Examples with DnsException io.vertx.core.dns.DnsException used on opensource projects

Example 1 with DnsException

use of io.vertx.core.dns.DnsException in project vert.x by eclipse.

the class Examples method example16.

public void example16(Vertx vertx) {
    DnsClient client = vertx.createDnsClient(53, "10.0.0.1");
    client.lookup("nonexisting.vert.xio", ar -> {
        if (ar.succeeded()) {
            String record = ar.result();
            System.out.println(record);
        } else {
            Throwable cause = ar.cause();
            if (cause instanceof DnsException) {
                DnsException exception = (DnsException) cause;
                DnsResponseCode code = exception.code();
            } else {
                System.out.println("Failed to resolve entry" + ar.cause());
            }
        }
    });
}

Example 2 with DnsException

use of io.vertx.core.dns.DnsException in project vert.x by eclipse.

the class DNSTest method testLookupNonExisting.

@Test
public void testLookupNonExisting() throws Exception {
    DnsClient dns = prepareDns(FakeDNSServer.testLookupNonExisting());
    dns.lookup("gfegjegjf.sg1", ar -> {
        DnsException cause = (DnsException) ar.cause();
        assertEquals(DnsResponseCode.NXDOMAIN, cause.code());
        testComplete();
    });
    await();
    dnsServer.stop();
}

Example 3 with DnsException

use of io.vertx.core.dns.DnsException 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();
                        }
                    });
                }
            });
        }
    });
}