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SPDY: fixed possible request hang.

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Processing events from upstream connection can result in sending queued frames
from other streams.  In this case such streams were not added to handling queue
and properly handled.

A global per connection flag was replaced by a per stream flag that indicates
currently sending stream while all other streams can be added to handling
queue.
This commit is contained in:
Valentin Bartenev 2013-12-26 17:03:16 +04:00
parent 9b4a99cf5d
commit 75dad742e5
3 changed files with 23 additions and 11 deletions
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17
src/http/ngx_http_spdy.c
View File

@ -411,7 +411,7 @@ ngx_http_spdy_write_handler(ngx_event_t *wev)
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "spdy write handler");
sc->blocked = 2;
sc->blocked = 1;
rc = ngx_http_spdy_send_output_queue(sc);
@ -430,8 +430,6 @@ ngx_http_spdy_write_handler(ngx_event_t *wev)
sc->last_stream = NULL;
sc->blocked = 1;
for ( /* void */ ; stream; stream = sn) {
sn = stream->next;
stream->handled = 0;
@ -2658,6 +2656,15 @@ ngx_http_spdy_close_stream(ngx_http_spdy_stream_t *stream, ngx_int_t rc)
}
}
if (stream->handled) {
for (s = sc->last_stream; s; s = s->next) {
if (s->next == stream) {
s->next = stream->next;
break;
}
}
}
sscf = ngx_http_get_module_srv_conf(sc->http_connection->conf_ctx,
ngx_http_spdy_module);
@ -2847,9 +2854,11 @@ ngx_http_spdy_finalize_connection(ngx_http_spdy_connection_t *sc,
stream = sc->streams_index[i];
while (stream) {
r = stream->request;
stream->handled = 0;
r = stream->request;
fc = r->connection;
fc->error = 1;
if (stream->waiting) {

3
src/http/ngx_http_spdy.h
View File

@ -106,7 +106,7 @@ struct ngx_http_spdy_connection_s {
ngx_uint_t last_sid;
unsigned blocked:2;
unsigned blocked:1;
unsigned waiting:1; /* FIXME better name */
};
@ -125,6 +125,7 @@ struct ngx_http_spdy_stream_s {
unsigned priority:2;
unsigned handled:1;
unsigned blocked:1;
unsigned in_closed:1;
unsigned out_closed:1;
unsigned skip_data:2;

14
src/http/ngx_http_spdy_filter_module.c
View File

@ -795,11 +795,15 @@ ngx_http_spdy_filter_get_data_frame(ngx_http_spdy_stream_t *stream,
static ngx_inline ngx_int_t
ngx_http_spdy_filter_send(ngx_connection_t *fc, ngx_http_spdy_stream_t *stream)
{
stream->blocked = 1;
if (ngx_http_spdy_send_output_queue(stream->connection) == NGX_ERROR) {
fc->error = 1;
return NGX_ERROR;
}
stream->blocked = 0;
if (stream->waiting) {
fc->buffered |= NGX_SPDY_WRITE_BUFFERED;
fc->write->delayed = 1;
@ -946,16 +950,14 @@ ngx_http_spdy_handle_stream(ngx_http_spdy_connection_t *sc,
fc->write->delayed = 0;
if (stream->handled) {
if (stream->handled || stream->blocked) {
return;
}
if (sc->blocked == 2) {
stream->handled = 1;
stream->handled = 1;
stream->next = sc->last_stream;
sc->last_stream = stream;
}
stream->next = sc->last_stream;
sc->last_stream = stream;
}