/*
* 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.transport.messages;
import java.util.List;
import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.CodecException;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Predicate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.cql3.functions.FunctionName;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.WriteType;
import org.apache.cassandra.exceptions.*;
import org.apache.cassandra.transport.*;
import org.apache.cassandra.utils.MD5Digest;
/**
* Message to indicate an error to the client.
*/
public class ErrorMessage extends Message.Response
{
private static final Logger logger = LoggerFactory.getLogger(ErrorMessage.class);
public static final Message.Codec<ErrorMessage> codec = new Message.Codec<ErrorMessage>()
{
public ErrorMessage decode(ByteBuf body, int version)
{
ExceptionCode code = ExceptionCode.fromValue(body.readInt());
String msg = CBUtil.readString(body);
TransportException te = null;
switch (code)
{
case SERVER_ERROR:
te = new ServerError(msg);
break;
case PROTOCOL_ERROR:
te = new ProtocolException(msg);
break;
case BAD_CREDENTIALS:
te = new AuthenticationException(msg);
break;
case UNAVAILABLE:
{
ConsistencyLevel cl = CBUtil.readConsistencyLevel(body);
int required = body.readInt();
int alive = body.readInt();
te = new UnavailableException(cl, required, alive);
}
break;
case OVERLOADED:
te = new OverloadedException(msg);
break;
case IS_BOOTSTRAPPING:
te = new IsBootstrappingException();
break;
case TRUNCATE_ERROR:
te = new TruncateException(msg);
break;
case WRITE_FAILURE:
case READ_FAILURE:
{
ConsistencyLevel cl = CBUtil.readConsistencyLevel(body);
int received = body.readInt();
int blockFor = body.readInt();
int failure = body.readInt();
if (code == ExceptionCode.WRITE_FAILURE)
{
WriteType writeType = Enum.valueOf(WriteType.class, CBUtil.readString(body));
te = new WriteFailureException(cl, received, failure, blockFor, writeType);
}
else
{
byte dataPresent = body.readByte();
te = new ReadFailureException(cl, received, failure, blockFor, dataPresent != 0);
}
}
break;
case WRITE_TIMEOUT:
case READ_TIMEOUT:
ConsistencyLevel cl = CBUtil.readConsistencyLevel(body);
int received = body.readInt();
int blockFor = body.readInt();
if (code == ExceptionCode.WRITE_TIMEOUT)
{
WriteType writeType = Enum.valueOf(WriteType.class, CBUtil.readString(body));
te = new WriteTimeoutException(writeType, cl, received, blockFor);
}
else
{
byte dataPresent = body.readByte();
te = new ReadTimeoutException(cl, received, blockFor, dataPresent != 0);
}
break;
case FUNCTION_FAILURE:
String fKeyspace = CBUtil.readString(body);
String fName = CBUtil.readString(body);
List<String> argTypes = CBUtil.readStringList(body);
te = new FunctionExecutionException(new FunctionName(fKeyspace, fName), argTypes, msg);
break;
case UNPREPARED:
{
MD5Digest id = MD5Digest.wrap(CBUtil.readBytes(body));
te = new PreparedQueryNotFoundException(id);
}
break;
case SYNTAX_ERROR:
te = new SyntaxException(msg);
break;
case UNAUTHORIZED:
te = new UnauthorizedException(msg);
break;
case INVALID:
te = new InvalidRequestException(msg);
break;
case CONFIG_ERROR:
te = new ConfigurationException(msg);
break;
case ALREADY_EXISTS:
String ksName = CBUtil.readString(body);
String cfName = CBUtil.readString(body);
if (cfName.isEmpty())
te = new AlreadyExistsException(ksName);
else
te = new AlreadyExistsException(ksName, cfName);
break;
}
return new ErrorMessage(te);
}
public void encode(ErrorMessage msg, ByteBuf dest, int version)
{
final TransportException err = getBackwardsCompatibleException(msg, version);
dest.writeInt(err.code().value);
String errorString = err.getMessage() == null ? "" : err.getMessage();
CBUtil.writeString(errorString, dest);
switch (err.code())
{
case UNAVAILABLE:
UnavailableException ue = (UnavailableException)err;
CBUtil.writeConsistencyLevel(ue.consistency, dest);
dest.writeInt(ue.required);
dest.writeInt(ue.alive);
break;
case WRITE_FAILURE:
case READ_FAILURE:
{
RequestFailureException rfe = (RequestFailureException)err;
boolean isWrite = err.code() == ExceptionCode.WRITE_FAILURE;
CBUtil.writeConsistencyLevel(rfe.consistency, dest);
dest.writeInt(rfe.received);
dest.writeInt(rfe.blockFor);
dest.writeInt(rfe.failures);
if (isWrite)
CBUtil.writeString(((WriteFailureException)rfe).writeType.toString(), dest);
else
dest.writeByte((byte)(((ReadFailureException)rfe).dataPresent ? 1 : 0));
}
break;
case WRITE_TIMEOUT:
case READ_TIMEOUT:
RequestTimeoutException rte = (RequestTimeoutException)err;
boolean isWrite = err.code() == ExceptionCode.WRITE_TIMEOUT;
CBUtil.writeConsistencyLevel(rte.consistency, dest);
dest.writeInt(rte.received);
dest.writeInt(rte.blockFor);
if (isWrite)
CBUtil.writeString(((WriteTimeoutException)rte).writeType.toString(), dest);
else
dest.writeByte((byte)(((ReadTimeoutException)rte).dataPresent ? 1 : 0));
break;
case FUNCTION_FAILURE:
FunctionExecutionException fee = (FunctionExecutionException)msg.error;
CBUtil.writeString(fee.functionName.keyspace, dest);
CBUtil.writeString(fee.functionName.name, dest);
CBUtil.writeStringList(fee.argTypes, dest);
