GUACAMOLE-919: pass postgres driver socketTimout

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

@@ -111,6 +111,9 @@ 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

@@ -56,6 +56,13 @@ public class PostgreSQLEnvironment extends JDBCEnvironment {
      */
     private static final String DEFAULT_DEFAULT_STATEMENT_TIMEOUT = "null";
 
+    /**
+     * The default socketTimeout (in seconds), if POSTGRESQL_SOCKET_TIMEOUT is not specified.
+     * Default to 0 (no timeout)
+     * https://jdbc.postgresql.org/documentation/head/connect.html
+     */
+    private static final int DEFAULT_SOCKET_TIMEOUT = 0;
+
     /**
      * Whether a database user account is required by default for authentication
      * to succeed.
@@ -275,6 +282,23 @@ public class PostgreSQLEnvironment extends JDBCEnvironment {
         );
     }
     
+    /**
+     * Returns the socketTimeout property to set on PostgreSQL connections.
+     * If unspecified, this will be the 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) {
         return true; // All versions of PostgreSQL support recursive queries through CTEs

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

@@ -106,6 +106,18 @@ public class PostgreSQLGuacamoleProperties {
 
     };
 
+    /**
+     * Sets the number of seconds the driver will wait in a read() call
+     * on the TCP connection to the database.
+     */
+    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

guacamole-docker/bin/start.sh

@@ -362,6 +362,10 @@ END
         "postgresql-user-required" \
         "$POSTGRES_USER_REQUIRED"
 
+    set_optional_property               \
+        "postgresql-socket-timeout" \
+        "$POSTGRES_SOCKET_TIMEOUT"
+
     set_optional_property      \
         "postgresql-ssl-mode"  \
         "$POSTGRESQL_SSL_MODE"