Hi gRPC team,
Firstly, thanks for listen to me. I have a question that in my current
project, I already have a daemon service to check Name server (DNS) and
when have a changed, I want it call custom NameResolver to update gRPC
client channel. I have a solution like it:
public class ExampleNameResolver extends NameResolver {
private Listener2 listener;
private final String serviceName;
private final AtomicReference<List<InetSocketAddress>> currentAddresses
= new AtomicReference<>(Collections.emptyList());
public ExampleNameResolver(URI targetUri) {
this.serviceName = targetUri.getPath().substring(1);
}
@Override
public String getServiceAuthority() {
return "example-authority";
}
@Override
public void start(Listener2 listener) {
this.listener = listener;
if (!currentAddresses.get().isEmpty()) {
updateResolution();
}
}
@Override
public void refresh() {
}
@Override
public void shutdown() {
}
public void updateAddresses(List<InetSocketAddress> newAddresses) {
currentAddresses.set(newAddresses);
updateResolution();
}
private void updateResolution() {
if (listener == null) {
return;
}
List<EquivalentAddressGroup> groups =
currentAddresses.get().stream()
.map(EquivalentAddressGroup::new)
.collect(Collectors.toList());
ResolutionResult result = ResolutionResult.newBuilder()
.setAddresses(groups)
.build();
listener.onResult(result);
}
}
Do you think about this solution? Have any risk? Do you have any suggestion?
(I mean about the logical, NameResolver will be auto call to get newest
Name server (proactive), but I want it only update when I want (passive)
Thank and best regards team.
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