From af37210c0bd7bf343fe366ddd2b253e2214f5547 Mon Sep 17 00:00:00 2001
From: Josh Morel <morel.josh@hotmail.com>
Date: Sat, 15 Dec 2018 08:51:51 -0500
Subject: throw error if MailDev doesn't run

also allow calling in multiple file
---
 shared/utils/miscs/email-child-process.js | 27 +++++++++++++
 shared/utils/miscs/email.ts               | 66 ++++++++++++++++++++++---------
 2 files changed, 75 insertions(+), 18 deletions(-)
 create mode 100644 shared/utils/miscs/email-child-process.js

(limited to 'shared/utils')

diff --git a/shared/utils/miscs/email-child-process.js b/shared/utils/miscs/email-child-process.js
new file mode 100644
index 000000000..40ae37d70
--- /dev/null
+++ b/shared/utils/miscs/email-child-process.js
@@ -0,0 +1,27 @@
+const MailDev = require('maildev')
+
+// must run maildev as forked ChildProcess
+// failed instantiation stops main process with exit code 0
+process.on('message', (msg) => {
+  if (msg.start) {
+    const maildev = new MailDev({
+      ip: '127.0.0.1',
+      smtp: 1025,
+      disableWeb: true,
+      silent: true
+    })
+
+    maildev.on('new', email => {
+      process.send({ email })
+    })
+
+    maildev.listen(err => {
+      if (err) {
+        // cannot send as Error object
+        return process.send({ err: err.message })
+      }
+
+      return process.send({ err: null })
+    })
+  }
+})
diff --git a/shared/utils/miscs/email.ts b/shared/utils/miscs/email.ts
index 21accd09d..108f7d3d9 100644
--- a/shared/utils/miscs/email.ts
+++ b/shared/utils/miscs/email.ts
@@ -1,25 +1,55 @@
-import * as MailDev from 'maildev'
-
-function mockSmtpServer (emailsCollection: object[]) {
-  const maildev = new MailDev({
-    ip: '127.0.0.1',
-    smtp: 1025,
-    disableWeb: true,
-    silent: true
-  })
-  maildev.on('new', email => emailsCollection.push(email))
-
-  return new Promise((res, rej) => {
-    maildev.listen(err => {
-      if (err) return rej(err)
-
-      return res()
+import * as child from 'child_process'
+
+class MockSmtpServer {
+
+  private static instance: MockSmtpServer
+  private started = false
+  private emailChildProcess: child.ChildProcess
+  private emails: object[]
+
+  private constructor () {
+    this.emailChildProcess = child.fork(`${__dirname}/email-child-process`, [], { silent: true })
+    this.emailChildProcess.on('message', (msg) => {
+      if (msg.email) {
+        return this.emails.push(msg.email)
+      }
+    })
+    process.on('exit', () => {
+      this.emailChildProcess.kill()
     })
-  })
+  }
+
+  collectEmails (emailsCollection: object[]) {
+    return new Promise((res, rej) => {
+      if (this.started) {
+        this.emails = emailsCollection
+        return res()
+      }
+
+      // ensure maildev isn't started until
+      // unexpected exit can be reported to test runner
+      this.emailChildProcess.send({ start: true })
+      this.emailChildProcess.on('exit', () => {
+        return rej(new Error('maildev exited unexpectedly, confirm port not in use'))
+      })
+      this.emailChildProcess.on('message', (msg) => {
+        if (msg.err) {
+          return rej(new Error(msg.err))
+        }
+        this.started = true
+        this.emails = emailsCollection
+        return res()
+      })
+    })
+  }
+
+  static get Instance () {
+    return this.instance || (this.instance = new this())
+  }
 }
 
 // ---------------------------------------------------------------------------
 
 export {
-  mockSmtpServer
+  MockSmtpServer
 }
-- 
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