/*
* Copyright 2012-2017 the original author or authors.
*
* 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
* limitations under the License.
*/
package org.springframework.boot.web.embedded.undertow;
import java.lang.reflect.Field;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.List;
import io.undertow.Undertow;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xnio.channels.BoundChannel;
import org.springframework.boot.web.server.PortInUseException;
import org.springframework.boot.web.server.WebServer;
import org.springframework.boot.web.server.WebServerException;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;
/**
* {@link WebServer} that can be used to control a Undertow web server. Usually this class
* should be created using the {@link UndertowReactiveWebServerFactory} and not directly.
*
* @author Ivan Sopov
* @author Andy Wilkinson
* @author EddĂș MelĂ©ndez
* @author Christoph Dreis
* @author Brian Clozel
* @since 2.0.0
*/
public class UndertowWebServer implements WebServer {
private static final Log logger = LogFactory.getLog(UndertowServletWebServer.class);
private final Object monitor = new Object();
private final Undertow.Builder builder;
private final boolean autoStart;
private Undertow undertow;
private volatile boolean started = false;
/**
* Create a new {@link UndertowWebServer} instance.
* @param builder the builder
* @param autoStart if the server should be started
*/
public UndertowWebServer(Undertow.Builder builder, boolean autoStart) {
this.builder = builder;
this.autoStart = autoStart;
}
@Override
public void start() throws WebServerException {
synchronized (this.monitor) {
if (this.started) {
return;
}
try {
if (!this.autoStart) {
return;
}
if (this.undertow == null) {
this.undertow = this.builder.build();
}
this.undertow.start();
this.started = true;
UndertowWebServer.logger
.info("Undertow started on port(s) " + getPortsDescription());
}
catch (Exception ex) {
if (findBindException(ex) != null) {
List<UndertowWebServer.Port> failedPorts = getConfiguredPorts();
List<UndertowWebServer.Port> actualPorts = getActualPorts();
failedPorts.removeAll(actualPorts);
if (failedPorts.size() == 1) {
throw new PortInUseException(
failedPorts.iterator().next().getNumber());
}
}
throw new WebServerException("Unable to start embedded Undertow", ex);
}
}
}
private BindException findBindException(Exception ex) {
Throwable candidate = ex;
while (candidate != null) {
if (candidate instanceof BindException) {
return (BindException) candidate;
}
candidate = candidate.getCause();
}
return null;
}
private String getPortsDescription() {
List<UndertowWebServer.Port> ports = getActualPorts();
if (!ports.isEmpty()) {
return StringUtils.collectionToDelimitedString(ports, " ");
}
return "unknown";
}
private List<UndertowWebServer.Port> getActualPorts() {
List<UndertowWebServer.Port> ports = new ArrayList<>();
try {
if (!this.autoStart) {
ports.add(new UndertowWebServer.Port(-1, "unknown"));
}
else {
for (BoundChannel channel : extractChannels()) {
ports.add(getPortFromChannel(channel));
}
}
}
catch (Exception ex) {
// Continue
}
return ports;
}
@SuppressWarnings("unchecked")
private List<BoundChannel> extractChannels() {
Field channelsField = ReflectionUtils.findField(Undertow.class, "channels");
ReflectionUtils.makeAccessible(channelsField);
return (List<BoundChannel>) ReflectionUtils.getField(channelsField,
this.undertow);
}
private UndertowWebServer.Port getPortFromChannel(BoundChannel channel) {
SocketAddress socketAddress = channel.getLocalAddress();
if (socketAddress instanceof InetSocketAddress) {
String protocol = ReflectionUtils.findField(channel.getClass(), "ssl") != null
? "https" : "http";
return new UndertowWebServer.Port(
((InetSocketAddress) socketAddress).getPort(), protocol);
}
return null;
}
private List<UndertowWebServer.Port> getConfiguredPorts() {
List<UndertowWebServer.Port> ports = new ArrayList<>();
for (Object listener : extractListeners()) {
try {
ports.add(getPortFromListener(listener));
}
catch (Exception ex) {
// Continue
}
}
return ports;
}
@SuppressWarnings("unchecked")
private List<Object> extractListeners() {
Field listenersField = ReflectionUtils.findField(Undertow.class, "listeners");
ReflectionUtils.makeAccessible(listenersField);
return (List<Object>) ReflectionUtils.getField(listenersField, this.undertow);
}
private UndertowWebServer.Port getPortFromListener(Object listener) {
Field typeField = ReflectionUtils.findField(listener.getClass(), "type");
ReflectionUtils.makeAccessible(typeField);
String protocol = ReflectionUtils.getField(typeField, listener).toString();
Field portField = ReflectionUtils.findField(listener.getClass(), "port");
ReflectionUtils.makeAccessible(portField);
int port = (Integer) ReflectionUtils.getField(portField, listener);
return new UndertowWebServer.Port(port, protocol);
}
@Override
public void stop() throws WebServerException {
synchronized (this.monitor) {
if (!this.started) {
return;
}
this.started = false;
try {
this.undertow.stop();
}
catch (Exception ex) {
throw new WebServerException("Unable to stop undertow", ex);
}
}
}
@Override
public int getPort() {
List<UndertowWebServer.Port> ports = getActualPorts();
if (ports.isEmpty()) {
return 0;
}
return ports.get(0).getNumber();
}
/**
* An active Undertow port.
*/
private final static class Port {
private final int number;
private final String protocol;
private Port(int number, String protocol) {
this.number = number;
this.protocol = protocol;
}
public int getNumber() {
return this.number;
}
@Override
public String toString() {
return this.number + " (" + this.protocol + ")";
}
@Override
public int hashCode() {
return this.number;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
UndertowWebServer.Port other = (UndertowWebServer.Port) obj;
if (this.number != other.number) {
return false;
}
return true;
}
}
}