abacus-perf/lib/index.js

'use strict';

// Utility that collects real time function call performance and reliability
// metrics. The stats are computed using rolling windows of call successes,
// failures, timeouts, circuit breaker rejections and latencies.

var _ = require('underscore');
var events = require('abacus-events');

var keys = _.keys;
var filter = _.filter;
var last = _.last;
var extend = _.extend;
var reduce = _.reduce;
var map = _.map;
var find = _.find;

// Setup debug log
var debug = require('abacus-debug')('abacus-perf');

// Set up an event emitter allowing other modules to listen to accumulated call
// stats events
var emitter = events.emitter('call-metrics/emitter');
var on = function on(e, l) {
  emitter.on(e, l);
};

// Set up an event emitter used to report function call metrics
var calls = events.emitter('abacus-perf/calls');

// Report function call metrics
var report = function report(name, time, latency, err, timeout, reject, circuit) {
  var t = time || Date.now();
  var call = function call() {
    return {
      name: name,
      time: t,
      latency: latency === undefined ? Date.now() - t : latency,
      error: err || undefined,
      timeout: timeout || 0,
      reject: reject || false,
      circuit: circuit || 'closed'
    };
  };
  calls.emit('message', {
    metrics: {
      call: call()
    }
  });
};

// Convert a list of buckets to a list of buckets in a rolling time window.
// Filter out the buckets that are out of the time window, and create a new
// bucket if necessary for the given time.
var roll = function roll(buckets, time, win, max, proto) {
  var i = Math.ceil(time / (win / max));
  var current = filter(buckets, function (b) {
    return b.i > i - max;
  });
  var all = current.length !== 0 && last(current).i === i ? current : current.concat([extend({}, proto(), {
    i: i
  })]);
  return last(all, max);
};

// Return a rolling window of 10 secs of counts
var rollCounts = function rollCounts(buckets, time) {
  return roll(buckets, time, 10000, 10, function () {
    return {
      i: 0,
      ok: 0,
      errors: 0,
      timeouts: 0,
      rejects: 0
    };
  });
};

// Return a rolling window of 60 secs of latencies
var rollLatencies = function rollLatencies(buckets, time) {
  return roll(buckets, time, 60000, 6, function () {
    return {
      i: 0,
      latencies: []
    };
  });
};

// Return a rolling window of 2 secs of health reports
var rollHealth = function rollHealth(buckets, time, counts) {
  // Compute health from the given counts
  var b = reduce(counts, function (a, c) {
    return {
      ok: a.ok + c.ok,
      errors: a.errors + c.errors + c.timeouts + c.rejects
    };
  }, {
    ok: 0,
    errors: 0
  });

  // Roll the window and store the computed health in the last bucket
  var health = roll(buckets, time, 2000, 4, function () {
    return {
      i: 0,
      ok: 0,
      errors: 0
    };
  });
  extend(last(health), b);
  return health;
};

// Store accumulated function call stats per function name
// Warning: accumulatedStats is a mutable variable
var accumulatedStats = {};

// Return the accumulated stats for a function
var stats = function stats(name, time, roll) {
  var t = time || Date.now();
  var s = accumulatedStats[name] || {
    name: name,
    time: t,
    counts: [],
    latencies: [],
    health: [],
    circuit: 'closed'
  };
  /* eslint no-extra-parens: 1 */
  return roll !== false ? (function () {
    var counts = rollCounts(s.counts, t);
    return {
      name: name,
      time: t,
      counts: counts,
      latencies: rollLatencies(s.latencies, t),
      health: rollHealth(s.health, t, counts),
      circuit: s.circuit
    };
  })() : {
    name: name,
    time: t,
    counts: s.counts,
    latencies: s.latencies,
    health: s.health,
    circuit: s.circuit
  };
};

// Reset the accumulated reliability stats for a function (but keep the
// accumulated latencies)
var reset = function reset(name, time) {
  var t = time || Date.now();

  // Warning: mutating variable accumulatedStats
  /* eslint no-extra-parens: 1 */
  var astats = (function (s) {
    return s ? {
      name: name,
      time: t,
      counts: [],
      latencies: s.latencies,
      health: [],
      circuit: 'closed'
    } : {
      name: name,
      time: t,
      counts: [],
      latencies: [],
      health: [],
      circuit: 'closed'
    };
  })(accumulatedStats[name]);
  accumulatedStats[name] = astats;

