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219 lines
10 KiB
Markdown
219 lines
10 KiB
Markdown
# GDS and SVG Generation Logic Path
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This document traces the current code path for generating saved layout YAML,
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layout preview SVG, and downloadable project GDS when the user clicks
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`Build Layout` or `Build GDS`.
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Line numbers refer to the files as currently checked in.
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## Build-Time Router Gate
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`python backend/server.py` -> `app.run` starts without importing
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`mxpic_router`, `mxpic_forge`, Nazca, or gdstk. Login, dashboard, canvas
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editing, YAML generation, PDK browsing, and project save without preview do not
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require the external build stack.
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Build actions validate the external stack on demand:
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- `Build GDS` -> `backend/gds_builder.py` -> `require_router_stack()`.
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- `Build Layout` SVG preview -> `backend/routed_layout_preview.py` ->
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`require_router_stack(require_gdstk=True)`.
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Important functions:
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- `ensure_router_path` (`backend/router_dependency.py` line 23) adds the sibling
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`../mxpic_router` checkout to `sys.path` when present.
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- `require_router_stack` (`backend/router_dependency.py` line 31) imports
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`mxpic_router`, `nazca`, and the route backend used by `mxpic_router`.
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The preferred route backend is `mxpic_forge.Route`; if it is absent,
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`mxpic_router` falls back to Nazca `interconnects.Interconnect`.
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`gdstk` is checked only when SVG preview generation requests it.
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## Generated Files
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- Saved cell YAML: `database/<username>/layout/<project>/<cell>.yml`
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- Path helpers: `user_layout_root`, `project_root`, `cell_file_path`
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(`backend/server.py` lines 124-137).
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- Saved layout preview SVG: `database/<username>/layout/<project>/<cell>.svg`
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- Path helper: `cell_svg_path` (`backend/server.py` lines 140-142).
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- Optional route sidecar: `database/<username>/layout/<project>/<cell>.routes.yml`
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- Path helper and writer: `cell_routes_path`, `write_route_points_sidecar`
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(`backend/server.py` lines 145-175).
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- Downloadable GDS export: `database/_exports/<uuid>/<project>.gds`
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- Created by `create_export_path` (`backend/pdk_access.py` lines 53-59).
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## Build Layout: Click Button -> YAML -> Router GDS -> SVG
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Compact path:
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`Click Build Layout` -> `handleBuildLayout` (`frontend/canvas.html` line 6209) :
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`buildYamlForPage` (`frontend/canvas.html` line 6141) generates layout YAML ->
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POST `/api/save-layout` (`frontend/canvas.html` line 6219) -> `save_layout`
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(`backend/server.py` line 715) writes `<cell>.yml` -> `create_routed_layout_svg`
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(`backend/server.py` line 734) -> `mxpic_router.build_project_gds` generates
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temporary Nazca GDS -> `gdstk.read_gds` + `write_svg` writes `<cell>.svg` ->
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backend returns `svg_url` -> `openLayoutPreview` (`frontend/canvas.html` line
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6183) opens the SVG preview tab.
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Detailed path:
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1. The button is rendered only for non-preview pages:
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- `<button onClick={handleBuildLayout}>` (`frontend/canvas.html` lines
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6491-6498).
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2. `handleBuildLayout` creates YAML for the active page:
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- `handleBuildLayout` starts at `frontend/canvas.html` line 6209.
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- It validates route crossings and calls `buildYamlForPage(activePage)` at
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line 6215.
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- `buildYamlForPage` starts at line 6141 and writes:
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- `schema_version`, `kind`, `coordinate_system: gds_y_up`,
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`canvas_size`, `project`, `name`, `type`, `version`.
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- `pins` via `buildCanvasPinsYaml`.
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- `instances` via `buildInstancesYaml`.
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- `elements` via `buildElementsYaml`.
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- `bundles` via `buildBundlesYaml`.
