testFollowCNAMELoop() — netty Function Reference

Architecture documentation for the testFollowCNAMELoop() function in DnsNameResolverTest.java from the netty codebase.

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Buffer→ Telemetry→ testFollowCNAMELoop() — netty Function Reference

Dependency Diagram

graph TD
  8f414e6e_7129_bc10_6c07_9134022cc134["testFollowCNAMELoop()"]
  b6215f36_0afe_a284_a3fd_3999e90a8e97["DnsNameResolverTest"]
  8f414e6e_7129_bc10_6c07_9134022cc134 -->|defined in| b6215f36_0afe_a284_a3fd_3999e90a8e97
  style 8f414e6e_7129_bc10_6c07_9134022cc134 fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java lines 2641–2691

    @ParameterizedTest
    @EnumSource(DnsNameResolverChannelStrategy.class)
    public void testFollowCNAMELoop(DnsNameResolverChannelStrategy strategy) throws IOException {
        TestDnsServer dnsServer2 = new TestDnsServer(new RecordStore() {

            @Override
            public Set<ResourceRecord> getRecords(QuestionRecord question) {
                Set<ResourceRecord> records = new LinkedHashSet<ResourceRecord>(4);

                records.add(new TestDnsServer.TestResourceRecord("x." + question.getDomainName(),
                        RecordType.A, Collections.<String, Object>singletonMap(
                                DnsAttribute.IP_ADDRESS.toLowerCase(), "10.0.0.99")));
                records.add(new TestDnsServer.TestResourceRecord(
                        "cname2.netty.io", RecordType.CNAME,
                        Collections.<String, Object>singletonMap(
                                DnsAttribute.DOMAIN_NAME.toLowerCase(), "cname.netty.io")));
                records.add(new TestDnsServer.TestResourceRecord(
                        "cname.netty.io", RecordType.CNAME,
                        Collections.<String, Object>singletonMap(
                                DnsAttribute.DOMAIN_NAME.toLowerCase(), "cname2.netty.io")));
                records.add(new TestDnsServer.TestResourceRecord(
                        question.getDomainName(), RecordType.CNAME,
                        Collections.<String, Object>singletonMap(
                                DnsAttribute.DOMAIN_NAME.toLowerCase(), "cname.netty.io")));
                return records;
            }
        });
        dnsServer2.start();
        DnsNameResolver resolver = null;
        try {
            DnsNameResolverBuilder builder = newResolver(strategy)
                    .recursionDesired(false)
                    .resolvedAddressTypes(ResolvedAddressTypes.IPV4_ONLY)
                    .maxQueriesPerResolve(16)
                    .nameServerProvider(new SingletonDnsServerAddressStreamProvider(dnsServer2.localAddress()));

            resolver = builder.build();
            final DnsNameResolver finalResolver = resolver;
            assertThrows(UnknownHostException.class, new Executable() {
                @Override
                public void execute() throws Throwable {
                    finalResolver.resolveAll("somehost.netty.io").syncUninterruptibly().getNow();
                }
            });
        } finally {
            dnsServer2.stop();
            if (resolver != null) {
                resolver.close();
            }
        }
    }