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chunk-rate-readable
Measures the rate at which a given stream emits data chunks and streams the result.
Last updated 7 years ago by thlorenz .
MIT · Repository · Bugs · Original npm · Tarball · package.json
$ cnpm install chunk-rate-readable 
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Measures the rate at which a given stream emits data chunks and streams the result.

var chunkRate = require('chunk-rate-readable')
  , numbers = require('../test/fixtures/number-readable');

var numbersStream = numbers({ to: 30, throttle: 200 })

var last = 0;
chunkRate(numbersStream, { objectMode: true })
  .on('data',  function (rate) {
    var indicator = rate === last 
      ? '='
      : rate > last ? '▲' : '▼';
    console.log('%d -> %s', rate, indicator);
    last = rate;
  });

example output

Installation

npm install chunk-rate-readable

API

###function ChunkRateReadable (stream[, opts])

Creates a readable stream that will emit how many chunks the given stream emitted during the given interval.

@name ChunkRateReadable @function params:

  • stream ReadableStream whose chunk rate is measured
  • opts Object with the following properties:
    • objectMode {Boolean} if true rate is emitted as actual numbers, otherwise as buffers
    • interval {Number} at which to measure the rate (default: rate/500ms)

returns:

ReadableStream that will emit updates about the chunk rate of the given stream.

###chunkRateReadable.endSoon

Call this in case you want to tell the rate stream to end. Useful for testing and/or when you want to end your debugging session and allow the program to exit.

Similar Modules

  • speed-meter measures the number of emitted bytes (vs. number of chunks) over a given time period

License

MIT

Current Tags

  • 0.1.1                                ...           latest (7 years ago)

2 Versions

  • 0.1.1                                ...           7 years ago
  • 0.1.0                                ...           7 years ago
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