@aurios/jason/src/layers/wal.ts

A simple, lightweight, and embeddable JSON document database built on Bun.

import { Path } from "@effect/platform";
import { Effect } from "effect";
import { makeWal } from "../make/wal.js";
import { ConfigManager } from "./config.js";
import { Json } from "./json.js";

export class WriteAheadLog extends Effect.Service<WriteAheadLog>()(
  "WriteAheadLog",
  {
    dependencies: [Json.Default],
    scoped: Effect.gen(function* () {
      const path = yield* Path.Path;
      const config = yield* ConfigManager;
      const db_path = yield* config.getBasePath;
      const wal_path = path.join(db_path, "_wal"); // database root
      const MAX_SEGMENT_SIZE = 1024 * 1024; // 1MB
      return yield* makeWal(wal_path, MAX_SEGMENT_SIZE);
    })
  }
) {}