/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.nio.ascii;
import com.hazelcast.internal.ascii.CommandParser;
import com.hazelcast.internal.ascii.TextCommand;
import com.hazelcast.internal.ascii.TextCommandService;
import com.hazelcast.internal.ascii.memcache.DeleteCommandParser;
import com.hazelcast.internal.ascii.memcache.ErrorCommand;
import com.hazelcast.internal.ascii.memcache.GetCommandParser;
import com.hazelcast.internal.ascii.memcache.IncrementCommandParser;
import com.hazelcast.internal.ascii.memcache.SetCommandParser;
import com.hazelcast.internal.ascii.memcache.SimpleCommandParser;
import com.hazelcast.internal.ascii.memcache.TouchCommandParser;
import com.hazelcast.internal.ascii.rest.HttpCommand;
import com.hazelcast.internal.ascii.rest.HttpCommandProcessor;
import com.hazelcast.internal.ascii.rest.HttpDeleteCommandParser;
import com.hazelcast.internal.ascii.rest.HttpGetCommandParser;
import com.hazelcast.internal.ascii.rest.HttpPostCommandParser;
import com.hazelcast.internal.networking.ChannelInboundHandler;
import com.hazelcast.logging.ILogger;
import com.hazelcast.nio.ConnectionType;
import com.hazelcast.nio.IOService;
import com.hazelcast.nio.tcp.TcpIpConnection;
import com.hazelcast.spi.annotation.PrivateApi;
import com.hazelcast.util.StringUtil;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.ADD;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.APPEND;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.DECREMENT;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.ERROR_CLIENT;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.INCREMENT;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.PREPEND;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.QUIT;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.REPLACE;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.SET;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.STATS;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.TOUCH;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.UNKNOWN;
import static com.hazelcast.internal.ascii.TextCommandConstants.TextCommandType.VERSION;
@PrivateApi
public class TextChannelInboundHandler implements ChannelInboundHandler {
private static final Map<String, CommandParser> MAP_COMMAND_PARSERS = new HashMap<String, CommandParser>();
@SuppressWarnings("checkstyle:magicnumber")
private static final int INITIAL_CAPACITY = 1 << 8;
// 65536, no specific reason, similar to UDP packet size limit
@SuppressWarnings("checkstyle:magicnumber")
private static final int MAX_CAPACITY = 1 << 16;
static {
MAP_COMMAND_PARSERS.put("get", new GetCommandParser());
MAP_COMMAND_PARSERS.put("gets", new GetCommandParser());
MAP_COMMAND_PARSERS.put("set", new SetCommandParser(SET));
MAP_COMMAND_PARSERS.put("add", new SetCommandParser(ADD));
MAP_COMMAND_PARSERS.put("replace", new SetCommandParser(REPLACE));
MAP_COMMAND_PARSERS.put("append", new SetCommandParser(APPEND));
MAP_COMMAND_PARSERS.put("prepend", new SetCommandParser(PREPEND));
MAP_COMMAND_PARSERS.put("touch", new TouchCommandParser(TOUCH));
MAP_COMMAND_PARSERS.put("incr", new IncrementCommandParser(INCREMENT));
MAP_COMMAND_PARSERS.put("decr", new IncrementCommandParser(DECREMENT));
MAP_COMMAND_PARSERS.put("delete", new DeleteCommandParser());
MAP_COMMAND_PARSERS.put("quit", new SimpleCommandParser(QUIT));
MAP_COMMAND_PARSERS.put("stats", new SimpleCommandParser(STATS));
MAP_COMMAND_PARSERS.put("version", new SimpleCommandParser(VERSION));
MAP_COMMAND_PARSERS.put("GET", new HttpGetCommandParser());
MAP_COMMAND_PARSERS.put("POST", new HttpPostCommandParser());
MAP_COMMAND_PARSERS.put("PUT", new HttpPostCommandParser());
MAP_COMMAND_PARSERS.put("DELETE", new HttpDeleteCommandParser());
}
private ByteBuffer commandLineBuffer = ByteBuffer.allocate(INITIAL_CAPACITY);
private boolean commandLineRead;
private TextCommand command;
private final TextCommandService textCommandService;
private final TextChannelOutboundHandler textWriteHandler;
private final TcpIpConnection connection;
private final boolean restEnabled;
private final boolean memcacheEnabled;
