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factory.py
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factory.py
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"""Module contains factory method for building class:`Engine` objects."""
import contextlib
from .galaxy import GalaxyEngine
from .galaxy import DockerizedGalaxyEngine
from .cwltool import CwlToolEngine
UNKNOWN_ENGINE_TYPE_MESSAGE = "Unknown engine type specified [%s]."
def is_galaxy_engine(**kwds):
"""Return True iff the engine configured is :class:`GalaxyEngine`."""
engine_type_str = kwds.get("engine", "galaxy")
return engine_type_str == "galaxy"
def build_engine(ctx, **kwds):
"""Build an engine from the supplied planemo configuration."""
engine_type_str = kwds.get("engine", "galaxy")
if engine_type_str == "galaxy":
engine_type = GalaxyEngine
elif engine_type == "dockerize_galaxy":
engine_type = DockerizedGalaxyEngine
elif engine_type_str == "cwltool":
engine_type = CwlToolEngine
else:
raise Exception(UNKNOWN_ENGINE_TYPE_MESSAGE % engine_type_str)
return engine_type(ctx, **kwds)
@contextlib.contextmanager
def engine_context(ctx, **kwds):
"""A :func:`contextlib.contextmanager` engine builder for use with ``with`` statements.
https://docs.python.org/2/library/contextlib.html
"""
engine = None
try:
engine = build_engine(ctx, **kwds)
yield engine
finally:
if engine is not None:
engine.cleanup()
__all__ = [
"is_galaxy_engine",
"build_engine",
"engine_context",
]