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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package self_disc
import (
"github.com/RoaringBitmap/roaring"
)
import (
"github.com/apache/dubbo-go/cluster/router"
"github.com/apache/dubbo-go/cluster/router/utils"
"github.com/apache/dubbo-go/common"
"github.com/apache/dubbo-go/common/logger"
"github.com/apache/dubbo-go/protocol"
)
const (
HEALTH_ROUTE_ENABLED_KEY = "health.route.enabled"
selfDesc = "self-desc"
name = "health-check-router"
)
// SelfDiscRouter provides a health-first routing mechanism through HealthChecker
type SelfDiscRouter struct {
url *common.URL
localIP string
}
// NewSelfDiscRouter construct an HealthCheckRouter via url
func NewSelfDiscRouter(url *common.URL) (router.PriorityRouter, error) {
r := &SelfDiscRouter{
url: url,
localIP: url.Ip,
}
return r, nil
}
// Route gets a list of healthy invoker
func (r *SelfDiscRouter) Route(invokers *roaring.Bitmap, cache router.Cache, url *common.URL, invocation protocol.Invocation) *roaring.Bitmap {
addrPool := cache.FindAddrPool(r)
// Add healthy invoker to the list
selectedInvokers := utils.JoinIfNotEqual(addrPool[selfDesc], invokers)
// If all invokers are considered unhealthy, downgrade to all invoker
if selectedInvokers.IsEmpty() {
logger.Warnf(" Now all invokers are not match, so downgraded to all! Service: [%s]", url.ServiceKey())
return invokers
}
return selectedInvokers
}
// Pool separates healthy invokers from others.
func (r *SelfDiscRouter) Pool(invokers []protocol.Invoker) (router.AddrPool, router.AddrMetadata) {
rb := make(router.AddrPool, 8)
rb[selfDesc] = roaring.NewBitmap()
selfDescFound := false
logger.Debug("local ip = ", r.localIP)
for i, invoker := range invokers {
if invoker.GetUrl().Ip == r.localIP {
rb[selfDesc].Add(uint32(i))
selfDescFound = true
}
}
if selfDescFound {
// found self desc
logger.Debug("found self desc ")
return rb, nil
}
for i, _ := range invokers {
rb[selfDesc].Add(uint32(i))
}
return rb, nil
}
// ShouldPool will always return true to make sure healthy check constantly.
func (r *SelfDiscRouter) ShouldPool() bool {
return true
}
func (r *SelfDiscRouter) Name() string {
return name
}
// Priority
func (r *SelfDiscRouter) Priority() int64 {
return 0
}
// URL Return URL in router
func (r *SelfDiscRouter) URL() *common.URL {
return r.url
}