def test_create_message():
addstuff()
changestuff()
session = Session()
message = PushMessage()
message.add_unversioned_operations()
message.set_node(session.query(models.Node).first())
assert message.to_json() == PushMessage(message.to_json()).to_json()
def test_encode_message():
addstuff()
changestuff()
session = Session()
message = PushMessage()
message.add_unversioned_operations()
message.set_node(session.query(models.Node).first())
assert message.to_json() == json.loads(json.dumps(message.to_json()))
def test_sign_message():
addstuff()
changestuff()
session = Session()
message = PushMessage()
message.set_node(session.query(models.Node).first())
message.add_unversioned_operations()
assert message.islegit(session)
message.key += "broken"
assert not message.islegit(session)
def request_push(
push_url, extra_data=None, encode=None, decode=None, headers=None, timeout=None, extensions=True, session=None
):
message = PushMessage()
message.latest_version_id = core.get_latest_version_id(session=session)
compress(session=session)
message.add_unversioned_operations(session=session, include_extensions=extensions)
message.set_node(session.query(Node).order_by(Node.node_id.desc()).first())
data = message.to_json()
data.update({"extra_data": extra_data or {}})
code, reason, response = post_request(push_url, data, encode, decode, headers, timeout)
if (code // 100 != 2) or response is None:
if suggests_pull is not None and suggests_pull(code, reason, response):
raise PullSuggested(code, reason, response)
raise PushRejected(code, reason, response)
new_version_id = response.get("new_version_id")
if new_version_id is None:
raise PushRejected(code, reason, {"error": "server didn't respond with new version id", "response": response})
# Who should set the dates? Maybe send a complete Version from the
# server. For now the field is ignored, so it doesn't matter.
session.add(Version(version_id=new_version_id, created=datetime.datetime.now()))
for op in message.operations:
op.version_id = new_version_id
# return the response for the programmer to do what she wants
# afterwards
return response
def test_encode_message():
addstuff()
changestuff()
session = Session()
message = PushMessage()
message.add_unversioned_operations()
message.set_node(session.query(models.Node).first())
assert message.to_json() == json.loads(json.dumps(message.to_json()))
def test_create_message():
addstuff()
changestuff()
session = Session()
message = PushMessage()
message.add_unversioned_operations()
message.set_node(session.query(models.Node).first())
assert message.to_json() == PushMessage(message.to_json()).to_json()
def create_push_message(self,
session: Optional[
sqlalchemy.orm.session.Session] = None,
extensions=True,
do_compress=True) -> PushMessage:
# TODO: mit do_compress=True muss noch getestet werden, welche Szenarien die referentielle Integritaet
# verletzen koennen. Denn wenn die Tabellen in richtiger Reihenfolge synchronisiert werden
# koennte man auf das Aussetzen der RI verzichten
if not session:
session = self.Session() # TODO: p
# breakpoint()
message = PushMessage()
message.latest_version_id = core.get_latest_version_id(session=session)
if do_compress:
compress(session=session)
message.add_unversioned_operations(session=session,
include_extensions=extensions)
return message
def test_sign_message():
addstuff()
changestuff()
session = Session()
message = PushMessage()
message.set_node(session.query(models.Node).first())
message.add_unversioned_operations()
assert message.islegit(session)
message.key += "broken"
assert not message.islegit(session)
def request_push(push_url: str,
extra_data=None,
encode=None,
decode=None,
headers=None,
timeout=None,
extensions=True,
session=None) -> Dict[str, Any]:
message = PushMessage()
message.latest_version_id = core.get_latest_version_id(session=session)
compress(session=session)
message.add_unversioned_operations(session=session,
include_extensions=extensions)
if not message.operations:
return {}
message.set_node(session.query(Node).order_by(Node.node_id.desc()).first())
data = message.to_json()
data.update({'extra_data': extra_data or {}})
code, reason, response = post_request(push_url, data, encode, decode,
headers, timeout)
if (code // 100 != 2) or response is None:
if suggests_pull is not None and suggests_pull(code, reason, response):
raise PullSuggested(code, reason, response)
raise PushRejected(code, reason, response)
new_version_id = response.get('new_version_id')
if new_version_id is None:
raise PushRejected(
code, reason, {
'error': "server didn't respond with new version id",
'response': response
})
