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# Copyright (c) 2016 Cisco and/or its affiliates.
# 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.
"""Implementation of low level functionality used in communication with
Honeycomb.
Exception HoneycombError is used in all methods and in all modules with
Honeycomb keywords.
Class HoneycombUtil implements methods used by Honeycomb keywords. They must not
be used directly in tests. Use keywords implemented in the module
HoneycombAPIKeywords instead.
"""
from json import loads
from robot.api import logger
from resources.libraries.python.HTTPRequest import HTTPRequest
from resources.libraries.python.constants import Constants as Const
class HoneycombError(Exception):
"""Exception(s) raised by methods working with Honeycomb.
When raising this exception, put this information to the message in this
order:
- short description of the encountered problem (parameter msg),
- relevant messages if there are any collected, e.g., from caught
exception (optional parameter details),
- relevant data if there are any collected (optional parameter details).
The logging is performed on two levels: 1. error - short description of the
problem; 2. debug - detailed information.
"""
def __init__(self, msg, details='', enable_logging=True):
"""Sets the exception message and enables / disables logging.
It is not wanted to log errors when using these keywords together
with keywords like "Wait until keyword succeeds". So you can disable
logging by setting enable_logging to False.
:param msg: Message to be displayed and logged
:param enable_logging: When True, logging is enabled, otherwise
logging is disabled.
:type msg: str
:type enable_logging: bool
"""
super(HoneycombError, self).__init__()
self._msg = "{0}: {1}".format(self.__class__.__name__, msg)
self._details = details
if enable_logging:
logger.error(self._msg)
logger.debug(self._details)
def __repr__(self):
return repr(self._msg)
def __str__(self):
return str(self._msg)
class HoneycombUtil(object):
"""Implements low level functionality used in communication with Honeycomb.
There are implemented methods to get, put and delete data to/from Honeycomb.
They are based on functionality implemented in the module HTTPRequests which
uses HTTP requests GET, PUT, POST and DELETE to communicate with Honeycomb.
It is possible to PUT the data represented as XML or JSON structures or as
plain text.
Data received in the response of GET are always represented as a JSON
structure.
There are also two supportive methods implemented:
- read_path_from_url_file which reads URL file and returns a path (see
docs/honeycomb_url_files.rst).
- parse_json_response which parses data from response in JSON representation
according to given path.
"""
def __init__(self):
pass
@staticmethod
def read_path_from_url_file(url_file):
"""Read path from *.url file.
For more information about *.url file see docs/honeycomb_url_files.rst
:param url_file: URL file. The argument contains only the name of file
without extension, not the full path.
:type url_file: str
:return: Requested path.
:rtype: str
"""
url_file = "{0}/{1}.url".format(Const.RESOURCES_TPL_HC, url_file)
with open(url_file) as template:
path = template.readline()
return path
@staticmethod
def parse_json_response(response, path=None):
"""Parse data from response string in JSON format according to given
path.
:param response: JSON formatted string.
:param path: Path to navigate down the data structure.
:type response: string
:type path: tuple
:return: JSON dictionary/list tree.
:rtype: list
"""
data = loads(response)
if path:
data = HoneycombUtil._parse_json_tree(data, path)
if not isinstance(data, list):
data = [data, ]
return data
@staticmethod
def _parse_json_tree(data, path):
"""Retrieve data addressed by path from python representation of JSON
object.
:param data: Parsed JSON dictionary tree.
:param path: Path to navigate down the dictionary tree.
:type data: dict
:type path: tuple
:return: Data from specified path.
:rtype: list, dict or str
"""
count = 0
for key in path:
if isinstance(data, dict):
data = data[key]
count += 1
elif isinstance(data, list):
result = []
for item in data:
result.append(HoneycombUtil._parse_json_tree(item,
path[count:]))
return result
return data
@staticmethod
def get_honeycomb_data(node, url_file):
"""Retrieve data from Honeycomb according to given URL.
:param node: Honeycomb node.
:param url_file: URL file. The argument contains only the name of file
without extension, not the full path.
:type node: dict
:type url_file: str
:return: Requested information.
:rtype list
"""
path = HoneycombUtil.read_path_from_url_file(url_file)
status_code, resp = HTTPRequest.get(node, path)
return status_code, resp
@staticmethod
def put_honeycomb_data(node, url_file, data, data_representation='json'):
"""Send configuration data using PUT request and return the status code
and response.
:param node: Honeycomb node.
:param url_file: URL file. The argument contains only the name of file
without extension, not the full path.
:param data: Configuration data to be sent to Honeycomb.
:param data_representation: How the data is represented. Supported types
of representation are: json, xml and txt.
:type node: dict
:type url_file: str
:type data: str
:type data_representation: str
:return: Status code and content of response.
:rtype: tuple
"""
headers = {'json':
{"Content-Type": "application/json",
'Accept': 'text/plain'},
'xml':
{"Content-Type": "application/xml",
'Accept': 'text/plain'},
'txt':
{"Content-Type": "text/plain",
'Accept': 'text/plain'}
}
try:
header = headers[data_representation]
except KeyError as err:
raise HoneycombError("Wrong data type: {0}.".
format(data_representation), repr(err))
path = HoneycombUtil.read_path_from_url_file(url_file)
status_code, resp = HTTPRequest.put(node=node, path=path,
headers=header, payload=data)
return status_code, resp
@staticmethod
def delete_honeycomb_data(node, url_file):
"""Delete data from Honeycomb according to given URL.
:param node: Honeycomb node.
:param url_file: URL file. The argument contains only the name of file
without extension, not the full path.
:type node: dict
:type url_file: str
:return: Status code and response.
:rtype tuple
"""
path = HoneycombUtil.read_path_from_url_file(url_file)
return HTTPRequest.delete(node, path)
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