def cachingToRedis():
## caching the data into redis meomory and delet it after 60 sec
context = pa.default_serialization_context()
redis.set('key',
context.serialize(scrapes_BTC_Data()).to_buffer().to_pybytes())
redis.expire('key', 60)
return context
def _df_from_redis(self, key):
buffer = self._config.redis.get(key)
if buffer is not None:
context = pa.default_serialization_context()
return context.deserialize(buffer)
else:
return None
def test_serialize_subclasses():
# This test shows how subclasses can be handled in an idiomatic way
# by having only a serializer for the base class
# This technique should however be used with care, since pickling
# type(obj) with couldpickle will include the full class definition
# in the serialized representation.
# This means the class definition is part of every instance of the
# object, which in general is not desirable; registering all subclasses
# with register_type will result in faster and more memory
# efficient serialization.
context = pa.default_serialization_context()
context.register_type(Serializable,
"Serializable",
custom_serializer=serialize_serializable,
custom_deserializer=deserialize_serializable)
a = SerializableClass()
serialized = pa.serialize(a, context=context)
deserialized = serialized.deserialize(context=context)
assert type(deserialized).__name__ == SerializableClass.__name__
assert deserialized.value == 3
def test_serialize_subclasses():
# This test shows how subclasses can be handled in an idiomatic way
# by having only a serializer for the base class
# This technique should however be used with care, since pickling
# type(obj) with couldpickle will include the full class definition
# in the serialized representation.
# This means the class definition is part of every instance of the
# object, which in general is not desirable; registering all subclasses
# with register_type will result in faster and more memory
# efficient serialization.
context = pa.default_serialization_context()
context.register_type(
Serializable, "Serializable",
custom_serializer=serialize_serializable,
custom_deserializer=deserialize_serializable)
a = SerializableClass()
serialized = pa.serialize(a, context=context)
deserialized = serialized.deserialize(context=context)
assert type(deserialized).__name__ == SerializableClass.__name__
assert deserialized.value == 3
def fetchHospital(rconn, key):
context = pyarrow.default_serialization_context()
#
# See: https://dev.socrata.com/foundry/healthdata.gov/g62h-syeh
#
#
# Check date of main dataframe
#
expires = rconn.hget("statehos" + key, "expires")
if expires and time.time() < float(expires):
return context.deserialize(rconn.hget("statehos" + key, "dataframe"))
#
# Fetch
# Make sure we include a user agent. We are limited to 50,000 records per query,
# but that should be plenty for this table (which has rows per day)
#
# The HHS sure loves long column names...
#
columns = [
'date',
'state',
'inpatient_beds',
'inpatient_beds_used',
'inpatient_beds_used_covid',
'staffed_icu_adult_patients_confirmed_and_suspected_covid',
'total_staffed_adult_icu_beds',
]
req = requests.get(
"https://healthdata.gov/resource/g62h-syeh.csv",
params={
'state': key,
'$limit': 5000,
'$select': ",".join(columns),
"$$app_token": app.config['SOCRATA_TOKEN']
},
headers={
'User-Agent':
'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:77.0) Gecko/20100101 Firefox/77.0'
})
if req.status_code != 200:
raise Exception("Request failure: {}".format(req.status_code))
answer = pd.read_csv(StringIO(req.text),
parse_dates=["date"]).rename(columns={'date': 'dt'})
answer = answer.sort_values('dt')
#
# Save
#
rconn.hset("statehos" + key, "dataframe",
context.serialize(answer).to_buffer().to_pybytes())
rconn.hset("statehos" + key, "expires", str(time.time() + 600.0))
return answer
def _serialize_and_expand_data(
result_set: SupersetResultSet,
db_engine_spec: BaseEngineSpec,
use_msgpack: Optional[bool] = False,
expand_data: bool = False,
) -> Tuple[Union[bytes, str], List[Any], List[Any], List[Any]]:
