mirror of
https://github.com/weewx/weewx.git
synced 2026-04-19 00:56:54 -04:00
221 lines
8.4 KiB
Python
221 lines
8.4 KiB
Python
# Copyright (c) 2009-2015 Tom Keffer <tkeffer@gmail.com>
|
|
# See the file LICENSE.txt for your rights.
|
|
|
|
"""Example of how to implement an alarm in weewx.
|
|
|
|
*******************************************************************************
|
|
|
|
To use this alarm, add the following to the weewx configuration file:
|
|
|
|
[Alarm]
|
|
expression = "outTemp < 40.0"
|
|
time_wait = 3600
|
|
smtp_host = smtp.example.com
|
|
smtp_user = myusername
|
|
smtp_password = mypassword
|
|
from = sally@example.com
|
|
mailto = jane@example.com, bob@example.com
|
|
subject = "Alarm message from weewx!"
|
|
|
|
In this example, if the outside temperature falls below 40, it will send an
|
|
email to the users specified in the comma separated list specified in option
|
|
"mailto", in this case:
|
|
|
|
jane@example.com, bob@example.com
|
|
|
|
The example assumes an SMTP email server at smtp.example.com that requires
|
|
login. If the SMTP server does not require login, leave out the lines for
|
|
smtp_user and smtp_password.
|
|
|
|
Setting an email "from" is optional. If not supplied, one will be filled in,
|
|
but your SMTP server may or may not accept it.
|
|
|
|
Setting an email "subject" is optional. If not supplied, one will be filled in.
|
|
|
|
To avoid a flood of emails, one will only be sent every 3600 seconds (one
|
|
hour).
|
|
|
|
*******************************************************************************
|
|
|
|
To enable this service:
|
|
|
|
1) copy this file to the user directory
|
|
|
|
2) modify the weewx configuration file by adding this service to the option
|
|
"report_services", located in section [Engine][[Services]].
|
|
|
|
[Engine]
|
|
[[Services]]
|
|
...
|
|
report_services = weewx.engine.StdPrint, weewx.engine.StdReport, user.alarm.MyAlarm
|
|
|
|
*******************************************************************************
|
|
|
|
If you wish to use both this example and the lowBattery.py example, simply
|
|
merge the two configuration options together under [Alarm] and add both
|
|
services to report_services.
|
|
|
|
*******************************************************************************
|
|
"""
|
|
|
|
import time
|
|
import smtplib
|
|
from email.mime.text import MIMEText
|
|
import threading
|
|
import syslog
|
|
|
|
import weewx
|
|
from weewx.engine import StdService
|
|
from weeutil.weeutil import timestamp_to_string, option_as_list
|
|
|
|
# Inherit from the base class StdService:
|
|
class MyAlarm(StdService):
|
|
"""Service that sends email if an arbitrary expression evaluates true"""
|
|
|
|
def __init__(self, engine, config_dict):
|
|
# Pass the initialization information on to my superclass:
|
|
super(MyAlarm, self).__init__(engine, config_dict)
|
|
|
|
# This will hold the time when the last alarm message went out:
|
|
self.last_msg_ts = 0
|
|
|
|
try:
|
|
# Dig the needed options out of the configuration dictionary.
|
|
# If a critical option is missing, an exception will be raised and
|
|
# the alarm will not be set.
|
|
self.expression = config_dict['Alarm']['expression']
|
|
self.time_wait = int(config_dict['Alarm'].get('time_wait', 3600))
|
|
self.smtp_host = config_dict['Alarm']['smtp_host']
|
|
self.smtp_user = config_dict['Alarm'].get('smtp_user')
|
|
self.smtp_password = config_dict['Alarm'].get('smtp_password')
|
|
self.SUBJECT = config_dict['Alarm'].get('subject', "Alarm message from weewx")
|
|
self.FROM = config_dict['Alarm'].get('from', 'alarm@example.com')
|
|
self.TO = option_as_list(config_dict['Alarm']['mailto'])
|
|
syslog.syslog(syslog.LOG_INFO, "alarm: Alarm set for expression: '%s'" % self.expression)
|
|
|
|
# If we got this far, it's ok to start intercepting events:
|
|
self.bind(weewx.NEW_ARCHIVE_RECORD, self.newArchiveRecord) # NOTE 1
|
|
except KeyError, e:
|
|
syslog.syslog(syslog.LOG_INFO, "alarm: No alarm set. Missing parameter: %s" % e)
|
|
|
|
def newArchiveRecord(self, event):
|
|
"""Gets called on a new archive record event."""
