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ngx_http_mass_chunk_module.c
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ngx_http_mass_chunk_module.c
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/**
* Copyright (C) 2011 Matthieu Tourne
* @author Matthieu Tourne <matthieu@cloudflare.com>
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
typedef struct {
ngx_flag_t enable;
size_t max_size;
size_t max_chunks;
} ngx_http_mass_chunk_loc_conf_t;
typedef struct {
/* IO */
ngx_chain_t *free;
ngx_chain_t *busy;
ngx_chain_t *out;
ngx_chain_t **last_out;
} ngx_http_mass_chunk_ctx_t;
static ngx_int_t ngx_http_mass_chunk_init(ngx_conf_t *cf);
static ngx_int_t ngx_http_mass_chunk_header_filter(ngx_http_request_t *r);
static ngx_int_t ngx_http_mass_chunk_body_filter(ngx_http_request_t *r,
ngx_chain_t *in);
static void *ngx_http_mass_chunk_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_mass_chunk_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_command_t ngx_http_mass_chunk_commands[] = {
{ ngx_string("mass_chunk"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF
|NGX_HTTP_LIF_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_mass_chunk_loc_conf_t, enable),
NULL },
{ ngx_string("mass_chunk_max_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF
|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_mass_chunk_loc_conf_t, max_size),
NULL },
{ ngx_string("mass_chunk_max_chunks"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF
|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_mass_chunk_loc_conf_t, max_chunks),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_mass_chunk_module_ctx = {
NULL, /* preconfiguration */
ngx_http_mass_chunk_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_mass_chunk_create_loc_conf,/* create location configuration */
ngx_http_mass_chunk_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_mass_chunk_module = {
NGX_MODULE_V1,
&ngx_http_mass_chunk_module_ctx, /* module context */
ngx_http_mass_chunk_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
static ngx_int_t ngx_http_mass_chunk_header_filter(ngx_http_request_t *r) {
ngx_http_mass_chunk_loc_conf_t *lcf;
ngx_http_mass_chunk_ctx_t *ctx;
lcf = ngx_http_get_module_loc_conf(r, ngx_http_mass_chunk_module);
if (!lcf->enable || !lcf->max_size) {
return ngx_http_next_header_filter(r);
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"massive chunker filter");
ctx = ngx_pcalloc(r->pool, sizeof (ngx_http_mass_chunk_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
ctx->last_out = &ctx->out;
ngx_http_set_ctx(r, ctx, ngx_http_mass_chunk_module);
/* loads the content of the response in : in->buf */
r->filter_need_in_memory = 1;
return ngx_http_next_header_filter(r);
}
static ngx_int_t
ngx_http_mass_chunk_body_filter(ngx_http_request_t *r, ngx_chain_t *in) {
ngx_http_mass_chunk_loc_conf_t *lcf;
ngx_http_mass_chunk_ctx_t *ctx;
ngx_chain_t *cl;
u_char *copy_start;
u_char *copy_end;
ngx_buf_t *b;
ngx_int_t rc;
ngx_int_t num;
ctx = ngx_http_get_module_ctx(r, ngx_http_mass_chunk_module);
if (ctx == NULL) {
return ngx_http_next_body_filter(r, in);
}
lcf = ngx_http_get_module_loc_conf(r, ngx_http_mass_chunk_module);
num = 1;
while (in) {
copy_start = in->buf->pos;
copy_end = in->buf->pos;
b = NULL;
while (copy_end < in->buf->last) {
copy_start = copy_end;
if (copy_start > in->buf->last) {
return NGX_ERROR;
}
copy_end = ngx_min(copy_start + lcf->max_size, in->buf->last);
/* create buf */
cl = ngx_chain_get_free_buf(r->pool, &ctx->free);
if (cl == NULL) {
return NGX_ERROR;
}
b = cl->buf;
/* copy attributes */
ngx_memcpy(b, in->buf, sizeof(ngx_buf_t));
b->pos = copy_start;
b->last = copy_end;
b->shadow = NULL;
b->last_buf = 0;
b->recycled = 0;
/* b->flush = 1; */
if (b->in_file) {
b->file_last = b->file_pos + (b->last - in->buf->pos);
b->file_pos += b->pos - in->buf->pos;
}
*ctx->last_out = cl;
ctx->last_out = &cl->next;
if (lcf->max_chunks && num++ % lcf->max_chunks == 0) {
if (ngx_http_next_body_filter(r, ctx->out) != NGX_OK) {
return NGX_ERROR;
}
ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &ctx->out,
(ngx_buf_tag_t) &ngx_http_mass_chunk_module);
ctx->last_out = &ctx->out;
}
}
if (in->buf->last_buf) {
cl = ngx_chain_get_free_buf(r->pool, &ctx->free);
if (cl == NULL) {
return NGX_ERROR;
}
b = cl->buf;
*ctx->last_out = cl;
ctx->last_out = &cl->next;
b->last_buf = 1;
}
in->buf->pos = in->buf->last;
in->buf->file_pos = in->buf->file_last;
in = in->next;
}
if (ctx->out == NULL && ctx->busy == NULL) {
return NGX_OK;
}
rc = ngx_http_next_body_filter(r, ctx->out);
ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &ctx->out,
(ngx_buf_tag_t) &ngx_http_mass_chunk_module);
ctx->last_out = &ctx->out;
return rc;
}
static void*
ngx_http_mass_chunk_create_loc_conf(ngx_conf_t *cf) {
ngx_http_mass_chunk_loc_conf_t *lcf;
lcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_mass_chunk_loc_conf_t));
if (lcf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc():
*
*/
lcf->enable = NGX_CONF_UNSET;
lcf->max_size = NGX_CONF_UNSET_SIZE;
lcf->max_chunks = NGX_CONF_UNSET_SIZE;
return lcf;
}
static char*
ngx_http_mass_chunk_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) {
ngx_http_mass_chunk_loc_conf_t *prev = parent;
ngx_http_mass_chunk_loc_conf_t *conf = child;
ngx_conf_merge_value(conf->enable, prev->enable, 0);
ngx_conf_merge_size_value(conf->max_size, prev->max_size, 10);
ngx_conf_merge_size_value(conf->max_chunks, prev->max_chunks, 0);
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_mass_chunk_init(ngx_conf_t *cf) {
ngx_http_next_header_filter = ngx_http_top_header_filter;
ngx_http_top_header_filter = ngx_http_mass_chunk_header_filter;
ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_mass_chunk_body_filter;
return NGX_OK;
}