selected_columns = result_set.columns
all_columns: List[Any]
expanded_columns: List[Any]
if use_msgpack:
with stats_timing("sqllab.query.results_backend_pa_serialization",
stats_logger):
data = (pa.default_serialization_context().serialize(
result_set.pa_table).to_buffer().to_pybytes())
# expand when loading data from results backend
all_columns, expanded_columns = (selected_columns, [])
else:
df = result_set.to_pandas_df()
data = df_to_records(df) or []
if expand_data:
all_columns, data, expanded_columns = db_engine_spec.expand_data(
selected_columns, data)
else:
all_columns = selected_columns
expanded_columns = []
return (data, selected_columns, all_columns, expanded_columns)
def mars_serialize_context():
global _serialize_context
if _serialize_context is None:
ctx = pyarrow.default_serialization_context()
ctx.register_type(SparseNDArray,
'mars.SparseNDArray',
custom_serializer=_serialize_sparse_nd_array,
custom_deserializer=_deserialize_sparse_nd_array)
ctx.register_type(GroupByWrapper,
'pandas.GroupByWrapper',
custom_serializer=_serialize_groupby_wrapper,
custom_deserializer=_deserialize_groupby_wrapper)
ctx.register_type(pd.Interval,
'pandas.Interval',
custom_serializer=_serialize_pandas_interval,
custom_deserializer=_deserialize_pandas_interval)
ctx.register_type(pd.Categorical,
'pandas.Categorical',
custom_serializer=_serialze_pandas_categorical,
custom_deserializer=_deserialize_pandas_categorical)
ctx.register_type(
pd.CategoricalDtype,
'pandas.CategoricalDtype',
custom_serializer=_serialize_pandas_categorical_dtype,
custom_deserializer=_deserialize_pandas_categorical_dtype)
_apply_pyarrow_serialization_patch(ctx)
if vineyard is not None: # pragma: no cover
vineyard.register_vineyard_serialize_context(ctx)
_serialize_context = ctx
return _serialize_context
def fetchData(rconn):
context = pyarrow.default_serialization_context()
#
# Check date of main dataframe
#
expires = rconn.hget("county", "expires")
if expires and time.time() < float(expires):
return context.deserialize(rconn.hget("county", "dataframe"))
#
# Fetch new copy
#
dt = pd.read_csv(
"https://github.com/nytimes/covid-19-data/blob/master/us-counties.csv?raw=true"
)
dt['dt'] = pd.to_datetime(dt.date, format="%Y-%m-%d")
#
# Save
#
rconn.hset("county", "dataframe",
context.serialize(dt).to_buffer().to_pybytes())
rconn.hset("county", "expires", str(time.time() + 600.0))
return dt
def getOGCdataframe(cls, cache_key, csv_url, process):
serializer = pa.default_serialization_context()
data = cache.get(cache_key)
app = current_app._get_current_object()
#if empty dataset refresh data synchronously, otherwise refresh in the background and continue
if not data:
df = refreshOGCdata(app, cache_key, csv_url, process)
else:
thread = Thread(target=refreshOGCdata,
args=(
app,
cache_key,
csv_url,
process,
))
thread.daemon = True
thread.start()
#update data and return
data = cache.get(cache_key)
if data:
df = serializer.deserialize(data)
return df
def test_torch_serialization(large_buffer):
pytest.importorskip("torch")
serialization_context = pa.default_serialization_context()
pa.register_torch_serialization_handlers(serialization_context)
# Dense tensors:
# These are the only types that are supported for the
# PyTorch to NumPy conversion
for t in ["float32", "float64",
"uint8", "int16", "int32", "int64"]:
obj = torch.from_numpy(np.random.randn(1000).astype(t))
serialization_roundtrip(obj, large_buffer,
context=serialization_context)
tensor_requiring_grad = torch.randn(10, 10, requires_grad=True)
serialization_roundtrip(tensor_requiring_grad, large_buffer,
context=serialization_context)
# Sparse tensors:
# These are the only types that are supported for the
# PyTorch to NumPy conversion
for t in ["float32", "float64",
"uint8", "int16", "int32", "int64"]:
i = torch.LongTensor([[0, 2], [1, 0], [1, 2]])
v = torch.from_numpy(np.array([3, 4, 5]).astype(t))
obj = torch.sparse_coo_tensor(i.t(), v, torch.Size([2, 3]))
serialization_roundtrip(obj, large_buffer,
