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/*
* Copyright 2014 Red Hat, Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* The Apache License v2.0 is available at
* http://www.opensource.org/licenses/apache2.0.php
*
* You may elect to redistribute this code under either of these licenses.
*/
package io.vertx.ext.web.sstore;
import io.vertx.codegen.annotations.Nullable;
import io.vertx.core.VertxException;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.json.JsonObject;
import io.vertx.core.shareddata.ClusterSerializable;
import io.vertx.ext.auth.VertxContextPRNG;
import io.vertx.ext.web.Session;
import io.vertx.ext.web.impl.Utils;
import io.vertx.ext.web.sstore.impl.SessionInternal;
import java.lang.reflect.InvocationTargetException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
/**
* The abstract session class provides a barebones implementation for session storage implementors.
*
* This class will contain all the related data required for a session plus a couple of helper methods to verify the
* integrity and versioning of the data. This checksum is important to reduce the amount of times data is pushed to
* be stored on a backend.
*
* As a Vert.x Web user, you should not have to deal with this class directly but with the public interface that it
* implements.
*
* @author Paulo Lopes
*/
public abstract class AbstractSession implements Session, SessionInternal {
private static final Charset UTF8 = StandardCharsets.UTF_8;
private static final byte TYPE_LONG = 1;
private static final byte TYPE_INT = 2;
private static final byte TYPE_SHORT = 3;
private static final byte TYPE_BYTE = 4;
private static final byte TYPE_DOUBLE = 5;
private static final byte TYPE_FLOAT = 6;
private static final byte TYPE_CHAR = 7;
private static final byte TYPE_BOOLEAN = 8;
private static final byte TYPE_STRING = 9;
private static final byte TYPE_BUFFER = 10;
private static final byte TYPE_BYTES = 11;
private static final byte TYPE_CLUSTER_SERIALIZABLE = 13;
private static final char[] HEX = "0123456789abcdef".toCharArray();
private VertxContextPRNG prng;
private String id;
private long timeout;
private volatile Map data;
private long lastAccessed;
private int version;
protected void setId(String id) {
this.id = id;
}
protected void setTimeout(long timeout) {
this.timeout = timeout;
}
protected void setData(Map data) {
if (data != null) {
this.data = data;
this.crc = checksum();
}
}
protected void setData(JsonObject data) {
if (data != null) {
setData(data.getMap());
}
}
protected void setLastAccessed(long lastAccessed) {
this.lastAccessed = lastAccessed;
}
protected void setVersion(int version) {
this.version = version;
}
// state management
private boolean destroyed;
private boolean renewed;
private String oldId;
private int crc;
/**
* This constructor is mandatory (even though not referenced anywhere) is required for
* serialization purposes. Do not remove. It is required as part of the contract of the ClusterSerializable
* interface which some implementations might require.