break;
case UNPREPARED:
PreparedQueryNotFoundException pqnfe = (PreparedQueryNotFoundException)err;
CBUtil.writeBytes(pqnfe.id.bytes, dest);
break;
case ALREADY_EXISTS:
AlreadyExistsException aee = (AlreadyExistsException)err;
CBUtil.writeString(aee.ksName, dest);
CBUtil.writeString(aee.cfName, dest);
break;
}
}
public int encodedSize(ErrorMessage msg, int version)
{
final TransportException err = getBackwardsCompatibleException(msg, version);
String errorString = err.getMessage() == null ? "" : err.getMessage();
int size = 4 + CBUtil.sizeOfString(errorString);
switch (err.code())
{
case UNAVAILABLE:
UnavailableException ue = (UnavailableException)err;
size += CBUtil.sizeOfConsistencyLevel(ue.consistency) + 8;
break;
case WRITE_FAILURE:
case READ_FAILURE:
{
RequestFailureException rfe = (RequestFailureException)err;
boolean isWrite = err.code() == ExceptionCode.WRITE_FAILURE;
size += CBUtil.sizeOfConsistencyLevel(rfe.consistency) + 4 + 4 + 4;
size += isWrite ? CBUtil.sizeOfString(((WriteFailureException)rfe).writeType.toString()) : 1;
}
break;
case WRITE_TIMEOUT:
case READ_TIMEOUT:
RequestTimeoutException rte = (RequestTimeoutException)err;
boolean isWrite = err.code() == ExceptionCode.WRITE_TIMEOUT;
size += CBUtil.sizeOfConsistencyLevel(rte.consistency) + 8;
size += isWrite ? CBUtil.sizeOfString(((WriteTimeoutException)rte).writeType.toString()) : 1;
break;
case FUNCTION_FAILURE:
FunctionExecutionException fee = (FunctionExecutionException)msg.error;
size += CBUtil.sizeOfString(fee.functionName.keyspace);
size += CBUtil.sizeOfString(fee.functionName.name);
size += CBUtil.sizeOfStringList(fee.argTypes);
break;
case UNPREPARED:
PreparedQueryNotFoundException pqnfe = (PreparedQueryNotFoundException)err;
size += CBUtil.sizeOfBytes(pqnfe.id.bytes);
break;
case ALREADY_EXISTS:
AlreadyExistsException aee = (AlreadyExistsException)err;
size += CBUtil.sizeOfString(aee.ksName);
size += CBUtil.sizeOfString(aee.cfName);
break;
}
return size;
}
};
private static TransportException getBackwardsCompatibleException(ErrorMessage msg, int version)
{
if (version < Server.VERSION_4)
{
switch (msg.error.code())
{
case READ_FAILURE:
ReadFailureException rfe = (ReadFailureException) msg.error;
return new ReadTimeoutException(rfe.consistency, rfe.received, rfe.blockFor, rfe.dataPresent);
case WRITE_FAILURE:
WriteFailureException wfe = (WriteFailureException) msg.error;
return new WriteTimeoutException(wfe.writeType, wfe.consistency, wfe.received, wfe.blockFor);
case FUNCTION_FAILURE:
return new InvalidRequestException(msg.toString());
}
}
return msg.error;
}
// We need to figure error codes out (#3979)
public final TransportException error;
private ErrorMessage(TransportException error)
{
super(Message.Type.ERROR);
this.error = error;
}
private ErrorMessage(TransportException error, int streamId)
{
this(error);
setStreamId(streamId);
}
public static ErrorMessage fromException(Throwable e)
{
return fromException(e, null);
}
/**
* @param e the exception
* @param unexpectedExceptionHandler a callback for handling unexpected exceptions. If null, or if this
* returns false, the error is logged at ERROR level via sl4fj
*/
public static ErrorMessage fromException(Throwable e, Predicate<Throwable> unexpectedExceptionHandler)
{
int streamId = 0;
// Netty will wrap exceptions during decoding in a CodecException. If the cause was one of our ProtocolExceptions
// or some other internal exception, extract that and use it.
if (e instanceof CodecException)
{
Throwable cause = e.getCause();
if (cause != null)
{
if (cause instanceof WrappedException)
{
streamId = ((WrappedException) cause).streamId;
e = cause.getCause();
}
else if (cause instanceof TransportException)
{
e = cause;
}
}
}
else if (e instanceof WrappedException)
{
streamId = ((WrappedException)e).streamId;
e = e.getCause();
}
if (e instanceof TransportException)
{
ErrorMessage message = new ErrorMessage((TransportException) e, streamId);
if (e instanceof ProtocolException)
{
// if the driver attempted to connect with a protocol version lower than the minimum supported
// version, respond with a protocol error message with the correct frame header for that version
Integer attemptedLowProtocolVersion = ((ProtocolException) e).getAttemptedLowProtocolVersion();
if (attemptedLowProtocolVersion != null)
message.forcedProtocolVersion = attemptedLowProtocolVersion;
}
return message;
}
// Unexpected exception
if (unexpectedExceptionHandler == null || !unexpectedExceptionHandler.apply(e))
logger.error("Unexpected exception during request", e);
return new ErrorMessage(new ServerError(e), streamId);
}
@Override
public String toString()
{
return "ERROR " + error.code() + ": " + error.getMessage();
}
public static RuntimeException wrap(Throwable t, int streamId)
{
return new WrappedException(t, streamId);
}
public static class WrappedException extends RuntimeException
{
private final int streamId;
public WrappedException(Throwable cause, int streamId)
{
super(cause);
this.streamId = streamId;
}
@VisibleForTesting
public int getStreamId()
{
return this.streamId;
}
}
}