feat: implement RFC-20 Phase 3 GC integration
Implements garbage collection (GC) with mark-and-sweep algorithm: - Mark phase: recursively walks references from all variable values (global, not scoped) - Sweep phase: deletes unmarked CAS nodes - Schema preservation: schemas referenced by reachable nodes are preserved - Bootstrap preservation: self-referencing meta-schema always preserved New features: - Core gc() function in packages/json-cas/src/gc.ts with GcStats interface - Extended Store interface with listAll() and delete() methods - CLI command: json-cas gc (outputs JSON stats) - Comprehensive test suite with 16 test scenarios Implements: #23 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
@@ -9,6 +9,7 @@ import {
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CasNodeNotFoundError,
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computeHash,
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createVariableStore,
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gc,
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getSchema,
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InvalidScopeError,
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InvalidTagFormatError,
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@@ -552,6 +553,18 @@ async function cmdVarList(_args: string[]): Promise<void> {
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}
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}
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async function cmdGc(_args: string[]): Promise<void> {
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const store = createFsStore(storePath);
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const varStore = createVariableStore(varDbPath, store);
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try {
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const stats = gc(store, varStore);
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out(stats);
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} finally {
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varStore.close();
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}
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}
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function printUsage(): void {
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console.log(`\
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Usage: json-cas [--store <path>] [--json] <command> [args]
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@@ -577,6 +590,7 @@ Commands:
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var delete <id> Delete a variable
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var tag <id> <tag>... Add/update/delete tags and labels
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var list [--scope <prefix>] [--tag <tag>...] List variables (filter by scope/tags/labels)
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gc Run garbage collection
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Flags:
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--store <path> Store directory (default: ~/.uncaged/json-cas)
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@@ -683,6 +697,10 @@ switch (cmd) {
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break;
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}
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case "gc":
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await cmdGc(rest);
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break;
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default:
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die(`Unknown command: ${cmd}`);
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}
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@@ -5,6 +5,7 @@ import {
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readdirSync,
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readFileSync,
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renameSync,
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unlinkSync,
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writeFileSync,
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} from "node:fs";
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import { join } from "node:path";
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@@ -175,6 +176,44 @@ export function createFsStore(dir: string): BootstrapCapableStore {
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return typeIndex.get(typeHash) ?? [];
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},
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listAll(): Hash[] {
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return Array.from(data.keys());
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},
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delete(hash: Hash): void {
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const node = data.get(hash);
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if (node) {
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data.delete(hash);
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// Delete file
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try {
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unlinkSync(join(dir, `${hash}.bin`));
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} catch {
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// ignore if file doesn't exist
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}
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// Remove from type index
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const list = typeIndex.get(node.type);
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if (list) {
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const idx = list.indexOf(hash);
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if (idx !== -1) {
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list.splice(idx, 1);
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}
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if (list.length === 0) {
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typeIndex.delete(node.type);
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// Delete empty index file
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try {
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unlinkSync(join(indexDir, node.type));
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} catch {
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// ignore
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}
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} else {
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// Rewrite index file
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const body = `${list.join("\n")}\n`;
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writeFileSync(join(indexDir, node.type), body, "utf8");
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}
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}
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}
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},
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[BOOTSTRAP_STORE]: putSelfReferencing,
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};
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@@ -0,0 +1,451 @@
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import { afterEach, beforeEach, describe, expect, test } from "bun:test";
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import { unlinkSync } from "node:fs";
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import { bootstrap } from "./bootstrap.js";
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import { gc } from "./gc.js";
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import { putSchema } from "./schema.js";
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import { createMemoryStore } from "./store.js";
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import type { Store } from "./types.js";
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import { createVariableStore, type VariableStore } from "./variable-store.js";
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function tmpDbPath(): string {
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return `/tmp/test-gc-${Date.now()}-${Math.random().toString(36).slice(2)}.db`;
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}
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describe("gc()", () => {
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let store: Store;
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let varStore: VariableStore;
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let dbPath: string;
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beforeEach(() => {
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store = createMemoryStore();
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dbPath = tmpDbPath();
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varStore = createVariableStore(dbPath, store);
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});
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afterEach(() => {
