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18 lines
645 B
Go
18 lines
645 B
Go
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package cluster
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import "github.com/dchest/siphash"
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// computes the target member using siphash and returns the index and the member
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// siphash was chosen to prevent against hash attacks where an attacker
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// can target all requests to one given instance instead of balancing across the cluster
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// resulting in a Denial-of-Service (DOS).
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// ref: https://en.wikipedia.org/wiki/SipHash
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func ComputeTargetMember(hashKey string, members []string, repoName string) (uint64, string) {
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h := siphash.New([]byte(hashKey))
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h.Write([]byte(repoName))
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sum64 := h.Sum64()
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targetIdx := sum64 % uint64(len(members))
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return targetIdx, members[targetIdx]
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}
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