1 files changed, 105 insertions, 0 deletions
diff --git a/spec/rack_servers/unicorn_spec.rb b/spec/rack_servers/unicorn_spec.rb
new file mode 100644
index 00000000000..6a02ebcd048
--- /dev/null
+++ b/spec/rack_servers/unicorn_spec.rb
@@ -0,0 +1,105 @@
+# frozen_string_literal: true
+
+require 'fileutils'
+
+require 'excon'
+
+require 'spec_helper'
+
+describe 'Unicorn' do
+  before(:all) do
+    project_root = File.expand_path('../..', __dir__)
+
+    config_lines = File.read('config/unicorn.rb.example')
+      .gsub('/home/git/gitlab', project_root)
+      .gsub('/home/git', project_root)
+      .split("\n")
+
+    # Remove these because they make setup harder.
+    config_lines = config_lines.reject do |line|
+      %w[
+        worker_processes
+        listen
+        pid
+        stderr_path
+        stdout_path
+      ].any? { |prefix| line.start_with?(prefix) }
+    end
+
+    config_lines << "working_directory '#{Rails.root}'"
+
+    # We want to have exactly 1 worker process because that makes it
+    # predictable which process will handle our requests.
+    config_lines << 'worker_processes 1'
+
+    @socket_path = File.join(project_root, 'tmp/tests/unicorn.socket')
+    config_lines << "listen '#{@socket_path}'"
+
+    ready_file = File.join(project_root, 'tmp/tests/unicorn-worker-ready')
+    FileUtils.rm_f(ready_file)
+    after_fork_index = config_lines.index { |l| l.start_with?('after_fork') }
+    config_lines.insert(after_fork_index + 1, "File.write('#{ready_file}', Process.pid)")
+
+    config_path = File.join(project_root, 'tmp/tests/unicorn.rb')
+    File.write(config_path, config_lines.join("\n") + "\n")
+
+    cmd = %W[unicorn -E test -c #{config_path} spec/rack_servers/configs/config.ru]
+    @unicorn_master_pid = spawn(*cmd)
+    wait_unicorn_boot!(@unicorn_master_pid, ready_file)
+    WebMock.allow_net_connect!
+  end
+
+  %w[SIGQUIT SIGTERM SIGKILL].each do |signal|
+    it "has a worker that self-terminates on signal #{signal}" do
+      response = Excon.get('unix://', socket: @socket_path)
+      expect(response.status).to eq(200)
+
+      worker_pid = response.body.to_i
+      expect(worker_pid).to be > 0
+
+      begin
+        Excon.post("unix://?#{signal}", socket: @socket_path)
+      rescue Excon::Error::Socket
+        # The connection may be closed abruptly
+      end
+
+      expect(pid_gone?(worker_pid)).to eq(true)
+    end
+  end
+
+  after(:all) do
+    WebMock.disable_net_connect!(allow_localhost: true)
+    Process.kill('TERM', @unicorn_master_pid)
+  end
+
+  def wait_unicorn_boot!(master_pid, ready_file)
+    # We have seen the boot timeout after 2 minutes in CI so let's set it to 5 minutes.
+    timeout = 5 * 60
+    timeout.times do
+      return if File.exist?(ready_file)
+
+      pid = Process.waitpid(master_pid, Process::WNOHANG)
+      raise "unicorn failed to boot: #{$?}" unless pid.nil?
+
+      sleep 1
+    end
+
+    raise "unicorn boot timed out after #{timeout} seconds"
+  end
+
+  def pid_gone?(pid)
+    # Worker termination should take less than a second. That makes 10
+    # seconds a generous timeout.
+    10.times do
+      begin
+        Process.kill(0, pid)
+      rescue Errno::ESRCH
+        return true
+      end
+
+      sleep 1
+    end
+
+    false
+  end
+end