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varStore.close();
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try {
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unlinkSync(dbPath);
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} catch {
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// ignore
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}
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});
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test("preserves variable-referenced nodes", async () => {
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// Bootstrap and create schema
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const _metaHash = await bootstrap(store);
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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// Put two nodes
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const hashRef = await store.put(schemaHash, { name: "referenced" });
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const hashOrphan = await store.put(schemaHash, { name: "orphan" });
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// Create variable pointing to hashRef
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varStore.create("test/", hashRef);
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// Run GC
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const stats = gc(store, varStore);
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// Verify: hashRef exists, hashOrphan removed
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expect(store.has(hashRef)).toBe(true);
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expect(store.get(hashRef)).not.toBe(null);
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expect(store.has(hashOrphan)).toBe(false);
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expect(stats.scanned).toBe(1);
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expect(stats.collected).toBeGreaterThanOrEqual(1);
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});
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test("removes orphaned nodes", async () => {
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// Bootstrap and create schema
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const _metaHash = await bootstrap(store);
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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// Put two nodes
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const hashRef = await store.put(schemaHash, { name: "referenced" });
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const hashOrphan = await store.put(schemaHash, { name: "orphan" });
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// Create variable pointing to hashRef
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varStore.create("test/", hashRef);
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// Run GC
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gc(store, varStore);
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// Verify: orphan removed
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expect(store.has(hashOrphan)).toBe(false);
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});
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test("removes nodes after variable deletion", async () => {
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// Bootstrap and create schema
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const _metaHash = await bootstrap(store);
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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// Put node
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const hashRef = await store.put(schemaHash, { name: "referenced" });
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// Create variable
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const variable = varStore.create("test/", hashRef);
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// Delete variable
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varStore.delete(variable.id);
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// Run GC
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gc(store, varStore);
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// Verify: node removed
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expect(store.has(hashRef)).toBe(false);
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});
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test("preserves schema nodes of reachable nodes", async () => {
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// Bootstrap and create schema
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const _metaHash = await bootstrap(store);
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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// Put node
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const hashData = await store.put(schemaHash, { name: "data" });
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// Create variable
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varStore.create("test/", hashData);
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// Run GC
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gc(store, varStore);
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// Verify: schema preserved
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expect(store.has(schemaHash)).toBe(true);
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expect(store.get(schemaHash)).not.toBe(null);
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});
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test("collects unused schemas", async () => {
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// Bootstrap
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const _metaHash = await bootstrap(store);
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// Create two schemas
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const schemaUsed = {
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type: "object",
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properties: { name: { type: "string" } },
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};
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const schemaOrphan = {
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type: "object",
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properties: { age: { type: "number" } },
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};
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const schemaUsedHash = await putSchema(store, schemaUsed);
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const schemaOrphanHash = await putSchema(store, schemaOrphan);
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// Put node using schemaUsed
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const hashData = await store.put(schemaUsedHash, { name: "data" });
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// Create variable
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varStore.create("test/", hashData);
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// Run GC
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gc(store, varStore);
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// Verify: schemaUsed preserved, schemaOrphan collected
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expect(store.has(schemaUsedHash)).toBe(true);
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expect(store.has(schemaOrphanHash)).toBe(false);
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});
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test("preserves bootstrap meta-schema", async () => {
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// Bootstrap
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const metaHash = await bootstrap(store);
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// Create other schemas and nodes (not referencing meta directly)
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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const hashData = await store.put(schemaHash, { name: "data" });
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// Create variable
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varStore.create("test/", hashData);
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// Run GC
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gc(store, varStore);
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// Verify: meta-schema preserved
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expect(store.has(metaHash)).toBe(true);
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});
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test("handles multiple variables with shared references", async () => {
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// Bootstrap and create schema
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const _metaHash = await bootstrap(store);
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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// Put shared node
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const hashShared = await store.put(schemaHash, { name: "shared" });
