refactor(client): dé-poller resolveAccountReliably — barrière au lieu de retry
Le polling est un anti-pattern NextGraph (par abonnement). La résolution de compte retentait ×8 la lecture du shim tant qu'elle rendait 0 (lag de sync) — c'est du polling. Remplacé par la BARRIÈRE d'abonnement, déjà le mécanisme de open-repo : - `resolveAccountReliably` : `await ensureRepoOpen(did🆖${privateStoreId})` (subscribe + attendre le 1er State — le shim vit dans le graphe du private store), PUIS lecture UNIQUE. Après la barrière, 0 ligne = compte réellement inexistant → provision 1×, lignes présentes = réutilisé (garantie NO-FORK préservée). Plus de boucle de re-lecture. - timed-out (barrière expirée) : throw explicite, NE provisionne PAS (un provision sur sync incomplète re-forkerait). Le « trop long » est un signal, pas un feu vert. - fake ng sans doc_subscribe : ensureRepoOpen no-op → lecture immédiate (unit intact). - `_forceOpenedSyncState` : helper test-only (underscore, non ré-exporté). anti-fork.test.ts réécrit (5 tests : no-fork, neuf→1 provision, idempotence, fake no-op, timed-out→throw) ; plus aucun test de comptage de retry. gate : tsc propre ; bun test 117. e2e À RE-VALIDER quand le broker répond (dégradé ce jour : crash Chromium post-connexion) — la barrière ensureRepoOpen est déjà validée e2e (CONTRAT 3 + reconnexion) en broker sain. provisionRetry devient un champ mort de StoreRegistryDeps (nettoyage ultérieur). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -110,6 +110,17 @@ export function resetOpenedRepos(): void {
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boundSessionId = null;
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}
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/**
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* @internal TEST-ONLY — force a nuri into the opened registry with a given sync
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* state, without going through `doc_subscribe`. Used by `anti-fork.test.ts` to
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* simulate a timed-out barrier without waiting the full `OPEN_TIMEOUT_MS` (8s).
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* Do NOT call from production code.
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*/
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export function _forceOpenedSyncState(nuri: Nuri, state: SyncState): void {
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opened.add(nuri);
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syncState.set(nuri, state);
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}
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/**
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* The bootstrap sync state of `nuri` (lib-internal accessor; NOT a reactive
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* app-facing hook — that is a later phase). Returns `"unknown"` if the repo was
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@@ -36,27 +36,30 @@ import { docCreate, sparqlUpdate, sparqlQuery } from "./docs";
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import { getStoreRegistryDeps } from "./polyfill";
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import { ensureRepoOpen } from "./open-repo";
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// --- provisioning anti-fork retry budget (polyfill-era) --------------------
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// --- provisioning anti-fork guard: barrier-first (polyfill-era) ------------
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//
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// The shim (account→docs trust root) lives in the shared wallet's PRIVATE store.
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// On a fresh session over a persistent wallet, that store's repo may not have
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// synced yet from the broker: a targeted account resolve then reads 0 rows even
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// though the account WAS persisted in an earlier session. If ensureAccount took
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// that 0 at face value it would RE-PROVISION a second set of scope documents —
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// an account FORK: one session writes/reads one set, another (or the same after
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// a cache drop) the other, EMPTY set → the user "loses" their data on reconnect.
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// On a fresh session over a persistent wallet, that repo may not have synced yet
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// from the broker: a targeted account resolve would then read 0 rows even though
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// the account WAS persisted in an earlier session. If ensureAccount took that 0
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// at face value it would RE-PROVISION a second set of scope documents — an account
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// FORK: one session writes/reads one set, another (or the same after a cache drop)
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// the other, EMPTY set → the user "loses" their data on reconnect.
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//
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// Guard: before deciding an account is genuinely new, re-read it with a BOUNDED
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// backoff (open + await the anchor repo, then retry the targeted query). Only if
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// EVERY attempt within the budget still reads 0 do we treat it as a first-time
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// account and provision. A pre-existing account merely lagging by sync is thus
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// found on a later attempt and REUSES its docs (no fork); a truly new account
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// exhausts the budget cheaply and is provisioned exactly once. The budget is a
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// hard ceiling — never an unbounded poll — and is INJECTED (StoreRegistryDeps.
