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ngx_event_pipe.c
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_event_pipe.h>
static ngx_int_t ngx_event_pipe_read_upstream(ngx_event_pipe_t *p);
static ngx_int_t ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p);
static ngx_int_t ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p);
static ngx_inline void ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf);
static ngx_int_t ngx_event_pipe_drain_chains(ngx_event_pipe_t *p);
ngx_int_t
ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write)
{
ngx_int_t rc;
ngx_uint_t flags;
ngx_event_t *rev, *wev;
for ( ;; ) {
if (do_write) {
p->log->action = "sending to client";
rc = ngx_event_pipe_write_to_downstream(p);
if (rc == NGX_ABORT) {
return NGX_ABORT;
}
if (rc == NGX_BUSY) {
return NGX_OK;
}
}
p->read = 0;
p->upstream_blocked = 0;
p->log->action = "reading upstream";
if (ngx_event_pipe_read_upstream(p) == NGX_ABORT) {
return NGX_ABORT;
}
if (!p->read && !p->upstream_blocked) {
break;
}
do_write = 1;
}
if (p->upstream->fd != (ngx_socket_t) -1) {
rev = p->upstream->read;
flags = (rev->eof || rev->error) ? NGX_CLOSE_EVENT : 0;
if (ngx_handle_read_event(rev, flags) != NGX_OK) {
return NGX_ABORT;
}
if (!rev->delayed) {
if (rev->active && !rev->ready) {
ngx_add_timer(rev, p->read_timeout);
} else if (rev->timer_set) {
ngx_del_timer(rev);
}
}
}
if (p->downstream->fd != (ngx_socket_t) -1
&& p->downstream->data == p->output_ctx)
{
wev = p->downstream->write;
if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) {
return NGX_ABORT;
}
if (!wev->delayed) {
if (wev->active && !wev->ready) {
ngx_add_timer(wev, p->send_timeout);
} else if (wev->timer_set) {
ngx_del_timer(wev);
}
}
}
return NGX_OK;
}
static ngx_int_t
ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
{
off_t limit;
ssize_t n, size;
ngx_int_t rc;
ngx_buf_t *b;
ngx_msec_t delay;
ngx_chain_t *chain, *cl, *ln;
if (p->upstream_eof || p->upstream_error || p->upstream_done) {
return NGX_OK;
}
#if (NGX_THREADS)
if (p->aio) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe read upstream: aio");
return NGX_AGAIN;
}
if (p->writing) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe read upstream: writing");
rc = ngx_event_pipe_write_chain_to_temp_file(p);
if (rc != NGX_OK) {
return rc;
}
}
#endif
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe read upstream: %d", p->upstream->read->ready);
for ( ;; ) {
if (p->upstream_eof || p->upstream_error || p->upstream_done) {
break;
}
if (p->preread_bufs == NULL && !p->upstream->read->ready) {
break;
}
if (p->preread_bufs) {
/* use the pre-read bufs if they exist */
chain = p->preread_bufs;
p->preread_bufs = NULL;
n = p->preread_size;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe preread: %z", n);
if (n) {
p->read = 1;
}
} else {
#if (NGX_HAVE_KQUEUE)
/*
* kqueue notifies about the end of file or a pending error.
* This test allows not to allocate a buf on these conditions
* and not to call c->recv_chain().
