dht: print detailed request state in search log

src/dht.cpp

@@ -1540,10 +1540,7 @@ Dht::dumpSearch(const Search& sr, std::ostream& out) const
                     if (ack == n.acked.end() or not ack->second.first) {
                         out << ' ';
                     } else {
-                        if (ack->second.first->completed())
-                            out << 'a';
-                        else if (ack->second.first->pending())
-                            out << 'f';
+                        out << ack->second.first->getStateChar();
                     }
                 }
                 out << "] ";

src/request.h

@@ -57,6 +57,15 @@ struct Request {
     bool pending() const { return state_ == State::PENDING; }
     bool over() const { return not pending(); }
     State getState() const { return state_; }
+    char getStateChar() const {
+        switch (state_) {
+            case State::PENDING:   return 'f';
+            case State::CANCELLED: return 'c';
+            case State::EXPIRED:   return 'e';
+            case State::COMPLETED: return 'a';
+            default:               return '?';
+        }
+    }
 
     Request(State state = State::PENDING) : state_(state) {}
     Request(MessageType type, Tid tid,