ack.go

   1 //
   2 // Copyright © 2011-2017 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 /*
  20         Ack a STOMP MESSAGE.
  21
  22         For Stomp 1.0 Headers MUST contain a "message-id" header key.
  23
  24
  25         For Stomp 1.1   Headers must contain a "message-id" key and a "subscription"
  26         header key.
  27
  28
  29         For Stomp 1.2 Headers must contain a unique "id" header key.
  30
  31         See the specifications at http://stomp.github.com/ for details.
  32
  33         Example:
  34                 h := stompngo.Headers{stompngo.HK_MESSAGE_ID, "message-id1",
  35                         "subscription", "d2cbe608b70a54c8e69d951b246999fbc20df694"}
  36                 e := c.Ack(h)
  37                 if e != nil {
  38                         // Do something sane ...
  39                 }
  40
  41 */
  42 func (c *Connection) Ack(h Headers) error {
  43         c.log(ACK, "start", h, c.Protocol())
  44         if !c.connected {
  45                 return ECONBAD
  46         }
  47         e := checkHeaders(h, c.Protocol())
  48         if e != nil {
  49                 return e
  50         }
  51         switch c.Protocol() {
  52         case SPL_12:
  53                 if _, ok := h.Contains(HK_ID); !ok {
  54                         return EREQIDACK
  55                 }
  56         case SPL_11:
  57                 if _, ok := h.Contains(HK_SUBSCRIPTION); !ok {
  58                         return EREQSUBACK
  59                 }
  60                 if _, ok := h.Contains(HK_MESSAGE_ID); !ok {
  61                         return EREQMIDACK
  62                 }
  63         default: // SPL_10
  64                 if _, ok := h.Contains(HK_MESSAGE_ID); !ok {
  65                         return EREQMIDACK
  66                 }
  67         }
  68
  69         e = c.transmitCommon(ACK, h) // transmitCommon Clones() the headers
  70         c.log(ACK, "end", h, c.Protocol())
  71         return e
  72 }