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changeset 6435:d1c791479bbb

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Stream: post first read events from client and upstream. The main proxy function ngx_stream_proxy_process() can terminate the stream session. The code, following it, should check its return code to make sure the session still exists. This happens in client and upstream initialization functions. Swapping ngx_stream_proxy_process() call with the code, that follows it, leaves the same problem vice versa. In future ngx_stream_proxy_process() will call ngx_stream_proxy_next_upstream() making it too complicated to know if stream session still exists after this call. Now ngx_stream_proxy_process() is called from posted event handlers in both places with no code following it. The posted event is automatically removed once session is terminated.
author Roman Arutyunyan <arut@nginx.com>
date Tue, 15 Mar 2016 15:55:23 +0300
parents 602dc42035fe
children 8f038068f4bc
files src/stream/ngx_stream_proxy_module.c
diffstat 1 files changed, 10 insertions(+), 12 deletions(-) [+]
line wrap: on
line diff
--- a/src/stream/ngx_stream_proxy_module.c
+++ b/src/stream/ngx_stream_proxy_module.c
@@ -54,7 +54,7 @@ static void ngx_stream_proxy_process_con
     ngx_uint_t from_upstream);
 static void ngx_stream_proxy_connect_handler(ngx_event_t *ev);
 static ngx_int_t ngx_stream_proxy_test_connect(ngx_connection_t *c);
-static ngx_int_t ngx_stream_proxy_process(ngx_stream_session_t *s,
+static void ngx_stream_proxy_process(ngx_stream_session_t *s,
     ngx_uint_t from_upstream, ngx_uint_t do_write);
 static void ngx_stream_proxy_next_upstream(ngx_stream_session_t *s);
 static void ngx_stream_proxy_finalize(ngx_stream_session_t *s, ngx_int_t rc);
@@ -406,8 +406,8 @@ ngx_stream_proxy_handler(ngx_stream_sess
         u->proxy_protocol = 0;
     }
 
-    if (ngx_stream_proxy_process(s, 0, 0) != NGX_OK) {
-        return;
+    if (c->read->ready) {
+        ngx_post_event(c->read, &ngx_posted_events);
     }
 
     ngx_stream_proxy_connect(s);
@@ -560,8 +560,8 @@ ngx_stream_proxy_init_upstream(ngx_strea
     pc->read->handler = ngx_stream_proxy_upstream_handler;
     pc->write->handler = ngx_stream_proxy_upstream_handler;
 
-    if (ngx_stream_proxy_process(s, 1, 0) != NGX_OK) {
-        return;
+    if (pc->read->ready) {
+        ngx_post_event(pc->read, &ngx_posted_events);
     }
 
     ngx_stream_proxy_process(s, 0, 1);
@@ -1019,7 +1019,7 @@ ngx_stream_proxy_test_connect(ngx_connec
 }
 
 
-static ngx_int_t
+static void
 ngx_stream_proxy_process(ngx_stream_session_t *s, ngx_uint_t from_upstream,
     ngx_uint_t do_write)
 {
@@ -1068,7 +1068,7 @@ ngx_stream_proxy_process(ngx_stream_sess
 
                 if (n == NGX_ERROR) {
                     ngx_stream_proxy_finalize(s, NGX_DECLINED);
-                    return NGX_ERROR;
+                    return;
                 }
 
                 if (n > 0) {
@@ -1147,20 +1147,20 @@ ngx_stream_proxy_process(ngx_stream_sess
         c->log->handler = handler;
 
         ngx_stream_proxy_finalize(s, NGX_OK);
-        return NGX_DONE;
+        return;
     }
 
     flags = src->read->eof ? NGX_CLOSE_EVENT : 0;
 
     if (ngx_handle_read_event(src->read, flags) != NGX_OK) {
         ngx_stream_proxy_finalize(s, NGX_ERROR);
-        return NGX_ERROR;
+        return;
     }
 
     if (dst) {
         if (ngx_handle_write_event(dst->write, 0) != NGX_OK) {
             ngx_stream_proxy_finalize(s, NGX_ERROR);
-            return NGX_ERROR;
+            return;
         }
 
         if (!c->read->delayed && !pc->read->delayed) {
@@ -1170,8 +1170,6 @@ ngx_stream_proxy_process(ngx_stream_sess
             ngx_del_timer(c->write);
         }
     }
-
-    return NGX_OK;
 }