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Use datapath with UDA when fetching IDS properties #39

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Merged
olivhoenen merged 1 commit into from
Apr 25, 2025
Merged

Use datapath with UDA when fetching IDS properties #39

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11 changes: 7 additions & 4 deletions imas/backends/imas_core/al_context.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
# This file is part of IMAS-Python.
# You should have received the IMAS-Python LICENSE file with this project.
"""Object-oriented interface to the IMAS lowlevel.
"""
"""Object-oriented interface to the IMAS lowlevel."""

import logging
import weakref
Expand Down Expand Up @@ -61,17 +60,21 @@ def __enter__(self) -> "ALContext":
def __exit__(self, exc_type, exc_value, traceback) -> None:
ll_interface.end_action(self.ctx)

def global_action(self, path: str, rwmode: int) -> "ALContext":
def global_action(self, path: str, rwmode: int, datapath: str = "") -> "ALContext":
"""Begin a new global action for use in a ``with`` context.

Args:
path: access layer path for this global action: ``<idsname>[/<occurrence>]``
rwmode: read-only or read-write operation mode: ``READ_OP``/``WRITE_OP``
datapath: used by UDA backend to fetch only part of the data.

Returns:
The created context.
"""
status, ctx = ll_interface.begin_global_action(self.ctx, path, rwmode)
args = [self.ctx, path, rwmode]
if datapath: # AL4 compatibility: datapath arg was added in AL5
args.append(datapath)
status, ctx = ll_interface.begin_global_action(*args)
if status != 0:
raise LowlevelError("global_action", status)
return ALContext(ctx)
Expand Down
6 changes: 4 additions & 2 deletions imas/backends/imas_core/db_entry_al.py
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Original file line number Diff line number Diff line change
Expand Up @@ -257,7 +257,8 @@ def get(
if occurrence != 0:
ll_path += f"/{occurrence}"

with self._db_ctx.global_action(ll_path, READ_OP) as read_ctx:
datapath = "ids_properties" if self.backend == "uda" else ""
with self._db_ctx.global_action(ll_path, READ_OP, datapath) as read_ctx:
time_mode_path = "ids_properties/homogeneous_time"
time_mode = read_ctx.read_data(time_mode_path, "", INTEGER_DATA, 0)
# This is already checked by read_dd_version, but ensure:
Expand Down Expand Up @@ -314,7 +315,8 @@ def read_dd_version(self, ids_name: str, occurrence: int) -> str:
if occurrence != 0:
ll_path += f"/{occurrence}"

with self._db_ctx.global_action(ll_path, READ_OP) as read_ctx:
datapath = "ids_properties" if self.backend == "uda" else ""
with self._db_ctx.global_action(ll_path, READ_OP, datapath) as read_ctx:
time_mode_path = "ids_properties/homogeneous_time"
time_mode = read_ctx.read_data(time_mode_path, "", INTEGER_DATA, 0)
dd_version_path = "ids_properties/version_put/data_dictionary"
Expand Down
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