☕

Lihai Ben-Haim lihaibh

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A passionate programmer

lihaibh / exponential-backoff-retry.util.ts

Last active February 24, 2023 13:39

An elegant way of performing exponential backoff retries on an async operation, using rxjs streams

	import { Type } from '@nestjs/common';
	import { defer, lastValueFrom, switchMapTo, throwError, timer } from 'rxjs';

	import { catchError } from 'rxjs/operators';

	export function withRetry<
	T,
	F extends (...args: any[]) => Promise<T>,
	>(options: { retries: number; exceptErrors?: Type<Error>[]; fn: F }): F {
	return (async (...args) => {

lihaibh / rate-limit.util.ts

Last active February 24, 2023 13:39

Rate limit wrapper - wraps an async function, make sure the calls do not exceed the rate limit

	export function withRateLimit<T, E extends (...args: any[]) => Promise<T>>({ fn, limit, every }: {
	fn: E,
	// maximum amount of executions in specific amount of time
	limit: number,
	// the amount in milliseconds we are limiting the total amount of executions
	every: number
	}): E {
	let lastExecTime = -1;
	let requestCounter = 0;
	let triggerFlushTimeout = null;

lihaibh / return-type.ts

Last active February 24, 2023 13:39

Get return type of a function

	async function getItems() {
	const requestTime = new Date();
	const response = await fetch('http://myservice/items');
	const items = (await response.json()) as { id: string; price: number }[];
	const responseTime = new Date();

	return {
	items,
	requestTime,
	responseTime,

lihaibh / cypress.config.ts

Last active October 11, 2022 10:34

Cypress: code coverage configuration

	import { defineConfig } from 'cypress';

	let codeCoverageEnv = {};

	// make sure code coverage is enabled
	if (process.env.CODE_COVERAGE_ENABLED === 'true') {
	codeCoverageEnv = {
	codeCoverage: {
	url: `${
	process.env.cypress_baseUrl \|\| 'http://backend:9001'

lihaibh / backup-disk.sh

Last active August 4, 2018 19:10

create snapshot of a remote linux disk to your local machine

	#/usr/bin/env sh
	SSH_HOST=host.name
	BACKUP_DISK="sda"
	DISK_SIZE_BYTES=`expr 1073741824 \* $(ssh $SSH_HOST "lsblk --all \| grep \"$BACKUP_DISK\" \| head -1" \| while read c1; do echo $c1; done \| cut -d" " -f4 \| sed "s/G//g")`
	BLOCK_SIZE=512
	IMAGE_NAME="./sda.disk"

	[ -f $IMAGE_NAME ] && IMAGE_CUR_SIZE=$(stat -c "%s" $IMAGE_NAME) \|\| IMAGE_CUR_SIZE=0
	WRITEN_BLOCKS=$(($IMAGE_CUR_SIZE / $BLOCK_SIZE))
	echo -e "Current clone file size: \e[1m$IMAGE_CUR_SIZE\e[0m, total remote disk size: \e[1m$DISK_SIZE_BYTES\e[0m"

lihaibh / MariaDB.repo

Created February 13, 2016 07:57

MariaDB.repo for CentOS7 (64 bit)

	# MariaDB 10.1 CentOS repository list - created 2016-02-13 07:56 UTC
	# http://mariadb.org/mariadb/repositories/
	[mariadb]
	name = MariaDB
	baseurl = http://yum.mariadb.org/10.1/centos7-amd64
	gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
	gpgcheck=1