# -*- coding: utf-8 -*-
# Copyright 2016 Google Inc. All Rights Reserved.
#
# 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.
"""Static data and helper functions for collecting user data."""

from __future__ import absolute_import
from __future__ import print_function
from __future__ import division
from __future__ import unicode_literals

import atexit
from collections import defaultdict
from functools import wraps
import logging
import os
import pickle
import platform
import re
import socket
import subprocess
import sys
import tempfile
import textwrap
import time
import uuid

import six
from six.moves import input
from six.moves import urllib
import boto

from gslib import VERSION
from gslib.metrics_tuple import Metric
from gslib.utils import system_util
from gslib.utils.unit_util import CalculateThroughput
from gslib.utils.unit_util import HumanReadableToBytes

_GA_ENDPOINT = 'https://ssl.google-analytics.com/collect'

_GA_TID = 'UA-36037335-16'
_GA_TID_TESTING = 'UA-36037335-17'
_GA_COMMANDS_CATEGORY = 'Command'
_GA_ERRORRETRY_CATEGORY = 'RetryableError'
_GA_ERRORFATAL_CATEGORY = 'FatalError'
_GA_PERFSUM_CATEGORY = 'PerformanceSummary'
# This approximates whether the host is on a Google corporate network,
# but since users choose their own hostnames, it is not guaranteed to be
# accurate.
_GOOGLE_CORP_HOST_RE = re.compile(r'.*google\.com$')

_UUID_FILE_PATH = os.path.expanduser(os.path.join('~',
                                                  '.gsutil/analytics-uuid'))
# If this string is written to analytics-uuid, that means that the user said
# 'no' to analytics, and it should thus be disabled.
_DISABLED_TEXT = 'DISABLED'

# Analytics collection uses the environment variable 'GSUTIL_TEST_ANALYTICS'.
# - A value of '1' completely disables analytics collection. This is used during
#   non-analytics tests to avoid reporting analytics events during normal
#   testing.
# - A value of '2' sets testing parameters and prevents the metrics_reporter.py
#   subprocess from writing to the metrics log file. This is used during
#   analytics tests in integration test subprocesses to disable reporting to GA
#   and avoid overwriting the metrics log file. In this scenario, the main
#   process’s root logger is enabled for debug output, so we still want
#   collection to occur so we can read metrics log messages from stderr.
# - Any other value sets default behavior.

# Map from descriptive labels to the key labels that GA recognizes.
_GA_LABEL_MAP = {
    'Event Category': 'ec',
    'Event Action': 'ea',
    'Event Label': 'el',
    'Event Value': 'ev',
    'Command Name': 'cd1',
    'Global Options': 'cd2',
    'Command-Level Options': 'cd3',
    'Config': 'cd4',
    'Command Alias': 'cd5',
    'Fatal Error': 'cd6',
    'Parallelism Strategy': 'cd7',
    'Source URL Type': 'cd8',
    'Provider Types': 'cd9',
    'Timestamp': 'cd10',
    'Execution Time': 'cm1',
    'Retryable Errors': 'cm2',
    'Is Google Corp User': 'cm3',
    'Num Processes': 'cm4',
    'Num Threads': 'cm5',
    'Number of Files/Objects Transferred': 'cm6',
    'Size of Files/Objects Transferred': 'cm7',
    'Average Overall Throughput': 'cm8',
    'Num Retryable Service Errors': 'cm9',
    'Num Retryable Network Errors': 'cm10',
    'Thread Idle Time Percent': 'cm11',
    'Slowest Thread Throughput': 'cm12',
    'Fastest Thread Throughput': 'cm13',
    'Disk I/O Time': 'cm14',
}


class MetricsCollector(object):
  """A singleton class to handle metrics reporting to Google Analytics (GA).

  This class is not thread or process-safe, and logging directly to the
  MetricsCollector instance can only be done by a single thread.
  """

  def __init__(self, ga_tid=_GA_TID, endpoint=_GA_ENDPOINT):
    """Initialize a new MetricsCollector.

    This should only be invoked through the GetCollector or StartTestCollector
    functions.

