@saberhq/sail/dist/esm/accounts/fetchKeysUsingLoader.js

Account caching and batched loading for React-based Solana applications.

import zip from "lodash.zip";
import invariant from "tiny-invariant";
import { SailAccountLoadError } from "../errors";
export const fetchKeysUsingLoader = async (loader, keys) => {
    const keysWithIndex = keys.map((k, i) => [k, i]);
    const result = await loader.loadMany(keysWithIndex.map((k) => k[0]));
    const nextData = keys.map(() => ({ data: null }));
    zip(keysWithIndex, result).forEach(([indexInfo, keyResult]) => {
        invariant(indexInfo, "index info missing");
        invariant(keyResult !== undefined, "key result missing");
        const [accountId, nextIndex] = indexInfo;
        if (keyResult instanceof Error) {
            return (nextData[nextIndex] = {
                data: null,
                error: new SailAccountLoadError(keyResult, accountId),
            });
        }
        return (nextData[nextIndex] = {
            data: keyResult
                ? {
                    accountId,
                    accountInfo: keyResult,
                }
                : null,
        });
    });
    return nextData;
};
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