add rdnsquerier to process-agent subcommand

cmd/process-agent/subcommands/check/check.go

@@ -39,6 +39,7 @@ import (
 	processComponent "github.com/DataDog/datadog-agent/comp/process"
 	"github.com/DataDog/datadog-agent/comp/process/hostinfo"
 	"github.com/DataDog/datadog-agent/comp/process/types"
+	rdnsquerierfx "github.com/DataDog/datadog-agent/comp/rdnsquerier/fx"
 	"github.com/DataDog/datadog-agent/pkg/process/checks"
 	"github.com/DataDog/datadog-agent/pkg/util/fxutil"
 	"github.com/DataDog/datadog-agent/pkg/version"
@@ -124,6 +125,11 @@ func MakeCommand(globalParamsGetter func() *command.GlobalParams, name string, a
 				// Provide eventplatformimpl module
 				eventplatformreceiverimpl.Module(),
 				eventplatformimpl.Module(eventplatformimpl.NewDefaultParams()),
+
+				// Provide rdnsquerier module
+				rdnsquerierfx.Module(),
+
+				// Provide npcollector module
 				npcollectorimpl.Module(),
 				// Provide the corresponding workloadmeta Params to configure the catalog
 				wmcatalog.GetCatalog(),

comp/networkpath/npcollector/npcollectorimpl/npcollectorcomp.go

@@ -45,6 +45,13 @@ func Module() fxutil.Module {
 func newNpCollector(deps dependencies) provides {
 	var collector *npCollectorImpl
 
+	// Note that multiple components can share the same rdnsQuerier instance.  If any of them have
+	// reverse DNS enrichment enabled then the deps.RDNSQuerier component passed here will be an
+	// active instance.  However, we also need to check here whether the netflow component has
+	// reverse DNS enrichment enabled to decide whether to use the passed instance or to override
+	// it with a noop implementation.
+	rdnsQuerier := deps.RDNSQuerier
+
 	configs := newConfig(deps.AgentConfig)
 	if configs.networkPathCollectorEnabled() {
 		deps.Logger.Debugf("Network Path Collector enabled")
@@ -53,7 +60,7 @@ func newNpCollector(deps dependencies) provides {
 			deps.Logger.Errorf("Error getting EpForwarder")
 			collector = newNoopNpCollectorImpl()
 		} else {
-			collector = newNpCollectorImpl(epForwarder, configs, deps.Logger, deps.Telemetry, deps.RDNSQuerier)
+			collector = newNpCollectorImpl(epForwarder, configs, deps.Logger, deps.Telemetry, rdnsQuerier)
 			deps.Lc.Append(fx.Hook{
 				// No need for OnStart hook since NpCollector.Init() will be called by clients when needed.
 				OnStart: func(context.Context) error {