package org.infinispan.client.hotrod.impl.protocol;
import org.infinispan.client.hotrod.exceptions.HotRodClientException;
import org.infinispan.client.hotrod.exceptions.InvalidResponseException;
import org.infinispan.client.hotrod.exceptions.RemoteNodeSuspectException;
import org.infinispan.client.hotrod.impl.transport.Transport;
import org.infinispan.client.hotrod.logging.Log;
import org.infinispan.client.hotrod.logging.LogFactory;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import static org.infinispan.commons.util.Util.hexDump;
/**
* A Hot Rod encoder/decoder for version 2.0 of the protocol.
*
* @author Galder Zamarreño
* @since 7.0
*/
public class Codec20 implements Codec {
private static final Log log = LogFactory.getLog(Codec20.class, Log.class);
static final AtomicLong MSG_ID = new AtomicLong();
final boolean trace = getLog().isTraceEnabled();
@Override
public HeaderParams writeHeader(Transport transport, HeaderParams params) {
return writeHeader(transport, params, HotRodConstants.VERSION_20);
}
protected HeaderParams writeHeader(
Transport transport, HeaderParams params, byte version) {
transport.writeByte(HotRodConstants.REQUEST_MAGIC);
transport.writeVLong(params.messageId(MSG_ID.incrementAndGet()).messageId);
transport.writeByte(version);
transport.writeByte(params.opCode);
transport.writeArray(params.cacheName);
int joinedFlags = HeaderParams.joinFlags(params.flags);
transport.writeVInt(joinedFlags);
transport.writeByte(params.clientIntel);
transport.writeVInt(params.topologyId.get());
if (trace)
getLog().tracef("Wrote header for message %d. Operation code: %#04x. Flags: %#x",
params.messageId, params.opCode, joinedFlags);
return params;
}
@Override
public short readHeader(Transport transport, HeaderParams params) {
short magic = transport.readByte();
final Log localLog = getLog();
if (magic != HotRodConstants.RESPONSE_MAGIC) {
String message = "Invalid magic number. Expected %#x and received %#x";
localLog.invalidMagicNumber(HotRodConstants.RESPONSE_MAGIC, magic);
if (trace)
localLog.tracef("Socket dump: %s", hexDump(transport.dumpStream()));
throw new InvalidResponseException(String.format(message, HotRodConstants.RESPONSE_MAGIC, magic));
}
long receivedMessageId = transport.readVLong();
// If received id is 0, it could be that a failure was noted before the
// message id was detected, so don't consider it to a message id error
if (receivedMessageId != params.messageId && receivedMessageId != 0) {
String message = "Invalid message id. Expected %d and received %d";
localLog.invalidMessageId(params.messageId, receivedMessageId);
if (trace)
localLog.tracef("Socket dump: %s", hexDump(transport.dumpStream()));
throw new InvalidResponseException(String.format(message, params.messageId, receivedMessageId));
}
if (trace)
localLog.tracef("Received response for message id: %d", receivedMessageId);
short receivedOpCode = transport.readByte();
// Read both the status and new topology (if present),
// before deciding how to react to error situations.
short status = transport.readByte();
readNewTopologyIfPresent(transport, params);
// Now that all headers values have been read, check the error responses.
// This avoids situatiations where an exceptional return ends up with
// the socket containing data from previous request responses.