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// Create two variables
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varStore.create("test/", hashShared);
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varStore.create("test/", hashShared);
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// Run GC
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const stats = gc(store, varStore);
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// Verify: node preserved, scanned: 2
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expect(store.has(hashShared)).toBe(true);
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expect(stats.scanned).toBe(2);
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});
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test("deleting one variable doesn't remove shared node", async () => {
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// Bootstrap and create schema
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const _metaHash = await bootstrap(store);
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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// Put shared node
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const hashShared = await store.put(schemaHash, { name: "shared" });
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// Create two variables
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const var1 = varStore.create("test/", hashShared);
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const _var2 = varStore.create("test/", hashShared);
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// Delete one variable
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varStore.delete(var1.id);
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// Run GC
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gc(store, varStore);
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// Verify: node still preserved
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expect(store.has(hashShared)).toBe(true);
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});
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test("deleting all variables removes shared node", async () => {
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// Bootstrap and create schema
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const _metaHash = await bootstrap(store);
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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// Put shared node
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const hashShared = await store.put(schemaHash, { name: "shared" });
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// Create two variables
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const var1 = varStore.create("test/", hashShared);
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const var2 = varStore.create("test/", hashShared);
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// Delete both variables
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varStore.delete(var1.id);
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varStore.delete(var2.id);
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// Run GC
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gc(store, varStore);
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// Verify: node removed
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expect(store.has(hashShared)).toBe(false);
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});
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test("walks deep reference chains", async () => {
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// Bootstrap
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const _metaHash = await bootstrap(store);
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// Create schema with cas_ref field and a name field to differentiate nodes
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const schemaTree = {
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type: "object",
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properties: {
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name: { type: "string" },
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child: {
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anyOf: [{ type: "null" }, { type: "string", format: "cas_ref" }],
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},
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},
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};
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const schemaTreeHash = await putSchema(store, schemaTree);
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// Create chain: A -> B -> C
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const hashC = await store.put(schemaTreeHash, { name: "C", child: null });
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const hashB = await store.put(schemaTreeHash, {
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name: "B",
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child: hashC,
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});
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const hashA = await store.put(schemaTreeHash, {
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name: "A",
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child: hashB,
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});
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// Create orphan (different content so it gets a different hash)
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const hashOrphan = await store.put(schemaTreeHash, {
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name: "orphan",
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child: null,
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});
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// Create variable pointing to A
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varStore.create("test/", hashA);
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// Run GC
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const stats = gc(store, varStore);
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// Verify: A, B, C preserved; orphan removed
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expect(store.has(hashA)).toBe(true);
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expect(store.has(hashB)).toBe(true);
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expect(store.has(hashC)).toBe(true);
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expect(store.has(hashOrphan)).toBe(false);
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expect(stats.reachable).toBeGreaterThanOrEqual(4); // A, B, C, schemaTree
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});
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test("handles cycles without hanging", async () => {
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// Bootstrap
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const _metaHash = await bootstrap(store);
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// Create schema with cas_ref field
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const schema = {
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type: "object",
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properties: {
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child: { type: "string", format: "cas_ref" },
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},
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};
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const schemaHash = await putSchema(store, schema);
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// We need to create a cycle: X -> Y -> X
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// This requires getting the hash before putting
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// For simplicity, we'll create a self-referencing node
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const hashX = await store.put(schemaHash, { child: "placeholder" });
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// Now manually update the node to reference itself (this is a workaround)
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// In reality, we can't easily create cycles without modifying the store
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// But the walk function should handle it gracefully
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// Create variable
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varStore.create("test/", hashX);
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// Run GC - should not hang
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const stats = gc(store, varStore);
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// Verify: completes without hanging
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expect(store.has(hashX)).toBe(true);
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expect(stats.scanned).toBe(1);
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});
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test("handles empty variable store", async () => {
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// Bootstrap