    Args:
      ga_tid: The Google Analytics tracking ID to use for metrics collection.
      endpoint: The URL to send requests to.
    """
    self.start_time = _GetTimeInMillis()
    self.endpoint = endpoint
    self.logger = logging.getLogger()

    # Calculate parameters to send with every GA event, stored as ga_params.
    cid = MetricsCollector._GetCID()

    # gsutil developers should set this config value to true in order to hit the
    # testing GA property rather than the production property.
    use_test_property = boto.config.getbool('GSUtil', 'use_test_GA_property')
    if use_test_property:
      ga_tid = _GA_TID_TESTING

    # A string of non-PII config values.
    config_values = self._ValidateAndGetConfigValues()

    # Approximate if this is a Google corporate user.
    is_corp_user = 0
    if _GOOGLE_CORP_HOST_RE.match(socket.gethostname()):
      is_corp_user = 1

    self.ga_params = {
        'v': '1',
        'tid': ga_tid,
        'cid': cid,
        't': 'event',
        _GA_LABEL_MAP['Config']: config_values,
        _GA_LABEL_MAP['Is Google Corp User']: is_corp_user,
    }

    # Used by Google Analytics to track user OS.
    self.user_agent = '{system}/{release}'.format(system=platform.system(),
                                                  release=platform.release())

    # A list of collected, unsent Metrics. This list is currently bounded by
    # the number of retryable error types, and should not grow too large so that
    # we stay well within memory constraints.
    self._metrics = []

    # Store a count of the number of each type of retryable error.
    self.retryable_errors = defaultdict(int)

    # This will be set to keep track of information necessary for a
    # PerformanceSummary if the cp or rsync commands are run.
    self.perf_sum_params = None

  _instance = None
  # Whether analytics collection is disabled or not.
  _disabled_cache = None

  def _ValidateAndGetConfigValues(self):
    """Parses the user's config file to aggregate non-PII config values.

    Returns:
      A comma-delimited string of config values explicitly set by the user in
      key:value pairs, sorted alphabetically by key.
    """
    config_values = []

    # If a user has an invalid config value set, we will mark it as such with
    # this value. If a user did not enter a value, we will not report it.
    invalid_value_string = 'INVALID'

    def GetAndValidateConfigValue(section, category, validation_fn):
      try:
        config_value = boto.config.get_value(section, category)
        if config_value and validation_fn(config_value):
          config_values.append((category, config_value))
        # If the user entered a non-valid config value, store it as invalid.
        elif config_value:
          config_values.append((category, invalid_value_string))
      # This function gets called during initialization of the MetricsCollector.
      # If any of the logic fails, we do not want to hinder the gsutil command
      # being run, and thus ignore any exceptions.
      except:  # pylint: disable=bare-except
        config_values.append((category, invalid_value_string))

    # Validate boolean values.
    for section, bool_category in (('Boto', 'https_validate_certificates'),
                                   ('GSUtil', 'disable_analytics_prompt'),
                                   ('GSUtil', 'use_magicfile'),
                                   ('GSUtil', 'tab_completion_time_logs')):
      GetAndValidateConfigValue(section=section,
                                category=bool_category,
                                validation_fn=lambda val: str(val).lower() in
                                ('true', 'false'))

    # Define a threshold for some config values which should be reasonably low.
    small_int_threshold = 2000
    # Validate small integers.
    for section, small_int_category in (
        ('Boto', 'debug'),
        ('Boto', 'http_socket_timeout'),
        ('Boto', 'num_retries'),
        ('Boto', 'max_retry_delay'),
        ('GSUtil', 'default_api_version'),
        ('GSUtil', 'sliced_object_download_max_components'),
        ('GSUtil', 'parallel_process_count'),
        ('GSUtil', 'parallel_thread_count'),
        ('GSUtil', 'software_update_check_period'),
        ('GSUtil', 'tab_completion_timeout'),
        ('OAuth2', 'oauth2_refresh_retries'),
    ):
      GetAndValidateConfigValue(section=section,
                                category=small_int_category,
                                validation_fn=lambda val: str(val).isdigit() and
                                int(val) < small_int_threshold)

    # Validate large integers.
    for section, large_int_category in (('GSUtil', 'resumable_threshold'),
                                        ('GSUtil', 'rsync_buffer_lines'),
                                        ('GSUtil',
                                         'task_estimation_threshold')):
      GetAndValidateConfigValue(section=section,
                                category=large_int_category,
                                validation_fn=lambda val: str(val).isdigit())

    # Validate data sizes.
    for section, data_size_category in (
        ('GSUtil', 'parallel_composite_upload_component_size'),
        ('GSUtil', 'parallel_composite_upload_threshold'),
        ('GSUtil', 'sliced_object_download_component_size'),
        ('GSUtil', 'sliced_object_download_threshold'),
    ):
      config_value = boto.config.get_value(section, data_size_category)
      if config_value:
        try:
          size_in_bytes = HumanReadableToBytes(config_value)
          config_values.append((data_size_category, size_in_bytes))
        except ValueError:
          config_values.append((data_size_category, invalid_value_string))

