def format_transactions_after_pointer(namespace, pointer, db_session,
result_limit, exclude_types=None,
include_types=None, exclude_folders=True,
exclude_metadata=True, exclude_account=True,
expand=False):
"""
Return a pair (deltas, new_pointer), where deltas is a list of change
events, represented as dictionaries:
{
"object": <API object type, e.g. "thread">,
"event": <"create", "modify", or "delete>,
"attributes": <API representation of the object for insert/update events>
"cursor": <public_id of the transaction>
}
and new_pointer is the integer id of the last included transaction
Arguments
---------
namespace_id: int
Id of the namespace for which to get changes.
pointer: int
Process transactions starting after this id.
db_session: new_session
database session
result_limit: int
Maximum number of results to return. (Because we may roll up multiple
changes to the same object, fewer results can be returned.)
format_transaction_fn: function pointer
Function that defines how to format the transactions.
exclude_types: list, optional
If given, don't include transactions for these types of objects.
"""
exclude_types = set(exclude_types) if exclude_types else set()
# Begin backwards-compatibility shim -- suppress new object types for now,
# because clients may not be able to deal with them.
if exclude_folders is True:
exclude_types.update(('folder', 'label'))
if exclude_account is True:
exclude_types.add('account')
# End backwards-compatibility shim.
# Metadata is excluded by default, and can only be included by setting the
# exclude_metadata flag to False. If listed in include_types, remove it.
if exclude_metadata is True:
exclude_types.add('metadata')
if include_types is not None and 'metadata' in include_types:
include_types.remove('metadata')
last_trx = _get_last_trx_id_for_namespace(namespace.id, db_session)
if last_trx == pointer:
return ([], pointer)
while True:
# deleted_at condition included to allow this query to be satisfied via
# the legacy index on (namespace_id, deleted_at) for performance.
# Also need to explicitly specify the index hint because the query
# planner is dumb as nails and otherwise would make this super slow for
# some values of namespace_id and pointer.
# TODO(emfree): Remove this hack and ensure that the right index (on
# namespace_id only) exists.
transactions = db_session.query(Transaction). \
filter(
Transaction.id > pointer,
Transaction.namespace_id == namespace.id,
Transaction.deleted_at.is_(None)). \
with_hint(Transaction, 'USE INDEX (namespace_id_deleted_at)')
if exclude_types is not None:
transactions = transactions.filter(
~Transaction.object_type.in_(exclude_types))
if include_types is not None:
transactions = transactions.filter(
Transaction.object_type.in_(include_types))
transactions = transactions. \
order_by(asc(Transaction.id)).limit(result_limit).all()
if not transactions:
return ([], pointer)
results = []
# Group deltas by object type.
trxs_by_obj_type = collections.defaultdict(list)
for trx in transactions:
trxs_by_obj_type[trx.object_type].append(trx)
for obj_type, trxs in trxs_by_obj_type.items():
# Build a dictionary mapping pairs (record_id, command) to
# transaction. If successive modifies for a given record id appear
# in the list of transactions, this will only keep the latest
# one (which is what we want).
latest_trxs = {(trx.record_id, trx.command): trx for trx in
sorted(trxs, key=lambda t: t.id)}.values()
# Load all referenced not-deleted objects.
ids_to_query = [trx.record_id for trx in latest_trxs
if trx.command != 'delete']
object_cls = transaction_objects()[obj_type]
if object_cls == Account:
# The base query for Account queries the /Namespace/ table
# since the API-returned "`account`" is a `namespace`
# under-the-hood.
query = db_session.query(Namespace).join(Account).filter(
Account.id.in_(ids_to_query),
Namespace.id == namespace.id)
# Key by /namespace.account_id/ --
# namespace.id may not be equal to account.id
# and trx.record_id == account.id for `account` trxs.
objects = {obj.account_id: obj for obj in query}
else:
query = db_session.query(object_cls).filter(
object_cls.id.in_(ids_to_query),
object_cls.namespace_id == namespace.id)
if object_cls == Thread:
query = query.options(*Thread.api_loading_options(expand))
elif object_cls == Message:
query = query.options(*Message.api_loading_options(expand))
objects = {obj.id: obj for obj in query}
for trx in latest_trxs:
delta = {
'object': trx.object_type,
'event': EVENT_NAME_FOR_COMMAND[trx.command],
'id': trx.object_public_id,
'cursor': trx.public_id
}
if trx.command != 'delete':
obj = objects.get(trx.record_id)
if obj is None:
continue
repr_ = encode(
obj, namespace_public_id=namespace.public_id,
expand=expand)
delta['attributes'] = repr_
results.append((trx.id, delta))
if results:
