test_plumbing_stress.py
python
| 1 | """Stress and scale tests for the Muse plumbing layer. |
| 2 | |
| 3 | These tests exercise plumbing commands at a scale that would reveal |
| 4 | O(n²) performance regressions, memory leaks, and missing edge-case |
| 5 | handling. Every test in this module is designed to complete in under |
| 6 | 10 seconds on a modern laptop when running from an in-memory temp |
| 7 | directory — if any test consistently takes longer, it signals a |
| 8 | performance regression worth investigating. |
| 9 | |
| 10 | Scenarios: |
| 11 | - commit-graph BFS on a 500-commit linear history |
| 12 | - merge-base on a 300-deep dag (shared ancestor at the root) |
| 13 | - name-rev multi-source BFS on a 200-commit diamond graph |
| 14 | - snapshot-diff on manifests with 2000 files each |
| 15 | - verify-object on 200 objects |
| 16 | - ls-files on a 2000-file snapshot |
| 17 | - for-each-ref on 100 branches |
| 18 | - show-ref on 100 branches |
| 19 | - pack-objects → unpack-objects with 100 commits and 100 objects |
| 20 | - read-commit on 200 sequential commits |
| 21 | """ |
| 22 | |
| 23 | from __future__ import annotations |
| 24 | |
| 25 | import datetime |
| 26 | import hashlib |
| 27 | import json |
| 28 | import pathlib |
| 29 | |
| 30 | from typer.testing import CliRunner |
| 31 | |
| 32 | from muse.cli.app import cli |
| 33 | from muse.core.object_store import write_object |
| 34 | from muse.core.store import CommitRecord, SnapshotRecord, write_commit, write_snapshot |
| 35 | |
| 36 | runner = CliRunner() |
| 37 | |
| 38 | |
| 39 | # --------------------------------------------------------------------------- |
| 40 | # Helpers |
| 41 | # --------------------------------------------------------------------------- |
| 42 | |
| 43 | |
| 44 | def _sha(tag: str) -> str: |
| 45 | return hashlib.sha256(tag.encode()).hexdigest() |
| 46 | |
| 47 | |
| 48 | def _sha_bytes(data: bytes) -> str: |
| 49 | return hashlib.sha256(data).hexdigest() |
| 50 | |
| 51 | |
| 52 | def _init_repo(path: pathlib.Path) -> pathlib.Path: |
| 53 | muse = path / ".muse" |
| 54 | (muse / "commits").mkdir(parents=True) |
| 55 | (muse / "snapshots").mkdir(parents=True) |
| 56 | (muse / "objects").mkdir(parents=True) |
| 57 | (muse / "refs" / "heads").mkdir(parents=True) |
| 58 | (muse / "HEAD").write_text("ref: refs/heads/main", encoding="utf-8") |
| 59 | (muse / "repo.json").write_text( |
| 60 | json.dumps({"repo_id": "stress-repo", "domain": "midi"}), encoding="utf-8" |
| 61 | ) |
| 62 | return path |
| 63 | |
| 64 | |
| 65 | def _env(repo: pathlib.Path) -> dict[str, str]: |
| 66 | return {"MUSE_REPO_ROOT": str(repo)} |
| 67 | |
| 68 | |
| 69 | def _snap(repo: pathlib.Path, manifest: dict[str, str] | None = None, tag: str = "s") -> str: |
| 70 | m = manifest or {} |
| 71 | sid = _sha(f"snap-{tag}") |
| 72 | write_snapshot( |
| 73 | repo, |
| 74 | SnapshotRecord( |
| 75 | snapshot_id=sid, |
| 76 | manifest=m, |
| 77 | created_at=datetime.datetime(2026, 1, 1, tzinfo=datetime.timezone.utc), |
| 78 | ), |
| 79 | ) |
| 80 | return sid |
| 81 | |
| 82 | |
| 83 | def _commit_raw( |
| 84 | repo: pathlib.Path, |
| 85 | cid: str, |
| 86 | sid: str, |
| 87 | message: str, |
| 88 | branch: str = "main", |
| 89 | parent: str | None = None, |
| 90 | parent2: str | None = None, |
| 91 | ) -> None: |
| 92 | write_commit( |
| 93 | repo, |
| 94 | CommitRecord( |
| 95 | commit_id=cid, |
| 96 | repo_id="stress-repo", |
| 97 | branch=branch, |
| 98 | snapshot_id=sid, |
| 99 | message=message, |
| 100 | committed_at=datetime.datetime(2026, 1, 1, tzinfo=datetime.timezone.utc), |
