linter: address deadcode, implement incremental lint testing

consensus/common.go

@@ -0,0 +1,18 @@
+package consensus
+
+import (
+	"github.com/tendermint/tendermint/types"
+)
+
+// XXX: WARNING: this function can halt the consensus as firing events is synchronous.
+// Make sure to read off the channels, and in the case of subscribeToEventRespond, to write back on it
+
+// NOTE: if chanCap=0, this blocks on the event being consumed
+func subscribeToEvent(evsw types.EventSwitch, receiver, eventID string, chanCap int) chan interface{} {
+	// listen for event
+	ch := make(chan interface{}, chanCap)
+	types.AddListenerForEvent(evsw, receiver, eventID, func(data types.TMEventData) {
+		ch <- data
+	})
+	return ch
+}