From 026e8a17ca40955652949584388b38566fef66e7 Mon Sep 17 00:00:00 2001
From: Drew DeVault <sir@cmpwn.com>
Date: Mon, 13 May 2019 20:16:55 -0400
Subject: Handle incoming emails gracefully

---
 worker/imap/open.go   |  3 +++
 worker/imap/worker.go | 23 ++++++++++++++++++++---
 2 files changed, 23 insertions(+), 3 deletions(-)

(limited to 'worker/imap')

diff --git a/worker/imap/open.go b/worker/imap/open.go
index dc5d6d1..ab54e88 100644
--- a/worker/imap/open.go
+++ b/worker/imap/open.go
@@ -17,6 +17,9 @@ func (imapw *IMAPWorker) handleOpenDirectory(msg *types.OpenDirectory) {
 		}, nil)
 	} else {
 		imapw.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil)
+		if imapw.idleStop == nil {
+			imapw.idleStop = make(chan struct{})
+		}
 	}
 }
 
diff --git a/worker/imap/worker.go b/worker/imap/worker.go
index 4354ab9..3d4555f 100644
--- a/worker/imap/worker.go
+++ b/worker/imap/worker.go
@@ -18,7 +18,7 @@ var errUnsupported = fmt.Errorf("unsupported command")
 
 type imapClient struct {
 	*client.Client
-	*idle.IdleClient
+	idle *idle.IdleClient
 }
 
 type IMAPWorker struct {
@@ -30,6 +30,8 @@ type IMAPWorker struct {
 	}
 
 	client   *imapClient
+	idleStop chan struct{}
+	idleDone chan error
 	selected imap.MailboxStatus
 	updates  chan client.Update
 	worker   *types.Worker
@@ -39,8 +41,9 @@ type IMAPWorker struct {
 
 func NewIMAPWorker(worker *types.Worker) *IMAPWorker {
 	return &IMAPWorker{
-		updates: make(chan client.Update, 50),
-		worker:  worker,
+		idleDone: make(chan error),
+		updates:  make(chan client.Update, 50),
+		worker:   worker,
 	}
 }
 
@@ -80,6 +83,13 @@ func (w *IMAPWorker) verifyPeerCert(msg types.WorkerMessage) func(
 }
 
 func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
+	if w.idleStop != nil {
+		close(w.idleStop)
+		if err := <-w.idleDone; err != nil {
+			w.worker.PostMessage(&types.Error{Error: err}, nil)
+		}
+	}
+
 	switch msg := msg.(type) {
 	case *types.Unsupported:
 		// No-op
@@ -167,6 +177,13 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
 	default:
 		return errUnsupported
 	}
+
+	if w.idleStop != nil {
+		w.idleStop = make(chan struct{})
+		go func() {
+			w.idleDone <- w.client.idle.IdleWithFallback(w.idleStop, 0)
+		}()
+	}
 	return nil
 }
 
-- 
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