fix: consolidate _default_db_path to utils.py — closes #40

[Wolfvin]

Summary

Consolidates the default-db-path logic from 4 duplicated sites into a single helper in scripts/utils.py. Pure refactor — no behavior change. The default path is still <workspace>/.codelens/codelens.db.

Before this PR, the same one-liner os.path.join(workspace, ".codelens", "codelens.db") lived in four places:

File	Location	Form
scripts/commands/graph_schema.py	L29-31	_default_db_path() function
scripts/graph_model.py	L161-163	_default_db_path() function (identical copy)
scripts/persistent_registry.py	L132-133	inline os.path.join in PersistentRegistry.__init__
scripts/persistent_registry.py	L858	inline os.path.join in db_exists()

Any future change to the default path — e.g., honoring a CODELENS_DB_PATH env var, or moving the db out of .codelens/ — had to be made in four places. Forgetting one would silently create a bug where graph-schema and graph_model queries hit different databases.

Why

Closes #40.

Single source of truth. The issue itself flags the drift risk: "Any future change to the default path ... must be made in both places. Forgetting one creates a silent bug where graph-schema and graph_model queries hit different databases."

This PR extracts the helper to utils.default_db_path(workspace: str) -> str and replaces all four call sites with imports / calls to it. Future changes to the path logic now happen in exactly one place.

Files changed

File	Change
scripts/utils.py	Added default_db_path(workspace: str) -> str helper with full docstring (single source of truth).
scripts/commands/graph_schema.py	Deleted local _default_db_path def; added from utils import default_db_path; updated the one call site in get_graph_schema.
scripts/graph_model.py	Replaced local _default_db_path def with from utils import default_db_path + a backward-compat alias _default_db_path = default_db_path (preserves the underscore-private symbol imported by tests/test_graph_model.py and tests/test_hybrid_type_resolver.py — both outside the file allowlist for this PR, so removing the symbol would have broken them). Internal call sites now use the public name.
scripts/persistent_registry.py	__init__ and db_exists() now call default_db_path(workspace). DB_FILENAME = "codelens.db" constant preserved as a module-level export with a comment noting it's kept for backwards-compat with external importers (no longer used internally).
tests/test_graph_model.py	Added TestDefaultDbPathConsistency.test_default_db_path_consistency — asserts all three call sites (utils, graph_model alias, graph_schema import) resolve to the same path for the same workspace, and that graph_schema.default_db_path is utils.default_db_path (same callable, not a re-definition). Also covers PersistentRegistry default and db_exists returning False for a non-existent workspace.

No other stacks or files touched. Total: 5 files, +115 / −17.

Architectural decisions

1. Why keep graph_model._default_db_path as an alias instead of deleting it. The constraint "Hanya touch file: ... tests/test_graph_model.py" plus scope-discipline forbids modifying tests/test_hybrid_type_resolver.py, which imports _default_db_path from graph_model in 9 places. Deleting the symbol would break those imports and force touching a file outside the allow-list. The alias _default_db_path = default_db_path preserves the convention-based API while making utils.default_db_path the single source of truth for the path logic. The new test asserts the alias is the same callable, so any future drift (e.g. someone re-defining _default_db_path locally) will be caught.

2. Why also update db_exists() in persistent_registry.py (not just __init__). The DoD explicitly calls out __init__, but db_exists() at L858 is a second path-construction site in the same file using the same os.path.join(workspace, ".codelens", DB_FILENAME) pattern. Leaving it untouched would defeat the single-source-of-truth goal (the issue text says "three sources of truth actually"). It's the same file already in scope, so updating it keeps the refactor consistent. Noted explicitly here for reviewer awareness.

3. Why preserve DB_FILENAME. The constraint says "Preserve DB_FILENAME = "codelens.db" constant in persistent_registry.py if ada code lain yang pakai". A repo-wide grep shows it's no longer referenced anywhere internally after this refactor, but it's a module-level public symbol that external plugins/importers could depend on. Keeping it (with a comment) is the conservative choice; deleting it would be a separate breaking-API decision for the BOS to make.

