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kinesis

kinesis

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A Node.js stream implementation of Amazon's Kinesis.

Allows the consumer to pump data directly into (and out of) a Kinesis stream.

This makes it trivial to setup Kinesis as a logging sink with Bunyan, or any other logging library.

For setting up a local Kinesis instance (eg for testing), check out Kinesalite.

NB: API has changed from 0.x to 1.x

Example

var fs = require('fs'),
    Transform = require('stream').Transform,
    kinesis = require('kinesis'),
    KinesisStream = kinesis.KinesisStream
 
// Uses credentials from process.env by default 
 
kinesis.listStreams({region: 'us-west-1'}, function(err, streams) {
  if (err) throw err
 
  console.log(streams)
  // ["http-logs", "click-logs"] 
})
 
 
var kinesisSink = kinesis.stream('http-logs')
// OR new KinesisStream('http-logs') 
 
fs.createReadStream('http.log').pipe(kinesisSink)
 
 
var kinesisSource = kinesis.stream({name: 'click-logs', oldest: true})
 
// Data is retrieved as Record objects, so let's transform into Buffers 
var bufferify = new Transform({objectMode: true})
bufferify._transform = function(record, encoding, cb) {
  cb(null, record.Data)
}
 
kinesisSource.pipe(bufferify).pipe(fs.createWriteStream('click.log'))
 
 
// Create a new Kinesis stream using the raw API 
kinesis.request('CreateStream', {StreamName: 'test', ShardCount: 2}, function(err) {
  if (err) throw err
 
  kinesis.request('DescribeStream', {StreamName: 'test'}, function(err, data) {
    if (err) throw err
 
    console.dir(data)
  })
})

API

kinesis.stream(options)

new KinesisStream(options)

Returns a readable and writable Node.js stream for the given Kinesis stream

options include:

  • region: a string, or (deprecated) object with AWS credentials, host, port, etc (resolved from env or file by default)
  • credentials: an object with accessKeyId/secretAccessKey properties (resolved from env, file or IAM by default)
  • shards: an array of shard IDs, or shard objects. If not provided, these will be fetched and cached.
  • oldest: if truthy, then will start at the oldest records (using TRIM_HORIZON) instead of the latest
  • writeConcurrency: how many parallel writes to allow (1 by default)
  • cacheSize: number of PartitionKey-to-SequenceNumber mappings to cache (1000 by default)
  • agent: HTTP agent used (uses Node.js defaults otherwise)
  • timeout: HTTP request timeout (uses Node.js defaults otherwise)
  • initialRetryMs: first pause before retrying under the default policy (50 by default)
  • maxRetries: max number of retries under the default policy (10 by default)
  • errorCodes: array of Node.js error codes to retry on (['EADDRINFO', 'ETIMEDOUT', 'ECONNRESET', 'ESOCKETTIMEDOUT', 'ENOTFOUND', 'EMFILE'] by default)
  • errorNames: array of Kinesis exceptions to retry on (['ProvisionedThroughputExceededException', 'ThrottlingException'] by default)
  • retryPolicy: a function to implement a retry policy different from the default one

kinesis.listStreams([options], callback)

Calls the callback with an array of all stream names for the AWS account

kinesis.request(action, [data], [options], callback)

Makes a generic Kinesis request with the given action (eg, ListStreams) and data as the body.

options include:

  • region: a string, or (deprecated) object with AWS credentials, host, port, etc (resolved from env or file by default)
  • credentials: an object with accessKeyId/secretAccessKey properties (resolved from env, file or IAM by default)
  • agent: HTTP agent used (uses Node.js defaults otherwise)
  • timeout: HTTP request timeout (uses Node.js defaults otherwise)
  • initialRetryMs: first pause before retrying under the default policy (50 by default)
  • maxRetries: max number of retries under the default policy (10 by default)
  • errorCodes: array of Node.js error codes to retry on (['EADDRINFO', 'ETIMEDOUT', 'ECONNRESET', 'ESOCKETTIMEDOUT', 'ENOTFOUND', 'EMFILE'] by default)
  • errorNames: array of Kinesis exceptions to retry on (['ProvisionedThroughputExceededException', 'ThrottlingException'] by default)
  • retryPolicy: a function to implement a retry policy different from the default one