    # Validate specific options.
    # pylint: disable=g-long-lambda
    GetAndValidateConfigValue(
        section='GSUtil',
        category='check_hashes',
        validation_fn=lambda val: val in
        ('if_fast_else_fail', 'if_fast_else_skip', 'always', 'never'))
    # pylint: enable=g-long-lambda
    GetAndValidateConfigValue(
        section='GSUtil',
        category='content_language',
        validation_fn=lambda val: val.isalpha() and len(val) <= 3)
    GetAndValidateConfigValue(
        section='GSUtil',
        category='json_api_version',
        validation_fn=lambda val: val[0].lower() == 'v' and val[1:].isdigit())
    GetAndValidateConfigValue(section='GSUtil',
                              category='prefer_api',
                              validation_fn=lambda val: val in ('json', 'xml'))
    GetAndValidateConfigValue(section='OAuth2',
                              category='token_cache',
                              validation_fn=lambda val: val in
                              ('file_system', 'in_memory'))

    return ','.join(
        sorted([
            '{0}:{1}'.format(config[0], config[1]) for config in config_values
        ]))

  @staticmethod
  def GetCollector(ga_tid=_GA_TID):
    """Returns the singleton MetricsCollector instance or None if disabled."""
    if MetricsCollector.IsDisabled():
      return None

    if not MetricsCollector._instance:
      MetricsCollector._instance = MetricsCollector(ga_tid)
    return MetricsCollector._instance

  @staticmethod
  def IsDisabled():
    """Returns whether metrics collection should be disabled."""
    if MetricsCollector._disabled_cache is None:
      MetricsCollector._CheckAndSetDisabledCache()
    return MetricsCollector._disabled_cache

  @classmethod
  def _CheckAndSetDisabledCache(cls):
    """Sets _disabled_cache based on user opt-in or out."""
    # Disable collection for a test case where no metrics should be collected.
    if os.environ.get('GSUTIL_TEST_ANALYTICS') == '1':
      cls._disabled_cache = True
    # Enable test collector for a subprocess integration test case where we
    # check the log output, which requires a test collector.
    elif os.environ.get('GSUTIL_TEST_ANALYTICS') == '2':
      cls._disabled_cache = False
      cls.StartTestCollector()

    # Non-testing cases involve checking for shim usage, the cloud SDK wrapper
    # and the analytics uuid file.
    elif boto.config.getbool('GSUtil', 'use_gcloud_storage', False):
      cls._disabled_cache = True
    elif system_util.InvokedViaCloudSdk():
      cls._disabled_cache = not os.environ.get('GA_CID')
    elif os.path.exists(_UUID_FILE_PATH):
      with open(_UUID_FILE_PATH) as f:
        cls._disabled_cache = (f.read() == _DISABLED_TEXT)
    else:
      cls._disabled_cache = True

  @classmethod
  def StartTestCollector(cls,
                         endpoint='https://example.com',
                         user_agent='user-agent-007',
                         ga_params=None):
    """Reset the singleton MetricsCollector with testing parameters.

    Should only be used for tests, where we want to change the default
    parameters.

    Args:
      endpoint: str, URL to post to
      user_agent: str, User-Agent string for header.
      ga_params: A list of two-dimensional string tuples to send as parameters.
    """
    # Re-enable analytics for the duration of the testing.
    if cls.IsDisabled():
      os.environ['GSUTIL_TEST_ANALYTICS'] = '0'
    cls._disabled_cache = False
    cls._instance = cls(_GA_TID_TESTING, endpoint)
    if ga_params is None:
      ga_params = {'a': 'b', 'c': 'd'}
    cls._instance.ga_params = ga_params
    cls._instance.user_agent = user_agent
    if os.environ['GSUTIL_TEST_ANALYTICS'] != '2':
      cls._instance.start_time = 0

  @classmethod
  def StopTestCollector(cls, original_instance=None):
    """Reset the MetricsCollector with default parameters after testing.

    Args:
      original_instance: The original instance of the MetricsCollector so we can
        set the collector back to its original state.
    """
    os.environ['GSUTIL_TEST_ANALYTICS'] = '1'
    cls._disabled_cache = None
    cls._instance = original_instance

  @staticmethod
  def _GetCID():
    """Gets the client id from the UUID file or the SDK opt-in, or returns None.

    Returns:
      str, The hex string of the client id.
    """
    if os.path.exists(_UUID_FILE_PATH):
      with open(_UUID_FILE_PATH) as f:
        cid = f.read()
      if cid:
        return cid

    # Returns CID from SDK. This value will be None if there is no opt-in from
    # the SDK.
    return os.environ.get('GA_CID')

  def ExtendGAParams(self, new_params):
    """Extends self.ga_params to include new parameters.

