def create(self, project_id): tr = self._db.create_transaction() tx_dir = yield self._tx_metadata(tr, project_id) scatter_val = random.randint(0, 15) tr.set_versionstamped_key(tx_dir.encode_start_key(scatter_val), b'') versionstamp_future = tr.get_versionstamp() yield self._tornado_fdb.commit(tr) txid = TransactionID.encode(scatter_val, versionstamp_future.wait().value) raise gen.Return(txid)
def get_metadata(self, tr, project_id, txid):
tx_dir = yield self._tx_metadata(tr, project_id)
results = yield ResultIterator(tr, self._tornado_fdb,
tx_dir.get_txid_slice(txid)).list()
scatter_val, tx_start_versionstamp = TransactionID.decode(txid)
if (not results or
results[0].key != tx_dir.encode_start_key(scatter_val,
tx_start_versionstamp)):
raise BadRequest(u'Transaction not found')
raise gen.Return(tx_dir.decode_metadata(txid, results[1:]))
def apply_txn_changes(self, project_id, txid, retries=5):
logger.debug(u'Applying {}:{}'.format(project_id, txid))
project_id = decode_str(project_id)
tr = self._db.create_transaction()
read_versionstamp = TransactionID.decode(txid)[1]
lookups, queried_groups, mutations = yield self._tx_manager.get_metadata(
tr, project_id, txid)
try:
writes = yield self._apply_mutations(tr, project_id,
queried_groups, mutations,
lookups, read_versionstamp)
finally:
yield self._tx_manager.delete(tr, project_id, txid)
versionstamp_future = None
old_entries = [
old_entry for old_entry, _, _ in writes if old_entry.present
]
if old_entries:
versionstamp_future = tr.get_versionstamp()
try:
yield self._tornado_fdb.commit(tr, convert_exceptions=False)
except fdb.FDBError as fdb_error:
if fdb_error.code != FDBErrorCodes.NOT_COMMITTED:
raise InternalError(fdb_error.description)
retries -= 1
if retries < 0:
raise InternalError(fdb_error.description)
yield self.apply_txn_changes(project_id, txid, retries)
return
if old_entries:
self._gc.clear_later(old_entries, versionstamp_future.wait().value)
mutations = [(old_entry, FDBDatastore._filter_version(new_entry),
index_stats)
for old_entry, new_entry, index_stats in writes
if index_stats is not None]
IOLoop.current().spawn_callback(self._stats_buffer.update, project_id,
mutations)
logger.debug(u'Finished applying {}:{}'.format(project_id, txid))
def dynamic_get(self, project_id, get_request, get_response):
logger.debug(u'get_request:\n{}'.format(get_request))
project_id = decode_str(project_id)
tr = self._db.create_transaction()
read_versionstamp = None
if get_request.has_transaction():
yield self._tx_manager.log_lookups(tr, project_id, get_request)
# Ensure the GC hasn't cleaned up an entity written after the tx start.
safe_read_stamps = yield [
self._gc.safe_read_versionstamp(tr, key)
for key in get_request.key_list()
]
safe_read_stamps = [
vs for vs in safe_read_stamps if vs is not None
]
read_versionstamp = TransactionID.decode(
get_request.transaction().handle())[1]
if any(safe_versionstamp > read_versionstamp
for safe_versionstamp in safe_read_stamps):
raise BadRequest(u'The specified transaction has expired')
futures = []
for key in get_request.key_list():
futures.append(
self._data_manager.get_latest(tr,
key,
read_versionstamp,
snapshot=True))
