debian-mirror-gitlab/app/models/merge_request_diff.rb

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# frozen_string_literal: true
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class MergeRequestDiff < ActiveRecord::Base
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include Sortable
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include Importable
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include ManualInverseAssociation
include IgnorableColumn
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include EachBatch
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# Don't display more than 100 commits at once
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COMMITS_SAFE_SIZE = 100
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ignore_column :st_commits,
:st_diffs
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belongs_to :merge_request
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manual_inverse_association :merge_request, :merge_request_diff
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has_many :merge_request_diff_files, -> { order(:merge_request_diff_id, :relative_order) }
has_many :merge_request_diff_commits, -> { order(:merge_request_diff_id, :relative_order) }
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state_machine :state, initial: :empty do
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event :clean do
transition any => :without_files
end
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state :collected
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state :overflow
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# Diff files have been deleted by the system
state :without_files
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# Deprecated states: these are no longer used but these values may still occur
# in the database.
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state :timeout
state :overflow_commits_safe_size
state :overflow_diff_files_limit
state :overflow_diff_lines_limit
end
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scope :with_files, -> { without_states(:without_files, :empty) }
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scope :viewable, -> { without_state(:empty) }
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scope :by_commit_sha, ->(sha) do
joins(:merge_request_diff_commits).where(merge_request_diff_commits: { sha: sha }).reorder(nil)
end
scope :recent, -> { order(id: :desc).limit(100) }
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# All diff information is collected from repository after object is created.
# It allows you to override variables like head_commit_sha before getting diff.
after_create :save_git_content, unless: :importing?
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def self.find_by_diff_refs(diff_refs)
find_by(start_commit_sha: diff_refs.start_sha, head_commit_sha: diff_refs.head_sha, base_commit_sha: diff_refs.base_sha)
end
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def viewable?
collected? || without_files? || overflow?
end
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# Collect information about commits and diff from repository
# and save it to the database as serialized data
def save_git_content
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MergeRequest
.where('id = ? AND COALESCE(latest_merge_request_diff_id, 0) < ?', self.merge_request_id, self.id)
.update_all(latest_merge_request_diff_id: self.id)
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ensure_commit_shas
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save_commits
save_diffs
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save
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keep_around_commits
end
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def ensure_commit_shas
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self.start_commit_sha ||= merge_request.target_branch_sha
self.head_commit_sha ||= merge_request.source_branch_sha
self.base_commit_sha ||= find_base_sha
end
# Override head_commit_sha to keep compatibility with merge request diff
# created before version 8.4 that does not store head_commit_sha in separate db field.
def head_commit_sha
if persisted? && super.nil?
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last_commit_sha
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else
super
end
end
# This method will rely on repository branch sha
# in case start_commit_sha is nil. Its necesarry for old merge request diff
# created before version 8.4 to work
def safe_start_commit_sha
start_commit_sha || merge_request.target_branch_sha
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end
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def size
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real_size.presence || raw_diffs.size
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end
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def raw_diffs(options = {})
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if options[:ignore_whitespace_change]
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@diffs_no_whitespace ||= compare.diffs(options)
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else
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@raw_diffs ||= {}
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@raw_diffs[options] ||= load_diffs(options)
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end
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end
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def commits
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@commits ||= load_commits
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end
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def last_commit_sha
commit_shas.first
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end
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def first_commit
commits.last
end
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def base_commit
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return unless base_commit_sha
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project.commit_by(oid: base_commit_sha)
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end
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def start_commit
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return unless start_commit_sha
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project.commit_by(oid: start_commit_sha)
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end
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def head_commit
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return unless head_commit_sha
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project.commit_by(oid: head_commit_sha)
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end
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def commit_shas
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merge_request_diff_commits.map(&:sha)
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end
def diff_refs=(new_diff_refs)
self.base_commit_sha = new_diff_refs&.base_sha
self.start_commit_sha = new_diff_refs&.start_sha
self.head_commit_sha = new_diff_refs&.head_sha
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end
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def diff_refs
return unless start_commit_sha || base_commit_sha
Gitlab::Diff::DiffRefs.new(
base_sha: base_commit_sha,
start_sha: start_commit_sha,
head_sha: head_commit_sha
)
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end
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# MRs created before 8.4 don't store their true diff refs (start and base),
# but we need to get a commit SHA for the "View file @ ..." link by a file,
# so we use an approximation of the diff refs if we can't get the actual one.
#
# These will not be the actual diff refs if the target branch was merged into
# the source branch after the merge request was created, but it is good enough
# for the specific purpose of linking to a commit.
#
# It is not good enough for highlighting diffs, so we can't simply pass
# these as `diff_refs.`
def fallback_diff_refs
real_refs = diff_refs
return real_refs if real_refs
likely_base_commit_sha = (first_commit&.parent || first_commit)&.sha
Gitlab::Diff::DiffRefs.new(
base_sha: likely_base_commit_sha,
start_sha: safe_start_commit_sha,
head_sha: head_commit_sha
)
end
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def diff_refs_by_sha?
