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2ab6a411f4
* Druid dashboard import * Fix tests. * Parse params with trailing commas * Resolved issue with datasource is not in DB yet when slice perms are set * Finish rebase * Fix heads alembic problem.
80 lines
2.8 KiB
Python
80 lines
2.8 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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class_names = [str(s) for s in class_names]
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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_all_datasources(cls, session):
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datasources = []
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for source_type in SourceRegistry.sources:
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datasources.extend(
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session.query(SourceRegistry.sources[source_type]).all())
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return datasources
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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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# Filter datasoures that don't have database.
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db_ds = [d for d in datasources if d.database and
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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 query_datasources_by_name(
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cls, session, database, datasource_name, schema=None):
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datasource_class = SourceRegistry.sources[database.type]
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if database.type == 'table':
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query = (
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session.query(datasource_class)
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.filter_by(database_id=database.id)
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.filter_by(table_name=datasource_name))
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if schema:
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query = query.filter_by(schema=schema)
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return query.all()
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if database.type == 'druid':
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return (
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session.query(datasource_class)
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.filter_by(cluster_name=database.id)
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.filter_by(datasource_name=datasource_name)
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.all()
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)
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return None
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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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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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