy_main_conf_t  *smcf;

    smcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_spdy_main_conf_t));
    if (smcf == NULL) {
        return NULL;
    }

    smcf->recv_buffer_size = NGX_CONF_UNSET_SIZE;

    return smcf;
}


static char *
ngx_http_spdy_init_main_conf(ngx_conf_t *cf, void *conf)
{
    ngx_http_spdy_main_conf_t *smcf = conf;

    ngx_conf_init_size_value(smcf->recv_buffer_size, 256 * 1024);

    return NGX_CONF_OK;
}


static void *
ngx_http_spdy_create_srv_conf(ngx_conf_t *cf)
{
    ngx_http_spdy_srv_conf_t  *sscf;

    sscf = ngx_pcalloc(cf->pool, sizeof(ngx_http_spdy_srv_conf_t));
    if (sscf == NULL) {
        return NULL;
    }

    sscf->pool_size = NGX_CONF_UNSET_SIZE;

    sscf->concurrent_streams = NGX_CONF_UNSET_UINT;
    sscf->streams_index_mask = NGX_CONF_UNSET_UINT;

    sscf->recv_timeout = NGX_CONF_UNSET_MSEC;
    sscf->keepalive_timeout = NGX_CONF_UNSET_MSEC;

    sscf->headers_comp = NGX_CONF_UNSET;

    return sscf;
}


static char *
ngx_http_spdy_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_http_spdy_srv_conf_t *prev = parent;
    ngx_http_spdy_srv_conf_t *conf = child;

    ngx_conf_merge_size_value(conf->pool_size, prev->pool_size, 4096);

    ngx_conf_merge_uint_value(conf->concurrent_streams,
                              prev->concurrent_streams, 100);

    ngx_conf_merge_uint_value(conf->streams_index_mask,
                              prev->streams_index_mask, 32 - 1);

    ngx_conf_merge_msec_value(conf->recv_timeout,
                              prev->recv_timeout, 30000);
    ngx_conf_merge_msec_value(conf->keepalive_timeout,
                              prev->keepalive_timeout, 180000);

    ngx_conf_merge_value(conf->headers_comp, prev->headers_comp, 0);

    return NGX_CONF_OK;
}


static void *
ngx_http_spdy_create_loc_conf(ngx_conf_t *cf)
{
    ngx_http_spdy_loc_conf_t  *slcf;

    slcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_spdy_loc_conf_t));
    if (slcf == NULL) {
        return NULL;
    }

    slcf->chunk_size = NGX_CONF_UNSET_SIZE;

    return slcf;
}


static char *
ngx_http_spdy_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_http_spdy_loc_conf_t *prev = parent;
    ngx_http_spdy_loc_conf_t *conf = child;

    ngx_conf_merge_size_value(conf->chunk_size, prev->chunk_size, 8 * 1024);

    return NGX_CONF_OK;
}


static char *
ngx_http_spdy_recv_buffer_size(ngx_conf_t *cf, void *post, void *data)
{
    size_t *sp = data;

    if (*sp <= 2 * NGX_SPDY_STATE_BUFFER_SIZE) {
        return "value is too small";
    }

    return NGX_CONF_OK;
}


static char *
ngx_http_spdy_pool_size(ngx_conf_t *cf, void *post, void *data)
{
    size_t *sp = data;

    if (*sp < NGX_MIN_POOL_SIZE) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "the pool size must be no less than %uz",
                           NGX_MIN_POOL_SIZE);
        return NGX_CONF_ERROR;
    }

    if (*sp % NGX_POOL_ALIGNMENT) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "the pool size must be a multiple of %uz",
                           NGX_POOL_ALIGNMENT);
        return NGX_CONF_ERROR;
    }

    return NGX_CONF_OK;
}


static char *
ngx_http_spdy_streams_index_mask(ngx_conf_t *cf, void *post, void *data)
{
    ngx_uint_t *np = data;

    ngx_uint_t  mask;

    mask = *np - 1;

    if (*np == 0 || (*np & mask)) {
        return "must be a power of two";
    }

    *np = mask;

    return NGX_CONF_OK;
}


static char *
ngx_http_spdy_chunk_size(ngx_conf_t *cf, void *post, void *data)
{
    size_t *sp = data;

    if (*sp == 0) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "the spdy chunk size cannot be zero");
        return NGX_CONF_ERROR;
    }

    if (*sp > NGX_SPDY_MAX_FRAME_SIZE) {
        *sp = NGX_SPDY_MAX_FRAME_SIZE;
    }

    return NGX_CONF_OK;
}