wal-c

A Write-Ahead Log (WAL) written in C.

Concept

The WAL has an extremely simple design, it should be able to write arbitrary key-value pairs and replay the inserted values back.

Usage

A CLI tool is provided to act as an entrypoint to the WAL operations¹.

• wal-c write PATH_TO_FILE k=v,...: Write an arbitrary number of key-value pairs to the file as an insertion operation.
• wal-c delete PATH_TO_FILE k=v,...: Write an arbitrary number of key-value pairs to the file as a delete operation.
• wal-c [-s] replay PATH_TO_FILE: Replay the values written into the WAL directory. When -s is given, deletes will be shown.
• wal-c close PATH_TO_FILE: Closes a file, encoding metadata and marking it as immutable.

Footnotes

1. A WAL works much better for longer running operations than for a CLI, so this is really a glorified file read/writer. ↩