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73cd2ea3b1
* Implement import / export dashboard functionality. * Address comments from discussion. * Add function descriptions. * Minor fixes * Fix tests for python 3. * Export datasources. * Implement tables import. * Json.loads does not support trailing commas. * Improve alter_dict func * Resolve comments. * Refactor tests * Move params_dict and alter_params to the ImportMixin * Fix flask menues.
51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
from sqlalchemy.orm import subqueryload
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class SourceRegistry(object):
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""" Central Registry for all available datasource engines"""
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sources = {}
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@classmethod
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def register_sources(cls, datasource_config):
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for module_name, class_names in datasource_config.items():
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module_obj = __import__(module_name, fromlist=class_names)
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for class_name in class_names:
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source_class = getattr(module_obj, class_name)
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cls.sources[source_class.type] = source_class
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@classmethod
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def get_datasource(cls, datasource_type, datasource_id, session):
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return (
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session.query(cls.sources[datasource_type])
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.filter_by(id=datasource_id)
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.one()
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)
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@classmethod
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def get_datasource_by_name(cls, session, datasource_type, datasource_name,
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schema, database_name):
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datasource_class = SourceRegistry.sources[datasource_type]
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datasources = session.query(datasource_class).all()
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db_ds = [d for d in datasources if d.database.name == database_name and
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d.name == datasource_name and schema == schema]
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return db_ds[0]
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@classmethod
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def get_eager_datasource(cls, session, datasource_type, datasource_id):
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"""Returns datasource with columns and metrics."""
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datasource_class = SourceRegistry.sources[datasource_type]
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if datasource_type == 'table':
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return (
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session.query(datasource_class)
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.options(
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subqueryload(datasource_class.columns),
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subqueryload(datasource_class.metrics)
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)
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.filter_by(id=datasource_id)
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.one()
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)
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# TODO: support druid datasources.
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return session.query(datasource_class).filter_by(
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id=datasource_id).first()
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