io.questdb.network.AbstractIODispatcher Maven / Gradle / Ivy
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* Copyright (c) 2014-2019 Appsicle
* Copyright (c) 2019-2022 QuestDB
*
* 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
*
* http://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
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package io.questdb.network;
import io.questdb.log.Log;
import io.questdb.log.LogFactory;
import io.questdb.mp.*;
import io.questdb.std.*;
import io.questdb.std.datetime.millitime.MillisecondClock;
import java.util.concurrent.atomic.AtomicInteger;
public abstract class AbstractIODispatcher extends SynchronizedJob implements IODispatcher, EagerThreadSetup {
protected static final int DISCONNECT_SRC_IDLE = 1;
protected static final int DISCONNECT_SRC_PEER_DISCONNECT = 3;
protected static final int DISCONNECT_SRC_QUEUE = 0;
protected static final int DISCONNECT_SRC_SHUTDOWN = 2;
// OPM_XYZ = 3 is defined in the child classes
protected static final int OPM_FD = 1;
protected static final int OPM_OPERATION = 2;
protected static final int OPM_TIMESTAMP = 0;
private final static String[] DISCONNECT_SOURCES;
protected final Log LOG;
protected final int activeConnectionLimit;
protected final MillisecondClock clock;
protected final MPSequence disconnectPubSeq;
protected final RingQueue> disconnectQueue;
protected final SCSequence disconnectSubSeq;
protected final long idleConnectionTimeout;
protected final int initialBias;
protected final MPSequence interestPubSeq;
protected final RingQueue> interestQueue;
protected final SCSequence interestSubSeq;
protected final IOContextFactory ioContextFactory;
protected final SPSequence ioEventPubSeq;
protected final RingQueue> ioEventQueue;
protected final MCSequence ioEventSubSeq;
protected final NetworkFacade nf;
protected final ObjLongMatrix pending = new ObjLongMatrix<>(4);
private final IODispatcherConfiguration configuration;
private final AtomicInteger connectionCount = new AtomicInteger();
private final boolean peerNoLinger;
private final long queuedConnectionTimeoutMs;
private final int rcvBufSize;
private final int sndBufSize;
private final int testConnectionBufSize;
protected boolean closed = false;
protected int serverFd;
private long closeListenFdEpochMs;
private volatile boolean listening;
private int port;
protected final QueueConsumer> disconnectContextRef = this::disconnectContext;
private long testConnectionBuf;
public AbstractIODispatcher(
IODispatcherConfiguration configuration,
IOContextFactory ioContextFactory
) {
this.LOG = LogFactory.getLog(configuration.getDispatcherLogName());
this.configuration = configuration;
this.nf = configuration.getNetworkFacade();
this.testConnectionBufSize = configuration.getTestConnectionBufferSize();
this.testConnectionBuf = Unsafe.malloc(this.testConnectionBufSize, MemoryTag.NATIVE_DEFAULT);
this.interestQueue = new RingQueue<>(IOEvent::new, configuration.getInterestQueueCapacity());
this.interestPubSeq = new MPSequence(interestQueue.getCycle());
this.interestSubSeq = new SCSequence();
this.interestPubSeq.then(this.interestSubSeq).then(this.interestPubSeq);
this.ioEventQueue = new RingQueue<>(IOEvent::new, configuration.getIOQueueCapacity());
this.ioEventPubSeq = new SPSequence(configuration.getIOQueueCapacity());
this.ioEventSubSeq = new MCSequence(configuration.getIOQueueCapacity());
this.ioEventPubSeq.then(this.ioEventSubSeq).then(this.ioEventPubSeq);
this.disconnectQueue = new RingQueue<>(IOEvent::new, configuration.getIOQueueCapacity());
this.disconnectPubSeq = new MPSequence(disconnectQueue.getCycle());
