Let a module stream declare work-queue retention (issue 1177)

internal/inventory/busrecords.go

@@ -422,7 +422,8 @@ func streamsOf(m catalogue.Manifest) []broker.ModuleStream {
 			events = append(events, broker.WirePattern(e))
 		}
 		out = append(out, broker.ModuleStream{Module: m.Module, Name: s.BusName(), Events: events,
-			MaxAgeDays: s.Days(), MaxMiB: s.Cap(), Restricted: s.Grant != nil})
+			MaxAgeDays: s.Days(), MaxMiB: s.Cap(), Restricted: s.Grant != nil,
+			WorkQueue: s.Retention == catalogue.StreamRetentionWorkQueue, Duplicates: s.Duplicates})
 	}
 	return out
 }

internal/inventory/streams_test.go

@@ -43,3 +43,25 @@ func TestWhatAModuleHearsIsComposedOntoTheStreamsSubjects(t *testing.T) {
 		t.Fatalf("the provider's stream: %+v", got)
 	}
 }
+
+// 1177/AC1: a catalogue stream declaring retention work-queue is carried into the broker's ModuleStream as
+// WorkQueue, with its duplicate window.
+func TestAWorkQueueStreamIsCarriedIntoTheBrokersModuleStream(t *testing.T) {
+	sender := catalogue.Manifest{Module: "mesh-mail", Streams: []catalogue.StreamDeclaration{{Name: "mail-sends",
+		Events: []string{"mail.send.approved"}, MaxAgeDays: 1, MaxMiB: 64,
+		Retention: catalogue.StreamRetentionWorkQueue, MaxDeliveries: 5, Duplicates: 24}}}
+	got := streamsOf(sender)
+	if len(got) != 1 || got[0].Name != "MAIL_SENDS" || !got[0].WorkQueue || got[0].Duplicates != 24 {
+		t.Fatalf("the sender's stream: %+v", got)
+	}
+}
+
+// 1177/AC3: a catalogue stream with no retention is carried into the broker as not a work queue.
+func TestANonWorkQueueStreamIsCarriedAsNotAWorkQueue(t *testing.T) {
+	plain := catalogue.Manifest{Module: "feed", Streams: []catalogue.StreamDeclaration{{Name: "items",
+		Events: []string{"item.**"}}}}
+	got := streamsOf(plain)
+	if len(got) != 1 || got[0].WorkQueue || got[0].Duplicates != 0 {
+		t.Fatalf("the plain stream: %+v", got)
+	}
+}