# Copyright (c) 2019, MD2K Center of Excellence
# - Nasir Ali <nasir.ali08@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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import os
import pyarrow as pa
from cerebralcortex.core.data_manager.raw.filebased_storage import FileBasedStorage
from cerebralcortex.core.data_manager.raw.stream_handler import StreamHandler
from cerebralcortex.core.log_manager.log_handler import LogTypes
from cerebralcortex.core.metadata_manager.stream.metadata import Metadata
[docs]class RawData(StreamHandler, FileBasedStorage):
def __init__(self, CC):
"""
Constructor
Args:
CC (CerebralCortex): CerebralCortex object reference
Raises:
ValueError: if correct storage engine is not selected
"""
self.config = CC.config
self.sql_data = CC.SqlData
self.study_name = CC.study_name.lower()
self.new_study = CC.new_study
self.logging = CC.logging
self.nosql_store = self.config['nosql_storage']
self.sparkSession = CC.sparkSession
self.metadata = Metadata()
# pseudo factory pattern
if self.nosql_store == "hdfs":
self.hdfs_ip = self.config['hdfs']['host']
self.hdfs_port = self.config['hdfs']['port']
self.hdfs_spark_url = "hdfs://"+str(self.hdfs_ip)+":"+str(self.hdfs_port)+"/"
self.data_path = self.config['hdfs']['raw_files_dir']
if self.data_path[-1]!= "/":
self.data_path+= "/"
self.fs = pa.hdfs.connect(self.hdfs_ip, self.hdfs_port)
elif self.nosql_store=="filesystem":
self.data_path = self.config["filesystem"]["filesystem_path"]
if self.data_path[-1]!= "/":
self.data_path+= "/"
if not os.access(self.data_path, os.W_OK):
raise Exception(self.data_path + " path is not writable. Please check your cerebralcortex.yml configurations.")
self.fs = os
else:
raise ValueError(self.nosql_store + " is not supported.")
# if self.config["visualization_storage"]!="none":
# self.timeSeriesData = TimeSeriesData(CC)
self.logtypes = LogTypes()