Replace unixSocketPath with ipTypes for Cloud SQL TCP (#402)

* fix(java,kotlin): replace unixSocketPath with ipTypes for Cloud SQL TCP connection

Switch Cloud SQL connector from Unix socket to TCP+TLS by removing
unixSocketPath and setting ipTypes=PUBLIC,PRIVATE, allowing the Java
connector to establish direct connections without a proxy sidecar.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* test(java): update DataSourceConfigTest to reflect ipTypes over unixSocketPath

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: davideme

src/java/src/main/java/org/openapitools/config/DataSourceConfig.java

@@ -205,7 +205,7 @@ private void configureCloudSqlProperties(HikariConfig config, String jdbcUrl) {
     }
 
     config.addDataSourceProperty("socketFactory", "com.google.cloud.sql.postgres.SocketFactory");
-    config.addDataSourceProperty("unixSocketPath", instanceUnixSocket);
+    config.addDataSourceProperty("ipTypes", "PUBLIC,PRIVATE");
     String cloudSqlInstance = extractCloudSqlInstance(instanceUnixSocket);
     if (isNotBlank(cloudSqlInstance)) {
       config.addDataSourceProperty("cloudSqlInstance", cloudSqlInstance);

src/java/src/test/java/org/openapitools/config/DataSourceConfigTest.java

@@ -94,8 +94,9 @@ void hikariConfig_ShouldNormalizeCloudSqlSocketStyleDatabaseUrl() throws Excepti
                 + "&password=redacted-password");
     assertThat(result.getDataSourceProperties())
         .containsEntry("socketFactory", "com.google.cloud.sql.postgres.SocketFactory")
-        .containsEntry("unixSocketPath", "/cloudsql/project-id:region:instance-id")
+        .containsEntry("ipTypes", "PUBLIC,PRIVATE")
         .containsEntry("cloudSqlInstance", "project-id:region:instance-id")
+        .doesNotContainKey("unixSocketPath")
         .doesNotContainKey("cloudSqlRefreshStrategy");
   }
 
@@ -120,8 +121,9 @@ void hikariConfig_ShouldSetCloudSqlRefreshStrategyOnCloudRunInSocketMode() throw
 
     assertThat(result.getDataSourceProperties())
         .containsEntry("socketFactory", "com.google.cloud.sql.postgres.SocketFactory")
-        .containsEntry("unixSocketPath", "/cloudsql/project-id:region:instance-id")
+        .containsEntry("ipTypes", "PUBLIC,PRIVATE")
         .containsEntry("cloudSqlInstance", "project-id:region:instance-id")
+        .doesNotContainKey("unixSocketPath")
         .containsEntry("cloudSqlRefreshStrategy", "lazy");
   }
 

src/kotlin/src/main/kotlin/com/lampcontrol/database/DatabaseFactory.kt

@@ -75,7 +75,7 @@ object DatabaseFactory {
         }
 
         hikariConfig.addDataSourceProperty("socketFactory", CLOUD_SQL_SOCKET_FACTORY)
-        hikariConfig.addDataSourceProperty("unixSocketPath", config.host)
+        hikariConfig.addDataSourceProperty("ipTypes", "PUBLIC,PRIVATE")
         val cloudSqlInstance = extractCloudSqlInstance(config.host)
         if (cloudSqlInstance != null) {
             hikariConfig.addDataSourceProperty("cloudSqlInstance", cloudSqlInstance)