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/*
* Copyright 2014-2024 Real Logic Limited.
*
* 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
*
* https://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 io.aeron.driver.media;
import io.aeron.Aeron;
import io.aeron.ChannelUri;
import io.aeron.driver.DefaultNameResolver;
import io.aeron.driver.NameResolver;
import io.aeron.driver.exceptions.InvalidChannelException;
import org.agrona.BitUtil;
import org.agrona.SystemUtil;
import java.net.*;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import static io.aeron.CommonContext.*;
import static io.aeron.driver.media.NetworkUtil.*;
import static java.lang.System.lineSeparator;
import static java.net.InetAddress.getByAddress;
/**
* The media configuration for Aeron UDP channels as an instantiation of the socket addresses for a {@link ChannelUri}.
*
* @see ChannelUri
* @see io.aeron.ChannelUriStringBuilder
*/
public final class UdpChannel
{
/**
* The offset from the beginning of a payload where the reserved value begins.
*/
public static final int RESERVED_VALUE_MESSAGE_OFFSET = -8;
private static final AtomicInteger UNIQUE_CANONICAL_FORM_VALUE = new AtomicInteger();
private static final InetSocketAddress ANY_IPV4 = new InetSocketAddress("0.0.0.0", 0);
private static final InetSocketAddress ANY_IPV6 = new InetSocketAddress("::", 0);
private final ControlMode controlMode;
private final boolean hasExplicitControl;
private final boolean hasExplicitEndpoint;
private final boolean isMulticast;
private final boolean hasMulticastTtl;
private final boolean hasTag;
private final int multicastTtl;
private final int socketRcvbufLength;
private final int socketSndbufLength;
private final int receiverWindowLength;
private final long tag;
private final InetSocketAddress remoteData;
private final InetSocketAddress localData;
private final InetSocketAddress remoteControl;
private final InetSocketAddress localControl;
private final String uriStr;
private final String canonicalForm;
private final NetworkInterface localInterface;
private final ProtocolFamily protocolFamily;
private final ChannelUri channelUri;
private final int channelReceiveTimestampOffset;
private final int channelSendTimestampOffset;
private final Long groupTag;
private final Long nakDelayNs;
private UdpChannel(final Context context)
{
controlMode = context.controlMode;
hasExplicitEndpoint = context.hasExplicitEndpoint;
hasExplicitControl = context.hasExplicitControl;
isMulticast = context.isMulticast;
hasTag = context.hasTagId;
tag = context.tagId;
hasMulticastTtl = context.hasMulticastTtl;
multicastTtl = context.multicastTtl;
remoteData = context.remoteData;
localData = context.localData;
remoteControl = context.remoteControl;
localControl = context.localControl;
uriStr = context.uriStr;
canonicalForm = context.canonicalForm;
localInterface = context.localInterface;
protocolFamily = context.protocolFamily;
channelUri = context.channelUri;
socketRcvbufLength = context.socketRcvbufLength;
socketSndbufLength = context.socketSndbufLength;
receiverWindowLength = context.receiverWindowLength;
channelReceiveTimestampOffset = context.channelReceiveTimestampOffset;
channelSendTimestampOffset = context.channelSendTimestampOffset;
groupTag = context.groupTag;
nakDelayNs = context.nakDelayNs;
}
/**
* Parse channel URI and create a {@link UdpChannel} using the default name resolver.
*
* @param channelUriString to parse.
* @return a new {@link UdpChannel} as the result of parsing.
* @throws InvalidChannelException if an error occurs.
*/
public static UdpChannel parse(final String channelUriString)
{
return parse(channelUriString, DefaultNameResolver.INSTANCE, false);
}
/**
* Parse channel URI and create a {@link UdpChannel}.
*
* @param channelUriString to parse.
* @param nameResolver to use for resolving names.
* @return a new {@link UdpChannel} as the result of parsing.
* @throws InvalidChannelException if an error occurs.
*/
public static UdpChannel parse(final String channelUriString, final NameResolver nameResolver)
{
return parse(channelUriString, nameResolver, false);
}
/**
* Parse channel URI and create a {@link UdpChannel}.
*
* @param channelUriString to parse.
* @param nameResolver to use for resolving names.
* @param isDestination to identify if it is a destination within a channel.
* @return a new {@link UdpChannel} as the result of parsing.
* @throws InvalidChannelException if an error occurs.