this.disconnectSubSeq = new SCSequence();
this.disconnectPubSeq.then(this.disconnectSubSeq).then(this.disconnectPubSeq);
this.clock = configuration.getClock();
this.activeConnectionLimit = configuration.getLimit();
this.ioContextFactory = ioContextFactory;
this.initialBias = configuration.getInitialBias();
this.idleConnectionTimeout = configuration.getTimeout() > 0 ? configuration.getTimeout() : Long.MIN_VALUE;
this.queuedConnectionTimeoutMs = configuration.getQueueTimeout() > 0 ? configuration.getQueueTimeout() : 0;
this.sndBufSize = configuration.getSndBufSize();
this.rcvBufSize = configuration.getRcvBufSize();
this.peerNoLinger = configuration.getPeerNoLinger();
this.port = 0;
createListenFd();
listening = true;
}
@Override
public void close() {
closed = true;
processDisconnects(Long.MAX_VALUE);
for (int i = 0, n = pending.size(); i < n; i++) {
doDisconnect(pending.get(i), DISCONNECT_SRC_SHUTDOWN);
}
interestSubSeq.consumeAll(interestQueue, this.disconnectContextRef);
ioEventSubSeq.consumeAll(ioEventQueue, this.disconnectContextRef);
if (serverFd > 0) {
nf.close(serverFd, LOG);
serverFd = -1;
}
testConnectionBuf = Unsafe.free(testConnectionBuf, testConnectionBufSize, MemoryTag.NATIVE_DEFAULT);
}
@Override
public void disconnect(C context, int reason) {
LOG.info()
.$("scheduling disconnect [fd=").$(context.getFd())
.$(", reason=").$(reason)
.I$();
final long cursor = disconnectPubSeq.nextBully();
assert cursor > -1;
disconnectQueue.get(cursor).context = context;
disconnectPubSeq.done(cursor);
}
@Override
public int getConnectionCount() {
return connectionCount.get();
}
@Override
public int getPort() {
return port;
}
@Override
public boolean isListening() {
return listening;
}
@Override
public boolean processIOQueue(IORequestProcessor processor) {
long cursor = ioEventSubSeq.next();
while (cursor == -2) {
Os.pause();
cursor = ioEventSubSeq.next();
}
boolean useful = false;
if (cursor > -1) {
IOEvent event = ioEventQueue.get(cursor);
C connectionContext = event.context;
final int operation = event.operation;
ioEventSubSeq.done(cursor);
useful = processor.onRequest(operation, connectionContext);
}
return useful;
}
@Override
public void registerChannel(C context, int operation) {
long cursor = interestPubSeq.nextBully();
IOEvent evt = interestQueue.get(cursor);
evt.context = context;
evt.operation = operation;
LOG.debug().$("queuing [fd=").$(context.getFd()).$(", op=").$(operation).I$();
interestPubSeq.done(cursor);
}
@Override
public void setup() {
if (ioContextFactory instanceof EagerThreadSetup) {
((EagerThreadSetup) ioContextFactory).setup();
}
}
private void addPending(int fd, long timestamp) {
// append pending connection
// all rows below watermark will be registered with epoll (or similar)
int r = pending.addRow();
LOG.debug().$("pending [row=").$(r).$(", fd=").$(fd).$(']').$();
pending.set(r, OPM_TIMESTAMP, timestamp);
pending.set(r, OPM_FD, fd);
pending.set(r, OPM_OPERATION, -1);
pending.set(r, ioContextFactory.newInstance(fd, this));
pendingAdded(r);
}
private void createListenFd() throws NetworkError {
this.serverFd = nf.socketTcp(false);
final int backlog = configuration.getListenBacklog();
if (this.port == 0) {
// Note that `configuration.getBindPort()` might also be 0.
// In such case, we will bind to an ephemeral port.
this.port = configuration.getBindPort();
}
if (nf.bindTcp(this.serverFd, configuration.getBindIPv4Address(), this.port)) {
if (this.port == 0) {
// We resolve port 0 only once. In case we close and re-open the
// listening socket, we will reuse the previously resolved
// ephemeral port.