# Who should set the dates? Maybe send a complete Version from the
# server. For now the field is ignored, so it doesn't matter.
session.add(
Version(version_id=new_version_id, created=datetime.datetime.now()))
for op in message.operations:
op.version_id = new_version_id
# return the response for the programmer to do what she wants
# afterwards
return response
async def handle_push(connection: Connection,
session: sqlalchemy.orm.Session) -> Optional[int]:
msgs_got = 0
version: Optional[Version] = None
async for msg in connection.socket:
msgs_got += 1
msg_json = json.loads(msg)
pushmsg = PushMessage(msg_json)
# print(f"pushmsg: {msg}")
if not pushmsg.operations:
logger.warn("empty operations list in client PushMessage")
for op in pushmsg.operations:
logger.info(f"operation: {op}")
# await connection.socket.send(f"answer is:{msg}")
logger.info(f"message key={pushmsg.key}")
latest_version_id = core.get_latest_version_id(session=session)
logger.info(
f"** version on server:{latest_version_id}, version in pushmsg:{pushmsg.latest_version_id}"
)
if latest_version_id != pushmsg.latest_version_id:
exc = f"version identifier isn't the latest one; " \
f"incoming: {pushmsg.latest_version_id}, on server:{latest_version_id}"
if latest_version_id is None:
logger.warn(exc)
raise PushRejected(exc)
if pushmsg.latest_version_id is None:
logger.warn(exc)
raise PullSuggested(exc)
if pushmsg.latest_version_id < latest_version_id:
logger.warn(exc)
raise PullSuggested(exc)
raise PushRejected(exc)
if not pushmsg.islegit(session):
raise PushRejected("message isn't properly signed")
for listener in before_push:
listener(session, pushmsg)
# I) detect unique constraint conflicts and resolve them if possible
unique_conflicts = find_unique_conflicts(pushmsg, session)
conflicting_objects = set()
for uc in unique_conflicts:
obj = uc['object']
conflicting_objects.add(obj)
for key, value in zip(uc['columns'], uc['new_values']):
setattr(obj, key, value)
for obj in conflicting_objects:
make_transient(obj) # remove from session
for model in set(type(obj) for obj in conflicting_objects):
pk_name = get_pk(model)
pks = [
getattr(obj, pk_name) for obj in conflicting_objects
if type(obj) is model
]
session.query(model).filter(getattr(model, pk_name).in_(pks)). \
delete(synchronize_session=False) # remove from the database
session.add_all(conflicting_objects) # reinsert
session.flush()
# II) perform the operations
operations = [
o for o in pushmsg.operations if o.tracked_model is not None
]
post_operations: List[Tuple[Operation, SQLClass,
Optional[SQLClass]]] = []
try:
op: Operation
for op in operations:
(obj,
old_obj) = await op.perform_async(pushmsg, session,
pushmsg.node_id,
connection.socket)
if obj is not None:
# if the op has been skipped, it wont be appended for post_operation handling
post_operations.append((op, obj, old_obj))
resp = dict(type="info",
op=dict(
row_id=op.row_id,
version=op.version,
command=op.command,
content_type_id=op.content_type_id,
))
call_after_tracking_fn(session, op, obj)
await connection.socket.send(json.dumps(resp))
except OperationError as e:
logger.exception(
"Couldn't perform operation in push from node %s.",
pushmsg.node_id)
raise PushRejected("at least one operation couldn't be performed",
*e.args)
# III) insert a new version
if post_operations: # only if operations have been done -> create the new version
version = Version(created=datetime.datetime.now(),
node_id=pushmsg.node_id)
session.add(version)
# IV) insert the operations, discarding the 'order' column
accomplished_operations = [
op for (op, obj, old_obj) in post_operations
]
for op in sorted(accomplished_operations, key=attr('order')):
new_op = Operation()
for k in [k for k in properties_dict(op) if k != 'order']:
setattr(new_op, k, getattr(op, k))
session.add(new_op)
new_op.version = version
session.flush()
for op, obj, old_obj in post_operations:
op.call_after_operation_fn(session, obj, old_obj)
# from woodmaster.model.sql.model import WoodPile, Measurement
# orphans = session.query(Measurement).filter(Measurement.woodpile_id == None).all()
# print(f"orphans:{orphans}")
for listener in after_push:
listener(session, pushmsg)
# return the new version id back to the client
logger.info(f"version is: {version}")
if version:
await connection.socket.send(
json.dumps(
dict(type="result", new_version_id=version.version_id)))
return {'new_version_id': version.version_id}
else:
await connection.socket.send(
json.dumps(dict(type="result", new_version_id=None)))
logger.info("sent nothing message")
await connection.socket.close()
logger.info("push ready")
def handle_push(data: Dict[str, Any],
session: Optional[Session] = None) -> Dict[str, int]:
"""
Handle the push request and return a dictionary object to be sent
back to the node.
If the push is rejected, this procedure will raise a
dbsync.server.handlers.PushRejected exception.
*data* must be a dictionary-like object, usually the product of
parsing a JSON string.
