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Last change
on this file since 781 was 735, checked in by contact, 4 years ago |
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Add exponential backoff when re-connecting to upstream
The first reconnection attempt waits for 1min, the second the 2min,
and so on up to 10min. There's a 1min jitter so that multiple failed
connections don't try to reconnect at the exact same time.
Closes: https://todo.sr.ht/~emersion/soju/161
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File size:
603 bytes
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| 1 | package soju
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| 2 |
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| 3 | import (
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| 4 | "math/rand"
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| 5 | "time"
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| 6 | )
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| 7 |
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| 8 | // backoffer implements a simple exponential backoff.
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| 9 | type backoffer struct {
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| 10 | min, max, jitter time.Duration
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| 11 | n int64
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| 12 | }
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| 13 |
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| 14 | func newBackoffer(min, max, jitter time.Duration) *backoffer {
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| 15 | return &backoffer{min: min, max: max, jitter: jitter}
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| 16 | }
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| 17 |
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| 18 | func (b *backoffer) Reset() {
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| 19 | b.n = 0
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| 20 | }
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| 21 |
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| 22 | func (b *backoffer) Next() time.Duration {
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| 23 | if b.n == 0 {
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| 24 | b.n = 1
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| 25 | return 0
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| 26 | }
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| 27 |
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| 28 | d := time.Duration(b.n) * b.min
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| 29 | if d > b.max {
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| 30 | d = b.max
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| 31 | } else {
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| 32 | b.n *= 2
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| 33 | }
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| 34 |
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| 35 | if b.jitter != 0 {
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| 36 | d += time.Duration(rand.Int63n(int64(b.jitter)))
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| 37 | }
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| 38 |
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| 39 | return d
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| 40 | }
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