Class: RedisCopy::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/redis-copy/cli.rb

Constant Summary collapse

REDIS_URI = 
(/\A(?:redis:\/\/)?([a-z0-9\-.]+)(:[0-9]{1,5})?(\/(?:(?:1[0-5])|[0-9]))?\z/i).freeze
DEFAULTS = 
{
  ui:             :command_line,
  key_emitter:    :default,
  strategy:       :auto,
  pipeline:       :true,
  fail_fast:      false,
  prompt:         true,
  trace:          false,
  allow_nonempty: false,
}.freeze

Instance Method Summary collapse

Constructor Details

#initialize(argv = ARGV) ⇒ CLI 



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# File 'lib/redis-copy/cli.rb', line 20

def initialize(argv = ARGV)
  argv = argv.dup
  options = {}

  OptionParser.new do |opts|
    opts.version = RedisCopy::VERSION
    opts.banner = "#{opts.program_name} v#{opts.version}\n" +
                  "Usage: #{opts.program_name} [options] <source> <destination>"

    indent_desc = proc do |desc|
      desc.split("\n").join("\n#{opts.summary_indent}#{' '*opts.summary_width} ")
    end

    opts.separator "    <source> and <destination> must be redis connection uris"
    opts.separator "    like [redis://]<hostname>[:<port>][/<db>]"
    opts.separator ''
    opts.separator "Specific options:"

    opts.on('--strategy STRATEGY', [:auto, :new, :classic],
      indent_desc.(
        "Select strategy (auto, new, classic) (default #{DEFAULTS[:strategy]})\n" +
        "  auto:    uses new if available, otherwise fallback\n" +
        "  new:     use redis DUMP and RESTORE commands (faster)\n" +
        "  classic: migrates via multiple type-specific commands"
      )
    ) do |strategy|
      options[:strategy] = strategy
    end

    opts.on('--[no-]pipeline',
      "Use redis pipeline where available (default #{DEFAULTS[:pipeline]})"
    ) do |pipeline|
      options[:pipeline] = pipeline
    end

    opts.on('-d', '--[no-]debug', "Write debug output (default #{DEFAULTS[:debug]})") do |debug|
      options[:debug] = debug
    end

    opts.on('-t', '--[no-]trace', "Enable backtrace on failure (default #{DEFAULTS[:trace]})") do |trace|
      options[:trace] = trace
    end

    opts.on('-f', '--[no-]fail-fast', "Abort on first failure (default #{DEFAULTS[:fail_fast]})") do |ff|
      options[:fail_fast] = ff
    end

    opts.on('--[no-]prompt', "Prompt for confirmation (default #{DEFAULTS[:prompt]})") do
      options[:prompt] = true
    end

    opts.on('--[no-]allow-nonempty', "Allow non-empty destination (default #{DEFAULTS[:allow_nonempty]})") do |allow_nonempty|
      options[:allow_nonempty] = allow_nonempty
    end

    opts.on('--[no-]dry-run', 'Output configuration and exit') do |d|
      options[:dry_run] = true
    end

    opts.parse!(argv)
    unless argv.size == 2
      opts.abort "Source and Destination must be specified\n\n" +
                        opts.help
    end
    @source = argv.shift
    @destination = argv.shift

    opts.abort "source is not valid URI" unless @source =~ REDIS_URI
    opts.abort "destination is not valid URI" unless @destination =~ REDIS_URI
  end

  @config = DEFAULTS.merge(options)
end

Instance Method Details

#run! ⇒ Object 



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# File 'lib/redis-copy/cli.rb', line 94

def run!
  (puts self.inspect; exit 1) if @config.delete(:dry_run)

  RedisCopy::copy(@source, @destination, @config)
rescue => exception
  $stderr.puts exception.message
  $stderr.puts exception.backtrace if @config[:trace]
  exit 1
end