*/
if (p->upstream->read->available == 0
&& p->upstream->read->pending_eof
#if (NGX_SSL)
&& !p->upstream->ssl
#endif
)
{
p->upstream->read->ready = 0;
p->upstream->read->eof = 1;
p->upstream_eof = 1;
p->read = 1;
if (p->upstream->read->kq_errno) {
p->upstream->read->error = 1;
p->upstream_error = 1;
p->upstream_eof = 0;
ngx_log_error(NGX_LOG_ERR, p->log,
p->upstream->read->kq_errno,
"kevent() reported that upstream "
"closed connection");
}
break;
}
#endif
if (p->limit_rate) {
if (p->upstream->read->delayed) {
break;
}
limit = (off_t) p->limit_rate * (ngx_time() - p->start_sec + 1)
- p->read_length;
if (limit <= 0) {
p->upstream->read->delayed = 1;
delay = (ngx_msec_t) (- limit * 1000 / p->limit_rate + 1);
ngx_add_timer(p->upstream->read, delay);
break;
}
} else {
limit = 0;
}
if (p->free_raw_bufs) {
/* use the free bufs if they exist */
chain = p->free_raw_bufs;
if (p->single_buf) {
p->free_raw_bufs = p->free_raw_bufs->next;
chain->next = NULL;
} else {
p->free_raw_bufs = NULL;
}
} else if (p->allocated < p->bufs.num) {
/* allocate a new buf if it's still allowed */
b = ngx_create_temp_buf(p->pool, p->bufs.size);
if (b == NULL) {
return NGX_ABORT;
}
p->allocated++;
chain = ngx_alloc_chain_link(p->pool);
if (chain == NULL) {
return NGX_ABORT;
}
chain->buf = b;
chain->next = NULL;
} else if (!p->cacheable
&& p->downstream->data == p->output_ctx
&& p->downstream->write->ready
&& !p->downstream->write->delayed)
{
/*
* if the bufs are not needed to be saved in a cache and
* a downstream is ready then write the bufs to a downstream
*/
p->upstream_blocked = 1;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe downstream ready");
break;
} else if (p->cacheable
|| p->temp_file->offset < p->max_temp_file_size)
{
/*
* if it is allowed, then save some bufs from p->in
* to a temporary file, and add them to a p->out chain
*/
rc = ngx_event_pipe_write_chain_to_temp_file(p);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe temp offset: %O", p->temp_file->offset);
if (rc == NGX_BUSY) {
break;
}
if (rc != NGX_OK) {
return rc;
}
chain = p->free_raw_bufs;
if (p->single_buf) {
p->free_raw_bufs = p->free_raw_bufs->next;
chain->next = NULL;
} else {
p->free_raw_bufs = NULL;
}
} else {
/* there are no bufs to read in */
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"no pipe bufs to read in");
break;
}
n = p->upstream->recv_chain(p->upstream, chain, limit);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe recv chain: %z", n);
if (p->free_raw_bufs) {
chain->next = p->free_raw_bufs;
}
p->free_raw_bufs = chain;
if (n == NGX_ERROR) {
p->upstream_error = 1;
break;
}
if (n == NGX_AGAIN) {
if (p->single_buf) {
ngx_event_pipe_remove_shadow_links(chain->buf);
}
break;
}
p->read = 1;
if (n == 0) {
p->upstream_eof = 1;
break;
}
}
delay = p->limit_rate ? (ngx_msec_t) n * 1000 / p->limit_rate : 0;
p->read_length += n;
cl = chain;
p->free_raw_bufs = NULL;
while (cl && n > 0) {
ngx_event_pipe_remove_shadow_links(cl->buf);
size = cl->buf->end - cl->buf->last;
if (n >= size) {
cl->buf->last = cl->buf->end;
/* STUB */ cl->buf->num = p->num++;
if (p->input_filter(p, cl->buf) == NGX_ERROR) {
return NGX_ABORT;
}
n -= size;
ln = cl;
cl = cl->next;
ngx_free_chain(p->pool, ln);
} else {
cl->buf->last += n;
n = 0;
}
}
if (cl) {
for (ln = cl; ln->next; ln = ln->next) { /* void */ }
ln->next = p->free_raw_bufs;