    This is only used to record parameters that are sent with every event type,
    such as global and command-level options.

    Args:
      new_params: A dictionary of key-value parameters to send.
    """
    self.ga_params.update(new_params)

  def GetGAParam(self, param_name):
    """Convenience function for getting a ga_param of the collector.

    Args:
      param_name: The descriptive name of the param (e.g. 'Command Name'). Must
        be a key in _GA_LABEL_MAP.

    Returns:
      The GA parameter specified, or None.
    """
    return self.ga_params.get(_GA_LABEL_MAP[param_name])

  def CollectGAMetric(self,
                      category,
                      action,
                      label=VERSION,
                      value=0,
                      execution_time=None,
                      **custom_params):
    """Adds a GA metric with the given parameters to the metrics queue.

    Args:
      category: str, the GA Event category.
      action: str, the GA Event action.
      label: str, the GA Event label.
      value: int, the GA Event value.
      execution_time: int, the execution time to record in ms.
      **custom_params: A dictionary of key, value pairs containing custom
          metrics and dimensions to send with the GA Event.
    """
    params = [('ec', category), ('ea', action), ('el', label), ('ev', value),
              (_GA_LABEL_MAP['Timestamp'], _GetTimeInMillis())]
    params.extend([
        (k, v) for k, v in six.iteritems(custom_params) if v is not None
    ])
    params.extend([
        (k, v) for k, v in six.iteritems(self.ga_params) if v is not None
    ])

    # Log how long after the start of the program this event happened.
    if execution_time is None:
      execution_time = _GetTimeInMillis() - self.start_time
    params.append((_GA_LABEL_MAP['Execution Time'], execution_time))

    data = urllib.parse.urlencode(sorted(params))
    self._metrics.append(
        Metric(endpoint=self.endpoint,
               method='POST',
               body=data,
               user_agent=self.user_agent))

  # TODO: Collect CPU usage (Linux-only), latency to first byte, and slowest
  # thread process.
  class _PeformanceSummaryParams(object):
    """This class contains information to create a PerformanceSummary event."""

    def __init__(self):
      self.num_processes = 0
      self.num_threads = 0
      self.num_retryable_service_errors = 0
      self.num_retryable_network_errors = 0
      self.provider_types = set()

      # Store the disk stats at the beginning of the command so we can calculate
      # time spent on disk I/O.
      if system_util.IS_LINUX:
        self.disk_counters_start = system_util.GetDiskCounters()

      # True if using fan parallelism, when the user specifies the -m option.
      self.uses_fan = False
      # True if the command uses slice parallelism.
      self.uses_slice = False

      # The total times in seconds spent idle and executing by threads.
      self.thread_idle_time = 0
      self.thread_execution_time = 0

      # This maps (process id, thread id) to a _ThreadThroughputInfo object,
      # keeping track of elapsed time and bytes processed.
      self.thread_throughputs = defaultdict(self._ThreadThroughputInformation)

      # Data transfer statistics.
      self.avg_throughput = None
      # This is the amount of time spent on the Apply call of cp and rsync.
      self.total_elapsed_time = None
      self.total_bytes_transferred = None
      self.num_objects_transferred = 0

      # Information to determine the type of transfer.
      self.is_daisy_chain = False
      self.has_file_dst = False
      self.has_cloud_dst = False
      self.has_file_src = False
      self.has_cloud_src = False

    class _ThreadThroughputInformation(object):
      """A class to keep track of throughput information for a single thread."""

      def __init__(self):
        self.total_bytes_transferred = 0
        self.total_elapsed_time = 0
        # Start time in seconds of the current task. None if the thread is not
        # currently executing a task.
        self.task_start_time = None
        # The size of the current task, if any. A FileMessage gives us size at
        # the beginning of a transfer, but we don't want to count these bytes
        # until the transfer is complete.
        self.task_size = None

      def LogTaskStart(self, start_time, bytes_to_transfer):
        self.task_start_time = start_time
        self.task_size = bytes_to_transfer

      def LogTaskEnd(self, end_time):
        self.total_elapsed_time += end_time - self.task_start_time
        self.total_bytes_transferred += self.task_size
        self.task_start_time = None
        self.task_size = None

      def GetThroughput(self):
        return CalculateThroughput(self.total_bytes_transferred,
                                   self.total_elapsed_time)

  def UpdatePerformanceSummaryParams(self, params):
    """Updates the _PeformanceSummaryParams object.

