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feat(k8s): implement wildcard All Namespaces discovery #725

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feat(k8s): implement wildcard All Namespaces discovery #725

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2e67e53
feat(k8s): implement wildcard All Namespaces discovery
andrewazores Nov 26, 2024
908deda
refactor
andrewazores Nov 26, 2024
621538e
log
andrewazores Dec 4, 2024
41a4d4c
forced resync on all namespaces
andrewazores Dec 4, 2024
2169300
refactor
andrewazores Dec 4, 2024
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99 changes: 78 additions & 21 deletions src/main/java/io/cryostat/discovery/KubeApiDiscovery.java
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.management.remote.JMXServiceURL;

Expand Down Expand Up @@ -108,26 +109,38 @@ public class KubeApiDiscovery implements ResourceEventHandler<Endpoints> {
@Override
protected HashMap<String, SharedIndexInformer<Endpoints>> initialize()
throws ConcurrentException {
// TODO: add support for some wildcard indicating a single Informer for any
// namespace that Cryostat has permissions to. This will need some restructuring
// of how the namespaces within the discovery tree are mapped.
var result = new HashMap<String, SharedIndexInformer<Endpoints>>();
kubeConfig
.getWatchNamespaces()
.forEach(
ns -> {
result.put(
ns,
client.endpoints()
.inNamespace(ns)
.inform(
KubeApiDiscovery.this,
informerResyncPeriod.toMillis()));
logger.debugv(
"Started Endpoints SharedInformer for namespace"
+ " \"{0}\" with resync period {1}",
ns, informerResyncPeriod);
});
if (kubeConfig.watchAllNamespaces()) {
result.put(
KubeConfig.ALL_NAMESPACES,
client.endpoints()
.inAnyNamespace()
.inform(
KubeApiDiscovery.this,
informerResyncPeriod.toMillis()));
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Maybe, add a logger.debugv here?

 logger.debugv(
        "Started Endpoints SharedInformer for all namespace with resync period {0}",
        informerResyncPeriod);

logger.debugv(
"Started Endpoints Informer for All Namespaces with resync period"
+ " {0}",
informerResyncPeriod);
} else {
kubeConfig
.getWatchNamespaces()
.forEach(
ns -> {
result.put(
ns,
client.endpoints()
.inNamespace(ns)
.inform(
KubeApiDiscovery.this,
informerResyncPeriod
.toMillis()));
logger.debugv(
"Started Endpoints SharedInformer for namespace"
+ " \"{0}\" with resync period {1}",
ns, informerResyncPeriod);
});
}
return result;
}
};
Expand All @@ -144,11 +157,13 @@ void onStart(@Observes StartupEvent evt) {

logger.debugv("Starting {0} client", REALM);
safeGetInformers();
// TODO we should not need to force manual re-syncs this way - the Informer is already
// supposed to resync itself.
Comment on lines +160 to +161
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Just curious here: Is it now safe to remove this manual resync? If not, in the case of all namespaces, we should also list namespaces and do resync too?

resyncWorker.scheduleAtFixedRate(
() -> {
try {
logger.debug("Resyncing");
notify(NamespaceQueryEvent.from(kubeConfig.getWatchNamespaces()));
notify(NamespaceQueryEvent.from(getWatchNamespaces()));
} catch (Exception e) {
logger.warn(e);
}
Expand All @@ -158,6 +173,17 @@ void onStart(@Observes StartupEvent evt) {
TimeUnit.MILLISECONDS);
}

private List<String> getWatchNamespaces() {
if (kubeConfig.watchAllNamespaces()) {
return client.namespaces().list().getItems().stream()
.map(ns -> ns.getMetadata().getName())
.toList();
}
return kubeConfig.getWatchNamespaces().stream()
.filter(ns -> !KubeConfig.ALL_NAMESPACES.equals(ns))
.toList();
}

void onStop(@Observes ShutdownEvent evt) {
if (!(enabled() && available())) {
return;
Expand Down Expand Up @@ -226,6 +252,15 @@ List<TargetTuple> tuplesFromEndpoints(Endpoints endpoints) {
for (EndpointPort port : subset.getPorts()) {
for (EndpointAddress addr : subset.getAddresses()) {
var ref = addr.getTargetRef();
if (ref == null) {
logger.debugv(
"Endpoints object {0} in {1} with address {2} had a null"
+ " targetRef",
endpoints.getMetadata().getName(),
endpoints.getMetadata().getNamespace(),
addr.getIp());
continue;
}
tts.add(
new TargetTuple(
ref,
Expand Down Expand Up @@ -295,8 +330,24 @@ public void handleQueryEvent(NamespaceQueryEvent evt) {
persistedTargets.add(node.target);
}

Stream<Endpoints> endpoints;
if (kubeConfig.watchAllNamespaces()) {
endpoints =
safeGetInformers()
.get(KubeConfig.ALL_NAMESPACES)
.getStore()
.list()
.stream()
.filter(
ep ->
Objects.equals(
ep.getMetadata().getNamespace(),
namespace));
} else {
endpoints = safeGetInformers().get(namespace).getStore().list().stream();
}
Set<Target> observedTargets =
safeGetInformers().get(namespace).getStore().list().stream()
endpoints
.map((endpoint) -> getTargetTuplesFrom(endpoint))
.flatMap(List::stream)
.filter((tuple) -> Objects.nonNull(tuple.objRef))
Expand Down Expand Up @@ -533,6 +584,7 @@ private Pair<HasMetadata, DiscoveryNode> queryForNode(

@ApplicationScoped
static final class KubeConfig {
static final String ALL_NAMESPACES = "*";
private static final String OWN_NAMESPACE = ".";

@Inject Logger logger;
Expand All @@ -547,6 +599,11 @@ static final class KubeConfig {
@ConfigProperty(name = "cryostat.discovery.kubernetes.namespace-path")
String namespacePath;

boolean watchAllNamespaces() {
return watchNamespaces.orElse(List.of()).stream()
.anyMatch(ns -> ALL_NAMESPACES.equals(ns));
}

Collection<String> getWatchNamespaces() {
return watchNamespaces.orElse(List.of()).stream()
.map(
Expand Down
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