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#!/usr/bin/python

#

# Auto-start and stop EC2 instances

#

import boto.ec2, datetime, sys

from time import gmtime, strftime, strptime, sleep

#Default start stop times (7am / 7pm AWST)

DEFAULT_START_GMT = "23"

DEFAULT_STOP_GMT = "11"

#debug setting for dry-run

#IS_DRY_RUN = True

IS_DRY_RUN = False

###################################################################################

# Shoudn't need to modify anything below here

###################################################################################

#State Code Constants

#http://docs.aws.amazon.com/cli/latest/reference/ec2/describe-instance-status.html

STATE_PENDING = 0

STATE_RUNNING = 16

STATE_SHUTTING_DOWN = 32

STATE_TERMINATED = 48

STATE_STOPPING = 64

STATE_STOPPED = 80

# This is special flag to never kill this instance. Should really only be used

# on your scripting server instance.

TAG_DATE_TIME_FORMAT = "%Y-%m-%d"

DEFAULT_NO_BOOT_TIME = "2000-01-01"

DEFAULT_NO_KILL_TIME = "2000-01-01"

TODAY_HOUR_DT_FORMAT = '%Y-%m-%d %H'

DEFAULT_AUTO_TIME = '2000-01-01 00'

TODAY_WEEKDAY_NAME = '%a'

DEFAULT_WEEKDAY_ACTION = 'MTWHFSU'

def main():

    gmtime_now = gmtime()

    #Test cases

    #Monday

    #gmtime_now = strptime("2014/11/24 10:00:00", "%Y/%m/%d %H:%M:%S")

    #Wednesday

    #gmtime_now = strptime("2014/11/26 10:00:00", "%Y/%m/%d %H:%M:%S")

    #Thursday

    #gmtime_now = strptime("2014/11/27 10:00:00", "%Y/%m/%d %H:%M:%S")

    #Friday

    #gmtime_now = strptime("2014/11/28 10:00:00", "%Y/%m/%d %H:%M:%S")

    #Saturday

    #gmtime_now = strptime("2014/11/29 10:00:00", "%Y/%m/%d %H:%M:%S")

    #Sunday

    #gmtime_now = strptime("2014/11/30 10:00:00", "%Y/%m/%d %H:%M:%S")

    startStopInstancesForTime(gmtime_now)

def startStopInstancesForTime(gmtime_now):

    #Starts or stops instances based on the supplied GMT time.

    #@param gmtime_now - time struct of the current time in GMT

    #AWS credentials

    region = boto.config.get('sleep_tight', 'region', 'ap-southeast-2')

    aws_key = boto.config.get('sleep_tight', 'aws_access_key_id', '0')

    aws_secret = boto.config.get('sleep_tight', 'aws_secret_access_key', '0')

    # Connect to EC2

    conn = boto.ec2.connect_to_region(region, aws_access_key_id=aws_key, aws_secret_access_key=aws_secret)

    # Get current hour

    hh = strftime("%H", gmtime_now)

    # Get Today 

    this_hour_str = strftime(TODAY_HOUR_DT_FORMAT, gmtime_now)

    this_hour_time = strptime(this_hour_str, TODAY_HOUR_DT_FORMAT)

    this_day_name = strftime(TODAY_WEEKDAY_NAME, gmtime_now)

    instances = conn.get_only_instances()

    for( instance ) in instances:

        instance_id = instance.id

        name = instance.tags.get("Name", instance_id)

        state_code = instance.state_code

        start_hour_gmt = getSetTag(instance, 'START_HOUR_GMT', DEFAULT_START_GMT)

        stop_hour_gmt = getSetTag(instance, 'STOP_HOUR_GMT', DEFAULT_STOP_GMT)

        action_days = getSetTag(instance, 'ACTION_DAYS', DEFAULT_WEEKDAY_ACTION)

        no_boot_until_time = getTimeFromInstance(instance, 'NO_BOOT_UNTIL', DEFAULT_NO_BOOT_TIME, TAG_DATE_TIME_FORMAT)

        no_kill_until_time = getTimeFromInstance(instance, 'NO_KILL_UNTIL', DEFAULT_NO_KILL_TIME, TAG_DATE_TIME_FORMAT)

        last_auto_start_time = getTimeFromInstance(instance, 'LAST_AUTO_START', DEFAULT_AUTO_TIME, TODAY_HOUR_DT_FORMAT) 

        last_auto_stop_time = getTimeFromInstance(instance, 'LAST_AUTO_STOP', DEFAULT_AUTO_TIME, TODAY_HOUR_DT_FORMAT)

        action_taken = "Do Nothing"

        try: 

            if ( int(start_hour_gmt) == int(stop_hour_gmt) ):

                action_taken = "Not modifying - Start (" + start_hour_gmt + ") and stop (" \

                             + stop_hour_gmt + ") are same hour."

