bugfix: now ngx.req.socket(raw) returns proper error when there is some other "light thread" reading the request body.

src/ngx_http_lua_socket_tcp.c

@@ -3149,7 +3149,15 @@ ngx_http_lua_req_socket(lua_State *L)
         lua_pushliteral(L, "nginx version too old");
         return 2;
 #else
-        if (!r->request_body) {
+        if (r->request_body) {
+            if (r->request_body->rest > 0) {
+                lua_pushnil(L);
+                lua_pushliteral(L, "pending request body reading in some "
+                                "other thread");
+                return 2;
+            }
+
+        } else {
             rb = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t));
             if (rb == NULL) {
                 return luaL_error(L, "out of memory");

t/116-raw-req-socket.t

@@ -5,7 +5,7 @@ use t::TestNginxLua;
 
 repeat_each(2);
 
-plan tests => repeat_each() * 33;
+plan tests => repeat_each() * 36;
 
 our $HtmlDir = html_dir;
 
@@ -735,3 +735,47 @@ hello
 --- no_error_log
 [error]
 
+
+
+=== TEST 14: pending request body reading
+--- config
+    server_tokens off;
+    location = /t {
+        content_by_lua '
+            ngx.thread.spawn(function ()
+                ngx.req.read_body()
+            end)
+
+            local sock, err = ngx.req.socket(true)
+            if not sock then
+                ngx.log(ngx.WARN, "server: failed to get raw req socket: ", err)
+                return ngx.exit(444)
+            end
+
+            local data, err = sock:receive(5)
+            if not data then
+                ngx.log(ngx.ERR, "failed to receive: ", err)
+                return
+            end
+
+            local ok, err = sock:send("HTTP/1.1 200 OK\\r\\nContent-Length: 5\\r\\n\\r\\n" .. data)
+            if not ok then
+                ngx.log(ngx.ERR, "failed to send: ", err)
+                return
+            end
+        ';
+    }
+
+--- raw_request eval
+"GET /t HTTP/1.0\r
+Host: localhost\r
+Content-Length: 5\r
+\r
+hell"
+--- ignore_response
+--- no_error_log
+[error]
+[alert]
+--- error_log
+server: failed to get raw req socket: pending request body reading in some other thread
+