| 101 | author="stress-tester", |
| 102 | parent_commit_id=parent, |
| 103 | parent2_commit_id=parent2, |
| 104 | ), |
| 105 | ) |
| 106 | |
| 107 | |
| 108 | def _set_branch(repo: pathlib.Path, branch: str, cid: str) -> None: |
| 109 | ref = repo / ".muse" / "refs" / "heads" / branch |
| 110 | ref.parent.mkdir(parents=True, exist_ok=True) |
| 111 | ref.write_text(cid, encoding="utf-8") |
| 112 | |
| 113 | |
| 114 | def _linear_chain(repo: pathlib.Path, n: int, sid: str, branch: str = "main") -> list[str]: |
| 115 | """Build a linear chain of n commits. Returns list root→tip.""" |
| 116 | cids: list[str] = [] |
| 117 | parent: str | None = None |
| 118 | for i in range(n): |
| 119 | cid = _sha(f"linear-{branch}-{i}") |
| 120 | _commit_raw(repo, cid, sid, f"commit {i}", branch=branch, parent=parent) |
| 121 | cids.append(cid) |
| 122 | parent = cid |
| 123 | _set_branch(repo, branch, cids[-1]) |
| 124 | return cids |
| 125 | |
| 126 | |
| 127 | def _obj(repo: pathlib.Path, tag: str) -> str: |
| 128 | content = tag.encode() |
| 129 | oid = _sha_bytes(content) |
| 130 | write_object(repo, oid, content) |
| 131 | return oid |
| 132 | |
| 133 | |
| 134 | # --------------------------------------------------------------------------- |
| 135 | # Stress: commit-graph |
| 136 | # --------------------------------------------------------------------------- |
| 137 | |
| 138 | |
| 139 | class TestCommitGraphStress: |
| 140 | def test_500_commit_linear_chain_full_traversal(self, tmp_path: pathlib.Path) -> None: |
| 141 | repo = _init_repo(tmp_path) |
| 142 | sid = _snap(repo) |
| 143 | cids = _linear_chain(repo, 500, sid) |
| 144 | result = runner.invoke(cli, ["plumbing", "commit-graph"], env=_env(repo)) |
| 145 | assert result.exit_code == 0, result.output |
| 146 | data = json.loads(result.stdout) |
| 147 | assert data["count"] == 500 |
| 148 | assert data["truncated"] is False |
| 149 | |
| 150 | def test_500_commit_chain_stop_at_midpoint(self, tmp_path: pathlib.Path) -> None: |
| 151 | repo = _init_repo(tmp_path) |
| 152 | sid = _snap(repo) |
| 153 | cids = _linear_chain(repo, 500, sid) |
| 154 | result = runner.invoke( |
| 155 | cli, |
| 156 | ["plumbing", "commit-graph", "--tip", cids[499], "--stop-at", cids[249]], |
| 157 | env=_env(repo), |
| 158 | ) |
| 159 | assert result.exit_code == 0 |
| 160 | data = json.loads(result.stdout) |
| 161 | assert data["count"] == 250 |
| 162 | |
| 163 | def test_count_flag_on_500_commits(self, tmp_path: pathlib.Path) -> None: |
| 164 | repo = _init_repo(tmp_path) |
| 165 | sid = _snap(repo) |
| 166 | _linear_chain(repo, 500, sid) |
| 167 | result = runner.invoke(cli, ["plumbing", "commit-graph", "--count"], env=_env(repo)) |
| 168 | assert result.exit_code == 0 |
| 169 | data = json.loads(result.stdout) |
| 170 | assert data["count"] == 500 |
| 171 | assert "commits" not in data # --count suppresses node list |
| 172 | |
| 173 | |
| 174 | # --------------------------------------------------------------------------- |
| 175 | # Stress: merge-base |
| 176 | # --------------------------------------------------------------------------- |
| 177 | |
| 178 | |
| 179 | class TestMergeBaseStress: |
| 180 | def test_merge_base_300_deep_shared_root(self, tmp_path: pathlib.Path) -> None: |
| 181 | repo = _init_repo(tmp_path) |
| 182 | sid = _snap(repo) |
| 183 | |
| 184 | # Shared root |
| 185 | root_cid = _sha("shared-root") |
| 186 | _commit_raw(repo, root_cid, sid, "root") |
| 187 | |
| 188 | # Two 150-commit chains from the same root |
| 189 | main_chain = [root_cid] |