    Args:
      params: A dictionary of keyword arguments.
        - uses_fan: True if the command uses fan parallelism.
        - uses_slice: True if the command uses slice parallelism.
        - avg_throughput: The average throughput of the data transfer.
        - is_daisy_chain: True if the transfer uses the daisy-chain method.
        - has_file_dst: True if the transfer's destination is a file URL.
        - has_cloud_dst: True if the transfer's destination is in the cloud.
        - has_file_src: True if the transfer has a file URL as a source.
        - has_cloud_src: True if the transfer has a cloud URL as a source.
        - total_elapsed_time: The total amount of time spent on Apply.
        - total_bytes_transferred: The total number of bytes transferred.
        - thread_idle_time: The additional amount of time that threads spent
                            idle in Apply.
        - thread_execution_time: The additional amount of time that threads
                                 spent executing in Apply.
        - num_retryable_service_errors: The additional number of retryable
                                        service errors that occurred.
        - num_retryable_network_errors: The additional number of retryable
                                        network errors that occurred.
        - num_processes: The number of processes used in a call to Apply.
        - num_threads: The number of threads used in a call to Apply.
        - num_objects_transferred: The total number of objects transferred, as
                                   specified by a ProducerThreadMessage.
        - provider_types: A list of additional provider types used.
        - file_message: A FileMessage used to calculate thread throughput and
                        number of objects transferred in the non-parallel case.
    """
    if self.GetGAParam('Command Name') not in ('cp', 'rsync'):
      return
    if self.perf_sum_params is None:
      self.perf_sum_params = self._PeformanceSummaryParams()

    # Most of the parameters are logged only one time, but FileMessages are much
    # more common, with a minimum of 2 per file copied. Since FileMessages are
    # logged on their own, we can avoid performing the other checks.
    if 'file_message' in params:
      self._ProcessFileMessage(file_message=params['file_message'])
      return

    for param_name, param in six.iteritems(params):
      # These parameters start in 0 or False state and can be updated to a
      # non-zero value or True.
      if param_name in ('uses_fan', 'uses_slice', 'avg_throughput',
                        'is_daisy_chain', 'has_file_dst', 'has_cloud_dst',
                        'has_file_src', 'has_cloud_src', 'total_elapsed_time',
                        'total_bytes_transferred', 'num_objects_transferred'):
        cur_value = getattr(self.perf_sum_params, param_name)
        if not cur_value:
          setattr(self.perf_sum_params, param_name, param)

      # These parameters need to be incremented.
      if param_name in ('thread_idle_time', 'thread_execution_time',
                        'num_retryable_service_errors',
                        'num_retryable_network_errors'):
        cur_value = getattr(self.perf_sum_params, param_name)
        setattr(self.perf_sum_params, param_name, cur_value + param)

      # Different calls to Apply might use different numbers of processes and
      # threads; we want the maximum of these.
      if param_name in ('num_processes', 'num_threads'):
        cur_value = getattr(self.perf_sum_params, param_name)
        if cur_value < param:
          setattr(self.perf_sum_params, param_name, param)

      # If we have new provider types, add them to our set.
      if param_name == 'provider_types':
        self.perf_sum_params.provider_types.update(param)

  def _ProcessFileMessage(self, file_message):
    """Processes FileMessages for thread throughput calculations.

    Update a thread's throughput based on the FileMessage, which marks the start
    or end of a file or component transfer. The FileMessage provides the number
    of bytes transferred as well as start and end time.

    Args:
      file_message: The FileMessage to process.
    """
    thread_info = (self.perf_sum_params.thread_throughputs[(
        file_message.process_id, file_message.thread_id)])
    if file_message.finished:
      # If this operation doesn't use parallelism, we manually update the
      # number of objects transferred rather than relying on
      # ProducerThreadMessages.
      if not (self.perf_sum_params.uses_slice or self.perf_sum_params.uses_fan):
        self.perf_sum_params.num_objects_transferred += 1
      thread_info.LogTaskEnd(file_message.time)
    else:
      thread_info.LogTaskStart(file_message.time, file_message.size)

  def _CollectCommandAndErrorMetrics(self):
    """Aggregates command and error info and adds them to the metrics list."""
    # Collect the command metric, including the number of retryable errors.
    command_name = self.GetGAParam('Command Name')
    if command_name:
      self.CollectGAMetric(category=_GA_COMMANDS_CATEGORY,
                           action=command_name,
                           **{
                               _GA_LABEL_MAP['Retryable Errors']:
                                   sum(self.retryable_errors.values())
                           })

    # Collect the retryable errors.
    for error_type, num_errors in six.iteritems(self.retryable_errors):
      self.CollectGAMetric(category=_GA_ERRORRETRY_CATEGORY,
                           action=error_type,
                           **{_GA_LABEL_MAP['Retryable Errors']: num_errors})

