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view src/http/ngx_http_spdy_module.c @ 5520:a336cbc3dd44

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SPDY: send output queue after processing of read event. During the processing of input some control frames can be added to the queue. And if there were no writing streams at the moment, these control frames might be left unsent for a long time (or even forever). This long delay is especially critical for PING replies since a client can consider connection as broken and then resend exactly the same request over a new connection, which is not safe in case of non-idempotent HTTP methods.
author Valentin Bartenev <vbart@nginx.com>
date Wed, 15 Jan 2014 17:16:38 +0400
parents e5fb14e85040
children 39d7eef2e332
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 = 1;
        v->valid = 1;
        v->no_cacheable = 0;
        v->not_found = 0;
        v->data = (u_char *) "2";

        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;

    if (smcf->recv_buffer_size == NGX_CONF_UNSET_SIZE) {
        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;
}