From 9863e78cc9e80661f03b4332754f9f1bd026b5fd Mon Sep 17 00:00:00 2001
From: Daniel Weipert <code@drogueronin.de>
Date: Wed, 23 Jun 2021 19:09:03 +0200
Subject: Refactors migration and enhances tests

---
 app/imap.js  | 30 ++++++++++++++++--------------
 test/test.js | 39 ++++++++++++++++++++++++++-------------
 2 files changed, 42 insertions(+), 27 deletions(-)

diff --git a/app/imap.js b/app/imap.js
index f2e8cc2..181d9cf 100644
--- a/app/imap.js
+++ b/app/imap.js
@@ -20,6 +20,16 @@ async function connect (options) {
   return client;
 }
 
+ImapFlow.prototype.fetchArray = async function (range, query, options = {}) {
+  const msgsGenerator = await this.fetch(range, query, options);
+  const msgs = [];
+  for await (const msg of msgsGenerator) {
+    msgs.push(msg);
+  }
+
+  return msgs;
+};
+
 async function listTreeFrom (event, options) {
   const client = await connect(options);
 
@@ -47,26 +57,18 @@ async function migrate (event, { from, to }) {
     const fromMailbox = await fromClient.getMailboxLock(fromFolder.path);
     const toMailbox = await toClient.getMailboxLock(fromFolder.path);
     try {
-      const toMsgsGenerator = await toClient.fetch('1:*', { flags: true, envelope: true, source: true });
-      const toMsgs = [];
-      for await (const toMsg of toMsgsGenerator) {
-        toMsgs.push(toMsg);
-      }
-      const fromMsgsGenerator = await fromClient.fetch('1:*', { flags: true, envelope: true, source: true });
+      const toMsgs = await toClient.fetchArray('1:*', { flags: true, envelope: true, source: true });
+      const fromMsgs = await fromClient.fetchArray('1:*', { flags: true, envelope: true, source: true });
 
-      for await (const fromMsg of fromMsgsGenerator) {
-        if (toMsgs.some((toMsg) => Buffer.compare(toMsg.source, fromMsg.source) === 0)) {
-          continue;
-        }
+      const msgs = fromMsgs.filter((fromMsg) => !toMsgs.some((toMsg) => Buffer.compare(toMsg.source, fromMsg.source) === 0));
 
-        await toClient.append(fromFolder.path, fromMsg.source, Array.from(fromMsg.flags), fromMsg.envelope.date);
+      await toClient.noop();
+      for (const msg of msgs) {
+        toClient.append(fromFolder.path, msg.source, Array.from(msg.flags), msg.envelope.date);
       }
     } finally {
       fromMailbox.release();
       toMailbox.release();
     }
   }
-
-  await fromClient.logout();
-  await toClient.logout();
 }
diff --git a/test/test.js b/test/test.js
index dad4b9f..eab0ca0 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,6 +1,6 @@
 const { ImapFlow } = require('imapflow');
 
-const clientFrom = new ImapFlow({
+const fromClient = new ImapFlow({
   host: 'localhost',
   port: 3143,
   auth: {
@@ -9,7 +9,7 @@ const clientFrom = new ImapFlow({
   },
 });
 
-const clientTo = new ImapFlow({
+const toClient = new ImapFlow({
   host: 'localhost',
   port: 31432,
   auth: {
@@ -19,12 +19,13 @@ const clientTo = new ImapFlow({
 });
 
 (async () => {
-  await clientFrom.connect();
-  await clientTo.connect();
+  await fromClient.connect();
+  await toClient.connect();
 
   const fromMailboxes = [
     'From Test Parent.From Test Child',
     'From Test Parent.From Test Child 2.From Test Child Inner',
+    '10000 Mails',
   ];
   const toMailboxes = [
     'To Test Parent.To Test Child',
@@ -32,51 +33,63 @@ const clientTo = new ImapFlow({
   ];
   for (const mailbox of fromMailboxes) {
     try {
-      await clientFrom.mailboxDelete(mailbox);
+      await fromClient.mailboxDelete(mailbox);
     } catch (e) {}
     try {
-      await clientTo.mailboxDelete(mailbox);
+      await toClient.mailboxDelete(mailbox);
     } catch (e) {}
 
     try {
-      await clientFrom.mailboxCreate(mailbox);
+      await fromClient.mailboxCreate(mailbox);
     } catch (e) {}
   }
   for (const mailbox of toMailboxes) {
     try {
-      await clientTo.mailboxDelete(mailbox);
+      await toClient.mailboxDelete(mailbox);
     } catch (e) {}
 
     try {
-      await clientTo.mailboxCreate(mailbox);
+      await toClient.mailboxCreate(mailbox);
     } catch (e) {}
   }
 
-  await clientFrom.append('INBOX',
+  fromClient.append('INBOX',
     'From: test@example.org\r\n' +
     'To: from@example.org\r\n' +
     'Subject: FROM INBOX MESSAGE SUBJECT\r\n' +
     '\r\n' +
     'FROM INBOX MESSAGE BODY', [], new Date());
 
-  await clientFrom.append('From Test Parent.From Test Child',
+  fromClient.append('From Test Parent.From Test Child',
     'From: test@example.org\r\n' +
     'To: from@example.org\r\n' +
     'Subject: FROM TEST CHILD MESSAGE FLAGGED SUBJECT\r\n' +
     '\r\n' +
     'FROM TEST CHILD MESSAGE FLAGGED BODY', ['\\FLAGGED'], new Date());
 
-  await clientFrom.append('From Test Parent.From Test Child',
+  fromClient.append('From Test Parent.From Test Child',
     'From: test@example.org\r\n' +
     'To: from@example.org\r\n' +
     'Subject: FROM TEST CHILD MESSAGE DRAFT SUBJECT\r\n' +
     '\r\n' +
     'FROM TEST CHILD MESSAGE DRAFT BODY', ['\\DRAFT'], new Date());
 
-  await clientFrom.append('From Test Parent.From Test Child 2.From Test Child Inner',
+  fromClient.append('From Test Parent.From Test Child 2.From Test Child Inner',
     'From: test@example.org\r\n' +
     'To: from@example.org\r\n' +
     'Subject: FROM TEST CHILD 2 INNER MESSAGE SEEN SUBJECT\r\n' +
     '\r\n' +
     'FROM TEST CHILD 2 INNER MESSAGE SEEN BODY', ['\\SEEN'], new Date());
+
+  for (let i = 0; i < 10000; i++) {
+    const flag = ['\\SEEN', '\\FLAGGED', ''][Math.floor(Math.random() * 3)];
+    const now = new Date();
+
+    fromClient.append('10000 Mails',
+      'From: test@example.org\r\n' +
+      'To: from@example.org\r\n' +
+      `Subject: ${i}. MAIL\r\n` +
+      '\r\n' +
+      `MANY MAILS NUMBER ${i}`, [flag], new Date(now.getTime() - i * 60000));
+  }
 })();
-- 
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