50b55cee42
- Create tables on application startup via lifespan event - Flush project before creating elements (generate project_id) - Flush each element before creating properties (generate element_id) - Add IfcWallStandardCase to parsed element types - Include FZK-Haus sample IFC file for testing - Tested: 58 elements, 3601 properties parsed successfully
128 lines
4 KiB
Python
128 lines
4 KiB
Python
"""Service for parsing IFC files and storing elements in the database."""
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import tempfile
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from pathlib import Path
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import ifcopenshell
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.models.element import Element, Project, Property
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async def parse_ifc_file(
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filename: str,
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content: bytes,
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db: AsyncSession,
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) -> Project:
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"""
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Parse an IFC file and persist its structure to the database.
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Extracts building elements (walls, doors, slabs, windows, etc.)
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along with their property sets into the relational model.
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"""
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# Write to temp file (ifcopenshell needs a file path)
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with tempfile.NamedTemporaryFile(suffix=".ifc", delete=False) as tmp:
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tmp.write(content)
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tmp_path = Path(tmp.name)
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try:
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ifc = ifcopenshell.open(str(tmp_path))
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finally:
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tmp_path.unlink()
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# Create project record
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project = Project(
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name=_extract_project_name(ifc, filename),
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filename=filename,
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description=_extract_project_description(ifc),
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ifc_schema=ifc.schema,
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)
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db.add(project)
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await db.flush()
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# Extract elements
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element_types = [
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"IfcWall", "IfcWallStandardCase", "IfcDoor", "IfcWindow", "IfcSlab",
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"IfcColumn", "IfcBeam", "IfcStair", "IfcRoof",
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"IfcSpace", "IfcFurnishingElement", "IfcBuildingElementProxy",
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]
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for ifc_type in element_types:
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for ifc_element in ifc.by_type(ifc_type):
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storey = _get_storey(ifc_element)
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element = Element(
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project_id=project.id,
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global_id=ifc_element.GlobalId,
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ifc_type=ifc_element.is_a(),
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name=ifc_element.Name or "",
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description=ifc_element.Description or "",
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storey=storey,
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)
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db.add(element)
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await db.flush()
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# Extract property sets
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for pset_name, props in _get_properties(ifc_element).items():
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for prop_name, prop_value in props.items():
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prop = Property(
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element_id=element.id,
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pset_name=pset_name,
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name=prop_name,
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value=str(prop_value) if prop_value is not None else "",
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)
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db.add(prop)
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await db.commit()
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await db.refresh(project)
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return project
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def _extract_project_name(ifc, fallback_filename: str) -> str:
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"""Try to get the project name from the IFC file."""
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try:
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ifc_project = ifc.by_type("IfcProject")[0]
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if ifc_project.Name:
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return ifc_project.Name
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except (IndexError, AttributeError):
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pass
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return Path(fallback_filename).stem
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def _extract_project_description(ifc) -> str:
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"""Try to get the project description from the IFC file."""
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try:
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ifc_project = ifc.by_type("IfcProject")[0]
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return ifc_project.Description or ""
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except (IndexError, AttributeError):
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return ""
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def _get_storey(element) -> str:
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"""Determine which building storey an element belongs to."""
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try:
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for rel in element.ContainedInStructure:
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if rel.RelatingStructure.is_a("IfcBuildingStorey"):
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return rel.RelatingStructure.Name or ""
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except AttributeError:
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pass
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return ""
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def _get_properties(element) -> dict[str, dict[str, any]]:
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"""Extract all property sets from an IFC element."""
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result = {}
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try:
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for definition in element.IsDefinedBy:
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if definition.is_a("IfcRelDefinesByProperties"):
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pset = definition.RelatingPropertyDefinition
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if pset.is_a("IfcPropertySet"):
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props = {}
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for prop in pset.HasProperties:
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if prop.is_a("IfcPropertySingleValue"):
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value = prop.NominalValue.wrappedValue if prop.NominalValue else None
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props[prop.Name] = value
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result[pset.Name] = props
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except AttributeError:
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pass
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return result
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