Modified APIClient to not call nailgun during initialization

* changed error messages and help description
* modified APIClient to call nailgun only during requests
* modified the credential arguments to work correctly
* added tests

Change-Id: Ida542ac3c393b653331a38b06e12964dc9588abd
Closes-Bug: #1348395

fuelclient/fuelclient/cli/error.py

@@ -77,9 +77,16 @@ def handle_exceptions(exc):
             "({0})".format(error_body or "")
         ))
     elif isinstance(exc, urllib2.URLError):
-        exit_with_error("Can't connect to Nailgun server!")
+        exit_with_error("""
+        Can't connect to Nailgun server!
+        Please modify "SERVER_ADDRESS" and "LISTEN_PORT"
+        in the file /etc/fuel/client/config.yaml""")
     elif isinstance(exc, Unauthorized):
-        exit_with_error("Unauthorized: need authentication!")
+        exit_with_error("""
+        Unauthorized: need authentication!
+        Please provide user and password via client --os-username --os-password
+        or modify "KEYSTONE_USER" and "KEYSTONE_PASS" in
+        /etc/fuel/client/config.yaml""")
     elif isinstance(exc, FuelClientException):
         exit_with_error(exc.message)
     else:

fuelclient/fuelclient/cli/parser.py

@@ -32,7 +32,16 @@ class Parser:
     def __init__(self):
         self.args = sys.argv
         self.parser = argparse.ArgumentParser(
-            usage="fuel [optional args] <namespace> [action] [flags]"
+            usage="""
+            Configuration for client you can find in
+            /etc/fuel/client/config.yaml. If you don't have this file please
+            create it i.e.:
+            "SERVER_ADDRESS": "127.0.0.1",
+            "LISTEN_PORT": "8000",
+            "KEYSTONE_USER": "admin",
+            "KEYSTONE_PASS": "admin"
+
+            fuel [optional args] <namespace> [action] [flags]"""
         )
         self.universal_flags = []
         self.subparsers = self.parser.add_subparsers(

fuelclient/fuelclient/client.py

@@ -57,32 +57,32 @@ class Client(object):
         )
         self.api_root = self.root + "/api/v1/"
         self.ostf_root = self.root + "/ostf/"
-        self.auth_status()
         self.user = defaults["KEYSTONE_USER"]
         self.password = defaults["KEYSTONE_PASS"]
-        self.keystone_client = None
-        self.initialize_keystone_client()
+        self._keystone_client = None
+        self._auth_required = None
 
     @property
     def auth_token(self):
-        if self.keystone_client:
+        if self.auth_required:
             if not self.keystone_client.auth_token:
                 self.keystone_client.authenticate()
             return self.keystone_client.auth_token
         return ''
 
     @property
-    def user_id(self):
-        if self.keystone_client and not self.keystone_client.auth_token:
-            self.keystone_client.authenticate()
-            return self.keystone_client.user_id
-        return ''
-
-    def auth_status(self):
-        self.auth_required = False
+    def auth_required(self):
+        if self._auth_required is None:
             request = urllib2.urlopen(''.join([self.api_root, 'version']))
-        self.auth_required = json.loads(
+            self._auth_required = json.loads(
                 request.read()).get('auth_required', False)
+        return self._auth_required
+
+    @property
+    def keystone_client(self):
+        if not self._keystone_client:
+            self.initialize_keystone_client()
+        return self._keystone_client
 
     def update_own_password(self, new_pass):
         if self.auth_token:
@@ -91,12 +91,13 @@ class Client(object):
 
     def initialize_keystone_client(self):
         if self.auth_required:
-            self.keystone_client = auth_client.Client(
+            self._keystone_client = auth_client.Client(
                 username=self.user,
                 password=self.password,
                 auth_url=self.keystone_base,
                 tenant_name="admin")
-            self.keystone_client.session.auth = self.keystone_client
+            self._keystone_client.session.auth = self._keystone_client
+            self._keystone_client.authenticate()
 
     def debug_mode(self, debug=False):
         self.debug = debug

fuelclient/tests/test_client.py

@@ -93,6 +93,21 @@ class TestHandlers(BaseTestCase):
                 msg
             )
 
+    def test_check_wrong_server(self):
+        os.environ["SERVER_ADDRESS"] = "0"
+        result = self.run_cli_command("-h", check_errors=True)
+        self.assertEqual(result.stderr, '')
+        del os.environ["SERVER_ADDRESS"]
+
+    def test_wrong_credentials(self):
+        result = self.run_cli_command("--os-username=a --os-password=a node",
+                                      check_errors=True)
+        self.assertEqual(result.stderr,
+        '\n        Unauthorized: need authentication!\n'
+        '        Please provide user and password via client --os-username '
+        '--os-password\n        or modify "KEYSTONE_USER" and "KEYSTONE_PASS" '
+        'in\n        /etc/fuel/client/config.yaml\n')
+
     def test_destroy_node(self):
         self.load_data_to_nailgun_server()
         self.run_cli_commands((