fix: synchronous blocking calls

test/stress/child.js

@@ -1,6 +1,7 @@
 const https = require('https')
 const path = require('path')
-const fs = require('fs')
+const pify = require('pify')
+const fs = pify(require('fs'))
 const uuid = require('uuid')
 const _ = require('lodash/fp')
 const { PerformanceObserver, performance } = require('perf_hooks')
@@ -8,23 +9,23 @@ const { PerformanceObserver, performance } = require('perf_hooks')
 const utils = require('./utils')
 const variables = require('./utils/variables')
 
-function getCert (machineIndex) {
+var certificate = {}
-  try {
+var connectionInfo = {}
-    return {
+
-      key: fs.readFileSync(path.resolve(__dirname, 'machines', `${machineIndex}`, 'client.key')),
+async function getCert (machineIndex) {
-      cert: fs.readFileSync(path.resolve(__dirname, 'machines', `${machineIndex}`, 'client.pem'))
+  const key = fs.readFile(path.resolve(__dirname, 'machines', `${machineIndex}`, 'client.key'))
-    }
+  const cert = fs.readFile(path.resolve(__dirname, 'machines', `${machineIndex}`, 'client.pem'))
-  } catch (e) {
+
+  return Promise.all([key, cert]).then(values => {
+    return { key: values[0], cert: values[1] }
+  }).catch(err => {
+    console.err('The following error when reading the certificate: ', err)
     return null
-  }
+  })
 }
 
-function connectionInfo (machineIndex) {
+async function getConnectionInfo (machineIndex) {
-  try {
+  return fs.readFile(path.resolve(__dirname, 'machines', `${machineIndex}`, 'connection_info.json'))
-    return JSON.parse(fs.readFileSync(path.resolve(__dirname, 'machines', `${machineIndex}`, 'connection_info.json')))
-  } catch (e) {
-    return null
-  }
 }
 
 let counter = 0
@@ -38,9 +39,9 @@ function request (machineIndex, pid) {
     port: 3000,
     path: '/poll?state=chooseCoin&model=unknown&version=7.5.0-beta.0&idle=true&pid=' + pid + '&sn=' + counter,
     method: 'GET',
-    key: getCert(machineIndex).key,
+    key: certificate.key,
-    cert: getCert(machineIndex).cert,
+    cert: certificate.cert,
-    ca: connectionInfo(machineIndex).ca,
+    ca: connectionInfo.ca,
     headers: {
       date: new Date().toISOString(),
       'request-id': uuid.v4()
@@ -67,6 +68,14 @@ obs.observe({ entryTypes: ['measure'] })
 process.on('message', async (msg) => {
   console.log('Message from parent:', msg)
 
+  const promises = [getCert(msg.machineIndex), getConnectionInfo(msg.machineIndex)]
+  Promise.all(promises).then(values => {
+    certificate = values[0]
+    connectionInfo = JSON.parse(values[1])
+  }).catch(err => {
+    console.err('The following error occurred during certificate parsing: ', err)
+  })
+
   if (msg.hasVariance) await new Promise(resolve => setTimeout(resolve, utils.randomIntFromInterval(1, variables.POLLING_INTERVAL)))
   const pid = uuid.v4()
   request(msg.machineIndex, pid)