Verification

1. Functional test — new TestDefaultDbPathConsistency proves the consolidation works

$ python3 -m pytest tests/test_graph_model.py::TestDefaultDbPathConsistency -v
============================== test session starts ==============================
platform linux -- Python 3.12.13, pytest-9.1.2, ...
collected 1 item

tests/test_graph_model.py::TestDefaultDbPathConsistency::test_default_db_path_consistency PASSED

The test asserts:

• graph_model._default_db_path(ws) == utils.default_db_path(ws) (alias works)
• graph_schema.default_db_path is utils.default_db_path (same callable, not a re-definition)
• graph_schema.default_db_path(ws) == utils.default_db_path(ws) (resolves to same path)
• PersistentRegistry(ws).db_path == utils.default_db_path(ws) (registry uses the helper)
• db_exists(ws) is False for a non-existent workspace (helper doesn't crash)
• Canonical path ends with .codelens/codelens.db (sanity)

2. All existing tests still pass — no regressions in any storage-related test

$ python3 -m pytest tests/test_graph_model.py tests/test_graph_incremental.py \
    tests/test_hybrid_type_resolver.py tests/test_persistent_registry.py \
    tests/test_persistent_registry_extra.py tests/test_registry.py
..................................................... [ 24%]
..................................................... [ 48%]
..................................................... [ 72%]
..................................................... [ 96%]
...........                                          [100%]
299 passed in 4.64s

$ python3 -m pytest tests/test_graph_model.py -v
============================== 21 passed in 1.27s ==============================

(20 existing + 1 new = 21.)

$ python3 -m pytest tests/test_cli.py
15 passed in 1.15s

Also ran broader engine + parser suites (architecture, circular, complexity, dataflow, deadcode, history, smell, search, secrets, semantic, perfhint, codelens, css/html/js/rust parsers, hybrid engine, vuln_staleness): 393 passed, 1 pre-existing failure (see "Out of scope" below), 12 skipped.

3. DoD #8 — python3 -c "from utils import default_db_path; print(default_db_path('/tmp/test'))"

$ cd scripts && python3 -c "from utils import default_db_path; print(default_db_path('/tmp/test'))"
/tmp/test/.codelens/codelens.db

4. DoD #7 — python3 scripts/codelens.py graph-schema works on test fixtures

$ python3 scripts/codelens.py graph-schema benchmarks/fixtures/clean_app
[CodeLens] Auto-detected workspace: .../clean_app
{
  "status": "ok",
  "workspace": ".../clean_app",
  "nodes": 0,
  "edges": 0,
  "node_types": {},
  "edge_types": {},
  "indexes": 0,
  "note": "database does not exist; run 'scan' first"
}

$ python3 scripts/codelens.py scan benchmarks/fixtures/clean_app
{..."outline_generated": true, "history_snapshot_saved": true...}

$ python3 scripts/codelens.py graph-schema benchmarks/fixtures/clean_app
{
  "status": "ok",
  "workspace": ".../clean_app",
  "nodes": 31,
  "edges": 134,
  "node_types": {"function": 30, "class": 1},
  "edge_types": {"CALLS": 97, "IMPORTS": 37},
  "indexes": 6
}

graph-schema works both pre-scan (zero-shaped) and post-scan (31 nodes / 134 edges / 6 indexes — same as before refactor). The .codelens/ artifacts were cleaned up after the test so they don't pollute the PR.

5. All modules import cleanly + alias is the same callable

$ python3 -c "
import sys; sys.path.insert(0, 'scripts')
import utils, graph_model, persistent_registry
from commands import graph_schema
print('graph_model._default_db_path is utils.default_db_path:',
       graph_model._default_db_path is utils.default_db_path)
print('graph_schema.default_db_path is utils.default_db_path:',
       graph_schema.default_db_path is utils.default_db_path)
"
graph_model._default_db_path is utils.default_db_path: True
graph_schema.default_db_path is utils.default_db_path: True

6. PEP 8 / line length

All lines I added respect the 120-character limit (verified by a per-line check on the diff). The 5 pre-existing 120+ char lines in scripts/utils.py (L354-362, in check_gitignore_health recommendations) are untouched by this PR — out of scope per scope-discipline.

7. Byte-compile check

$ python3 -m py_compile scripts/utils.py scripts/commands/graph_schema.py \
    scripts/graph_model.py scripts/persistent_registry.py tests/test_graph_model.py
$ echo $?
0

Out of scope (not fixed)

• tests/test_vuln_staleness.py::test_vulnerable_app_has_stale_cache_info fails on both main and this branch — pre-existing date-based flake (WARNING: Built-in VULN_DB is 485 days old (last updated 2025-02-28)). Verified by checking out main and re-running the same test: same failure, same warning. Unrelated to this refactor.

Issue link

Closes #40: #40

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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