| 190 | feat_chain = [root_cid] |
| 191 | for i in range(150): |
| 192 | mc = _sha(f"main-{i}") |
| 193 | _commit_raw(repo, mc, sid, f"main-{i}", branch="main", parent=main_chain[-1]) |
| 194 | main_chain.append(mc) |
| 195 | fc = _sha(f"feat-{i}") |
| 196 | _commit_raw(repo, fc, sid, f"feat-{i}", branch="feat", parent=feat_chain[-1]) |
| 197 | feat_chain.append(fc) |
| 198 | |
| 199 | _set_branch(repo, "main", main_chain[-1]) |
| 200 | _set_branch(repo, "feat", feat_chain[-1]) |
| 201 | (repo / ".muse" / "HEAD").write_text("ref: refs/heads/main", encoding="utf-8") |
| 202 | |
| 203 | result = runner.invoke( |
| 204 | cli, ["plumbing", "merge-base", "main", "feat"], env=_env(repo) |
| 205 | ) |
| 206 | assert result.exit_code == 0 |
| 207 | data = json.loads(result.stdout) |
| 208 | assert data["merge_base"] == root_cid |
| 209 | |
| 210 | |
| 211 | # --------------------------------------------------------------------------- |
| 212 | # Stress: name-rev |
| 213 | # --------------------------------------------------------------------------- |
| 214 | |
| 215 | |
| 216 | class TestNameRevStress: |
| 217 | def test_name_rev_200_commit_chain_all_named(self, tmp_path: pathlib.Path) -> None: |
| 218 | repo = _init_repo(tmp_path) |
| 219 | sid = _snap(repo) |
| 220 | cids = _linear_chain(repo, 200, sid) |
| 221 | |
| 222 | result = runner.invoke(cli, ["plumbing", "name-rev", *cids], env=_env(repo)) |
| 223 | assert result.exit_code == 0 |
| 224 | data = json.loads(result.stdout) |
| 225 | assert len(data["results"]) == 200 |
| 226 | for entry in data["results"]: |
| 227 | assert not entry["undefined"] |
| 228 | |
| 229 | def test_name_rev_tip_has_no_tilde_suffix(self, tmp_path: pathlib.Path) -> None: |
| 230 | """distance=0 means the tip is the branch tip itself; name is bare branch name.""" |
| 231 | repo = _init_repo(tmp_path) |
| 232 | sid = _snap(repo) |
| 233 | cids = _linear_chain(repo, 10, sid) |
| 234 | tip = cids[-1] |
| 235 | |
| 236 | result = runner.invoke(cli, ["plumbing", "name-rev", tip], env=_env(repo)) |
| 237 | assert result.exit_code == 0 |
| 238 | entry = json.loads(result.stdout)["results"][0] |
| 239 | # name-rev emits "<branch>" (no ~0) for the exact branch tip. |
| 240 | assert entry["name"] == "main" |
| 241 | assert entry["distance"] == 0 |
| 242 | |
| 243 | |
| 244 | # --------------------------------------------------------------------------- |
| 245 | # Stress: snapshot-diff |
| 246 | # --------------------------------------------------------------------------- |
| 247 | |
| 248 | |
| 249 | class TestSnapshotDiffStress: |
| 250 | def test_diff_2000_file_manifests(self, tmp_path: pathlib.Path) -> None: |
| 251 | repo = _init_repo(tmp_path) |
| 252 | oid = _sha("shared-blob") |
| 253 | |
| 254 | # Manifest A: 2000 files |
| 255 | manifest_a = {f"track_{i:04d}.mid": oid for i in range(2000)} |
| 256 | # Manifest B: same 2000 files but first 200 have new IDs (modified) |
| 257 | new_oid = _sha("new-blob") |
| 258 | manifest_b = {f"track_{i:04d}.mid": (new_oid if i < 200 else oid) for i in range(2000)} |
| 259 | |
| 260 | sid_a = _sha("big-snap-a") |
| 261 | sid_b = _sha("big-snap-b") |
| 262 | write_snapshot( |
| 263 | repo, |
| 264 | SnapshotRecord( |
| 265 | snapshot_id=sid_a, |
| 266 | manifest=manifest_a, |
| 267 | created_at=datetime.datetime(2026, 1, 1, tzinfo=datetime.timezone.utc), |
| 268 | ), |
| 269 | ) |
| 270 | write_snapshot( |
| 271 | repo, |
| 272 | SnapshotRecord( |
| 273 | snapshot_id=sid_b, |
| 274 | manifest=manifest_b, |
