remove fix validatable import url migration

db/migrate/20160620110927_fix_no_validatable_import_url.rb

-# Updates project records containing invalid URLs using the AddressableUrlValidator.
-# This is optimized assuming the number of invalid records is low, but
-# we still need to loop through all the projects with an +import_url+
-# so we use batching for the latter.
-#
-# This migration is non-reversible as we would have to keep the old data.
-
-class FixNoValidatableImportUrl < ActiveRecord::Migration
-  include Gitlab::Database::MigrationHelpers
-  class SqlBatches
-
-    attr_reader :results, :query
-
-    def initialize(batch_size: 1000, query:)
-      @offset = 0
-      @batch_size = batch_size
-      @query = query
-      @results = []
-    end
-
-    def next?
-      @results = ActiveRecord::Base.connection.exec_query(batched_sql)
-      @offset += @batch_size
-      @results.any?
-    end
-
-    private
-
-    def batched_sql
-      "#{@query} LIMIT #{@batch_size} OFFSET #{@offset}"
-    end
-  end
-
-  # AddressableValidator - Snapshot of AddressableUrlValidator
-  module AddressableUrlValidatorSnap
-    extend self
-
-    def valid_url?(value)
-      return false unless value
-
-      valid_uri?(value) && valid_protocol?(value)
-    rescue Addressable::URI::InvalidURIError
-      false
-    end
-
-    def valid_uri?(value)
-      Addressable::URI.parse(value).is_a?(Addressable::URI)
-    end
-
-    def valid_protocol?(value)
-      value =~ /\A#{URI.regexp(%w(http https ssh git))}\z/
-    end
-  end
-
-  def up
-    unless defined?(Addressable::URI::InvalidURIError)
-      say('Skipping cleaning up invalid import URLs as class from Addressable is missing')
-      return
-    end
-
-    say('Nullifying empty import URLs')
-
-    nullify_empty_urls
-
-    say('Cleaning up invalid import URLs... This may take a few minutes if we have a large number of imported projects.')
-
-    process_invalid_import_urls
-  end
-
-  def process_invalid_import_urls
-    batches = SqlBatches.new(query: "SELECT id, import_url FROM projects WHERE import_url IS NOT NULL")
-
-    while batches.next?
-      project_ids = []
-
-      batches.results.each do |result|
-        project_ids << result['id'] unless valid_url?(result['import_url'])
-      end
-
-      process_batch(project_ids)
-    end
-
-  end
-
-  def process_batch(project_ids)
-    Thread.new do
-      begin
-        project_ids.each { |project_id| cleanup_import_url(project_id) }
-      ensure
-        ActiveRecord::Base.connection.close
-      end
-    end.join
-  end
-
-  def valid_url?(url)
-    AddressableUrlValidatorSnap.valid_url?(url)
-  end
-
-  def cleanup_import_url(project_id)
-    execute("UPDATE projects SET import_url = NULL WHERE id = #{project_id}")
-  end
-
-  def nullify_empty_urls
-    execute("UPDATE projects SET import_url = NULL WHERE import_url = ''")
-  end
-end