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fix(import): post-write read-back verification with durable ingest-log record (#2869)
A page write is not 'done' until it is readable back. After the import transaction commits, verify the page resolves via getPage and its content_hash matches what was just written. On mismatch or miss, fail LOUDLY instead of reporting success, and record the failure in ingest_log (best-effort) so it is durable and agent-inspectable rather than a transient stderr message. This catches the silent-desync class: the page file exists on disk (or the git commit landed) but the DB index never picked the write up — the operation previously reported success while the page stayed invisible to every read path (get_page, search, query) until someone noticed the gap manually. Guard applies to both importFromContent (markdown) and importCodeFile. Tests: new write-verify-guard suite (hermetic PGLite) covering the happy path, index-miss, stale-hash, ingest_log record, and the put_page operation surface; import-file.test.ts mock upgraded to simulate a readable DB (writes are read-backable), matching the new guard. PRJ-2026-032 Co-authored-by: merlin-drizzyenterprises[bot] <144527811+merlin-drizzyenterprises[bot]@users.noreply.github.com>
This commit is contained in:
Andre
co-authored by
merlin-drizzyenterprises[bot] <144527811+merlin-drizzyenterprises[bot]@users.noreply.github.com>
merlin-drizzyenterprises[bot] <144527811+merlin-drizzyenterprises[bot]@users.noreply.github.com>
parent
e0a208d7b7
commit
fa43907df4
@@ -899,6 +899,19 @@ export async function importFromContent(
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}
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}
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// Post-write read-back verification.
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//
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// After the transaction commits, the page MUST be resolvable via getPage.
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// If the read-back returns null (or a stale content_hash), the operation
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// fails LOUDLY — a non-zero exit + error surfaced to the ingest log — rather
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// than reporting success. A write is not "done" until it is readable.
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//
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// This catches the silent-desync class: the page file exists on disk (or the
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// git commit landed) but the DB index silently never picked it up. Without
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// this guard, the operation reports success and the page is invisible to all
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// reads (get_page, search, query) until someone notices the gap manually.
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await verifyPageReadable(engine, slug, hash, sourceId, 'importFromContent');
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return {
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slug,
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status: 'imported',
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@@ -909,6 +922,66 @@ export async function importFromContent(
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};
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}
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/**
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* Post-write read-back assertion.
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*
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* After a page write transaction commits, verify the page is resolvable via
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* `getPage` and that its `content_hash` matches the hash we just wrote. If the
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* read-back fails (page not found or stale hash), throw a loud error so the
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* caller surfaces the failure instead of reporting success.
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*
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* This is the write-then-verify guard on the sync/write path: a write is not
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* "done" until it is readable back.
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*/
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async function verifyPageReadable(
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engine: BrainEngine,
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slug: string,
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expectedHash: string,
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sourceId: string | undefined,
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caller: string,
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): Promise<void> {
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const readBack = await engine.getPage(slug, sourceId ? { sourceId } : undefined);
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if (!readBack) {
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// Log to ingest_log before throwing so the failure is durable and
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// agent-inspectable, not just a transient stderr message.
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try {
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await engine.logIngest({
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source_type: 'write-verify-guard',
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source_ref: slug,
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pages_updated: [],
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summary: `[${caller}] post-write read-back failed: page '${slug}' not found after write (source: ${sourceId ?? 'default'}). Silent desync — DB index did not pick up the write.`,
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...(sourceId ? { source_id: sourceId } : {}),
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});
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} catch {
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// Best-effort: don't mask the original failure if logIngest itself fails.
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}
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throw new Error(
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`[${caller}] post-write read-back failed: page '${slug}' not found after write ` +
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`(source: ${sourceId ?? 'default'}). The page was written but the DB index ` +
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`did not pick it up. This indicates a silent desync — the operation must fail loudly.`,
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);
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}
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if (readBack.content_hash !== expectedHash) {
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try {
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await engine.logIngest({
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source_type: 'write-verify-guard',
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source_ref: slug,
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pages_updated: [],
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summary: `[${caller}] post-write read-back failed: page '${slug}' has stale content_hash (expected ${expectedHash.slice(0, 12)}, got ${(readBack.content_hash ?? '').slice(0, 12)}; source: ${sourceId ?? 'default'}). Silent desync — DB index has a stale row.`,
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...(sourceId ? { source_id: sourceId } : {}),
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});
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} catch {
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// Best-effort.
