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feat: create new connection on connection validation error in postgres (
#122)
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114 changes: 114 additions & 0 deletions
114
document-store/src/main/java/org/hypertrace/core/documentstore/postgres/PostgresClient.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package org.hypertrace.core.documentstore.postgres; | ||
|
|
||
| import java.sql.Connection; | ||
| import java.sql.DriverManager; | ||
| import java.sql.PreparedStatement; | ||
| import java.sql.ResultSet; | ||
| import java.sql.SQLException; | ||
| import java.time.Duration; | ||
| import java.util.concurrent.TimeUnit; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| class PostgresClient { | ||
|
|
||
| private static final Logger log = LoggerFactory.getLogger(PostgresClient.class); | ||
| private static final int VALIDATION_QUERY_TIMEOUT_SECONDS = 5; | ||
|
|
||
| private final String url; | ||
| private final String user; | ||
| private final String password; | ||
| private final int maxConnectionAttempts; | ||
| private final Duration connectionRetryBackoff; | ||
|
|
||
| private int count = 0; | ||
| private Connection connection; | ||
|
|
||
| public PostgresClient( | ||
| String url, | ||
| String user, | ||
| String password, | ||
| int maxConnectionAttempts, | ||
| Duration connectionRetryBackoff) { | ||
| this.url = url; | ||
| this.user = user; | ||
| this.password = password; | ||
| this.maxConnectionAttempts = maxConnectionAttempts; | ||
| this.connectionRetryBackoff = connectionRetryBackoff; | ||
| } | ||
|
|
||
| public synchronized Connection getConnection() { | ||
| try { | ||
| if (connection == null) { | ||
| newConnection(); | ||
| } else if (!isConnectionValid(connection)) { | ||
| log.info("The database connection is invalid. Reconnecting..."); | ||
| close(); | ||
| newConnection(); | ||
| } | ||
| } catch (SQLException sqle) { | ||
| throw new RuntimeException(sqle); | ||
| } | ||
| return connection; | ||
| } | ||
|
|
||
| private boolean isConnectionValid(Connection connection) { | ||
| try { | ||
| if (connection.getMetaData().getJDBCMajorVersion() >= 4) { | ||
| return connection.isValid(VALIDATION_QUERY_TIMEOUT_SECONDS); | ||
| } else { | ||
| try (PreparedStatement preparedStatement = connection.prepareStatement("SELECT 1"); | ||
| ResultSet resultSet = preparedStatement.executeQuery()) { | ||
| return true; | ||
| } | ||
| } | ||
| } catch (SQLException sqle) { | ||
| log.debug("Unable to check if the underlying connection is valid", sqle); | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| private void newConnection() throws SQLException { | ||
| ++count; | ||
| int attempts = 0; | ||
| while (attempts < maxConnectionAttempts) { | ||
| try { | ||
| ++attempts; | ||
| log.info("Attempting(attempt #{}) to open connection #{} to {}", attempts, count, url); | ||
| connection = DriverManager.getConnection(url, user, password); | ||
| return; | ||
| } catch (SQLException sqle) { | ||
| attempts++; | ||
| if (attempts < maxConnectionAttempts) { | ||
| log.info( | ||
| "Unable to connect(#{}) to database on attempt {}/{}. Will retry in {} ms.", | ||
| count, | ||
| attempts, | ||
| maxConnectionAttempts, | ||
| connectionRetryBackoff, | ||
| sqle); | ||
| try { | ||
| TimeUnit.MILLISECONDS.sleep(connectionRetryBackoff.toMillis()); | ||
| } catch (InterruptedException e) { | ||
| // this is ok because just woke up early | ||
| } | ||
| } else { | ||
| throw sqle; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private void close() { | ||
| if (connection != null) { | ||
| try { | ||
| log.info("Closing connection #{} to {}", count, url); | ||
| connection.close(); | ||
| } catch (SQLException sqle) { | ||
| log.warn("Ignoring error closing connection", sqle); | ||
| } finally { | ||
| connection = null; | ||
| } | ||
| } | ||
| } | ||
| } |
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