Backpressure Handling in Async Generators

Snippet

Backpressure Handling in Async Generators

Async generators provide a natural way to implement backpressure. By awaiting a promise inside the generator before yielding, you can signal to the producer that the consumer is not ready for more data, effectively managing flow control in asynchronous streams.

snippet.js
javascript
async function* streamProcessor(source) {
  for await (const chunk of source) {
    if (needsThrottling()) {
      await new Promise(r => setTimeout(r, 100)); // Simulate backpressure
    }
    yield transform(chunk);
  }
}
 
const consumer = async () => {
  for await (const data of streamProcessor(dataSource)) {
    console.log(data);
  }
};

Breakdown

async function* streamProcessor

Defines a generator that can await asynchronous operations between yields.

for await (const chunk of source)

Consumes an asynchronous iterator while respecting its timing.

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Backpressure Handling in Async Generators

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