Use alpine python and gunicorn

Adding docker_settings.py which reads environment variables
to allows for environment variable to be passed to the
container

test/test_docker_settings.py

@@ -0,0 +1,92 @@
+import os
+from puppetboard import docker_settings
+import unittest
+import tempfile
+try:
+    import future.utils
+except:
+    pass
+
+try:
+    from imp import reload as reload
+except:
+    pass
+
+
+class DockerTestCase(unittest.TestCase):
+    def setUp(self):
+        for env_var in dir(docker_settings):
+            if (env_var.startswith('__') or env_var.startswith('_') or
+                    env_var.islower()):
+                continue
+
+            if env_var in os.environ:
+                del os.environ[env_var]
+        reload(docker_settings)
+
+    def test_default_host_port(self):
+        self.assertEqual(docker_settings.PUPPETDB_HOST, 'localhost')
+        self.assertEqual(docker_settings.PUPPETDB_PORT, 8080)
+
+    def test_set_host_port(self):
+        os.environ['PUPPETDB_HOST'] = 'puppetdb'
+        os.environ['PUPPETDB_PORT'] = '9081'
+        reload(docker_settings)
+        self.assertEqual(docker_settings.PUPPETDB_HOST, 'puppetdb')
+        self.assertEqual(docker_settings.PUPPETDB_PORT, 9081)
+
+    def test_cert_true_test(self):
+        os.environ['PUPPETDB_SSL_VERIFY'] = 'True'
+        reload(docker_settings)
+        self.assertTrue(docker_settings.PUPPETDB_SSL_VERIFY)
+        os.environ['PUPPETDB_SSL_VERIFY'] = 'true'
+        reload(docker_settings)
+        self.assertTrue(docker_settings.PUPPETDB_SSL_VERIFY)
+
+    def test_cert_false_test(self):
+        os.environ['PUPPETDB_SSL_VERIFY'] = 'False'
+        reload(docker_settings)
+        self.assertFalse(docker_settings.PUPPETDB_SSL_VERIFY)
+        os.environ['PUPPETDB_SSL_VERIFY'] = 'false'
+        reload(docker_settings)
+        self.assertFalse(docker_settings.PUPPETDB_SSL_VERIFY)
+
+    def test_cert_path(self):
+        ca_file = '/usr/ssl/path/ca.pem'
+        os.environ['PUPPETDB_SSL_VERIFY'] = ca_file
+        reload(docker_settings)
+        self.assertEqual(docker_settings.PUPPETDB_SSL_VERIFY, ca_file)
+
+    def validate_facts(self, facts):
+        self.assertEqual(type(facts), type([]))
+        self.assertTrue(len(facts) > 0)
+        for map in facts:
+            self.assertEqual(type(map), type(()))
+            self.assertTrue(len(map) == 2)
+
+    def test_inventory_facts_default(self):
+        self.validate_facts(docker_settings.INVENTORY_FACTS)
+
+    def test_invtory_facts_custom(self):
+        os.environ['INVENTORY_FACTS'] = "A, B, C, D"
+        reload(docker_settings)
+        self.validate_facts(docker_settings.INVENTORY_FACTS)
+
+    def test_graph_facts_defautl(self):
+        facts = docker_settings.GRAPH_FACTS
+        self.assertEqual(type(facts), type([]))
+        self.assertTrue('puppetversion' in facts)
+
+    def test_graph_facts_custom(self):
+        os.environ['GRAPH_FACTS'] = "architecture, puppetversion, extra"
+        reload(docker_settings)
+        facts = docker_settings.GRAPH_FACTS
+        self.assertEqual(type(facts), type([]))
+        self.assertEqual(len(facts), 3)
+        self.assertTrue('puppetversion' in facts)
+        self.assertTrue('architecture' in facts)
+        self.assertTrue('extra' in facts)
+
+
+if __name__ == '__main__':
+    unittest.main()