simplify awxkit dependencies

- remove flake8 as an install requirements (it's only used for tests)
- vendor toposort, which is Apache 2.0 licensed (and very small)
- change websocket-client to a setuptools optional dependency, which you
  can install via:

  pip install "./awxkit[websockets]"

- add `jq` and `tabulate` under an additional optional setuptools
  dependency:

  pip install "./awxkit[formatting]"

- remove `cryptography`, which is only used for random RSA generation
  (unused by the CLI)

awxkit/awxkit/api/mixins/has_create.py

@@ -1,9 +1,8 @@
 from collections import defaultdict
 import inspect
 
-from toposort import toposort
-
 from awxkit.utils import get_class_if_instance, class_name_to_kw_arg, is_proper_subclass, super_dir_set
+from awxkit.utils.toposort import toposort
 
 
 # HasCreate dependency resolution and creation utilities

awxkit/awxkit/api/pages/credentials.py

@@ -1,10 +1,6 @@
 import logging
 
 
-from cryptography.hazmat.backends import default_backend
-from cryptography.hazmat.primitives import serialization
-from cryptography.hazmat.primitives.asymmetric import rsa
-
 from awxkit.utils import (
     cloud_types,
     filter_by_class,
@@ -47,6 +43,10 @@ credential_input_fields = (
 
 
 def generate_private_key():
+    from cryptography.hazmat.backends import default_backend
+    from cryptography.hazmat.primitives import serialization
+    from cryptography.hazmat.primitives.asymmetric import rsa
+
     key = rsa.generate_private_key(
         public_exponent=65537,
         key_size=4096,

awxkit/awxkit/utils/toposort.py

@@ -0,0 +1,82 @@
+#######################################################################
+# Implements a topological sort algorithm.
+#
+# Copyright 2014 True Blade Systems, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Notes:
+#  Based on http://code.activestate.com/recipes/578272-topological-sort
+#   with these major changes:
+#    Added unittests.
+#    Deleted doctests (maybe not the best idea in the world, but it cleans
+#     up the docstring).
+#    Moved functools import to the top of the file.
+#    Changed assert to a ValueError.
+#    Changed iter[items|keys] to [items|keys], for python 3
+#     compatibility. I don't think it matters for python 2 these are
+#     now lists instead of iterables.
+#    Copy the input so as to leave it unmodified.
+#    Renamed function from toposort2 to toposort.
+#    Handle empty input.
+#    Switch tests to use set literals.
+#
+########################################################################
+
+from functools import reduce as _reduce
+
+__all__ = ['toposort', 'CircularDependencyError']
+
+
+class CircularDependencyError(ValueError):
+    def __init__(self, data):
+        # Sort the data just to make the output consistent, for use in
+        #  error messages.  That's convenient for doctests.
+        s = 'Circular dependencies exist among these items: {{{}}}'.format(', '.join('{!r}:{!r}'.format(key, value) for key, value in sorted(data.items())))  # noqa
+        super(CircularDependencyError, self).__init__(s)
+        self.data = data
+
+
+def toposort(data):
+    """Dependencies are expressed as a dictionary whose keys are items
+and whose values are a set of dependent items. Output is a list of
+sets in topological order. The first set consists of items with no
+dependences, each subsequent set consists of items that depend upon
+items in the preceeding sets.
+"""
+
+    # Special case empty input.
+    if len(data) == 0:
+        return
+
+    # Copy the input so as to leave it unmodified.
+    data = data.copy()
+
+    # Ignore self dependencies.
+    for k, v in data.items():
+        v.discard(k)
+    # Find all items that don't depend on anything.
+    extra_items_in_deps = _reduce(set.union, data.values()) - set(data.keys())
+    # Add empty dependences where needed.
+    data.update({item: set() for item in extra_items_in_deps})
+    while True:
+        ordered = set(item for item, dep in data.items() if len(dep) == 0)
+        if not ordered:
+            break
+        yield ordered
+        data = {
+            item: (dep - ordered)
+            for item, dep in data.items() if item not in ordered
+        }
+    if len(data) != 0:
+        raise CircularDependencyError(data)

awxkit/awxkit/ws.py

@@ -7,8 +7,6 @@ import json
 import ssl
 import urllib.parse
 
-import websocket
-
 from awxkit.config import config
 
 
@@ -53,6 +51,9 @@ class WSClient(object):
     # Subscription group types
 
     def __init__(self, token=None, hostname='', port=443, secure=True, session_id=None, csrftoken=None):
+        # delay this import, because this is an optional dependency
+        import websocket
+
         if not hostname:
             result = urllib.parse.urlparse(config.base_url)
             secure = result.scheme == 'https'

awxkit/requirements.txt

@@ -1,8 +1,4 @@
 PyYAML>=5.1
-cryptography
-flake8
 python-dateutil
 requests
 termcolor
-toposort
-websocket-client>=0.54.0

awxkit/setup.py

@@ -68,6 +68,10 @@ setup(
     include_package_data=True,
     install_requires=requirements,
     python_requires=">= 3.5",
+    extras_require={
+        'formatting': ['jq', 'tabulate'],
+        'websockets': ['websocket-client>0.54.0'],
+    },
     entry_points={
         'console_scripts': [
             'akit=awxkit.scripts.basic_session:load_interactive',

awxkit/test/test_dependency_resolver.py

@@ -1,7 +1,7 @@
-from toposort import CircularDependencyError
 import pytest
 
 from awxkit.utils import filter_by_class
+from awxkit.utils.toposort import CircularDependencyError
 from awxkit.api.mixins import has_create
 
 

awxkit/tox.ini

@@ -12,6 +12,7 @@ passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH
 setenv =
     PYTHONPATH = {toxinidir}:{env:PYTHONPATH:}:.
 deps =
+    websocket-client
     coverage
     pytest
     pytest-mock