k3s/pkg/agent/loadbalancer/servers.go

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package loadbalancer
import (
"errors"
"math/rand"
"reflect"
)
func (lb *LoadBalancer) setServers(serverAddresses []string) bool {
serverAddresses, hasOriginalServer := sortServers(serverAddresses, lb.defaultServerAddress)
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if len(serverAddresses) == 0 {
return false
}
lb.mutex.Lock()
defer lb.mutex.Unlock()
if reflect.DeepEqual(serverAddresses, lb.ServerAddresses) {
return false
}
lb.ServerAddresses = serverAddresses
lb.randomServers = append([]string{}, lb.ServerAddresses...)
rand.Shuffle(len(lb.randomServers), func(i, j int) {
lb.randomServers[i], lb.randomServers[j] = lb.randomServers[j], lb.randomServers[i]
})
if !hasOriginalServer {
lb.randomServers = append(lb.randomServers, lb.defaultServerAddress)
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}
lb.currentServerAddress = lb.randomServers[0]
lb.nextServerIndex = 1
return true
}
func (lb *LoadBalancer) nextServer(failedServer string) (string, error) {
lb.mutex.Lock()
defer lb.mutex.Unlock()
if len(lb.randomServers) == 0 {
return "", errors.New("No servers in load balancer proxy list")
}
if len(lb.randomServers) == 1 {
return lb.currentServerAddress, nil
}
if failedServer != lb.currentServerAddress {
return lb.currentServerAddress, nil
}
if lb.nextServerIndex >= len(lb.randomServers) {
lb.nextServerIndex = 0
}
lb.currentServerAddress = lb.randomServers[lb.nextServerIndex]
lb.nextServerIndex++
return lb.currentServerAddress, nil
}