Example usage for io.netty.resolver.dns DnsServerAddressStream next

Introduction

In this page you can find the example usage for io.netty.resolver.dns DnsServerAddressStream next.

Prototype

InetSocketAddress next();

Source Link

Document

Retrieves the next DNS server address from the stream.

Usage

From source file:com.linecorp.armeria.client.endpoint.dns.DnsEndpointGroupBuilderTest.java

License:Apache License

@Test
public void serverAddresses() {
    // Should be set by default.
    assertThat(builder().serverAddressStreamProvider()).isNotNull();

    // Should use the sequential stream when set by a user.
    final DnsServerAddressStreamProvider provider = builder()
            .serverAddresses(new InetSocketAddress("1.1.1.1", 53), new InetSocketAddress("1.0.0.1", 53))
            .serverAddressStreamProvider();

    final DnsServerAddressStream stream = provider.nameServerAddressStream("foo.com");
    assertThat(stream.size()).isEqualTo(2);
    assertThat(stream.next()).isEqualTo(new InetSocketAddress("1.1.1.1", 53));
    assertThat(stream.next()).isEqualTo(new InetSocketAddress("1.0.0.1", 53));
    assertThat(stream.next()).isEqualTo(new InetSocketAddress("1.1.1.1", 53));
    assertThat(stream.next()).isEqualTo(new InetSocketAddress("1.0.0.1", 53));
}

---

From source file:io.vertx.core.impl.resolver.DnsResolverProvider.java

License:Open Source License

public DnsResolverProvider(VertxImpl vertx, AddressResolverOptions options) {
    List<String> dnsServers = options.getServers();
    List<InetSocketAddress> serverList = new ArrayList<>();
    if (dnsServers != null && dnsServers.size() > 0) {
        for (String dnsServer : dnsServers) {
            int sep = dnsServer.indexOf(':');
            String ipAddress;/* w w w.  jav  a  2s. c o m*/
            int port;
            if (sep != -1) {
                ipAddress = dnsServer.substring(0, sep);
                port = Integer.parseInt(dnsServer.substring(sep + 1));
            } else {
                ipAddress = dnsServer;
                port = 53;
            }
            try {
                serverList.add(new InetSocketAddress(
                        InetAddress.getByAddress(NetUtil.createByteArrayFromIpAddressString(ipAddress)), port));
            } catch (UnknownHostException e) {
                throw new VertxException(e);
            }
        }
    } else {
        DnsServerAddressStream stream = DnsServerAddresses.defaultAddresses().stream();
        Set<InetSocketAddress> all = new HashSet<>();
        while (true) {
            InetSocketAddress address = stream.next();
            if (all.contains(address)) {
                break;
            }
            serverList.add(address);
            all.add(address);
        }
    }
    DnsServerAddresses nameServerAddresses = options.isRotateServers()
            ? DnsServerAddresses.rotational(serverList)
            : DnsServerAddresses.sequential(serverList);

    Map<String, InetAddress> entries;
    if (options.getHostsPath() != null) {
        File file = vertx.resolveFile(options.getHostsPath()).getAbsoluteFile();
        try {
            if (!file.exists() || !file.isFile()) {
                throw new IOException();
            }
            entries = HostsFileParser.parse(file);
        } catch (IOException e) {
            throw new VertxException("Cannot read hosts file " + file.getAbsolutePath());
        }
    } else if (options.getHostsValue() != null) {
        try {
            entries = HostsFileParser.parse(new StringReader(options.getHostsValue().toString()));
        } catch (IOException e) {
            throw new VertxException("Cannot read hosts config ", e);
        }
    } else {
        entries = HostsFileParser.parseSilently();
    }

    this.vertx = vertx;
    this.resolverGroup = new AddressResolverGroup<InetSocketAddress>() {

        @Override
        protected io.netty.resolver.AddressResolver<InetSocketAddress> newResolver(EventExecutor executor)
                throws Exception {

            DnsAddressResolverGroup group = new DnsAddressResolverGroup(NioDatagramChannel.class,
                    nameServerAddresses) {
                @Override
                protected NameResolver<InetAddress> newNameResolver(EventLoop eventLoop,
                        ChannelFactory<? extends DatagramChannel> channelFactory,
                        DnsServerAddresses nameServerAddresses) throws Exception {
                    DnsNameResolverBuilder builder = new DnsNameResolverBuilder((EventLoop) executor);
                    builder.hostsFileEntriesResolver(inetHost -> {
                        InetAddress addr = entries.get(inetHost);
                        if (addr == null) {
                            addr = entries.get(inetHost.toLowerCase(Locale.ENGLISH));
                        }
                        return addr;
                    });
                    builder.channelType(NioDatagramChannel.class);
                    builder.nameServerAddresses(nameServerAddresses);
                    builder.optResourceEnabled(options.isOptResourceEnabled());
                    builder.ttl(options.getCacheMinTimeToLive(), options.getCacheMaxTimeToLive());
                    builder.negativeTtl(options.getCacheNegativeTimeToLive());
                    builder.queryTimeoutMillis(options.getQueryTimeout());
                    builder.maxQueriesPerResolve(options.getMaxQueries());
                    builder.recursionDesired(options.getRdFlag());
                    if (options.getSearchDomains() != null) {
                        builder.searchDomains(options.getSearchDomains());
                        int ndots = options.getNdots();
                        if (ndots == -1) {
                            ndots = AddressResolver.DEFAULT_NDOTS_RESOLV_OPTION;
                        }
                        builder.ndots(ndots);
                    }
                    return builder.build();
                }
            };

            io.netty.resolver.AddressResolver<InetSocketAddress> resolver = group.getResolver(executor);
            resolvers.add(new ResolverRegistration(resolver, (EventLoop) executor));

            return resolver;
        }
    };
}

---