adding check for str/unicode type in requires

When the requires argument for an Atom is passed in as a string,
each character of the string is iterated over to build up a
requirement list.  This works for simple one letter argument
names but not for long argument names.

Added check for str and unicode types to prevent iterating over a
string.

Change-Id: Ida584221b48966d26935fb2ede0075aabb7ce972

4 files changed, 21 insertions, 2 deletions

diff --git a/taskflow/atom.py b/taskflow/atom.py
index 1c5e61e..82f7a5e 100644
--- a/taskflow/atom.py
+++ b/taskflow/atom.py
@@ -100,7 +100,10 @@ def _build_arg_mapping(atom_name, reqs, rebind_args, function, do_infer,
     required = {}
     # add reqs to required mappings
     if reqs:
-        required.update((a, a) for a in reqs)
+        if isinstance(reqs, six.string_types):
+            required.update({reqs: reqs})
+        else:
+            required.update((a, a) for a in reqs)
 
     # add req_args to required mappings if do_infer is set
     if do_infer:
diff --git a/taskflow/tests/unit/test_arguments_passing.py b/taskflow/tests/unit/test_arguments_passing.py
index fb4744b..c84d853 100644
--- a/taskflow/tests/unit/test_arguments_passing.py
+++ b/taskflow/tests/unit/test_arguments_passing.py
@@ -149,6 +149,16 @@ class ArgumentsPassingTest(utils.EngineTestBase):
                           utils.TaskOneArg,
                           rebind=object())
 
+    def test_long_arg_name(self):
+        flow = utils.LongArgNameTask(requires='long_arg_name',
+                                     provides='result')
+        engine = self._make_engine(flow)
+        engine.storage.inject({'long_arg_name': 1})
+        engine.run()
+        self.assertEqual(engine.storage.fetch_all(), {
+            'long_arg_name': 1, 'result': 1
+        })
+
 
 class SingleThreadedEngineTest(ArgumentsPassingTest,
                                test.TestCase):
diff --git a/taskflow/tests/unit/worker_based/test_worker.py b/taskflow/tests/unit/worker_based/test_worker.py
index 7020a93..597a64a 100644
--- a/taskflow/tests/unit/worker_based/test_worker.py
+++ b/taskflow/tests/unit/worker_based/test_worker.py
@@ -34,7 +34,7 @@ class TestWorker(test.MockTestCase):
         self.exchange = 'test-exchange'
         self.topic = 'test-topic'
         self.threads_count = 5
-        self.endpoint_count = 22
+        self.endpoint_count = 23
 
         # patch classes
         self.executor_mock, self.executor_inst_mock = self.patchClass(
diff --git a/taskflow/tests/utils.py b/taskflow/tests/utils.py
index fbbb83c..9e6e2a3 100644
--- a/taskflow/tests/utils.py
+++ b/taskflow/tests/utils.py
@@ -95,6 +95,12 @@ class FakeTask(object):
         pass
 
 
+class LongArgNameTask(task.Task):
+
+    def execute(self, long_arg_name):
+        return long_arg_name
+
+
 if six.PY3:
     RUNTIME_ERROR_CLASSES = ['RuntimeError', 'Exception',
                              'BaseException', 'object']