collector.js

const fs = require("fs")

var Collector = function () {
  var self = this
  self.metrics = {}
  self.baseNative = 0.0
  self.baseWasm = 0.0

  self.FormatMs = function (fl) {
    return (fl / 1000000.0).toFixed(2)
  }

  self.FormatPc = function (fl) {
    return (fl > 0 ? "+" : "") + (fl * 100).toFixed(2) + "%"
  }

  self.CollectBaseCriterionWasmNative = async function (baseDir) {
    var masterNativeStats = await self.loadStats(
      baseDir + "/Native/base/estimates.json",
    )
    var masterWasmStats = await self.loadStats(
      baseDir + "/Wasm/base/estimates.json",
    )

    self.baseWasm = masterWasmStats.Median.point_estimate
    self.baseNative = masterNativeStats.Median.point_estimate

    self.metrics["Master: Wasm"] = `${self.FormatMs(
      self.baseWasm,
    )} ms (+/- ${self.FormatMs(masterWasmStats.Median.standard_error)} ms)`
    self.metrics["Master: Native"] = `${self.FormatMs(
      self.baseNative,
    )} ms (+/- ${self.FormatMs(masterNativeStats.Median.standard_error)} ms)`
  }

  self.CollectBranchCriterionWasmNative = async function (baseDir) {
    var branchNativeStats = await self.loadStats(
      baseDir + "/Native/new/estimates.json",
    )
    var branchWasmStats = await self.loadStats(
      baseDir + "/Wasm/new/estimates.json",
    )

    var branchWasm = branchWasmStats.Median.point_estimate
    var branchNative = branchNativeStats.Median.point_estimate

    self.metrics["Branch: Wasm"] = `${self.FormatMs(
      branchWasm,
    )} ms (+/- ${self.FormatMs(branchWasmStats.Median.standard_error)} ms)`
    self.metrics["Branch: Native"] = `${self.FormatMs(
      branchNative,
    )} ms (+/- ${self.FormatMs(branchNativeStats.Median.standard_error)} ms)`

    var changeWasm = (branchWasm - self.baseWasm) / self.baseWasm
    var changeNative = (branchNative - self.baseNative) / self.baseNative

    self.metrics["Change: Wasm"] = self.FormatPc(changeWasm)
    self.metrics["Change: Native"] = self.FormatPc(changeNative)
  }

  self.CollectBaseCustomRunner = async function (stdout) {
    self.baseNative = JSON.parse(stdout)[0]["average"]
    self.metrics["Master"] = `${self.FormatMs(self.baseNative)} ms`
  }

  self.CollectBranchCustomRunner = async function (stdout) {
    self.branchNative = JSON.parse(stdout)[0]["average"]
    var change = (self.branchNative - self.baseNative) / self.baseNative
    self.metrics["Branch"] = `${self.FormatMs(self.branchNative)} ms`
    self.metrics["Change"] = self.FormatPc(change)
  }

  self.loadStats = async function (path) {
    var buffer = fs.readFileSync(path)
    return JSON.parse(buffer)
  }

  self.Report = async function () {
    var report = ""
    for (metric in self.metrics) {
      report = report + "\n" + `${metric}: ${self.metrics[metric]}`
    }
    return report
  }
}

module.exports.Collector = Collector