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consul/agent/xds/failover_math.go

39 lines
931 B

package xds
import (
envoy_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
"github.com/hashicorp/consul/agent/structs"
)
func firstHealthyTarget(
targets map[string]*structs.DiscoveryTarget,
targetHealth map[string]structs.CheckServiceNodes,
primaryTarget string,
secondaryTargets []string,
) string {
series := make([]string, 0, len(secondaryTargets)+1)
series = append(series, primaryTarget)
series = append(series, secondaryTargets...)
for _, targetID := range series {
target, ok := targets[targetID]
if !ok {
continue
}
endpoints, ok := targetHealth[targetID]
if !ok {
continue
}
for _, ep := range endpoints {
healthStatus, _ := calculateEndpointHealthAndWeight(ep, target.Subset.OnlyPassing)
if healthStatus == envoy_core_v3.HealthStatus_HEALTHY {
return targetID
}
}
}
return primaryTarget // if everything is broken just use the primary for now
}