daddy/internal/voter/strategy.go

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package voter
import "context"
// StrategyUnanimous returns Allow if all voters allow the operations.
func StrategyUnanimous(ctx context.Context, decisions []Decision) (Decision, error) {
allAbstains := true
for _, d := range decisions {
if d == Deny {
return Deny, nil
}
if d != Abstain {
allAbstains = false
}
}
if allAbstains {
return Abstain, nil
}
return Allow, nil
}
// StrategyAffirmative returns Allow if at least one voter allow the operation.
func StrategyAffirmative(ctx context.Context, decisions []Decision) (Decision, error) {
allAbstains := true
for _, d := range decisions {
if d == Allow {
return Allow, nil
}
if allAbstains && d != Abstain {
allAbstains = false
}
}
if allAbstains {
return Abstain, nil
}
return Deny, nil
}
// StrategyConsensus returns Allow if the majority of voters allow the operation.
func StrategyConsensus(ctx context.Context, decisions []Decision) (Decision, error) {
deny := 0
allow := 0
abstain := 0
for _, d := range decisions {
switch {
case d == Allow:
allow++
case d == Deny:
deny++
case d == Abstain:
abstain++
}
}
if abstain > allow && abstain > deny {
return Abstain, nil
}
if allow > abstain && allow > deny {
return Allow, nil
}
if deny > allow && deny > abstain {
return Deny, nil
}
return Abstain, nil
}