*/
public AbstractSession() {
}
public AbstractSession(VertxContextPRNG random) {
this.prng = random;
}
public AbstractSession(VertxContextPRNG random, long timeout, int length) {
this.prng = random;
this.id = generateId(prng, length);
this.timeout = timeout;
this.lastAccessed = System.currentTimeMillis();
}
public void setPRNG(VertxContextPRNG prng) {
this.prng = prng;
}
@Override
public void flushed(boolean skipCrc) {
renewed = false;
if (oldId != null) {
if (!skipCrc) {
crc = checksum();
}
oldId = null;
}
}
@Override
public String id() {
return id;
}
@Override
public Session regenerateId() {
if (oldId == null) {
// keep track of just the first one since the
// regeneration during the remaining lifecycle are ephemeral
oldId = id;
}
// ids are stored in hex, so the original size is half of the hex encoded length
id = generateId(prng, oldId.length() / 2);
renewed = true;
return this;
}
@Override
public long timeout() {
return timeout;
}
@Override
@SuppressWarnings("unchecked")
public @Nullable T get(String key) {
if (isEmpty()) {
return null;
}
Object obj = data().get(key);
return (T) obj;
}
@Override
public Session put(String key, Object obj) {
final Map data = data();
// nulls are handled as remove actions
if (obj == null) {
data.remove(key);
} else {
data.put(key, obj);
}
return this;
}
@Override
public Session putIfAbsent(String key, Object obj) {
data()
.putIfAbsent(key, obj);
return this;
}
@Override
public Session computeIfAbsent(String key, Function mappingFunction) {
data()
.computeIfAbsent(key, mappingFunction);
return this;
}
@Override
@SuppressWarnings("unchecked")
public @Nullable T remove(String key) {
if (isEmpty()) {
return null;
}
Object obj = data().remove(key);
return (T) obj;
}
@Override
public Map data() {
if (data == null) {
synchronized (this) {
// double check since there could already been someone in the lock
if (data == null) {
if (destroyed) {
// pretty much should behave as a regeneration
regenerateId();
destroyed = false;
}
// delay the assignment to avoid potential races
data = new ConcurrentHashMap<>();
}
}
}
return data;
}
@Override
public boolean isEmpty() {
return data == null || data.size() == 0;
}
@Override
public long lastAccessed() {
return lastAccessed;
}
@Override
public void setAccessed() {
this.lastAccessed = System.currentTimeMillis();
}
@Override
public void destroy() {
synchronized (this) {
destroyed = true;
data = null;
}
}
@Override
public boolean isDestroyed() {
return destroyed;
}
@Override
public boolean isRegenerated() {
return renewed;
}
@Override
public String oldId() {
return oldId;
}
public int version() {
return version;
}
public void incrementVersion() {
int old = this.crc;
// update the checksum
crc = checksum();
if (this.crc != old) {
++version;
}
}
private static String generateId(VertxContextPRNG rng, int length) {
final byte[] bytes = new byte[length];
rng.nextBytes(bytes);
final char[] hex = new char[length * 2];
for (int j = 0; j < length; j++) {
int v = bytes[j] & 0xFF;
hex[j * 2] = HEX[v >>> 4];
hex[j * 2 + 1] = HEX[v & 0x0F];
}
return new String(hex);
}
protected int crc() {
return crc;
}
protected int checksum() {
if (isEmpty()) {
return 0x0000;
} else {
int result = 1;
for (Map.Entry kv : data.entrySet()) {
String key = kv.getKey();
result = 31 * result + key.hashCode();
Object value = kv.getValue();
if (value != null) {
result = 31 * result + value.hashCode();
}
}
return result;
}
}
protected void writeDataToBuffer(Buffer buffer) {
if (isEmpty()) {
buffer.appendInt(0);
} else {
final Map data = data();
buffer.appendInt(data.size());
for (Map.Entry entry : data.entrySet()) {
String key = entry.getKey();
byte[] keyBytes = key.getBytes(UTF8);
buffer.appendInt(keyBytes.length).appendBytes(keyBytes);
Object val = entry.getValue();
if (val instanceof Long) {
buffer.appendByte(TYPE_LONG).appendLong((long) val);
} else if (val instanceof Integer) {
