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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_http.h>
static ngx_int_t ngx_http_write_filter_init(ngx_cycle_t *cycle);
ngx_http_module_t ngx_http_write_filter_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
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_V1,
&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)
{
off_t size, sent;
ngx_uint_t last, flush;
ngx_chain_t *cl, *ln, **ll, *chain;
ngx_connection_t *c;
ngx_http_core_loc_conf_t *clcf;
size = 0;
flush = 0;
last = 0;
ll = &r->out;
/* find the size, the flush point and the last link of the saved chain */
for (cl = r->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 "
"t:%d r:%d f:%d %p %p-%p %p %O-%O",
cl->buf->temporary,
cl->buf->recycled,
cl->buf->in_file,
cl->buf->start,
cl->buf->pos,
cl->buf->last,
cl->buf->file,
cl->buf->file_pos,
cl->buf->file_last);
ngx_debug_point();
return NGX_ERROR;
}
#endif
size += ngx_buf_size(cl->buf);
if (cl->buf->flush || cl->buf->recycled) {
flush = 1;
}
if (cl->buf->last_buf) {
last = 1;
}
}
/* add the new chain to the existent one */
for (ln = in; ln; ln = ln->next) {
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
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 "
"t:%d r:%d f:%d %p %p-%p %p %O-%O",
cl->buf->temporary,
cl->buf->recycled,
cl->buf->in_file,
cl->buf->start,
cl->buf->pos,
cl->buf->last,
cl->buf->file,
cl->buf->file_pos,
cl->buf->file_last);
ngx_debug_point();
return NGX_ERROR;
}
#endif
size += ngx_buf_size(cl->buf);
if (cl->buf->flush || cl->buf->recycled) {
flush = 1;
}
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:%d s:%O", last, flush, size);
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
/*
* avoid the output if there are 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 && in && size < (off_t) clcf->postpone_output) {
return NGX_OK;
}
#if 0
/*
* avoid the output if there are no incoming bufs but there are
* the postponed requests or data
*/
if (in == NULL && r->postponed) {
return NGX_OK;
}
#endif
if (c->write->delayed) {
return NGX_AGAIN;
}
if (size == 0 && !c->buffered) {
if (last) {
r->out = NULL;
return NGX_OK;
}
if (flush) {
do {
r->out = r->out->next;
}
while (r->out);
return NGX_OK;
}
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"the http output chain is empty");
ngx_debug_point();
return NGX_ERROR;
}
sent = c->sent;
chain = c->send_chain(c, r->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;
}
for (cl = r->out; cl && cl != chain; /* void */) {
ln = cl;
cl = cl->next;
ngx_free_chain(r->pool, ln);
}
r->out = chain;
if (chain || (last && 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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