  // Propagate new stats to all the listeners
  debug('Emitting stats for function %s', name);
  emitter.emit('message', {
    metrics: {
      stats: astats
    }
  });
  return astats;
};

// Return all the accumulated stats
var all = function all(time, roll) {
  var t = time || Date.now();
  return map(keys(accumulatedStats), function (k) {
    return stats(k, t, roll);
  });
};

// Process function call metrics and update accumulated call stats
var accumulateStats = function accumulateStats(name, time, latency, err, timeout, reject, circuit) {
  debug('Accumulating stats for function %s', name);
  debug('latency %d, err %s, timeout %d, reject %s, circuit %s', latency, err, timeout, reject, circuit);

  // Retrieve the current call stats for the given function
  var s = stats(name, time, false);

  // Compute up to date counts window and increment counts in the last bucket
  var counts = rollCounts(s ? s.counts : [], time);
  var updateCount = function updateCount(c) {
    c.ok = c.ok + (!err && !timeout && !reject ? 1 : 0);
    c.errors = c.errors + (err ? 1 : 0);
    c.timeouts = c.timeouts + (timeout ? 1 : 0);
    c.rejects = c.rejects + (reject ? 1 : 0);
    debug('%d ok, %d errors, %d timeouts, %d rejects, %d count buckets', c.ok, c.errors, c.timeouts, c.rejects, counts.length);
  };
  updateCount(last(counts));

  // Compute up to date latencies window and add latency to the last bucket,
  // up to the max bucket size
  var latencies = rollLatencies(s ? s.latencies : [], time);
  if (!err && !timeout && !reject) {
    var updateLatency = function updateLatency(l) {
      l.latencies = l.latencies.length < 100 ? l.latencies.concat([latency]) : l.latencies;
      debug('%d latencies, %d latencies buckets', l.latencies.length, latencies.length);
    };
    updateLatency(last(latencies));
  }

  // Compute up to date health report window
  var health = rollHealth(s ? s.health : [], time, counts);
  var h = last(health);
  debug('%d ok, %d errors, %d health buckets', h.ok, h.errors, health.length);

  // Store and return the new accumulated function call stats
  // Warning: mutating variable accumulatedStats
  var astats = {
    name: name,
    time: time,
    counts: counts,
    latencies: latencies,
    health: health,
    circuit: circuit
  };
  accumulatedStats[name] = astats;

  // Propagate new stats to all the listeners
  debug('Emitting stats for function %s', name);
  emitter.emit('message', {
    metrics: {
      stats: astats
    }
  });
  return astats;
};

// Process function call metrics messages and function call stats messages
var onMessage = function onMessage(msg) {
  if (msg.metrics) {
    debug('Received message %o', keys(msg).concat(keys(msg.metrics)));
    if (msg.metrics.call) {
      // Process call metrics and emit updated accumulated call stats
      var c = msg.metrics.call;
      accumulateStats(c.name, c.time, c.latency, c.error, c.timeout, c.reject, c.circuit);
    }
    if (msg.metrics.stats) {
      // Store latest accumulated stats
      debug('Storing stats for function %s', msg.metrics.stats.name);
      accumulatedStats[msg.metrics.stats.name] = msg.metrics.stats;
    }
  }
};

// Determine the health of the app based on the accumulated metrics
var healthy = function healthy(threshold) {

  // Go through each function call metrics
  return find(all(Date.now(), false), function (stat) {

    // Go through its health status and calculate total requests & errors
    var total = reduce(stat.health, function (a, c) {
      return {
        requests: a.requests + a.errors + c.ok + c.errors,
        errors: a.errors + c.errors
      };
    }, {
      requests: 0,
      errors: 0
    });

    var percent = 100 * (total.errors / total.requests || 1);
    debug('%s has %d% failure rate', stat.name, percent);

    // If one function call is not healthy, conclude that the app is
    // not healthy.
    return percent > (threshold || 5);
  }) ? false : true;
};

calls.on('message', onMessage);

