50 lines
1.8 KiB
Markdown
50 lines
1.8 KiB
Markdown
# stream-throttle #
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A rate limiter for Node.js streams.
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## API usage
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This module exports two classes, `Throttle` and `ThrottleGroup`.
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`Throttle` creates a single throttled stream, based on `stream.Transform`. It accepts an `opts` parameter with the following keys:
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* `opts.rate` is the throttling rate, in bytes per second.
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* `opts.chunksize` (optional) is the maximum chunk size into which larger writes are decomposed; the default is `opts.rate`/10.
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The `opts` object may also contain options to be passed to the `stream.Transform` constructor.
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For example, the following code throttles stdin to stdout at 10 bytes per second:
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process.stdin.pipe(new Throttle({rate: 10})).pipe(process.stdout)
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`ThrottleGroup` allows the creation of a group of streams whose aggregate bandwidth is throttled. The constructor accepts the same `opts` argument as for `Throttle`. Call `throttle` on a `ThrottleGroup` object to create a new throttled stream belonging to the group.
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For example, the following code creates two HTTP connections to `www.google.com:80`, and throttles their aggregate (downstream) bandwidth to 10 KB/s:
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var addr = { host: 'www.google.com', port: 80 };
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var tg = new ThrottleGroup({rate: 10240});
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var conn1 = net.createConnection(addr),
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conn2 = net.createConnection(addr);
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var thr1 = conn1.pipe(tg.throttle()),
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thr2 = conn2.pipe(tg.throttle());
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// Reads from thr1 and thr2 are throttled to 10 KB/s in aggregate
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## Command line usage
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This package installs a `throttleproxy` binary which implements a command-line utility for throttling connections. Run `throttleproxy -h` for instructions.
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## Contributing
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Feel free to open an issue or send a pull request.
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## License
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BSD-style. See the LICENSE file.
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## Author
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Copyright © 2013 Tiago Quelhas. Contact me at `<tiagoq@gmail.com>`.
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