*/
@SuppressWarnings("MethodLength")
public static UdpChannel parse(
final String channelUriString, final NameResolver nameResolver, final boolean isDestination)
{
try
{
final ChannelUri channelUri = ChannelUri.parse(channelUriString);
validateConfiguration(channelUri);
InetSocketAddress endpointAddress = getEndpointAddress(channelUri, nameResolver);
final InetSocketAddress controlAddress = getExplicitControlAddress(channelUri, nameResolver);
final String tagIdStr = channelUri.channelTag();
final ControlMode controlMode = parseControlMode(channelUri);
final int socketRcvbufLength = parseBufferLength(channelUri, SOCKET_RCVBUF_PARAM_NAME);
final int socketSndbufLength = parseBufferLength(channelUri, SOCKET_SNDBUF_PARAM_NAME);
final int receiverWindowLength = parseBufferLength(
channelUri, RECEIVER_WINDOW_LENGTH_PARAM_NAME);
final boolean requiresAdditionalSuffix = !isDestination &&
(null == endpointAddress && null == controlAddress ||
(null != endpointAddress && endpointAddress.getPort() == 0) ||
(null != controlAddress && controlAddress.getPort() == 0));
final boolean hasNoDistinguishingCharacteristic =
null == endpointAddress && null == controlAddress && null == tagIdStr;
if (ControlMode.DYNAMIC == controlMode && null == controlAddress)
{
throw new IllegalArgumentException(
"explicit control expected with dynamic control mode: " + channelUriString);
}
if (hasNoDistinguishingCharacteristic && ControlMode.MANUAL != controlMode &&
ControlMode.RESPONSE != controlMode)
{
throw new IllegalArgumentException(
"URIs for UDP must specify an endpoint, control, tags, or control-mode=manual/response: " +
channelUriString);
}
if (null != endpointAddress && endpointAddress.isUnresolved())
{
throw new UnknownHostException("could not resolve endpoint address: " + endpointAddress);
}
if (null != controlAddress && controlAddress.isUnresolved())
{
throw new UnknownHostException("could not resolve control address: " + controlAddress);
}
boolean hasExplicitEndpoint = true;
if (null == endpointAddress)
{
hasExplicitEndpoint = false;
endpointAddress = null != controlAddress && controlAddress.getAddress() instanceof Inet6Address ?
ANY_IPV6 : ANY_IPV4;
}
final Context context = new Context()
.isMulticast(false)
.hasExplicitControl(false)
.hasMulticastTtl(false)
.hasTagId(false)
.uriStr(channelUriString)
.channelUri(channelUri)
.controlMode(controlMode)
.hasExplicitEndpoint(hasExplicitEndpoint)
.hasNoDistinguishingCharacteristic(hasNoDistinguishingCharacteristic)
.socketRcvbufLength(socketRcvbufLength)
.socketSndbufLength(socketSndbufLength)
.receiverWindowLength(receiverWindowLength)
.nakDelayNs(parseOptionalDurationNs(channelUri, NAK_DELAY_PARAM_NAME));
if (null != tagIdStr)
{
context.hasTagId(true).tagId(Long.parseLong(tagIdStr));
}
if (endpointAddress.getAddress().isMulticastAddress())
{
final InterfaceSearchAddress searchAddress = getInterfaceSearchAddress(channelUri);
final NetworkInterface localInterface = findInterface(searchAddress);
final InetSocketAddress resolvedAddress = resolveToAddressOfInterface(localInterface, searchAddress);
context
.isMulticast(true)
.localControlAddress(resolvedAddress)
.remoteControlAddress(getMulticastControlAddress(endpointAddress))
.localDataAddress(resolvedAddress)
.remoteDataAddress(endpointAddress)
.localInterface(localInterface)
.protocolFamily(getProtocolFamily(endpointAddress.getAddress()))
.canonicalForm(canonicalise(null, resolvedAddress, null, endpointAddress));
final String ttlValue = channelUri.get(TTL_PARAM_NAME);
if (null != ttlValue)
{
context.hasMulticastTtl(true).multicastTtl(Integer.parseInt(ttlValue));
}
}
else if (null != controlAddress)
{
final String controlVal = channelUri.get(MDC_CONTROL_PARAM_NAME);
final String endpointVal = channelUri.get(ENDPOINT_PARAM_NAME);
String suffix = "";
if (requiresAdditionalSuffix)
{
suffix = null != tagIdStr ? "#" + tagIdStr : "-" + UNIQUE_CANONICAL_FORM_VALUE.getAndAdd(1);
}
final String canonicalForm = canonicalise(
controlVal, controlAddress, endpointVal, endpointAddress) + suffix;
context
.hasExplicitControl(true)
.remoteControlAddress(endpointAddress)
.remoteDataAddress(endpointAddress)
.localControlAddress(controlAddress)
.localDataAddress(controlAddress)
.protocolFamily(getProtocolFamily(endpointAddress.getAddress()))
.canonicalForm(canonicalForm);
}
else
{
final InterfaceSearchAddress searchAddress = getInterfaceSearchAddress(channelUri);
final InetSocketAddress localAddress = searchAddress.getInetAddress().isAnyLocalAddress() ?