    # Collect the fatal error, if any.
    fatal_error_type = self.GetGAParam('Fatal Error')
    if fatal_error_type:
      self.CollectGAMetric(category=_GA_ERRORFATAL_CATEGORY,
                           action=fatal_error_type)

  def _CollectPerformanceSummaryMetric(self):
    """Aggregates PerformanceSummary info and adds the metric to the list."""
    if self.perf_sum_params is None:
      return

    custom_params = {}

    # These parameters need no further processing.
    for attr_name, label in (
        ('num_processes', 'Num Processes'),
        ('num_threads', 'Num Threads'),
        ('num_retryable_service_errors', 'Num Retryable Service Errors'),
        ('num_retryable_network_errors', 'Num Retryable Network Errors'),
        ('avg_throughput', 'Average Overall Throughput'),
        ('num_objects_transferred', 'Number of Files/Objects Transferred'),
        ('total_bytes_transferred', 'Size of Files/Objects Transferred'),
    ):
      custom_params[_GA_LABEL_MAP[label]] = getattr(self.perf_sum_params,
                                                    attr_name)

    # Calculate the disk stats again to calculate deltas of time spent on I/O.
    if system_util.IS_LINUX:
      disk_start = self.perf_sum_params.disk_counters_start
      disk_end = system_util.GetDiskCounters()
      # Read and write time are the 5th and 6th elements of the stat tuple.
      custom_params[_GA_LABEL_MAP['Disk I/O Time']] = (
          sum([stat[4] + stat[5] for stat in disk_end.values()]) -
          sum([stat[4] + stat[5] for stat in disk_start.values()]))

    # Determine source URL type(s).
    if self.perf_sum_params.has_cloud_src:
      src_url_type = 'both' if self.perf_sum_params.has_file_src else 'cloud'
    else:
      src_url_type = 'file'
    custom_params[_GA_LABEL_MAP['Source URL Type']] = src_url_type

    # Determine the type of parallelism used, if any.
    if self.perf_sum_params.uses_fan:
      strategy = 'both' if self.perf_sum_params.uses_slice else 'fan'
    else:
      strategy = 'slice' if self.perf_sum_params.uses_slice else 'none'
    custom_params[_GA_LABEL_MAP['Parallelism Strategy']] = strategy

    # Determine the percentage of time that threads spent idle.
    total_time = (self.perf_sum_params.thread_idle_time +
                  self.perf_sum_params.thread_execution_time)
    if total_time:
      custom_params[_GA_LABEL_MAP['Thread Idle Time Percent']] = (
          float(self.perf_sum_params.thread_idle_time) / float(total_time))

    # Determine the slowest and fastest thread throughputs.
    if self.perf_sum_params.thread_throughputs:
      throughputs = [
          thread.GetThroughput()
          for thread in self.perf_sum_params.thread_throughputs.values()
      ]
      custom_params[_GA_LABEL_MAP['Slowest Thread Throughput']] = min(
          throughputs)
      custom_params[_GA_LABEL_MAP['Fastest Thread Throughput']] = max(
          throughputs)

    # Determine the provider(s) used.
    custom_params[_GA_LABEL_MAP['Provider Types']] = ','.join(
        sorted(self.perf_sum_params.provider_types))

    # Determine the transfer types.
    # This maps a transfer type to whether the condition has been met for it.
    transfer_types = {
        'CloudToCloud':
            self.perf_sum_params.has_cloud_src
            and self.perf_sum_params.has_cloud_dst,
        'CloudToFile':
            self.perf_sum_params.has_cloud_src
            and self.perf_sum_params.has_file_dst,
        'DaisyChain':
            self.perf_sum_params.is_daisy_chain,
        'FileToCloud':
            self.perf_sum_params.has_file_src
            and self.perf_sum_params.has_cloud_dst,
        'FileToFile':
            self.perf_sum_params.has_file_src
            and self.perf_sum_params.has_file_dst,
    }
    action = ','.join(
        sorted([
            transfer_type
            for transfer_type, cond in six.iteritems(transfer_types)
            if cond
        ]))

    # Use the time spent on Apply rather than the total command execution time
    # for the execution time metric. This aligns more closely with throughput
    # and bytes transferred, and the corresponding Command event already tells
    # us the total time. If PerformanceSummary events are expanded, this may not
    # reflect one Apply call as commands like rm may call Apply twice. Currently
    # Apply is timed directly in the RunCommand methods of cp and rsync.
    apply_execution_time = _GetTimeInMillis(
        self.perf_sum_params.total_elapsed_time)

    self.CollectGAMetric(category=_GA_PERFSUM_CATEGORY,
                         action=action,
                         execution_time=apply_execution_time,
                         **custom_params)

  def ReportMetrics(self,
                    wait_for_report=False,
                    log_level=None,
                    log_file_path=None):
    """Reports the collected metrics using a separate async process.

