-
Notifications
You must be signed in to change notification settings - Fork 15
/
filter.go
76 lines (63 loc) · 1.81 KB
/
filter.go
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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
package enginenetx
// filterOutNilTactics filters out nil tactics.
//
// This function returns a channel where we emit the edited
// tactics, and which we clone when we're done.
func filterOutNilTactics(input <-chan *httpsDialerTactic) <-chan *httpsDialerTactic {
output := make(chan *httpsDialerTactic)
go func() {
defer close(output)
for tx := range input {
if tx != nil {
output <- tx
}
}
}()
return output
}
// filterOnlyKeepUniqueTactics only keeps unique tactics.
//
// This function returns a channel where we emit the edited
// tactics, and which we clone when we're done.
func filterOnlyKeepUniqueTactics(input <-chan *httpsDialerTactic) <-chan *httpsDialerTactic {
output := make(chan *httpsDialerTactic)
go func() {
// make sure we close output chan
defer close(output)
// useful to make sure we don't emit two equal policy in a single run
uniq := make(map[string]int)
for tx := range input {
// handle the case in which we already emitted a tactic
key := tx.tacticSummaryKey()
if uniq[key] > 0 {
continue
}
uniq[key]++
// emit the tactic
output <- tx
}
}()
return output
}
// filterAssignInitialDelays assigns initial delays to tactics.
//
// This function returns a channel where we emit the edited
// tactics, and which we clone when we're done.
func filterAssignInitialDelays(input <-chan *httpsDialerTactic) <-chan *httpsDialerTactic {
output := make(chan *httpsDialerTactic)
go func() {
// make sure we close output chan
defer close(output)
index := 0
for tx := range input {
// TODO(bassosimone): what do we do now about the user configured
// initial delays? Should we declare them as deprecated?
// rewrite the delays
tx.InitialDelay = happyEyeballsDelay(index)
index++
// emit the tactic
output <- tx
}
}()
return output
}