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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.
// Copyright (c) 2007-2023 VMware, Inc. or its affiliates. All rights reserved.
//
// This software, the RabbitMQ Java client library, is triple-licensed under the
// Mozilla Public License 2.0 ("MPL"), the GNU General Public License version 2
// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2. For the ASL,
// please see LICENSE-APACHE2.
//
// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
// either express or implied. See the LICENSE file for specific language governing
// rights and limitations of this software.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].
package com.rabbitmq.client.impl;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.LongString;
import com.rabbitmq.client.MalformedFrameException;
import java.io.*;
import java.math.BigDecimal;
import java.net.SocketTimeoutException;
import java.util.Date;
import java.util.List;
import java.util.Map;
import static java.lang.String.format;
/**
* Represents an AMQP wire-protocol frame, with frame type, channel number, and payload bytes.
* TODO: make state private
*/
public class Frame {
/** Frame type code */
public final int type;
/** Frame channel number, 0-65535 */
public final int channel;
/** Frame payload bytes (for inbound frames) */
private final byte[] payload;
/** Frame payload (for outbound frames) */
private final ByteArrayOutputStream accumulator;
private static final int NON_BODY_SIZE = 1 /* type */ + 2 /* channel */ + 4 /* payload size */ + 1 /* end character */;
/**
* Constructs a frame for output with a type and a channel number and a
* fresh accumulator waiting for payload.
*/
public Frame(int type, int channel) {
this.type = type;
this.channel = channel;
this.payload = null;
this.accumulator = new ByteArrayOutputStream();
}
/**
* Constructs a frame for input with a type, a channel number and a
* payload byte array.
*/
public Frame(int type, int channel, byte[] payload) {
this.type = type;
this.channel = channel;
this.payload = payload;
this.accumulator = null;
}
public static Frame fromBodyFragment(int channelNumber, byte[] body, int offset, int length)
throws IOException
{
Frame frame = new Frame(AMQP.FRAME_BODY, channelNumber);
DataOutputStream bodyOut = frame.getOutputStream();
bodyOut.write(body, offset, length);
return frame;
}
/**
* Protected API - Factory method to instantiate a Frame by reading an
* AMQP-wire-protocol frame from the given input stream.
*
* @return a new Frame if we read a frame successfully, otherwise null
*/
public static Frame readFrom(DataInputStream is, int maxPayloadSize) throws IOException {
int type;
int channel;
try {
type = is.readUnsignedByte();
} catch (SocketTimeoutException ste) {
// System.err.println("Timed out waiting for a frame.");
return null; // failed
}
if (type == 'A') {
/*
* Probably an AMQP.... header indicating a version
* mismatch.
*/
/*
* Otherwise meaningless, so try to read the version,
* and throw an exception, whether we read the version
* okay or not.
*/
protocolVersionMismatch(is);
}
channel = is.readUnsignedShort();
int payloadSize = is.readInt();
if (payloadSize >= maxPayloadSize) {
throw new IllegalStateException(format(
"Frame body is too large (%d), maximum configured size is %d. " +
"See ConnectionFactory#setMaxInboundMessageBodySize " +
"if you need to increase the limit.",
payloadSize, maxPayloadSize
));
}
byte[] payload = new byte[payloadSize];
is.readFully(payload);
int frameEndMarker = is.readUnsignedByte();
if (frameEndMarker != AMQP.FRAME_END) {
throw new MalformedFrameException("Bad frame end marker: " + frameEndMarker);
}
return new Frame(type, channel, payload);
}
/**
* Private API - A protocol version mismatch is detected by checking the
* three next bytes if a frame type of (int)'A' is read from an input
* stream. If the next three bytes are 'M', 'Q' and 'P', then it's
* likely the broker is trying to tell us we are speaking the wrong AMQP
* protocol version.
