158 lines
3.8 KiB
Ruby
158 lines
3.8 KiB
Ruby
# frozen_string_literal: true
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# Gitaly note: JV: no RPC's here.
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module Gitlab
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module Git
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class DiffCollection
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include Enumerable
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DEFAULT_LIMITS = { max_files: 100, max_lines: 5000 }.freeze
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attr_reader :limits
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delegate :max_files, :max_lines, :max_bytes, :safe_max_files, :safe_max_lines, :safe_max_bytes, to: :limits
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def self.limits(options = {})
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limits = {}
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limits[:max_files] = options.fetch(:max_files, DEFAULT_LIMITS[:max_files])
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limits[:max_lines] = options.fetch(:max_lines, DEFAULT_LIMITS[:max_lines])
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limits[:max_bytes] = limits[:max_files] * 5.kilobytes # Average 5 KB per file
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limits[:safe_max_files] = [limits[:max_files], DEFAULT_LIMITS[:max_files]].min
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limits[:safe_max_lines] = [limits[:max_lines], DEFAULT_LIMITS[:max_lines]].min
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limits[:safe_max_bytes] = limits[:safe_max_files] * 5.kilobytes # Average 5 KB per file
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limits[:max_patch_bytes] = Gitlab::Git::Diff.patch_hard_limit_bytes
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OpenStruct.new(limits)
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end
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def initialize(iterator, options = {})
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@iterator = iterator
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@limits = self.class.limits(options)
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@enforce_limits = !!options.fetch(:limits, true)
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@expanded = !!options.fetch(:expanded, true)
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@line_count = 0
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@byte_count = 0
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@overflow = false
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@empty = true
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@array = Array.new
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end
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def each(&block)
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@array.each(&block)
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return if @overflow
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return if @iterator.nil?
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if @iterator.is_a?(Gitlab::GitalyClient::DiffStitcher)
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each_gitaly_patch(&block)
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else
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each_serialized_patch(&block)
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end
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@populated = true
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# Allow iterator to be garbage-collected. It cannot be reused anyway.
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@iterator = nil
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end
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def empty?
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any? # Make sure the iterator has been exercised
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@empty
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end
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def overflow?
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populate!
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!!@overflow
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end
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def size
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@size ||= count # forces a loop using each method
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end
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def real_size
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populate!
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if @overflow
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"#{size}+"
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else
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size.to_s
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end
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end
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def decorate!
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collection = each_with_index do |element, i|
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@array[i] = yield(element)
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end
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collection
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end
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alias_method :to_ary, :to_a
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private
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def populate!
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return if @populated
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each { nil } # force a loop through all diffs
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nil
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end
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def over_safe_limits?(files)
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files >= safe_max_files || @line_count > safe_max_lines || @byte_count >= safe_max_bytes
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end
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def each_gitaly_patch
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i = @array.length
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@iterator.each do |raw|
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diff = Gitlab::Git::Diff.new(raw, expanded: !@enforce_limits || @expanded)
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if raw.overflow_marker
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@overflow = true
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break
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end
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yield @array[i] = diff
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i += 1
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end
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end
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def each_serialized_patch
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i = @array.length
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@iterator.each do |raw|
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@empty = false
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if @enforce_limits && i >= max_files
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@overflow = true
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break
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end
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expanded = !@enforce_limits || @expanded
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diff = Gitlab::Git::Diff.new(raw, expanded: expanded)
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if !expanded && over_safe_limits?(i) && diff.line_count > 0
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diff.collapse!
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end
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@line_count += diff.line_count
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@byte_count += diff.diff.bytesize
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if @enforce_limits && (@line_count >= max_lines || @byte_count >= max_bytes)
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# This last Diff instance pushes us over the lines limit. We stop and
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# discard it.
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@overflow = true
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break
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end
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yield @array[i] = diff
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i += 1
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end
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end
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end
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end
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end
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