Connect To Azure Redis Instance Using TLS and stunnel

az-redis-cli.ps1

<#
.SYNOPSIS
  Connect to Azure Redis CLI over TLS instances using Stunnel. 

.Description
  This script helps you manage connecting to multiple redis instances in Azure by modifying the stunnel config automagically

  ASSUMPTIONS AND WARNINGS:
  ==============================
  - Must run in an elevated PowerShell prompt
  - redis-cli Windows binary exists in the system path (aka we can call redis-cli from anywhere and it will run)
  - Stunnel is installed to C:\Program Files (x86)\stunnel
  - Stunnel is installed as a Windows Service. To do this, run: "C:\Program Files (x86)\stunnel\bin\stunnel.exe -install"
  - WARNING: THIS WILL OVERWRITE THE stunnel CONFIG FILE HERE: "C:\Program Files (x86)\stunnel\config\stunnel.conf"

.NOTES
  Version:        1.0.0
  Author:         jcefoli
  Creation Date:  1/29/2019

.PARAMETER redisName
  The Azure Redis instance name (do not include .redis.cache.windows.net)

.PARAMETER redisPW
  The password to the Redis instance

.EXAMPLE
  ./az-redis-cli.ps1 -redisName "myapp-redis-staging" -redisPW "LetMeIn!"

#>

#Requires -RunAsAdministrator

param (
  [Parameter(Mandatory=$true,
    HelpMessage="redisName parameter is missing.")]
    [string] $redisName,
  [Parameter(Mandatory=$true,
    HelpMessage="redisPW parameter is missing.")]
    [string] $redisPW
)

function Update-Stunnel_Redis_Config {

  # Do not change indenting below. Powershell Heredocs should not be indented within the function
  $configFileContents = @"
[redis-cli]
client = yes
accept = 127.0.0.1:6380
connect = $redisName.redis.cache.windows.net:6380
"@

  #Write new config file
  [IO.File]::WriteAllLines("C:\Program Files (x86)\stunnel\config\stunnel.conf", $configFileContents)

}

# Check if Service is Running & Update Config
if ((Get-Service -Name "stunnel").status -eq "Running") {

  Update-Stunnel_Redis_Config

  . "C:\Program Files (x86)\stunnel\bin\stunnel.exe" -reload

} else {

  Update-Stunnel_Redis_Config
  . "C:\Program Files (x86)\stunnel\bin\stunnel.exe" -start

}

#Connect to Redis via CLI
$host.ui.RawUI.WindowTitle = "$redisName.redis.cache.windows.net:6380"
. redis-cli -p 6380 -a $redisPW