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3. Frontend sends the YAML to Flask:
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- `fetch('/api/save-layout', ...)` at `frontend/canvas.html` line 6219.
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- Body includes `project`, `cell`, and `content` at lines 6222-6226.
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4. Flask saves YAML and route sidecar:
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- Route: `/api/save-layout` (`backend/server.py` line 713).
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- Function: `save_layout` (`backend/server.py` line 715).
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- `save_path = cell_file_path(project, cell)` (`backend/server.py` line 724).
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- Writes the YAML content to disk (`backend/server.py` lines 727-728).
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- Extracts route points into `<cell>.routes.yml` through
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`write_route_points_sidecar` (`backend/server.py` line 729).
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5. Flask always uses the router-backed SVG preview:
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- Preview output path is computed with `cell_svg_path`
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(`backend/server.py` line 733).
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- `create_routed_layout_svg(...)` is called unconditionally for preview
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generation (`backend/server.py` lines 734-742).
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- There is no production branch based on `bundles.*.links`; no-link and
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linked layouts both use the same router path.
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6. Routed preview helper converts router GDS into SVG:
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- `create_routed_layout_svg` starts at `backend/routed_layout_preview.py`
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line 14.
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- It loads the YAML string, gets the target cell name, and imports
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`mxpic_router.build_project_gds` (`backend/routed_layout_preview.py` lines
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25-32).
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- It builds a temporary GDS with `target_cell_name=cell_name`
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(`backend/routed_layout_preview.py` lines 37-46).
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- It reads that temporary GDS with `gdstk.read_gds`
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(`backend/routed_layout_preview.py` line 47).
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- It writes the saved preview SVG with `top_cells[0].write_svg(output_path)`
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(`backend/routed_layout_preview.py` line 51).
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Inside sibling router checkout:
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- `mxpic_router.build_project_gds` starts at
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`../mxpic_router/mxpic_router/builder.py` line 12.
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- `_load_project_specs` reads all saved `.yml` / `.yaml` files from the project
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directory (`../mxpic_router/mxpic_router/builder.py` line 46).
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- `load_cell_spec` reads YAML with `yaml.safe_load`
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(`../mxpic_router/mxpic_router/eda_loader.py` line 80).
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- `parse_cell_dict` converts YAML into `CellSpec`, including `pins`,
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`elements`, `instances`, and `bundles`
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(`../mxpic_router/mxpic_router/eda_loader.py` lines 85-157).
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- `_build_cell` creates `with nd.Cell(name=spec.name) as top`
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(`../mxpic_router/mxpic_router/builder.py` line 70).
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- `_build_cell` places basic, local, or PDK GDS instances and registers pins
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(`../mxpic_router/mxpic_router/builder.py` lines 73-108).
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- `_route_link` draws routed geometry for each bundle link when links exist
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(`../mxpic_router/mxpic_router/builder.py` line 269).
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- `nd.export_gds(topcells=[built_cells[top.name]], filename=output_path)`
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writes the temporary routed GDS (`../mxpic_router/mxpic_router/builder.py`
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line 37).
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## Build GDS: Click Button -> Saved YAML -> Router GDS
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Compact path:
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`Click Build GDS` -> Project Tree button calls `onBuildGds`
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(`frontend/canvas.html` line 2738) -> `handleBuildGds`
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(`frontend/canvas.html` line 6287) -> POST `/api/build-gds`
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(`frontend/canvas.html` line 6294) -> `build_gds`
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(`backend/server.py` line 775) -> `build_project_gds`
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(`backend/gds_builder.py` line 26) : read saved `.yml` files for project
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validation -> `_build_with_mxpic_router` (`backend/gds_builder.py` line 47) ->
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`mxpic_router` creates `nd.Cell` objects and exports `.gds` -> backend returns
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`download_url` -> frontend clicks a temporary download link.