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}
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throw new Error(
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`[${caller}] post-write read-back failed: page '${slug}' has stale content_hash ` +
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`(expected ${expectedHash.slice(0, 12)}, got ${(readBack.content_hash ?? '').slice(0, 12)}; ` +
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`source: ${sourceId ?? 'default'}). The page was written but the DB index ` +
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`has a stale row. This indicates a silent desync — the operation must fail loudly.`,
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);
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}
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}
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/**
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* Import from a file path. Validates size, reads content, delegates to importFromContent.
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*
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@@ -1202,6 +1275,11 @@ export async function importCodeFile(
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}
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});
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// Post-write read-back verification.
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// Same guard as the markdown path: a code page write is not "done" until
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// it is readable back via getPage.
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await verifyPageReadable(engine, slug, hash, sourceId, 'importCodeFile');
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// v0.20.0 Cathedral II Layer 5 (A1): extracted call-site edges persist
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// in code_edges_symbol (unresolved — we don't attempt within-file target
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// resolution here; getCallersOf / getCalleesOf match on to_symbol_qualified
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@@ -8,8 +8,18 @@ import { MARKDOWN_CHUNKER_VERSION } from '../src/core/chunkers/recursive.ts';
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const TMP = join(import.meta.dir, '.tmp-import-test');
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// Minimal mock engine that tracks calls and supports transaction()
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//
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// Post-write read-back guard: the mock now simulates a real DB by storing pages written
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// via putPage so getPage can read them back. The post-write read-back guard
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// in importFromContent calls getPage after the transaction commits — a mock
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// that always returns null (the pre-fix default) triggers the guard's
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// "page not found after write" path. This is the correct loud-failure
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// behavior for a real desync, but for the existing unit tests we need the
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// mock to behave like a working DB where writes are readable.
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function mockEngine(overrides: Partial<Record<string, any>> = {}): BrainEngine {
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const calls: { method: string; args: any[] }[] = [];
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// In-memory page store: slug → page row (simulates a real DB index).
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const pageStore = new Map<string, { slug: string; content_hash: string; title: string; type: string; frontmatter: Record<string, unknown> }>();
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const track = (method: string) => (...args: any[]) => {
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calls.push({ method, args });
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if (overrides[method]) return overrides[method](...args);
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@@ -20,7 +30,49 @@ function mockEngine(overrides: Partial<Record<string, any>> = {}): BrainEngine {
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get(_, prop: string) {
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if (prop === '_calls') return calls;
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if (prop === 'getTags') return overrides.getTags || (() => Promise.resolve([]));
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if (prop === 'getPage') return overrides.getPage || (() => Promise.resolve(null));
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if (prop === 'getPage') {
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return async (slug: string, opts?: { sourceId?: string }) => {
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// If the test provides a custom getPage, call it first (for the
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// "existing" check at the top of importFromContent). If it returns
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// a value, use that. If it returns null, fall back to the in-memory
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// store (for the read-back guard after the write).
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//
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// Read-back guard: when the override returns a non-null value,
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// we still need the read-back to see the page as written by putPage.
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// The override simulates the "existing page" state; the store has
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// the post-write state. If the override and the store disagree on
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// content_hash, the store wins (the write already committed).
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if (overrides.getPage) {
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const overrideResult = await overrides.getPage(slug, opts);
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if (overrideResult) {
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// If the page was written (store has it), the store's hash
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// is the post-write hash. Merge: return the override's shape
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// but with the store's content_hash (the committed value).
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const stored = pageStore.get(slug);
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if (stored) {
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return { ...overrideResult, content_hash: stored.content_hash };
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}
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return overrideResult;
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}
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}
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return pageStore.get(slug) ?? null;
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};
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}
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if (prop === 'putPage') {
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return async (slug: string, page: { content_hash?: string; title?: string; type?: string; frontmatter?: Record<string, unknown> }, _opts?: { sourceId?: string }) => {
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calls.push({ method: 'putPage', args: [slug, page, _opts] });
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if (overrides.putPage) overrides.putPage(slug, page, _opts);
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// Always store the page so getPage can read it back (simulates DB index).
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pageStore.set(slug, {
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slug,
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content_hash: page.content_hash ?? '',
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title: page.title ?? '',
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type: page.type ?? '',
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frontmatter: page.frontmatter ?? {},
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});
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return Promise.resolve(undefined);
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};
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}
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// transaction: just call the fn with the same engine (no real DB transaction in tests)
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if (prop === 'transaction') return async (fn: (tx: BrainEngine) => Promise<any>) => fn(engine);
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return track(prop);
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@@ -0,0 +1,249 @@
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/**
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* Post-write read-back verification tests.
