RCON commands feature (#1391)

Co-authored-by: christopher blodgett <christopher.blodgett@gmail.com>

files/autopause/autopause-fcns.sh

@@ -20,12 +20,16 @@ mc_server_listening() {
   mc-monitor status --host localhost --port "$SERVER_PORT" --timeout 10s >& /dev/null
 }
 
-java_clients_connected() {
+java_clients_connections() {
   local connections
   if java_running ; then
     connections=$(mc-monitor status --host localhost --port "$SERVER_PORT" --show-player-count)
   else
     connections=0
   fi
-  (( connections > 0 ))
+  echo $connections
+}
+
+java_clients_connected() {
+  (( $(java_clients_connections) > 0 ))
 }

files/rconcmds/rcon-cmds-daemon.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+
+: "${RCON_CMDS_STARTUP:=}"
+: "${RCON_CMDS_ON_CONNECT:=}"
+: "${RCON_CMDS_ON_DISCONNECT:=}"
+: "${RCON_CMDS_PERIOD:=10}"
+
+# needed for the clients connected function residing in autopause
+# shellcheck source=/autopause/autopause-fcns.sh
+. /autopause/autopause-fcns.sh
+
+# shellcheck source=start-utils
+. ${SCRIPTS:-/}start-utils
+
+run_command(){
+  rcon_cmd="$1"
+  logRcon "running - $rcon_cmd"
+  output=$(rcon-cli "$rcon_cmd")
+  logRcon "$output"
+}
+
+
+# wait for java process to be started
+while :
+do
+  if java_process_exists ; then
+    break
+  fi
+  sleep 0.1
+done
+
+CLIENTCONNECTIONS=0
+STATE=INIT
+
+while :
+do
+  case X$STATE in
+  XINIT)
+    # Server startup
+    if mc_server_listening ; then
+      logRcon "MCServer is listening, running startup"
+      if [[ "$RCON_CMDS_STARTUP" ]]; then
+        while read -r cmd; do
+          run_command "$cmd"
+        done <<< "$RCON_CMDS_STARTUP"
+      fi
+      if [[ -z "$RCON_CMDS_ON_CONNECT" ]] && [[ -z "$RCON_CMDS_ON_DISCONNECT" ]]; then
+        logRcon "No addition rcon commands are given, stopping rcon cmd service"
+        exit 0
+      fi
+      STATE=II
+    fi
+    ;;
+  XII)
+    # Main Loop looking for connections 
+    CURR_CLIENTCONNECTIONS=$(java_clients_connections)
+    if (( CURR_CLIENTCONNECTIONS > CLIENTCONNECTIONS )) && [[ "$RCON_CMDS_ON_CONNECT" ]]; then
+        logRcon "Clients have Connected, running connect cmds"
+        while read -r cmd; do
+          run_command "$cmd"
+        done <<< "$RCON_CMDS_ON_CONNECT"
+    elif (( CURR_CLIENTCONNECTIONS < CLIENTCONNECTIONS )) && [[ "$RCON_CMDS_ON_DISCONNECT" ]]; then
+        logRcon "Clients have Disconnected, running disconnect cmds"
+        while read -r cmd; do
+          run_command "$cmd"
+        done <<< "$RCON_CMDS_ON_DISCONNECT"
+    fi
+    CLIENTCONNECTIONS=$CURR_CLIENTCONNECTIONS
+    ;;
+  *)
+    logRcon "Error: invalid state: $STATE"
+    ;;
+  esac
+  sleep "$RCON_CMDS_PERIOD"
+done