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module Gitlab
module Git
class DiffCollection
include Enumerable
DEFAULT_LIMITS = { max_files: 100, max_lines: 5000 }.freeze
def initialize(iterator, options = {})
@iterator = iterator
@max_files = options.fetch(:max_files, DEFAULT_LIMITS[:max_files])
@max_lines = options.fetch(:max_lines, DEFAULT_LIMITS[:max_lines])
@max_bytes = @max_files * 5.kilobytes # Average 5 KB per file
@safe_max_files = [@max_files, DEFAULT_LIMITS[:max_files]].min
@safe_max_lines = [@max_lines, DEFAULT_LIMITS[:max_lines]].min
@safe_max_bytes = @safe_max_files * 5.kilobytes # Average 5 KB per file
@enforce_limits = !!options.fetch(:limits, true)
@expanded = !!options.fetch(:expanded, true)
@line_count = 0
@byte_count = 0
@overflow = false
@empty = true
@array = Array.new
end
def each(&block)
Gitlab::GitalyClient.migrate(:commit_raw_diffs) do
each_patch(&block)
end
end
def empty?
any? # Make sure the iterator has been exercised
@empty
end
def overflow?
populate!
!!@overflow
end
def size
@size ||= count # forces a loop using each method
end
def real_size
populate!
if @overflow
"#{size}+"
else
size.to_s
end
end
def decorate!
collection = each_with_index do |element, i|
@array[i] = yield(element)
end
collection
end
alias_method :to_ary, :to_a
private
def populate!
return if @populated
each { nil } # force a loop through all diffs
nil
end
def over_safe_limits?(files)
files >= @safe_max_files || @line_count > @safe_max_lines || @byte_count >= @safe_max_bytes
end
def each_patch
i = 0
@array.each do |diff|
yield diff
i += 1
end
return if @overflow
return if @iterator.nil?
@iterator.each do |raw|
@empty = false
if @enforce_limits && i >= @max_files
@overflow = true
break
end
expanded = !@enforce_limits || @expanded
diff = Gitlab::Git::Diff.new(raw, expanded: expanded)
if !expanded && over_safe_limits?(i)
diff.collapse!
end
@line_count += diff.line_count
@byte_count += diff.diff.bytesize
if @enforce_limits && (@line_count >= @max_lines || @byte_count >= @max_bytes)
# This last Diff instance pushes us over the lines limit. We stop and
# discard it.
@overflow = true
break
end
yield @array[i] = diff
i += 1
end
@populated = true
# Allow iterator to be garbage-collected. It cannot be reused anyway.
@iterator = nil
end
end
end
end
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