nack.go

   1 //
   2 // Copyright © 2011-2018 Guy M. Allard
   3 //
   4 // Licensed under the Apache License, Version 2.0 (the "License");
   5 // you may not use this file except in compliance with the License.
   6 // You may obtain a copy of the License at
   7 //
   8 //     http://www.apache.org/licenses/LICENSE-2.0
   9 //
  10 // Unless required by applicable law or agreed to in writing, software
  11 // distributed under the License is distributed on an "AS IS" BASIS,
  12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 // See the License for the specific language governing permissions and
  14 // limitations under the License.
  15 //
  16
  17 package stompngo
  18
  19 import (
  20         "fmt"
  21 )
  22
  23 var _ = fmt.Println
  24
  25 /*
  26         Nack a STOMP 1.1+ message.
  27
  28         For Stomp 1.1 Headers must contain a "message-id" key and a "subscription"
  29         header key.
  30
  31
  32         For Stomp 1.2 Headers must contain a unique "id" header key.
  33
  34
  35         See the specifications at http://stomp.github.com/ for details.
  36
  37
  38         Disallowed for an established STOMP 1.0 connection, and EBADVERNAK is returned.
  39
  40         Example:
  41                 h := stompngo.Headers{stompngo.HK_MESSAGE_ID, "message-id1",
  42                         stompngo.HK_SUBSCRIPTION, "d2cbe608b70a54c8e69d951b246999fbc20df694"}
  43                 e := c.Nack(h)
  44                 if e != nil {
  45                         // Do something sane ...
  46                 }
  47
  48 */
  49 func (c *Connection) Nack(h Headers) error {
  50         c.log(NACK, "start", h, c.Protocol())
  51         if !c.connected {
  52                 return ECONBAD
  53         }
  54         if c.Protocol() == SPL_10 {
  55                 return EBADVERNAK
  56         }
  57         e := checkHeaders(h, c.Protocol())
  58         if e != nil {
  59                 return e
  60         }
  61
  62         switch c.Protocol() {
  63         case SPL_12:
  64                 if _, ok := h.Contains(HK_ID); !ok {
  65                         return EREQIDNAK
  66                 }
  67         default: // SPL_11
  68                 if _, ok := h.Contains(HK_SUBSCRIPTION); !ok {
  69                         return EREQSUBNAK
  70                 }
  71                 if _, ok := h.Contains(HK_MESSAGE_ID); !ok {
  72                         return EREQMIDNAK
  73                 }
  74         }
  75
  76         e = c.transmitCommon(NACK, h) // transmitCommon Clones() the headers
  77         c.log(NACK, "end", h, c.Protocol())
  78         return e
  79 }