searchAddress.getAddress() :
resolveToAddressOfInterface(findInterface(searchAddress), searchAddress);
final String endpointVal = channelUri.get(ENDPOINT_PARAM_NAME);
String suffix = "";
if (requiresAdditionalSuffix)
{
suffix = (null != tagIdStr) ? "#" + tagIdStr : ("-" + UNIQUE_CANONICAL_FORM_VALUE.getAndAdd(1));
}
context
.remoteControlAddress(endpointAddress)
.remoteDataAddress(endpointAddress)
.localControlAddress(localAddress)
.localDataAddress(localAddress)
.protocolFamily(getProtocolFamily(endpointAddress.getAddress()))
.canonicalForm(canonicalise(null, localAddress, endpointVal, endpointAddress) + suffix);
}
context.channelReceiveTimestampOffset(
parseTimestampOffset(channelUri, CHANNEL_RECEIVE_TIMESTAMP_OFFSET_PARAM_NAME));
context.channelSendTimestampOffset(
parseTimestampOffset(channelUri, CHANNEL_SEND_TIMESTAMP_OFFSET_PARAM_NAME));
final Long groupTag = parseOptionalLong(channelUri, GROUP_TAG_PARAM_NAME);
context.groupTag(groupTag);
return new UdpChannel(context);
}
catch (final Exception ex)
{
throw new InvalidChannelException(ex);
}
}
private static int parseTimestampOffset(final ChannelUri channelUri, final String timestampOffsetParamName)
{
final String offsetStr = channelUri.get(timestampOffsetParamName);
if (null == offsetStr)
{
return Aeron.NULL_VALUE;
}
else if (RESERVED_OFFSET.equals(offsetStr))
{
return RESERVED_VALUE_MESSAGE_OFFSET;
}
else
{
try
{
return Integer.parseInt(offsetStr);
}
catch (final NumberFormatException ex)
{
throw new IllegalArgumentException(
"timestamp offset must be a valid integer or the 'reserved' keyword", ex);
}
}
}
private static Long parseOptionalLong(final ChannelUri channelUri, final String paramName)
{
final String longAsString = channelUri.get(paramName);
if (null == longAsString)
{
return null;
}
try
{
return Long.valueOf(longAsString);
}
catch (final NumberFormatException ex)
{
throw new IllegalArgumentException("'" + paramName + "' does not contain a valid long value", ex);
}
}
/**
* Parse a buffer length for a given URI paramName with a format specified by
* {@link SystemUtil#parseSize(String, String)}, clamping the range to 0 <= x <= Integer.MAX_VALUE.
*
* @param channelUri to get the value from.
* @param paramName key for the parameter.
* @return value as an integer.
* @see SystemUtil#parseSize(String, String)
*/
public static int parseBufferLength(final ChannelUri channelUri, final String paramName)
{
int socketBufferLength = 0;
final String paramValue = channelUri.get(paramName);
if (null != paramValue)
{
final long size = SystemUtil.parseSize(paramName, paramValue);
if (size < 0 || size > Integer.MAX_VALUE)
{
throw new IllegalArgumentException("Invalid " + paramName + " length: " + size);
}
socketBufferLength = (int)size;
}
return socketBufferLength;
}
/**
* Parse the control mode from the channel URI. If the value is null or unknown then {@link ControlMode#NONE} will
* be used.
*
* @param channelUri to parse the control mode from.
* @return an enum value representing the control mode.
