serverless-spy
Version:
CDK-based library for writing elegant integration tests on AWS serverless architecture and an additional web console to monitor events in real time.
20 lines (19 loc) • 713 B
JavaScript
import { HashCalculator } from "./HashCalculator";
export const readableStreamHasher = (hashCtor, readableStream) => {
if (readableStream.readableFlowing !== null) {
throw new Error("Unable to calculate hash for flowing readable stream");
}
const hash = new hashCtor();
const hashCalculator = new HashCalculator(hash);
readableStream.pipe(hashCalculator);
return new Promise((resolve, reject) => {
readableStream.on("error", (err) => {
hashCalculator.end();
reject(err);
});
hashCalculator.on("error", reject);
hashCalculator.on("finish", () => {
hash.digest().then(resolve).catch(reject);
});
});
};