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9f9e75f508
1) imported glog to third_party (previous commit) 2) add support for third_party/update.sh to update just one pkg 3) search-and-replace: s/log.Printf/glog.Infof/ s/log.Print/glog.Info/ s/log.Fatalf/glog.Fatalf/ s/log.Fatal/glog.Fatal/ 4) convert glog.Info.*, err into glog.Error* Adds some util interfaces to logging and calls them from each cmd, which will set the default log output to write to glog. Pass glog-wrapped Loggers to etcd for logging. Log files will go to /tmp - we should probably follow this up with a default log dir for each cmd. The glog lib is sort of weak in that it only flushes every 30 seconds, so we spin up our own flushing goroutine.
105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// RoundRobin Loadbalancer
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package proxy
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import (
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"errors"
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"net"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/golang/glog"
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)
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type LoadBalancerRR struct {
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lock sync.RWMutex
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endpointsMap map[string][]string
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rrIndex map[string]int
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}
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func NewLoadBalancerRR() *LoadBalancerRR {
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return &LoadBalancerRR{endpointsMap: make(map[string][]string), rrIndex: make(map[string]int)}
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}
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func (impl LoadBalancerRR) LoadBalance(service string, srcAddr net.Addr) (string, error) {
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impl.lock.RLock()
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endpoints, exists := impl.endpointsMap[service]
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index := impl.rrIndex[service]
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impl.lock.RUnlock()
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if exists == false {
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return "", errors.New("no service entry for:" + service)
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}
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if len(endpoints) == 0 {
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return "", errors.New("no endpoints for: " + service)
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}
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endpoint := endpoints[index]
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impl.rrIndex[service] = (index + 1) % len(endpoints)
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return endpoint, nil
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}
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func (impl LoadBalancerRR) IsValid(spec string) bool {
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index := strings.Index(spec, ":")
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if index == -1 {
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return false
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}
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value, err := strconv.Atoi(spec[index+1:])
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if err != nil {
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return false
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}
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return value > 0
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}
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func (impl LoadBalancerRR) FilterValidEndpoints(endpoints []string) []string {
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var result []string
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for _, spec := range endpoints {
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if impl.IsValid(spec) {
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result = append(result, spec)
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}
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}
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return result
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}
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func (impl LoadBalancerRR) OnUpdate(endpoints []api.Endpoints) {
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tmp := make(map[string]bool)
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impl.lock.Lock()
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defer impl.lock.Unlock()
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// First update / add all new endpoints for services.
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for _, value := range endpoints {
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existingEndpoints, exists := impl.endpointsMap[value.Name]
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if !exists || !reflect.DeepEqual(value.Endpoints, existingEndpoints) {
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glog.Infof("LoadBalancerRR: Setting endpoints for %s to %+v", value.Name, value.Endpoints)
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impl.endpointsMap[value.Name] = impl.FilterValidEndpoints(value.Endpoints)
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// Start RR from the beginning if added or updated.
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impl.rrIndex[value.Name] = 0
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}
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tmp[value.Name] = true
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}
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// Then remove any endpoints no longer relevant
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for key, value := range impl.endpointsMap {
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_, exists := tmp[key]
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if !exists {
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glog.Infof("LoadBalancerRR: Removing endpoints for %s -> %+v", key, value)
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delete(impl.endpointsMap, key)
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}
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}
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}
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