Process commits in a separate worker

This moves the code used for processing commits from GitPushService to
its own Sidekiq worker: ProcessCommitWorker.

Using a Sidekiq worker allows us to process multiple commits in
parallel. This in turn will lead to issues being closed faster and cross
references being created faster. Furthermore by isolating this code into
a separate class it's easier to test and maintain the code.

The new worker also ensures it can efficiently check which issues can be
closed, without having to run numerous SQL queries for every issue.

1 files changed, 3 insertions, 34 deletions

diff --git a/app/services/git_push_service.rb b/app/services/git_push_service.rb
index e8415862de5..de313095bed 100644
--- a/app/services/git_push_service.rb
+++ b/app/services/git_push_service.rb
@@ -105,35 +105,11 @@ class GitPushService < BaseService
   # Extract any GFM references from the pushed commit messages. If the configured issue-closing regex is matched,
   # close the referenced Issue. Create cross-reference Notes corresponding to any other referenced Mentionables.
   def process_commit_messages
-    is_default_branch = is_default_branch?
-
-    authors = Hash.new do |hash, commit|
-      email = commit.author_email
-      next hash[email] if hash.has_key?(email)
-
-      hash[email] = commit_user(commit)
-    end
+    default = is_default_branch?
 
     @push_commits.each do |commit|
-      # Keep track of the issues that will be actually closed because they are on a default branch.
-      # Hence, when creating cross-reference notes, the not-closed issues (on non-default branches)
-      # will also have cross-reference.
-      closed_issues = []
-
-      if is_default_branch
-        # Close issues if these commits were pushed to the project's default branch and the commit message matches the
-        # closing regex. Exclude any mentioned Issues from cross-referencing even if the commits are being pushed to
-        # a different branch.
-        closed_issues = commit.closes_issues(current_user)
-        closed_issues.each do |issue|
-          if can?(current_user, :update_issue, issue)
-            Issues::CloseService.new(project, authors[commit], {}).execute(issue, commit: commit)
-          end
-        end
-      end
-
-      commit.create_cross_references!(authors[commit], closed_issues)
-      update_issue_metrics(commit, authors)
+      ProcessCommitWorker.
+        perform_async(project.id, current_user.id, commit.id, default)
     end
   end
 
@@ -176,11 +152,4 @@ class GitPushService < BaseService
   def branch_name
     @branch_name ||= Gitlab::Git.ref_name(params[:ref])
   end
-
-  def update_issue_metrics(commit, authors)
-    mentioned_issues = commit.all_references(authors[commit]).issues
-
-    Issue::Metrics.where(issue_id: mentioned_issues.map(&:id), first_mentioned_in_commit_at: nil).
-      update_all(first_mentioned_in_commit_at: commit.committed_date)
-  end
 end