cluster-viewer

#!/bin/bash

# Opens an Akka cluster sharding viewer web page on the specified node, nodes 1-9, default 1.

usage() {
    echo "Usage: $0 [N] - Opens an Akka cluster sharding viewer web page on the specified node N, nodes 1-9, default 1." ; exit 1
}

openViewerWebPage() {
  node=$1

  if hash open 2>/dev/null; then
    open http://127.0.0.1:955$node/viewer
  elif hash xdg-open 2>/dev/null; then
    xdg-open http://127.0.0.1:955$node/viewer
  elif hash cmd 2>/dev/null; then
    cmd /c start http://127.0.0.1:955$node/viewer
  else
    echo "OS \"$OSTYPE\" is not currently supported."
  fi
}

[[ $# = 0 ]] && node=1 || node=$1

if [[ $node =~ ^[1-9]$ ]] ; then
  openViewerWebPage $node
else
  echo "Cluster node number $node is invalid. The node number must be 1 through 9."
  usage
fi