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+# ============LICENSE_START=======================================================
+# org.onap.dcae
+# ================================================================================
+# Copyright (c) 2017 AT&T Intellectual Property. All rights reserved.
+# ================================================================================
+# 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.
+# ============LICENSE_END=========================================================
+#
+# ECOMP is a trademark and service mark of AT&T Intellectual Property.
+
+# -*- coding: utf-8 -*-
+"""
+Provides reusable utilites
+"""
+import os
+import json
+import sys
+import errno
+import contextlib
+import requests
+
+import six
+import click
+
+from dcae_cli.util.exc import DcaeException, FileNotFoundError
+
+
+APP_NAME = 'dcae-cli'
+
+
+def get_app_dir():
+ '''Returns the absolute directory path for dcae cli aux files'''
+ return click.get_app_dir(APP_NAME)
+
+
+def makedirs(path, exist_ok=True):
+ '''Emulates Python 3.2+ os.makedirs functionality'''
+ try:
+ os.makedirs(path, exist_ok=exist_ok)
+ except TypeError:
+ try:
+ os.makedirs(path)
+ except OSError as e:
+ if e.errno == errno.EEXIST and not exist_ok:
+ raise
+
+
+def get_pref(path, init_func=None):
+ '''Returns a general preference dict. Uses `init_func` to create a new one if the file does not exist.'''
+ try:
+ with open(path) as file:
+ pref = json.load(file)
+ except FileNotFoundError:
+ pref = init_func() if init_func is not None else dict()
+ write_pref(pref, path)
+ return pref
+
+
+def pref_exists(path):
+ return os.path.isfile(path)
+
+
+def update_pref(path, init_func=None, **kwargs):
+ '''Sets specified key-value pairs in a preference file and returns an updated dict'''
+ pref = get_pref(path, init_func)
+ pref.update(kwargs)
+ write_pref(pref, path)
+
+ return pref
+
+
+def write_pref(pref, path):
+ '''Writes a preference json file to disk'''
+ makedirs(os.path.dirname(path), exist_ok=True)
+ with open(path, 'w') as file:
+ json.dump(pref, file)
+
+
+def reraise_with_msg(e, msg=None, cls=None, as_dcae=False):
+ '''Reraises exception e with an additional message prepended'''
+ if as_dcae:
+ cls = DcaeException
+ traceback = sys.exc_info()[2]
+ cls = e.__class__ if cls is None else cls
+ new_msg = "{:}: {:}".format(msg, e) if msg else str(e)
+ new_e = cls(new_msg)
+ six.reraise(cls, new_e, traceback)
+
+
+def load_json(path):
+ '''Helper function which loads a JSON file and returns a dict'''
+ with open(path) as file:
+ try:
+ return json.load(file)
+ except ValueError:
+ raise DcaeException("File '{}' appears to be a malformed JSON.".format(path))
+
+
+def fetch_file_from_web(server_url, path, transform_func=json.loads):
+ """Fetch file from a web server
+
+ The default behavior is to transform the response to a json.
+ """
+ artifact_url = "{0}/{1}".format(server_url, path)
+ r = requests.get(artifact_url)
+ r.raise_for_status()
+ if transform_func:
+ return transform_func(r.text)
+ else:
+ return r.text