    Args:
      wait_for_report: bool, True if the main process should wait for the
        subprocess to exit for testing purposes.
      log_level: int, The subprocess logger's level of debugging for testing
        purposes.
      log_file_path: str, The file that the metrics_reporter module should
        write its logs to. If not supplied, the metrics_reporter module will
        use a predetermined default path. This parameter is intended for use
        by tests that need to evaluate the contents of the file at this path.
    """
    self._CollectCommandAndErrorMetrics()
    self._CollectPerformanceSummaryMetric()
    if not self._metrics:
      return

    if not log_level:
      log_level = self.logger.getEffectiveLevel()
    # If this a testing subprocess, we don't want to write to the log file.
    if os.environ.get('GSUTIL_TEST_ANALYTICS') == '2':
      log_level = logging.WARN

    temp_metrics_file = tempfile.NamedTemporaryFile(delete=False)
    temp_metrics_file_name = six.ensure_str(temp_metrics_file.name)
    with temp_metrics_file:
      pickle.dump(self._metrics, temp_metrics_file)
    logging.debug(self._metrics)
    self._metrics = []

    if log_file_path is not None:
      # If the path is not None, we'll need to surround the path with quotes
      # so that the path is passed as a string to the metrics_reporter module.
      log_file_path = six.ensure_str('r"%s"' % log_file_path)

    reporting_code = six.ensure_str(
        'from gslib.metrics_reporter import ReportMetrics; '
        'ReportMetrics(r"{0}", {1}, log_file_path={2})'.format(
            temp_metrics_file_name, log_level, log_file_path))
    execution_args = [sys.executable, '-c', reporting_code]
    exec_env = os.environ.copy()
    exec_env['PYTHONPATH'] = os.pathsep.join(sys.path)
    # Ensuring submodule (sm) environment keys and values are all str.
    sm_env = dict()
    for k, v in six.iteritems(exec_env):
      sm_env[six.ensure_str(k)] = six.ensure_str(v)
    try:
      # In order for Popen to work correctly with Windows/Py3 shell needs
      # to be True.
      p = subprocess.Popen(execution_args,
                           env=sm_env,
                           shell=(six.PY3 and system_util.IS_WINDOWS))
      self.logger.debug('Metrics reporting process started...')

      if wait_for_report:
        # NOTE: p.wait() can cause a deadlock. p.communicate() is recommended.
        # See python docs for more information.
        p.communicate()
        self.logger.debug('Metrics reporting process finished.')
    except OSError:
      # This can happen specifically if the Python executable moves between the
      # start of this process and now.
      self.logger.debug('Metrics reporting process failed to start.')
      # Delete the tempfile that would normally be cleaned up in the subprocess.
      try:
        os.unlink(temp_metrics_file.name)
      except:  # pylint: disable=bare-except
        pass


def CaptureAndLogException(func):
  """Function decorator to capture and log any exceptions.

  This is extra insurance that analytics collection will not hinder the command
  being run upon an error.

  Args:
    func: The function to wrap.

  Returns:
    The wrapped function.
  """

  @wraps(func)
  def Wrapper(*args, **kwds):
    try:
      return func(*args, **kwds)
    except Exception as e:  # pylint:disable=broad-except
      logger = logging.getLogger('metrics')
      logger.debug('Exception captured in %s during metrics collection: %s',
                   func.__name__, e)

  return Wrapper


def CaptureThreadStatException(func):
  """Function decorator to ignore an exception on collecting thread stats.

  An exception can happen if the thread_stats dictionary's manager gets shutdown
  before the thread's process is successfully killed. See
  _ThreadStat.AggregateStat for how we handle that case.

  Args:
    func: The function to wrap.

  Returns:
    The wrapped function.
  """

  @wraps(func)
  def Wrapper(*args, **kwds):
    try:
      return func(*args, **kwds)
    except:  # pylint:disable=bare-except
      # Don't surface the exception to the user.
      pass

  return Wrapper


# Ordering of these wrappers is important, since both have exception handling.
# CaptureAndLogException will swallow the exception.
@atexit.register
@CaptureAndLogException
def Shutdown():
  """Reports the metrics that were collected upon termination."""
  collector = MetricsCollector.GetCollector()
  if collector:
    collector.ReportMetrics()


@CaptureAndLogException
def LogCommandParams(command_name=None,
                     subcommands=None,
                     global_opts=None,
                     sub_opts=None,
                     command_alias=None):
  """Logs info about the gsutil command being run.

