go imap: 错误的序列集值 “”

huangapple
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英文:

go imap: bad sequence set value ""

问题

我正在尝试按照IMAP示例进行操作，但是我遇到了这个错误imap: bad sequence set value ""，对应于示例中的set, _ := imap.NewSeqSet("")这一行。这是库中的一个错误还是文档中的一个拼写错误？

我试图获取所有的消息，所以将序列设置为通配符（*）似乎也不起作用。我还尝试阅读RFC，但收效甚微。关于序列值，我只找到了以下内容：

  1. seq-number      = nz-number / "*"
  2.                     ; 消息序列号（COPY、FETCH、STORE命令）或唯一标识符（UID COPY、UID FETCH、UID STORE命令）。
  3.                     ; * 表示正在使用的最大数字。对于消息序列号，它是非空邮箱中的消息数量。
  4.                     ; 对于唯一标识符，它是邮箱中最后一条消息的唯一标识符，或者如果邮箱为空，则是邮箱的当前 UIDNEXT 值。
  5.                     ; 如果命令使用大于所选邮箱中的消息数量的消息序列号，服务器应该以标记为 BAD 的响应进行响应。如果所选邮箱为空，则包括“*”。
  7. seq-range       = seq-number ":" seq-number
  8.                     ; 两个 seq-number 值及其之间的所有值，无论顺序如何。
  9.                     ; 示例：2:4 和 4:2 是等价的，表示值 2、3 和 4。
  10.                     ; 示例：3291:* 的唯一标识符序列范围包括邮箱中最后一条消息的 UID，即使该值小于 3291。
  12. sequence-set    = (seq-number / seq-range) *("," sequence-set)
  13.                     ; 无论顺序如何，seq-number 值的集合。
  14.                     ; 服务器可以合并重叠并/或以任何顺序执行序列。
  15.                     ; 示例：对于具有 15 条消息的邮箱，消息序列号集合 2,4:7,9,12:* 等价于 2,4,5,6,7,9,12,13,14,15。
  16.                     ; 示例：对于具有 10 条消息的邮箱，消息序列号集合 *:4,5:7 等价于 10,9,8,7,6,5,4,5,6,7，并且可以重新排序和合并重叠为 4,5,6,7,8,9,10。
  18. status          = "STATUS" SP mailbox SP
  19.                   "(" status-att *(SP status-att) ")"
英文:

I'm trying to follow the IMAP example but I get this error imap: bad sequence set value "" which corresponds with the line set, _ := imap.NewSeqSet("") from the example. Is it a bug in the lib or a typo in the documentation ?

I'm trying to fetch all the messages so setting the sequence to wildcard ( * ) doesn't seem to work either. I've also tried to read RFC with little success. All I could find about the sequence values is this

  1. seq-number      = nz-number / "*"
  2.                     ; message sequence number (COPY, FETCH, STORE
  3.                     ; commands) or unique identifier (UID COPY,
  4.                     ; UID FETCH, UID STORE commands).
  5.                     ; * represents the largest number in use.  In
  6.                     ; the case of message sequence numbers, it is
  7.                     ; the number of messages in a non-empty mailbox.
  8.                     ; In the case of unique identifiers, it is the
  9.                     ; unique identifier of the last message in the
  10.                     ; mailbox or, if the mailbox is empty, the
  11.                     ; mailbox's current UIDNEXT value.
  12.                     ; The server should respond with a tagged BAD
  13.                     ; response to a command that uses a message
  14.                     ; sequence number greater than the number of
  15.                     ; messages in the selected mailbox.  This
  16.                     ; includes "*" if the selected mailbox is empty.
  18. seq-range       = seq-number ":" seq-number
  19.                     ; two seq-number values and all values between
  20.                     ; these two regardless of order.
  21.                     ; Example: 2:4 and 4:2 are equivalent and indicate
  22.                     ; values 2, 3, and 4.
  23.                     ; Example: a unique identifier sequence range of
  24.                     ; 3291:* includes the UID of the last message in
  25.                     ; the mailbox, even if that value is less than 3291.
  27. sequence-set    = (seq-number / seq-range) *("," sequence-set)
  28.                     ; set of seq-number values, regardless of order.
  29.                     ; Servers MAY coalesce overlaps and/or execute the
  30.                     ; sequence in any order.
  31.                     ; Example: a message sequence number set of
  32.                     ; 2,4:7,9,12:* for a mailbox with 15 messages is
  33.                     ; equivalent to 2,4,5,6,7,9,12,13,14,15
  34.                     ; Example: a message sequence number set of *:4,5:7
  35.                     ; for a mailbox with 10 messages is equivalent to
  36.                     ; 10,9,8,7,6,5,4,5,6,7 and MAY be reordered and
  37.                     ; overlap coalesced to be 4,5,6,7,8,9,10.
  39. status          = "STATUS" SP mailbox SP
  40.                   "(" status-att *(SP status-att) ")"

答案1

得分: 2

以下是你要翻译的内容：

这是你要复制的代码。

// 获取最近10条消息的头部
set, _ := imap.NewSeqSet("")
if c.Mailbox.Messages >= 10 {
set.AddRange(c.Mailbox.Messages-9, c.Mailbox.Messages)
} else {
set.Add("1:*")
}
cmd, _ = c.Fetch(set, "RFC822.HEADER")

该代码将一个变量设置为""，但从未使用该值。它使用另一个值，该值取决于c.Mailbox对象的状态。

这里的教训是，仅仅复制文档中的一行代码是不够的，你需要看看周围的代码。

英文:

Here's the code you're copying from.

  1. // Fetch the headers of the 10 most recent messages
  2. set, _ := imap.NewSeqSet("")
  3. if c.Mailbox.Messages >= 10 {
  4.     set.AddRange(c.Mailbox.Messages-9, c.Mailbox.Messages)
  5. } else {
  6.     set.Add("1:*")
  7. }
  8. cmd, _ = c.Fetch(set, "RFC822.HEADER")

That code sets a variable to "" but never uses that value. It uses another value, which depends on the state of the c.Mailbox object.

The lesson here is that copying a single line from the documentation isn't enough, you need to look at the surroundings.

答案2

得分: -1

似乎在 Go 文档中有一个拼写错误。set, err := imap.NewSeqSet("1:*") 修复了这个问题。

英文:

It seems there is a typo in the Go doc. set, err := imap.NewSeqSet("1:*") fixes the issue.

huangapple
  • 本文由 发表于 2014年7月22日 16:07:23
  • 转载请务必保留本文链接：https://go.coder-hub.com/24881981.html
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