RFC: Add CurlSharePersistentHandle objects (#16937)

see https://wiki.php.net/rfc/curl_share_persistence_improvement

NEWS

@@ -19,6 +19,7 @@ PHP                                                                        NEWS
 
 - Curl:
   . Added curl_multi_get_handles(). (timwolla)
+  . Added curl_share_init_persistent(). (enorris)
 
 - Date:
   . Fix undefined behaviour problems regarding integer overflow in extreme edge

UPGRADING

@@ -68,6 +68,11 @@ PHP 8.5 UPGRADE NOTES
   . Added support for Closures in constant expressions.
     RFC: https://wiki.php.net/rfc/closures_in_const_expr
 
+- Curl:
+  . Added support for share handles that are persisted across multiple PHP
+    requests, safely allowing for more effective connection reuse.
+    RFC: https://wiki.php.net/rfc/curl_share_persistence_improvement
+
 - DOM:
   . Added Dom\Element::$outerHTML.
 
@@ -148,6 +153,9 @@ PHP 8.5 UPGRADE NOTES
   . curl_multi_get_handles() allows retrieving all CurlHandles current
     attached to a CurlMultiHandle. This includes both handles added using
     curl_multi_add_handle() and handles accepted by CURLMOPT_PUSHFUNCTION.
+  . curl_share_init_persistent() allows creating a share handle that is
+    persisted across multiple PHP requests.
+    RFC: https://wiki.php.net/rfc/curl_share_persistence_improvement
 
 - DOM:
   . Added Dom\Element::insertAdjacentHTML().
@@ -166,6 +174,11 @@ PHP 8.5 UPGRADE NOTES
 7. New Classes and Interfaces
 ========================================
 
+- Curl:
+  . CurlSharePersistentHandle representing a share handle that is persisted
+    across multiple PHP requests.
+    RFC: https://wiki.php.net/rfc/curl_share_persistence_improvement
+
 ========================================
 8. Removed Extensions and SAPIs
 ========================================

Zend/Optimizer/zend_func_infos.h

@@ -46,6 +46,7 @@ static const func_info_t func_infos[] = {
 	F1("curl_multi_strerror", MAY_BE_STRING|MAY_BE_NULL),
 	F1("curl_share_init", MAY_BE_OBJECT),
 	F1("curl_share_strerror", MAY_BE_STRING|MAY_BE_NULL),
+	F1("curl_share_init_persistent", MAY_BE_OBJECT),
 	F1("curl_strerror", MAY_BE_STRING|MAY_BE_NULL),
 	F1("curl_version", MAY_BE_ARRAY|MAY_BE_ARRAY_KEY_STRING|MAY_BE_ARRAY_OF_LONG|MAY_BE_ARRAY_OF_STRING|MAY_BE_ARRAY_OF_ARRAY|MAY_BE_FALSE),
 	F1("date", MAY_BE_STRING),

ext/curl/curl.stub.php

@@ -3668,6 +3668,15 @@ final class CurlShareHandle
 {
 }
 
+/**
+ * @strict-properties
+ * @not-serializable
+ */
+final class CurlSharePersistentHandle
+{
+    public readonly array $options;
+}
+
 function curl_close(CurlHandle $handle): void {}
 
 /** @refcount 1 */
@@ -3750,6 +3759,9 @@ function curl_share_setopt(CurlShareHandle $share_handle, int $option, mixed $va
 /** @refcount 1 */
 function curl_share_strerror(int $error_code): ?string {}
 
+/** @refcount 1 */
+function curl_share_init_persistent(array $share_options): CurlSharePersistentHandle {}
+
 /** @refcount 1 */
 function curl_strerror(int $error_code): ?string {}
 

ext/curl/curl_private.h

@@ -40,9 +40,20 @@
 #define SAVE_CURL_ERROR(__handle, __err) \
     do { (__handle)->err.no = (int) __err; } while (0)
 
+
+ZEND_BEGIN_MODULE_GLOBALS(curl)
+	HashTable persistent_curlsh;
+ZEND_END_MODULE_GLOBALS(curl)
+
+ZEND_EXTERN_MODULE_GLOBALS(curl)
+
+#define CURL_G(v) ZEND_MODULE_GLOBALS_ACCESSOR(curl, v)
+
 PHP_MINIT_FUNCTION(curl);
 PHP_MSHUTDOWN_FUNCTION(curl);
 PHP_MINFO_FUNCTION(curl);
+PHP_GINIT_FUNCTION(curl);
+PHP_GSHUTDOWN_FUNCTION(curl);
 
 typedef struct {
 	zend_fcall_info_cache fcc;
@@ -153,6 +164,8 @@ static inline php_curlsh *curl_share_from_obj(zend_object *obj) {
 
 void curl_multi_register_handlers(void);
 void curl_share_register_handlers(void);
+void curl_share_persistent_register_handlers(void);
+void curl_share_free_persistent_curlsh(zval *data);
 void curlfile_register_class(void);
 zend_result curl_cast_object(zend_object *obj, zval *result, int type);
 

ext/curl/interface.c

@@ -67,6 +67,8 @@
 
 #include "curl_arginfo.h"
 
