Java Code Examples for io.netty.resolver.AddressResolver#resolve()

@Test
void removedWhenNoCacheHit() throws Exception {
    try (TestDnsServer server = new TestDnsServer(ImmutableMap.of(
            new DefaultDnsQuestion("foo.com.", A),
            new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "1.1.1.1", 1))))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final DnsResolverGroupBuilder builder = builder(server);
        try (RefreshingAddressResolverGroup group = builder.build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);

            final long start = System.nanoTime();

            final Future<InetSocketAddress> foo = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().untilAsserted(() -> assertThat(foo.isSuccess()).isTrue());
            assertThat(foo.getNow().getAddress().getHostAddress()).isEqualTo("1.1.1.1");

            final ConcurrentMap<String, CompletableFuture<CacheEntry>> cache = group.cache();
            await().until(cache::isEmpty);

            assertThat(System.nanoTime() - start).isGreaterThanOrEqualTo(
                    (long) (TimeUnit.SECONDS.toNanos(1) * 0.9));
        }
    }
}
 

@Test
void cacheClearWhenClosed() throws Exception {
    try (TestDnsServer server = new TestDnsServer(ImmutableMap.of(
            new DefaultDnsQuestion("foo.com.", A),
            new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "1.1.1.1"))))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final RefreshingAddressResolverGroup group = builder(server).build(eventLoop);
        final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);
        final Future<InetSocketAddress> foo = resolver.resolve(
                InetSocketAddress.createUnresolved("foo.com", 36462));
        await().untilAsserted(() -> assertThat(foo.isSuccess()).isTrue());
        assertThat(foo.getNow().getAddress().getHostAddress()).isEqualTo("1.1.1.1");
        final ConcurrentMap<String, CompletableFuture<CacheEntry>> cache = group.cache();
        assertThat(cache.size()).isEqualTo(1);
        final CacheEntry cacheEntry = cache.get("foo.com").join();
        group.close();
        await().until(() -> {
            final ScheduledFuture<?> future = cacheEntry.refreshFuture;
            return future != null && future.isCancelled();
        });
        assertThat(cache).isEmpty();
    }
}
 

@Test
void returnDnsQuestionsWhenAllQueryTimeout() throws Exception {
    try (TestDnsServer server1 = new TestDnsServer(ImmutableMap.of(), new AlwaysTimeoutHandler());
         TestDnsServer server2 = new TestDnsServer(ImmutableMap.of(), new AlwaysTimeoutHandler())) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final DnsResolverGroupBuilder builder = builder(server1, server2)
                .queryTimeoutMillis(1000)
                .resolvedAddressTypes(ResolvedAddressTypes.IPV4_PREFERRED);
        try (RefreshingAddressResolverGroup group = builder.build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);
            final Future<InetSocketAddress> future = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().until(future::isDone);
            assertThat(future.cause()).isInstanceOf(DnsTimeoutException.class);
        }
    }
}
 

@Test
void returnPartialDnsQuestions() throws Exception {
    // Returns IPv6 correctly and make IPv4 timeout.
    try (TestDnsServer server = new TestDnsServer(
            ImmutableMap.of(
                    new DefaultDnsQuestion("foo.com.", AAAA),
                    new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "::1", 1))))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final DnsResolverGroupBuilder builder = builder(server)
                .queryTimeoutMillis(1000)
                .resolvedAddressTypes(ResolvedAddressTypes.IPV4_PREFERRED);
        try (RefreshingAddressResolverGroup group = builder.build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);
            final Future<InetSocketAddress> future = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().until(future::isDone);
            assertThat(future.getNow().getAddress().getHostAddress()).isEqualTo("0:0:0:0:0:0:0:1");
        }
    }
}
 

@Test
void preferredOrderIpv4() throws Exception {
    try (TestDnsServer server = new TestDnsServer(
            ImmutableMap.of(
                    new DefaultDnsQuestion("foo.com.", A),
                    new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "1.1.1.1")),
                    new DefaultDnsQuestion("foo.com.", AAAA),
                    new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "::1", 1))),
            new DelayHandler(A))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final DnsResolverGroupBuilder builder = builder(server)
                .resolvedAddressTypes(ResolvedAddressTypes.IPV4_PREFERRED);
        try (RefreshingAddressResolverGroup group = builder.build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);
            final Future<InetSocketAddress> future = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().until(future::isSuccess);
            assertThat(future.getNow().getAddress().getHostAddress()).isEqualTo("1.1.1.1");
        }
    }
}
 

