fix(http): release the cached addresses of keep-alive sessions in process mode

ext-src/php_swoole_http_server.h

@@ -25,6 +25,7 @@
 
 bool swoole_http_server_onBeforeRequest(swoole::http::Context *ctx);
 void swoole_http_server_onAfterResponse(swoole::http::Context *ctx);
+bool swoole_http_server_is_ip_cache_enabled(const swoole::Server *server);
 void swoole_http_server_populate_ip_and_port(
     swoole::Server *server, HashTable *ht, swoole::Connection *conn, swoole::SessionId session_id, bool keepalive);
 

ext-src/swoole_http_server.cc

@@ -442,6 +442,12 @@ void swoole_http_server_onAfterResponse(HttpContext *ctx) {
     }
 }
 
+// the addresses of a keep-alive session stay cached until php_swoole_http_server_onClose() erases them
+// so cache them only when the close event of the session reaches the same worker
+bool swoole_http_server_is_ip_cache_enabled(const Server *server) {
+    return server->is_base_mode() || (server->is_process_mode() && server->dispatch_mode == Server::DISPATCH_FDMOD);
+}
+
 /**
  * When calculating the server-side IP and client-side IP, since these two calculations
  * share the same memory block, they cannot be performed simultaneously; otherwise,
@@ -481,8 +487,7 @@ void swoole_http_server_populate_ip_and_port(
         http_server_add_server_array(ht, SW_ZSTR_KNOWN(SW_ZEND_STR_SERVER_ADDR), SW_ZSTR_KNOWN(key));
         http_server_add_server_array(ht, SW_ZSTR_KNOWN(SW_ZEND_STR_REMOTE_ADDR), SW_ZSTR_KNOWN(key));
     } else {
-        if (keepalive && (server->is_base_mode() ||
-                          (server->is_process_mode() && server->dispatch_mode == Server::DISPATCH_FDMOD))) {
+        if (keepalive && swoole_http_server_is_ip_cache_enabled(server)) {
             http_server_session_track_ip(
                 server, ht, conn, session_id, SW_ZSTR_KNOWN(SW_ZEND_STR_SERVER_ADDR), server_ips);
             http_server_session_track_ip(

ext-src/swoole_server.cc

@@ -1037,7 +1037,7 @@ void ServerObject::on_before_start() {
 
     if (find_http_port) {
         serv->onReceive = php_swoole_http_server_onReceive;
-        if (serv->is_base_mode()) {
+        if (swoole_http_server_is_ip_cache_enabled(serv)) {
             serv->onClose = php_swoole_http_server_onClose;
         }
     }

tests/swoole_http_server/server_addr_released_on_close.phpt

@@ -0,0 +1,66 @@
+--TEST--
+swoole_http_server: release the cached addresses of keep-alive connections closed by the client in process mode
+--SKIPIF--
+<?php require __DIR__ . '/../include/skipif.inc'; ?>
+--FILE--
+<?php
+require __DIR__ . '/../include/bootstrap.php';
+
+use Swoole\Coroutine\Http\Client;
+use Swoole\Http\Request;
+use Swoole\Http\Response;
+use Swoole\Http\Server;
+
+const N = 500;
+
+$ips = get_server_ips();
+
+$pm = new ProcessManager;
+$pm->parentFunc = function () use ($pm, $ips) {
+    Co\run(function () use ($pm, $ips) {
+        // the server closes these connections so it does not cache their addresses
+        $memory = function () use ($pm, $ips): int {
+            return (int) httpGetBody("http://{$ips[1]}:{$pm->getFreePort()}/memory", [
+                'headers' => ['Connection' => 'close'],
+            ]);
+        };
+        $before = $memory();
+        for ($i = 0; $i < N; $i++) {
+            $client = new Client($ips[1], $pm->getFreePort());
+            Assert::true($client->get('/'));
+            Assert::eq($client->body, $ips[1]);
+            $client->close();
+        }
+        // let the worker handle the close events
+        Co::sleep(0.5);
+        $after = $memory();
+        // a connection that keeps both cached addresses holds at least 64 bytes
+        Assert::lessThan($after - $before, N * 16);
+    });
+    $pm->kill();
+    echo "DONE\n";
+};
+
+$pm->childFunc = function () use ($pm) {
+    $http = new Server('0.0.0.0', $pm->getFreePort(), SWOOLE_PROCESS);
+    $http->set([
+        'worker_num' => 1,
+        'log_file' => '/dev/null',
+    ]);
+    $http->on('workerStart', function () use ($pm) {
+        $pm->wakeup();
+    });
+    $http->on('request', function (Request $request, Response $response) {
+        if ($request->server['request_uri'] === '/memory') {
+            $response->end((string) memory_get_usage());
+        } else {
+            $response->end($request->server['remote_addr']);
+        }
+    });
+    $http->start();
+};
+$pm->childFirst();
+$pm->run();
+?>
+--EXPECT--
+DONE