Add global incrementing tick number to scheduler

uranos-api/src/main/kotlin/space/uranos/Scheduler.kt

@@ -4,6 +4,13 @@ import kotlinx.coroutines.NonCancellable
 import kotlinx.coroutines.withContext
 
 interface Scheduler {
+    /**
+     * Only safe to access from the scheduler thread.
+     *
+     * Will overflow after about 5 years.
+     */
+    val currentTickNumber: Int
+
     /**
      * Executes [block] after [delay] ticks passed.
      *

uranos-server/src/main/kotlin/space/uranos/UranosScheduler.kt

@@ -21,6 +21,8 @@ class UranosScheduler : Scheduler {
 
     val logger = Logger("Scheduler", false)
 
+    override var currentTickNumber = Int.MIN_VALUE
+
     inner class Task<R : Any>(
         val fn: suspend () -> R,
         val interval: Long?,
@@ -29,8 +31,6 @@ class UranosScheduler : Scheduler {
         @Volatile
         var cancelled: Boolean = false
 
-        val creationStackTrace = Thread.currentThread().stackTrace
-
         override fun cancel() {
             tasks.remove(this)
             cancelled = true
@@ -68,6 +68,8 @@ class UranosScheduler : Scheduler {
                 val duration = System.currentTimeMillis() - startTime
                 if (duration > interval) logger.warn("Last tick took ${duration}ms, but should only take ${interval}ms")
             }
+
+            currentTickNumber += 1
         }, 0, interval, TimeUnit.MILLISECONDS)
     }
 

uranos-server/src/main/kotlin/space/uranos/UranosServer.kt

@@ -128,15 +128,12 @@ class UranosServer internal constructor() : Server() {
     }
 
     private fun startTicking() {
-        var index = 0
         scheduler.executeRepeating(1, 0) {
             runInServerThread {
                 players.forEach { it.container.tick() }
                 internalEntities.forEach { it.tick() }
-                sessions.forEach { it.tick(index) }
+                sessions.forEach { it.tick() }
             }
-
-            index++
         }
     }
 

uranos-server/src/main/kotlin/space/uranos/net/UranosSession.kt

@@ -2,6 +2,7 @@ package space.uranos.net
 
 import io.netty.buffer.ByteBuf
 import kotlinx.coroutines.*
+import space.uranos.Uranos
 import space.uranos.UranosServer
 import space.uranos.chat.ChatColor
 import space.uranos.chat.ChatComponent
@@ -169,8 +170,8 @@ class UranosSession(val channel: io.netty.channel.Channel, val server: UranosSer
 
     fun sendKeepAlivePacket() = send(OutgoingKeepAlivePacket(System.currentTimeMillis()))
 
-    suspend fun tick(index: Int) {
+    suspend fun tick() {
-        if (earlyPlayer != null && index % KEEP_ALIVE_PACKET_INTERVAL == 0L) sendKeepAlivePacket()
+        if (earlyPlayer != null && Uranos.scheduler.currentTickNumber % KEEP_ALIVE_PACKET_INTERVAL == 0L) sendKeepAlivePacket()
 
         packetsAdapter.tick()
     }