@asterql/view-protocol

npm install @asterql/view-protocol

Registered view definitions, deterministic view ids, canonical params, and a small handler shape for AsterQL.

This package is the bridge between "run this query locally" and "ship a cacheable UI data endpoint." Production requests use manifest-backed ids, while local tools can opt into raw query evaluation explicitly.

import {
  createViewCacheHeaders,
  createManifest,
  createViewHandler,
  createViewUrl,
  defineView,
} from "@asterql/view-protocol";

const recentOrders = defineView({
  service: "dashboard",
  query: `*.orders[status == $status] | sort(-createdAt)[:10]{id, total}`,
});

const manifest = createManifest([recentOrders]);
const url = createViewUrl(recentOrders, { status: "paid" });
const cacheHeaders = createViewCacheHeaders(recentOrders, { status: "paid" });

const handle = createViewHandler({
  views: [recentOrders],
  async load({ params }) {
    return loadDashboardData(params);
  },
});

API

• defineView(input): normalize a query and compute a deterministic view id.
• getViewId(view): return the content hash id for a view.
• createManifest(views): emit a stable manifest keyed by view id.
• createViewETag(view, params?, options?): compute a weak ETag from the view id, canonical params hash, and optional service data version.
• createViewCacheHeaders(view, params?, options?): create Cache-Control and ETag headers from the view cache policy.
• encodeParams(params) / decodeParams(value): base64url canonical JSON.
• createViewUrl(view, params?, options?): build /views/:viewId URLs.
• createViewHandler(options): execute registered views against host data.
• fetchView(view, params?, options?): tiny fetch helper for clients.

State sync primitives:

• createEntityKey(kind, id) / parseEntityKey(key): stable normalized entity ids in kind:id form.
• createScopeKey(kind, id) / parseScopeKey(scope): stable scope ids such as agent:agent_123.
• hashRecordVersion(input) and hashServerEventId(input): deterministic record/event ids over canonical JSON.
• ServerEvent, ServerEventEnvelope, EntityRecord, EntityPatch, and InvalidationClass: browser-safe wire and store contracts for normalized state sync.
• invalidationIntersects(a, b): match entity, entity-kind, scope, service, and view invalidation classes.
• parseEntityPath(path) / formatEntityPath(path): JSON Pointer helpers for patch paths.
• getEntityPathValue, setEntityPathValue, unsetEntityPathValue, applyEntityPatch, and applyEntityPatches: immutable JSON patch helpers for set, unset, merge, appendText, keyed insert, and removeKey.
• canonicalJsonBytes(value), sha256Base64Url(bytes), hashCanonicalJson(prefix, value), hashParams, hashSchema, and hashViewDefinition: canonical hashing helpers matching the package's existing view/schema/params ids.
• createVersionedViewETag(input) / parseVersionedViewETag(etag): weak ETags that embed the view id, canonical params hash, auth-scope hash, body hash, and a sorted invalidation-class version map, so revalidation can answer "did any class this view depends on advance?" from the ETag alone.
• formatInvalidationClass(class), classVersionFromDate(value), mergeClassVersions(...maps), advancedClassVersions(current, baseline, keys?), classVersionsFromETagPayload(payload), hashAuthScope(value), and ifNoneMatchIncludes(header, etag): the class-version vocabulary used by versioned ETags and invalidation-driven cache revalidation.

The handler only executes registered views by default. Registered view responses include explicit cache headers: views with a cache policy use that policy, and views without one are no-store. Raw dev _eval responses are always no-store and exist only when allowEval: true is passed.