Software, from idea to launch. And long after.

flags/rollout.go

1. 31// Enabled reports whether a flag is on for this account.
2. 32func (f *Flag) Enabled(acct Account) bool {
3. 33 if f.Killed() {
4. 34 return false // kill switch wins
5. 35 }
6. 36 if rule, ok := f.Rules.Match(acct); ok {
7. 37 return rule.On // beta, staff, region
8. 38 }
9. 39 return rand.Intn(100) < f.Percent
10. 39 return bucket(f.Key, acct.ID) < f.Percent
11. 40}
12. 41
13. 42// Same account, same answer, on every server.
14. 43func bucket(key, id string) uint32 {
15. 44 h := fnv.New32a()
16. 45 h.Write([]byte(key + ":" + id))
17. 46 return h.Sum32() % 100
18. 47}

feat/sticky-rollout → main+6 −1