# Sort deltas by id of the underlying transactions.
results.sort()
deltas = [d for _, d in results]
return (deltas, results[-1][0])
else:
# It's possible that none of the referenced objects exist any more,
# meaning the result list is empty. In that case, keep traversing
# the log until we get actual results or reach the end.
pointer = transactions[-1].id
def format_transactions_after_pointer(namespace,
pointer,
db_session,
result_limit,
exclude_types=None,
include_types=None,
exclude_folders=True,
expand=False):
"""
Return a pair (deltas, new_pointer), where deltas is a list of change
events, represented as dictionaries:
{
"object": <API object type, e.g. "thread">,
"event": <"create", "modify", or "delete>,
"attributes": <API representation of the object for insert/update events>
"cursor": <public_id of the transaction>
}
and new_pointer is the integer id of the last included transaction
Arguments
---------
namespace_id: int
Id of the namespace for which to get changes.
pointer: int
Process transactions starting after this id.
db_session: new_session
database session
result_limit: int
Maximum number of results to return. (Because we may roll up multiple
changes to the same object, fewer results can be returned.)
format_transaction_fn: function pointer
Function that defines how to format the transactions.
exclude_types: list, optional
If given, don't include transactions for these types of objects.
"""
exclude_types = set(exclude_types) if exclude_types else set()
# Begin backwards-compatibility shim -- suppress new object types for now,
# because clients may not be able to deal with them.
exclude_types.add('account')
if exclude_folders is True:
exclude_types.update(('folder', 'label'))
# End backwards-compatibility shim.
last_trx = _get_last_trx_id_for_namespace(namespace.id, db_session)
if last_trx == pointer:
return ([], pointer)
while True:
# deleted_at condition included to allow this query to be satisfied via
# the legacy index on (namespace_id, deleted_at) for performance.
# Also need to explicitly specify the index hint because the query
# planner is dumb as nails and otherwise would make this super slow for
# some values of namespace_id and pointer.
# TODO(emfree): Remove this hack and ensure that the right index (on
# namespace_id only) exists.
transactions = db_session.query(Transaction). \
filter(
Transaction.id > pointer,
Transaction.namespace_id == namespace.id,
Transaction.deleted_at.is_(None)). \
with_hint(Transaction, 'USE INDEX (namespace_id_deleted_at)')
if exclude_types is not None:
transactions = transactions.filter(
~Transaction.object_type.in_(exclude_types))
if include_types is not None:
transactions = transactions.filter(
Transaction.object_type.in_(include_types))
transactions = transactions. \
order_by(asc(Transaction.id)).limit(result_limit).all()
if not transactions:
return ([], pointer)
results = []
# Group deltas by object type.
trxs_by_obj_type = collections.defaultdict(list)
for trx in transactions:
trxs_by_obj_type[trx.object_type].append(trx)
for obj_type, trxs in trxs_by_obj_type.items():
# Build a dictionary mapping pairs (record_id, command) to
# transaction. If successive modifies for a given record id appear
# in the list of transactions, this will only keep the latest
# one (which is what we want).
latest_trxs = {(trx.record_id, trx.command): trx
for trx in sorted(trxs, key=lambda t: t.id)
}.values()
# Load all referenced not-deleted objects.
ids_to_query = [
trx.record_id for trx in latest_trxs if trx.command != 'delete'
]
object_cls = transaction_objects()[obj_type]
query = db_session.query(object_cls).filter(
object_cls.id.in_(ids_to_query),
object_cls.namespace_id == namespace.id)
if object_cls == Thread:
query = query.options(*Thread.api_loading_options(expand))
elif object_cls == Message:
query = query.options(*Message.api_loading_options(expand))
objects = {obj.id: obj for obj in query}
for trx in latest_trxs:
delta = {
'object': trx.object_type,
'event': EVENT_NAME_FOR_COMMAND[trx.command],
'id': trx.object_public_id,
'cursor': trx.public_id
}
if trx.command != 'delete':
obj = objects.get(trx.record_id)
if obj is None:
continue
repr_ = encode(obj,
namespace_public_id=namespace.public_id,
expand=expand)
delta['attributes'] = repr_
results.append((trx.id, delta))
if results:
# Sort deltas by id of the underlying transactions.
results.sort()
deltas = [d for _, d in results]
return (deltas, results[-1][0])
else:
# It's possible that none of the referenced objects exist any more,
# meaning the result list is empty. In that case, keep traversing
# the log until we get actual results or reach the end.
pointer = transactions[-1].id
def format_transactions_after_pointer(namespace,
pointer,
db_session,
result_limit,
exclude_types=None,
include_types=None,
exclude_folders=True,
exclude_metadata=True,
exclude_account=True,
expand=False,
is_n1=False):
"""
Return a pair (deltas, new_pointer), where deltas is a list of change
events, represented as dictionaries:
{
"object": <API object type, e.g. "thread">,
"event": <"create", "modify", or "delete>,
"attributes": <API representation of the object for insert/update events>
"cursor": <public_id of the transaction>
}
and new_pointer is the integer id of the last included transaction
Arguments
---------
namespace_id: int
Id of the namespace for which to get changes.
