forked from netty/netty
/
KQueueDomainSocketChannel.java
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/
KQueueDomainSocketChannel.java
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/*
* Copyright 2016 The Netty Project
*
* The Netty Project licenses this file to you 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.netty.channel.kqueue;
import io.netty.channel.Channel;
import io.netty.channel.ChannelConfig;
import io.netty.channel.ChannelOutboundBuffer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.unix.DomainSocketAddress;
import io.netty.channel.unix.DomainSocketChannel;
import io.netty.channel.unix.FileDescriptor;
import io.netty.channel.unix.PeerCredentials;
import io.netty.util.internal.UnstableApi;
import java.io.IOException;
import java.net.SocketAddress;
import static io.netty.channel.kqueue.BsdSocket.newSocketDomain;
@UnstableApi
public final class KQueueDomainSocketChannel extends AbstractKQueueStreamChannel implements DomainSocketChannel {
private final KQueueDomainSocketChannelConfig config = new KQueueDomainSocketChannelConfig(this);
private volatile DomainSocketAddress local;
private volatile DomainSocketAddress remote;
public KQueueDomainSocketChannel() {
super(null, newSocketDomain(), false);
}
public KQueueDomainSocketChannel(int fd) {
this(null, new BsdSocket(fd));
}
KQueueDomainSocketChannel(Channel parent, BsdSocket fd) {
super(parent, fd, true);
}
@Override
protected AbstractKQueueUnsafe newUnsafe() {
return new KQueueDomainUnsafe();
}
@Override
protected DomainSocketAddress localAddress0() {
return local;
}
@Override
protected DomainSocketAddress remoteAddress0() {
return remote;
}
@Override
protected void doBind(SocketAddress localAddress) throws Exception {
socket.bind(localAddress);
local = (DomainSocketAddress) localAddress;
}
@Override
public KQueueDomainSocketChannelConfig config() {
return config;
}
@Override
protected boolean doConnect(SocketAddress remoteAddress, SocketAddress localAddress) throws Exception {
if (super.doConnect(remoteAddress, localAddress)) {
local = (DomainSocketAddress) localAddress;
remote = (DomainSocketAddress) remoteAddress;
return true;
}
return false;
}
@Override
public DomainSocketAddress remoteAddress() {
return (DomainSocketAddress) super.remoteAddress();
}
@Override
public DomainSocketAddress localAddress() {
return (DomainSocketAddress) super.localAddress();
}
@Override
protected int doWriteSingle(ChannelOutboundBuffer in) throws Exception {
Object msg = in.current();
if (msg instanceof FileDescriptor && socket.sendFd(((FileDescriptor) msg).intValue()) > 0) {
// File descriptor was written, so remove it.
in.remove();
return 1;
}
return super.doWriteSingle(in);
}
@Override
protected Object filterOutboundMessage(Object msg) {
if (msg instanceof FileDescriptor) {
return msg;
}
return super.filterOutboundMessage(msg);
}
/**
* Returns the unix credentials (uid, gid, pid) of the peer
* <a href=https://man7.org/linux/man-pages/man7/socket.7.html>SO_PEERCRED</a>
*/
@UnstableApi
public PeerCredentials peerCredentials() throws IOException {
return socket.getPeerCredentials();
}
private final class KQueueDomainUnsafe extends KQueueStreamUnsafe {
@Override
void readReady(KQueueRecvByteAllocatorHandle allocHandle) {
switch (config().getReadMode()) {
case BYTES:
super.readReady(allocHandle);
break;
case FILE_DESCRIPTORS:
readReadyFd();
break;
default:
throw new Error();
}
}
private void readReadyFd() {
if (socket.isInputShutdown()) {
super.clearReadFilter0();
return;
}
final ChannelConfig config = config();
final KQueueRecvByteAllocatorHandle allocHandle = recvBufAllocHandle();
final ChannelPipeline pipeline = pipeline();
allocHandle.reset(config);
readReadyBefore();
try {
readLoop: do {
// lastBytesRead represents the fd. We use lastBytesRead because it must be set so that the
// KQueueRecvByteAllocatorHandle knows if it should try to read again or not when autoRead is
// enabled.
int recvFd = socket.recvFd();
switch(recvFd) {
case 0:
allocHandle.lastBytesRead(0);
break readLoop;
case -1:
allocHandle.lastBytesRead(-1);
close(voidPromise());
return;
default:
allocHandle.lastBytesRead(1);
allocHandle.incMessagesRead(1);
readPending = false;
pipeline.fireChannelRead(new FileDescriptor(recvFd));
break;
}
} while (allocHandle.continueReading());
allocHandle.readComplete();
pipeline.fireChannelReadComplete();
} catch (Throwable t) {
allocHandle.readComplete();
pipeline.fireChannelReadComplete();
pipeline.fireExceptionCaught(t);
} finally {
readReadyFinally(config);
}
}
}
}