private final boolean healthcheckEnabled;
private boolean connectionTypeSet;
private long requestIdGen;
private final ILogger logger;
public TextChannelInboundHandler(TcpIpConnection connection) {
IOService ioService = connection.getConnectionManager().getIoService();
this.textCommandService = ioService.getTextCommandService();
this.textWriteHandler = (TextChannelOutboundHandler) connection.getChannelWriter().getOutboundHandler();
this.connection = connection;
this.memcacheEnabled = ioService.isMemcacheEnabled();
this.restEnabled = ioService.isRestEnabled();
this.healthcheckEnabled = ioService.isHealthcheckEnabled();
this.logger = ioService.getLoggingService().getLogger(getClass());
}
public void sendResponse(TextCommand command) {
textWriteHandler.enqueue(command);
}
@Override
public void onRead(ByteBuffer src) throws Exception {
while (src.hasRemaining()) {
doRead(src);
}
}
private void doRead(ByteBuffer bb) throws IOException {
while (!commandLineRead && bb.hasRemaining()) {
byte b = bb.get();
char c = (char) b;
if (c == '\n') {
commandLineRead = true;
} else if (c != '\r') {
appendToBuffer(b);
}
}
if (commandLineRead) {
if (command == null) {
processCmd(toStringAndClear(commandLineBuffer));
}
if (command != null) {
boolean complete = command.readFrom(bb);
if (complete) {
publishRequest(command);
reset();
}
} else {
reset();
}
}
}
private void appendToBuffer(byte b) throws IOException {
if (!commandLineBuffer.hasRemaining()) {
expandBuffer();
}
commandLineBuffer.put(b);
}
private void expandBuffer() throws IOException {
if (commandLineBuffer.capacity() == MAX_CAPACITY) {
throw new IOException("Max command size capacity [" + MAX_CAPACITY + "] has been reached!");
}
int capacity = commandLineBuffer.capacity() << 1;
if (logger.isFineEnabled()) {
logger.fine("Expanding buffer capacity to " + capacity);
}
ByteBuffer newBuffer = ByteBuffer.allocate(capacity);
commandLineBuffer.flip();
newBuffer.put(commandLineBuffer);
commandLineBuffer = newBuffer;
}
private void reset() {
command = null;
commandLineBuffer.clear();
commandLineRead = false;
}
private static String toStringAndClear(ByteBuffer bb) {
if (bb == null) {
return "";
}
String result;
if (bb.position() == 0) {
result = "";
} else {
result = StringUtil.bytesToString(bb.array(), 0, bb.position());
}
bb.clear();
return result;
}
public void publishRequest(TextCommand command) {
if (!isCommandTypeEnabled(command)) {
return;
}
long requestId = (command.shouldReply()) ? requestIdGen++ : -1;
command.init(this, requestId);
textCommandService.processRequest(command);
}
private boolean isCommandTypeEnabled(TextCommand command) {
if (!connectionTypeSet) {
if (command instanceof HttpCommand) {
String uri = ((HttpCommand) command).getURI();
boolean isMancenterRequest = uri.startsWith(HttpCommandProcessor.URI_MANCENTER_CHANGE_URL);
boolean isClusterManagementRequest = uri.startsWith(HttpCommandProcessor.URI_CLUSTER_MANAGEMENT_BASE_URL);
boolean isHealthCheck = healthcheckEnabled && uri.startsWith(HttpCommandProcessor.URI_HEALTH_URL);
boolean forceRequestHandling = isClusterManagementRequest || isMancenterRequest || isHealthCheck;
if (!restEnabled && !forceRequestHandling) {
connection.close("REST not enabled", null);
return false;
}
connection.setType(ConnectionType.REST_CLIENT);
} else {
if (!memcacheEnabled) {
connection.close("Memcached not enabled", null);
return false;
}
connection.setType(ConnectionType.MEMCACHE_CLIENT);
}
connectionTypeSet = true;
}
return true;
}
private void processCmd(String cmd) {
try {
int space = cmd.indexOf(' ');
String operation = (space == -1) ? cmd : cmd.substring(0, space);
CommandParser commandParser = MAP_COMMAND_PARSERS.get(operation);
if (commandParser != null) {
command = commandParser.parser(this, cmd, space);
} else {
command = new ErrorCommand(UNKNOWN);
}
} catch (Throwable t) {
logger.finest(t);
command = new ErrorCommand(ERROR_CLIENT, "Invalid command: " + cmd);
}
}
public TextChannelOutboundHandler getTextWriteHandler() {
return textWriteHandler;
}
public void closeConnection() {
connection.close(null, null);
}
}