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# Copyright (c) 2018 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.
import smtplib
import logging
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from os.path import isdir
from errors import PresentationError
class AlertingError(PresentationError):
"""Exception(s) raised by the alerting module.
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).
"""
def __init__(self, msg, details='', level="CRITICAL"):
"""Sets the exception message and the level.
:param msg: Short description of the encountered problem.
:param details: Relevant messages if there are any collected, e.g.,
from caught exception (optional parameter details), or relevant data
if there are any collected (optional parameter details).
:param level: Level of the error, possible choices are: "DEBUG", "INFO",
"WARNING", "ERROR" and "CRITICAL".
:type msg: str
:type details: str
:type level: str
"""
super(AlertingError, self).__init__(
"Alerting: {0}".format(msg), details, level)
def __repr__(self):
return (
"AlertingError(msg={msg!r},details={dets!r},level={level!r})".
format(msg=self._msg, dets=self._details, level=self._level))
class Alerting(object):
"""Class implementing the alerting mechanism.
"""
def __init__(self, spec):
"""Initialization.
:param spec: The CPTA specification.
:type spec: Specification
"""
# Implemented alerts:
self._ALERTS = ("failed-tests", )
self._spec = spec.alerting
self._path_failed_tests = spec.environment["paths"]["DIR[STATIC,VPP]"]
# Verify and validate input specification:
self.configs = self._spec.get("configurations", None)
if not self.configs:
raise AlertingError("No alert configuration is specified.")
for config_type, config_data in self.configs.iteritems():
if config_type == "email":
if not config_data.get("server", None):
raise AlertingError("Parameter 'server' is missing.")
if not config_data.get("address-to", None):
raise AlertingError("Parameter 'address-to' (recipient) is "
"missing.")
if not config_data.get("address-from", None):
raise AlertingError("Parameter 'address-from' (sender) is "
"missing.")
elif config_type == "jenkins":
if not isdir(config_data.get("output-dir", "")):
raise AlertingError("Parameter 'output-dir' is "
"missing or it is not a directory.")
if not config_data.get("output-file", None):
raise AlertingError("Parameter 'output-file' is missing.")
else:
raise AlertingError("Alert of type '{0}' is not implemented.".
format(config_type))
self.alerts = self._spec.get("alerts", None)
if not self.alerts:
raise AlertingError("No alert is specified.")
for alert, alert_data in self.alerts.iteritems():
if not alert_data.get("title", None):
raise AlertingError("Parameter 'title' is missing.")
if not alert_data.get("type", None) in self._ALERTS:
raise AlertingError("Parameter 'failed-tests' is missing or "
"incorrect.")
if not alert_data.get("way", None) in self.configs.keys():
raise AlertingError("Parameter 'way' is missing or incorrect.")
if not alert_data.get("include", None):
raise AlertingError("Parameter 'include' is missing or the "
"list is empty.")
def __str__(self):
"""Return string with human readable description of the alert.
:returns: Readable description.
:rtype: str
"""
return "configs={configs}, alerts={alerts}".format(
configs=self.configs, alerts=self.alerts)
def __repr__(self):
"""Return string executable as Python constructor call.
:returns: Executable constructor call.
:rtype: str
"""
return "Alerting(spec={spec})".format(
spec=self._spec)
def generate_alerts(self):
"""Generate alert(s) using specified way(s).
"""
for alert, alert_data in self.alerts.iteritems():
if alert_data["way"] == "email":
text, html = self._create_alert_message(alert_data)
conf = self.configs["email"]
self._send_email(server=conf["server"],
addr_from=conf["address-from"],
addr_to=conf["address-to"],
subject=alert_data["title"],
text=text,
html=html)
elif alert_data["way"] == "jenkins":
self._generate_files_for_jenkins(alert_data)
else:
raise AlertingError("Alert with way '{0}' is not implemented.".
format(alert_data["way"]))
@staticmethod
def _send_email(server, addr_from, addr_to, subject, text=None, html=None):
"""Send an email using predefined configuration.
:param server: SMTP server used to send email.
:param addr_from: Sender address.
:param addr_to: Recipient address(es).
:param subject: Subject of the email.
:param text: Message in the ASCII text format.
:param html: Message in the HTML format.
:type server: str
:type addr_from: str
:type addr_to: list
:type subject: str
:type text: str
:type html: str
"""
if not text and not html:
raise AlertingError("No text/data to send.")
msg = MIMEMultipart('alternative')
msg['Subject'] = subject
msg['From'] = addr_from
msg['To'] = ", ".join(addr_to)
if text:
msg.attach(MIMEText(text, 'plain'))
if html:
msg.attach(MIMEText(html, 'html'))
smtp_server = None
try:
logging.info("Trying to send alert '{0}' ...".format(subject))
logging.debug("SMTP Server: {0}".format(server))
logging.debug("From: {0}".format(addr_from))
logging.debug("To: {0}".format(", ".join(addr_to)))
logging.debug("Message: {0}".format(msg.as_string()))
smtp_server = smtplib.SMTP(server)
smtp_server.sendmail(addr_from, addr_to, msg.as_string())
except smtplib.SMTPException as err:
raise AlertingError("Not possible to send the alert via email.",
str(err))
finally:
if smtp_server:
smtp_server.quit()
def _create_alert_message(self, alert):
"""Create the message which is used in the generated alert.
:param alert: Message is created for this alert.
:type alert: dict
:returns: Message in the ASCII text and HTML format.
:rtype: tuple(str, str)
"""
if alert["type"] == "failed-tests":
text = ""
html = "<html><body>"
for item in alert["include"]:
file_name = "{path}/{name}".format(
path=self._path_failed_tests, name=item)
try:
with open("{0}.txt".format(file_name), 'r') as txt_file:
text += "{0}:\n\n".format(
item.replace("failed-tests-", ""))
text += txt_file.read() + "\n" * 2
except IOError:
logging.error("Not possible to read the file '{0}.txt'.".
format(file_name))
try:
with open("{0}.rst".format(file_name), 'r') as rst_file:
html += "<h2>{0}:</h2>".format(
item.replace("failed-tests-", ""))
html += rst_file.readlines()[2].\
replace("../trending", alert.get("url", ""))
html += "<br>" * 3
except IOError:
logging.error("Not possible to read the file '{0}.rst'.".
format(file_name))
html += "</body></html>"
else:
raise AlertingError("Alert of type '{0}' is not implemented.".
format(alert["type"]))
return text, html
def _generate_files_for_jenkins(self, alert):
"""Create the file which is used in the generated alert.
:param alert: Files are created for this alert.
:type alert: dict
"""
config = self.configs[alert["way"]]
if alert["type"] == "failed-tests":
text, html = self._create_alert_message(alert)
file_name = "{0}/{1}".format(config["output-dir"],
config["output-file"])
logging.info("Writing the file '{0}.txt' ...".format(file_name))
try:
with open("{0}.txt".format(file_name), 'w') as txt_file:
txt_file.write(text)
except IOError:
logging.error("Not possible to write the file '{0}.txt'.".
format(file_name))
logging.info("Writing the file '{0}.html' ...".format(file_name))
try:
with open("{0}.html".format(file_name), 'w') as html_file:
html_file.write(html)
except IOError:
logging.error("Not possible to write the file '{0}.html'.".
format(file_name))
else:
raise AlertingError("Alert of type '{0}' is not implemented.".
format(alert["type"]))
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