// Export our public functions
module.exports.report = report;
module.exports.stats = stats;
module.exports.reset = reset;
module.exports.healthy = healthy;
module.exports.all = all;
module.exports.onMessage = onMessage;
module.exports.on = on;
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strict';\n\n// Utility that collects real time function call performance and reliability\n// metrics. The stats are computed using rolling windows of call successes,\n// failures, timeouts, circuit breaker rejections and latencies.\n\nconst _ = require('underscore');\nconst events = require('abacus-events');\n\nconst keys = _.keys;\nconst filter = _.filter;\nconst last = _.last;\nconst extend = _.extend;\nconst reduce = _.reduce;\nconst map = _.map;\nconst find = _.find;\n\n// Setup debug log\nconst debug = require('abacus-debug')('abacus-perf');\n\n// Set up an event emitter allowing other modules to listen to accumulated call\n// stats events\nconst emitter = events.emitter('call-metrics/emitter');\nconst on = (e, l) => {\n  emitter.on(e, l);\n};\n\n// Set up an event emitter used to report function call metrics\nconst calls = events.emitter('abacus-perf/calls');\n\n// Report function call metrics\nconst report = (name, time, latency, err, timeout, reject, circuit) => {\n  const t = time || Date.now();\n  const call = () => ({\n    name: name,\n    time: t,\n    latency: latency === undefined ? Date.now() - t : latency,\n    error: err || undefined,\n    timeout: timeout || 0,\n    reject: reject || false,\n    circuit: circuit || 'closed'\n  });\n  calls.emit('message', {\n    metrics: {\n      call: call()\n    }\n  });\n};\n\n// Convert a list of buckets to a list of buckets in a rolling time window.\n// Filter out the buckets that are out of the time window, and create a new\n// bucket if necessary for the given time.\nconst roll = (buckets, time, win, max, proto) => {\n  const i = Math.ceil(time / (win / max));\n  const current = filter(buckets, (b) => b.i > i - max);\n  const all = current.length !== 0 && last(current).i === i ? current :\n    current.concat([extend({}, proto(), {\n      i: i\n    })]);\n  return last(all, max);\n};\n\n// Return a rolling window of 10 secs of counts\nconst rollCounts = (buckets, time) => {\n  return roll(buckets, time, 10000, 10, () => ({\n    i: 0,\n    ok: 0,\n    errors: 0,\n    timeouts: 0,\n    rejects: 0\n  }));\n};\n\n// Return a rolling window of 60 secs of latencies\nconst rollLatencies = (buckets, time) => {\n  return roll(buckets, time, 60000, 6, () => ({\n    i: 0,\n    latencies: []\n  }));\n};\n\n// Return a rolling window of 2 secs of health reports\nconst rollHealth = (buckets, time, counts) => {\n  // Compute health from the given counts\n  const b = reduce(counts, (a, c) => ({\n    ok: a.ok + c.ok,\n    errors: a.errors + c.errors + c.timeouts + c.rejects\n  }), {\n    ok: 0,\n    errors: 0\n  });\n\n  // Roll the window and store the computed health in the last bucket\n  const health = roll(buckets, time, 2000, 4, () => ({\n    i: 0,\n    ok: 0,\n    errors: 0\n  }));\n  extend(last(health), b);\n  return health;\n};\n\n// Store accumulated function call stats per function name\n// Warning: accumulatedStats is a mutable variable\nlet accumulatedStats = {};\n\n// Return the accumulated stats for a function\nconst stats = (name, time, roll) => {\n  const t = time || Date.now();\n  const s = accumulatedStats[name] || {\n    name: name,\n    time: t,\n    counts: [],\n    latencies: [],\n    health: [],\n    circuit: 'closed'\n  };\n  /* eslint no-extra-parens: 1 */\n  return roll !== false ? (() => {\n    const counts = rollCounts(s.counts, t);\n    return {\n      name: name,\n      time: t,\n      counts: counts,\n      latencies: rollLatencies(s.latencies, t),\n      health: rollHealth(s.health, t, counts),\n      circuit: s.circuit\n    };\n  })() : {\n    name: name,\n    time: t,\n    counts: s.counts,\n    latencies: s.latencies,\n    health: s.health,\n    circuit: s.circuit\n  };\n};\n\n// Reset the accumulated reliability stats for a function (but keep the\n// accumulated latencies)\nconst reset = (name, time) => {\n  const t = time || Date.now();\n\n  // Warning: mutating variable accumulatedStats\n  /* eslint no-extra-parens: 1 */\n  const astats = ((s) => {\n    return s ? {\n      name: name,\n      time: t,\n      counts: [],\n      latencies: s.latencies,\n      health: [],\n      circuit: 'closed'\n    } :\n      {\n        name: name,\n        