Ruby IMAP自上次检查后“更改”

目前,我将UID和UID有效值存储在数据库中,进行比较,并进行适当的搜索.这有效,但它不会检测已删除的消息或对消息标志的更改等.

我是否必须每次都提取所有消息以检测这些更改？其他IMAP客户如何快速完成(即Apple Mail和Postbox).我的脚本每个帐户已经花了10秒钟,只有很少的电子邮件地址：

# select ourself as the current mailbox
@imap_connection.examine(self.location)

# grab all new messages and update them in the database
# if the uid's are still valid,we will just fetch the newest UIDs
# otherwise,we need to search when we last synced,which is slower :(
if self.uid_validity.nil? || uid_validity == self.uid_validity
  # for some IMAP servers,if a mailbox is empty,a uid_fetch will fail,so then
  begin
    messages = @imap_connection.uid_fetch(uid_range,['UID','RFC822','FLAGS'])
  rescue
    # gmail cries if the folder is empty
    uids = @imap_connection.uid_search(['ALL'])
    messages = @imap_connection.uid_fetch(uids,'FLAGS']) unless uids.empty?
  end

  messages.each do |imap_message|
    Message.create_from_imap!(imap_message,self.id)
  end unless messages.nil?
else
  query = self.last_synced.nil? ? ['All'] : ['SINCE',Net::IMAP.format_datetime(self.last_synced)]
  @imap_connection.search(query).each do |message_id|
    imap_message = @imap_connection.fetch(message_id,['RFC822','FLAGS','UID'])[0]

    # don't mark the messages as read
    #@imap_connection.store(message_id,'-FLAGS',[:Seen])

    Message.create_from_imap!(imap_message,self.id)
  end
end

# now assume all UIDs are valid
self.uid_validity = uid_validity

# now remember that we just fetched all those messages
self.last_synced = Time.now
self.save!