blob: b1247cbb8074c2ebc9f507aad731b85a01889b23 (
plain)
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
|
// Eko: A terminal-native social media platform
// Copyright (C) 2025 Kyren223
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package rate
import "time"
type Limiter struct {
limit float64
rate float64
lastRefill time.Time
tokens float64
}
// rate refills limiter rate tokens per second
func NewLimiter(rate float64, limit float64) Limiter {
return Limiter{
limit: limit,
rate: rate,
lastRefill: time.Now().UTC(),
tokens: limit,
}
}
func (rl *Limiter) Fill() {
rl.update()
rl.tokens = rl.limit
}
func (rl *Limiter) SetRate(rate float64) {
rl.update()
rl.rate = rate
}
func (rl *Limiter) SetLimit(limit float64) {
rl.update()
rl.limit = limit
}
func (rl *Limiter) Take(tokens float64) bool {
rl.update()
has := rl.Has(tokens)
if has {
rl.tokens -= tokens
return true
}
return false
}
func (rl *Limiter) Has(tokens float64) bool {
rl.update()
return rl.tokens >= tokens
}
func (rl *Limiter) update() {
lastRefill := rl.lastRefill
rl.lastRefill = time.Now().UTC()
rl.tokens += min(time.Since(lastRefill).Seconds()*rl.rate, rl.limit)
}
|
