ledger_io.py
python
sha256:a78e7e5a8740e03315f325d19edeb3aa1b306b3337d04abbaa9a9e0f3bbeb7a1
docs: MuseHub-first before ISR #74 — staging solidify NEXT
Human
1 day ago
| 1 | """JSONL ledger IO helpers (§K9.7).""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | import json |
| 6 | import os |
| 7 | import tempfile |
| 8 | from pathlib import Path |
| 9 | from typing import Any |
| 10 | |
| 11 | |
| 12 | class LedgerIOError(Exception): |
| 13 | """Raised when ledger file IO fails.""" |
| 14 | |
| 15 | def __init__(self, message: str) -> None: |
| 16 | super().__init__(message) |
| 17 | |
| 18 | |
| 19 | def split_jsonl_lines(text: str) -> list[str]: |
| 20 | """Split JSONL text and ignore a trailing empty segment after final LF.""" |
| 21 | if not text: |
| 22 | return [] |
| 23 | lines = text.split("\n") |
| 24 | if lines and lines[-1] == "": |
| 25 | lines = lines[:-1] |
| 26 | return lines |
| 27 | |
| 28 | |
| 29 | def parse_jsonl_text(text: str) -> list[dict[str, Any]]: |
| 30 | """Parse JSONL records; malformed JSON raises ``ValueError``.""" |
| 31 | records: list[dict[str, Any]] = [] |
| 32 | for index, line in enumerate(split_jsonl_lines(text)): |
| 33 | if not line.strip(): |
| 34 | continue |
| 35 | try: |
| 36 | obj = json.loads(line) |
| 37 | except json.JSONDecodeError as exc: |
| 38 | raise ValueError(f"malformed JSONL at line {index + 1}: {exc}") from exc |
| 39 | if not isinstance(obj, dict): |
| 40 | raise ValueError(f"ledger line {index + 1} must be a JSON object") |
| 41 | records.append(obj) |
| 42 | return records |
| 43 | |
| 44 | |
| 45 | def read_ledger_entries(path: Path) -> list[dict[str, Any]]: |
| 46 | """Read ledger entries; missing or empty file returns [].""" |
| 47 | if not path.is_file(): |
| 48 | return [] |
| 49 | text = path.read_text(encoding="utf-8") |
| 50 | if not text: |
| 51 | return [] |
| 52 | return parse_jsonl_text(text) |
| 53 | |
| 54 | |
| 55 | def serialize_entry(entry: dict[str, Any]) -> str: |
| 56 | """Serialize one ledger entry as a single JSONL line with trailing LF.""" |
| 57 | return json.dumps(entry, ensure_ascii=False, separators=(",", ":"), sort_keys=True) + "\n" |
| 58 | |
| 59 | |
| 60 | def atomic_append_lines(path: Path, lines: list[str]) -> None: |
| 61 | """Append lines atomically; on failure leave prior bytes unchanged.""" |
| 62 | path.parent.mkdir(parents=True, exist_ok=True) |
| 63 | if not path.exists(): |
| 64 | path.write_text("", encoding="utf-8") |
| 65 | |
| 66 | existing = path.read_text(encoding="utf-8") |
| 67 | new_content = existing + "".join(lines) |
| 68 | fd, temp_name = tempfile.mkstemp(prefix=".ledger-", dir=path.parent) |
| 69 | temp_path = Path(temp_name) |
| 70 | try: |
| 71 | with os.fdopen(fd, "w", encoding="utf-8") as handle: |
| 72 | handle.write(new_content) |
| 73 | handle.flush() |
| 74 | os.fsync(handle.fileno()) |
| 75 | os.replace(temp_path, path) |
| 76 | except OSError as exc: |
| 77 | if temp_path.exists(): |
| 78 | temp_path.unlink(missing_ok=True) |
| 79 | raise LedgerIOError(f"ledger write failed: {exc}") from exc |
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2 commits
sha256:a78e7e5a8740e03315f325d19edeb3aa1b306b3337d04abbaa9a9e0f3bbeb7a1
docs: MuseHub-first before ISR #74 — staging solidify NEXT
Human
1 day ago
sha256:4671b7f787ddbe63ced31c895b688c77ab495653b65a730b423329f26b3c1439
feat: K1-P1 complete — agent provenance, build-verification…
Sonnet 4.6
patch
52 days ago