add hw2

node_modules/pino/test/helper.js

@@ -0,0 +1,128 @@
+'use strict'
+
+const crypto = require('crypto')
+const os = require('os')
+const writer = require('flush-write-stream')
+const split = require('split2')
+const { existsSync, readFileSync, statSync, unlinkSync } = require('fs')
+const pid = process.pid
+const hostname = os.hostname()
+const t = require('tap')
+const { join } = require('path')
+const { tmpdir } = os
+
+const isWin = process.platform === 'win32'
+const isYarnPnp = process.versions.pnp !== undefined
+
+function getPathToNull () {
+  return isWin ? '\\\\.\\NUL' : '/dev/null'
+}
+
+function once (emitter, name) {
+  return new Promise((resolve, reject) => {
+    if (name !== 'error') emitter.once('error', reject)
+    emitter.once(name, (...args) => {
+      emitter.removeListener('error', reject)
+      resolve(...args)
+    })
+  })
+}
+
+function sink (func) {
+  const result = split((data) => {
+    try {
+      return JSON.parse(data)
+    } catch (err) {
+      console.log(err)
+      console.log(data)
+    }
+  })
+  if (func) result.pipe(writer.obj(func))
+  return result
+}
+
+function check (is, chunk, level, msg) {
+  is(new Date(chunk.time) <= new Date(), true, 'time is greater than Date.now()')
+  delete chunk.time
+  is(chunk.pid, pid)
+  is(chunk.hostname, hostname)
+  is(chunk.level, level)
+  is(chunk.msg, msg)
+}
+
+function sleep (ms) {
+  return new Promise((resolve) => {
+    setTimeout(resolve, ms)
+  })
+}
+
+function watchFileCreated (filename) {
+  return new Promise((resolve, reject) => {
+    const TIMEOUT = process.env.PINO_TEST_WAIT_WATCHFILE_TIMEOUT || 10000
+    const INTERVAL = 100
+    const threshold = TIMEOUT / INTERVAL
+    let counter = 0
+    const interval = setInterval(() => {
+      const exists = existsSync(filename)
+      // On some CI runs file is created but not filled
+      if (exists && statSync(filename).size !== 0) {
+        clearInterval(interval)
+        resolve()
+      } else if (counter <= threshold) {
+        counter++
+      } else {
+        clearInterval(interval)
+        reject(new Error(
+          `${filename} hasn't been created within ${TIMEOUT} ms. ` +
+          (exists ? 'File exist, but still empty.' : 'File not yet created.')
+        ))
+      }
+    }, INTERVAL)
+  })
+}
+
+function watchForWrite (filename, testString) {
+  return new Promise((resolve, reject) => {
+    const TIMEOUT = process.env.PINO_TEST_WAIT_WRITE_TIMEOUT || 10000
+    const INTERVAL = 100
+    const threshold = TIMEOUT / INTERVAL
+    let counter = 0
+    const interval = setInterval(() => {
+      if (readFileSync(filename).includes(testString)) {
+        clearInterval(interval)
+        resolve()
+      } else if (counter <= threshold) {
+        counter++
+      } else {
+        clearInterval(interval)
+        reject(new Error(`'${testString}' hasn't been written to ${filename} within ${TIMEOUT} ms.`))
+      }
+    }, INTERVAL)
+  })
+}
+
+let files = []
+
+function file () {
+  const hash = crypto.randomBytes(12).toString('hex')
+  const file = join(tmpdir(), `pino-${pid}-${hash}`)
+  files.push(file)
+  return file
+}
+
+process.on('beforeExit', () => {
+  if (files.length === 0) return
+  t.comment('unlink files')
+  for (const file of files) {
+    try {
+      t.comment(`unliking ${file}`)
+      unlinkSync(file)
+    } catch (e) {
+      console.log(e)
+    }
+  }
+  files = []
+  t.comment('unlink completed')
+})
+
+module.exports = { getPathToNull, sink, check, once, sleep, watchFileCreated, watchForWrite, isWin, isYarnPnp, file }