buffer.appendByte(TYPE_INT).appendInt((int) val);
} else if (val instanceof Short) {
buffer.appendByte(TYPE_SHORT).appendShort((short) val);
} else if (val instanceof Byte) {
buffer.appendByte(TYPE_BYTE).appendByte((byte) val);
} else if (val instanceof Double) {
buffer.appendByte(TYPE_DOUBLE).appendDouble((double) val);
} else if (val instanceof Float) {
buffer.appendByte(TYPE_FLOAT).appendFloat((float) val);
} else if (val instanceof Character) {
buffer.appendByte(TYPE_CHAR).appendShort((short) ((Character) val).charValue());
} else if (val instanceof Boolean) {
buffer.appendByte(TYPE_BOOLEAN).appendByte((byte) ((boolean) val ? 1 : 0));
} else if (val instanceof String) {
byte[] bytes = ((String) val).getBytes(UTF8);
buffer.appendByte(TYPE_STRING).appendInt(bytes.length).appendBytes(bytes);
} else if (val instanceof Buffer) {
Buffer buff = (Buffer) val;
buffer.appendByte(TYPE_BUFFER).appendInt(buff.length()).appendBuffer(buff);
} else if (val instanceof byte[]) {
byte[] bytes = (byte[]) val;
buffer.appendByte(TYPE_BYTES).appendInt(bytes.length).appendBytes(bytes);
} else if (val instanceof ClusterSerializable) {
buffer.appendByte(TYPE_CLUSTER_SERIALIZABLE);
String className = val.getClass().getName();
byte[] classNameBytes = className.getBytes(UTF8);
buffer.appendInt(classNameBytes.length).appendBytes(classNameBytes);
((ClusterSerializable) val).writeToBuffer(buffer);
} else {
if (val != null) {
throw new IllegalStateException("Invalid type for data in session: " + val.getClass());
}
}
}
}
}
protected int readDataFromBuffer(int pos, Buffer buffer) {
try {
int entries = buffer.getInt(pos);
pos += 4;
if (entries > 0) {
final Map data = new ConcurrentHashMap<>(entries);
for (int i = 0; i < entries; i++) {
int keylen = buffer.getInt(pos);
pos += 4;
byte[] keyBytes = buffer.getBytes(pos, pos + keylen);
pos += keylen;
String key = new String(keyBytes, UTF8);
byte type = buffer.getByte(pos++);
Object val;
switch (type) {
case TYPE_LONG:
val = buffer.getLong(pos);
pos += 8;
break;
case TYPE_INT:
val = buffer.getInt(pos);
pos += 4;
break;
case TYPE_SHORT:
val = buffer.getShort(pos);
pos += 2;
break;
case TYPE_BYTE:
val = buffer.getByte(pos);
pos++;
break;
case TYPE_FLOAT:
val = buffer.getFloat(pos);
pos += 4;
break;
case TYPE_DOUBLE:
val = buffer.getDouble(pos);
pos += 8;
break;
case TYPE_CHAR:
short s = buffer.getShort(pos);
pos += 2;
val = (char) s;
break;
case TYPE_BOOLEAN:
byte b = buffer.getByte(pos);
pos++;
val = b == 1;
break;
case TYPE_STRING:
int len = buffer.getInt(pos);
pos += 4;
byte[] bytes = buffer.getBytes(pos, pos + len);
val = new String(bytes, UTF8);
pos += len;
break;
case TYPE_BUFFER:
len = buffer.getInt(pos);
pos += 4;
bytes = buffer.getBytes(pos, pos + len);
val = Buffer.buffer(bytes);
pos += len;
break;
case TYPE_BYTES:
len = buffer.getInt(pos);
pos += 4;
val = buffer.getBytes(pos, pos + len);
pos += len;
break;
case TYPE_CLUSTER_SERIALIZABLE:
int classNameLen = buffer.getInt(pos);
pos += 4;
byte[] classNameBytes = buffer.getBytes(pos, pos + classNameLen);
pos += classNameLen;
String className = new String(classNameBytes, UTF8);
Class clazz = Utils.getClassLoader().loadClass(className);
if (!ClusterSerializable.class.isAssignableFrom(clazz)) {
throw new ClassCastException(new String(classNameBytes, StandardCharsets.UTF_8) + " is not assignable from ClusterSerializable");
}
ClusterSerializable obj = (ClusterSerializable) clazz.getDeclaredConstructor().newInstance();
pos = obj.readFromBuffer(pos, buffer);
val = obj;
break;
default:
throw new IllegalStateException("Invalid serialized type: " + type);
}
data.put(key, val);
}
setData(data);
}
return pos;
} catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException | InstantiationException e) {
throw new VertxException(e);
}
}
protected void readDataFromBuffer(Buffer buffer) {
readDataFromBuffer(0, buffer);
}
}
