Copying over data from Solid Cache to Redis

copy-data-from-solid-cache-to-redis.rb

stats = { total: 0, success: 0, failed: 0 }
failed_entries = []

redis = Redis.new(url: ENV[Rails.application.secrets.redis_cache_url])

SolidCache::Entry.find_each(batch_size: 1000) do |item|
  stats[:total] += 1

  key = item.key
  # We need to use Rails.cache to access Solid Cache here.
  # The reason is because SolidCache::Entry.first.value will 
  # be encoded in binary format and the data will be compressed.
  # It is easier to get the data like so rather than reading
  # directly from the table.
  value = Rails.cache.read(key)
  begin
    if value != nil
      redis.set(key, value)
      stats[:success] += 1
    end
  rescue => e
    stats[:failed] += 1
    failed_entries << {
      key: item.key,
      error: e.message
    }
    puts "Failed to migrate entry with key: #{item.key}"
    puts "Error: #{e.message}"
  end
end

puts stats