node-throttler

node-throttler is a HTTP traffic throttler.

Installation

npm install node-throttler

Overview

node-throttler is built on top of node-http-proxy. It provides following features.

• throttles traffic by setting a maximum request rate threshold
• throttles traffic by setting a maximum response time threshold
• applies different throttle rates to different URL patterns

Usage

• Starts node-throttler

proxy --config <config_file> --log <log_level>

where config is a JSON configuration file and log defines the logging level.

• Runs tests

make test

• Generates JS documents

make docs

Configuration

The configuration file is itself a JSON object consists of following fields.

• local_port
  the port on which the throttler will listen

• remote_host
  the host of the remote service to be throttled

• remote_port
  the port of the remote service to be throttled

• throttle_type
  either rps or averesp

• throttle_key_config
  defines how the throttle rate key is calculated from the request object. If absent, a constant value is used which means the same threshold value will be applied to all requests

• throttle_threshold_config
  defines how the threshold value is calculated for a request. If it is a constant number, then the value will be applied to all requests

• max_throttle_time
  defines the maximum throttle time allowed.

Following fields only apply to rps style

• max_queue_len
  maximum number of requests can be queued before further requests are rejected

Following fields only apply to averesp style

• max_sample_age
  the oldest sample that can be used to compute average response time

• min_sample_size
  the minimum sampel size required to compute average response time

• max_sample_size
  the maximum sampel size required to compute average response time

License

MIT License