| 275 | created_at=datetime.datetime(2026, 1, 2, tzinfo=datetime.timezone.utc), |
| 276 | ), |
| 277 | ) |
| 278 | |
| 279 | result = runner.invoke(cli, ["plumbing", "snapshot-diff", sid_a, sid_b], env=_env(repo)) |
| 280 | assert result.exit_code == 0 |
| 281 | data = json.loads(result.stdout) |
| 282 | assert data["total_changes"] == 200 |
| 283 | assert len(data["modified"]) == 200 |
| 284 | assert data["added"] == [] |
| 285 | assert data["deleted"] == [] |
| 286 | |
| 287 | |
| 288 | # --------------------------------------------------------------------------- |
| 289 | # Stress: verify-object |
| 290 | # --------------------------------------------------------------------------- |
| 291 | |
| 292 | |
| 293 | class TestVerifyObjectStress: |
| 294 | def test_200_objects_all_verified(self, tmp_path: pathlib.Path) -> None: |
| 295 | repo = _init_repo(tmp_path) |
| 296 | oids = [_obj(repo, f"stress-obj-{i}") for i in range(200)] |
| 297 | result = runner.invoke(cli, ["plumbing", "verify-object", *oids], env=_env(repo)) |
| 298 | assert result.exit_code == 0 |
| 299 | data = json.loads(result.stdout) |
| 300 | assert data["all_ok"] is True |
| 301 | assert data["checked"] == 200 |
| 302 | assert data["failed"] == 0 |
| 303 | |
| 304 | def test_verify_1mib_object_no_crash(self, tmp_path: pathlib.Path) -> None: |
| 305 | repo = _init_repo(tmp_path) |
| 306 | content = b"Z" * (1024 * 1024) |
| 307 | oid = _sha_bytes(content) |
| 308 | write_object(repo, oid, content) |
| 309 | result = runner.invoke(cli, ["plumbing", "verify-object", oid], env=_env(repo)) |
| 310 | assert result.exit_code == 0 |
| 311 | assert json.loads(result.stdout)["all_ok"] is True |
| 312 | |
| 313 | |
| 314 | # --------------------------------------------------------------------------- |
| 315 | # Stress: ls-files |
| 316 | # --------------------------------------------------------------------------- |
| 317 | |
| 318 | |
| 319 | class TestLsFilesStress: |
| 320 | def test_ls_files_2000_file_snapshot(self, tmp_path: pathlib.Path) -> None: |
| 321 | repo = _init_repo(tmp_path) |
| 322 | oid = _sha("common-oid") |
| 323 | manifest = {f"track_{i:04d}.mid": oid for i in range(2000)} |
| 324 | sid = _snap(repo, manifest, "big") |
| 325 | cid = _sha("big-commit") |
| 326 | _commit_raw(repo, cid, sid, "big manifest", branch="main") |
| 327 | _set_branch(repo, "main", cid) |
| 328 | |
| 329 | result = runner.invoke(cli, ["plumbing", "ls-files"], env=_env(repo)) |
| 330 | assert result.exit_code == 0 |
| 331 | data = json.loads(result.stdout) |
| 332 | assert data["file_count"] == 2000 |
| 333 | |
| 334 | |
| 335 | # --------------------------------------------------------------------------- |
| 336 | # Stress: for-each-ref and show-ref |
| 337 | # --------------------------------------------------------------------------- |
| 338 | |
| 339 | |
| 340 | class TestRefCommandsStress: |
| 341 | def _build_100_branches(self, repo: pathlib.Path) -> None: |
| 342 | sid = _snap(repo, tag="multi-branch") |
| 343 | for i in range(100): |
| 344 | branch = f"feature-{i:03d}" |
| 345 | cid = _sha(f"branch-tip-{i}") |
| 346 | _commit_raw(repo, cid, sid, f"tip of {branch}", branch=branch) |
| 347 | _set_branch(repo, branch, cid) |
| 348 | |
| 349 | def test_for_each_ref_100_branches(self, tmp_path: pathlib.Path) -> None: |
| 350 | repo = _init_repo(tmp_path) |
| 351 | self._build_100_branches(repo) |
| 352 | result = runner.invoke(cli, ["plumbing", "for-each-ref"], env=_env(repo)) |
| 353 | assert result.exit_code == 0 |
| 354 | data = json.loads(result.stdout) |
| 355 | assert len(data["refs"]) == 100 |
