bugfix: correctly error out when ngx.socket.tcp is shutdown before connect

src/ngx_stream_lua_socket_tcp.c

@@ -3185,6 +3185,25 @@ ngx_stream_lua_socket_tcp_shutdown(lua_State *L)
         return luaL_error(L, "no request found");
     }
 
+    if (u == NULL
+        || u->peer.connection == NULL
+        || (u->read_closed && u->write_closed))
+    {
+        lua_pushnil(L);
+        lua_pushliteral(L, "closed");
+        return 2;
+    }
+
+    if (u->write_closed) {
+        lua_pushnil(L);
+        lua_pushliteral(L, "already shutdown");
+        return 2;
+    }
+
+    if (u->request != r) {
+        return luaL_error(L, "bad request");
+    }
+
     ctx = ngx_stream_lua_get_module_ctx(r, ngx_stream_lua_module);
     if (ctx == NULL) {
         ngx_stream_lua_socket_handle_write_error(r, u,
@@ -3212,25 +3231,6 @@ ngx_stream_lua_socket_tcp_shutdown(lua_State *L)
         ctx->eof = 1;
     }
 
-    if (u == NULL
-        || u->peer.connection == NULL
-        || (u->read_closed && u->write_closed))
-    {
-        lua_pushnil(L);
-        lua_pushliteral(L, "closed");
-        return 2;
-    }
-
-    if (u->write_closed) {
-        lua_pushnil(L);
-        lua_pushliteral(L, "already shutdown");
-        return 2;
-    }
-
-    if (u->request != r) {
-        return luaL_error(L, "bad request");
-    }
-
     ngx_stream_lua_socket_check_busy_connecting(r, u, L);
     ngx_stream_lua_socket_check_busy_writing(r, u, L);
 

t/058-tcp-socket.t

@@ -4,7 +4,7 @@ use Test::Nginx::Socket::Lua::Stream;
 
 repeat_each(2);
 
-plan tests => repeat_each() * 219;
+plan tests => repeat_each() * 221;
 
 our $HtmlDir = html_dir;
 
@@ -3526,3 +3526,22 @@ orld
 [error]
 --- error_log
 lua tcp socket calling receiveany() method to read at most 7 bytes
+
+
+
+=== TEST 67: shutdown on a not connected socket correctly throws error
+--- stream_server_config
+    lua_socket_connect_timeout 1s;
+    resolver $TEST_NGINX_RESOLVER ipv6=off;
+    resolver_timeout 3s;
+
+    content_by_lua_block {
+        local sock = ngx.socket.tcp()
+
+        local ok, err = sock:shutdown('send')
+        ngx.log(ngx.ERR, 'shutdown on a not connected socket: ', err)
+
+    }
+
+--- error_log
+shutdown on a not connected socket: closed