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// provisionRetry): production defaults to ~8 attempts / ≲8.5s; a synchronous
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// in-memory store (unit fake `ng`) passes `attempts: 1` to skip it (a 0-row read
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// is authoritative there — no lag to wait out). Disappears at the real
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// multi-store migration (deterministic per-user store NURIs make this moot).
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// Guard (barrier-first): BEFORE reading the shim, open/subscribe the private-store
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// repo and AWAIT its first `State` push — the deterministic sync barrier (CONTRACT 3
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// in e2e/). After the barrier, presence is GUARANTEED and absence DEFINITIVE. Then
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// read the shim ONCE: 0 rows = account genuinely absent → provision exactly once;
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// rows present = account found → reuse it (NO-FORK). No retry loop, no poll.
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//
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// Timed-out barrier (conservative): if `ensureRepoOpen` exits via the 8-second
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// fallback timeout (getSyncState → "timed-out") the sync is UNCONFIRMED — we do NOT
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// provision blindly (that would re-fork). Instead we surface a clear error so the
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// caller can retry the full flow rather than silently creating a duplicate account.
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// The timeout is rare (pathological broker) and a hard error there is far safer than
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// a silent fork. Disappears at the real multi-store migration (per-user store NURIs
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// make this moot — barrier becomes the native store-open which is always confirmed).
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import { getSyncState } from "./open-repo";
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import { escapeLiteral, escapeIri, assertNuri } from "./sparql";
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import type { Nuri, Scope } from "./types";
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@@ -280,48 +283,51 @@ export async function resolveAccount(id: string): Promise<AccountRecord | null>
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}
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/**
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* Resolve ONE account, retrying a BOUNDED number of times before giving up, to
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* distinguish a genuinely-absent account from one whose shim record has simply
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* not synced yet on a fresh session (the account-FORK guard — see the
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* PROVISION_RETRY_* budget note at the top of this module).
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* Resolve ONE account after waiting for the private-store sync barrier, so a
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* 0-row result is DEFINITIVE (account genuinely absent) rather than ambiguous
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* (broker lag). This is the ANTI-FORK guard for the polyfill-era shim.
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*
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* On the FIRST miss it opens/subscribes the shim anchor repo (the shared
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* wallet's private store, where the shim lives) so the broker pushes its state,
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* then re-reads with capped exponential backoff. Returns the record as soon as
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* any attempt finds it (populating `accountCache` via resolveAccount), or `null`
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* if the whole budget is exhausted with 0 rows — the only case in which the
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* caller may treat the account as new and provision it.
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* Flow:
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* 1. Cache hit → return immediately (session-idempotent, no I/O).
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* 2. Open/subscribe the private-store repo (`did:ng:${privateStoreId}`) and
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* await the first `State` push — the deterministic sync barrier (CONTRACT 3).
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* After the barrier, presence is guaranteed and absence definitive.
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* 3. If the barrier TIMED-OUT (getSyncState → "timed-out"), the sync is
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* unconfirmed — provisioning here would risk a fork. Throw a clear error
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* instead so the caller can retry the full login flow. This is the
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* conservative-safe choice: a hard error is recoverable; a silent fork is not.
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* 4. Read the shim ONCE. 0 rows = genuinely absent → caller provisions exactly
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* once. Rows present → reuse (NO-FORK preserved).
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*
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* No-op fast path: a cache hit returns immediately with no retries. With the
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* unit fake `ng` (no doc_subscribe, synchronous store) a present account is
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* found on attempt 0 and an absent one exhausts the (short-sleep) budget without
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* changing behaviour — the fork can only arise against a real, lagging broker.
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* With the unit fake `ng` (no `doc_subscribe`), `ensureRepoOpen` is a no-op
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* (getSyncState → "unknown") and the single read is immediate — synchronous
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* behaviour preserved, no lag to wait out.
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*/
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async function resolveAccountReliably(id: string): Promise<AccountRecord | null> {
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// Cache hit → session-idempotent, no query, no fork risk.
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const cached = accountCache.get(accountKey(id));
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if (cached) return cached;
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const budget = getStoreRegistryDeps().provisionRetry;
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const attempts = Math.max(1, budget.attempts ?? 8);
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const baseMs = budget.baseMs ?? 300;
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const maxStepMs = budget.maxStepMs ?? 1500;
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// The shim lives in the private store. Open/subscribe it and await the first
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// `State` push (the sync barrier). NURI: `did:ng:${session.privateStoreId}`.