version_entries = yield futures
# If this read is in a transaction, logging the RPC is a mutation.
yield self._tornado_fdb.commit(tr)
for entry in version_entries:
response_entity = get_response.add_entity()
response_entity.set_version(entry.version)
if entry.has_entity:
response_entity.mutable_entity().MergeFrom(entry.decoded)
else:
response_entity.mutable_key().MergeFrom(entry.key)
logger.debug(u'fetched paths: {}'.format(
[entry.path for entry in version_entries if entry.has_entity]))
def apply_txn_changes(self, project_id, txid, retries=5):
logger.debug(u'Applying {}:{}'.format(project_id, txid))
project_id = decode_str(project_id)
tr = self._db.create_transaction()
read_versionstamp = TransactionID.decode(txid)[1]
lookups, queried_groups, mutations = yield self._tx_manager.get_metadata(
tr, project_id, txid)
try:
old_entries = yield self._apply_mutations(tr, project_id,
queried_groups,
mutations, lookups,
read_versionstamp)
finally:
yield self._tx_manager.delete(tr, project_id, txid)
versionstamp_future = None
if old_entries:
versionstamp_future = tr.get_versionstamp()
try:
yield self._tornado_fdb.commit(tr, convert_exceptions=False)
except fdb.FDBError as fdb_error:
if fdb_error.code != FDBErrorCodes.NOT_COMMITTED:
raise InternalError(fdb_error.description)
retries -= 1
if retries < 0:
raise InternalError(fdb_error.description)
yield self.apply_txn_changes(project_id, txid, retries)
return
if old_entries:
self._gc.clear_later(old_entries, versionstamp_future.wait().value)
logger.debug(u'Finished applying {}:{}'.format(project_id, txid))
def _txid_prefix(self, txid):
scatter_val, commit_versionstamp = TransactionID.decode(txid)
return (self.directory.rawPrefix + six.int2byte(scatter_val) +
commit_versionstamp)
def _dynamic_run_query(self, query, query_result):
logger.debug(u'query: {}'.format(query))
project_id = decode_str(query.app())
tr = self._db.create_transaction()
read_versionstamp = None
if query.has_transaction():
yield self._tx_manager.log_query(tr, project_id, query)
# Ensure the GC hasn't cleaned up an entity written after the tx start.
safe_versionstamp = yield self._gc.safe_read_versionstamp(
tr, query.ancestor())
read_versionstamp = TransactionID.decode(
query.transaction().handle())[1]
if (safe_versionstamp is not None
and safe_versionstamp > read_versionstamp):
raise BadRequest(u'The specified transaction has expired')
fetch_data = self._index_manager.include_data(query)
rpc_limit, check_more_results = self._index_manager.rpc_limit(query)
iterator = yield self._index_manager.get_iterator(
tr, query, read_versionstamp)
for prop_name in query.property_name_list():
prop_name = decode_str(prop_name)
if prop_name not in iterator.prop_names:
raise BadRequest(
u'Projections on {} are not supported'.format(prop_name))
data_futures = [] if fetch_data else None
unique_keys = set()
results = []
entries_fetched = 0
skipped_results = 0
cursor = None
while True:
remainder = rpc_limit - entries_fetched
iter_offset = max(query.offset() - entries_fetched, 0)
entries, more_iterator_results = yield iterator.next_page()
entries_fetched += len(entries)
if not entries and more_iterator_results:
continue
if not entries and not more_iterator_results:
break
skipped_results += min(len(entries), iter_offset)
suitable_entries = entries[iter_offset:remainder]
if entries[:remainder]:
cursor = entries[:remainder][-1]
if not fetch_data and not query.keys_only():
results.extend(
[entry.prop_result() for entry in suitable_entries])
continue
for entry in suitable_entries:
if entry.path in unique_keys:
continue
unique_keys.add(entry.path)
if fetch_data:
data_futures.append(
self._data_manager.get_entry(tr, entry, snapshot=True))
else:
results.append(entry.key_result())
if not more_iterator_results:
break
if fetch_data:
entity_results = yield data_futures
results = [entity.encoded for entity in entity_results]
else:
results = [result.Encode() for result in results]
yield self._tornado_fdb.commit(tr)
query_result.result_list().extend(results)
# TODO: Figure out how ndb multi queries use compiled cursors.
if query.compile():
ordered_props = tuple(prop_name
for prop_name, _ in get_order_info(query)
if prop_name != KEY_PROP)
mutable_cursor = query_result.mutable_compiled_cursor()
if cursor is not None:
mutable_cursor.MergeFrom(cursor.cursor_result(ordered_props))
more_results = check_more_results and entries_fetched > rpc_limit
query_result.set_more_results(more_results)
if skipped_results:
query_result.set_skipped_results(skipped_results)
if query.keys_only():
query_result.set_keys_only(True)
logger.debug(u'{} results'.format(len(query_result.result_list())))