/
rate_limit_generators.go
42 lines (34 loc) · 1.05 KB
/
rate_limit_generators.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
package bitswap
import (
"math/rand"
)
type fixedRateLimitGenerator struct {
rateLimit float64
}
// FixedRateLimitGenerator returns a rate limit generatoe that always generates
// the specified rate limit in bytes/sec.
func FixedRateLimitGenerator(rateLimit float64) RateLimitGenerator {
return &fixedRateLimitGenerator{rateLimit}
}
func (rateLimitGenerator *fixedRateLimitGenerator) NextRateLimit() float64 {
return rateLimitGenerator.rateLimit
}
type variableRateLimitGenerator struct {
rateLimit float64
std float64
rng *rand.Rand
}
// VariableRateLimitGenerator makes rate limites that following a normal distribution.
func VariableRateLimitGenerator(rateLimit float64, std float64, rng *rand.Rand) RateLimitGenerator {
if rng == nil {
rng = sharedRNG
}
return &variableRateLimitGenerator{
std: std,
rng: rng,
rateLimit: rateLimit,
}
}
func (rateLimitGenerator *variableRateLimitGenerator) NextRateLimit() float64 {
return rateLimitGenerator.rng.NormFloat64()*rateLimitGenerator.std + rateLimitGenerator.rateLimit
}