context=serialization_context)
def connect(self):
logger.info("Connecting to redis cache")
import redis
import pyarrow as pa
self.redis_client = redis.Redis(**self.redis_args)
self.pyarrow_context = pa.default_serialization_context()
def update_histogram(trigger_idx, left_hide_trigger, histogram_sw, x_histogram,
y_histogram, keys_dict, num_keys, cat_keys,
categorical_key_values, numerical_key_values):
x_key = keys_dict[x_histogram]['key']
x_label = keys_dict[x_histogram]['description']
y_key = y_histogram
if histogram_sw:
context = pa.default_serialization_context()
data = context.deserialize(redis_instance.get("DATASET"))
filtered_table = filter_all(data, num_keys, numerical_key_values,
cat_keys, categorical_key_values)
histogram_fig = get_histogram(filtered_table, x_key, x_label, y_key)
histogram_x_disabled = False
histogram_y_disabled = False
else:
histogram_fig = {
'data': [{
'type': 'histogram',
'x': []
}],
'layout': {}
}
histogram_x_disabled = True
histogram_y_disabled = True
return [
histogram_fig,
histogram_x_disabled,
histogram_y_disabled,
]
def left_hide_button(
btn,
selectedData,
trigger_idx,
):
if btn > 0 and selectedData is not None:
context = pa.default_serialization_context()
data = context.deserialize(redis_instance.get("DATASET"))
s_data = pd.DataFrame(selectedData['points'])
idx = s_data['id']
idx.index = idx
vis_idx = idx[data['Visibility'][idx] == 'visible']
hid_idx = idx[data['Visibility'][idx] == 'hidden']
data.loc[vis_idx, 'Visibility'] = 'hidden'
data.loc[hid_idx, 'Visibility'] = 'visible'
redis_instance.set(REDIS_KEYS["DATASET"],
context.serialize(data).to_buffer().to_pybytes())
return trigger_idx + 1
else:
raise PreventUpdate
def __init__(self, redis_instance, key=None, hash_keys=False):
# Checks that a redis object has been passed
# https://stackoverflow.com/questions/57949871/how-to-set-get-pandas-dataframes-into-redis-using-pyarrow/57986261#57986261
if isinstance(redis_instance, redis.client.Redis) != True:
raise AttributeError(
"Did not recieve an Redis Object, instead recieved {}".format(
type(redis_instance)))
# Sets the redis object as an attribute of this class
self.cache_container = redis_instance
# pyarrow serializer, uses the default serialization method
self.context = pa.default_serialization_context()
# leading for reference in db, can be used to identify the caching object in redis
self.leading_key = 'RandasCache'
# Key to identify object/state of object,
# if None, key will try to be generated from inputs of function
self.key = key
assert isinstance(hash_keys,
bool), "[ERROR]: hash_keys should be a bool"
self.hash_keys = hash_keys
# storing of keys in the object so as to know how to retrieve the value
self.keys = {}
def test_sparse_csf_tensor_serialization(index_type, tensor_type):
tensor_dtype = np.dtype(tensor_type)
index_dtype = np.dtype(index_type)
data = np.array([[1, 2, 3, 4, 5, 6, 7, 8]]).T.astype(tensor_dtype)
indptr = [
np.array([0, 2, 3]),
np.array([0, 1, 3, 4]),
np.array([0, 2, 4, 5, 8]),
]
indices = [
np.array([0, 1]),
np.array([0, 1, 1]),
np.array([0, 0, 1, 1]),
np.array([1, 2, 0, 2, 0, 0, 1, 2]),
]
indptr = [x.astype(index_dtype) for x in indptr]
indices = [x.astype(index_dtype) for x in indices]
shape = (2, 3, 4, 5)
axis_order = (0, 1, 2, 3)
dim_names = ("a", "b", "c", "d")
for ndim in [2, 3, 4]:
sparse_tensor = pa.SparseCSFTensor.from_numpy(data, indptr[:ndim - 1],
indices[:ndim],
shape[:ndim],
axis_order[:ndim],
dim_names[:ndim])
context = pa.default_serialization_context()
serialized = pa.serialize(sparse_tensor, context=context).to_buffer()
result = pa.deserialize(serialized)
assert_equal(result, sparse_tensor)
assert isinstance(result, pa.SparseCSFTensor)
def save_data_frame(self, key: str, df: pd.DataFrame):
"""
Save a Pandas dataframe to Redis store
"""
context = pa.default_serialization_context()
self.redis_client.setex(key, EXPIRATION_SECONDS,
context.serialize(df).to_buffer().to_pybytes())
def test_numpy_subclass_serialization():
