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module Gitlab
module Verify
class BatchVerifier
attr_reader :batch_size, :start, :finish
def initialize(batch_size:, start: nil, finish: nil)
@batch_size = batch_size
@start = start
@finish = finish
end
# Yields a Range of IDs and a Hash of failed verifications (object => error)
def run_batches(&blk)
relation.in_batches(of: batch_size, start: start, finish: finish) do |relation| # rubocop: disable Cop/InBatches
range = relation.first.id..relation.last.id
failures = run_batch(relation)
yield(range, failures)
end
end
def name
raise NotImplementedError.new
end
def describe(_object)
raise NotImplementedError.new
end
private
def run_batch(relation)
relation.map { |upload| verify(upload) }.compact.to_h
end
def verify(object)
expected = expected_checksum(object)
actual = actual_checksum(object)
raise 'Checksum missing' unless expected.present?
raise 'Checksum mismatch' unless expected == actual
nil
rescue => err
[object, err]
end
# This should return an ActiveRecord::Relation suitable for calling #in_batches on
def relation
raise NotImplementedError.new
end
# The checksum we expect the object to have
def expected_checksum(_object)
raise NotImplementedError.new
end
# The freshly-recalculated checksum of the object
def actual_checksum(_object)
raise NotImplementedError.new
end
end
end
end
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