GUACAMOLE-919: Merge implement PostgreSQL defaultStatementTimeout and socketTimeout

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/src/main/java/org/apache/guacamole/auth/postgresql/PostgreSQLAuthenticationProviderModule.java

@@ -70,6 +70,15 @@ public class PostgreSQLAuthenticationProviderModule implements Module {
         myBatisProperties.setProperty("mybatis.pooled.pingEnabled", "true");
         myBatisProperties.setProperty("mybatis.pooled.pingQuery", "SELECT 1");
 
+        // Only set if > 0. Underlying backend does not take 0 as not-set.
+        int defaultStatementTimeout = environment.getPostgreSQLDefaultStatementTimeout();
+        if (defaultStatementTimeout > 0) {
+            myBatisProperties.setProperty(
+                "mybatis.configuration.defaultStatementTimeout",
+                String.valueOf(defaultStatementTimeout)
+            );
+        }
+
         // Use UTF-8 in database
         driverProperties.setProperty("characterEncoding", "UTF-8");
         
@@ -110,6 +119,12 @@ public class PostgreSQLAuthenticationProviderModule implements Module {
             
         }
 
+        // Handle case where TCP connection to database is silently dropped
+        driverProperties.setProperty(
+            "socketTimeout",
+            String.valueOf(environment.getPostgreSQLSocketTimeout())
+        );
+
     }
 
     @Override

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/src/main/java/org/apache/guacamole/auth/postgresql/conf/PostgreSQLEnvironment.java

@@ -48,6 +48,19 @@ public class PostgreSQLEnvironment extends JDBCEnvironment {
      */
     private static final int DEFAULT_PORT = 5432;
 
+    /**
+     * The default number of seconds the driver will wait for a response from
+     * the database, before aborting the query.
+     * A value of 0 (the default) means the timeout is disabled.
+     */
+    private static final int DEFAULT_STATEMENT_TIMEOUT = 0;
+
+    /**
+     * The default number of seconds to wait for socket read operations.
+     * A value of 0 (the default) means the timeout is disabled.
+     */
+    private static final int DEFAULT_SOCKET_TIMEOUT = 0;
+
     /**
      * Whether a database user account is required by default for authentication
      * to succeed.
@@ -249,6 +262,41 @@ public class PostgreSQLEnvironment extends JDBCEnvironment {
     public String getPostgreSQLPassword() throws GuacamoleException {
         return getRequiredProperty(PostgreSQLGuacamoleProperties.POSTGRESQL_PASSWORD);
     }
+    
+    /**
+     * Returns the defaultStatementTimeout set for PostgreSQL connections.
+     * If unspecified, this will default to 0,
+     * and should not be passed through to the backend.
+     * 
+     * @return
+     *     The statement timeout (in seconds)
+     *
+     * @throws GuacamoleException 
+     *     If an error occurs while retrieving the property value.
+     */
+    public int getPostgreSQLDefaultStatementTimeout() throws GuacamoleException {
+        return getProperty(
+            PostgreSQLGuacamoleProperties.POSTGRESQL_DEFAULT_STATEMENT_TIMEOUT,
+            DEFAULT_STATEMENT_TIMEOUT
+        );
+    }
+    
+    /**
+     * Returns the socketTimeout property to set on PostgreSQL connections.
+     * If unspecified, this will default to 0 (no timeout)
+     * 
+     * @return
+     *     The socketTimeout to use when waiting on read operations (in seconds)
+     *
+     * @throws GuacamoleException 
+     *     If an error occurs while retrieving the property value.
+     */
+    public int getPostgreSQLSocketTimeout() throws GuacamoleException {
+        return getProperty(
+            PostgreSQLGuacamoleProperties.POSTGRESQL_SOCKET_TIMEOUT,
+            DEFAULT_SOCKET_TIMEOUT
+        );
+    }
 
     @Override
     public boolean isRecursiveQuerySupported(SqlSession session) {

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/src/main/java/org/apache/guacamole/auth/postgresql/conf/PostgreSQLGuacamoleProperties.java

@@ -94,6 +94,36 @@ public class PostgreSQLGuacamoleProperties {
 
     };
 
+    /**
+     * The number of seconds the driver will wait for a response from
+     * the database, before aborting the query.
+     * A value of 0 (the default) means the timeout is disabled.
+     */
+    public static final IntegerGuacamoleProperty
+            POSTGRESQL_DEFAULT_STATEMENT_TIMEOUT = new IntegerGuacamoleProperty() {
+
+        @Override
+        public String getName() { return "postgresql-default-statement-timeout"; }
+
+    };
+
+    /**
+     * The number of seconds to wait for socket read operations.
+     * If reading from the server takes longer than this value, the
+     * connection will be closed. This can be used to handle network problems
+     * such as a dropped connection to the database. Similar to 
+     * postgresql-default-statement-timeout, it will have the effect of
+     * aborting queries that take too long.
+     * A value of 0 (the default) means the timeout is disabled.
+     */
+    public static final IntegerGuacamoleProperty
+            POSTGRESQL_SOCKET_TIMEOUT = new IntegerGuacamoleProperty() {
+
+        @Override
+        public String getName() { return "postgresql-socket-timeout"; }
+
+    };
+
     /**
      * Whether a user account within the database is required for authentication
      * to succeed, even if the user has been authenticated via another