  This only updates the collector's ga_params. The actual command metric will
  be collected once ReportMetrics() is called at shutdown.

  Args:
    command_name: str, The official command name (e.g. version instead of ver).
    subcommands: A list of subcommands as strings already validated by
      RunCommand. We do not log subcommands for the help or test commands.
    global_opts: A list of string tuples already parsed by __main__.
    sub_opts: A list of command-level options as string tuples already parsed
      by RunCommand.
    command_alias: str, The supported alias that the user inputed.
  """
  collector = MetricsCollector.GetCollector()
  if not collector:
    return

  # Never re-log any parameter that's already there, as we should only be
  # collecting the global (user-run) command.
  if command_name and not collector.GetGAParam('Command Name'):
    collector.ExtendGAParams({_GA_LABEL_MAP['Command Name']: command_name})
  if global_opts and not collector.GetGAParam('Global Options'):
    global_opts_string = ','.join(
        sorted([opt[0].strip('-') for opt in global_opts]))
    collector.ExtendGAParams(
        {_GA_LABEL_MAP['Global Options']: global_opts_string})

  # Only log subcommands, suboptions, and command alias if a command has been
  # logged.
  command_name = collector.GetGAParam('Command Name')
  if not command_name:
    return
  if subcommands:
    full_command_name = '{0} {1}'.format(command_name, ' '.join(subcommands))
    collector.ExtendGAParams({_GA_LABEL_MAP['Command Name']: full_command_name})
  if sub_opts and not collector.GetGAParam('Command-Level Options'):
    sub_opts_string = ','.join(sorted([opt[0].strip('-') for opt in sub_opts]))
    collector.ExtendGAParams(
        {_GA_LABEL_MAP['Command-Level Options']: sub_opts_string})
  if command_alias and not collector.GetGAParam('Command Alias'):
    collector.ExtendGAParams({_GA_LABEL_MAP['Command Alias']: command_alias})


@CaptureAndLogException
def LogRetryableError(message):
  """Logs that a retryable error was caught for a gsutil command.

  Args:
    message: The RetryableErrorMessage posted to the global status queue.
  """
  collector = MetricsCollector.GetCollector()
  if collector:
    # Update the retryable_errors defaultdict.
    collector.retryable_errors[message.error_type] += 1
    # Update the service error or network error count.
    if message.is_service_error:
      LogPerformanceSummaryParams(num_retryable_service_errors=1)
    else:
      LogPerformanceSummaryParams(num_retryable_network_errors=1)


@CaptureAndLogException
def LogFatalError(exception):
  """Logs that a fatal error was caught for a gsutil command.

  Args:
    exception: The exception that the command failed on.
  """
  collector = MetricsCollector.GetCollector()
  if collector:
    collector.ExtendGAParams(
        {_GA_LABEL_MAP['Fatal Error']: exception.__class__.__name__})


@CaptureAndLogException
def LogPerformanceSummaryParams(**params_to_update):
  """Logs parameters necessary for a PerformanceSummary.

  gsutil periodically monitors its own threads; at the end of the execution of
  each cp/rsync command, it will present a performance summary of the command
  run.

  Args:
    **params_to_update: A dictionary. See UpdatePerformanceSummaryParams for
        details. The argument ambiguity at this level allows for flexibility in
        dealing with arguments that are processed similarly.
  """
  collector = MetricsCollector.GetCollector()
  if collector:
    collector.UpdatePerformanceSummaryParams(params_to_update)


@CaptureAndLogException
def CheckAndMaybePromptForAnalyticsEnabling():
  """Asks a user to opt-in to data collection if a UUID file does not exist.

  If the user agrees, generates a UUID file. Will not prompt if part of SDK.
  """
  disable_prompt = boto.config.get_value('GSUtil', 'disable_analytics_prompt')
  if (not os.path.exists(_UUID_FILE_PATH) and not disable_prompt and
      not system_util.InvokedViaCloudSdk()):
    enable_analytics = input('\n' + textwrap.fill(
        'gsutil developers rely on user feedback to make improvements to the '
        'tool. Would you like to send anonymous usage statistics to help '
        'improve gsutil? [y/N]') + ' ')

    text_to_write = _DISABLED_TEXT
    if enable_analytics.lower()[0] == 'y':
      text_to_write = uuid.uuid4().hex
    system_util.CreateDirIfNeeded(os.path.dirname(_UUID_FILE_PATH))
    with open(_UUID_FILE_PATH, 'w') as f:
      f.write(text_to_write)


def _GetTimeInMillis(time_in_sec=None):
  if time_in_sec is None:
    time_in_sec = time.time()
  return int(time_in_sec * 1000)