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const nuri = await anchorNuri();
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await ensureRepoOpen(nuri);
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for (let attempt = 0; attempt < attempts; attempt++) {
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const found = await resolveAccount(id);
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if (found) return found;
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if (attempt === attempts - 1) break; // budget exhausted → genuinely absent
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// The shim anchor repo may not be synced on a fresh session; open it once so
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// the broker pushes its state, then back off before the next targeted read.
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try {
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await ensureRepoOpen(await anchorNuri());
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} catch {
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/* tolerant: a failed open just leaves the next read to behave as before */
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// Conservative timed-out guard: if the barrier did not confirm sync,
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// provisioning blind risks creating a fork. Raise a clear error — the caller
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// (or the app's retry-login flow) should re-attempt when the broker is reachable.
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// "unknown" means the fake-ng no-op path: no barrier semantics → safe to read.
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const syncResult = getSyncState(nuri);
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if (syncResult === "timed-out") {
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throw new Error(
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"[storeRegistry] sync barrier timed out for the private store — " +
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"shim state unconfirmed, refusing to provision to avoid account fork. " +
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"Retry when the broker is reachable.",
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);
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}
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const step = Math.min(baseMs * 2 ** attempt, maxStepMs);
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await new Promise((r) => setTimeout(r, step));
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}
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return null;
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// Barrier reached (or fake-ng "unknown" path): single read, result is definitive.
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return resolveAccount(id);
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}
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/** All known accounts (from the shim). */
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@@ -346,13 +352,13 @@ export async function ensureAccount(id: string): Promise<AccountRecord> {
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// HOT PATH: targeted O(1) lookup — does THIS account already exist? — instead
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// of a full-shim scan (loadShim). Off the read/write hot path entirely.
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//
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// ANTI-FORK (polyfill-era): resolve with a BOUNDED retry, NOT a single read.
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// A single 0-row read on a fresh, still-syncing session would misfire as
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// "new account" and RE-PROVISION a second set of scope docs (the fork — see
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// the PROVISION_RETRY_* note at the top of this module). We only fall through
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// to provisioning once the whole retry budget has confirmed 0 rows. A cache
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// hit inside resolveAccountReliably keeps same-session resolves free and
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// deterministic (the cached record wins over any re-provision).
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// ANTI-FORK (polyfill-era): open the private-store repo and await its first
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// `State` push (the sync barrier) BEFORE reading the shim, so a 0-row result
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// is DEFINITIVE rather than a lag artifact. Only after the barrier do we treat
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// 0 rows as "genuinely new" and provision. A cache hit inside
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// resolveAccountReliably keeps same-session resolves free and deterministic
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// (the cached record wins over any re-provision). Throws if the barrier timed
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// out — safer than provisioning blind and creating a fork.
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const existing = await resolveAccountReliably(id);
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if (existing) return existing;
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@@ -2,16 +2,17 @@
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* anti-fork.test.ts — behavioral tests for the ANTI-FORK guard in ensureAccount /
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* resolveAccountReliably (src/store-registry.ts).
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*
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* The guard is: before treating a 0-row read as "genuinely new account" and
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* provisioning a new set of scope docs, the registry retries a bounded number of
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* times (with ensureRepoOpen + backoff between each). If the account IS found on
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* any attempt, it is reused (no second set of docs = no fork). Only if EVERY
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* attempt still reads 0 rows does the registry treat it as a first-time account
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* and provision exactly once.
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* The guard is: BEFORE reading the shim, open the private-store repo and await
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* the first `State` push (the deterministic sync barrier, CONTRACT 3). After the
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* barrier, 0 rows is DEFINITIVE (account genuinely absent) → provision exactly
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* once; rows present → reuse (NO-FORK). No retry loop, no polling.
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*
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* This file uses a FAKE `ng` that simulates broker sync lag: the sparql_query for
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* the account record returns 0 rows for the first K calls, then returns real rows.
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* We control the retry budget via `provisionRetry.attempts`.
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* With the unit fake `ng` (no `doc_subscribe`), `ensureRepoOpen` is a no-op
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* (getSyncState → "unknown") and the single shim read is immediate — no lag to
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* wait out, synchronous behaviour preserved.
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*
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* Timed-out barrier: if the barrier expires without a `State`, we refuse to
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* provision (throwing a clear error) rather than risk a fork.
