如何从 Cloud Run Java 应用程序连接到 Cloud SQL 数据库？

Question

I have a Java/Vert.x application deployed as a Cloud Run container. It's running fine. I've tried to access my Cloud SQL MySQL instance to it, but to no avail. My application hangs as soon as I try to connect to the DB instance create a DataSource.

My Cloud Run container is associated with a service account with the Cloud SQL Client role.

I've followed the canonical GCP tutorial here: https://cloud.google.com/sql/docs/mysql/connect-run Obviously swapping in my specifics. Below is the offending code:

    private static final String PW = "mypassword";
    private static final String CONN_NAME = "/cloudsql/mydatabase-111222:us-west1:my-project";

    private DataSource pool;

    @Override
    public void init() throws Exception {
        LOGGER.info("MysqlRepo-init starting...");

        // The configuration object specifies behaviors for the connection pool.
        HikariConfig config = new HikariConfig();

        LOGGER.info("MysqlRepo-init 1");

        // Configure which instance and what database user to connect with.
        config.setJdbcUrl(String.format("jdbc:mysql:///%s", "mydb"));
        config.setUsername("root"); // e.g. "root", "postgres"
        config.setPassword(PW); // e.g. "my-password"

        // For Java users, the Cloud SQL JDBC Socket Factory can provide authenticated connections.
        // See https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory for details.
        config.addDataSourceProperty("socketFactory", "com.google.cloud.sql.mysql.SocketFactory");
        config.addDataSourceProperty("cloudSqlInstance", CONN_NAME);
        config.addDataSourceProperty("useSSL", "false");

        LOGGER.info("MysqlRepo-init 2");
        // Initialize the connection pool using the configuration object.
        pool = new HikariDataSource(config);

        LOGGER.info("MysqlRepo-init 3");

        ResultSet rs = pool.getConnection().createStatement().executeQuery("SELECT COUNT(*) col FROM dual WHERE 1=1");

        LOGGER.info("MysqlRepo-init Results = " + rs.getFetchSize());

        LOGGER.info("...MysqlRepo-init done");
    }

My logs stop at "MysqlRepo-init 2" (beyond that, I get Vertx warnings that my main thread is blocked).

Any thoughts on what I might be missing?

Answer 1

The problem seems to have something to do with calling this code from a Vert.x verticle. When I called it directly from the application's main method, I was able to get useful log messages, which were complaining about the "/cloudsql/" portion of the connection name. That provided enough information to ultimately resolve ths issue.