File size: 12,971 Bytes
767a051 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 | """Deterministic corruption and commit-ancestry audit for TOM world stores."""
from __future__ import annotations
from collections import Counter
from pathlib import Path
from typing import Any
from .canonical import attach_hash, canonical_bytes
from .indexes import validate_index_record
from .store import COMMIT_SCHEMA, SNAPSHOT_SCHEMA, TRANSACTION_SCHEMA, WorldStore
AUDIT_SCHEMA = "TOM-WORLD-AUDIT-CERTIFICATE-0.2"
def _hash_ids(directory: Path, suffix: str) -> set[str]:
if not directory.exists():
return set()
result: set[str] = set()
for path in directory.glob("*" + suffix):
stem = path.name[:-len(suffix)] if suffix else path.name
if len(stem) == 64:
try:
int(stem, 16)
except ValueError:
continue
result.add("sha256:" + stem)
return result
def audit_store(
store: WorldStore,
*,
commit: str | None = None,
require_no_orphans: bool = False,
strict: bool = False,
) -> dict[str, Any]:
"""Audit a target commit, all ancestors, and all reachable immutable bytes.
The certificate is deterministic: it contains no duration, hostname, PID,
or absolute path. Repeated audits of the same bytes produce the same hash.
"""
# An audit is a disk-integrity operation and must not inherit cached parses
# from prior queries in the same process.
store.clear_caches()
errors: list[dict[str, str]] = []
warnings: list[dict[str, str]] = []
checks: list[dict[str, Any]] = []
def error(kind: str, ident: str, message: str) -> None:
errors.append({"kind": kind, "id": ident, "message": message})
def warning(kind: str, ident: str, message: str) -> None:
warnings.append({"kind": kind, "id": ident, "message": message})
try:
identity = store.validate()
checks.append({"name": "store_descriptor_and_seed", "valid": True, "seed_sha256": identity.sha256})
except Exception as exc:
identity = None
error("store", "descriptor", f"{type(exc).__name__}: {exc}")
checks.append({"name": "store_descriptor_and_seed", "valid": False})
target = commit or store.head
if target is None:
error("commit", "HEAD", "store has no target commit")
certificate = attach_hash({
"schema": AUDIT_SCHEMA,
"version": "0.2.0",
"target_commit": None,
"head": store.head,
"valid": False,
"checks": checks,
"counts": {},
"ancestry": [],
"errors": errors,
"warnings": warnings,
"orphans": {},
})
if strict:
raise ValueError("world audit failed: store has no target commit")
return certificate
reachable_commits: set[str] = set()
reachable_snapshots: set[str] = set()
reachable_indexes: set[str] = set()
reachable_transactions: set[str] = set()
reachable_objects: set[str] = set()
reachable_blobs: set[str] = set()
verified_objects: set[str] = set()
verified_blobs: set[str] = set()
ancestry: list[dict[str, Any]] = []
type_counts: Counter[str] = Counter()
record_references = 0
blob_references = 0
current: str | None = target
expected_sequence: int | None = None
seen: set[str] = set()
while current is not None:
if current in seen:
error("commit", current, "commit ancestry cycle")
break
seen.add(current)
reachable_commits.add(current)
try:
commit_record = store.read_commit(current)
except Exception as exc:
error("commit", current, f"{type(exc).__name__}: {exc}")
break
if commit_record.get("schema") != COMMIT_SCHEMA:
error("commit", current, "commit schema mismatch")
sequence = commit_record.get("sequence")
if isinstance(sequence, bool) or not isinstance(sequence, int) or sequence < 0:
error("commit", current, "commit sequence is invalid")
break
if expected_sequence is not None and sequence != expected_sequence:
error("commit", current, f"sequence discontinuity: {sequence} != {expected_sequence}")
expected_sequence = sequence - 1
if identity is not None and commit_record.get("seed_sha256") != "sha256:" + identity.sha256:
error("commit", current, "commit seed binding mismatch")
transaction_hash = str(commit_record.get("transaction_hash"))
transaction_valid = False
transaction_path = store._transaction_path(transaction_hash)
if transaction_path.is_file():
reachable_transactions.add(transaction_hash)
try:
transaction = store.read_transaction(transaction_hash)
transaction_valid = (
transaction.get("schema") == TRANSACTION_SCHEMA
and transaction.get("base_commit") == commit_record.get("parent")
and transaction.get("sequence") == sequence
and transaction.get("seed_sha256") == commit_record.get("seed_sha256")
)
if not transaction_valid:
error("transaction", transaction_hash, "transaction/commit metadata mismatch")
except Exception as exc:
error("transaction", transaction_hash, f"{type(exc).__name__}: {exc}")
else:
if commit_record.get("version") == "0.1.0":
warning("transaction", transaction_hash, "legacy 0.1 commit has no stored transaction body")
else:
error("transaction", transaction_hash, "stored transaction body is missing")
snapshot_hash = str(commit_record.get("snapshot_hash"))
reachable_snapshots.add(snapshot_hash)
try:
snapshot = store.read_snapshot(snapshot_hash)
except Exception as exc:
error("snapshot", snapshot_hash, f"{type(exc).__name__}: {exc}")
break
if snapshot.get("schema") != SNAPSHOT_SCHEMA:
error("snapshot", snapshot_hash, "snapshot schema mismatch")
if identity is not None and snapshot.get("seed_sha256") != "sha256:" + identity.sha256:
error("snapshot", snapshot_hash, "snapshot seed binding mismatch")
index_hash = snapshot.get("indexes_hash")
index_valid = False
index_rebuilt_equal = False
if isinstance(index_hash, str):
reachable_indexes.add(index_hash)
if commit_record.get("indexes_hash") not in (None, index_hash):
error("index", index_hash, "commit/snapshot index hash mismatch")
try:
index = store.read_index(index_hash)
validate_index_record(
index,
records={str(key): str(value) for key, value in snapshot["records"].items()},
seed_sha256=str(snapshot["seed_sha256"]),
)
index_valid = True
rebuilt = store.compute_indexes(commit=current)
index_rebuilt_equal = canonical_bytes(rebuilt) == canonical_bytes(index)
if not index_rebuilt_equal:
error("index", index_hash, "rebuilt index bytes differ from stored index")
except Exception as exc:
error("index", index_hash, f"{type(exc).__name__}: {exc}")
else:
warning("index", snapshot_hash, "legacy snapshot has no immutable secondary index")
snapshot_record_errors = 0
records = snapshot["records"]
for record_id in sorted(records):
record_references += 1
object_hash = str(records[record_id])
reachable_objects.add(object_hash)
try:
record = store._load_record_from_map(str(record_id), object_hash)
type_counts[str(record["record_type"])] += 1
missing = [dependency for dependency in record["dependencies"] if dependency not in records]
if missing:
snapshot_record_errors += 1
error("record", str(record_id), "unresolved dependencies: " + ", ".join(sorted(missing)))
verified_objects.add(object_hash)
except Exception as exc:
snapshot_record_errors += 1
error("record", str(record_id), f"{type(exc).__name__}: {exc}")
snapshot_blob_errors = 0
blobs = snapshot["blobs"]
for blob_id in sorted(blobs):
blob_references += 1
blob_hash = str(blobs[blob_id])
reachable_blobs.add(blob_hash)
if blob_hash in verified_blobs:
continue
try:
store.read_blob(blob_hash)
verified_blobs.add(blob_hash)
except Exception as exc:
snapshot_blob_errors += 1
error("blob", str(blob_id), f"{type(exc).__name__}: {exc}")
parent = commit_record.get("parent")
if sequence == 0 and parent is not None:
error("commit", current, "root sequence zero must have null parent")
if sequence > 0 and not isinstance(parent, str):
error("commit", current, "non-root commit must name a parent")
ancestry.append({
"commit": current,
"sequence": sequence,
"parent": parent,
"transaction_hash": transaction_hash,
"transaction_valid": transaction_valid,
"snapshot_hash": snapshot_hash,
"record_count": len(records),
"blob_count": len(blobs),
"record_errors": snapshot_record_errors,
"blob_errors": snapshot_blob_errors,
"indexes_hash": index_hash,
"index_valid": index_valid,
"index_rebuilt_byte_equal": index_rebuilt_equal,
})
current = str(parent) if isinstance(parent, str) else None
if ancestry and ancestry[-1]["sequence"] != 0:
error("commit", ancestry[-1]["commit"], "ancestry did not terminate at sequence zero")
if commit is None and target != store.head:
error("head", "HEAD", "audit target does not equal current HEAD")
disk_sets = {
"commits": _hash_ids(store.commits_dir, ".json"),
"snapshots": _hash_ids(store.snapshots_dir, ".json"),
"indexes": _hash_ids(store.indexes_dir, ".json"),
"transactions": _hash_ids(store.transactions_dir, ".json"),
"objects": _hash_ids(store.objects_dir, ".json"),
"blobs": _hash_ids(store.blobs_dir, ".bin"),
}
reachable_sets = {
"commits": reachable_commits,
"snapshots": reachable_snapshots,
"indexes": reachable_indexes,
"transactions": reachable_transactions,
"objects": reachable_objects,
"blobs": reachable_blobs,
}
orphan_record: dict[str, Any] = {}
for kind in sorted(disk_sets):
values = sorted(disk_sets[kind] - reachable_sets[kind])
orphan_record[kind] = {"count": len(values), "sample": values[:32]}
if require_no_orphans and values:
error("orphan", kind, f"{len(values)} unreachable immutable objects")
valid = not errors
checks.extend([
{"name": "commit_ancestry", "valid": bool(ancestry) and ancestry[-1]["sequence"] == 0},
{"name": "reachable_records", "valid": not any(item["kind"] == "record" for item in errors)},
{"name": "reachable_blobs", "valid": not any(item["kind"] == "blob" for item in errors)},
{"name": "immutable_indexes", "valid": not any(item["kind"] == "index" for item in errors)},
{"name": "stored_transactions", "valid": not any(item["kind"] == "transaction" for item in errors)},
])
certificate = attach_hash({
"schema": AUDIT_SCHEMA,
"version": "0.2.0",
"target_commit": target,
"head": store.head,
"valid": valid,
"checks": checks,
"counts": {
"commits": len(reachable_commits),
"snapshots": len(reachable_snapshots),
"indexes": len(reachable_indexes),
"transactions": len(reachable_transactions),
"unique_objects": len(verified_objects),
"record_references": record_references,
"unique_blobs": len(verified_blobs),
"blob_references": blob_references,
"record_types_across_snapshots": {key: type_counts[key] for key in sorted(type_counts)},
},
"ancestry": ancestry,
"errors": errors,
"warnings": warnings,
"orphans": orphan_record,
"require_no_orphans": require_no_orphans,
})
if strict and not valid:
summary = "; ".join(f"{item['kind']}:{item['id']}:{item['message']}" for item in errors[:8])
raise ValueError("world audit failed: " + summary)
return certificate
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