p->free_raw_bufs = cl;
}
if (delay > 0) {
p->upstream->read->delayed = 1;
ngx_add_timer(p->upstream->read, delay);
break;
}
}
#if (NGX_DEBUG)
for (cl = p->busy; cl; cl = cl->next) {
ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe buf busy s:%d t:%d f:%d "
"%p, pos %p, size: %z "
"file: %O, size: %O",
(cl->buf->shadow ? 1 : 0),
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);
}
for (cl = p->out; cl; cl = cl->next) {
ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe buf out s:%d t:%d f:%d "
"%p, pos %p, size: %z "
"file: %O, size: %O",
(cl->buf->shadow ? 1 : 0),
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);
}
for (cl = p->in; cl; cl = cl->next) {
ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe buf in s:%d t:%d f:%d "
"%p, pos %p, size: %z "
"file: %O, size: %O",
(cl->buf->shadow ? 1 : 0),
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);
}
for (cl = p->free_raw_bufs; cl; cl = cl->next) {
ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe buf free s:%d t:%d f:%d "
"%p, pos %p, size: %z "
"file: %O, size: %O",
(cl->buf->shadow ? 1 : 0),
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);
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe length: %O", p->length);
#endif
if (p->free_raw_bufs && p->length != -1) {
cl = p->free_raw_bufs;
if (cl->buf->last - cl->buf->pos >= p->length) {
p->free_raw_bufs = cl->next;
/* STUB */ cl->buf->num = p->num++;
if (p->input_filter(p, cl->buf) == NGX_ERROR) {
return NGX_ABORT;
}
ngx_free_chain(p->pool, cl);
}
}
if (p->length == 0) {
p->upstream_done = 1;
p->read = 1;
}
if ((p->upstream_eof || p->upstream_error) && p->free_raw_bufs) {
/* STUB */ p->free_raw_bufs->buf->num = p->num++;
if (p->input_filter(p, p->free_raw_bufs->buf) == NGX_ERROR) {
return NGX_ABORT;
}
p->free_raw_bufs = p->free_raw_bufs->next;
if (p->free_bufs && p->buf_to_file == NULL) {
for (cl = p->free_raw_bufs; cl; cl = cl->next) {
if (cl->buf->shadow == NULL) {
ngx_pfree(p->pool, cl->buf->start);
}
}
}
}
if (p->cacheable && (p->in || p->buf_to_file)) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write chain");
rc = ngx_event_pipe_write_chain_to_temp_file(p);
if (rc != NGX_OK) {
return rc;
}
}
return NGX_OK;
}
static ngx_int_t
ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p)
{
u_char *prev;
size_t bsize;
ngx_int_t rc;
ngx_uint_t flush, flushed, prev_last_shadow;
ngx_chain_t *out, **ll, *cl;
ngx_connection_t *downstream;
downstream = p->downstream;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write downstream: %d", downstream->write->ready);
#if (NGX_THREADS)
if (p->writing) {
rc = ngx_event_pipe_write_chain_to_temp_file(p);
if (rc == NGX_ABORT) {
return NGX_ABORT;
}
}
#endif
flushed = 0;
for ( ;; ) {
if (p->downstream_error) {
return ngx_event_pipe_drain_chains(p);
}
if (p->upstream_eof || p->upstream_error || p->upstream_done) {
/* pass the p->out and p->in chains to the output filter */
for (cl = p->busy; cl; cl = cl->next) {
cl->buf->recycled = 0;
}
if (p->out) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write downstream flush out");
for (cl = p->out; cl; cl = cl->next) {
cl->buf->recycled = 0;
}
rc = p->output_filter(p->output_ctx, p->out);
if (rc == NGX_ERROR) {
p->downstream_error = 1;
return ngx_event_pipe_drain_chains(p);
}
p->out = NULL;
}
if (p->writing) {
break;
}