| 356 | |
| 357 | def test_show_ref_100_branches(self, tmp_path: pathlib.Path) -> None: |
| 358 | repo = _init_repo(tmp_path) |
| 359 | self._build_100_branches(repo) |
| 360 | result = runner.invoke(cli, ["plumbing", "show-ref"], env=_env(repo)) |
| 361 | assert result.exit_code == 0 |
| 362 | data = json.loads(result.stdout) |
| 363 | assert data["count"] == 100 |
| 364 | |
| 365 | def test_for_each_ref_pattern_filter_on_100(self, tmp_path: pathlib.Path) -> None: |
| 366 | repo = _init_repo(tmp_path) |
| 367 | self._build_100_branches(repo) |
| 368 | result = runner.invoke( |
| 369 | cli, |
| 370 | ["plumbing", "for-each-ref", "--pattern", "refs/heads/feature-00*"], |
| 371 | env=_env(repo), |
| 372 | ) |
| 373 | assert result.exit_code == 0 |
| 374 | data = json.loads(result.stdout) |
| 375 | # feature-000 through feature-009 = 10 branches |
| 376 | assert len(data["refs"]) == 10 |
| 377 | |
| 378 | |
| 379 | # --------------------------------------------------------------------------- |
| 380 | # Stress: pack-objects → unpack-objects |
| 381 | # --------------------------------------------------------------------------- |
| 382 | |
| 383 | |
| 384 | class TestPackUnpackStress: |
| 385 | def test_100_commit_100_object_round_trip(self, tmp_path: pathlib.Path) -> None: |
| 386 | from muse.core.object_store import has_object |
| 387 | from muse.core.store import read_commit |
| 388 | |
| 389 | src = _init_repo(tmp_path / "src") |
| 390 | dst = _init_repo(tmp_path / "dst") |
| 391 | |
| 392 | # Build 100 objects |
| 393 | oids = [_obj(src, f"blob-{i}") for i in range(100)] |
| 394 | manifest = {f"f{i}.mid": oids[i] for i in range(100)} |
| 395 | sid = _snap(src, manifest, "big-pack") |
| 396 | |
| 397 | # Build 100-commit linear chain referencing that snapshot |
| 398 | parent: str | None = None |
| 399 | cids: list[str] = [] |
| 400 | for i in range(100): |
| 401 | cid = _sha(f"pack-commit-{i}") |
| 402 | _commit_raw(src, cid, sid, f"pack-{i}", parent=parent) |
| 403 | cids.append(cid) |
| 404 | parent = cid |
| 405 | _set_branch(src, "main", cids[-1]) |
| 406 | |
| 407 | # Pack tip → unpack into dst |
| 408 | pack_result = runner.invoke( |
| 409 | cli, ["plumbing", "pack-objects", cids[-1]], env=_env(src) |
| 410 | ) |
| 411 | assert pack_result.exit_code == 0 |
| 412 | |
| 413 | unpack_result = runner.invoke( |
| 414 | cli, |
| 415 | ["plumbing", "unpack-objects"], |
| 416 | input=pack_result.stdout, |
| 417 | env=_env(dst), |
| 418 | ) |
| 419 | assert unpack_result.exit_code == 0 |
| 420 | counts = json.loads(unpack_result.stdout) |
| 421 | assert counts["commits_written"] == 100 |
| 422 | assert counts["objects_written"] == 100 |
| 423 | |
| 424 | for cid in cids: |
| 425 | assert read_commit(dst, cid) is not None |
| 426 | for oid in oids: |
| 427 | assert has_object(dst, oid) |
| 428 | |
| 429 | |
| 430 | # --------------------------------------------------------------------------- |
| 431 | # Stress: read-commit sequential |
| 432 | # --------------------------------------------------------------------------- |
| 433 | |
| 434 | |
| 435 | class TestReadCommitStress: |
| 436 | def test_200_commits_all_readable(self, tmp_path: pathlib.Path) -> None: |
| 437 | repo = _init_repo(tmp_path) |
| 438 | sid = _snap(repo) |
| 439 | cids = _linear_chain(repo, 200, sid) |
| 440 | for cid in cids: |
| 441 | result = runner.invoke(cli, ["plumbing", "read-commit", cid], env=_env(repo)) |
| 442 | assert result.exit_code == 0 |
| 443 | data = json.loads(result.stdout) |
| 444 | assert data["commit_id"] == cid |