205 lines
7.9 KiB
Python
205 lines
7.9 KiB
Python
"""Private local filesystem implementation of the session repository contract."""
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from __future__ import annotations
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import hashlib
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import json
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import os
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import re
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import shutil
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import tempfile
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import uuid
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from pathlib import Path
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from typing import Sequence
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import portalocker
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import yaml
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from tht.decisions import DecisionInput, DecisionRecord, append_decisions, list_decisions
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from tht.session.models import PrincipalContext, SessionManifest, SessionSnapshot
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from tht.session.store import MANIFEST, SessionError
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_ARTIFACT_FILES = {
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"question": "question.md",
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"schema_linking": "schema_linking.json",
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"sql_final": "sql_final.sql",
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"validation_report": "validation_report.md",
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"retrieval_pack": "retrieval_pack.md",
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"cte_tests": "cte_tests.json",
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}
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_ARTIFACT_KEYS = {filename: key for key, filename in _ARTIFACT_FILES.items()}
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_SAFE_CTE_NAME = re.compile(r"[A-Za-z0-9_-]+\Z")
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class FilesystemSessionRepository:
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"""Readable phase documents under one private local user's ThothII home."""
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def __init__(self, home: Path, workspace: str, principal: PrincipalContext):
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self.home = Path(home).expanduser()
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self.workspace = workspace
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self.principal = principal
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self.root = self.home / "workspaces" / workspace / "sessions"
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@property
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def preferences_path(self) -> Path:
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digest = hashlib.sha256(
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f"{self.principal.issuer}\0{self.principal.subject}".encode()
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).hexdigest()
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return self.home / "principals" / digest / "preferences.json"
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def create(self, manifest: SessionManifest) -> SessionSnapshot:
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self._require_uuid4(manifest.id)
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session_dir = self.root / manifest.id
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with self._lock(session_dir):
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if (session_dir / MANIFEST).exists():
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raise SessionError(f"Sessione esiste gia': {manifest.id}")
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self._private_directory(session_dir)
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self._write_manifest(session_dir, manifest)
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return self.get(manifest.id)
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def get(self, session_id: str) -> SessionSnapshot:
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session_dir = self._session_dir(session_id)
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manifest_path = session_dir / MANIFEST
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if not manifest_path.exists():
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raise SessionError(f"Sessione non trovata: {session_id} (atteso {manifest_path})")
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manifest = SessionManifest.from_yaml(manifest_path)
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artifacts = self._read_artifacts(session_dir)
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return SessionSnapshot(
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principal=self.principal,
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manifest=manifest,
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artifacts=artifacts,
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decisions=list_decisions(session_dir),
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)
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def save_manifest(self, manifest: SessionManifest) -> SessionSnapshot:
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session_dir = self._session_dir(manifest.id)
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with self._lock(session_dir):
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self._require_existing(session_dir, manifest.id)
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self._write_manifest(session_dir, manifest)
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return self.get(manifest.id)
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def read_artifact(self, session_id: str, key: str) -> str | None:
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session_dir = self._session_dir(session_id)
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self._require_existing(session_dir, session_id)
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path = self._artifact_path(session_dir, key)
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return path.read_text() if path.exists() else None
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def write_artifact(self, session_id: str, key: str, content: str) -> None:
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session_dir = self._session_dir(session_id)
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with self._lock(session_dir):
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self._require_existing(session_dir, session_id)
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self._write_private_text(self._artifact_path(session_dir, key), content)
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def append_decisions(
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self, session_id: str, decisions: Sequence[DecisionInput | dict]
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) -> list[DecisionRecord]:
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session_dir = self._session_dir(session_id)
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with self._lock(session_dir):
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self._require_existing(session_dir, session_id)
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# The legacy ledger helper remains the canonical record format. Its
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# separate lock also keeps direct workflow callers safe during Task 3.