            elif ( isNoActionDay(action_days, this_day_name) ):

                action_taken = "Not modifying - Non actionable day (" + action_days + ") " + this_day_name

            else:

                total_msg = ""

                if ( this_hour_time <= no_boot_until_time ):

                    total_msg += "No boot until " + strftime(TAG_DATE_TIME_FORMAT, no_boot_until_time)  

                elif ( int(hh) == int(start_hour_gmt) and last_auto_start_time != this_hour_time ):

                    total_msg += processStart( conn, instance, state_code, this_hour_str )

                else:

                    total_msg += "No boot action"

                total_msg += " - "

                if ( this_hour_time <= no_kill_until_time ):

                    total_msg += "No kill until " + strftime(TAG_DATE_TIME_FORMAT, no_kill_until_time)

                elif( int(hh) == int(stop_hour_gmt) and last_auto_stop_time != this_hour_time ):

                    total_msg += processStop( conn, instance, state_code, this_hour_str )

                else:

                    total_msg += "No kill action"

                if ( total_msg != "" ):

                    action_taken = total_msg

        except:

            action_taken = "Unknown Exception"

        print this_hour_str, ':',  instance_id, state_code, start_hour_gmt, stop_hour_gmt, " --- ", action_taken, "for:", name

def getSetTag(instance, tag, default_value):

    #Attempts to retrieve the the tag from the instance.

    #If the tag doesn't exist then it will create the tag on the instance

    #with the value set to the default.

    #@param instance - boto.ec2.instance.Instance

    #@param tag - string for the tag to lookup

    #@param default_value - default string if tag does not exist

    tag_missing_default = "SOME_DEFAULT_NEVER_RTNED"

    the_tag = instance.tags.get(tag, tag_missing_default)

    if ( the_tag == tag_missing_default ):

        #the tag didnt exist copy callers default for return

        #create the tag with the callers default

        the_tag = default_value

        try:

            instance.add_tag(tag, default_value)

        except:

            doNothing = True

    #else the_tag is set to the instances tag.

    return the_tag

def getTimeFromInstance(instance, tag, default_time_str, time_format):

    #Safely reads the tag from the instance and converts it to a time structure

    #in the case the tag is incorrectly formatted, or missing it will use the 

    #default supplied as the output date

    #@param instance - boto.ec2.instance.Instance

    #@param tag - string for the tag to lookup

    #@param default_time_str - string of the date to use if the tag is missing

    #           or incorrectly formed

    #@param time_format - string of the date format the tag and default_time_str 

    #           are expected to conform to.

    time_str = getSetTag(instance, tag, default_time_str)

    try:

        time_as_struct = strptime(time_str, time_format)

    except:

        time_as_struct = strptime(default_time_str, time_format)

    return time_as_struct

def isNoActionDay( action_days, this_day_name ):

    #Determines if this day name is present in action days string

    #@param action_days - the days to return true for, is a string with the 

    #                     first letter of the days permitted. H = Thursday, U = Sunday

    #@param this_day_name - the current day of the week as three letters strftime(%a, gmtime)

    noAction = True

    switch_dict = {

        'Mon': 'M',

        'Tue': 'T',

        'Wed': 'W',

        'Thu': 'H',

        'Fri': 'F',

        'Sat': 'S',

        'Sun': 'U'

    }

    try:

       noAction = switch_dict[this_day_name] not in action_days

    except:

        print 'Unknown day', this_day_name 

    return noAction

def processStart( conn, instance, state_code, this_hour_str ):

    #Contains logic on whether to start instance based on current state.

    #Additional it will actually start the instance if determined to do so.

    #@param instance - oto.ec2.instance.Instance

    #@param state_code - instance's current state

    #@param this_hour_str - string indicating current GMT time in TODAY_HOUR_DT_FORMAT

    #@returns - string indicating the action taken.

    action_taken = "Unknown - start"

    if ( state_code == STATE_RUNNING ):

        action_taken = "Starting - no action already running"

    elif ( state_code == STATE_STOPPED ):

        action_taken = "Starting instance"

        try:

            conn.start_instances(instance_ids=instance.id, dry_run=IS_DRY_RUN)

            #tag the instance so we don't potentially attempt to start it again this hour

            instance.add_tag('LAST_AUTO_START', this_hour_str)

        except boto.exception.EC2ResponseError, e:

            print "Except while starting -", e

        #TODO start the instance and poss set elastip ip

    else:

        action_taken = "Starting - ERROR state_code"

    return action_taken

def processStop( conn, instance, state_code, this_hour_str ):

    #Contains logic on whether to stop instance based on current state.

    #Additional it will actually stop the instance if determined to do so.

    #@param instance - oto.ec2.instance.Instance

    #@param state_code - instance's current state

    #@param this_hour_str - string indicating current GMT time in TODAY_HOUR_DT_FORMAT

    #@returns - string indicating the action taken.

    action_taken = "Unknown - stop"

    if ( state_code in ( STATE_SHUTTING_DOWN, STATE_TERMINATED, STATE_STOPPING, STATE_STOPPED ) ):

        action_taken = "Stopping - no action already shutting/shutdown"

    elif ( state_code == STATE_RUNNING ):

        action_taken = "Stopping instance"

        try:

            conn.stop_instances(instance_ids=instance.id, dry_run=IS_DRY_RUN)

            #tag the instance so we don't potentially attempt to stop it again this hour

            instance.add_tag('LAST_AUTO_STOP', this_hour_str)

        except boto.exception.EC2ResponseError, e:

            print "Except while stopping -", e

    else:

        action_taken = "Stopping - ERROR state_code"

    return action_taken

#Jump to main.

if __name__ == '__main__':

    main()