if (p->in) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write downstream flush in");
for (cl = p->in; cl; cl = cl->next) {
cl->buf->recycled = 0;
}
rc = p->output_filter(p->output_ctx, p->in);
if (rc == NGX_ERROR) {
p->downstream_error = 1;
return ngx_event_pipe_drain_chains(p);
}
p->in = NULL;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write downstream done");
/* TODO: free unused bufs */
p->downstream_done = 1;
break;
}
if (downstream->data != p->output_ctx
|| !downstream->write->ready
|| downstream->write->delayed)
{
break;
}
/* bsize is the size of the busy recycled bufs */
prev = NULL;
bsize = 0;
for (cl = p->busy; cl; cl = cl->next) {
if (cl->buf->recycled) {
if (prev == cl->buf->start) {
continue;
}
bsize += cl->buf->end - cl->buf->start;
prev = cl->buf->start;
}
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write busy: %uz", bsize);
out = NULL;
if (bsize >= (size_t) p->busy_size) {
flush = 1;
goto flush;
}
flush = 0;
ll = NULL;
prev_last_shadow = 1;
for ( ;; ) {
if (p->out) {
cl = p->out;
if (cl->buf->recycled) {
ngx_log_error(NGX_LOG_ALERT, p->log, 0,
"recycled buffer in pipe out chain");
}
p->out = p->out->next;
} else if (!p->cacheable && !p->writing && p->in) {
cl = p->in;
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write buf ls:%d %p %z",
cl->buf->last_shadow,
cl->buf->pos,
cl->buf->last - cl->buf->pos);
if (cl->buf->recycled && prev_last_shadow) {
if (bsize + cl->buf->end - cl->buf->start > p->busy_size) {
flush = 1;
break;
}
bsize += cl->buf->end - cl->buf->start;
}
prev_last_shadow = cl->buf->last_shadow;
p->in = p->in->next;
} else {
break;
}
cl->next = NULL;
if (out) {
*ll = cl;
} else {
out = cl;
}
ll = &cl->next;
}
flush:
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe write: out:%p, f:%ui", out, flush);
if (out == NULL) {
if (!flush) {
break;
}
/* a workaround for AIO */
if (flushed++ > 10) {
return NGX_BUSY;
}
}
rc = p->output_filter(p->output_ctx, out);
ngx_chain_update_chains(p->pool, &p->free, &p->busy, &out, p->tag);
if (rc == NGX_ERROR) {
p->downstream_error = 1;
return ngx_event_pipe_drain_chains(p);
}
for (cl = p->free; cl; cl = cl->next) {
if (cl->buf->temp_file) {
if (p->cacheable || !p->cyclic_temp_file) {
continue;
}
/* reset p->temp_offset if all bufs had been sent */
if (cl->buf->file_last == p->temp_file->offset) {
p->temp_file->offset = 0;
}
}
/* TODO: free buf if p->free_bufs && upstream done */
/* add the free shadow raw buf to p->free_raw_bufs */
if (cl->buf->last_shadow) {
if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) {
return NGX_ABORT;
}
cl->buf->last_shadow = 0;
}
cl->buf->shadow = NULL;
}
}
return NGX_OK;
}
static ngx_int_t
ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p)
{
ssize_t size, bsize, n;
ngx_buf_t *b;
ngx_uint_t prev_last_shadow;
ngx_chain_t *cl, *tl, *next, *out, **ll, **last_out, **last_free;
#if (NGX_THREADS)
if (p->writing) {
if (p->aio) {
return NGX_AGAIN;
}
out = p->writing;
p->writing = NULL;
n = ngx_write_chain_to_temp_file(p->temp_file, NULL);
if (n == NGX_ERROR) {
return NGX_ABORT;
}
goto done;
}
#endif
if (p->buf_to_file) {
out = ngx_alloc_chain_link(p->pool);
if (out == NULL) {
return NGX_ABORT;
}
out->buf = p->buf_to_file;
out->next = p->in;
} else {
out = p->in;
}
if (!p->cacheable) {
size = 0;
cl = out;
ll = NULL;
prev_last_shadow = 1;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe offset: %O", p->temp_file->offset);
