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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
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