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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright 2015 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.resolver;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.net.InetAddress;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
/**
* Default {@link HostsFileEntriesResolver} that resolves hosts file entries only once.
*/
public final class DefaultHostsFileEntriesResolver implements HostsFileEntriesResolver {
private static final InternalLogger logger =
InternalLoggerFactory.getInstance(DefaultHostsFileEntriesResolver.class);
private static final long DEFAULT_REFRESH_INTERVAL;
private final long refreshInterval;
private final AtomicLong lastRefresh = new AtomicLong(System.nanoTime());
private final HostsFileEntriesProvider.Parser hostsFileParser;
private volatile Map> inet4Entries;
private volatile Map> inet6Entries;
static {
DEFAULT_REFRESH_INTERVAL = SystemPropertyUtil.getLong(
"io.netty.hostsFileRefreshInterval", /*nanos*/0);
if (logger.isDebugEnabled()) {
logger.debug("-Dio.netty.hostsFileRefreshInterval: {}", DEFAULT_REFRESH_INTERVAL);
}
}
public DefaultHostsFileEntriesResolver() {
this(HostsFileEntriesProvider.parser(), DEFAULT_REFRESH_INTERVAL);
}
// for testing purpose only
DefaultHostsFileEntriesResolver(HostsFileEntriesProvider.Parser hostsFileParser, long refreshInterval) {
this.hostsFileParser = hostsFileParser;
this.refreshInterval = ObjectUtil.checkPositiveOrZero(refreshInterval, "refreshInterval");
HostsFileEntriesProvider entries = parseEntries(hostsFileParser);
inet4Entries = entries.ipv4Entries();
inet6Entries = entries.ipv6Entries();
}
@Override
public InetAddress address(String inetHost, ResolvedAddressTypes resolvedAddressTypes) {
return firstAddress(addresses(inetHost, resolvedAddressTypes));
}
/**
* Resolves all addresses of a hostname against the entries in a hosts file, depending on the specified
* {@link ResolvedAddressTypes}.
*
* @param inetHost the hostname to resolve
* @param resolvedAddressTypes the address types to resolve
* @return all matching addresses or {@code null} in case the hostname cannot be resolved
*/
public List addresses(String inetHost, ResolvedAddressTypes resolvedAddressTypes) {
String normalized = normalize(inetHost);
ensureHostsFileEntriesAreFresh();
switch (resolvedAddressTypes) {
case IPV4_ONLY:
return inet4Entries.get(normalized);
case IPV6_ONLY:
return inet6Entries.get(normalized);
case IPV4_PREFERRED:
List allInet4Addresses = inet4Entries.get(normalized);
return allInet4Addresses != null ? allAddresses(allInet4Addresses, inet6Entries.get(normalized)) :
inet6Entries.get(normalized);
case IPV6_PREFERRED:
List allInet6Addresses = inet6Entries.get(normalized);
return allInet6Addresses != null ? allAddresses(allInet6Addresses, inet4Entries.get(normalized)) :
inet4Entries.get(normalized);
default:
throw new IllegalArgumentException("Unknown ResolvedAddressTypes " + resolvedAddressTypes);
}
}
private void ensureHostsFileEntriesAreFresh() {
long interval = refreshInterval;
if (interval == 0) {
return;
}
long last = lastRefresh.get();
long currentTime = System.nanoTime();
if (currentTime - last > interval) {
if (lastRefresh.compareAndSet(last, currentTime)) {
HostsFileEntriesProvider entries = parseEntries(hostsFileParser);
inet4Entries = entries.ipv4Entries();
inet6Entries = entries.ipv6Entries();
}
}
}
// package-private for testing purposes
String normalize(String inetHost) {
return inetHost.toLowerCase(Locale.ENGLISH);
}
private static List allAddresses(List a, List b) {
List result = new ArrayList(a.size() + (b == null ? 0 : b.size()));
result.addAll(a);
if (b != null) {
result.addAll(b);
}
return result;
}
private static InetAddress firstAddress(List addresses) {
return addresses != null && !addresses.isEmpty() ? addresses.get(0) : null;
}
private static HostsFileEntriesProvider parseEntries(HostsFileEntriesProvider.Parser parser) {
if (PlatformDependent.isWindows()) {
// Ony windows there seems to be no standard for the encoding used for the hosts file, so let us
// try multiple until we either were able to parse it or there is none left and so we return an
// empty instance.
return parser.parseSilently(Charset.defaultCharset(), CharsetUtil.UTF_16, CharsetUtil.UTF_8);
}
return parser.parseSilently();
}
}
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