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Backend fastpath #10937

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Backend fastpath #10937

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4b6b472
fastpath for built-ins
slevang Nov 20, 2025
9c20610
set missing params
slevang Nov 21, 2025
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24 changes: 15 additions & 9 deletions xarray/backends/plugins.py
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Original file line number Diff line number Diff line change
Expand Up @@ -215,15 +215,21 @@ def guess_engine(
def get_backend(engine: str | type[BackendEntrypoint]) -> BackendEntrypoint:
"""Select open_dataset method based on current engine."""
if isinstance(engine, str):
engines = list_engines()
if engine not in engines:
raise ValueError(
f"unrecognized engine '{engine}' must be one of your download engines: {list(engines)}. "
"To install additional dependencies, see:\n"
"https://docs.xarray.dev/en/stable/user-guide/io.html \n"
"https://docs.xarray.dev/en/stable/getting-started-guide/installing.html"
)
backend = engines[engine]
if engine in BACKEND_ENTRYPOINTS:
# fast path for built-in engines
backend_cls = BACKEND_ENTRYPOINTS[engine][1]
set_missing_parameters({engine: backend_cls})
backend = backend_cls()
else:
engines = list_engines()
if engine not in engines:
raise ValueError(
f"unrecognized engine '{engine}' must be one of your download engines: {list(engines)}. "
"To install additional dependencies, see:\n"
"https://docs.xarray.dev/en/stable/user-guide/io.html \n"
"https://docs.xarray.dev/en/stable/getting-started-guide/installing.html"
)
backend = engines[engine]
elif issubclass(engine, BackendEntrypoint):
backend = engine()
else:
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