+ZEND_DECLARE_MODULE_GLOBALS(curl)
+
 #ifdef PHP_CURL_NEED_OPENSSL_TSL /* {{{ */
 static MUTEX_T *php_curl_openssl_tsl = NULL;
 
@@ -215,18 +217,34 @@ zend_module_entry curl_module_entry = {
 	NULL,
 	PHP_MINFO(curl),
 	PHP_CURL_VERSION,
-	STANDARD_MODULE_PROPERTIES
+	PHP_MODULE_GLOBALS(curl),
+	PHP_GINIT(curl),
+	PHP_GSHUTDOWN(curl),
+	NULL,
+	STANDARD_MODULE_PROPERTIES_EX
 };
 /* }}} */
 
 #ifdef COMPILE_DL_CURL
 ZEND_GET_MODULE (curl)
 #endif
 
+PHP_GINIT_FUNCTION(curl)
+{
+	zend_hash_init(&curl_globals->persistent_curlsh, 0, NULL, curl_share_free_persistent_curlsh, true);
+	GC_MAKE_PERSISTENT_LOCAL(&curl_globals->persistent_curlsh);
+}
+
+PHP_GSHUTDOWN_FUNCTION(curl)
+{
+	zend_hash_destroy(&curl_globals->persistent_curlsh);
+}
+
 /* CurlHandle class */
 
 zend_class_entry *curl_ce;
 zend_class_entry *curl_share_ce;
+zend_class_entry *curl_share_persistent_ce;
 static zend_object_handlers curl_object_handlers;
 
 static zend_object *curl_create_object(zend_class_entry *class_type);
@@ -410,6 +428,10 @@ PHP_MINIT_FUNCTION(curl)
 
 	curl_share_ce = register_class_CurlShareHandle();
 	curl_share_register_handlers();
+
+	curl_share_persistent_ce = register_class_CurlSharePersistentHandle();
+	curl_share_persistent_register_handlers();
+
 	curlfile_register_class();
 
 	return SUCCESS;
@@ -2281,16 +2303,24 @@ static zend_result _php_curl_setopt(php_curl *ch, zend_long option, zval *zvalue
 
 		case CURLOPT_SHARE:
 			{
-				if (Z_TYPE_P(zvalue) == IS_OBJECT && Z_OBJCE_P(zvalue) == curl_share_ce) {
-					php_curlsh *sh = Z_CURL_SHARE_P(zvalue);
-					curl_easy_setopt(ch->cp, CURLOPT_SHARE, sh->share);
+				if (Z_TYPE_P(zvalue) != IS_OBJECT) {
+					break;
+				}
 
-					if (ch->share) {
-						OBJ_RELEASE(&ch->share->std);
-					}
-					GC_ADDREF(&sh->std);
-					ch->share = sh;
+				if (Z_OBJCE_P(zvalue) != curl_share_ce && Z_OBJCE_P(zvalue) != curl_share_persistent_ce) {
+					break;
 				}
+
+				php_curlsh *sh = Z_CURL_SHARE_P(zvalue);
+
+				curl_easy_setopt(ch->cp, CURLOPT_SHARE, sh->share);
+
+				if (ch->share) {
+					OBJ_RELEASE(&ch->share->std);
+				}
+
+				GC_ADDREF(&sh->std);
+				ch->share = sh;
 			}
 			break;
 

ext/curl/php_curl.h

@@ -37,6 +37,7 @@ extern zend_module_entry curl_module_entry;
 
 PHP_CURL_API extern zend_class_entry *curl_ce;
 PHP_CURL_API extern zend_class_entry *curl_share_ce;
+PHP_CURL_API extern zend_class_entry *curl_share_persistent_ce;
 PHP_CURL_API extern zend_class_entry *curl_multi_ce;
 PHP_CURL_API extern zend_class_entry *curl_CURLFile_class;
 PHP_CURL_API extern zend_class_entry *curl_CURLStringFile_class;