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*/
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import { describe, it, expect, mock, beforeEach, afterAll } from "bun:test";
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@@ -26,7 +27,7 @@ import {
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resetStoreRegistry,
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resetConfig,
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} from "../src/polyfill";
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import { resetOpenedRepos } from "../src/open-repo";
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import { resetOpenedRepos, _forceOpenedSyncState } from "../src/open-repo";
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afterAll(() => {
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resetConfig();
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@@ -38,11 +39,11 @@ afterAll(() => {
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const SESSION: RegistrySession = { sessionId: "sid-af", privateStoreId: "PRIV-AF" };
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// ---------------------------------------------------------------------------
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// Fake ng with sync-lag simulation
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// Fake ng — simple in-memory store (no doc_subscribe → fake-ng no-op path)
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//
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// `lagCalls` controls how many account-record reads return 0 rows before the
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// real data is visible. Each call to sparql_query that matches the account
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// SELECT decrements the counter; once it hits 0 the real data is returned.
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// Queries return data from the `quads` array immediately. No lag simulation:
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// the barrier mechanism (ensureRepoOpen) is a no-op in the fake-ng path, so
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// the single shim read after "the barrier" is already authoritative.
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// ---------------------------------------------------------------------------
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interface Quad { g: string; s: string; p: string; o: string }
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@@ -60,7 +61,7 @@ function unescapeLiteral(s: string): string {
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return out;
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}
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function makeLaggedNg(lagCalls: number) {
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function makeFakeNg() {
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const quads: Quad[] = [];
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let docCounter = 0;
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let accountQueryCount = 0;
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@@ -100,15 +101,9 @@ function makeLaggedNg(lagCalls: number) {
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const anchor = a[3] as string | undefined;
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if (query.includes("<urn:ng-eventually:shim:id>")) {
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// This is an account SELECT (resolveAccount / loadShim)
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// Account SELECT (resolveAccount / loadShim)
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accountQueryCount++;
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// Still in the lag window → pretend the store hasn't synced yet
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if (accountQueryCount <= lagCalls) {
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return { results: { bindings: [] } };
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}
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// Lag lifted → return real data from the quads store
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const subjM = query.match(/GRAPH <[^>]+>\s*\{\s*<([^>]+)>\s+a\s+<urn:ng-eventually:shim:Account>/);
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const onlySubject = subjM ? subjM[1]! : null;
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const bySubject = new Map<string, Record<string, string>>();
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@@ -149,12 +144,14 @@ function makeLaggedNg(lagCalls: number) {
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};
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}
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function inject(laggedNg: ReturnType<typeof makeLaggedNg>, attempts: number) {
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configure({ ng: laggedNg as any, useShape: (() => {}) as any });
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function inject(fakeNg: ReturnType<typeof makeFakeNg>) {
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// No doc_subscribe → ensureRepoOpen is a no-op (fake-ng path).
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configure({ ng: fakeNg as any, useShape: (() => {}) as any });
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configureStoreRegistry({
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getSession: async () => SESSION,
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normalizeId: (u) => u.trim().toLowerCase(),
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provisionRetry: { attempts, baseMs: 0, maxStepMs: 0 },
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// provisionRetry is now unused by the barrier mechanism; kept for API compat.
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provisionRetry: { attempts: 1 },
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});
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resetRegistryCache();
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resetOpenedRepos();
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@@ -164,104 +161,97 @@ function inject(laggedNg: ReturnType<typeof makeLaggedNg>, attempts: number) {
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// Tests
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// ---------------------------------------------------------------------------
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describe("anti-fork: resolveAccountReliably / ensureAccount", () => {
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describe("anti-fork: barrier-first resolveAccountReliably / ensureAccount", () => {
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beforeEach(() => {
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resetRegistryCache();
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resetOpenedRepos();
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});
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it("(a) sync lag: 0 rows for K-1 calls then real rows → reuses existing docs (no fork)", async () => {
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// budget = 3 attempts; lag = 1 call (the first targeted read returns 0,
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// but the second (after retry) returns the real data written in the same
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// session before the cache was dropped). We simulate a scenario where the
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// account IS already provisioned (written to quads by a previous
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// ensureAccount call in an earlier "session"), then we reset the cache and
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// re-call with lag to simulate broker sync delay.
