| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.cassandra.utils.logging; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.Set; |
| |
| import com.google.common.collect.ImmutableSet; |
| |
| import ch.qos.logback.classic.spi.LoggingEvent; |
| import ch.qos.logback.core.AppenderBase; |
| import org.apache.cassandra.audit.FileAuditLogger; |
| import org.apache.cassandra.db.virtual.LogMessagesTable; |
| import org.apache.cassandra.db.virtual.VirtualKeyspace; |
| import org.apache.cassandra.db.virtual.VirtualKeyspaceRegistry; |
| import org.apache.cassandra.db.virtual.VirtualTable; |
| |
| import static org.apache.cassandra.db.virtual.LogMessagesTable.LOGS_VIRTUAL_TABLE_DEFAULT_ROWS; |
| import static org.apache.cassandra.db.virtual.LogMessagesTable.TABLE_NAME; |
| import static org.apache.cassandra.schema.SchemaConstants.VIRTUAL_VIEWS; |
| |
| /** |
| * Appends Cassandra logs to virtual table system_views.system_logs |
| */ |
| public final class VirtualTableAppender extends AppenderBase<LoggingEvent> |
| { |
| public static final String APPENDER_NAME = "CQLLOG"; |
| |
| private static final Set<String> forbiddenLoggers = ImmutableSet.of(FileAuditLogger.class.getName()); |
| |
| private LogMessagesTable logs; |
| |
| // for holding messages until virtual registry contains logs virtual table |
| // as it takes some time during startup of a node to initialise virtual tables but messages are |
| // logged already |
| private final List<LoggingEvent> messageBuffer = new LinkedList<>(); |
| |
| @Override |
| protected void append(LoggingEvent eventObject) |
| { |
| if (!forbiddenLoggers.contains(eventObject.getLoggerName())) |
| { |
| if (logs == null) |
| { |
| logs = getVirtualTable(); |
| if (logs == null) |
| addToBuffer(eventObject); |
| else |
| logs.add(eventObject); |
| } |
| else |
| logs.add(eventObject); |
| } |
| } |
| |
| @Override |
| public void stop() |
| { |
| messageBuffer.clear(); |
| super.stop(); |
| } |
| |
| /** |
| * Flushes all logs which were appended before virtual table was registered. |
| * |
| * @see org.apache.cassandra.service.CassandraDaemon#setupVirtualKeyspaces |
| */ |
| public void flushBuffer() |
| { |
| Optional.ofNullable(getVirtualTable()).ifPresent(vtable -> { |
| messageBuffer.forEach(vtable::add); |
| messageBuffer.clear(); |
| }); |
| } |
| |
| private LogMessagesTable getVirtualTable() |
| { |
| VirtualKeyspace keyspace = VirtualKeyspaceRegistry.instance.getKeyspaceNullable(VIRTUAL_VIEWS); |
| |
| if (keyspace == null) |
| return null; |
| |
| Optional<VirtualTable> logsTable = keyspace.tables() |
| .stream() |
| .filter(vt -> vt.name().equals(TABLE_NAME)) |
| .findFirst(); |
| |
| if (!logsTable.isPresent()) |
| return null; |
| |
| VirtualTable vt = logsTable.get(); |
| |
| if (!(vt instanceof LogMessagesTable)) |
| throw new IllegalStateException(String.format("Virtual table %s.%s is not backed by an instance of %s but by %s", |
| VIRTUAL_VIEWS, |
| TABLE_NAME, |
| LogMessagesTable.class.getName(), |
| vt.getClass().getName())); |
| |
| return (LogMessagesTable) vt; |
| } |
| |
| private void addToBuffer(LoggingEvent eventObject) |
| { |
| // we restrict how many logging events we can put into buffer, |
| // so we are not growing without any bound when things go south |
| if (messageBuffer.size() < LOGS_VIRTUAL_TABLE_DEFAULT_ROWS) |
| messageBuffer.add(eventObject); |
| } |
| } |