glyff-file-store 0.3.0

File-based SessionStore implementation for glyff.

glyff-file-store

A file-based SessionStore implementation for glyff.

Sessions are persisted to disk as a JSON event log. The whole log is loaded into memory at startup and the file is rewritten atomically on each commit; suitable for sessions where the log fits comfortably in memory. For very large or high-throughput sessions, prefer a database-backed store.

Install

pip install glyff-file-store

This package depends on glyff>=0.1.0.

Public API

Name	Description
FileClient	Low-level file I/O for a session directory.
JsonFileSessionStore	SessionStore writing a pretty-printed JSON event log file.

Format

Each session lives under <base_dir>/<session_id>/ and stores its event log in a single pretty-printed JSON file (executions.json). The whole log is read into memory on startup and rewritten atomically on every commit.

Commit atomicity

FileClient commits the staged ops for an entire session directory as a unit. Each commit builds the full new session state in a sibling .commit-* directory and then swaps it into place via two renames (session → session.bak, tmp → session, drop session.bak). All staged ops are visible together or none are, regardless of how many files were touched, and a writer callback raising mid-commit leaves the on-disk session unchanged.

If a process dies mid-commit, the next FileClient(...) instantiation restores the session from session.bak (when the live directory is missing) or drops the stale backup (when the live directory is already in place), and removes any orphan .commit-* temp directories.

Status

Early development. APIs may change before v1.0.

License

MIT