# Check that we can properly serialize subclasses of np.ndarray.
class CustomNDArray(np.ndarray):
def __new__(cls, input_array):
array = np.asarray(input_array).view(cls)
return array
def serializer(obj):
return {'numpy': obj.view(np.ndarray)}
def deserializer(data):
array = data['numpy'].view(CustomNDArray)
return array
context = pa.default_serialization_context()
context.register_type(CustomNDArray,
'CustomNDArray',
custom_serializer=serializer,
custom_deserializer=deserializer)
x = CustomNDArray(np.zeros(3))
serialized = pa.serialize(x, context=context).to_buffer()
new_x = pa.deserialize(serialized, context=context)
assert type(new_x) == CustomNDArray
assert np.alltrue(new_x.view(np.ndarray) == np.zeros(3))
def _serialize_and_expand_data(
cdf: SupersetDataFrame,
db_engine_spec: BaseEngineSpec,
use_msgpack: Optional[bool] = False,
expand_data: bool = False,
) -> Tuple[Union[bytes, str], list, list, list]:
selected_columns: list = cdf.columns or []
expanded_columns: list
if use_msgpack:
with stats_timing(
"sqllab.query.results_backend_pa_serialization", stats_logger
):
data = (
pa.default_serialization_context()
.serialize(cdf.raw_df)
.to_buffer()
.to_pybytes()
)
# expand when loading data from results backend
all_columns, expanded_columns = (selected_columns, [])
else:
data = cdf.data or []
if expand_data:
all_columns, data, expanded_columns = db_engine_spec.expand_data(
selected_columns, data
)
else:
all_columns = selected_columns
expanded_columns = []
return (data, selected_columns, all_columns, expanded_columns)
def test_numpy_subclass_serialization():
# Check that we can properly serialize subclasses of np.ndarray.
class CustomNDArray(np.ndarray):
def __new__(cls, input_array):
array = np.asarray(input_array).view(cls)
return array
def serializer(obj):
return {'numpy': obj.view(np.ndarray)}
def deserializer(data):
array = data['numpy'].view(CustomNDArray)
return array
context = pa.default_serialization_context()
context.register_type(CustomNDArray, 'CustomNDArray',
custom_serializer=serializer,
custom_deserializer=deserializer)
x = CustomNDArray(np.zeros(3))
serialized = pa.serialize(x, context=context).to_buffer()
new_x = pa.deserialize(serialized, context=context)
assert type(new_x) == CustomNDArray
assert np.alltrue(new_x.view(np.ndarray) == np.zeros(3))
def save_signal_database():
logger.debug("Saving signal database to redis")
r = redis_handle()
alerts = Alerts()
context = pa.default_serialization_context()
for signal, df in alerts.data.items():
r.sadd(signal, context.serialize(df).to_buffer().to_pybytes())
def cache_df(self, alias, df):
cur = redis.Redis(connection_pool=self.redis_pool)
context = pa.default_serialization_context()
df_compressed = context.serialize(df).to_buffer().to_pybytes()
res = cur.set(alias, df_compressed)
if res == True:
print('df cached')
def _df_from_redis(self, key):
"""Loads a pd.DataFrame from redis. """
buffer = self._r.get(key)
if buffer is not None:
context = pa.default_serialization_context()
return context.deserialize(buffer)
else:
return None
def get_api_dataframe(level, month):
""" Gets API data for a given area hierachy level and month (yyyy-mm) and saves it as a dataframe to Redis """
query_filters = [
"areaType="+level,
"date>="+month+"-01",
"date<="+month+"-31"
]
# Query API data for this hierachy level (API can be flaky so try up to 3 times)
attempts = 1
json_data = list()
while attempts < 4 and len(json_data) == 0:
print(f"Querying API..... Attempt {attempts} - Level {level} - Month {month}")
json_data = get_api_paginated_dataset(query_filters, get_structure(level))
attempts += 1
if len(json_data) == 0:
# Wait 30 seconds before trying again
time.sleep(30)
checktotal = None
if len(json_data) > 0:
# Convert json data to dataframe
df = pd.DataFrame.from_dict(json_data, orient='columns')
