Example usage for io.netty.handler.codec.dns DnsRecordType TXT

Introduction

In this page you can find the example usage for io.netty.handler.codec.dns DnsRecordType TXT.

Prototype

DnsRecordType TXT

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Document

Text record RFC 1035 Originally for arbitrary human-readable text in a DNS record.

Usage

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

License:Apache License

DnsTextEndpointGroup(EventLoop eventLoop, int minTtl, int maxTtl,
        DnsServerAddressStreamProvider serverAddressStreamProvider, Backoff backoff, String hostname,
        Function<byte[], Endpoint> mapping) {
    super(eventLoop, minTtl, maxTtl, serverAddressStreamProvider, backoff,
            ImmutableList.of(new DefaultDnsQuestion(hostname, DnsRecordType.TXT)), unused -> {
            });/*from w w  w .  j a  v  a2 s.co  m*/
    this.mapping = mapping;
    start();
}

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

License:Apache License

@Override
ImmutableSortedSet<Endpoint> onDnsRecords(List<DnsRecord> records, int ttl) throws Exception {
    final ImmutableSortedSet.Builder<Endpoint> builder = ImmutableSortedSet.naturalOrder();
    for (DnsRecord r : records) {
        if (!(r instanceof DnsRawRecord) || r.type() != DnsRecordType.TXT) {
            continue;
        }/*from  w  ww .j ava  2  s  .co  m*/

        final ByteBuf content = ((ByteBufHolder) r).content();
        if (!content.isReadable()) { // Missing length octet
            warnInvalidRecord(DnsRecordType.TXT, content);
            continue;
        }

        content.markReaderIndex();
        final int txtLen = content.readUnsignedByte();
        if (txtLen == 0) { // Empty content
            continue;
        }

        if (content.readableBytes() != txtLen) { // Mismatching number of octets
            content.resetReaderIndex();
            warnInvalidRecord(DnsRecordType.TXT, content);
            continue;
        }

        final byte[] txt = new byte[txtLen];
        content.readBytes(txt);

        final Endpoint endpoint;
        try {
            endpoint = mapping.apply(txt);
        } catch (Exception e) {
            content.resetReaderIndex();
            warnInvalidRecord(DnsRecordType.TXT, content);
            continue;
        }

        if (endpoint != null) {
            if (endpoint.isGroup()) {
                logger().warn("{} Ignoring group endpoint: {}", logPrefix(), endpoint);
            } else {
                builder.add(endpoint);
            }
        }
    }

    final ImmutableSortedSet<Endpoint> endpoints = builder.build();
    if (logger().isDebugEnabled()) {
        logger().debug("{} Resolved: {} (TTL: {})", logPrefix(),
                endpoints.stream().map(Object::toString).collect(Collectors.joining(", ")), ttl);
    }

    return endpoints;
}

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From source file:io.vertx.core.dns.impl.DnsClientImpl.java

License:Open Source License

@Override
public DnsClient resolveTXT(String name, Handler<AsyncResult<List<String>>> handler) {
    lookupList(name, new Handler<AsyncResult<List<String>>>() {
        @SuppressWarnings("unchecked")
        @Override/*from  w  ww .j a v  a  2  s. com*/
        public void handle(AsyncResult event) {
            if (event.failed()) {
                handler.handle(event);
            } else {
                List<String> txts = new ArrayList<>();
                List<List<String>> records = (List<List<String>>) event.result();
                for (List<String> txt : records) {
                    txts.addAll(txt);
                }
                handler.handle(Future.succeededFuture(txts));
            }
        }
    }, DnsRecordType.TXT);
    return this;
}

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