@snap/camera-kit/dist/handlers/batchingHandler.js

Camera Kit Web

import { __awaiter } from "tslib";
import { createMappingHandler } from "./mappingHandler";
export const createBatchingHandler = ({ batchReduce, isBatchComplete, maxBatchAge, pageVisibility, }) => {
    let batchTimeout;
    let currentBatch = undefined;
    let clearOnHidden = () => { };
    const reducingHandler = createMappingHandler((request) => __awaiter(void 0, void 0, void 0, function* () {
        currentBatch = yield batchReduce(currentBatch, request);
        return currentBatch;
    }), pageVisibility, 1);
    const batchAndSend = (next, request, metadata) => {
        const batch = request ? batchReduce(currentBatch, request) : currentBatch;
        if (!batch)
            return;
        const complete = batch instanceof Promise
            ? batch.then((b) => next(b, metadata)).catch(() => { })
            : next(batch, metadata).catch(() => { });
        currentBatch = undefined;
        clearTimeout(batchTimeout);
        clearOnHidden();
        return complete;
    };
    return (next) => (request, metadata) => __awaiter(void 0, void 0, void 0, function* () {
        if (pageVisibility && pageVisibility.isDuringVisibilityTransition("hidden")) {
            yield batchAndSend(next, request, metadata);
            return;
        }
        if (currentBatch === undefined) {
            const sendBatch = () => batchAndSend(next, undefined, metadata);
            if (maxBatchAge !== undefined)
                batchTimeout = setTimeout(sendBatch, maxBatchAge);
            if (pageVisibility)
                clearOnHidden = pageVisibility.onPageHidden(sendBatch);
        }
        const handle = reducingHandler(() => __awaiter(void 0, void 0, void 0, function* () {
            if (!currentBatch)
                return;
            if (!isBatchComplete(currentBatch))
                return;
            yield batchAndSend(next, undefined, metadata);
        }));
        return handle(request, metadata);
    });
};
//# sourceMappingURL=batchingHandler.js.map