Node.js status aggregation object. Used by the Ravenwall node.js agent.
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statware.js

README.md

statware

NPM

Node.js status monitoring wares.

var statware = require("statware")

var stats = statware()

// Optionally install pre-defined metric collections
stats.installProcessInfo()
stats.installSystemInfo()

// Register an asynchronous middleware helper
stats.registerHelper(function (status, next) {
  status.foo = (new Date()).toString()
  next()
})

// Set values manually
stats.set("cat", "meow")

// Incrementers
stats.increment("lines")
stats.increment("lines")
stats.increment("lines")

// windowed stats -- keeps the last `windowSize` records and reports on them
var windowed = stats.windowedStat("games", 10)
windowed.push(50)
windowed.push(100)
windowed.push(75)

// rolling stats for the lifetime of the process
var s = stats.addStat("ht")
s.update(40)
s.update(1000)
s.update(352)
s.update(550)

// namespaces

var ns = stats.namespace("ns")
ns.increment("foo")

// now read the stats by providing a callback function
stats.getStats(function (metrics) {
  console.log(metrics)
})

/*
  { cat: 'meow',
  lines: 3,
  ns: { foo: 1 },
  process_info:
   { uptime: 0,
     memory: { rss: 13094912, heapTotal: 6163968, heapUsed: 1938952 },
     active_requests: 0,
     active_handles: 0,
     versions:
      { http_parser: '1.0',
        node: '0.10.28',
        v8: '3.14.5.9',
        ares: '1.9.0-DEV',
        uv: '0.10.27',
        zlib: '1.2.3',
        modules: '11',
        openssl: '1.0.1g' },
     node_env: '',
     pid: 61429,
     title: 'node',
     user: 'bryce' },
  system_info:
   { freemem: 2590896128,
     totalmem: 17179869184,
     arch: 'x64',
     platform: 'darwin',
     uptime: 4015625,
     loadavg: { '1m': 4.21923828125, '5m': 4.244140625, '15m': 4.0029296875 },
     cores: 8,
     cpu_model: 'Intel(R) Core(TM) i7-4960HQ CPU @ 2.60GHz',
     cpu_speed: 2600 },
  foo: 'Sun Jun 08 2014 20:23:48 GMT-0700 (PDT)',
  games: { n: 3, min: 50, max: 100, mean: 75 },
  ht:
   { n: 4,
     min: 40,
     max: 1000,
     sum: 1942,
     mean: 485.5,
     variance: 121290.75,
     standard_deviation: 348.2682156040083 },
  statware: { checktime: 1402284228839, stats_runtime: 0.001205082 } }
*/

API

Statware([initial])

Create a statware stats instance, with optional initial value object of initial.

statwareInstance.getStats(callback)

Fetch the stats object. The callback should be of form callback(statsObject) where statsObject is a pure Js object with the statware internal stats.

statwareInstance.registerHelper(helper)

Register an asynchronous helper function to be called whenever stats.getStats(cb) is called. The helper must be in the form of helper(statsObject, next) and must call next() one time. The statsObject is the internal stats object from statware and can be mutated to add, remove, or modify values. Returns itself for chaining.

statwareInstance.set(key, value)

Set a key to a value explicitly

statwareInstance.increment(key)

Update an incrementing key

var fixedArray = statwareInstance.windowedStat(key, windowSize)

Create a FixedArray at key that will have n, min, max, mean reported for it at each getStats() call.

var statsIncremental = statwareInstance.addStat(key)

Create a stats-incremental instance that will report getAll() every time getStats() is run.

var namespace = statwareInstance.namespace(name)

Create a top-level namespace inside the statInstance that behaves almost identically to statwareInstance except it cannot define deeper namespaces.

stawareInstance.installProcessInfo()

Register a pre-defined helper that collects a set of process-related information.

statwareInstance.installSystemInfo()

Register a pre-defined helper that collects a set of system-related information.

LICENSE

MIT