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Example code of reactphp-x/limiter

Informations about the package limiter

reactphp-limiter

Provides a generic rate limiter for the web and node.js. Useful for API clients, web crawling, or other tasks that need to be throttled. Two classes are exposed, RateLimiter and TokenBucket. TokenBucket provides a lower level interface to rate limiting with a configurable burst rate and drip rate. RateLimiter sits on top of the token bucket and adds a restriction on the maximum number of tokens that can be removed each interval to comply with common API restrictions such as "150 requests per hour maximum".

Installation

Usage

A simple example allowing 150 requests per hour:

Another example allowing one message to be sent every 250ms:

The default behaviour is to wait for the duration of the rate limiting that's currently in effect before the promise is resolved, but if you pass in "fireImmediately": true, the promise will be resolved immediately with remainingRequests set to -1:

A synchronous method, tryRemoveTokens(), is available in both RateLimiter and TokenBucket. This will return immediately with a boolean value indicating if the token removal was successful.

To get the number of remaining tokens outside the removeTokens promise, simply use the getTokensRemaining method.

Using the token bucket directly to throttle at the byte level:

Additional Notes

Both the token bucket and rate limiter should be used with a message queue or some way of preventing multiple simultaneous calls to removeTokens(). Otherwise, earlier messages may get held up for long periods of time if more recent messages are continually draining the token bucket. This can lead to out of order messages or the appearance of "lost" messages under heavy load.

Tests

License

MIT License

All versions of limiter with dependencies

PHP Build Version
Package Version
Requires php Version ^8.1
react/promise Version ^3
react/async Version ^4.1
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