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return append_decisions(session_dir, list(decisions))
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def get_preferences(self) -> dict:
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path = self.preferences_path
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if not path.exists():
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return {}
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data = json.loads(path.read_text())
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if not isinstance(data, dict):
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raise ValueError(f"Invalid preferences: {path}")
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return data
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def set_preferences(self, preferences: dict) -> None:
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if not isinstance(preferences, dict):
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raise TypeError("preferences must be a dictionary")
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path = self.preferences_path
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self._private_directory(path.parent)
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with portalocker.Lock(path.with_suffix(".lock"), mode="a+", timeout=10):
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self._write_private_text(path, json.dumps(preferences, ensure_ascii=False, sort_keys=True) + "\n")
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def delete(self, session_id: str) -> None:
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session_dir = self._session_dir(session_id)
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with self._lock(session_dir):
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self._require_existing(session_dir, session_id)
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shutil.rmtree(session_dir)
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def _session_dir(self, session_id: str) -> Path:
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self._require_uuid4(session_id)
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return self.root / session_id
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@staticmethod
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def _require_uuid4(session_id: str) -> None:
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try:
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parsed = uuid.UUID(session_id, version=4)
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except ValueError as exc:
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raise SessionError(f"ID sessione non UUIDv4: {session_id}") from exc
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if str(parsed) != session_id or parsed.version != 4:
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raise SessionError(f"ID sessione non UUIDv4: {session_id}")
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@staticmethod
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def _private_directory(path: Path) -> None:
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path.mkdir(parents=True, exist_ok=True)
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if os.name != "nt":
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path.chmod(0o700)
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def _lock(self, session_dir: Path):
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self._private_directory(session_dir)
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return portalocker.Lock(session_dir / ".repository.lock", mode="a+", timeout=10)
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@staticmethod
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def _require_existing(session_dir: Path, session_id: str) -> None:
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if not (session_dir / MANIFEST).exists():
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raise SessionError(f"Sessione non trovata: {session_id}")
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def _artifact_path(self, session_dir: Path, key: str) -> Path:
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if key in _ARTIFACT_FILES:
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return session_dir / _ARTIFACT_FILES[key]
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if key.startswith("cte_sql:"):
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name = key.removeprefix("cte_sql:")
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if _SAFE_CTE_NAME.fullmatch(name):
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return session_dir / "ctes" / f"{name}.sql"
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raise ValueError(f"Unsupported artifact key: {key}")
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def _read_artifacts(self, session_dir: Path) -> dict[str, str]:
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artifacts = {
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key: (session_dir / filename).read_text()
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for filename, key in _ARTIFACT_KEYS.items()
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if (session_dir / filename).is_file()
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}
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ctes = session_dir / "ctes"
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if ctes.is_dir():
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artifacts.update(
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{
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f"cte_sql:{path.stem}": path.read_text()
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for path in ctes.glob("*.sql")
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if _SAFE_CTE_NAME.fullmatch(path.stem)
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}
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)
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return artifacts
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def _write_manifest(self, session_dir: Path, manifest: SessionManifest) -> None:
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content = yaml.safe_dump(
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manifest.model_dump(by_alias=True, mode="json", exclude_defaults=False),
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sort_keys=False,
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allow_unicode=True,
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width=120,
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)
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self._write_private_text(session_dir / MANIFEST, content)
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def _write_private_text(self, path: Path, content: str) -> None:
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self._private_directory(path.parent)
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fd, temporary_name = tempfile.mkstemp(prefix=f".{path.name}.", dir=path.parent)
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temporary = Path(temporary_name)
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try:
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with os.fdopen(fd, "w") as handle:
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handle.write(content)
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handle.flush()
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os.fsync(handle.fileno())
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if os.name != "nt":
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temporary.chmod(0o600)
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os.replace(temporary, path)
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if os.name != "nt":
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path.chmod(0o600)
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finally:
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temporary.unlink(missing_ok=True)
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