/
sendq.go
122 lines (108 loc) · 2.55 KB
/
sendq.go
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// Copyright 2020-2023 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"strconv"
"sync"
)
type outMsg struct {
subj string
rply string
hdr []byte
msg []byte
}
type sendq struct {
mu sync.Mutex
q *ipQueue[*outMsg]
s *Server
}
func (s *Server) newSendQ() *sendq {
sq := &sendq{s: s, q: newIPQueue[*outMsg](s, "SendQ")}
s.startGoRoutine(sq.internalLoop)
return sq
}
func (sq *sendq) internalLoop() {
sq.mu.Lock()
s, q := sq.s, sq.q
sq.mu.Unlock()
defer s.grWG.Done()
c := s.createInternalSystemClient()
c.registerWithAccount(s.SystemAccount())
c.noIcb = true
defer c.closeConnection(ClientClosed)
// To optimize for not converting a string to a []byte slice.
var (
subj [256]byte
rply [256]byte
szb [10]byte
hdb [10]byte
)
for s.isRunning() {
select {
case <-s.quitCh:
return
case <-q.ch:
pms := q.pop()
for _, pm := range pms {
c.pa.subject = append(subj[:0], pm.subj...)
c.pa.size = len(pm.msg) + len(pm.hdr)
c.pa.szb = append(szb[:0], strconv.Itoa(c.pa.size)...)
if len(pm.rply) > 0 {
c.pa.reply = append(rply[:0], pm.rply...)
} else {
c.pa.reply = nil
}
var msg []byte
if len(pm.hdr) > 0 {
c.pa.hdr = len(pm.hdr)
c.pa.hdb = append(hdb[:0], strconv.Itoa(c.pa.hdr)...)
msg = append(pm.hdr, pm.msg...)
msg = append(msg, _CRLF_...)
} else {
c.pa.hdr = -1
c.pa.hdb = nil
msg = append(pm.msg, _CRLF_...)
}
c.processInboundClientMsg(msg)
c.pa.szb = nil
outMsgPool.Put(pm)
}
// TODO: should this be in the for-loop instead?
c.flushClients(0)
q.recycle(&pms)
}
}
}
var outMsgPool = sync.Pool{
New: func() any {
return &outMsg{}
},
}
func (sq *sendq) send(subj, rply string, hdr, msg []byte) {
if sq == nil {
return
}
out := outMsgPool.Get().(*outMsg)
out.subj, out.rply = subj, rply
out.hdr, out.msg = nil, nil
// We will copy these for now.
if len(hdr) > 0 {
hdr = copyBytes(hdr)
out.hdr = hdr
}
if len(msg) > 0 {
msg = copyBytes(msg)
out.msg = msg
}
sq.q.push(out)
}