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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_http.h>
typedef struct {
ngx_chain_t *out;
} ngx_http_write_filter_ctx_t;
static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle);
ngx_http_module_t ngx_http_write_filter_module_ctx = {
NULL, /* pre conf */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL, /* merge location configuration */
};
ngx_module_t ngx_http_write_filter_module = {
NGX_MODULE,
&ngx_http_write_filter_module_ctx, /* module context */
NULL, /* module directives */
NGX_HTTP_MODULE, /* module type */
ngx_http_write_filter_init, /* init module */
NULL /* init process */
};
ngx_int_t ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
int last;
off_t size, flush, sent;
ngx_chain_t *cl, *ln, **ll, *chain;
ngx_connection_t *c;
ngx_http_core_loc_conf_t *clcf;
ngx_http_write_filter_ctx_t *ctx;
ctx = ngx_http_get_module_ctx(r->main ? r->main : r,
ngx_http_write_filter_module);
if (ctx == NULL) {
ngx_http_create_ctx(r, ctx, ngx_http_write_filter_module,
sizeof(ngx_http_write_filter_ctx_t), NGX_ERROR);
}
size = 0;
flush = 0;
last = 0;
ll = &ctx->out;
/* find the size, the flush point and the last link of the saved chain */
for (cl = ctx->out; cl; cl = cl->next) {
ll = &cl->next;
ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
"write old buf t:%d f:%d %p, pos %p, size: %z "
"file: %O, size: %z",
cl->buf->temporary, cl->buf->in_file,
cl->buf->start, cl->buf->pos,
cl->buf->last - cl->buf->pos,
cl->buf->file_pos,
cl->buf->file_last - cl->buf->file_pos);
#if 1
if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"zero size buf in writer");
ngx_debug_point();
}
#endif
size += ngx_buf_size(cl->buf);
if (cl->buf->flush || cl->buf->recycled) {
flush = size;
}
if (cl->buf->last_buf) {
last = 1;
}
}
/* add the new chain to the existent one */
for (ln = in; ln; ln = ln->next) {
if (!(cl = ngx_alloc_chain_link(r->pool))) {
return NGX_ERROR;
}
cl->buf = ln->buf;
*ll = cl;
ll = &cl->next;
ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
"write new buf t:%d f:%d %p, pos %p, size: %z "
"file: %O, size: %z",
cl->buf->temporary, cl->buf->in_file,
cl->buf->start, cl->buf->pos,
cl->buf->last - cl->buf->pos,
cl->buf->file_pos,
cl->buf->file_last - cl->buf->file_pos);
#if 1
if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"zero size buf in writer");
ngx_debug_point();
}
#endif
size += ngx_buf_size(cl->buf);
if (cl->buf->flush || cl->buf->recycled) {
flush = size;
}
if (cl->buf->last_buf) {
last = 1;
}
}
*ll = NULL;
c = r->connection;
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http write filter: l:%d f:%O s:%O", last, flush, size);
clcf = ngx_http_get_module_loc_conf(r->main ? r->main : r,
ngx_http_core_module);
/*
* avoid the output if there is no last buf, no flush point,
* there are the incoming bufs and the size of all bufs
* is smaller than "postpone_output" directive
*/
if (!last && flush == 0 && in && size < (off_t) clcf->postpone_output) {
return NGX_OK;
}
if (c->write->delayed) {
return NGX_AGAIN;
}
if (size == 0 && !c->buffered) {
if (!last) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"the http output chain is empty");
ngx_debug_point();
return NGX_ERROR;
}
return NGX_OK;
}
sent = c->sent;
chain = c->send_chain(c, ctx->out, clcf->limit_rate);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http write filter %p", chain);
if (clcf->limit_rate) {
sent = c->sent - sent;
c->write->delayed = 1;
ngx_add_timer(r->connection->write,
(ngx_msec_t) (sent * 1000 / clcf->limit_rate));
}
if (chain == NGX_CHAIN_ERROR) {
return NGX_ERROR;
}
ctx->out = chain;
if (chain || c->buffered) {
return NGX_AGAIN;
}
return NGX_OK;
}
static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle)
{
ngx_http_top_body_filter = ngx_http_write_filter;
return NGX_OK;
}
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