if (receivedOpCode != params.opRespCode) {
if (receivedOpCode == HotRodConstants.ERROR_RESPONSE) {
checkForErrorsInResponseStatus(transport, params, status);
}
throw new InvalidResponseException(String.format(
"Invalid response operation. Expected %#x and received %#x",
params.opRespCode, receivedOpCode));
}
if (trace)
localLog.tracef("Received operation code is: %#04x", receivedOpCode);
return status;
}
@Override
public Log getLog() {
return log;
}
protected void checkForErrorsInResponseStatus(Transport transport, HeaderParams params, short status) {
final Log localLog = getLog();
boolean isTrace = localLog.isTraceEnabled();
if (isTrace) localLog.tracef("Received operation status: %#x", status);
try {
switch (status) {
case HotRodConstants.INVALID_MAGIC_OR_MESSAGE_ID_STATUS:
case HotRodConstants.REQUEST_PARSING_ERROR_STATUS:
case HotRodConstants.UNKNOWN_COMMAND_STATUS:
case HotRodConstants.SERVER_ERROR_STATUS:
case HotRodConstants.COMMAND_TIMEOUT_STATUS:
case HotRodConstants.UNKNOWN_VERSION_STATUS: {
// If error, the body of the message just contains a message
String msgFromServer = transport.readString();
if (status == HotRodConstants.COMMAND_TIMEOUT_STATUS && isTrace) {
localLog.tracef("Server-side timeout performing operation: %s", msgFromServer);
} if (msgFromServer.contains("SuspectException")
|| msgFromServer.contains("SuspectedException")) {
// Handle both Infinispan's and JGroups' suspicions
if (isTrace)
localLog.tracef("A remote node was suspected while executing messageId=%d. " +
"Check if retry possible. Message from server: %s", params.messageId, msgFromServer);
// TODO: This will be better handled with its own status id in version 2 of protocol
throw new RemoteNodeSuspectException(msgFromServer, params.messageId, status);
} else {
localLog.errorFromServer(msgFromServer);
}
throw new HotRodClientException(msgFromServer, params.messageId, status);
}
default: {
throw new IllegalStateException(String.format("Unknown status: %#04x", status));
}
}
} finally {
// Errors related to protocol parsing are odd, and they can sometimes
// be the consequence of previous errors, so whenever these errors
// occur, invalidate the underlying transport instance so that a
// brand new connection is established next time around.
switch (status) {
case HotRodConstants.INVALID_MAGIC_OR_MESSAGE_ID_STATUS:
case HotRodConstants.REQUEST_PARSING_ERROR_STATUS:
case HotRodConstants.UNKNOWN_COMMAND_STATUS:
case HotRodConstants.UNKNOWN_VERSION_STATUS: {
transport.invalidate();
}
}
}
}
protected void readNewTopologyIfPresent(Transport transport, HeaderParams params) {
short topologyChangeByte = transport.readByte();
if (topologyChangeByte == 1)
readNewTopologyAndHash(transport, params.topologyId);
}
protected void readNewTopologyAndHash(Transport transport, AtomicInteger topologyId) {
final Log localLog = getLog();
int newTopologyId = transport.readVInt();
topologyId.set(newTopologyId);
int clusterSize = transport.readVInt();
SocketAddress[] addresses = new SocketAddress[clusterSize];
for (int i = 0; i < clusterSize; i++) {
String host = transport.readString();
int port = transport.readUnsignedShort();
addresses[i] = new InetSocketAddress(host, port);
}
short hashFunctionVersion = transport.readByte();
int numSegments = transport.readVInt();
SocketAddress[][] segmentOwners = new SocketAddress[numSegments][];
for (int i = 0; i < numSegments; i++) {
short numOwners = transport.readByte();
segmentOwners[i] = new SocketAddress[numOwners];
for (int j = 0; j < numOwners; j++) {
int memberIndex = transport.readVInt();
segmentOwners[i][j] = addresses[memberIndex];
}
}
List<SocketAddress> addressList = Arrays.asList(addresses);
if (localLog.isInfoEnabled()) {
localLog.newTopology(transport.getRemoteSocketAddress(), newTopologyId,
addresses.length, new HashSet<SocketAddress>(addressList));
}
transport.getTransportFactory().updateServers(addressList);
if (hashFunctionVersion == 0) {
if (trace)
localLog.trace("Not using a consistent hash function (hash function version == 0).");
} else {
transport.getTransportFactory().updateHashFunction(segmentOwners, numSegments, hashFunctionVersion);
}
}
}