base_commit_sha? && head_commit_sha? && start_commit_sha?
end
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def diffs(diff_options = nil)
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if without_files? && comparison = diff_refs&.compare_in(project)
# It should fetch the repository when diffs are cleaned by the system.
# We don't keep these for storage overload purposes.
# See https://gitlab.com/gitlab-org/gitlab-ce/issues/37639
comparison.diffs(diff_options)
else
diffs_collection(diff_options)
end
end
# Should always return the DB persisted diffs collection
# (e.g. Gitlab::Diff::FileCollection::MergeRequestDiff.
# It's useful when trying to invalidate old caches through
# FileCollection::MergeRequestDiff#clear_cache!
def diffs_collection(diff_options = nil)
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Gitlab::Diff::FileCollection::MergeRequestDiff.new(self, diff_options: diff_options)
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end
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def project
merge_request.target_project
end
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def compare
@compare ||=
Gitlab::Git::Compare.new(
repository.raw_repository,
safe_start_commit_sha,
head_commit_sha
)
end
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def latest?
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self.id == merge_request.latest_merge_request_diff_id
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end
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def compare_with(sha)
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# When compare merge request versions we want diff A..B instead of A...B
# so we handle cases when user does squash and rebase of the commits between versions.
# For this reason we set straight to true by default.
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CompareService.new(project, head_commit_sha).execute(project, sha, straight: true)
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end
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private
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def create_merge_request_diff_files(diffs)
rows = diffs.map.with_index do |diff, index|
diff_hash = diff.to_hash.merge(
binary: false,
merge_request_diff_id: self.id,
relative_order: index
)
# Compatibility with old diffs created with Psych.
diff_hash.tap do |hash|
diff_text = hash[:diff]
if diff_text.encoding == Encoding::BINARY && !diff_text.ascii_only?
hash[:binary] = true
hash[:diff] = [diff_text].pack('m0')
end
end
end
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Gitlab::Database.bulk_insert('merge_request_diff_files', rows)
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end
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def load_diffs(options)
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collection = merge_request_diff_files
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if paths = options[:paths]
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collection = collection.where('old_path IN (?) OR new_path IN (?)', paths, paths)
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end
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Gitlab::Git::DiffCollection.new(collection.map(&:to_hash), options)
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end
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def load_commits
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commits = merge_request_diff_commits.map { |commit| Commit.from_hash(commit.to_hash, project) }
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CommitCollection
.new(merge_request.source_project, commits, merge_request.source_branch)
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end
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def save_diffs
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new_attributes = {}
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if compare.commits.size.zero?
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new_attributes[:state] = :empty
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else
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diff_collection = compare.diffs(Commit.max_diff_options)
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new_attributes[:real_size] = diff_collection.real_size
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if diff_collection.any?
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new_attributes[:state] = :collected
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create_merge_request_diff_files(diff_collection)
end
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# Set our state to 'overflow' to make the #empty? and #collected?
# methods (generated by StateMachine) return false.
#
# This attribution has to come at the end of the method so 'overflow'
# state does not get overridden by 'collected'.
new_attributes[:state] = :overflow if diff_collection.overflow?
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end
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assign_attributes(new_attributes)
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end
def save_commits
MergeRequestDiffCommit.create_bulk(self.id, compare.commits.reverse)
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# merge_request_diff_commits.reload is preferred way to reload associated
# objects but it returns cached result for some reason in this case
commits = merge_request_diff_commits(true)
self.commits_count = commits.size
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end
def repository
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project.repository
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end
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def find_base_sha
return unless head_commit_sha && start_commit_sha
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project.merge_base_commit(head_commit_sha, start_commit_sha).try(:sha)
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end
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def keep_around_commits
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[repository, merge_request.source_project.repository].uniq.each do |repo|
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repo.keep_around(start_commit_sha, head_commit_sha, base_commit_sha)
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end
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end
end