From 2512ade6b4d0560972e09cf667885816f5ebab9d Mon Sep 17 00:00:00 2001
From: VG <vg@devys.org>
Date: Mon, 9 May 2016 15:40:01 +0200
Subject: Auto-commit on 6d1dbe8495b5fafbc5f50d80268d0ca5b7b097be

---
 climl/imap.py | 82 ++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 61 insertions(+), 21 deletions(-)

diff --git a/climl/imap.py b/climl/imap.py
index bd5b3ff..783b228 100644
--- a/climl/imap.py
+++ b/climl/imap.py
@@ -62,6 +62,50 @@ def connect_to_imap(conf, password):
     finally:
         connection.shutdown()
 
+
+def imap_waiter(connection):
+    '''
+        from dovecot wiki:
+        > If IDLE command is started, Dovecot never
+        > disconnects. Only if the connection is lost there will be
+        > a disconnection. A dead connection is detected by Dovecot
+        > periodically sending "I'm still here" notifications to
+        > client (imap_idle_notify_interval setting - default every
+        > 2 minutes).
+        >
+        > IMAP clients are supposed to send something before 30
+        > minutes are up, but several clients don't do this. Some
+        > Outlook versions even stop receiving new mails entirely
+        > until manual intervention if IMAP server disconnects the
+        > client.
+
+        We are a compliant client. To be compatible with a lot of servers
+        (general assumption is a 29minutes timeout), we try to redo idle-mode
+        every 24 minutes. Each call to imap_waiter is a single idle iteration.
+        Thus this function may return empty list.
+    '''
+    print('entering idle mode...')
+    connection.idle()
+    print('waiting for an event')
+    try:
+        while True:
+            events = connection.idle_check(timeout=24*60)
+            if len(events) == 1 and \
+                    str(bytes(events[0][0]), encoding='ascii') == 'OK':
+                # in case of dovecot 'Ok still here' keepalives, timeout did
+                # not expired (and never will appart from a disconnection)
+                continue
+            else:
+                break
+    except KeyboardInterrupt:
+        print('quitting idle mode on interrupt.')
+        connection.idle_done()
+        raise
+    print('quitting idle mode...')
+    connection.idle_done()
+    return [i for i in events if str(bytes(i[0]), encoding='ascii') != 'OK']
+
+
 def main(callback=None):
     assert callback
     confpath = os.path.expanduser('~/.config/climl/climl.cfg')
@@ -72,24 +116,20 @@ def main(callback=None):
         password = subprocess.check_output(password_command, shell=True)
         password = password.rstrip().decode('utf8')
         print('got pasword:', password)
-
-    #connection = connect_to_imap(conf, password)
-    with connect_to_imap(conf, password) as connection:
-        print('selecting folder')
-        connection.select_folder(conf.get('imap.mailbox'))
-        print('entering idle mode')
-        connection.idle()
-        print('waiting for an event')
-        while True:
-            try:
-                result = connection.idle_check(timeout=10)
-            except KeyboardInterrupt:
-                break
-            print('result:', result)
-            print('calling callback')
-            if result:
-                callback('mail')
-    print('end of connection')
-
-
-#main() # dev mode for now
+    while True:
+        print('connection...')
+        try:
+            with connect_to_imap(conf, password) as connection:
+                print('selecting folder', conf.get('imap.mailbox'))
+                connection.select_folder(conf.get('imap.mailbox'))
+                while True:
+                    events = imap_waiter(connection)
+                    if events:
+                        print('events:', events)
+                        print('calling callback')
+                        callback('mail')
+        except (socket.error, socket.timeout):
+            pass
+        except KeyboardInterrupt:
+            break
+        print('end of connection')
-- 
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