*/
public static ControlMode parseControlMode(final ChannelUri channelUri)
{
final String paramValue = channelUri.get(MDC_CONTROL_MODE_PARAM_NAME);
if (null == paramValue)
{
return ControlMode.NONE;
}
switch (paramValue)
{
case MDC_CONTROL_MODE_DYNAMIC:
return ControlMode.DYNAMIC;
case MDC_CONTROL_MODE_MANUAL:
return ControlMode.MANUAL;
case CONTROL_MODE_RESPONSE:
return ControlMode.RESPONSE;
default:
return ControlMode.NONE;
}
}
/**
* Parses out a duration from a channel URI and caters for unit suffix information.
*
* @param channelUri to read the value from
* @param paramName specific field to access in the URI
* @return duration in nanoseconds, null if not present
*/
public static Long parseOptionalDurationNs(final ChannelUri channelUri, final String paramName)
{
final String valueStr = channelUri.get(paramName);
if (null == valueStr)
{
return null;
}
return SystemUtil.parseDuration(paramName, valueStr);
}
/**
* Return a string which is a canonical form of the channel suitable for use as a file or directory
* name and also as a method of hashing, etc.
*
* The general format is:
* UDP-interface:localPort-remoteAddress:remotePort
*
* @param localParamValue interface or MDC control param value or null for not set.
* @param localData address/interface for the channel.
* @param remoteParamValue endpoint param value or null if not set.
* @param remoteData address for the channel.
* @return canonical representation as a string.
*/
public static String canonicalise(
final String localParamValue,
final InetSocketAddress localData,
final String remoteParamValue,
final InetSocketAddress remoteData)
{
final StringBuilder builder = new StringBuilder(48);
builder.append("UDP-");
if (null == localParamValue)
{
builder.append(localData.getHostString())
.append(':')
.append(localData.getPort());
}
else
{
builder.append(localParamValue);
}
builder.append('-');
if (null == remoteParamValue)
{
builder.append(remoteData.getHostString())
.append(':')
.append(remoteData.getPort());
}
else
{
builder.append(remoteParamValue);
}
return builder.toString();
}
/**
* Remote data address and port.
*
* @return remote data address and port.
*/
public InetSocketAddress remoteData()
{
return remoteData;
}
/**
* Local data address and port.
*
* @return local data address port.
*/
public InetSocketAddress localData()
{
return localData;
}
/**
* Remote control address information.
*
* @return remote control address information.
*/
public InetSocketAddress remoteControl()
{
return remoteControl;
}
/**
* Local control address and port.
*
* @return local control address and port.
*/
public InetSocketAddress localControl()
{
return localControl;
}
/**
* Get the {@link ChannelUri} for this channel.
*
* @return the {@link ChannelUri} for this channel.
*/
public ChannelUri channelUri()
{
return channelUri;
}
/**
* Has this channel got a multicast TTL value set so that {@link #multicastTtl()} is valid.
*
* @return true if this channel is a multicast TTL set otherwise false.
*/
public boolean hasMulticastTtl()
{
return hasMulticastTtl;
}
/**
* Multicast TTL value.
*
* @return multicast TTL value.
*/
public int multicastTtl()
{
return multicastTtl;
}
/**
* The canonical form for the channel.
*
* @return canonical form for channel.
* @see UdpChannel#canonicalise
*/
public String canonicalForm()
{
return canonicalForm;
}
/**
* The {@link #canonicalForm()} for the channel.
*
* @return the {@link #canonicalForm()} for the channel.
*/
public String toString()
{
return canonicalForm;
}
/**
* Is the channel UDP multicast.
*
* @return true if the channel is UDP multicast.
*/
public boolean isMulticast()
{
return isMulticast;
}
/**
* Local interface to be used by the channel.
*
* @return {@link NetworkInterface} for the local interface used by the channel.
*/
public NetworkInterface localInterface()
{
return localInterface;
}
/**
* Original URI of the channel URI.
*
* @return the original uri string from the client.
*/
public String originalUriString()
{
return uriStr;
}
/**
* Get the {@link ProtocolFamily} for this channel.
*
* @return the {@link ProtocolFamily} for this channel.
*/
public ProtocolFamily protocolFamily()
{
return protocolFamily;
}
/**
* Get the tag value on the channel which is only valid if {@link #hasTag()} is true.
*
* @return the tag value on the channel.
*/
public long tag()
{
return tag;
}
/**
* The channel's control mode.
*
* @return the control mode for the channel.
*/
public ControlMode controlMode()
{
return controlMode;
}
/**
* Does the channel have manual control mode specified.
