1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
package main
import "time"
// This value is sent to the transceiver and - according to my observations - it will use
// this as it's RX buf length. Note that if it is set to larger than 500-600ms then audio TX
// won't work (small radio memory?)
const txSeqBufLength = 300 * time.Millisecond
type txSeqBufEntry struct {
seq seqNum
data []byte
addedAt time.Time
}
type txSeqBufStruct struct {
entries []txSeqBufEntry
}
func (s *txSeqBufStruct) add(seq seqNum, p []byte) {
s.entries = append(s.entries, txSeqBufEntry{
seq: seq,
data: p,
addedAt: time.Now(),
})
s.purgeOldEntries()
}
func (s *txSeqBufStruct) purgeOldEntries() {
// We keep much more entries than the specified length of the TX seqbuf, so we can serve
// any requests coming from the server.
for len(s.entries) > 0 && time.Since(s.entries[0].addedAt) > txSeqBufLength*10 {
s.entries = s.entries[1:]
}
}
func (s *txSeqBufStruct) get(seq seqNum) (d []byte) {
if len(s.entries) == 0 {
return nil
}
// Searching from backwards, as we expect most queries for latest entries.
for i := len(s.entries) - 1; i >= 0; i-- {
if s.entries[i].seq == seq {
d = make([]byte, len(s.entries[i].data))
copy(d, s.entries[i].data)
break
}
}
s.purgeOldEntries()
return d
}
|
