(DIO-2186) Add vmp_utils cli tool

This adds a thor-based cli under the utils folder. Its initial function
is to make it easier to migrate tokens from one redis instance to
another.

utils/vmp_utils

@@ -0,0 +1,86 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'date'
+require 'json'
+require 'redis'
+require 'thor'
+
+class VMPUtils < Thor
+  desc 'export_tokens', 'Export VMPooler tokens'
+  long_desc <<-LONGDESC
+    vmp_utils export_tokens will export the tokens stored in redis as JSON
+    to the specified file. By default it will export all tokens used within
+    the last year. This can be overridden by setting the "since-date" option.
+  LONGDESC
+  option :since_date, default: (DateTime.now - 365).iso8601
+  option :redis_host, required: true
+  option :redis_password
+  option :redis_port, type: :numeric, default: 6379
+  option :output_file, required: true
+  def export_tokens
+    redis = Redis.new(host: options[:redis_host], port: options[:redis_port], password: options[:redis_password])
+    begin
+      redis.ping
+      puts "connection successful to #{options[:redis_host]}"
+      tokens_to_export = {}
+      date_filter = DateTime.parse(options[:since_date])
+      redis.scan_each(match: 'vmpooler__token__*') do |key|
+        print('.')
+        key_data = redis.hgetall(key)
+        export = false
+        if key_data.key?('last') && date_filter < DateTime.parse(key_data['last'])
+          export = true
+        elsif date_filter < DateTime.parse(key_data['created'])
+          export = true
+        end
+        tokens_to_export[key] = key_data if export
+      end
+      puts ''
+      File.open(options[:output_file], 'w') do |output|
+        output.puts JSON.pretty_generate(tokens_to_export)
+      end
+    rescue Redis::CannotConnectError => e
+      raise Thor::Error, e
+    rescue Redis::CommandError => e
+      raise Thor::Error, e
+    end
+  end
+
+  desc 'import_tokens', 'Import previously exported VMPooler tokens'
+  long_desc <<-LONGDESC
+    vmp_utils import_tokens will load tokens from a previous export into the
+    specified redis instance. It expects a JSON file like the one generated by
+    export_tokens to be provided as input.
+  LONGDESC
+  option :redis_host, required: true
+  option :redis_password
+  option :redis_port, type: :numeric, default: 6379
+  option :input_file, required: true
+  def import_tokens
+    raise Thor::Error, "input-file '#{options[:input_file]}' doesn't exist" unless File.exist?(options[:input_file])
+
+    begin
+      data_file = File.read(options[:input_file])
+      tokens_to_import = JSON.parse(data_file)
+    rescue JSON::ParserError
+      raise Thor::Error, "Unable to parse please verify that #{options[:input_file]}. Please make sure it is a valid JSON file"
+    end
+
+    redis = Redis.new(host: options[:redis_host], port: options[:redis_port], password: options[:redis_password])
+    begin
+      redis.ping
+      puts "connection successful to #{options[:redis_host]}"
+      tokens_to_import.each do |key, value|
+        puts "importing token for #{value['user']}"
+        redis.hset(key, value)
+      end
+    rescue Redis::CannotConnectError => e
+      raise Thor::Error, e
+    rescue Redis::CommandError => e
+      raise Thor::Error, e
+    end
+  end
+end
+
+VMPUtils.start(ARGV)