gitlab-org--gitlab-foss/app/models/merge_request_diff.rb
Stan Hu d4fab17d7c Fix Error 500 when viewing old merge requests with bad diff data
Customers running old versions of GitLab may have MergeRequestDiffs with
the text ["--broken diff"] due to text generated by gitlab_git 1.0.3.
To avoid the Error 500, verify that each element is a type that gitlab_git
will accept before attempting to create a DiffCollection.

Closes #20776
2016-10-10 13:05:09 -07:00

303 lines
7.6 KiB
Ruby

class MergeRequestDiff < ActiveRecord::Base
include Sortable
include Importable
include EncodingHelper
# Prevent store of diff if commits amount more then 500
COMMITS_SAFE_SIZE = 100
# Valid types of serialized diffs allowed by Gitlab::Git::Diff
VALID_CLASSES = [Hash, Rugged::Patch, Rugged::Diff::Delta]
belongs_to :merge_request
state_machine :state, initial: :empty do
state :collected
state :overflow
# Deprecated states: these are no longer used but these values may still occur
# in the database.
state :timeout
state :overflow_commits_safe_size
state :overflow_diff_files_limit
state :overflow_diff_lines_limit
end
serialize :st_commits
serialize :st_diffs
# 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?
def self.select_without_diff
select(column_names - ['st_diffs'])
end
def st_commits
super || []
end
# Collect information about commits and diff from repository
# and save it to the database as serialized data
def save_git_content
ensure_commits_sha
save_commits
reload_commits
save_diffs
keep_around_commits
end
def ensure_commits_sha
merge_request.fetch_ref
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
save
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?
last_commit.try(:sha)
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
end
def size
real_size.presence || raw_diffs.size
end
def raw_diffs(options = {})
if options[:ignore_whitespace_change]
@diffs_no_whitespace ||=
Gitlab::Git::Compare.new(
repository.raw_repository,
safe_start_commit_sha,
head_commit_sha).diffs(options)
else
@raw_diffs ||= {}
@raw_diffs[options] ||= load_diffs(st_diffs, options)
end
end
def commits
@commits ||= load_commits(st_commits)
end
def reload_commits
@commits = nil
commits
end
def last_commit
commits.first
end
def first_commit
commits.last
end
def base_commit
return unless base_commit_sha
project.commit(base_commit_sha)
end
def start_commit
return unless start_commit_sha
project.commit(start_commit_sha)
end
def head_commit
return unless head_commit_sha
project.commit(head_commit_sha)
end
def commits_sha
if @commits
commits.map(&:sha)
else
st_commits.map { |commit| commit[:id] }
end
end
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
)
end
def diff_refs_by_sha?
base_commit_sha? && head_commit_sha? && start_commit_sha?
end
def diffs(diff_options = nil)
Gitlab::Diff::FileCollection::MergeRequestDiff.new(self, diff_options: diff_options)
end
def project
merge_request.target_project
end
def compare
@compare ||=
Gitlab::Git::Compare.new(
repository.raw_repository,
safe_start_commit_sha,
head_commit_sha
)
end
def latest?
self == merge_request.merge_request_diff
end
def compare_with(sha)
CompareService.new.execute(project, head_commit_sha, project, sha)
end
private
# Old GitLab implementations may have generated diffs as ["--broken-diff"].
# Avoid an error 500 by ignoring bad elements. See:
# https://gitlab.com/gitlab-org/gitlab-ce/issues/20776
def valid_raw_diff?(raw)
return false unless raw.respond_to?(:each)
raw.any? { |element| VALID_CLASSES.include?(element.class) }
end
def dump_commits(commits)
commits.map(&:to_hash)
end
def load_commits(array)
array.map { |hash| Commit.new(Gitlab::Git::Commit.new(hash), merge_request.source_project) }
end
# Load all commits related to current merge request diff from repo
# and save it as array of hashes in st_commits db field
def save_commits
new_attributes = {}
commits = compare.commits
if commits.present?
commits = Commit.decorate(commits, merge_request.source_project).reverse
new_attributes[:st_commits] = dump_commits(commits)
end
update_columns_serialized(new_attributes)
end
def dump_diffs(diffs)
if diffs.respond_to?(:map)
diffs.map(&:to_hash)
end
end
def load_diffs(raw, options)
if valid_raw_diff?(raw)
if paths = options[:paths]
raw = raw.select do |diff|
paths.include?(diff[:old_path]) || paths.include?(diff[:new_path])
end
end
Gitlab::Git::DiffCollection.new(raw, options)
else
Gitlab::Git::DiffCollection.new([])
end
end
# Load diffs between branches related to current merge request diff from repo
# and save it as array of hashes in st_diffs db field
def save_diffs
new_attributes = {}
new_diffs = []
if commits.size.zero?
new_attributes[:state] = :empty
else
diff_collection = compare.diffs(Commit.max_diff_options)
if diff_collection.overflow?
# Set our state to 'overflow' to make the #empty? and #collected?
# methods (generated by StateMachine) return false.
new_attributes[:state] = :overflow
end
new_attributes[:real_size] = diff_collection.real_size
if diff_collection.any?
new_diffs = dump_diffs(diff_collection)
new_attributes[:state] = :collected
end
end
new_attributes[:st_diffs] = new_diffs
update_columns_serialized(new_attributes)
end
def repository
project.repository
end
def find_base_sha
return unless head_commit_sha && start_commit_sha
project.merge_base_commit(head_commit_sha, start_commit_sha).try(:sha)
end
def utf8_st_diffs
st_diffs.map do |diff|
diff.each do |k, v|
diff[k] = encode_utf8(v) if v.respond_to?(:encoding)
end
end
end
#
# #save or #update_attributes providing changes on serialized attributes do a lot of
# serialization and deserialization calls resulting in bad performance.
# Using #update_columns solves the problem with just one YAML.dump per serialized attribute that we provide.
# As a tradeoff we need to reload the current instance to properly manage time objects on those serialized
# attributes. So to keep the same behaviour as the attribute assignment we reload the instance.
# The difference is in the usage of
# #write_attribute= (#update_attributes) and #raw_write_attribute= (#update_columns)
#
# Ex:
#
# new_attributes[:st_commits].first.slice(:committed_date)
# => {:committed_date=>2014-02-27 11:01:38 +0200}
# YAML.load(YAML.dump(new_attributes[:st_commits].first.slice(:committed_date)))
# => {:committed_date=>2014-02-27 10:01:38 +0100}
#
def update_columns_serialized(new_attributes)
return unless new_attributes.any?
update_columns(new_attributes.merge(updated_at: current_time_from_proper_timezone))
reload
end
def keep_around_commits
repository.keep_around(start_commit_sha)
repository.keep_around(head_commit_sha)
repository.keep_around(base_commit_sha)
end
end