*
* @throws MalformedFrameException
* if an AMQP protocol version mismatch is detected
* @throws MalformedFrameException
* if a corrupt AMQP protocol identifier is read
*/
public static void protocolVersionMismatch(DataInputStream is) throws IOException {
MalformedFrameException x;
// We expect the letters M, Q, P in that order: generate an informative error if they're not found
byte[] expectedBytes = new byte[] { 'M', 'Q', 'P' };
for (byte expectedByte : expectedBytes) {
int nextByte = is.readUnsignedByte();
if (nextByte != expectedByte) {
throw new MalformedFrameException("Invalid AMQP protocol header from server: expected character " +
expectedByte + ", got " + nextByte);
}
}
try {
int[] signature = new int[4];
for (int i = 0; i < 4; i++) {
signature[i] = is.readUnsignedByte();
}
if (signature[0] == 1 &&
signature[1] == 1 &&
signature[2] == 8 &&
signature[3] == 0) {
x = new MalformedFrameException("AMQP protocol version mismatch; we are version " +
AMQP.PROTOCOL.MAJOR + "-" + AMQP.PROTOCOL.MINOR + "-" + AMQP.PROTOCOL.REVISION +
", server is 0-8");
}
else {
String sig = "";
for (int i = 0; i < 4; i++) {
if (i != 0) sig += ",";
sig += signature[i];
}
x = new MalformedFrameException("AMQP protocol version mismatch; we are version " +
AMQP.PROTOCOL.MAJOR + "-" + AMQP.PROTOCOL.MINOR + "-" + AMQP.PROTOCOL.REVISION +
", server sent signature " + sig);
}
} catch (IOException ex) {
x = new MalformedFrameException("Invalid AMQP protocol header from server");
}
throw x;
}
/**
* Public API - writes this Frame to the given DataOutputStream
*/
public void writeTo(DataOutputStream os) throws IOException {
os.writeByte(type);
os.writeShort(channel);
if (accumulator != null) {
os.writeInt(accumulator.size());
accumulator.writeTo(os);
} else {
os.writeInt(payload.length);
os.write(payload);
}
os.write(AMQP.FRAME_END);
}
public int size() {
if(accumulator != null) {
return accumulator.size() + NON_BODY_SIZE;
} else {
return payload.length + NON_BODY_SIZE;
}
}
/**
* Public API - retrieves the frame payload
*/
public byte[] getPayload() {
if (payload != null) return payload;
// This is a Frame we've constructed ourselves. For some reason (e.g.
// testing), we're acting as if we received it even though it
// didn't come in off the wire.
return accumulator.toByteArray();
}
/**
* Public API - retrieves a new DataInputStream streaming over the payload
*/
public DataInputStream getInputStream() {
return new DataInputStream(new ByteArrayInputStream(getPayload()));
}
/**
* Public API - retrieves a fresh DataOutputStream streaming into the accumulator
*/
public DataOutputStream getOutputStream() {
return new DataOutputStream(accumulator);
}
@Override public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Frame(type=").append(type).append(", channel=").append(channel).append(", ");
if (accumulator == null) {
sb.append(payload.length).append(" bytes of payload)");
} else {
sb.append(accumulator.size()).append(" bytes of accumulator)");
}
return sb.toString();
}
/** Computes the AMQP wire-protocol length of protocol-encoded table entries.
*/
public static long tableSize(Map table)
throws UnsupportedEncodingException
{
long acc = 0;
for(Map.Entry entry: table.entrySet()) {
acc += shortStrSize(entry.getKey());
acc += fieldValueSize(entry.getValue());
}
return acc;
}
/** Computes the AMQP wire-protocol length of a protocol-encoded field-value. */
private static long fieldValueSize(Object value)
throws UnsupportedEncodingException
{
long acc = 1; // for the type tag
if(value instanceof String) {
acc += longStrSize((String)value);
}
else if(value instanceof LongString) {
acc += 4 + ((LongString)value).length();
}
else if(value instanceof Integer) {
acc += 4;
}
else if(value instanceof BigDecimal) {
acc += 5;
}
else if(value instanceof Date) {
acc += 8;
}
else if(value instanceof Map) {
@SuppressWarnings("unchecked")
Map map = (Map) value;
acc += 4 + tableSize(map);
}
else if (value instanceof Byte) {
acc += 1;
}
else if(value instanceof Double) {
acc += 8;
}
else if(value instanceof Float) {
acc += 4;
}
else if(value instanceof Long) {
acc += 8;
}
else if(value instanceof Short) {
acc += 2;
}
else if(value instanceof Boolean) {
acc += 1;
}
else if(value instanceof byte[]) {
acc += 4 + ((byte[])value).length;
}
else if(value instanceof List) {
acc += 4 + arraySize((List)value);
}
else if(value instanceof Object[]) {
acc += 4 + arraySize((Object[])value);
}
else if(value == null) {
}
else {
throw new IllegalArgumentException("invalid value in table");
}
return acc;
}
/** Computes the AMQP 0-9-1 wire-protocol length of an encoded field-array of type List */
public static long arraySize(List values)
throws UnsupportedEncodingException
{
long acc = 0;
for (Object value : values) {
acc += fieldValueSize(value);
}
return acc;
}
/** Computes the AMQP wire-protocol length of an encoded field-array of type Object[] */
public static long arraySize(Object[] values) throws UnsupportedEncodingException {
long acc = 0;
for (Object value : values) {
acc += fieldValueSize(value);
}
return acc;
}
/** Computes the AMQP wire-protocol length of a protocol-encoded long string. */
private static int longStrSize(String str)
throws UnsupportedEncodingException
{
return str.getBytes("utf-8").length + 4;
}
/** Computes the AMQP wire-protocol length of a protocol-encoded short string. */
private static int shortStrSize(String str)
throws UnsupportedEncodingException
{
return str.getBytes("utf-8").length + 1;
}
}