perf(realtime): make dashboard JSON diff linear

2026-08-12 16:05:49 +00:00
parent 1e196e200f
commit 421b190bf2
4 changed files with 185 additions and 4 deletions
@@ -52,6 +52,11 @@ export const buildReadModelDeltaCacheKey = (
 const canPatch = (value: unknown): value is Record<string, unknown> | unknown[] =>
    value !== null && typeof value === 'object';

+const snapshotByteLength = (revision: string, serialized: string): number =>
+    Buffer.byteLength(`{"kind":"snapshot","revision":${JSON.stringify(revision)},"data":`) +
+    Buffer.byteLength(serialized) +
+    1;
+
 const storeSnapshot = async (store: ReadModelDeltaCacheStore, key: string, serialized: string): Promise<void> => {
    try {
        await store.set(key, serialized, { EX: CACHE_TTL_SECONDS });
@@ -91,7 +96,7 @@ export const createReadModelDelta = async <T>(request: ReadModelDeltaRequest<T>)
                    };
                    const snapshot = { kind: 'snapshot' as const, revision, data: canonicalValue };
                    await storeSnapshot(request.store, currentKey, serialized);
-                    return Buffer.byteLength(JSON.stringify(patch)) < Buffer.byteLength(JSON.stringify(snapshot))
+                    return Buffer.byteLength(JSON.stringify(patch)) < snapshotByteLength(revision, serialized)
                        ? patch
                        : snapshot;
                }