old_contents: # -*- coding: utf-8 -*-
  # Copyright (c) 2014 Plivo Team. See LICENSE.txt for details.
  import time
  import msgpack
  
  VALID_IDENTIFIER_SET = set(list('abcdefghijklmnopqrstuvwxyz0123456789_-'))
  
  
  def is_valid_identifier(identifier):
      """Checks if the given identifier is valid or not. A valid
      identifier may consists of the following characters with a
      maximum length of 100 characters, minimum of 1 character.
  
      Valid characters for an identifier,
          - A to Z
          - a to z
          - 0 to 9
          - _ (underscore)
          - - (hypen)
      """
      if not isinstance(identifier, str):
          return False
  
      if len(identifier) > 100 or len(identifier) < 1:
          return False
  
      condensed_form = set(list(identifier.lower()))
      return condensed_form.issubset(VALID_IDENTIFIER_SET)
  
  
  def is_valid_interval(interval):
      """Checks if the given interval is valid. A valid interval
      is always a positive, non-zero integer value.
      """
      if not isinstance(interval, int):
          return False
  
      if interval <= 0:
          return False
  
      return True
  
  
  def is_valid_requeue_limit(requeue_limit):
      """Checks if the given requeue limit is valid.
      A valid requeue limit is always greater than
      or equal to -1.
      """
      if not isinstance(requeue_limit, int):
          return False
  
      if requeue_limit <= -2:
          return False
  
      return True
  
  
  def serialize_payload(payload):
      """Tries to serialize the payload using msgpack. If it is
      not serializable, raises a TypeError.
      """
      return msgpack.packb(payload)
  
  
  def deserialize_payload(payload):
      """Tries to deserialize the payload using msgpack.
      """
      return msgpack.unpackb(payload)
  
  
  def generate_epoch():
      """Generates an unix epoch in ms.
      """
      return int(time.time() * 1000)
  
new_contents: # -*- coding: utf-8 -*-
  # Copyright (c) 2014 Plivo Team. See LICENSE.txt for details.
  import time
  import msgpack
  
  VALID_IDENTIFIER_SET = set(list('abcdefghijklmnopqrstuvwxyz0123456789_-'))
  
  
  def is_valid_identifier(identifier):
      """Checks if the given identifier is valid or not. A valid
      identifier may consists of the following characters with a
      maximum length of 100 characters, minimum of 1 character.
  
      Valid characters for an identifier,
          - A to Z
          - a to z
          - 0 to 9
          - _ (underscore)
          - - (hypen)
      """
      if not isinstance(identifier, str):
          return False
  
      if len(identifier) > 100 or len(identifier) < 1:
          return False
  
      condensed_form = set(list(identifier.lower()))
      return condensed_form.issubset(VALID_IDENTIFIER_SET)
  
  
  def is_valid_interval(interval):
      """Checks if the given interval is valid. A valid interval
      is always a positive, non-zero integer value.
      """
      if not isinstance(interval, int):
          return False
  
      if interval <= 0:
          return False
  
      return True
  
  
  def is_valid_requeue_limit(requeue_limit):
      """Checks if the given requeue limit is valid.
      A valid requeue limit is always greater than
      or equal to -1.
      """
      if not isinstance(requeue_limit, int):
          return False
  
      if requeue_limit <= -2:
          return False
  
      return True
  
  
  def serialize_payload(payload):
      """Tries to serialize the payload using msgpack. If it is
      not serializable, raises a TypeError.
      """
      return msgpack.packb(payload, use_bin_type=True)
  
  
  def deserialize_payload(payload):
      """Tries to deserialize the payload using msgpack.
      """
      return msgpack.unpackb(payload, raw=False)
  
  
  def generate_epoch():
      """Generates an unix epoch in ms.
      """
      return int(time.time() * 1000)
  
subject: modify msgpack utils