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*
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* Reproduces the silent-desync case: a page write commits but the DB index
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* silently never picks it up. Without the guard, importFromContent reports
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* success. With the guard, it fails loudly (throws).
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*
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* Also verifies the happy path: a normal write passes read-back.
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*/
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import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, test } from 'bun:test';
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import * as fs from 'node:fs';
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import * as path from 'node:path';
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import * as os from 'node:os';
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import { PGLiteEngine } from '../src/core/pglite-engine.ts';
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import { resetPgliteState } from './helpers/reset-pglite.ts';
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import { resetGateway } from '../src/core/ai/gateway.ts';
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import { importFromContent } from '../src/core/import-file.ts';
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import { operations } from '../src/core/operations.ts';
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import type { OperationContext } from '../src/core/operations.ts';
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let engine: PGLiteEngine;
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let tmpRoot: string;
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let brainDir: string;
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beforeAll(async () => {
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engine = new PGLiteEngine();
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await engine.connect({});
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await engine.initSchema();
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});
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afterAll(async () => {
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await engine.disconnect();
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resetGateway();
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});
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beforeEach(async () => {
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await resetPgliteState(engine);
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resetGateway();
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tmpRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'gbrain-verify-'));
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brainDir = path.join(tmpRoot, 'brain');
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fs.mkdirSync(brainDir, { recursive: true });
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await engine.setConfig('sync.repo_path', brainDir);
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});
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afterEach(() => {
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fs.rmSync(tmpRoot, { recursive: true, force: true });
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});
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describe('post-write read-back verification', () => {
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test('normal write passes read-back and returns imported', async () => {
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const slug = 'inbox/verify-happy';
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const content = '---\ntitle: Happy\n---\n\n# Body that should round-trip cleanly';
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const result = await importFromContent(engine, slug, content, {
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noEmbed: true,
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sourceId: 'default',
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});
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expect(result.status).toBe('imported');
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expect(result.slug).toBe(slug);
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// The page is resolvable via getPage in the same operation.
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const page = await engine.getPage(slug, { sourceId: 'default' });
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expect(page).not.toBeNull();
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expect(page!.title).toBe('Happy');
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});
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test('silent desync (page on disk, absent from index) fails loudly', async () => {
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// Simulate the desync: write a page, then DELETE it from the DB
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// between the transaction and the read-back. In production, this
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// happens when the DB index silently fails to pick up the write
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// (e.g. a trigger dropped, a partition routing error, or an index
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// corruption). The guard must catch this and throw.
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//
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// We achieve this by wrapping the engine to intercept getPage
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// after the transaction and return null (simulating an index miss).
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const slug = 'inbox/verify-desync';
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const content = '---\ntitle: Desync\n---\n\n# Body that will be silently lost';
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// First, write the page normally to prove it works.
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const result1 = await importFromContent(engine, slug, content, {
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noEmbed: true,
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sourceId: 'default',
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});
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expect(result1.status).toBe('imported');
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// Now simulate the desync: delete the page from the DB, then
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// try to write it again. But this time, we intercept getPage
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// to return null after the write (simulating an index miss).
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//
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// We do this by monkey-patching the engine's getPage method
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// to return null for this specific slug on the NEXT call
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// (which is the read-back).
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await engine.executeRaw(`DELETE FROM pages WHERE slug = $1`, [slug]);
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// Verify the page is gone (simulating the index miss state).
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const gone = await engine.getPage(slug, { sourceId: 'default' });
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expect(gone).toBeNull();
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// Now write again, but intercept getPage to simulate the desync.
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// We need to intercept the read-back call specifically. Since
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// importFromContent calls getPage twice (once for existing check
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// at the top, once for read-back), we intercept the second call
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// for this specific slug.
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const slugCallCount = new Map<string, number>();
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const originalGetPage = engine.getPage.bind(engine);
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const interceptingGetPage = async (
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s: string,
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opts?: { sourceId?: string },
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) => {
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const count = (slugCallCount.get(s) ?? 0) + 1;
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slugCallCount.set(s, count);
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// The first getPage call is the "existing" check at the top of
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// importFromContent (line 561). The second is the read-back.
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// We let the first call through (returning null since we deleted
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// the page), but intercept the read-back to return null.
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if (s === slug && count === 2) {
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return null; // Simulate index miss on read-back.
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}
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return originalGetPage(s, opts);
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};
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engine.getPage = interceptingGetPage as typeof engine.getPage;
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try {
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// This should throw — the read-back fails, so the write is not "done".
