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#   Copyright (C) 2016 Canonical Ltd.
#
#   Author: Ryan Harper <ryan.harper@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

import base64
import datetime
import json
import os
import time
import sys

from cloudinit import util
from cloudinit.distros import uses_systemd

#  An event:
'''
{
        "description": "executing late commands",
        "event_type": "start",
        "level": "INFO",
        "name": "cmd-install/stage-late"
        "origin": "cloudinit",
        "timestamp": 1461164249.1590767,
},

    {
        "description": "executing late commands",
        "event_type": "finish",
        "level": "INFO",
        "name": "cmd-install/stage-late",
        "origin": "cloudinit",
        "result": "SUCCESS",
        "timestamp": 1461164249.1590767
    }

'''
format_key = {
    '%d': 'delta',
    '%D': 'description',
    '%E': 'elapsed',
    '%e': 'event_type',
    '%I': 'indent',
    '%l': 'level',
    '%n': 'name',
    '%o': 'origin',
    '%r': 'result',
    '%t': 'timestamp',
    '%T': 'total_time',
}

formatting_help = " ".join(["{0}: {1}".format(k.replace('%', '%%'), v)
                           for k, v in format_key.items()])
SUCCESS_CODE = 'successful'
FAIL_CODE = 'failure'
CONTAINER_CODE = 'container'
TIMESTAMP_UNKNOWN = (FAIL_CODE, -1, -1, -1)


def format_record(msg, event):
    for i, j in format_key.items():
        if i in msg:
            # ensure consistent formatting of time values
            if j in ['delta', 'elapsed', 'timestamp']:
                msg = msg.replace(i, "{%s:08.5f}" % j)
            else:
                msg = msg.replace(i, "{%s}" % j)
    return msg.format(**event)


def dump_event_files(event):
    content = dict((k, v) for k, v in event.items() if k not in ['content'])
    files = content['files']
    saved = []
    for f in files:
        fname = f['path']
        fn_local = os.path.basename(fname)
        fcontent = base64.b64decode(f['content']).decode('ascii')
        util.write_file(fn_local, fcontent)
        saved.append(fn_local)

    return saved


def event_name(event):
    if event:
        return event.get('name')
    return None


def event_type(event):
    if event:
        return event.get('event_type')
    return None


def event_parent(event):
    if event:
        return event_name(event).split("/")[0]
    return None


def event_timestamp(event):
    return float(event.get('timestamp'))


def event_datetime(event):
    return datetime.datetime.utcfromtimestamp(event_timestamp(event))


def delta_seconds(t1, t2):
    return (t2 - t1).total_seconds()


def event_duration(start, finish):
    return delta_seconds(event_datetime(start), event_datetime(finish))


def event_record(start_time, start, finish):
    record = finish.copy()
    record.update({
        'delta': event_duration(start, finish),
        'elapsed': delta_seconds(start_time, event_datetime(start)),
        'indent': '|' + ' ' * (event_name(start).count('/') - 1) + '`->',
    })

    return record


def total_time_record(total_time):
    return 'Total Time: %3.5f seconds\n' % total_time


class SystemctlReader(object):
    '''
    Class for dealing with all systemctl subp calls in a consistent manner.
    '''
    def __init__(self, property, parameter=None):
        self.epoch = None
        self.args = ['/bin/systemctl', 'show']
        if parameter:
            self.args.append(parameter)
        self.args.extend(['-p', property])
        # Don't want the init of our object to break. Instead of throwing
        # an exception, set an error code that gets checked when data is
        # requested from the object
        self.failure = self.subp()

    def subp(self):
        '''
        Make a subp call based on set args and handle errors by setting
        failure code

        :return: whether the subp call failed or not
        '''
        try:
            value, err = util.subp(self.args, capture=True)
            if err:
                return err
            self.epoch = value
            return None
        except Exception as systemctl_fail:
            return systemctl_fail

    def parse_epoch_as_float(self):
        '''
        If subp call succeeded, return the timestamp from subp as a float.

        :return: timestamp as a float
        '''
        # subp has 2 ways to fail: it either fails and throws an exception,
        # or returns an error code. Raise an exception here in order to make
        # sure both scenarios throw exceptions
        if self.failure:
            raise RuntimeError('Subprocess call to systemctl has failed, '
                               'returning error code ({})'
                               .format(self.failure))
        # Output from systemctl show has the format Property=Value.
        # For example, UserspaceMonotonic=1929304
        timestamp = self.epoch.split('=')[1]
        # Timestamps reported by systemctl are in microseconds, converting
        return float(timestamp) / 1000000


def dist_check_timestamp():
    '''
    Determine which init system a particular linux distro is using.
    Each init system (systemd, upstart, etc) has a different way of
    providing timestamps.