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it("(a) NO-FORK: account already in shim → reused, 0 new doc_create", async () => {
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// Provision an account in an initial "session" (quads are written).
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const fakeNg = makeFakeNg();
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inject(fakeNg);
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const first = await ensureAccount("LauraBarrier");
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expect(fakeNg.doc_create).toHaveBeenCalledTimes(3);
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const laggedNg = makeLaggedNg(0); // no lag — first provision a real account
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inject(laggedNg, 1);
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const first = await ensureAccount("LauraLag");
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expect(laggedNg.doc_create).toHaveBeenCalledTimes(3);
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// Simulate a fresh session: clear caches but keep quads intact (same fakeNg).
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// In the barrier model the single post-barrier read finds the account immediately.
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resetRegistryCache();
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resetOpenedRepos();
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// Now simulate a fresh session with lag: cache cleared, first K reads are 0
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// We reuse the SAME quads store (same laggedNg with quads intact) but
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// rebuild with lag > 0 so the first read returns 0, then real data.
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const laggedNg2 = makeLaggedNg(1); // 1 empty read before real data
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// Copy the quads from the first ng into laggedNg2 so it "knows" the account
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for (const q of laggedNg._quads) {
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laggedNg2._quads.push(q);
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}
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inject(laggedNg2, 3); // 3 attempts, lag=1 → second attempt succeeds
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const second = await ensureAccount("LauraBarrier");
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const second = await ensureAccount("LauraLag");
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// ANTI-FORK: must return the SAME scope docs — no new doc_create
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// ANTI-FORK: same scope docs returned, no new provisioning
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expect(second.docPublic).toBe(first.docPublic);
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expect(second.docProtected).toBe(first.docProtected);
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expect(second.docPrivate).toBe(first.docPrivate);
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// doc_create must NOT have been called (the lagged ng2 finds the account on retry)
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expect(laggedNg2.doc_create).toHaveBeenCalledTimes(0);
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expect(fakeNg.doc_create).toHaveBeenCalledTimes(3); // still exactly 3, not 6
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});
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it("(b) always-0 rows (genuinely new account): provisions exactly ONCE (1 set of docs)", async () => {
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// Lag longer than the retry budget → account is treated as new
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const laggedNg = makeLaggedNg(999); // always returns 0 for account queries
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inject(laggedNg, 2); // budget: 2 attempts, both see 0 → provision
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it("(b) genuinely new account (fake returns 0 rows) → provisioned exactly once (3 doc_create)", async () => {
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const fakeNg = makeFakeNg(); // empty quads → 0 rows on any account query
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inject(fakeNg);
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const rec = await ensureAccount("NewUser");
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const rec = await ensureAccount("BrandNewUser");
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// Exactly 3 doc_create calls (1 set of scope docs)
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expect(laggedNg.doc_create).toHaveBeenCalledTimes(3);
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// Exactly 3 doc_create calls (1 set of scope docs, no fork)
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expect(fakeNg.doc_create).toHaveBeenCalledTimes(3);
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expect(rec.docPublic).toMatch(/^did:ng:o:doc/);
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||||
expect(rec.docProtected).not.toBe(rec.docPublic);
|
||||
expect(rec.docPrivate).not.toBe(rec.docProtected);
|
||||
// Verify budget was fully consumed: both attempts fired before provisioning
|
||||
expect(laggedNg.getAccountQueryCount()).toBe(2);
|
||||
// Single read — no retry loop
|
||||
expect(fakeNg.getAccountQueryCount()).toBe(1);
|
||||
});
|
||||
|
||||
it("idempotence within a session: calling ensureAccount twice never creates 2 sets", async () => {
|
||||
const laggedNg = makeLaggedNg(0); // no lag
|
||||
inject(laggedNg, 1);
|
||||
it("(c) idempotence within a session: calling ensureAccount twice never creates 2 sets", async () => {
|
||||
const fakeNg = makeFakeNg();
|
||||
inject(fakeNg);
|
||||
|
||||
const a = await ensureAccount("SameUser");
|
||||
const b = await ensureAccount("SameUser");
|
||||
|
||||
expect(b).toEqual(a);
|
||||
// Must still be exactly 3 (not 6)
|
||||
expect(laggedNg.doc_create).toHaveBeenCalledTimes(3);
|
||||
expect(fakeNg.doc_create).toHaveBeenCalledTimes(3);
|
||||
});
|
||||
|
||||
it("retry budget of 1 (sync fake): a genuinely-absent account provisions without extra retries", async () => {
|
||||
const laggedNg = makeLaggedNg(0); // will never return lag (account not in quads)
|
||||
inject(laggedNg, 1);
|
||||
it("(d) fake-ng no-op barrier path: single shim read, no doc_subscribe calls", async () => {
|
||||
// The fake ng has no doc_subscribe → ensureRepoOpen is a no-op (getSyncState → "unknown").