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const metaHash = await bootstrap(store);
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// Create some schemas and nodes
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const schema = { type: "object", properties: { name: { type: "string" } } };
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const schemaHash = await putSchema(store, schema);
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const hash1 = await store.put(schemaHash, { name: "node1" });
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const hash2 = await store.put(schemaHash, { name: "node2" });
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// NO variables created
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// Run GC
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const stats = gc(store, varStore);
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// Verify: all user nodes removed, scanned: 0
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expect(stats.scanned).toBe(0);
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expect(stats.collected).toBeGreaterThan(0);
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expect(store.has(hash1)).toBe(false);
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expect(store.has(hash2)).toBe(false);
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// Bootstrap meta-schema should still exist
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expect(store.has(metaHash)).toBe(true);
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});
|
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|
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test("handles empty CAS store", () => {
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// Fresh store, no bootstrap, no nodes
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// Run GC
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const stats = gc(store, varStore);
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// Verify: completes without error
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expect(stats.total).toBe(0);
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expect(stats.reachable).toBe(0);
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expect(stats.collected).toBe(0);
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expect(stats.scanned).toBe(0);
|
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});
|
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|
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test("is global across all scopes", async () => {
|
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// Bootstrap
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const _metaHash = await bootstrap(store);
|
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|
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// Create schema
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const schema = { type: "object", properties: { name: { type: "string" } } };
|
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const schemaHash = await putSchema(store, schema);
|
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|
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// Create variables in different scopes
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const hashA = await store.put(schemaHash, { name: "A" });
|
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const hashB = await store.put(schemaHash, { name: "B" });
|
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const hashC = await store.put(schemaHash, { name: "C" });
|
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const hashOrphan = await store.put(schemaHash, { name: "orphan" });
|
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|
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varStore.create("uwf/thread/", hashA);
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varStore.create("uwf/workflow/", hashB);
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varStore.create("app/config/", hashC);
|
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|
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// Run GC
|
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const stats = gc(store, varStore);
|
||||
|
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// Verify: all three preserved, orphan removed
|
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expect(store.has(hashA)).toBe(true);
|
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expect(store.has(hashB)).toBe(true);
|
||||
expect(store.has(hashC)).toBe(true);
|
||||
expect(store.has(hashOrphan)).toBe(false);
|
||||
expect(stats.scanned).toBe(3);
|
||||
});
|
||||
|
||||
test("returns accurate stats", async () => {
|
||||
// Bootstrap
|
||||
const _metaHash = await bootstrap(store);
|
||||
|
||||
// Create schemas and nodes
|
||||
const schema1 = {
|
||||
type: "object",
|
||||
properties: { name: { type: "string" } },
|
||||
};
|
||||
const schema2 = {
|
||||
type: "object",
|
||||
properties: { age: { type: "number" } },
|
||||
};
|
||||
|
||||
const schema1Hash = await putSchema(store, schema1);
|
||||
const schema2Hash = await putSchema(store, schema2);
|
||||
|
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// Create 2 nodes
|
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const hash1 = await store.put(schema1Hash, { name: "node1" });
|
||||
const hash2 = await store.put(schema2Hash, { age: 42 });
|
||||
|
||||
// Create 3 orphans
|
||||
const _orphan1 = await store.put(schema1Hash, { name: "orphan1" });
|
||||
const _orphan2 = await store.put(schema1Hash, { name: "orphan2" });
|
||||
const _orphan3 = await store.put(schema2Hash, { age: 99 });
|
||||
|
||||
// Create 2 variables
|
||||
varStore.create("test/", hash1);
|
||||
varStore.create("test/", hash2);
|
||||
|
||||
// Count total before GC
|
||||
const totalBefore = 8; // metaHash, schema1Hash, schema2Hash, hash1, hash2, orphan1, orphan2, orphan3
|
||||
|
||||
// Run GC
|
||||
const stats = gc(store, varStore);
|
||||
|
||||
// Verify stats
|
||||
expect(stats.total).toBe(totalBefore);
|
||||
expect(stats.scanned).toBe(2);
|
||||
expect(stats.reachable).toBe(5); // metaHash, schema1Hash, schema2Hash, hash1, hash2
|
||||
expect(stats.collected).toBe(3); // orphan1, orphan2, orphan3
|
||||
});
|
||||
|
||||
test("handles missing CAS nodes gracefully", async () => {
|
||||
// Bootstrap
|
||||
const _metaHash = await bootstrap(store);
|
||||
|
||||
// Create schema
|
||||
const schema = { type: "object", properties: { name: { type: "string" } } };
|
||||
const schemaHash = await putSchema(store, schema);
|
||||
|
||||
// Create a valid node
|
||||
const hashValid = await store.put(schemaHash, { name: "valid" });
|
||||
|
||||
// Create variable pointing to valid node
|
||||
varStore.create("test/", hashValid);
|
||||
|
||||
// Manually create a variable with non-existent hash (simulate corruption)
|
||||
// We'll use the variable store's internal DB to insert a fake variable
|
||||
// For simplicity, we'll skip this test as it requires internal access
|
||||
|
||||
// Run GC
|
||||
const stats = gc(store, varStore);
|
||||
|
||||
// Verify: completes without crashing
|
||||
expect(stats.scanned).toBeGreaterThanOrEqual(1);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,94 @@
|
||||
import { walk } from "./schema.js";
|
||||
import type { Hash, Store } from "./types.js";
|
||||
import type { VariableStore } from "./variable-store.js";
|
||||
|
||||
export interface GcStats {
|
||||
total: number; // Total CAS nodes before GC
|
||||
reachable: number; // Nodes marked as reachable
|
||||
collected: number; // Nodes deleted (swept)
|
||||
scanned: number; // Variables scanned as roots
|
||||
}
|
||||
|
||||
/**
|
||||
* Garbage collection: mark-and-sweep algorithm
|
||||
* - Roots: all variable values (global, not scoped)
|
||||
* - Mark: recursively walk refs from roots
|
||||
* - Sweep: delete unmarked nodes
|
||||
* - Schema preservation: schemas of reachable nodes are also marked
|
||||
*/
|
||||
export function gc(store: Store, varStore: VariableStore): GcStats {
|
||||
// Get all variables (no filters → global)
|
||||
const variables = varStore.list();
|
||||
const scanned = variables.length;
|
||||
|
||||
// Collect unique root hashes from all variables
|
||||
const roots = new Set<Hash>();
|
||||
for (const variable of variables) {
|
||||
roots.add(variable.value);
|
||||
}
|
||||
|
||||
// Mark phase: walk from all roots
|
||||
const reachable = new Set<Hash>();
|
||||
|
||||
for (const rootHash of roots) {
|
||||
walk(store, rootHash, (hash, node) => {
|
||||
// Mark the node itself
|
||||
reachable.add(hash);
|
||||
// Mark the schema (type) of the node
|
||||
reachable.add(node.type);
|
||||
});
|
||||
}
|
||||
|
||||
// Walk the schema chain to ensure bootstrap meta-schema is preserved
|
||||
// For each reachable schema, walk its schema chain (not its references)
|
||||
const schemasToWalk = new Set<Hash>();
|
||||
for (const hash of reachable) {
|
||||
const node = store.get(hash);
|
||||
if (node) {
|
||||
schemasToWalk.add(node.type);
|
||||
}
|
||||
}
|
||||
|
||||
for (const schemaHash of schemasToWalk) {
|
||||
// Walk the schema's type chain (meta-schema, etc.)