|
|
|
|
# To avoid a flood of nearly identical emails, this will do
|
|
# the check only if we have never sent an email, or if we haven't
|
|
# sent one in the last self.time_wait seconds:
|
|
if not self.last_msg_ts or abs(time.time() - self.last_msg_ts) >= self.time_wait :
|
|
# Get the new archive record:
|
|
record = event.record
|
|
|
|
# Be prepared to catch an exception in the case that the expression contains
|
|
# a variable that is not in the record:
|
|
try: # NOTE 2
|
|
# Evaluate the expression in the context of the event archive record.
|
|
# Sound the alarm if it evaluates true:
|
|
if eval(self.expression, None, record): # NOTE 3
|
|
# Sound the alarm!
|
|
# Launch in a separate thread so it doesn't block the main LOOP thread:
|
|
t = threading.Thread(target = MyAlarm.soundTheAlarm, args=(self, record))
|
|
t.start()
|
|
# Record when the message went out:
|
|
self.last_msg_ts = time.time()
|
|
except NameError, e:
|
|
# The record was missing a named variable. Write a debug message, then keep going
|
|
syslog.syslog(syslog.LOG_DEBUG, "alarm: %s" % e)
|
|
|
|
def soundTheAlarm(self, rec):
|
|
"""This function is called when the given expression evaluates True."""
|
|
|
|
# Get the time and convert to a string:
|
|
t_str = timestamp_to_string(rec['dateTime'])
|
|
|
|
# Log it
|
|
syslog.syslog(syslog.LOG_INFO, "alarm: Alarm expression \"%s\" evaluated True at %s" % (self.expression, t_str))
|
|
|
|
# Form the message text:
|
|
msg_text = "Alarm expression \"%s\" evaluated True at %s\nRecord:\n%s" % (self.expression, t_str, str(rec))
|
|
# Convert to MIME:
|
|
msg = MIMEText(msg_text)
|
|
|
|
# Fill in MIME headers:
|
|
msg['Subject'] = self.SUBJECT
|
|
msg['From'] = self.FROM
|
|
msg['To'] = ','.join(self.TO)
|
|
|
|
# Create an instance of class SMTP for the given SMTP host:
|
|
s = smtplib.SMTP(self.smtp_host)
|
|
try:
|
|
# Some servers (eg, gmail) require encrypted transport.
|
|
# Be prepared to catch an exception if the server
|
|
# doesn't support it.
|
|
s.ehlo()
|
|
s.starttls()
|
|
s.ehlo()
|
|
syslog.syslog(syslog.LOG_DEBUG, "alarm: using encrypted transport")
|
|
except smtplib.SMTPException:
|
|
syslog.syslog(syslog.LOG_DEBUG, "alarm: using unencrypted transport")
|
|
|
|
try:
|
|
# If a username has been given, assume that login is required for this host:
|
|
if self.smtp_user:
|
|
s.login(self.smtp_user, self.smtp_password)
|
|
syslog.syslog(syslog.LOG_DEBUG, "alarm: logged in with user name %s" % (self.smtp_user,))
|
|
|
|
# Send the email:
|
|
s.sendmail(msg['From'], self.TO, msg.as_string())
|
|
# Log out of the server:
|
|
s.quit()
|
|
except Exception, e:
|
|
syslog.syslog(syslog.LOG_ERR, "alarm: SMTP mailer refused message with error %s" % (e,))
|
|
raise
|
|
|
|
# Log sending the email:
|
|
syslog.syslog(syslog.LOG_INFO, "alarm: email sent to: %s" % self.TO)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
"""This section is used for testing the code. """
|
|
import sys
|
|
import configobj
|
|
from optparse import OptionParser
|
|
|
|
usage_string ="""Usage:
|
|
|
|
alarm.py config_path
|
|
|
|
Arguments:
|
|
|
|
config_path: Path to weewx.conf"""
|
|
parser = OptionParser(usage=usage_string)
|
|
(options, args) = parser.parse_args()
|
|
|
|
if len(args) < 1:
|
|
sys.stderr.write("Missing argument(s).\n")
|
|
sys.stderr.write(parser.parse_args(["--help"]))
|
|
exit()
|
|
|
|
config_path = args[0]
|
|
|
|
weewx.debug = 1
|
|
|
|
try :
|
|
config_dict = configobj.ConfigObj(config_path, file_error=True)
|
|
except IOError:
|
|
print "Unable to open configuration file ", config_path
|
|
exit()
|
|
|
|
if 'Alarm' not in config_dict:
|
|
print >>sys.stderr, "No [Alarm] section in the configuration file %s" % config_path
|
|
exit(1)
|
|
|
|
engine = None
|
|
alarm = MyAlarm(engine, config_dict)
|
|
|
|
rec = {'extraTemp1': 1.0,
|
|
'outTemp' : 38.2,
|
|
'dateTime' : int(time.time())}
|
|
|
|
event = weewx.Event(weewx.NEW_ARCHIVE_RECORD, record=rec)
|
|
alarm.newArchiveRecord(event)
|