Source code for dtale.cli.loaders.arctic_loader
from arctic import Arctic # isort:skip
from builtins import map
import pandas as pd
from arctic.store.versioned_item import VersionedItem
from dtale.cli.clickutils import get_loader_options
'''
IMPORTANT!!! This global variable is required for building any customized CLI loader.
When find loaders on startup it will search for any modules containing the global variable LOADER_KEY.
'''
LOADER_KEY = 'arctic'
LOADER_PROPS = ['host', 'library', 'node', 'start', 'end']
# IMPORTANT!!! This function is required for building any customized CLI loader.
[docs]def find_loader(kwargs):
"""
Arctic implementation of data loader which will return a function if any of the
`click` options based on LOADER_KEY & LOADER_PROPS have been used, otherwise return None
:param kwargs: Optional keyword arguments to be passed from `click`
:return: data loader function for arctic implementation
"""
arctic_opts = get_loader_options(LOADER_KEY, kwargs)
if len([f for f in arctic_opts.values() if f]):
def _arctic_loader():
host = Arctic(arctic_opts['host'])
lib = host.get_library(arctic_opts['library'])
read_kwargs = {}
start, end = map(arctic_opts.get, ['start', 'end'])
if start and end:
read_kwargs['chunk_range'] = pd.date_range(start, end)
data = lib.read(arctic_opts['node'], **read_kwargs)
if isinstance(data, VersionedItem):
data = data.data
return data
return _arctic_loader
return None