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# == Schema Information
#
# Table name: merge_request_diffs
#
# id :integer not null, primary key
# state :string(255)
# st_commits :text
# st_diffs :text
# merge_request_id :integer not null
# created_at :datetime
# updated_at :datetime
#
require Rails.root.join("app/models/commit")
class MergeRequestDiff < ActiveRecord::Base
# Prevent store of diff
# if commits amount more then 200
COMMITS_SAFE_SIZE = 200
attr_reader :commits, :diffs
belongs_to :merge_request
delegate :target_branch, :source_branch, to: :merge_request, prefix: nil
state_machine :state, initial: :empty do
state :collected
state :timeout
state :overflow_commits_safe_size
state :overflow_diff_files_limit
state :overflow_diff_lines_limit
end
serialize :st_commits
serialize :st_diffs
after_create :reload_content
def reload_content
reload_commits
reload_diffs
end
def diffs
@diffs ||= (load_diffs(st_diffs) || [])
end
def commits
@commits ||= load_commits(st_commits || [])
end
def last_commit
commits.first
end
def last_commit_short_sha
@last_commit_short_sha ||= last_commit.short_id
end
private
def dump_commits(commits)
commits.map(&:to_hash)
end
def load_commits(array)
array.map { |hash| Commit.new(Gitlab::Git::Commit.new(hash)) }
end
def dump_diffs(diffs)
if diffs.respond_to?(:map)
diffs.map(&:to_hash)
end
end
def load_diffs(raw)
if raw.respond_to?(:map)
raw.map { |hash| Gitlab::Git::Diff.new(hash) }
end
end
# Collect array of Git::Commit objects
# between target and source branches
def unmerged_commits
commits = compare_result.commits
if commits.present?
commits = Commit.decorate(commits).
sort_by(&:created_at).
reverse
end
commits
end
# Reload all commits related to current merge request from repo
# and save it as array of hashes in st_commits db field
def reload_commits
commit_objects = unmerged_commits
if commit_objects.present?
self.st_commits = dump_commits(commit_objects)
end
save
end
# Reload diffs between branches related to current merge request from repo
# and save it as array of hashes in st_diffs db field
def reload_diffs
new_diffs = []
if commits.size.zero?
self.state = :empty
elsif commits.size > COMMITS_SAFE_SIZE
self.state = :overflow_commits_safe_size
else
new_diffs = unmerged_diffs
end
if new_diffs.any?
if new_diffs.size > Commit::DIFF_HARD_LIMIT_FILES
self.state = :overflow_diff_files_limit
new_diffs = []
end
if new_diffs.sum { |diff| diff.diff.lines.count } > Commit::DIFF_HARD_LIMIT_LINES
self.state = :overflow_diff_lines_limit
new_diffs = []
end
end
if new_diffs.present?
new_diffs = dump_commits(new_diffs)
self.state = :collected
end
self.st_diffs = new_diffs
self.save
end
# Collect array of Git::Diff objects
# between target and source branches
def unmerged_diffs
diffs = compare_result.diffs
diffs ||= []
diffs
rescue Gitlab::Git::Diff::TimeoutError => ex
self.state = :timeout
diffs = []
end
def repository
merge_request.target_project.repository
end
private
def compare_result
@compare_result ||= CompareService.new.execute(
merge_request.author,
merge_request.source_project,
merge_request.source_branch,
merge_request.target_project,
merge_request.target_branch,
)
end
end
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