this.port = nf.resolvePort(this.serverFd);
}
nf.listen(this.serverFd, backlog);
} else {
throw NetworkError.instance(nf.errno()).couldNotBindSocket(
configuration.getDispatcherLogName(),
configuration.getBindIPv4Address(),
this.port);
}
LOG.advisory().$("listening on ").$ip(configuration.getBindIPv4Address()).$(':').$(configuration.getBindPort())
.$(" [fd=").$(serverFd)
.$(" backlog=").$(backlog)
.I$();
}
private void disconnectContext(IOEvent event) {
doDisconnect(event.context, DISCONNECT_SRC_QUEUE);
}
protected void accept(long timestamp) {
int tlConCount = this.connectionCount.get();
while (tlConCount < activeConnectionLimit) {
// this 'accept' is greedy, rather than to rely on epoll (or similar) to
// fire accept requests at us one at a time we will be actively accepting
// until nothing left.
int fd = nf.accept(serverFd);
if (fd < 0) {
if (nf.errno() != Net.EWOULDBLOCK) {
LOG.error().$("could not accept [ret=").$(fd).$(", errno=").$(nf.errno()).$(']').$();
}
break;
}
if (nf.configureNonBlocking(fd) < 0) {
LOG.error().$("could not configure non-blocking [fd=").$(fd).$(", errno=").$(nf.errno()).$(']').$();
nf.close(fd, LOG);
break;
}
if (nf.setTcpNoDelay(fd, true) < 0) {
// Randomly on OS X, if a client connects and the peer TCP socket has SO_LINGER set to false, then setting the TCP_NODELAY
// option fails!
LOG.info().$("could not turn off Nagle's algorithm [fd=").$(fd).$(", errno=").$(nf.errno()).$(']').$();
}
if (peerNoLinger) {
nf.configureNoLinger(fd);
}
if (sndBufSize > 0) {
nf.setSndBuf(fd, sndBufSize);
}
if (rcvBufSize > 0) {
nf.setRcvBuf(fd, rcvBufSize);
}
LOG.info().$("connected [ip=").$ip(nf.getPeerIP(fd)).$(", fd=").$(fd).$(']').$();
tlConCount = connectionCount.incrementAndGet();
addPending(fd, timestamp);
}
if (tlConCount >= activeConnectionLimit) {
if (connectionCount.get() >= activeConnectionLimit) {
unregisterListenerFd();
listening = false;
closeListenFdEpochMs = timestamp + queuedConnectionTimeoutMs;
LOG.info().$("max connection limit reached, unregistered listener [serverFd=").$(serverFd).I$();
}
}
}
protected void doDisconnect(C context, int src) {
if (context == null || context.invalid()) {
return;
}
final int fd = context.getFd();
LOG.info()
.$("disconnected [ip=").$ip(nf.getPeerIP(fd))
.$(", fd=").$(fd)
.$(", src=").$(DISCONNECT_SOURCES[src])
.I$();
nf.close(fd, LOG);
if (closed) {
Misc.free(context);
} else {
ioContextFactory.done(context);
}
if (connectionCount.getAndDecrement() >= activeConnectionLimit) {
if (connectionCount.get() < activeConnectionLimit) {
if (serverFd < 0) {
createListenFd();
}
registerListenerFd();
listening = true;
LOG.info().$("below maximum connection limit, registered listener [serverFd=").$(serverFd).I$();
}
}
}
protected abstract void pendingAdded(int index);
protected void processDisconnects(long epochMs) {
disconnectSubSeq.consumeAll(disconnectQueue, this.disconnectContextRef);
if (!listening && serverFd >= 0 && epochMs >= closeListenFdEpochMs) {
LOG.error().$("been unable to accept connections for ").$(queuedConnectionTimeoutMs).$("ms, closing listener [serverFd=").$(serverFd).I$();
nf.close(serverFd);
serverFd = -1;
}
}
protected void publishOperation(int operation, C context) {
long cursor = ioEventPubSeq.nextBully();
IOEvent evt = ioEventQueue.get(cursor);
evt.context = context;
evt.operation = operation;
ioEventPubSeq.done(cursor);
LOG.debug().$("fired [fd=").$(context.getFd()).$(", op=").$(operation).$(", pos=").$(cursor).$(']').$();
}
protected abstract void registerListenerFd();
protected boolean testConnection(int fd) {
return nf.testConnection(fd, testConnectionBuf, testConnectionBufSize);
}
protected abstract void unregisterListenerFd();
static {
DISCONNECT_SOURCES = new String[]{"queue", "idle", "shutdown", "peer"};
}
}
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