"""
message: PushMessage
try:
message = PushMessage(data)
except KeyError:
raise PushRejected("request object isn't a valid PushMessage", data)
latest_version_id = core.get_latest_version_id(session=session)
if latest_version_id != message.latest_version_id:
exc = "version identifier isn't the latest one; "\
"given: %s" % message.latest_version_id
if latest_version_id is None:
raise PushRejected(exc)
if message.latest_version_id is None:
raise PullSuggested(exc)
if message.latest_version_id < latest_version_id:
raise PullSuggested(exc)
raise PushRejected(exc)
if not message.operations:
return {}
# raise PushRejected("message doesn't contain operations")
if not message.islegit(session):
raise PushRejected("message isn't properly signed")
for listener in before_push:
listener(session, message)
# I) detect unique constraint conflicts and resolve them if possible
unique_conflicts = find_unique_conflicts(message, session)
conflicting_objects = set()
for uc in unique_conflicts:
obj = uc['object']
conflicting_objects.add(obj)
for key, value in zip(uc['columns'], uc['new_values']):
setattr(obj, key, value)
for obj in conflicting_objects:
make_transient(obj) # remove from session
for model in set(type(obj) for obj in conflicting_objects):
pk_name = get_pk(model)
pks = [
getattr(obj, pk_name) for obj in conflicting_objects
if type(obj) is model
]
session.query(model).filter(getattr(model, pk_name).in_(pks)).\
delete(synchronize_session=False) # remove from the database
session.add_all(conflicting_objects) # reinsert
session.flush()
# II) perform the operations
operations = [o for o in message.operations if o.tracked_model is not None]
try:
for op in operations:
op.perform(message, session, message.node_id)
except OperationError as e:
logger.exception("Couldn't perform operation in push from node %s.",
message.node_id)
raise PushRejected("at least one operation couldn't be performed",
*e.args)
# III) insert a new version
version = Version(created=datetime.datetime.now(), node_id=message.node_id)
session.add(version)
# IV) insert the operations, discarding the 'order' column
for op in sorted(operations, key=attr('order')):
new_op = Operation()
for k in [k for k in properties_dict(op) if k != 'order']:
setattr(new_op, k, getattr(op, k))
session.add(new_op)
new_op.version = version
session.flush()
for listener in after_push:
listener(session, message)
# return the new version id back to the node
return {'new_version_id': version.version_id}
def handle_push(data, session=None):
"""
Handle the push request and return a dictionary object to be sent
back to the node.
If the push is rejected, this procedure will raise a
dbsync.server.handlers.PushRejected exception.
*data* must be a dictionary-like object, usually the product of
parsing a JSON string.
"""
message = None
try:
message = PushMessage(data)
except KeyError:
raise PushRejected("request object isn't a valid PushMessage", data)
latest_version_id = core.get_latest_version_id(session=session)
if latest_version_id != message.latest_version_id:
exc = "version identifier isn't the latest one; "\
"given: %s" % message.latest_version_id
if latest_version_id is None:
raise PushRejected(exc)
if message.latest_version_id is None:
raise PullSuggested(exc)
if message.latest_version_id < latest_version_id:
raise PullSuggested(exc)
raise PushRejected(exc)
if not message.operations:
raise PushRejected("message doesn't contain operations")
if not message.islegit(session):
raise PushRejected("message isn't properly signed")
for listener in before_push:
listener(session, message)
# I) detect unique constraint conflicts and resolve them if possible
unique_conflicts = find_unique_conflicts(message, session)
conflicting_objects = set()
for uc in unique_conflicts:
obj = uc['object']
conflicting_objects.add(obj)
for key, value in izip(uc['columns'], uc['new_values']):
setattr(obj, key, value)
for obj in conflicting_objects:
make_transient(obj) # remove from session
for model in set(type(obj) for obj in conflicting_objects):
pk_name = get_pk(model)
pks = [getattr(obj, pk_name)
for obj in conflicting_objects
if type(obj) is model]
session.query(model).filter(getattr(model, pk_name).in_(pks)).\
delete(synchronize_session=False) # remove from the database
session.add_all(conflicting_objects) # reinsert
session.flush()
# II) perform the operations
operations = filter(lambda o: o.tracked_model is not None, message.operations)
try:
for op in operations:
op.perform(message, session, message.node_id)
except OperationError as e:
logger.exception(u"Couldn't perform operation in push from node %s.",
message.node_id)
raise PushRejected("at least one operation couldn't be performed",
*e.args)
# III) insert a new version
version = Version(created=datetime.datetime.now(), node_id=message.node_id)
session.add(version)
# IV) insert the operations, discarding the 'order' column
for op in sorted(operations, key=attr('order')):
new_op = Operation()
for k in ifilter(lambda k: k != 'order', properties_dict(op)):
setattr(new_op, k, getattr(op, k))
session.add(new_op)
new_op.version = version
session.flush()
for listener in after_push:
listener(session, message)
# return the new version id back to the node
return {'new_version_id': version.version_id}
