Ruby IMAP的“更改"自上次检查以来 [英] Ruby IMAP "changes" since last check

问题描述

我正在使用Ruby和Rails开发IMAP客户端.我可以成功导入邮件，邮箱等...但是，在首次导入后，如何检测自上次同步以来发生的任何更改?

I'm working on an IMAP client using Ruby and Rails. I can successfully import messages, mailboxes, and more... However, after the initial import, how can I detect any changes that have occurred since my last sync?

当前，我正在将UID和UID有效性值存储在数据库中，对其进行比较，并进行适当的搜索.可以，但是不能检测到已删除的邮件或邮件标志的更改等.

Currently I am storing the UIDs and UID validity values in the database, comparing them, and searching appropriately. This works, but it doesn't detect deleted messages or changes to message flags, etc.

我是否必须每次都拉出所有消息才能检测到这些更改?其他IMAP客户端如何快速完成操作(即Apple Mail和Postbox).我的脚本每个帐户已经花了10秒钟以上的时间，电子邮件地址很少:

Do I have to pull all messages every time to detect these changes? How do other IMAP clients do it so quickly (i.e. Apple Mail and Postbox). My script is already taking 10+ seconds per account with very few email addresses:

# 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, ['UID', 'RFC822', '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!

推荐答案

对于快速标记更改重新同步(

There is an IMAP extension for Quick Flag Changes Resynchronization (RFC-4551). With this extension it is possible to search for all messages that have been changed since the last synchronization (based on some kind of timestamp). However, as far as I know this extension is not widely supported.

有一个参考性RFC，描述了IMAP客户端应如何进行同步( RFC-4549 ，第4.3节).文本建议发出以下两个命令:

There is an informational RFC that describes how IMAP clients should do synchronization (RFC-4549, section 4.3). The text recommends issuing the following two commands:

tag1 UID FETCH <lastseenuid+1>:* <descriptors>
tag2 UID FETCH 1:<lastseenuid> FLAGS

第一个命令用于获取所有未知邮件的必需信息(不知道有多少邮件).第二个命令用于同步已经看到的邮件的标志.

The first command is used to fetch the required information for all unknown mails (without knowing how many mails there are). The second command is used to synchronize the flags for the already seen mails.

AFAIK这种方法被广泛使用.因此，许多IMAP服务器都包含优化，以便快速提供此信息.通常，网络带宽是限制因素.

AFAIK this method is widely used. Therefore, many IMAP servers contain optimizations in order to provide this information quickly. Typically, the network bandwidth is the limiting factor.

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