replay: fix concurrency issues (#29797)

fix concurrency issues

tools/replay/replay.cc

@@ -151,9 +151,10 @@ void Replay::buildTimeline() {
     [(int)cereal::ControlsState::AlertStatus::CRITICAL] = TimelineType::AlertCritical,
   };
 
-  for (auto it = segments_.cbegin(); it != segments_.cend() && !exit_; ++it) {
+  const auto &route_segments = route_->segments();
+  for (auto it = route_segments.cbegin(); it != route_segments.cend() && !exit_; ++it) {
     LogReader log;
-    if (!log.load(route_->at(it->first).qlog.toStdString(), &exit_,
+    if (!log.load(it->second.qlog.toStdString(), &exit_,
                   {cereal::Event::Which::CONTROLS_STATE, cereal::Event::Which::USER_FLAG},
                   !hasFlag(REPLAY_FLAG_NO_FILE_CACHE), 0, 3)) continue;
 
@@ -227,7 +228,10 @@ void Replay::segmentLoadFinished(bool success) {
   if (!success) {
     Segment *seg = qobject_cast<Segment *>(sender());
     rWarning("failed to load segment %d, removing it from current replay list", seg->seg_num);
+    updateEvents([&]() {
       segments_.erase(seg->seg_num);
+      return true;
+    });
   }
   queueSegment();
 }
@@ -456,7 +460,7 @@ void Replay::stream() {
     }
 
     if (eit == events_->end() && !hasFlag(REPLAY_FLAG_NO_LOOP)) {
-      int last_segment = segments_.rbegin()->first;
+      int last_segment = segments_.empty() ? 0 : segments_.rbegin()->first;
       if (current_segment_ >= last_segment && isSegmentMerged(last_segment)) {
         rInfo("reaches the end of route, restart from beginning");
         QMetaObject::invokeMethod(this, std::bind(&Replay::seekTo, this, 0, false), Qt::QueuedConnection);