load pulpcore db configuration by asking django, not by parsing python

definitions/features/pulpcore_database.rb

@@ -26,18 +26,21 @@ def services
 
   private
 
-  # rubocop:disable Metrics/AbcSize
   def load_configuration
-    full_config = File.read(PULPCORE_DB_CONFIG).split(/[\s,'":]/).reject(&:empty?)
+    python_command = <<~PYTHON.strip
+      from django.conf import settings; import json; print(json.dumps(settings.DATABASES["default"]))
+    PYTHON
+    manager_command = pulpcore_manager("shell --command '#{python_command}'")
+    manager_result = execute!(manager_command)
+    db_config = JSON.parse(manager_result)
 
     @configuration = {}
     @configuration['adapter'] = 'postgresql'
-    @configuration['host'] = full_config[full_config.index('HOST') + 1]
-    @configuration['port'] = full_config[full_config.index('PORT') + 1]
-    @configuration['database'] = full_config[full_config.index('NAME') + 1]
-    @configuration['username'] = full_config[full_config.index('USER') + 1]
-    @configuration['password'] = full_config[full_config.index('PASSWORD') + 1]
+    @configuration['host'] = db_config['HOST']
+    @configuration['port'] = db_config['PORT']
+    @configuration['database'] = db_config['NAME']
+    @configuration['username'] = db_config['USER']
+    @configuration['password'] = db_config['PASSWORD']
     @configuration
   end
-  # rubocop:enable Metrics/AbcSize
 end

test/definitions/features/pulpcore_database_test.rb

@@ -0,0 +1,22 @@
+require 'test_helper'
+
+describe Features::PulpcoreDatabase do
+  include DefinitionsTestHelper
+
+  subject { Features::PulpcoreDatabase.new }
+
+  describe '.configuration' do
+    it 'returns hash with DB config' do
+      expected_command = <<~CMD.strip
+        PULP_SETTINGS=/etc/pulp/settings.py runuser -u pulp -- pulpcore-manager shell --command 'from django.conf import settings; import json; print(json.dumps(settings.DATABASES["default"]))'
+      CMD
+      manager_return = <<~JSON
+        {"ENGINE": "django.db.backends.postgresql", "NAME": "pulpcore", "USER": "pulp", "PASSWORD": "password", "HOST": "remotedb", "PORT": "5432"}
+      JSON
+      subject.expects(:execute!).with(expected_command).returns(manager_return)
+      expected = { "adapter" => "postgresql", "host" => "remotedb", "port" => "5432",
+                   "database" => "pulpcore", "username" => "pulp", "password" => "password" }
+      assert_equal expected, subject.configuration
+    end
+  end
+end