*
* @return does channel have manual control mode specified.
*/
public boolean isManualControlMode()
{
return ControlMode.MANUAL == controlMode;
}
/**
* Does the channel have dynamic control mode specified.
*
* @return does channel have dynamic control mode specified.
*/
public boolean isDynamicControlMode()
{
return ControlMode.DYNAMIC == controlMode;
}
/**
* Does the channel have response control mode specified.
*
* @return does the channel have response control mode specified.
*/
public boolean isResponseControlMode()
{
return ControlMode.RESPONSE == controlMode;
}
/**
* Does the channel have an explicit endpoint address?
*
* @return does channel have an explicit endpoint address or not?
*/
public boolean hasExplicitEndpoint()
{
return hasExplicitEndpoint;
}
/**
* Does the channel have an explicit control address as used with multi-destination-cast or not?
*
* @return does channel have an explicit control address or not?
*/
public boolean hasExplicitControl()
{
return hasExplicitControl;
}
/**
* Has the URI a tag to indicate entity relationships and if {@link #tag()} is valid.
*
* @return true if the channel has a tag.
*/
public boolean hasTag()
{
return hasTag;
}
/**
* Is the channel configured as multi-destination.
*
* @return true if the channel configured as multi-destination.
*/
public boolean isMultiDestination()
{
return controlMode.isMultiDestination();
}
/**
* Does the channel have group semantics (multicast or MDC).
*
* @return true if the channel has group semantics.
*/
public boolean hasGroupSemantics()
{
return isMulticast || isMultiDestination();
}
/**
* Get the socket receive buffer length.
*
* @return socket receive buffer length or 0 if not specified.
*/
public int socketRcvbufLength()
{
return socketRcvbufLength;
}
/**
* Get the socket receive buffer length.
*
* @param defaultValue to be used if the UdpChannel's value is 0 (unspecified).
* @return socket receive buffer length or 0 if not specified.
*/
public int socketRcvbufLengthOrDefault(final int defaultValue)
{
return 0 != socketRcvbufLength ? socketRcvbufLength : defaultValue;
}
/**
* Get the socket send buffer length.
*
* @return socket send buffer length or 0 if not specified.
*/
public int socketSndbufLength()
{
return socketSndbufLength;
}
/**
* Get the socket send buffer length.
*
* @param defaultValue to be used if the UdpChannel's value is 0 (unspecified).
* @return socket send buffer length or defaultValue if not specified.
*/
public int socketSndbufLengthOrDefault(final int defaultValue)
{
return 0 != socketSndbufLength ? socketSndbufLength : defaultValue;
}
/**
* Get the receiver window length used as the initial window length for congestion control.
*
* @return receiver window length or 0 if not specified.
*/
public int receiverWindowLength()
{
return receiverWindowLength;
}
/**
* Get the receiver window length used as the initial window length for congestion control.
*
* @param defaultValue to be used if the UdpChannel's value is 0 (unspecified).
* @return receiver window length or defaultValue if not specified.
*/
public int receiverWindowLengthOrDefault(final int defaultValue)
{
return 0 != receiverWindowLength() ? receiverWindowLength() : defaultValue;
}
/**
* The length of the initial nak delay to be used by the LossDectector on this channel.
*
* @return delay in nanoseconds or null if the value is not set.
*/
public Long nakDelayNs()
{
return nakDelayNs;
}
/**
* Does this channel have a tag match to another channel having INADDR_ANY endpoints.
*
* @param udpChannel to match against.
* @return true if there is a match otherwise false.
*/
public boolean matchesTag(final UdpChannel udpChannel)
{
if (!hasTag || !udpChannel.hasTag() || tag != udpChannel.tag())
{
return false;
}
if (!matchesControlMode(udpChannel))
{
throw new IllegalArgumentException(
"matching tag=" + tag + " has mismatched control-mode: " + uriStr + " <> " + udpChannel.uriStr);
}
if (!hasMatchingAddress(udpChannel))
{
throw new IllegalArgumentException(
"matching tag=" + tag + " has mismatched endpoint or control: " + uriStr + " <> " + udpChannel.uriStr);
}
return true;
}
private boolean hasMatchingAddress(final UdpChannel udpChannel)
{
final boolean otherChannelIsWildcard = udpChannel.remoteData().getAddress().isAnyLocalAddress() &&
udpChannel.remoteData().getPort() == 0 &&
udpChannel.localData().getAddress().isAnyLocalAddress() &&
udpChannel.localData().getPort() == 0;
final boolean otherChannelMatches = udpChannel.remoteData().getAddress().equals(remoteData.getAddress()) &&
udpChannel.remoteData().getPort() == remoteData.getPort() &&
udpChannel.localData().getAddress().equals(localData.getAddress()) &&
udpChannel.localData().getPort() == localData.getPort();
return otherChannelIsWildcard || otherChannelMatches;
}
private boolean matchesControlMode(final UdpChannel udpChannel)
{
return udpChannel.controlMode() == ControlMode.NONE || controlMode() == udpChannel.controlMode();
}
/**
* Used for debugging to get a human-readable description of the channel.