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Detailed path:
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1. The `Build GDS` button is in the project tree header:
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- `<button className="build-gds-btn" onClick={onBuildGds}>`
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(`frontend/canvas.html` lines 2738-2739).
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- `onBuildGds={handleBuildGds}` is passed into `LeftPanel`
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(`frontend/canvas.html` line 6354).
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2. `handleBuildGds` calls the backend:
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- Function starts at `frontend/canvas.html` line 6287.
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- It validates route crossings for all non-preview pages
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(`frontend/canvas.html` lines 6289-6290).
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- It POSTs only `{ project: currentProjectName }` to `/api/build-gds`
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(`frontend/canvas.html` lines 6294-6298).
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Important behavior:
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- `Build GDS` does not serialize the current in-memory canvas first.
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- It reads YAML files that already exist on disk.
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- Those YAML files are produced by `Build Layout` or by the separate `Save`
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button, where `handleSaveProjectLayouts` saves every non-preview page with
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`preview: false` (`frontend/canvas.html` lines 6253-6284).
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3. Flask creates a temporary export path and calls the GDS builder:
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- Route: `/api/build-gds` (`backend/server.py` line 773).
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- Function: `build_gds` (`backend/server.py` line 775).
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- Old exports are cleaned (`backend/server.py` line 781).
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- The project directory is resolved and validated
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(`backend/server.py` lines 782-784).
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- `create_export_path` creates `database/_exports/<uuid>/<project>.gds`
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(`backend/server.py` line 785, `backend/pdk_access.py` lines 53-59).
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- `build_project_gds(...)` is called (`backend/server.py` lines 786-792).
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4. `backend/gds_builder.py` delegates to `mxpic_router`:
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- `build_project_gds` starts at `backend/gds_builder.py` line 26.
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- `_load_project_cells(project_dir)` reads every saved `.yml` / `.yaml`
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file for validation (`backend/gds_builder.py` line 73).
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- `_build_with_mxpic_router` starts at `backend/gds_builder.py` line 47.
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- `_build_with_mxpic_router` calls `ensure_router_path` and imports
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`mxpic_router.build_project_gds` (`backend/gds_builder.py` lines 54-55).
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- There is no production fallback to local gdstk or local Nazca builders.
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5. `mxpic_router` builds the final GDS:
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- `mxpic_router.build_project_gds` starts at
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`../mxpic_router/mxpic_router/builder.py` line 12.
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- `_build_cell` creates one `nd.Cell` per `CellSpec`
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(`../mxpic_router/mxpic_router/builder.py` line 70).
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- `_resolve_pdk_asset` finds component YAML/GDS in the active PDK root
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(`../mxpic_router/mxpic_router/builder.py` line 509).
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- `_route_link` draws routed geometry when saved bundle links exist
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(`../mxpic_router/mxpic_router/builder.py` line 269).
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- `nd.export_gds(...)` writes the output GDS
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(`../mxpic_router/mxpic_router/builder.py` line 37).
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## PDK Asset Resolution
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The active PDK root still comes from the EDA backend request/session state:
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- `current_pdk_root` uses `pdk_root_for_session`
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(`backend/server.py` lines 196-198).
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- `pdk_root_for_session` chooses the root based on the logged-in user group
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(`backend/pdk_access.py` lines 43-50).
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- Preview and GDS generation pass that PDK root into `mxpic_router`.
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- `mxpic_router._resolve_pdk_asset` resolves component YAML/GDS under that root
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(`../mxpic_router/mxpic_router/builder.py` line 509).
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## Download Completion
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After GDS build:
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`build_gds` returns `download_url` (`backend/server.py` line 803) ->
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`handleBuildGds` creates a temporary `<a>` and clicks it
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(`frontend/canvas.html` lines 6309-6316) -> `/api/exports/<export_id>/<filename>`
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serves the GDS (`backend/server.py` lines 812-829) -> the temporary export
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folder is deleted when the response closes (`backend/server.py` line 829).
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