@Test
void preferredOrderIpv6() throws Exception {
    try (TestDnsServer server = new TestDnsServer(
            ImmutableMap.of(
                    new DefaultDnsQuestion("foo.com.", A),
                    new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "1.1.1.1")),
                    new DefaultDnsQuestion("foo.com.", AAAA),
                    new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "::1", 1))),
            new DelayHandler(AAAA))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final DnsResolverGroupBuilder builder = builder(server)
                .resolvedAddressTypes(ResolvedAddressTypes.IPV6_PREFERRED);
        try (RefreshingAddressResolverGroup group = builder.build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);
            final Future<InetSocketAddress> future = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().until(future::isSuccess);
            assertThat(future.getNow().getAddress().getHostAddress()).isEqualTo("0:0:0:0:0:0:0:1");
        }
    }
}
 

@Test
void refreshing() throws Exception {
    try (TestDnsServer server = new TestDnsServer(ImmutableMap.of(
            new DefaultDnsQuestion("baz.com.", A),
            new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("baz.com.", "1.1.1.1", 1))))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        try (RefreshingAddressResolverGroup group = builder(server).build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);

            final long start = System.nanoTime();

            final Future<InetSocketAddress> foo = resolver.resolve(
                    InetSocketAddress.createUnresolved("baz.com", 36462));
            await().untilAsserted(() -> assertThat(foo.isSuccess()).isTrue());
            assertThat(foo.getNow().getAddress().getHostAddress()).isEqualTo("1.1.1.1");

            final ConcurrentMap<String, CompletableFuture<CacheEntry>> cache = group.cache();
            assertThat(cache.size()).isOne();
            assertThat(cache.get("baz.com").join().address()).isEqualTo(
                    InetAddress.getByAddress("baz.com", new byte[] { 1, 1, 1, 1 }));

            // Resolve one more to increase cache hits.
            resolver.resolve(InetSocketAddress.createUnresolved("baz.com", 36462));

            server.setResponses(ImmutableMap.of(
                    new DefaultDnsQuestion("baz.com.", A),
                    new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("baz.com.", "2.2.2.2"))));

            await().until(() -> {
                final CompletableFuture<CacheEntry> future = cache.get("baz.com");
                return future != null && future.join().address().equals(
                        InetAddress.getByAddress("baz.com", new byte[] { 2, 2, 2, 2 }));
            });

            assertThat(System.nanoTime() - start).isGreaterThanOrEqualTo(
                    (long) (TimeUnit.SECONDS.toNanos(1) * 0.9)); // ttl 2 seconds * buffer (90%)
        }
    }
}
 

@Test
void negativeTtl() {
    // TimeoutHandler times out only the first query.
    try (TestDnsServer server = new TestDnsServer(ImmutableMap.of(), new TimeoutHandler())) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final DnsResolverGroupBuilder builder = builder(server).negativeTtl(60).queryTimeoutMillis(1000);
        try (RefreshingAddressResolverGroup group = builder.build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);

            final Future<InetSocketAddress> future = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().until(future::isDone);

            final Throwable cause = future.cause();
            assertThat(cause).isInstanceOfAny(UnknownHostException.class,
                                              DnsTimeoutException.class);
            if (cause instanceof UnknownHostException) {
                assertThat(cause).hasCauseInstanceOf(DnsNameResolverTimeoutException.class);
            }

            // Because it's timed out, the result is not cached.
            final ConcurrentMap<String, CompletableFuture<CacheEntry>> cache = group.cache();
            assertThat(cache.size()).isZero();

            final Future<InetSocketAddress> future2 = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().until(future2::isDone);
            assertThat(future2.cause()).isInstanceOf(UnknownHostException.class)
                                       .hasNoCause();
            // Because it is NXDOMAIN, the result is cached.
            assertThat(cache.size()).isOne();
        }
    }
}
 

