bottleneck
async
bottleneck | async | |
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9 | 16 | |
1,744 | 28,077 | |
- | - | |
0.0 | 8.1 | |
4 months ago | 6 days ago | |
JavaScript | JavaScript | |
MIT License | MIT License |
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bottleneck
- How can i improve my web scraper to be less abusive to the website.
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Hey guys. Any good idea to make so users can only send 20 api requests per hours in express node js. Any good package or code ? Thanks in advance
bottleneck
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Bottleneck not working for Deno? What's a good replacement?
I tried to use the Bottleneck library to rate limit a script that needs to make a lot of calls to a 3rd party API in Deno. However, to my surprise it just has no effect, even when tested on small toy examples. I didn't try it in Node or the browser. Is there a reason why this library just wouldn't work on the Deno runtime? Is there a good alternative? It's a hard thing to google for because results tend to be either cron or server-side libraries.
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Newbie Help: Telegraf telegram bot with async/fetch, media send and async management
If you have trouble with floods of traffic, use a rate limiter. Check out https://www.npmjs.com/package/bottleneck
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Struggling with very large cron jobs in node
Perhaps some streaming (native streams or some observables like rxjs) solution combined with rate limiting like https://www.npmjs.com/package/bottleneck ?
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External API integrations from a microservice architecture
In general, you should avoid reinventing the wheel, so we looked for libraries which could solve our problem. We found BottleneckJS and decided to try to use it for our initial prototype.
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what's your hidden gem package?
Between tiny-async-pool and bottleneck I can suck data from any api very efficiently and within rate limits
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What is the best way of API Request throttling to match API Provider's limits?
Ah, this looks really nice! https://www.npmjs.com/package/bottleneck
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Wait, Wait, Wait ... Now Go! ⌚⏳
As we can see here, in order to not violate the rate limiting rule, we must have 5 attempts at the API per minute or wait at lease 200 milliseconds between the executions. This was not that hard, but wait, JavaScript is asynchronous in nature. How will we make it run synchronously and sequentially ? The real question we are actually asking is, how do we make it that the HTTP requests to the remote API will wait the minimum delay time in between the executions. This is where we are going to use the tool that is called BottleNeck.
async
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Avoid the Promise.all pitfall
Well you could just install the async package which has lots of useful functions like mapLimit which will reduce the burden and only run a number in parallel.
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What is this callback in async.parallel function?
Have you checked out the docs for the async library they are using?
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How to limit concurrency with Python asyncio?
Edit:2. What's a good library that takes care of common async patterns? (Something like async)
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I Avoid Async/Await
Async/await is certainly not promises. In fact it would be much better implemented without promises as I proposed here: https://es.discourse.group/t/callback-based-simplified-async...
I would even say that async/await is anti-promise, it takes the main functionality of promises, a caching layer for results and errors that allows you to add the code continuation later and elsewhere (which is a major footgun imo) and coerces the execution flow back to going on the next line and provided immediately at compile time which results in a cleaner flow but not as clean, stateless, efficient or functional as if you were to remove the promises completely. Having an additional caching layer and state machine around every asynchronous function call is quite inefficient.
The essence of async/await is not promises, it's the underlying javascript generator (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...) functionality combined with asynchronous code to stop and start the generator. It's the ability to pause and resume function execution based on asynchronous operations.
The promise functionality, the caching layer and state machine for results is basically sanitized away with async/await, it becomes dead-weight computation. The only benefit of promises in async/await code is being able to more easily interface with other promise laden code which you don't need once you have async/await and a library like https://www.npmjs.com/package/async for more complex cases.
Note that promises based async/await is also a mess of an implementation that breaks stack traces and needs to support tons of odd statement corner cases (basically anything that can return an object that could be a promise) whereas a continuation passing style async/await would be a much simpler implementation that would only apply to function calls and maintain stack traces. We get that stack trace support automatically because of the great work of whoever implemented javascript generators which seem to already carry stack traces across paused/resumed functions (if you don't wrap in promises).
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What is the difference between async.waterfall and async.series
The nodejs async module: https://github.com/caolan/async provides 2 similar methods, async.waterfall and async.series.
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JavaScript ES6 promise for loop [duplicate]
With async I'd simply use async.series().
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Some questions about events and promises
I don't understand. Sure you could spawn a ton of processes, but things might be bogged down. There are utilities out there for doing work queues.... so only N workers are running at any one time. The async library has some utilities for that. https://github.com/caolan/async
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Caolan Asyncjs vs Async/Await: Which One to Use for Async Operations in NodeJS
The documentation of asyncjs is quite straightforward and easy to read. As we've only seen a couple of use cases in this article, I'd recommend to go the asyncjs documentation and check out other possibilities with the library. You can also try to replicate the same using async/await to solidify your understanding of where the library might still make sense.
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[AskJS] How were asynchronous functions written before Promises?
It basically was tons and tons of callbacks. They'd nest weirdly deep and be a pain to work with. If you're curious, here's a link to one of my favorite JavaScript libraries from those days - it gave you a bunch of neat utilities for dealing with async code.
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Aren't promises just callbacks?
api(function(result){ api2(function(result2){ api3(function(result3){ // do work }); });}); Which I could use a library like async for anyway, with something like:
What are some alternatives?
axios-rate-limit - Rate limit for axios
Bluebird - :bird: :zap: Bluebird is a full featured promise library with unmatched performance.
bull - Premium Queue package for handling distributed jobs and messages in NodeJS.
moment - Parse, validate, manipulate, and display dates in javascript.
breeze.js - Breeze for JavaScript clients
q - A promise library for JavaScript
Newman - Newman is a command-line collection runner for Postman
contra - :surfer: Asynchronous flow control with a functional taste to it
Swagger Client - Javascript library to connect to swagger-enabled APIs via browser or nodejs
neo-async - Neo-Async is thought to be used as a drop-in replacement for Async, it almost fully covers its functionality and runs faster
node-object-hash - Node.js object hash library with properties/arrays sorting to provide constant hashes. It also provides a method that returns sorted object strings that can be used for object comparison without hashes.
Simple-Series-Parallel - A minimalist utility module for running async functions in series or parallel