Examples of io.vertx.core.dns.DnsClient.lookup()

io.vertx.core.dns.DnsClient.lookup()
Try to lookup the A (ipv4) or AAAA (ipv6) record for the given name. The first found will be used. @param name The name to resolve @param handler the {@link io.vertx.core.Handler} to notify with the {@link io.vertx.core.AsyncResult}. The {@link io.vertx.core.AsyncResult} will getnotified with the resolved address if a record was found. If non was found it will get notifed with {@code null}. If an error accours it will get failed. @return itself for method-chaining.


  @Test
  public void testIllegalArguments() throws Exception {
    DnsClient dns = prepareDns(FakeDNSServer.testResolveAAAA("::1"));


    assertNullPointerException(() -> dns.lookup(null, ar -> {}));
    assertNullPointerException(() -> dns.lookup4(null, ar -> {}));
    assertNullPointerException(() -> dns.lookup6(null, ar -> {}));
    assertNullPointerException(() -> dns.resolveA(null, ar -> {}));
    assertNullPointerException(() -> dns.resolveAAAA(null, ar -> {}));
    assertNullPointerException(() -> dns.resolveCNAME(null, ar -> {}));

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  @Test
  public void testLookup() throws Exception {
    final String ip = "10.0.0.1";
    DnsClient dns = prepareDns(FakeDNSServer.testLookup(ip));


    dns.lookup("vertx.io", ar -> {
      String result = ar.result();
      assertNotNull(result);
      assertEquals(ip, result);
      testComplete();
    });

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  }


  @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();

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