# Rename api level with our application level text (e.g. utla to Upper tier local authority)
df['type'] = df['type'].replace(level,LEVELS_DICT[level])
# Tidy up dataframe, rename columns, replace some data, fill nas, sort, convert types etc
df.rename(columns=COLUMN_RENAMES,inplace=True)
df['Date'] = pd.to_datetime(df['Date'],format="%Y-%m-%d")
df.sort_values(by=['Date'], inplace=True)
df.set_index('Date',inplace=True)
df.fillna(0,inplace=True)
df = df.astype({'Cases': int, 'Tests': int, 'Hospital Cases': int, 'Deaths within 28 Days of Positive Test': int})
# Save dataframe to redis - note we create a new connection here so it can be serialised by Spark
r = redis.Redis(host="localhost", port=6379, db=0)
ac = pa.default_serialization_context()
# Save dataframe to redis - first backup previous data to "Old.xxx" key
oldkey = "Old.Cases."+level+"."+month
currentkey = "Cases."+level+"."+month
if r.exists(oldkey):
r.delete(oldkey)
if r.exists(currentkey):
r.rename(currentkey,oldkey)
# Save new data
r.set(currentkey, ac.serialize(df).to_buffer().to_pybytes())
checktotal = df['Cases'].sum()
print(f"Total Cases : {checktotal}")
return checktotal
def mars_serialize_context():
global _serialize_context
if _serialize_context is None:
ctx = pyarrow.default_serialization_context()
ctx.register_type(SparseNDArray, 'mars.SparseNDArray',
custom_serializer=_serialize_sparse_csr_list,
custom_deserializer=_deserialize_sparse_csr_list)
_serialize_context = ctx
return _serialize_context
def load_signal_database():
logger.debug("Loading signal database")
alerts = Alerts()
r = redis_handle()
context = pa.default_serialization_context()
signals = get_signals()
for signal in signals:
alerts.data[signal] = context.deserialize(r.get(signal))
def __init__(self, raylet_socket_name, object_store_socket_name,
is_worker):
# Connect to the Raylet and object store.
self.node_manager_client = ray.local_scheduler.LocalSchedulerClient(
raylet_socket_name, random_string(), is_worker)
self.plasma_client = plasma.connect(object_store_socket_name, "", 0)
self.serialization_context = pyarrow.default_serialization_context()
self.raylet_socket_name = raylet_socket_name
self.object_store_socket_name = object_store_socket_name
def get_df_cache(self,ns='twitter_cache:df:',key=''):
context = pa.default_serialization_context()
if type(key) is bytes:
get_key=key
else:
get_key=ns+key
if self.r.get(get_key):
return context.deserialize(self.r.get(get_key))
else:
return pd.DataFrame()
def setup(self):
# Transpose to make column-major
values = np.random.randn(10, 100000)
df = pd.DataFrame(values.T)
ctx = pa.default_serialization_context()
self.serialized = ctx.serialize(df)
self.as_buffer = self.serialized.to_buffer()
self.as_components = self.serialized.to_components()
def get_data_frame(self, key: str) -> Optional:
"""
Retrieve a Pandas dataframe from Redis store
"""
value = self.redis_client.get(key)
if value is None:
return
context = pa.default_serialization_context()
return context.deserialize(value)
def mars_serialize_context():
global _serialize_context
if _serialize_context is None:
from ..compat import apply_pyarrow_serialization_patch
ctx = pyarrow.default_serialization_context()
ctx.register_type(SparseNDArray, 'mars.SparseNDArray',
custom_serializer=_serialize_sparse_csr_list,
custom_deserializer=_deserialize_sparse_csr_list)
apply_pyarrow_serialization_patch(ctx)
_serialize_context = ctx
return _serialize_context
def mars_serialize_context():
from ..dataframe.arrays import ArrowArray, ArrowDtype
global _serialize_context
if _serialize_context is None:
ctx = pyarrow.default_serialization_context()
ctx.register_type(_PickleWrapper,
'mars.PickleWrapper',
custom_serializer=_PickleWrapper.serialize,
custom_deserializer=_PickleWrapper.deserialize)
ctx.register_type(_ComplexWrapper,
'mars.ComplexWrapper',
custom_serializer=_ComplexWrapper.serialize,
custom_deserializer=_ComplexWrapper.deserialize)
ctx.register_type(SparseNDArray,
