Fixed issue #2321 - IMAP fetch stops because of request timeout

app/models/channel/driver/imap.rb

@@ -94,33 +94,41 @@ example
     Rails.logger.info "fetching imap (#{options[:host]}/#{options[:user]} port=#{port},ssl=#{ssl},starttls=#{starttls},folder=#{folder},keep_on_server=#{keep_on_server})"
 
     # on check, reduce open_timeout to have faster probing
-    timeout = 45
+    @timeout = 45
     if check_type == 'check'
-      timeout = 6
+      @timeout = 6
     end
 
-    Timeout.timeout(timeout) do
+    timeout do
       @imap = ::Net::IMAP.new(options[:host], port, ssl, nil, false)
       if starttls
         @imap.starttls()
       end
     end
 
+    timeout do
       @imap.login(options[:user], options[:password])
+    end
 
+    timeout do
       # select folder
       @imap.select(folder)
+    end
 
     # sort messages by date on server (if not supported), if not fetch messages via search (first in, first out)
     filter = ['ALL']
     if keep_on_server && check_type != 'check' && check_type != 'verify'
       filter = %w[NOT SEEN]
     end
+
+    message_ids = nil
+    timeout do
       begin
         message_ids = @imap.sort(['DATE'], filter, 'US-ASCII')
       rescue
         message_ids = @imap.search(filter)
       end
+    end
 
     # check mode only
     if check_type == 'check'
@@ -131,7 +139,10 @@ example
       # check messages
       message_ids.each do |message_id|
 
+        message_meta = nil
+        timeout do
           message_meta = @imap.fetch(message_id, ['RFC822.HEADER'])[0].attr
+        end
 
         # check how many content messages we have, for notice used
         header = message_meta['RFC822.HEADER']
@@ -158,7 +169,10 @@ example
       # check for verify message
       message_ids.each do |message_id|
 
+        message_meta = nil
+        timeout do
           message_meta = @imap.fetch(message_id, ['ENVELOPE'])[0].attr
+        end
 
         # check if verify message exists
         subject = message_meta['ENVELOPE'].subject
@@ -166,8 +180,10 @@ example
         next if subject !~ /#{verify_string}/
 
         Rails.logger.info " - verify email #{verify_string} found"
+        timeout do
           @imap.store(message_id, '+FLAGS', [:Deleted])
           @imap.expunge()
+        end
         disconnect
         return {
           result: 'ok',
@@ -189,7 +205,10 @@ example
       count += 1
       Rails.logger.info " - message #{count}/#{count_all}"
 
+      message_meta = nil
+      timeout do
         message_meta = @imap.fetch(message_id, ['RFC822.SIZE', 'ENVELOPE', 'FLAGS', 'INTERNALDATE'])[0]
+      end
 
       # ignore to big messages
       info = too_big?(message_meta, count, count_all)
@@ -205,20 +224,29 @@ example
       next if already_imported?(message_id, message_meta, count, count_all, keep_on_server, channel)
 
       # delete email from server after article was created
+      msg = nil
+      timeout do
         msg = @imap.fetch(message_id, 'RFC822')[0].attr['RFC822']
+      end
       next if !msg
 
       process(channel, msg, false)
+
+      timeout do
         if !keep_on_server
           @imap.store(message_id, '+FLAGS', [:Deleted])
         else
           @imap.store(message_id, '+FLAGS', [:Seen])
         end
+      end
       count_fetched += 1
     end
+
     if !keep_on_server
+      timeout do
         @imap.expunge()
       end
+    end
     disconnect
     if count.zero?
       Rails.logger.info ' - no message'
@@ -234,8 +262,10 @@ example
   def disconnect
     return if !@imap
 
+    timeout do
       @imap.disconnect()
     end
+  end
 
 =begin
 
@@ -273,7 +303,9 @@ returns
       return false if ticket.preferences[:channel_id] != channel[:id]
     end
 
+    timeout do
       @imap.store(message_id, '+FLAGS', [:Seen])
+    end
     Rails.logger.info "  - ignore message #{count}/#{count_all} - because message message id already imported"
     true
   end
@@ -296,4 +328,10 @@ returns
     false
   end
 
+  def timeout
+    Timeout.timeout(@timeout) do
+      yield
+    end
+  end
+
 end