[source] implement storages right in the source rather than in hooks
The problem is that Storage objects will most probably change entity's
dictionary so that values are correctly set before the source's
corresponding method (e.g. entity_added()) is called.
For instance, the BFSFileStorage will change the original binary
data and replace it with the destination file path in order to store
the file path in the database. This change must be local
to the source in order not to impact other hooks or attribute access
during the transaction, the whole idea being that the same
application code should work exactly the same whether or not a
BFSStorage is used or not.
typemap = repo.system_source.dbhelper.TYPE_MAPPING
sqls = """
CREATE TABLE transactions (
tx_uuid CHAR(32) PRIMARY KEY NOT NULL,
tx_user INTEGER NOT NULL,
tx_time %s NOT NULL
);;
CREATE INDEX transactions_tx_user_idx ON transactions(tx_user);;
CREATE TABLE tx_entity_actions (
tx_uuid CHAR(32) REFERENCES transactions(tx_uuid) ON DELETE CASCADE,
txa_action CHAR(1) NOT NULL,
txa_public %s NOT NULL,
txa_order INTEGER,
eid INTEGER NOT NULL,
etype VARCHAR(64) NOT NULL,
changes %s
);;
CREATE INDEX tx_entity_actions_txa_action_idx ON tx_entity_actions(txa_action);;
CREATE INDEX tx_entity_actions_txa_public_idx ON tx_entity_actions(txa_public);;
CREATE INDEX tx_entity_actions_eid_idx ON tx_entity_actions(eid);;
CREATE INDEX tx_entity_actions_etype_idx ON tx_entity_actions(etype);;
CREATE TABLE tx_relation_actions (
tx_uuid CHAR(32) REFERENCES transactions(tx_uuid) ON DELETE CASCADE,
txa_action CHAR(1) NOT NULL,
txa_public %s NOT NULL,
txa_order INTEGER,
eid_from INTEGER NOT NULL,
eid_to INTEGER NOT NULL,
rtype VARCHAR(256) NOT NULL
);;
CREATE INDEX tx_relation_actions_txa_action_idx ON tx_relation_actions(txa_action);;
CREATE INDEX tx_relation_actions_txa_public_idx ON tx_relation_actions(txa_public);;
CREATE INDEX tx_relation_actions_eid_from_idx ON tx_relation_actions(eid_from);;
CREATE INDEX tx_relation_actions_eid_to_idx ON tx_relation_actions(eid_to)
""" % (typemap['Datetime'],
typemap['Boolean'], typemap['Bytes'], typemap['Boolean'])
for statement in sqls.split(';;'):
sql(statement)