cancel request when receiving token error

include/opendht/network_engine.h

@@ -217,6 +217,13 @@ class NetworkEngine final {
                and now - last_try <= Node::MAX_RESPONSE_TIME;
         }
 
+        void cancel() {
+            if (not completed) {
+                cancelled = true;
+                clear();
+            }
+        }
+
         Request() {}
 
     private:
@@ -227,11 +234,17 @@ class NetworkEngine final {
                 std::function<void(std::shared_ptr<Request> req_status, bool)> on_expired, bool persistent = false) :
             node(node), on_done(on_done), on_expired(on_expired), tid(tid), msg(std::move(msg)), persistent(persistent) { }
 
+        void clear() {
+            on_done = {};
+            on_expired = {};
+            msg.clear();
+        }
+
         std::function<void(std::shared_ptr<Request> req_status, ParsedMessage&&)> on_done {};
         std::function<void(std::shared_ptr<Request> req_status, bool)> on_expired {};
 
         const uint16_t tid {0};                   /* the request id. */
-        const Blob msg {};                              /* the serialized message. */
+        Blob msg {};                              /* the serialized message. */
         const bool persistent {false};            /* the request is not erased upon completion. */
     };
 
@@ -241,9 +254,7 @@ class NetworkEngine final {
      */
     void cancelRequest(std::shared_ptr<Request>& req) {
         if (req) {
-            req->cancelled = true;
-            req->on_done = {};
-            req->on_expired = {};
+            req->cancel();
             requests.erase(req->tid);
         }
     }
@@ -356,10 +367,8 @@ class NetworkEngine final {
     };
 
     void clear() {
-        for (auto& req : requests) {
-            req.second->on_expired = {};
-            req.second->on_done = {};
-        }
+        for (auto& req : requests)
+            req.second->cancel();
         requests.clear();
     }
 

src/dht.cpp

@@ -2524,17 +2524,15 @@ Dht::pingNode(const sockaddr *sa, socklen_t salen)
 }
 
 void
-Dht::onError(std::shared_ptr<NetworkEngine::Request> status, DhtProtocolException e) {
+Dht::onError(std::shared_ptr<NetworkEngine::Request> req, DhtProtocolException e) {
     if (e.getCode() == DhtProtocolException::UNAUTHORIZED) {
-        //TODO
-        //auto esr = searches.find(status);
-        //if (esr == searches.end()) return;
+        network_engine.cancelRequest(req);
         unsigned cleared = 0;
-        for (auto& srp : status->node->ss.ss_family == AF_INET ? searches4 : searches6) {
+        for (auto& srp : req->node->ss.ss_family == AF_INET ? searches4 : searches6) {
             auto& sr = srp.second;
             for (auto& n : sr->nodes) {
-                if (n.node != status->node) continue;
-                n.getStatus = {};
+                if (n.node != req->node) continue;
+                network_engine.cancelRequest(n.getStatus);
                 n.last_get_reply = time_point::min();
                 cleared++;
                 if (searchSendGetValues(sr))
@@ -2543,7 +2541,7 @@ Dht::onError(std::shared_ptr<NetworkEngine::Request> status, DhtProtocolExceptio
             }
         }
         DHT_LOG.WARN("[node %s %s] token flush (%d searches affected)",
-                status->node->id.toString().c_str(), print_addr((sockaddr*)&status->node->ss, status->node->sslen).c_str(), cleared);
+                req->node->id.toString().c_str(), print_addr((sockaddr*)&req->node->ss, req->node->sslen).c_str(), cleared);
     }
 }
 

src/network_engine.cpp

@@ -137,6 +137,8 @@ NetworkEngine::processMessage(const uint8_t *buf, size_t buflen, const sockaddr
         if (reqp == requests.end())
             throw DhtProtocolException {DhtProtocolException::UNKNOWN_TID, "Can't find transaction", msg.id};
         auto req = reqp->second;
+        if (req->cancelled)
+            return;
 
         auto node = onNewNode(msg.id, from, fromlen, 2);
         onReportedAddr(msg.id, (sockaddr*)&msg.addr.first, msg.addr.second);
@@ -158,15 +160,14 @@ NetworkEngine::processMessage(const uint8_t *buf, size_t buflen, const sockaddr
             break;
         }
         case MessageType::Reply:
-             if (not reqp->second->persistent or reqp->second->cancelled)
+            // erase before calling callback to make sure iterator is still valid
+            if (not req->persistent)
                 requests.erase(reqp);
             req->reply_time = scheduler.time();
             req->completed = true;
             req->on_done(req, std::move(msg));
-            if (not req->persistent) {
-                req->on_done = {};
-                req->on_expired = {};
-            }
+            if (not req->persistent)
+                req->clear();
             break;
         default:
             break;