Fix error when viewing diffs without blobs
Old merge requests can have diffs without corresponding blobs. (This also may be possible for commit diffs in corrupt repositories.) We can't use the `&.` operator on the blobs, because the blob objects are never nil, but `BatchLoader` instances that delegate to `Blob`. We can't use `Object#try`, because `Blob` doesn't inherit from `Object`. `BatchLoader` provides a `__sync` method that returns the delegated object, but using `itself` also works because it's forwarded, and will work for non-`BatchLoader` instances too. So the simplest solution is to just use that with the `&.` operator.
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@ -0,0 +1,5 @@
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---
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title: Fix viewing merge request diffs where the underlying blobs are unavailable
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merge_request:
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author:
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type: fixed
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@ -116,8 +116,10 @@ module Gitlab
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new_content_sha || old_content_sha
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end
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# Use #itself to check the value wrapped by a BatchLoader instance, rather
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# than if the BatchLoader instance itself is falsey.
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def blob
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new_blob || old_blob
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new_blob&.itself || old_blob&.itself
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end
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attr_writer :highlighted_diff_lines
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@ -173,7 +175,7 @@ module Gitlab
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end
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def binary?
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has_binary_notice? || old_blob&.binary? || new_blob&.binary?
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has_binary_notice? || try_blobs(:binary?)
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end
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def text?
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@ -181,15 +183,15 @@ module Gitlab
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end
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def external_storage_error?
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old_blob&.external_storage_error? || new_blob&.external_storage_error?
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try_blobs(:external_storage_error?)
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end
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def stored_externally?
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old_blob&.stored_externally? || new_blob&.stored_externally?
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try_blobs(:stored_externally?)
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end
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def external_storage
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old_blob&.external_storage || new_blob&.external_storage
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try_blobs(:external_storage)
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end
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def content_changed?
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@ -204,15 +206,15 @@ module Gitlab
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end
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def size
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[old_blob&.size, new_blob&.size].compact.sum
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valid_blobs.map(&:size).sum
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end
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def raw_size
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[old_blob&.raw_size, new_blob&.raw_size].compact.sum
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valid_blobs.map(&:raw_size).sum
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end
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def raw_binary?
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old_blob&.raw_binary? || new_blob&.raw_binary?
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try_blobs(:raw_binary?)
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end
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def raw_text?
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@ -235,6 +237,19 @@ module Gitlab
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private
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# The blob instances are instances of BatchLoader, which means calling
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# &. directly on them won't work. Object#try also won't work, because Blob
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# doesn't inherit from Object, but from BasicObject (via SimpleDelegator).
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def try_blobs(meth)
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old_blob&.itself&.public_send(meth) || new_blob&.itself&.public_send(meth)
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end
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# We can't use #compact for the same reason we can't use &., but calling
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# #nil? explicitly does work because it is proxied to the blob itself.
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def valid_blobs
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[old_blob, new_blob].reject(&:nil?)
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end
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def text_position_properties(line)
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{ old_line: line.old_line, new_line: line.new_line }
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end
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@ -431,4 +431,29 @@ describe Gitlab::Diff::File do
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end
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end
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end
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context 'when neither blob exists' do
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let(:blank_diff_refs) { Gitlab::Diff::DiffRefs.new(base_sha: Gitlab::Git::BLANK_SHA, head_sha: Gitlab::Git::BLANK_SHA) }
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let(:diff_file) { described_class.new(diff, diff_refs: blank_diff_refs, repository: project.repository) }
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describe '#blob' do
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it 'returns a concrete nil so it can be used in boolean expressions' do
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actual = diff_file.blob && true
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expect(actual).to be_nil
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end
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end
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describe '#binary?' do
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it 'returns false' do
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expect(diff_file).not_to be_binary
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end
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end
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describe '#size' do
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it 'returns zero' do
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expect(diff_file.size).to be_zero
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end
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end
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end
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end
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