do {
bsize = cl->buf->last - cl->buf->pos;
ngx_log_debug4(NGX_LOG_DEBUG_EVENT, p->log, 0,
"pipe buf ls:%d %p, pos %p, size: %z",
cl->buf->last_shadow, cl->buf->start,
cl->buf->pos, bsize);
if (prev_last_shadow
&& ((size + bsize > p->temp_file_write_size)
|| (p->temp_file->offset + size + bsize
> p->max_temp_file_size)))
{
break;
}
prev_last_shadow = cl->buf->last_shadow;
size += bsize;
ll = &cl->next;
cl = cl->next;
} while (cl);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "size: %z", size);
if (ll == NULL) {
return NGX_BUSY;
}
if (cl) {
p->in = cl;
*ll = NULL;
} else {
p->in = NULL;
p->last_in = &p->in;
}
} else {
p->in = NULL;
p->last_in = &p->in;
}
#if (NGX_THREADS)
if (p->thread_handler) {
p->temp_file->thread_write = 1;
p->temp_file->file.thread_task = p->thread_task;
p->temp_file->file.thread_handler = p->thread_handler;
p->temp_file->file.thread_ctx = p->thread_ctx;
}
#endif
n = ngx_write_chain_to_temp_file(p->temp_file, out);
if (n == NGX_ERROR) {
return NGX_ABORT;
}
#if (NGX_THREADS)
if (n == NGX_AGAIN) {
p->writing = out;
p->thread_task = p->temp_file->file.thread_task;
return NGX_AGAIN;
}
done:
#endif
if (p->buf_to_file) {
p->temp_file->offset = p->buf_to_file->last - p->buf_to_file->pos;
n -= p->buf_to_file->last - p->buf_to_file->pos;
p->buf_to_file = NULL;
out = out->next;
}
if (n > 0) {
/* update previous buffer or add new buffer */
if (p->out) {
for (cl = p->out; cl->next; cl = cl->next) { /* void */ }
b = cl->buf;
if (b->file_last == p->temp_file->offset) {
p->temp_file->offset += n;
b->file_last = p->temp_file->offset;
goto free;
}
last_out = &cl->next;
} else {
last_out = &p->out;
}
cl = ngx_chain_get_free_buf(p->pool, &p->free);
if (cl == NULL) {
return NGX_ABORT;
}
b = cl->buf;
ngx_memzero(b, sizeof(ngx_buf_t));
b->tag = p->tag;
b->file = &p->temp_file->file;
b->file_pos = p->temp_file->offset;
p->temp_file->offset += n;
b->file_last = p->temp_file->offset;
b->in_file = 1;
b->temp_file = 1;
*last_out = cl;
}
free:
for (last_free = &p->free_raw_bufs;
*last_free != NULL;
last_free = &(*last_free)->next)
{
/* void */
}
for (cl = out; cl; cl = next) {
next = cl->next;
cl->next = p->free;
p->free = cl;
b = cl->buf;
if (b->last_shadow) {
tl = ngx_alloc_chain_link(p->pool);
if (tl == NULL) {
return NGX_ABORT;
}
tl->buf = b->shadow;
tl->next = NULL;
*last_free = tl;
last_free = &tl->next;
b->shadow->pos = b->shadow->start;
b->shadow->last = b->shadow->start;
ngx_event_pipe_remove_shadow_links(b->shadow);
}
}
return NGX_OK;
}
/* the copy input filter */
ngx_int_t
ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
{
ngx_buf_t *b;
ngx_chain_t *cl;
if (buf->pos == buf->last) {
return NGX_OK;
}
if (p->upstream_done) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
"input data after close");
return NGX_OK;
}
if (p->length == 0) {
p->upstream_done = 1;
ngx_log_error(NGX_LOG_WARN, p->log, 0,
"upstream sent more data than specified in "
"\"Content-Length\" header");
return NGX_OK;
}
cl = ngx_chain_get_free_buf(p->pool, &p->free);
if (cl == NULL) {
return NGX_ERROR;
}
b = cl->buf;
ngx_memcpy(b, buf, sizeof(ngx_buf_t));
b->shadow = buf;
b->tag = p->tag;
b->last_shadow = 1;
b->recycled = 1;
buf->shadow = b;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "input buf #%d", b->num);
if (p->in) {
*p->last_in = cl;
} else {
p->in = cl;
}
p->last_in = &cl->next;