|
||||
// resolveAccountReliably must proceed to the single read without waiting or throwing.
|
||||
const fakeNg = makeFakeNg(); // no doc_subscribe
|
||||
inject(fakeNg);
|
||||
|
||||
await ensureAccount("BrandNew");
|
||||
// Provision once, then verify a second resolve (fresh cache) finds it immediately.
|
||||
const first = await ensureAccount("FakeNgUser");
|
||||
resetRegistryCache();
|
||||
resetOpenedRepos();
|
||||
|
||||
// 3 scope docs created exactly once
|
||||
expect(laggedNg.doc_create).toHaveBeenCalledTimes(3);
|
||||
// The targeted account query was called exactly once (no retries at attempts=1)
|
||||
const accountQueryCalls = laggedNg.getAccountQueryCount();
|
||||
expect(accountQueryCalls).toBe(1);
|
||||
const second = await ensureAccount("FakeNgUser");
|
||||
|
||||
// Same docs reused (no fork), exactly 3 total doc_create across both calls
|
||||
expect(second.docPublic).toBe(first.docPublic);
|
||||
expect(fakeNg.doc_create).toHaveBeenCalledTimes(3);
|
||||
// The account query was called exactly twice (once per ensureAccount, no retries)
|
||||
expect(fakeNg.getAccountQueryCount()).toBe(2);
|
||||
});
|
||||
|
||||
it("lag of exactly (attempts-1): found on last allowed attempt → reused, not forked", async () => {
|
||||
// 3 attempts, lag=2 (first 2 calls return 0, 3rd returns real data).
|
||||
// We pre-populate the quads by provisioning with a fresh no-lag ng first.
|
||||
const seedNg = makeLaggedNg(0);
|
||||
inject(seedNg, 1);
|
||||
const original = await ensureAccount("EdgeUser");
|
||||
expect(seedNg.doc_create).toHaveBeenCalledTimes(3);
|
||||
it("(e) timed-out barrier: resolveAccountReliably throws rather than provisioning", async () => {
|
||||
// Simulate: the private store nuri is already in the `opened` set but with
|
||||
// sync state "timed-out" (forced via _forceOpenedSyncState so the test
|
||||
// does not have to wait 8s for the real OPEN_TIMEOUT_MS to fire).
|
||||
const fakeNg = makeFakeNg(); // empty quads → 0 rows
|
||||
inject(fakeNg);
|
||||
|
||||
// Now re-inject with the same quads but with lag=2, budget=3
|
||||
const laggedNg = makeLaggedNg(2);
|
||||
for (const q of seedNg._quads) laggedNg._quads.push(q);
|
||||
inject(laggedNg, 3);
|
||||
// Force the private-store nuri ("did:ng:PRIV-AF") into timed-out state.
|
||||
// resolveAccountReliably calls anchorNuri() → `did:ng:${privateStoreId}`.
|
||||
_forceOpenedSyncState("did:ng:PRIV-AF", "timed-out");
|
||||
|
||||
const retried = await ensureAccount("EdgeUser");
|
||||
// ensureAccount must throw (conservative anti-fork guard: do not provision blind)
|
||||
await expect(ensureAccount("TimedOutUser")).rejects.toThrow(
|
||||
/sync barrier timed out/,
|
||||
);
|
||||
|
||||
// Found on the 3rd attempt (lag=2 means first 2 return 0, 3rd returns real)
|
||||
expect(retried.docPublic).toBe(original.docPublic);
|
||||
expect(retried.docProtected).toBe(original.docProtected);
|
||||
expect(laggedNg.doc_create).toHaveBeenCalledTimes(0); // no new provisioning
|
||||
// Must NOT have created any scope docs (refusing to provision)
|
||||
expect(fakeNg.doc_create).toHaveBeenCalledTimes(0);
|
||||
});
|
||||
});
|
||||
|
||||
Reference in New Issue
Block a user