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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_stream.h>
typedef struct {
ngx_chain_t *from_upstream;
ngx_chain_t *from_downstream;
} ngx_stream_write_filter_ctx_t;
static ngx_int_t ngx_stream_write_filter(ngx_stream_session_t *s,
ngx_chain_t *in, ngx_uint_t from_upstream);
static ngx_int_t ngx_stream_write_filter_init(ngx_conf_t *cf);
static ngx_stream_module_t ngx_stream_write_filter_module_ctx = {
NULL, /* preconfiguration */
ngx_stream_write_filter_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL /* merge server configuration */
};
ngx_module_t ngx_stream_write_filter_module = {
NGX_MODULE_V1,
&ngx_stream_write_filter_module_ctx, /* module context */
NULL, /* module directives */
NGX_STREAM_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_int_t
ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in,
ngx_uint_t from_upstream)
{
off_t size;
ngx_uint_t last, flush, sync;
ngx_chain_t *cl, *ln, **ll, **out, *chain;
ngx_connection_t *c;
ngx_stream_write_filter_ctx_t *ctx;
ctx = ngx_stream_get_module_ctx(s, ngx_stream_write_filter_module);
if (ctx == NULL) {
ctx = ngx_pcalloc(s->connection->pool,
sizeof(ngx_stream_write_filter_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
ngx_stream_set_ctx(s, ctx, ngx_stream_write_filter_module);
}
if (from_upstream) {
c = s->connection;
out = &ctx->from_upstream;
} else {
c = s->upstream->peer.connection;
out = &ctx->from_downstream;
}
if (c->error) {
return NGX_ERROR;
}
size = 0;
flush = 0;
sync = 0;
last = 0;
ll = out;
/* find the size, the flush point and the last link of the saved chain */
for (cl = *out; cl; cl = cl->next) {
ll = &cl->next;
ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
"write old buf t:%d f:%d %p, pos %p, size: %z "
"file: %O, size: %O",
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, c->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->sync) {
sync = 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(c->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = ln->buf;
*ll = cl;
ll = &cl->next;
ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
"write new buf t:%d f:%d %p, pos %p, size: %z "
"file: %O, size: %O",
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, c->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->sync) {
sync = 1;
}
if (cl->buf->last_buf) {
last = 1;
}
}
*ll = NULL;
ngx_log_debug3(NGX_LOG_DEBUG_STREAM, c->log, 0,
"stream write filter: l:%ui f:%ui s:%O", last, flush, size);
if (size == 0
&& !(c->buffered & NGX_LOWLEVEL_BUFFERED)
&& !(last && c->need_last_buf))
{
if (last || flush || sync) {
for (cl = *out; cl; /* void */) {
ln = cl;
cl = cl->next;
ngx_free_chain(c->pool, ln);
}
*out = NULL;
c->buffered &= ~NGX_STREAM_WRITE_BUFFERED;
return NGX_OK;
}
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"the stream output chain is empty");
ngx_debug_point();
return NGX_ERROR;
}
chain = c->send_chain(c, *out, 0);
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0,
"stream write filter %p", chain);
if (chain == NGX_CHAIN_ERROR) {
c->error = 1;
return NGX_ERROR;
}
for (cl = *out; cl && cl != chain; /* void */) {
ln = cl;
cl = cl->next;
ngx_free_chain(c->pool, ln);
}
*out = chain;
if (chain) {
if (c->shared) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"shared connection is busy");
return NGX_ERROR;
}
c->buffered |= NGX_STREAM_WRITE_BUFFERED;
return NGX_AGAIN;
}
c->buffered &= ~NGX_STREAM_WRITE_BUFFERED;
if (c->buffered & NGX_LOWLEVEL_BUFFERED) {
return NGX_AGAIN;
}
return NGX_OK;
}
static ngx_int_t
ngx_stream_write_filter_init(ngx_conf_t *cf)
{
ngx_stream_top_filter = ngx_stream_write_filter;
return NGX_OK;
}
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