Examples with DnsResponse io.netty.handler.codec.dns.DnsResponse used on opensource projects

Example 6 with DnsResponse

use of io.netty.handler.codec.dns.DnsResponse in project vert.x by eclipse.

the class DnsClientImpl method lookup.

@SuppressWarnings("unchecked")
private <T> void lookup(String name, Future<List<T>> result, DnsRecordType... types) {
    Objects.requireNonNull(name, "no null name accepted");
    bootstrap.connect(dnsServer).addListener(new RetryChannelFutureListener(result) {

        @Override
        public void onSuccess(ChannelFuture future) throws Exception {
            DatagramDnsQuery query = new DatagramDnsQuery(null, dnsServer, ThreadLocalRandom.current().nextInt());
            for (DnsRecordType type : types) {
                query.addRecord(DnsSection.QUESTION, new DefaultDnsQuestion(name, type, DnsRecord.CLASS_IN));
            }
            future.channel().writeAndFlush(query).addListener(new RetryChannelFutureListener(result) {

                @Override
                public void onSuccess(ChannelFuture future) throws Exception {
                    future.channel().pipeline().addLast(new SimpleChannelInboundHandler<DnsResponse>() {

                        @Override
                        protected void channelRead0(ChannelHandlerContext ctx, DnsResponse msg) throws Exception {
                            DnsResponseCode code = DnsResponseCode.valueOf(msg.code().intValue());
                            if (code == DnsResponseCode.NOERROR) {
                                int count = msg.count(DnsSection.ANSWER);
                                List<T> records = new ArrayList<>(count);
                                for (int idx = 0; idx < count; idx++) {
                                    DnsRecord a = msg.recordAt(DnsSection.ANSWER, idx);
                                    T record = RecordDecoder.decode(a);
                                    if (isRequestedType(a.type(), types)) {
                                        records.add(record);
                                    }
                                }
                                if (records.size() > 0 && (records.get(0) instanceof MxRecordImpl || records.get(0) instanceof SrvRecordImpl)) {
                                    Collections.sort((List) records);
                                }
                                setResult(result, records);
                            } else {
                                setFailure(result, new DnsException(code));
                            }
                            ctx.close();
                        }

                        private boolean isRequestedType(DnsRecordType dnsRecordType, DnsRecordType[] types) {
                            for (DnsRecordType t : types) {
                                if (t.equals(dnsRecordType)) {
                                    return true;
                                }
                            }
                            return false;
                        }

                        @Override
                        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                            setFailure(result, cause);
                            ctx.close();
                        }
                    });
                }
            });
        }
    });
}

Example 7 with DnsResponse

use of io.netty.handler.codec.dns.DnsResponse in project netty by netty.

the class DnsNameResolverContext method finishResolve.

private void finishResolve(Promise<T> promise) {
    if (!queriesInProgress.isEmpty()) {
        // If there are queries in progress, we should cancel it because we already finished the resolution.
        for (Iterator<Future<AddressedEnvelope<DnsResponse, InetSocketAddress>>> i = queriesInProgress.iterator(); i.hasNext(); ) {
            Future<AddressedEnvelope<DnsResponse, InetSocketAddress>> f = i.next();
            i.remove();
            if (!f.cancel(false)) {
                f.addListener(RELEASE_RESPONSE);
            }
        }
    }
    if (resolvedEntries != null) {
        // Found at least one resolved address.
        for (InternetProtocolFamily f : resolvedInternetProtocolFamilies) {
            if (finishResolve(f.addressType(), resolvedEntries, promise)) {
                return;
            }
        }
    }
    // No resolved address found.
    final int tries = maxAllowedQueries - allowedQueries;
    final StringBuilder buf = new StringBuilder(64);
    buf.append("failed to resolve '");
    if (pristineHostname != null) {
        buf.append(pristineHostname);
    } else {
        buf.append(hostname);
    }
    buf.append('\'');
    if (tries > 1) {
        if (tries < maxAllowedQueries) {
            buf.append(" after ").append(tries).append(" queries ");
        } else {
            buf.append(". Exceeded max queries per resolve ").append(maxAllowedQueries).append(' ');
        }
    }
    if (trace != null) {
        buf.append(':').append(trace);
    }
    final UnknownHostException cause = new UnknownHostException(buf.toString());
    resolveCache.cache(hostname, additionals, cause, parent.ch.eventLoop());
    promise.tryFailure(cause);
}