Update version to 0.2.5, add train trip statistics option feature, and improve train state handling and null safety

train-stats.lua

@@ -167,6 +167,7 @@ function onTrainStateChange(event)
 
     if event.train.state == defines.train_state.wait_station then
 
+        if not train.station then return end
         if train.station.unit_number == stat.lastStationUnitNumber then return end
 
         stat.lastStationUnitNumber = stat.currentStationUnitNumber
@@ -198,12 +199,28 @@ function onTrainStateChange(event)
     end
     --log("inEvent")
 end
+--Checks if trip is still valid by checking of st
+function isTripValid(trip,tripID,trainID)
+    if trip.startStation == nil
+    or trip.endStation==nil 
+    or trip.startStation.valid == false 
+    or trip.endStation.valid == false then
+        --One station is nil so we delete this trip 
+        log("Deleting trip"..tripID)
+        storage.trainStats[trainID].trips[tripID] = nil
+        return false
+    end
+    --Stations are valid, so we true
+    return true
+end
 
 function GetTrainTripStats()
     local tripParts = {}
+    local tripCount = 0
     tripParts[#tripParts+1] = "---train-trips---\n"
     for trainID,stats in pairs(storage.trainStats) do
-        for _,trip in pairs(stats.trips or {}) do
+        for tripIndex,trip in pairs(stats.trips or {}) do
+            if isTripValid(trip,tripIndex,trainID) then
             tripParts[#tripParts+1] = 
                 ("%d:%s:%s:%s:%d"):format(
                     trainID,
@@ -211,9 +228,17 @@ function GetTrainTripStats()
                     trip.startStation.backer_name,
                     trip.endStation.backer_name,
                     trip.timeTaken)
+                    tripCount = tripCount + 1
+            end
+        end
+        if #tripParts > 400 then
+            log("Sending at "..tripCount.." trips")
+            helpers.send_udp(udpAddress,table.concat(tripParts,"\n"),serverIndex)
+            tripParts = {}
         end
     end
-    return table.concat(tripParts,"\n")
+    log("Counted "..tripCount.." trips")
+    --return table.concat(tripParts,"\n")
 end
 
 function GetTrainStatistics()
@@ -255,10 +280,10 @@ function SendTrainStats()
     returnParts[#returnParts+1] = GetTrainTotalKills()
     returnParts[#returnParts+1] = GetTrainStates()
     returnParts[#returnParts+1] = GetTrainStatistics()
-    helpers.send_udp(udpAddress,table.concat(returnParts,"\n"),serverIndex)
-    returnParts = {}
     returnParts[#returnParts+1] = GetTrainsInDepot()
-    returnParts[#returnParts+1] = GetTrainTripStats()
+    if options.enableTrainTrips then
+        GetTrainTripStats()
+    end
     log("Sending Train statistics")
     helpers.send_udp(udpAddress,table.concat(returnParts,"\n"),serverIndex)
     end