time: t,\n        counts: [],\n        latencies: [],\n        health: [],\n        circuit: 'closed'\n      };\n  })(accumulatedStats[name]);\n  accumulatedStats[name] = astats;\n\n  // Propagate new stats to all the listeners\n  debug('Emitting stats for function %s', name);\n  emitter.emit('message', {\n    metrics: {\n      stats: astats\n    }\n  });\n  return astats;\n};\n\n// Return all the accumulated stats\nconst all = (time, roll) => {\n  const t = time || Date.now();\n  return map(keys(accumulatedStats), (k) => stats(k, t, roll));\n};\n\n// Process function call metrics and update accumulated call stats\nconst accumulateStats = (name, time, latency, err, timeout,\n  reject, circuit) => {\n  debug('Accumulating stats for function %s', name);\n  debug('latency %d, err %s, timeout %d, reject %s, circuit %s',\n      latency, err, timeout, reject, circuit);\n\n    // Retrieve the current call stats for the given function\n  const s = stats(name, time, false);\n\n    // Compute up to date counts window and increment counts in the last bucket\n  const counts = rollCounts(s ? s.counts : [], time);\n  const updateCount = (c) => {\n    c.ok = c.ok + (!err && !timeout && !reject ? 1 : 0);\n    c.errors = c.errors + (err ? 1 : 0);\n    c.timeouts = c.timeouts + (timeout ? 1 : 0);\n    c.rejects = c.rejects + (reject ? 1 : 0);\n    debug('%d ok, %d errors, %d timeouts, %d rejects, %d count buckets',\n        c.ok, c.errors, c.timeouts, c.rejects, counts.length);\n  };\n  updateCount(last(counts));\n\n    // Compute up to date latencies window and add latency to the last bucket,\n    // up to the max bucket size\n  const latencies = rollLatencies(s ? s.latencies : [], time);\n  if(!err && !timeout && !reject) {\n    const updateLatency = (l) => {\n      l.latencies = l.latencies.length < 100 ?\n          l.latencies.concat([latency]) : l.latencies;\n      debug('%d latencies, %d latencies buckets',\n          l.latencies.length, latencies .length);\n    };\n    updateLatency(last(latencies));\n  }\n\n    // Compute up to date health report window\n  const health = rollHealth(s ? s.health : [], time, counts);\n  const h = last(health);\n  debug('%d ok, %d errors, %d health buckets', h.ok, h.errors, health.length);\n\n    // Store and return the new accumulated function call stats\n    // Warning: mutating variable accumulatedStats\n  const astats = {\n    name: name,\n    time: time,\n    counts: counts,\n    latencies: latencies,\n    health: health,\n    circuit: circuit\n  };\n  accumulatedStats[name] = astats;\n\n    // Propagate new stats to all the listeners\n  debug('Emitting stats for function %s', name);\n  emitter.emit('message', {\n    metrics: {\n      stats: astats\n    }\n  });\n  return astats;\n};\n\n// Process function call metrics messages and function call stats messages\nconst onMessage = (msg) => {\n  if(msg.metrics) {\n    debug('Received message %o', keys(msg).concat(keys(msg.metrics)));\n    if(msg.metrics.call) {\n      // Process call metrics and emit updated accumulated call stats\n      const c = msg.metrics.call;\n      accumulateStats(\n        c.name, c.time, c.latency, c.error, c.timeout, c.reject, c.circuit);\n    }\n    if(msg.metrics.stats) {\n      // Store latest accumulated stats\n      debug('Storing stats for function %s', msg.metrics.stats.name);\n      accumulatedStats[msg.metrics.stats.name] = msg.metrics.stats;\n    }\n  }\n};\n\n// Determine the health of the app based on the accumulated metrics\nconst healthy = (threshold) => {\n\n  // Go through each function call metrics\n  return find(all(Date.now(), false), (stat) => {\n\n    // Go through its health status and calculate total requests & errors\n    const total = reduce(stat.health, (a, c) => ({\n      requests: a.requests + a.errors + c.ok + c.errors,\n      errors: a.errors + c.errors\n    }), {\n      requests: 0,\n      errors: 0\n    });\n\n    const percent = 100 * (total.errors / total.requests || 1);\n    debug('%s has %d% failure rate', stat.name, percent);\n\n    // If one function call is not healthy, conclude that the app is\n    // not healthy.\n    return percent > (threshold || 5);\n\n  }) ? false : true;\n}\n\ncalls.on('message', onMessage);\n\n// Export our public functions\nmodule.exports.report = report;\nmodule.exports.stats = stats;\nmodule.exports.reset = reset;\nmodule.exports.healthy = healthy;\nmodule.exports.all = all;\nmodule.exports.onMessage = onMessage;\nmodule.exports.on = on;\n"]}