Implement Valkey >= 8.1 IFEQ set option

Implement the new `IFEQ` `SET` option that will be included in `Valkey`
8.1.

See: valkey-io/valkey#1324

redis_commands.c

@@ -2293,7 +2293,8 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
                   char **cmd, int *cmd_len, short *slot, void **ctx)
 {
     char *key = NULL, *exp_type = NULL, *set_type = NULL;
-    zval *z_value, *z_opts=NULL;
+    zend_string *ifeq = NULL, *tmp = NULL;
+    zval *z_value, *z_opts = NULL;
     smart_string cmdstr = {0};
     zend_long expire = -1;
     zend_bool get = 0;
@@ -2312,7 +2313,6 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
         return FAILURE;
     }
 
-
     // Check for an options array
     if (z_opts && Z_TYPE_P(z_opts) == IS_ARRAY) {
         HashTable *kt = Z_ARRVAL_P(z_opts);
@@ -2329,11 +2329,14 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
                          zend_string_equals_literal_ci(zkey, "PXAT"))
             ) {
                 if (redis_try_get_expiry(v, &expire) == FAILURE || expire < 1) {
+                    zend_tmp_string_release(tmp);
                     setExpiryWarning(v);
                     return FAILURE;
                 }
 
                 exp_type = ZSTR_VAL(zkey);
+            } else if (zkey && !ifeq && zend_string_equals_literal_ci(zkey, "IFEQ")) {
+                ifeq = zval_get_tmp_string(v, &tmp);
             } else if (Z_TYPE_P(v) == IS_STRING) {
                 if (zend_string_equals_literal_ci(Z_STR_P(v), "KEEPTTL")) {
                     keep_ttl  = 1;
@@ -2348,6 +2351,7 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
         } ZEND_HASH_FOREACH_END();
     } else if (z_opts && Z_TYPE_P(z_opts) != IS_NULL) {
         if (redis_try_get_expiry(z_opts, &expire) == FAILURE || expire < 1) {
+            zend_tmp_string_release(tmp);
             setExpiryWarning(z_opts);
             return FAILURE;
         }
@@ -2356,6 +2360,14 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
     /* Protect the user from syntax errors but give them some info about what's wrong */
     if (exp_type && keep_ttl) {
         php_error_docref(NULL, E_WARNING, "KEEPTTL can't be combined with EX or PX option");
+        zend_tmp_string_release(tmp);
+        return FAILURE;
+    }
+
+    /* You can't use IFEQ with NX or XX */
+    if (set_type && ifeq) {
+        php_error_docref(NULL, E_WARNING, "IFEQ can't be combined with NX or XX option");
+        zend_tmp_string_release(tmp);
         return FAILURE;
     }
 
@@ -2363,11 +2375,13 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
      * actually execute a SETEX command */
     if (expire > 0 && !exp_type && !set_type && !keep_ttl) {
         *cmd_len = REDIS_CMD_SPPRINTF(cmd, "SETEX", "klv", key, key_len, expire, z_value);
+        zend_tmp_string_release(tmp);
         return SUCCESS;
     }
 
     /* Calculate argc based on options set */
-    int argc = 2 + (exp_type ? 2 : 0) + (set_type != NULL) + (keep_ttl != 0) + get;
+    int argc = 2 + (ifeq ? 2 : 0) + (exp_type ? 2 : 0) + (set_type != NULL) + 
+        (keep_ttl != 0) + get;
 
     /* Initial SET <key> <value> */
     redis_cmd_init_sstr(&cmdstr, argc, "SET", 3);
@@ -2379,8 +2393,13 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
         redis_cmd_append_sstr_long(&cmdstr, (long)expire);
     }
 
-    if (set_type)
+    if (ifeq) {
+        REDIS_CMD_APPEND_SSTR_STATIC(&cmdstr, "IFEQ");
+        redis_cmd_append_sstr_zstr(&cmdstr, ifeq);
+    } else if (set_type) {
         redis_cmd_append_sstr(&cmdstr, set_type, strlen(set_type));
+    }
+
     if (keep_ttl)
         redis_cmd_append_sstr(&cmdstr, "KEEPTTL", 7);
     if (get) {
@@ -2388,6 +2407,8 @@ int redis_set_cmd(INTERNAL_FUNCTION_PARAMETERS, RedisSock *redis_sock,
         *ctx = PHPREDIS_CTX_PTR;
     }
 
+    zend_tmp_string_release(tmp);
+
     /* Push command and length to the caller */
     *cmd = cmdstr.c;
     *cmd_len = cmdstr.len;

tests/RedisClusterTest.php

@@ -133,6 +133,7 @@ class Redis_Cluster_Test extends Redis_Test {
         $info           = $this->redis->info(uniqid());
         $this->version  = $info['redis_version'] ?? '0.0.0';
         $this->is_keydb = $this->detectKeyDB($info);
+        $this->is_valkey = $this->detectValkey($info);
     }
 
     /* Override newInstance as we want a RedisCluster object */

tests/RedisTest.php

@@ -67,11 +67,16 @@ class Redis_Test extends TestSuite {
                isset($info['mvcc_depth']);
     }
 
+    protected function detectValkey(array $info) {
+        return isset($info['server_name']) && $info['server_name'] === 'valkey';
+    }
+
     public function setUp() {
         $this->redis = $this->newInstance();
         $info = $this->redis->info();
         $this->version = (isset($info['redis_version'])?$info['redis_version']:'0.0.0');
         $this->is_keydb = $this->detectKeyDB($info);
+        $this->is_valkey = $this->detectValKey($info); 
     }
 
     protected function minVersionCheck($version) {
@@ -629,6 +634,19 @@ class Redis_Test extends TestSuite {
         $this->assertEquals('bar', $this->redis->set('foo', 'baz', ['GET']));
     }
 
+    /* Test Valkey >= 8.1 IFEQ SET option */
+    public function testValkeyIfEq() {
+        if ( ! $this->is_valkey || ! $this->minVersionCheck('8.1.0'))
+            $this->markTestSkipped();
+
+        $this->redis->del('foo');
+        $this->assertTrue($this->redis->set('foo', 'bar'));
+        $this->assertTrue($this->redis->set('foo', 'bar2', ['IFEQ' => 'bar']));
+        $this->assertFalse($this->redis->set('foo', 'bar4', ['IFEQ' => 'bar3']));
+
+        $this->assertEquals('bar2', $this->redis->set('foo', 'bar3', ['IFEQ' => 'bar2', 'GET']));
+    }
+
     public function testGetSet() {
         $this->redis->del('key');
         $this->assertFalse($this->redis->getSet('key', '42'));

tests/TestSuite.php

@@ -16,6 +16,7 @@ class TestSuite
     /* Redis server version */
     protected $version;
     protected bool $is_keydb;
+    protected bool $is_valkey;
 
     private static bool $colorize = false;