23 lines
886 B
Go
23 lines
886 B
Go
package vaa
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// CalculateQuorum returns the minimum number of guardians that need to sign a VAA for a given guardian set.
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//
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// The canonical source is the calculation in the contracts (solana/bridge/src/processor.rs and
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// ethereum/contracts/Wormhole.sol), and this needs to match the implementation in the contracts.
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func CalculateQuorum(numGuardians int) int {
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// A safety check to avoid caller from ever supplying a negative
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// number, because we're dealing with signed integers
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if numGuardians < 0 {
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panic("Invalid numGuardians is less than zero")
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}
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// The goal here is to achieve a 2/3 quorum, but since we're
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// dividing on int, we need to +1 to avoid the rounding down
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// effect of integer division
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//
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// For example sake, 5 / 2 == 2, but really that's not an
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// effective 2/3 quorum, so we add 1 for safety to get to 3
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//
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return ((numGuardians * 2) / 3) + 1
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}
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