Module: Katello::Util::Support

Defined in:
app/lib/katello/util/support.rb

Class Method Summary collapse

Class Method Details

.active_record_retry(retries = 3) ⇒ Object

Used for retrying active record transactions when race conditions could cause RecordNotUnique exceptions



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# File 'app/lib/katello/util/support.rb', line 96

def self.active_record_retry(retries = 3)
  yield
rescue ActiveRecord::RecordNotUnique, PG::UniqueViolation, ActiveRecord::RecordInvalid => e
  retries -= 1
  if retries == 0
    raise e
  else
    retry
  end
end

.active_record_retry_connect(logger) ⇒ Object 



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# File 'app/lib/katello/util/support.rb', line 86

def self.active_record_retry_connect(logger)
  sleep 3
  ActiveRecord::Base.connection.reconnect!
rescue
  logger.error("Trying to reconnect to the database.")
  retry
end

.array_with_total(a = []) ⇒ Object

We need this so that we can return empty search results on an invalid query Basically this is a empty array with a total method.



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# File 'app/lib/katello/util/support.rb', line 111

def self.array_with_total(a = [])
  def a.total
    size
  end
  a
end

.deep_copy(object) ⇒ Object 



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# File 'app/lib/katello/util/support.rb', line 4

def self.deep_copy(object)
  Marshal.load(Marshal.dump(object))
end

.diff_hash_params(rule, params) ⇒ Object

Given a rules hash in the format { => ...} the method will match the params attributes to provided rule and return a diff. Here are some of the examples rule -> => [[:name, :version, :min_version, :max_version]] will match -> => [{:name = > "boo", :version => "2.0", = > "Foo", :min_version => "2.0"]} rule -> => [[:id]], :date_range => [:start, :end], :errata_type => {, :severity => {}} will match -> => [{:id => 100], :date_range => => "05/14/2011"} Note of caution this merely shows differences in the structure of params vs rules. It doesnt validate anything. Look at SerializedParamsValidator method for its uses.



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# File 'app/lib/katello/util/support.rb', line 47

def self.diff_hash_params(rule, params)
  params = params.with_indifferent_access
  if rule.is_a?(Array)
    return stringify(params.keys) - stringify(rule)
  end

  rule = rule.with_indifferent_access
  diff_data = rule.keys.collect do |k|
    if params[k]
      if params[k].is_a?(Array) && rule[k].first.is_a?(Array)
        diffs = params[k].collect { |pk| diff_hash_params(rule[k].first, pk) }.flatten
        diffs
      elsif params[k].is_a?(Hash)
        keys = stringify(params[k].keys) - stringify(rule[k])
        if keys.empty?
          nil
        else
          {k => keys}
        end
      end
    end
  end
  diff_data = diff_data.compact.flatten

  return diff_data unless diff_data.blank?
  stringify(params.keys) - stringify(rule.keys)
end

.scrub(params, &block_to_match) ⇒ Object 



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# File 'app/lib/katello/util/support.rb', line 14

def self.scrub(params, &block_to_match)
  params.each_key do |key|
    if params[key].is_a?(Hash)
      scrub(params[key], &block_to_match)
    elsif block_to_match.call(key, params[key])
      params[key] = "[FILTERED]"
    end
  end
  params
end

.stringify(col) ⇒ Object

Helper method to just convert a collection of objects to their string representation (mostly to be used internally)



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# File 'app/lib/katello/util/support.rb', line 28

def self.stringify(col)
  col.collect { |c| c.to_s }
end

.time ⇒ Object 



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# File 'app/lib/katello/util/support.rb', line 8

def self.time
  a = Time.now
  yield
  Time.now - a
end

.with_db_connection(logger = Rails.logger) ⇒ Object 



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# File 'app/lib/katello/util/support.rb', line 75

def self.with_db_connection(logger = Rails.logger)
  yield
rescue PG::ConnectionBad, ActiveRecord::StatementInvalid, ActiveRecord::ConnectionNotEstablished => e
  logger.error(e.message)
  logger.error("Lost database connection. Attempting reconnect.")

  active_record_retry_connect(logger)

  retry
end