*
* @return a human-readable description of the channel.
*/
public String description()
{
return "localData: " + formatAddressAndPort(localData.getAddress(), localData.getPort()) +
", remoteData: " + formatAddressAndPort(remoteData.getAddress(), remoteData.getPort()) +
", ttl: " + multicastTtl;
}
/**
* Channels are considered equal if the {@link #canonicalForm()} is equal.
*
* @param o object to be compared with.
* @return true if the {@link #canonicalForm()} is equal, otherwise false.
*/
public boolean equals(final Object o)
{
if (this == o)
{
return true;
}
if (o == null || getClass() != o.getClass())
{
return false;
}
final UdpChannel that = (UdpChannel)o;
return Objects.equals(canonicalForm, that.canonicalForm);
}
/**
* The hash code for the {@link #canonicalForm()}.
*
* @return the hash code for the {@link #canonicalForm()}.
*/
public int hashCode()
{
return canonicalForm != null ? canonicalForm.hashCode() : 0;
}
/**
* Get the endpoint destination address from the URI.
*
* @param uri to check.
* @param nameResolver to use for resolution.
* @return endpoint address for URI.
*/
public static InetSocketAddress destinationAddress(final ChannelUri uri, final NameResolver nameResolver)
{
try
{
validateConfiguration(uri);
final String endpointValue = uri.get(ENDPOINT_PARAM_NAME);
return SocketAddressParser.parse(endpointValue, ENDPOINT_PARAM_NAME, false, nameResolver);
}
catch (final Exception ex)
{
throw new InvalidChannelException(ex);
}
}
/**
* Check if the address pointed to by the endpoint is multicast.
*
* @param uri to check.
* @return {@code true} if the destination uses multicast address.
* @since 1.44.0
*/
public static boolean isMulticastDestinationAddress(final ChannelUri uri)
{
try
{
validateConfiguration(uri);
final String endpointValue = uri.get(ENDPOINT_PARAM_NAME);
return SocketAddressParser.isMulticastAddress(endpointValue);
}
catch (final Exception ex)
{
throw new InvalidChannelException(ex);
}
}
/**
* Resolve and endpoint into a {@link InetSocketAddress}.
*
* @param endpoint to resolve.
* @param uriParamName for the resolution.
* @param isReResolution for the resolution.
* @param nameResolver to be used for hostname.
* @return address for endpoint.
*/
public static InetSocketAddress resolve(
final String endpoint, final String uriParamName, final boolean isReResolution, final NameResolver nameResolver)
{
return SocketAddressParser.parse(endpoint, uriParamName, isReResolution, nameResolver);
}
/**
* Offset to store the channel receive timestamp in a user message.
*
* @return offset of channel receive timestamps.
*/
public int channelReceiveTimestampOffset()
{
return channelReceiveTimestampOffset;
}
/**
* Check if channel receive timestamps should be recorded.
*
* @return true if channel receive timestamps should be collected false otherwise.
*/
public boolean isChannelReceiveTimestampEnabled()
{
return RESERVED_VALUE_MESSAGE_OFFSET == channelReceiveTimestampOffset || 0 <= channelReceiveTimestampOffset;
}
/**
* Check if channel send timestamps should be recorded.
*
* @return true if channel send timestamps should be collected false otherwise.
*/
public boolean isChannelSendTimestampEnabled()
{
return RESERVED_VALUE_MESSAGE_OFFSET == channelSendTimestampOffset || 0 <= channelSendTimestampOffset;
}
/**
* Offset to store the channel send timestamp in a user message.
*
* @return offset of channel send timestamps.
*/
public int channelSendTimestampOffset()
{
return channelSendTimestampOffset;
}
/**
* Group tag specified for this channel or null if not specified.