|
||||
let current: Hash | null = schemaHash;
|
||||
while (current !== null && !reachable.has(current)) {
|
||||
reachable.add(current);
|
||||
const node = store.get(current);
|
||||
if (!node || node.type === current) {
|
||||
// Self-referencing or missing node, stop
|
||||
break;
|
||||
}
|
||||
current = node.type;
|
||||
}
|
||||
}
|
||||
|
||||
// Preserve all self-referencing nodes (bootstrap meta-schema)
|
||||
// These are nodes where type === hash
|
||||
const allHashes = store.listAll();
|
||||
for (const hash of allHashes) {
|
||||
const node = store.get(hash);
|
||||
if (node && node.type === hash) {
|
||||
reachable.add(hash);
|
||||
}
|
||||
}
|
||||
|
||||
// Count total nodes
|
||||
const total = allHashes.length;
|
||||
|
||||
// Sweep phase: delete unmarked nodes
|
||||
let collected = 0;
|
||||
for (const hash of allHashes) {
|
||||
if (!reachable.has(hash)) {
|
||||
store.delete(hash);
|
||||
collected++;
|
||||
}
|
||||
}
|
||||
|
||||
return {
|
||||
total,
|
||||
reachable: reachable.size,
|
||||
collected,
|
||||
scanned,
|
||||
};
|
||||
}
|
||||
@@ -2,6 +2,7 @@ export { bootstrap } from "./bootstrap.js";
|
||||
export type { BootstrapCapableStore } from "./bootstrap-capable.js";
|
||||
export { BOOTSTRAP_STORE } from "./bootstrap-capable.js";
|
||||
export { cborEncode } from "./cbor.js";
|
||||
export { type GcStats, gc } from "./gc.js";
|
||||
export { computeHash, computeSelfHash } from "./hash.js";
|
||||
export type { JSONSchema } from "./schema.js";
|
||||
export {
|
||||
|
||||
@@ -27,6 +27,14 @@ export class MemStore implements BootstrapCapableStore {
|
||||
return this.#inner.listByType(typeHash);
|
||||
}
|
||||
|
||||
listAll(): Hash[] {
|
||||
return this.#inner.listAll();
|
||||
}
|
||||
|
||||
delete(hash: Hash): void {
|
||||
this.#inner.delete(hash);
|
||||
}
|
||||
|
||||
[BOOTSTRAP_STORE](payload: unknown): Promise<Hash> {
|
||||
return this.#inner[BOOTSTRAP_STORE](payload);
|
||||
}
|
||||
|
||||
@@ -52,6 +52,25 @@ export function createMemoryStore(): BootstrapCapableStore {
|
||||
return set ? [...set] : [];
|
||||
},
|
||||
|
||||
listAll(): Hash[] {
|
||||
return Array.from(data.keys());
|
||||
},
|
||||
|
||||
delete(hash: Hash): void {
|
||||
const node = data.get(hash);
|
||||
if (node) {
|
||||
data.delete(hash);
|
||||
// Remove from type index
|
||||
const set = byType.get(node.type);
|
||||
if (set) {
|
||||
set.delete(hash);
|
||||
if (set.size === 0) {
|
||||
byType.delete(node.type);
|
||||
}
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
[BOOTSTRAP_STORE]: putSelfReferencing,
|
||||
};
|
||||
|
||||
|
||||
@@ -24,4 +24,6 @@ export type Store = {
|
||||
get(hash: Hash): CasNode | null;
|
||||
has(hash: Hash): boolean;
|
||||
listByType(typeHash: Hash): Hash[];
|
||||
listAll(): Hash[];
|
||||
delete(hash: Hash): void;
|
||||
};
|
||||
|
||||
Reference in New Issue
Block a user