'mars.SparseNDArray',
custom_serializer=_serialize_sparse_nd_array,
custom_deserializer=_deserialize_sparse_nd_array)
ctx.register_type(GroupByWrapper,
'pandas.GroupByWrapper',
custom_serializer=_serialize_groupby_wrapper,
custom_deserializer=_deserialize_groupby_wrapper)
ctx.register_type(pd.Interval,
'pandas.Interval',
custom_serializer=_serialize_pandas_interval,
custom_deserializer=_deserialize_pandas_interval)
ctx.register_type(pd.Categorical,
'pandas.Categorical',
custom_serializer=_serialze_pandas_categorical,
custom_deserializer=_deserialize_pandas_categorical)
ctx.register_type(
pd.CategoricalDtype,
'pandas.CategoricalDtype',
custom_serializer=_serialize_pandas_categorical_dtype,
custom_deserializer=_deserialize_pandas_categorical_dtype)
ctx.register_type(ArrowDtype,
'mars.dataframe.ArrowDtype',
custom_serializer=_serialize_arrow_dtype,
custom_deserializer=_deserialize_arrow_dtype)
ctx.register_type(ArrowArray,
'mars.dataframe.ArrowArray',
custom_serializer=_serialize_arrow_array,
custom_deserializer=_deserialize_arrow_array)
ctx.register_type(pd.arrays.SparseArray,
'pandas.arrays.SparseArray',
custom_serializer=_serialize_sparse_array,
custom_deserializer=_deserialzie_sparse_array)
ctx.register_type(pd.SparseDtype,
'pandas.SparseDtype',
custom_serializer=_serialize_sparse_dtype,
custom_deserializer=_deserialize_sparse_dtype)
_apply_pyarrow_serialization_patch(ctx)
_serialize_context = ctx
return _serialize_context
def test_torch_serialization(large_buffer):
pytest.importorskip("torch")
serialization_context = pa.default_serialization_context()
pa.register_torch_serialization_handlers(serialization_context)
# These are the only types that are supported for the
# PyTorch to NumPy conversion
for t in ["float32", "float64", "uint8", "int16", "int32", "int64"]:
obj = torch.from_numpy(np.random.randn(1000).astype(t))
serialization_roundtrip(obj,
large_buffer,
context=serialization_context)
def test_torch_serialization(large_buffer):
pytest.importorskip("torch")
serialization_context = pa.default_serialization_context()
pa.register_torch_serialization_handlers(serialization_context)
# These are the only types that are supported for the
# PyTorch to NumPy conversion
for t in ["float32", "float64",
"uint8", "int16", "int32", "int64"]:
obj = torch.from_numpy(np.random.randn(1000).astype(t))
serialization_roundtrip(obj, large_buffer,
context=serialization_context)
def make_serialization_context():
context = pa.default_serialization_context()
context.register_type(Foo, "Foo")
context.register_type(Bar, "Bar")
context.register_type(Baz, "Baz")
context.register_type(Qux, "Quz")
context.register_type(SubQux, "SubQux")
context.register_type(SubQuxPickle, "SubQuxPickle", pickle=True)
context.register_type(Exception, "Exception")
context.register_type(CustomError, "CustomError")
context.register_type(Point, "Point")
context.register_type(NamedTupleExample, "NamedTupleExample")
return context
def test_serialization_callback_numpy():
class DummyClass(object):
pass
def serialize_dummy_class(obj):
x = np.zeros(4)
return x
def deserialize_dummy_class(serialized_obj):
return serialized_obj
context = pa.default_serialization_context()
context.register_type(DummyClass, "DummyClass",
custom_serializer=serialize_dummy_class,
custom_deserializer=deserialize_dummy_class)
pa.serialize(DummyClass(), context=context)
def test_buffer_serialization():
class BufferClass(object):
pass
def serialize_buffer_class(obj):
return pa.py_buffer(b"hello")
def deserialize_buffer_class(serialized_obj):
return serialized_obj
context = pa.default_serialization_context()
context.register_type(
BufferClass, "BufferClass",
custom_serializer=serialize_buffer_class,
custom_deserializer=deserialize_buffer_class)
b = pa.serialize(BufferClass(), context=context).to_buffer()
assert pa.deserialize(b, context=context).to_pybytes() == b"hello"