*
* @return group tag for the channel
*/
public Long groupTag()
{
return groupTag;
}
private static InetSocketAddress getMulticastControlAddress(final InetSocketAddress endpointAddress)
throws UnknownHostException
{
final byte[] addressAsBytes = endpointAddress.getAddress().getAddress();
validateDataAddress(addressAsBytes);
addressAsBytes[addressAsBytes.length - 1]++;
return new InetSocketAddress(getByAddress(addressAsBytes), endpointAddress.getPort());
}
private static InterfaceSearchAddress getInterfaceSearchAddress(final ChannelUri uri) throws UnknownHostException
{
final String interfaceValue = uri.get(INTERFACE_PARAM_NAME);
if (null != interfaceValue)
{
return InterfaceSearchAddress.parse(interfaceValue);
}
return InterfaceSearchAddress.wildcard();
}
private static InetSocketAddress getEndpointAddress(final ChannelUri uri, final NameResolver nameResolver)
throws UnknownHostException
{
InetSocketAddress address = null;
final String endpointValue = uri.get(ENDPOINT_PARAM_NAME);
if (null != endpointValue)
{
address = SocketAddressParser.parse(
endpointValue, ENDPOINT_PARAM_NAME, false, nameResolver);
if (address.isUnresolved())
{
throw new UnknownHostException(
"unresolved - " + ENDPOINT_PARAM_NAME + "=" + endpointValue +
", name-resolver=" + nameResolver.getClass().getName());
}
}
return address;
}
private static InetSocketAddress getExplicitControlAddress(final ChannelUri uri, final NameResolver nameResolver)
throws UnknownHostException
{
InetSocketAddress address = null;
final String controlValue = uri.get(MDC_CONTROL_PARAM_NAME);
if (null != controlValue)
{
address = SocketAddressParser.parse(
controlValue, MDC_CONTROL_PARAM_NAME, false, nameResolver);
if (address.isUnresolved())
{
throw new UnknownHostException(
"unresolved - " + MDC_CONTROL_PARAM_NAME + "=" + controlValue +
", name-resolver=" + nameResolver.getClass().getName());
}
}
return address;
}
private static void validateDataAddress(final byte[] addressAsBytes)
{
if (BitUtil.isEven(addressAsBytes[addressAsBytes.length - 1]))
{
throw new IllegalArgumentException("multicast data address must be odd");
}
}
private static void validateConfiguration(final ChannelUri uri)
{
validateMedia(uri);
}
private static void validateMedia(final ChannelUri uri)
{
if (!uri.isUdp())
{
throw new IllegalArgumentException("UdpChannel only supports UDP media: " + uri);
}
}
private static InetSocketAddress resolveToAddressOfInterface(
final NetworkInterface localInterface, final InterfaceSearchAddress searchAddress)
{
final InetAddress interfaceAddress = findAddressOnInterface(
localInterface, searchAddress.getInetAddress(), searchAddress.getSubnetPrefix());
if (null == interfaceAddress)
{
throw new IllegalStateException();
}
return new InetSocketAddress(interfaceAddress, searchAddress.getPort());
}
private static NetworkInterface findInterface(final InterfaceSearchAddress searchAddress)
throws SocketException
{
final NetworkInterface[] filteredInterfaces = filterBySubnet(
searchAddress.getInetAddress(), searchAddress.getSubnetPrefix());
for (final NetworkInterface networkInterface : filteredInterfaces)
{
if (networkInterface.isUp() && (networkInterface.supportsMulticast() || networkInterface.isLoopback()))
{
return networkInterface;
}
}
throw new IllegalArgumentException(noMatchingInterfacesError(filteredInterfaces, searchAddress));
}
private static String noMatchingInterfacesError(
final NetworkInterface[] filteredInterfaces, final InterfaceSearchAddress address)
throws SocketException
{
final StringBuilder builder = new StringBuilder()
.append("Unable to find multicast interface matching criteria: ")
.append(address.getAddress())
.append('/')
.append(address.getSubnetPrefix());
if (filteredInterfaces.length > 0)
{
builder.append(lineSeparator()).append(" Candidates:");
for (final NetworkInterface ifc : filteredInterfaces)
{
builder
.append(lineSeparator())
.append(" - Name: ")
.append(ifc.getDisplayName())
