io.netty.handler.codec.haproxy

Class HAProxyMessageDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.haproxy.HAProxyMessageDecoder

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelInboundHandler

public class HAProxyMessageDecoder
extends io.netty.handler.codec.ByteToMessageDecoder

Decodes an HAProxy proxy protocol header

See Also:

Proxy Protocol Specification

Nested Class Summary

Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.ByteToMessageDecoder.Cumulator

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

io.netty.channel.ChannelHandler.Sharable

Field Summary

Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder

COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors

Constructor and Description
HAProxyMessageDecoder() Creates a new decoder with no additional data (TLV) restrictions, and should throw an exception as soon as we exceed maxLength.
HAProxyMessageDecoder(boolean failFast) Creates a new decoder with no additional data (TLV) restrictions, whether or not to throw an exception as soon as we exceed maxLength.
HAProxyMessageDecoder(int maxTlvSize) Creates a new decoder with restricted additional data (TLV) size, and should throw an exception as soon as we exceed maxLength.
HAProxyMessageDecoder(int maxTlvSize, boolean failFast) Creates a new decoder with restricted additional data (TLV) size, whether or not to throw an exception as soon as we exceed maxLength.

Method Summary

Modifier and Type	Method and Description
void	channelRead(io.netty.channel.ChannelHandlerContext ctx, Object msg)
protected void	decode(io.netty.channel.ChannelHandlerContext ctx, io.netty.buffer.ByteBuf in, List<Object> out)
static io.netty.handler.codec.ProtocolDetectionResult<HAProxyProtocolVersion>	detectProtocol(io.netty.buffer.ByteBuf buffer) Returns the ProtocolDetectionResult for the given ByteBuf.
boolean	isSingleDecode()

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder

actualReadableBytes, callDecode, channelInactive, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, isSharable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty.channel.ChannelHandler

handlerAdded

Constructor Detail

HAProxyMessageDecoder

public HAProxyMessageDecoder()

Creates a new decoder with no additional data (TLV) restrictions, and should throw an exception as soon as we exceed maxLength.

HAProxyMessageDecoder

public HAProxyMessageDecoder(boolean failFast)

Creates a new decoder with no additional data (TLV) restrictions, whether or not to throw an exception as soon as we exceed maxLength.

Parameters:

failFast - Whether or not to throw an exception as soon as we exceed maxLength

HAProxyMessageDecoder

public HAProxyMessageDecoder(int maxTlvSize)

Creates a new decoder with restricted additional data (TLV) size, and should throw an exception as soon as we exceed maxLength.

Note: limiting TLV size only affects processing of v2, binary headers. Also, as allowed by the 1.5 spec TLV data is currently ignored. For maximum performance it would be best to configure your upstream proxy host to NOT send TLV data and instantiate with a max TLV size of 0.

Parameters:

maxTlvSize - maximum number of bytes allowed for additional data (Type-Length-Value vectors) in a v2 header

HAProxyMessageDecoder

public HAProxyMessageDecoder(int maxTlvSize,
                             boolean failFast)

Creates a new decoder with restricted additional data (TLV) size, whether or not to throw an exception as soon as we exceed maxLength.

Parameters:

maxTlvSize - maximum number of bytes allowed for additional data (Type-Length-Value vectors) in a v2 header

failFast - Whether or not to throw an exception as soon as we exceed maxLength

Method Detail

isSingleDecode

public boolean isSingleDecode()

Overrides:

isSingleDecode in class io.netty.handler.codec.ByteToMessageDecoder

channelRead

public void channelRead(io.netty.channel.ChannelHandlerContext ctx,
                        Object msg)
                 throws Exception

Specified by:

channelRead in interface io.netty.channel.ChannelInboundHandler

Overrides:

channelRead in class io.netty.handler.codec.ByteToMessageDecoder

Throws:

Exception

decode

protected final void decode(io.netty.channel.ChannelHandlerContext ctx,
                            io.netty.buffer.ByteBuf in,
                            List<Object> out)
                     throws Exception

Specified by:

decode in class io.netty.handler.codec.ByteToMessageDecoder

Throws:

Exception

detectProtocol

public static io.netty.handler.codec.ProtocolDetectionResult<HAProxyProtocolVersion> detectProtocol(io.netty.buffer.ByteBuf buffer)

Returns the ProtocolDetectionResult for the given ByteBuf.