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[Sean Dague <sean@xxxxxxxxx>]

** No longer affects: nova/folsom

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https://bugs.launchpad.net/bugs/1067683

Title:
  When unique constraint error occured, exception of  NovaBase.save()
  raising cause is sqlalchemy.exc.IntegrityError.

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Now, when unique constraint error occured, sqlalchemy.exc.IntegrityError is raised without entering through the else branch if statement.
  Exception eventually receive nova.exception.DBError, because it is rapped in get_session() of nova/db/sqlalchemy/session.py

  def save(self, session=None):
      """Save this object."""
      if not session:
          session = get_session()
      session.add(self)
      try:
          session.flush()
      except IntegrityError, e:
          if str(e).endswith('is not unique'):
              raise exception.Duplicate(str(e))
          else:
              raise

  [error log]

  ======================================================================
  FAIL: test_session_flush_on_integrity_violation()
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/opt/stack/tempest/tempest/manual_tests/negative_st/test_negative_sqlalchemy.py", line 159, in test_session_flush_on_integrity_violation
      self.assertEqual(exception.Duplicate, inner_ex.__class__)
  AssertionError: <class 'nova.exception.Duplicate'> != <class 'sqlalchemy.exc.IntegrityError'>
  -------------------- >> begin captured logging << --------------------
  tempest.config: INFO: Using tempest config file /opt/stack/tempest/etc/tempest.conf
  nova.exception: ERROR: DB exception wrapped.
  Traceback (most recent call last):
    File "/opt/stack/nova/nova/exception.py", line 68, in _wrap
      return f(*args, **kwargs)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1547, in flush
      self._flush(objects)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1616, in _flush
      flush_context.execute()
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 328, in execute
      rec.execute(self)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 472, in execute
      uow
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/mapper.py", line 2264, in _save_obj
      execute(statement, multiparams)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1405, in execute
      params)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1538, in _execute_clauseelement
      compiled_sql, distilled_params
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1646, in _execute_context
      context)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1639, in _execute_context
      context)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 330, in do_execute
      cursor.execute(statement, parameters)
    File "/usr/lib/python2.7/dist-packages/MySQLdb/cursors.py", line 174, in execute
      self.errorhandler(self, exc, value)
    File "/usr/lib/python2.7/dist-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
      raise errorclass, errorvalue
  IntegrityError: (IntegrityError) (1062, "Duplicate entry '9' for key 'PRIMARY'") 'INSERT INTO services (created_at,
  updated_at, deleted_at, deleted, id, host, `binary`, topic, report_count, disabled, availability_zone) VALUES (%s,
  %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)' (datetime.datetime(2012, 9, 13, 2, 16, 22, 105645), None, None, 0, 9L,
  None, None, None, 0, 0, 'nova')

  Reason of bug seems to be to coming out of sqlarchemy error without being rapped in a nova.
  I think should return nova.exception.Duplicate.

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