    :return: timestamps of kernelboot, kernelendboot, and cloud-initstart
    or TIMESTAMP_UNKNOWN if the timestamps cannot be retrieved.
    '''

    if uses_systemd():
        return gather_timestamps_using_systemd()

    # Use dmesg to get timestamps if the distro does not have systemd
    if util.is_FreeBSD() or 'gentoo' in \
            util.system_info()['system'].lower():
        return gather_timestamps_using_dmesg()

    # this distro doesn't fit anything that is supported by cloud-init. just
    # return error codes
    return TIMESTAMP_UNKNOWN


def gather_timestamps_using_dmesg():
    '''
    Gather timestamps that corresponds to kernel begin initialization,
    kernel finish initialization using dmesg as opposed to systemctl

    :return: the two timestamps plus a dummy timestamp to keep consistency
    with gather_timestamps_using_systemd
    '''
    try:
        data, _ = util.subp(['dmesg'], capture=True)
        split_entries = data[0].splitlines()
        for i in split_entries:
            if i.decode('UTF-8').find('user') != -1:
                splitup = i.decode('UTF-8').split()
                stripped = splitup[1].strip(']')

                # kernel timestamp from dmesg is equal to 0,
                # with the userspace timestamp relative to it.
                user_space_timestamp = float(stripped)
                kernel_start = float(time.time()) - float(util.uptime())
                kernel_end = kernel_start + user_space_timestamp

                # systemd wont start cloud-init in this case,
                # so we cannot get that timestamp
                return SUCCESS_CODE, kernel_start, kernel_end, \
                    kernel_end

    except Exception:
        pass
    return TIMESTAMP_UNKNOWN


def gather_timestamps_using_systemd():
    '''
    Gather timestamps that corresponds to kernel begin initialization,
    kernel finish initialization. and cloud-init systemd unit activation

    :return: the three timestamps
    '''
    kernel_start = float(time.time()) - float(util.uptime())
    try:
        delta_k_end = SystemctlReader('UserspaceTimestampMonotonic')\
            .parse_epoch_as_float()
        delta_ci_s = SystemctlReader('InactiveExitTimestampMonotonic',
                                     'cloud-init-local').parse_epoch_as_float()
        base_time = kernel_start
        status = SUCCESS_CODE
        # lxc based containers do not set their monotonic zero point to be when
        # the container starts, instead keep using host boot as zero point
        # time.CLOCK_MONOTONIC_RAW is only available in python 3.3
        if util.is_container():
            # clock.monotonic also uses host boot as zero point
            if sys.version_info >= (3, 3):
                base_time = float(time.time()) - float(time.monotonic())
                # TODO: lxcfs automatically truncates /proc/uptime to seconds
                # in containers when https://github.com/lxc/lxcfs/issues/292
                # is fixed, util.uptime() should be used instead of stat on
                try:
                    file_stat = os.stat('/proc/1/cmdline')
                    kernel_start = file_stat.st_atime
                except OSError as err:
                    raise RuntimeError('Could not determine container boot '
                                       'time from /proc/1/cmdline. ({})'
                                       .format(err))
                status = CONTAINER_CODE
            else:
                status = FAIL_CODE
        kernel_end = base_time + delta_k_end
        cloudinit_sysd = base_time + delta_ci_s

    except Exception as e:
        # Except ALL exceptions as Systemctl reader can throw many different
        # errors, but any failure in systemctl means that timestamps cannot be
        # obtained
        print(e)
        return TIMESTAMP_UNKNOWN
    return status, kernel_start, kernel_end, cloudinit_sysd


def generate_records(events, blame_sort=False,
                     print_format="(%n) %d seconds in %I%D",
                     dump_files=False, log_datafiles=False):
    '''
    Take in raw events and create parent-child dependencies between events
    in order to order events in chronological order.

    :param events: JSONs from dump that represents events taken from logs
    :param blame_sort: whether to sort by timestamp or by time taken.
    :param print_format: formatting to represent event, time stamp,
    and time taken by the event in one line
    :param dump_files: whether to dump files into JSONs
    :param log_datafiles: whether or not to log events generated

    :return: boot records ordered chronologically
    '''

    sorted_events = sorted(events, key=lambda x: x['timestamp'])
    records = []
    start_time = None
    total_time = 0.0
    stage_start_time = {}
    stages_seen = []
    boot_records = []

    unprocessed = []
    for e in range(0, len(sorted_events)):
        event = events[e]
        try:
            next_evt = events[e + 1]
        except IndexError:
            next_evt = None

        if event_type(event) == 'start':
            if event.get('name') in stages_seen:
                records.append(total_time_record(total_time))
                boot_records.append(records)
                records = []
                start_time = None
                total_time = 0.0

            if start_time is None:
                stages_seen = []
                start_time = event_datetime(event)
                stage_start_time[event_parent(event)] = start_time

            # see if we have a pair
            if event_name(event) == event_name(next_evt):
                if event_type(next_evt) == 'finish':
                    records.append(format_record(print_format,
                                                 event_record(start_time,
                                                              event,
                                                              next_evt)))
            else:
                # This is a parent event
                records.append("Starting stage: %s" % event.get('name'))
                unprocessed.append(event)
                stages_seen.append(event.get('name'))
                continue
        else:
            prev_evt = unprocessed.pop()
            if event_name(event) == event_name(prev_evt):
                record = event_record(start_time, prev_evt, event)
                records.append(format_record("Finished stage: "
                                             "(%n) %d seconds",
                                             record) + "\n")
                total_time += record.get('delta')
            else:
                # not a match, put it back
                unprocessed.append(prev_evt)

    records.append(total_time_record(total_time))
    boot_records.append(records)
    return boot_records


def show_events(events, print_format):
    '''
    A passthrough method that makes it easier to call generate_records()

    :param events: JSONs from dump that represents events taken from logs
    :param print_format: formatting to represent event, time stamp,
    and time taken by the event in one line

    :return: boot records ordered chronologically
    '''
    return generate_records(events, print_format=print_format)


def load_events_infile(infile):
    '''
    Takes in a log file, read it, and convert to json.

    :param infile: The Log file to be read

    :return: json version of logfile, raw file
    '''
    data = infile.read()
    try:
        return json.loads(data), data
    except ValueError:
        return None, data

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