@Test
void resolve() throws Exception {
    try (TestDnsServer server = new TestDnsServer(ImmutableMap.of(
            new DefaultDnsQuestion("foo.com.", A),
            new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "1.1.1.1")),
            new DefaultDnsQuestion("bar.com.", A),
            new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("bar.com.", "1.2.3.4"))))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        try (RefreshingAddressResolverGroup group = builder(server).build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);
            final Future<InetSocketAddress> foo = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().untilAsserted(() -> assertThat(foo.isSuccess()).isTrue());
            InetSocketAddress addr = foo.getNow();
            assertThat(addr.getAddress().getHostAddress()).isEqualTo("1.1.1.1");
            assertThat(addr.getPort()).isEqualTo(36462);

            final ConcurrentMap<String, CompletableFuture<CacheEntry>> cache = group.cache();
            assertThat(cache.size()).isOne();

            final Future<InetSocketAddress> bar = resolver.resolve(
                    InetSocketAddress.createUnresolved("bar.com", 36462));
            await().untilAsserted(() -> assertThat(bar.isSuccess()).isTrue());
            addr = bar.getNow();
            assertThat(addr.getAddress().getHostAddress()).isEqualTo("1.2.3.4");
            assertThat(addr.getPort()).isEqualTo(36462);
            assertThat(cache.size()).isEqualTo(2);

            final Future<InetSocketAddress> foo1 = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 80));
            addr = foo1.getNow();
            assertThat(addr.getAddress().getHostAddress()).isEqualTo("1.1.1.1");
            assertThat(addr.getPort()).isEqualTo(80);
            assertThat(cache.size()).isEqualTo(2);

            final List<InetAddress> addresses =
                    cache.values()
                         .stream()
                         .map(future -> future.join().address())
                         .collect(toImmutableList());
            assertThat(addresses).containsExactlyInAnyOrder(
                    InetAddress.getByAddress("foo.com", new byte[] { 1, 1, 1, 1 }),
                    InetAddress.getByAddress("bar.com", new byte[] { 1, 2, 3, 4 }));
        }
    }
}
 

@Test
void removedWhenExceedingBackoffMaxAttempts() throws Exception {
    try (TestDnsServer server = new TestDnsServer(ImmutableMap.of(
            new DefaultDnsQuestion("foo.com.", A),
            new DefaultDnsResponse(0).addRecord(ANSWER, newAddressRecord("foo.com.", "1.1.1.1", 1))))
    ) {
        final EventLoop eventLoop = eventLoopExtension.get();
        final DnsResolverGroupBuilder builder = builder(server);
        builder.refreshBackoff(Backoff.ofDefault().withMaxAttempts(1));
        try (RefreshingAddressResolverGroup group = builder.build(eventLoop)) {
            final AddressResolver<InetSocketAddress> resolver = group.getResolver(eventLoop);

            final long start = System.nanoTime();

            final Future<InetSocketAddress> foo = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().untilAsserted(() -> assertThat(foo.isSuccess()).isTrue());
            assertThat(foo.getNow().getAddress().getHostAddress()).isEqualTo("1.1.1.1");

            server.setResponses(ImmutableMap.of());

            // Schedule resolve() every 500 millis to keep cache hits greater than 0.
            for (int i = 1; i <= 4; i++) {
                eventLoop.schedule(
                        () -> resolver.resolve(InetSocketAddress.createUnresolved("foo.com", 36462)),
                        500 * i, TimeUnit.MILLISECONDS);
            }

            final ConcurrentMap<String, CompletableFuture<CacheEntry>> cache = group.cache();
            await().until(cache::isEmpty);

            assertThat(System.nanoTime() - start).isGreaterThanOrEqualTo(
                    (long) (TimeUnit.SECONDS.toNanos(1) * 0.9)); // buffer (90%)

            final Future<InetSocketAddress> future = resolver.resolve(
                    InetSocketAddress.createUnresolved("foo.com", 36462));
            await().until(future::isDone);
            assertThat(future.cause()).isInstanceOf(UnknownHostException.class);
        }
    }
}