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await expect(
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importFromContent(engine, slug, content, {
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noEmbed: true,
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sourceId: 'default',
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}),
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).rejects.toThrow(/post-write read-back failed/);
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} finally {
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// Restore the original getPage.
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engine.getPage = originalGetPage;
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}
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});
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test('stale content_hash fails loudly', async () => {
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// Simulate a stale hash: write a page, then corrupt the content_hash
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// before the read-back. The guard should detect the mismatch.
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const slug = 'inbox/verify-stale-hash';
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const content = '---\ntitle: Stale\n---\n\n# Body with stale hash';
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// Write the page normally first.
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await importFromContent(engine, slug, content, {
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noEmbed: true,
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sourceId: 'default',
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});
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// Corrupt the content_hash to simulate a stale row.
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await engine.executeRaw(
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`UPDATE pages SET content_hash = $1 WHERE slug = $2`,
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['stale-hash-value-that-does-not-match', slug],
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);
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// Now try to write again. The existing check will find the page
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// (with the stale hash), so it won't be skipped. The write will
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// commit, but the read-back should detect the stale hash...
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// except wait — the write will UPDATE the hash, so the read-back
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// will see the NEW hash. We need to intercept getPage to return
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// the stale hash instead.
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const slugCallCount = new Map<string, number>();
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const originalGetPage = engine.getPage.bind(engine);
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const stalePage = await originalGetPage(slug, { sourceId: 'default' });
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// Write the stale hash back so the existing check sees a mismatch.
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await engine.executeRaw(
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`UPDATE pages SET content_hash = $1 WHERE slug = $2`,
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['stale-hash-value-that-does-not-match', slug],
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);
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const interceptingGetPage = async (
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s: string,
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opts?: { sourceId?: string },
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) => {
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const count = (slugCallCount.get(s) ?? 0) + 1;
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slugCallCount.set(s, count);
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// The read-back call (second getPage for this slug) returns the
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// stale page with the old hash.
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if (s === slug && count === 2 && stalePage) {
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return { ...stalePage, content_hash: 'stale-hash-value-that-does-not-match' };
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}
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return originalGetPage(s, opts);
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};
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engine.getPage = interceptingGetPage as typeof engine.getPage;
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try {
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await expect(
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importFromContent(engine, slug, content, {
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noEmbed: true,
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sourceId: 'default',
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}),
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).rejects.toThrow(/stale content_hash/);
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} finally {
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engine.getPage = originalGetPage;
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}
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});
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test('put_page operation surfaces read-back failure to the caller', async () => {
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// Verify that the put_page MCP operation also surfaces the read-back
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// failure (not just importFromContent directly). This is the path
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// agents actually call.
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const putPage = operations.find((o) => o.name === 'put_page')!;
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const slug = 'inbox/verify-putpage-desync';
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const content = '---\ntitle: Desync\n---\n\n# Body that will be silently lost';
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// Intercept getPage to simulate index miss on the read-back.
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// Use a slug-specific counter to avoid interference from other tests
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// that might call getPage on the same engine.
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//
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// The put_page handler calls getPage via importFromContent, which makes
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// two getPage calls for this slug:
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// 1. importFromContent's existing-page check
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// 2. verifyPageReadable's read-back (the one we intercept)
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const slugCallCount = new Map<string, number>();
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const originalGetPage = engine.getPage.bind(engine);
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const interceptingGetPage = async (
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s: string,
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opts?: { sourceId?: string },
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) => {
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const count = (slugCallCount.get(s) ?? 0) + 1;
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slugCallCount.set(s, count);
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// Intercept the read-back call (callCount == 2 for this slug).
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if (s === slug && count === 2) {
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return null;
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}
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||||
return originalGetPage(s, opts);
|
||||
};
|
||||
engine.getPage = interceptingGetPage as typeof engine.getPage;
|
||||
|
||||
const ctx: OperationContext = {
|
||||
engine,
|
||||
config: { engine: 'pglite' as const },
|
||||
logger: { info: () => {}, warn: () => {}, error: () => {} },
|
||||
dryRun: false,
|
||||
remote: false,
|
||||
sourceId: 'default',
|
||||
agentIdentity: { name: 'Test Agent', email: 'test-agent@example.com' },
|
||||
} as OperationContext;
|
||||
|
||||
try {
|
||||
await expect(
|
||||
putPage.handler(ctx, { slug, content }),
|
||||
).rejects.toThrow(/post-write read-back failed/);
|
||||
} finally {
|
||||
engine.getPage = originalGetPage;
|
||||
}
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user