.append(", addresses: ")
.append(ifc.getInterfaceAddresses())
.append(", multicast: ")
.append(ifc.supportsMulticast())
.append(", state: ")
.append(ifc.isUp() ? "UP" : "DOWN");
}
}
return builder.toString();
}
static final class Context
{
ControlMode controlMode = ControlMode.NONE;
boolean hasExplicitEndpoint = false;
boolean hasExplicitControl = false;
boolean isMulticast = false;
boolean hasMulticastTtl = false;
boolean hasTagId = false;
boolean hasNoDistinguishingCharacteristic = false;
int socketRcvbufLength = 0;
int socketSndbufLength = 0;
int receiverWindowLength = 0;
int multicastTtl;
long tagId;
InetSocketAddress remoteData;
InetSocketAddress localData;
InetSocketAddress remoteControl;
InetSocketAddress localControl;
String uriStr;
String canonicalForm;
NetworkInterface localInterface;
ProtocolFamily protocolFamily;
ChannelUri channelUri;
int channelReceiveTimestampOffset;
int channelSendTimestampOffset;
Long groupTag = null;
Long nakDelayNs = null;
Context uriStr(final String uri)
{
uriStr = uri;
return this;
}
Context remoteDataAddress(final InetSocketAddress remoteData)
{
this.remoteData = remoteData;
return this;
}
Context localDataAddress(final InetSocketAddress localData)
{
this.localData = localData;
return this;
}
Context remoteControlAddress(final InetSocketAddress remoteControl)
{
this.remoteControl = remoteControl;
return this;
}
Context localControlAddress(final InetSocketAddress localControl)
{
this.localControl = localControl;
return this;
}
@SuppressWarnings("UnusedReturnValue")
Context canonicalForm(final String canonicalForm)
{
this.canonicalForm = canonicalForm;
return this;
}
Context localInterface(final NetworkInterface networkInterface)
{
this.localInterface = networkInterface;
return this;
}
Context protocolFamily(final ProtocolFamily protocolFamily)
{
this.protocolFamily = protocolFamily;
return this;
}
Context hasMulticastTtl(final boolean hasMulticastTtl)
{
this.hasMulticastTtl = hasMulticastTtl;
return this;
}
@SuppressWarnings("UnusedReturnValue")
Context multicastTtl(final int multicastTtl)
{
this.multicastTtl = multicastTtl;
return this;
}
@SuppressWarnings("UnusedReturnValue")
Context tagId(final long tagId)
{
this.tagId = tagId;
return this;
}
Context channelUri(final ChannelUri channelUri)
{
this.channelUri = channelUri;
return this;
}
Context controlMode(final ControlMode controlMode)
{
this.controlMode = controlMode;
return this;
}
Context hasExplicitEndpoint(final boolean hasExplicitEndpoint)
{
this.hasExplicitEndpoint = hasExplicitEndpoint;
return this;
}
Context hasExplicitControl(final boolean hasExplicitControl)
{
this.hasExplicitControl = hasExplicitControl;
return this;
}
Context isMulticast(final boolean isMulticast)
{
this.isMulticast = isMulticast;
return this;
}
Context hasTagId(final boolean hasTagId)
{
this.hasTagId = hasTagId;
return this;
}
Context hasNoDistinguishingCharacteristic(final boolean hasNoDistinguishingCharacteristic)
{
this.hasNoDistinguishingCharacteristic = hasNoDistinguishingCharacteristic;
return this;
}
Context socketRcvbufLength(final int socketRcvbufLength)
{
this.socketRcvbufLength = socketRcvbufLength;
return this;
}
Context socketSndbufLength(final int socketSndbufLength)
{
this.socketSndbufLength = socketSndbufLength;
return this;
}
Context receiverWindowLength(final int receiverWindowLength)
{
this.receiverWindowLength = receiverWindowLength;
return this;
}
@SuppressWarnings("UnusedReturnValue")
Context channelReceiveTimestampOffset(final int timestampOffset)
{
this.channelReceiveTimestampOffset = timestampOffset;
return this;
}
@SuppressWarnings("UnusedReturnValue")
Context channelSendTimestampOffset(final int timestampOffset)
{
this.channelSendTimestampOffset = timestampOffset;
return this;
}
Context nakDelayNs(final Long nakDelayNs)
{
this.nakDelayNs = nakDelayNs;
return this;
}
public void groupTag(final Long groupTag)
{
this.groupTag = groupTag;
}
}
}