pointer: int
Process transactions starting after this id.
db_session: new_session
database session
result_limit: int
Maximum number of results to return. (Because we may roll up multiple
changes to the same object, fewer results can be returned.)
format_transaction_fn: function pointer
Function that defines how to format the transactions.
exclude_types: list, optional
If given, don't include transactions for these types of objects.
"""
exclude_types = set(exclude_types) if exclude_types else set()
# Begin backwards-compatibility shim -- suppress new object types for now,
# because clients may not be able to deal with them.
if exclude_folders is True:
exclude_types.update(('folder', 'label'))
if exclude_account is True:
exclude_types.add('account')
# End backwards-compatibility shim.
# Metadata is excluded by default, and can only be included by setting the
# exclude_metadata flag to False. If listed in include_types, remove it.
if exclude_metadata is True:
exclude_types.add('metadata')
if include_types is not None and 'metadata' in include_types:
include_types.remove('metadata')
last_trx = _get_last_trx_id_for_namespace(namespace.id, db_session)
if last_trx == pointer:
return ([], pointer)
while True:
transactions = db_session.query(Transaction). \
filter(
Transaction.id > pointer,
Transaction.namespace_id == namespace.id)
if exclude_types is not None:
transactions = transactions.filter(
~Transaction.object_type.in_(exclude_types))
if include_types is not None:
transactions = transactions.filter(
Transaction.object_type.in_(include_types))
transactions = transactions. \
order_by(asc(Transaction.id)).limit(result_limit).all()
if not transactions:
return ([], pointer)
results = []
# Group deltas by object type.
trxs_by_obj_type = collections.defaultdict(list)
for trx in transactions:
trxs_by_obj_type[trx.object_type].append(trx)
for obj_type, trxs in trxs_by_obj_type.items():
# Build a dictionary mapping pairs (record_id, command) to
# transaction. If successive modifies for a given record id appear
# in the list of transactions, this will only keep the latest
# one (which is what we want).
latest_trxs = {(trx.record_id, trx.command): trx
for trx in sorted(trxs, key=lambda t: t.id)
}.values()
# Load all referenced not-deleted objects.
ids_to_query = [
trx.record_id for trx in latest_trxs if trx.command != 'delete'
]
object_cls = transaction_objects()[obj_type]
if object_cls == Account:
# The base query for Account queries the /Namespace/ table
# since the API-returned "`account`" is a `namespace`
# under-the-hood.
query = db_session.query(Namespace).join(Account).filter(
Account.id.in_(ids_to_query), Namespace.id == namespace.id)
# Key by /namespace.account_id/ --
# namespace.id may not be equal to account.id
# and trx.record_id == account.id for `account` trxs.
objects = {obj.account_id: obj for obj in query}
else:
query = db_session.query(object_cls).filter(
object_cls.id.in_(ids_to_query),
object_cls.namespace_id == namespace.id)
if object_cls == Thread:
query = query.options(*Thread.api_loading_options(expand))
elif object_cls == Message:
query = query.options(*Message.api_loading_options(expand))
objects = {obj.id: obj for obj in query}
for trx in latest_trxs:
delta = {
'object': trx.object_type,
'event': EVENT_NAME_FOR_COMMAND[trx.command],
'id': trx.object_public_id,
'cursor': trx.public_id
}
if trx.command != 'delete':
obj = objects.get(trx.record_id)
if obj is None:
continue
repr_ = encode(obj,
namespace_public_id=namespace.public_id,
expand=expand,
is_n1=is_n1)
delta['attributes'] = repr_
results.append((trx.id, delta))
if results:
# Sort deltas by id of the underlying transactions.
results.sort()
deltas = [d for _, d in results]
return (deltas, results[-1][0])
else:
# It's possible that none of the referenced objects exist any more,
# meaning the result list is empty. In that case, keep traversing
# the log until we get actual results or reach the end.
pointer = transactions[-1].id