fix: flyway 전용 DataSource를 사용하도록 수정 (#613)

* fix: flyway 전용 DataSource를 사용하도록 수정

* fix: fix: Flyway DataSource 설정에 기본값 추가

- 테스트 환경에서 flyway.user 미설정 시에도 정상 동작하도록 수정

* refactor: 리뷰 내용 반영

* fix: 서브모듈 해시값 revert

Author: sukangpunch

src/main/java/com/example/solidconnection/common/config/datasource/DataSourceConfig.java

@@ -0,0 +1,69 @@
+package com.example.solidconnection.common.config.datasource;
+
+import com.example.solidconnection.common.listener.QueryMetricsListener;
+import com.zaxxer.hikari.HikariDataSource;
+import javax.sql.DataSource;
+import lombok.RequiredArgsConstructor;
+import net.ttddyy.dsproxy.support.ProxyDataSourceBuilder;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.flyway.FlywayDataSource;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+
+@RequiredArgsConstructor
+@Configuration
+public class DataSourceConfig {
+
+    private final QueryMetricsListener queryMetricsListener;
+
+    // Driver
+    public static final String FLYWAY_MYSQL_DRIVER = "com.mysql.cj.jdbc.Driver";
+
+    // Pool Name
+    public static final String FLYWAY_POOL_NAME = "FlywayPool";
+
+    // Connection Pool Settings
+    public static final int FLYWAY_MINIMUM_IDLE = 0;            // 유휴 커넥션을 0으로 설정하면 사용하지 않을 때 커넥션을 즉시 반납
+    public static final int FLYWAY_MAXIMUM_POOL_SIZE = 2;
+    public static final long FLYWAY_CONNECTION_TIMEOUT = 10000L;
+    public static final long FLYWAY_IDLE_TIMEOUT = 60000L;      // 1분
+    public static final long FLYWAY_MAX_LIFETIME = 300000L;     // 5분
+
+    @Bean
+    @Primary
+    public DataSource proxyDataSource(DataSourceProperties props) {
+        DataSource dataSource = props.initializeDataSourceBuilder().build();
+
+        return ProxyDataSourceBuilder
+                .create(dataSource)
+                .listener(queryMetricsListener)
+                .name("main")
+                .build();
+    }
+
+    // Flyway 전용 DataSource (Proxy 미적용)
+    @Bean
+    @FlywayDataSource
+    public DataSource flywayDataSource(
+            @Value("${spring.datasource.url}") String url,
+            @Value("${spring.flyway.user:${spring.datasource.username}}") String username,
+            @Value("${spring.flyway.password:${spring.datasource.password}}") String password
+    ) {
+        HikariDataSource dataSource = new HikariDataSource();
+        dataSource.setJdbcUrl(url);
+        dataSource.setUsername(username);
+        dataSource.setPassword(password);
+        dataSource.setDriverClassName(FLYWAY_MYSQL_DRIVER);
+        dataSource.setPoolName(FLYWAY_POOL_NAME);
+
+        dataSource.setMinimumIdle(FLYWAY_MINIMUM_IDLE);
+        dataSource.setMaximumPoolSize(FLYWAY_MAXIMUM_POOL_SIZE);
+        dataSource.setConnectionTimeout(FLYWAY_CONNECTION_TIMEOUT);
+        dataSource.setIdleTimeout(FLYWAY_IDLE_TIMEOUT);       // 1분으로 단축
+        dataSource.setMaxLifetime(FLYWAY_MAX_LIFETIME);      // 최대 5분
+
+        return dataSource;
+    }
+}