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ringhash.go
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ringhash.go
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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 ringhash
import (
"strconv"
)
import (
"github.com/dubbogo/gost/log/logger"
)
import (
"dubbo.apache.org/dubbo-go/v3/cluster/loadbalance"
"dubbo.apache.org/dubbo-go/v3/common"
"dubbo.apache.org/dubbo-go/v3/common/constant"
"dubbo.apache.org/dubbo-go/v3/common/extension"
"dubbo.apache.org/dubbo-go/v3/protocol"
"dubbo.apache.org/dubbo-go/v3/remoting/xds"
)
func init() {
extension.SetLoadbalance(constant.LoadXDSRingHash, newRingHashLoadBalance)
}
type invokerWrapper struct {
invoker protocol.Invoker
weight int
}
type ringhashLoadBalance struct {
client xds.XDSWrapperClient
}
// newRingHashLoadBalance xds ring hash
//
// The same parameters of the request is always sent to the same provider.
func newRingHashLoadBalance() loadbalance.LoadBalance {
return &ringhashLoadBalance{client: xds.GetXDSWrappedClient()}
}
// Select gets invoker based on load balancing strategy
func (lb *ringhashLoadBalance) Select(invokers []protocol.Invoker, invocation protocol.Invocation) protocol.Invoker {
url := invocation.Invoker().GetURL()
serviceUniqueKey := common.GetSubscribeName(url)
hostAddr, err := lb.client.GetHostAddrByServiceUniqueKey(serviceUniqueKey)
if err != nil {
logger.Errorf("[xds ringhash] GetHostAddrByServiceUniqueKey failed,error=%v", err)
return nil
}
clusterUpdate := lb.client.GetClusterUpdateIgnoreVersion(hostAddr)
policy := clusterUpdate.LBPolicy
if policy.MaximumRingSize < policy.MinimumRingSize {
logger.Errorf("[xds ringhash] ringsize parameter is invalid. MinimumRingSize=%d,MaximumRingSize=%d", policy.MaximumRingSize, policy.MaximumRingSize)
return nil
}
invokerWrappers := make([]invokerWrapper, 0, len(invokers))
for _, v := range invokers {
weight, _ := strconv.Atoi(v.GetURL().GetParam(constant.EndPointWeight, "1"))
invokerWrappers = append(invokerWrappers, invokerWrapper{invoker: v, weight: weight})
}
ring, err := lb.generateRing(invokerWrappers, policy.MinimumRingSize, policy.MaximumRingSize)
if err != nil {
logger.Errorf("[xds ringhash] ringsize parameter is invalid. MinimumRingSize=%d,MaximumRingSize=%d", policy.MaximumRingSize, policy.MaximumRingSize)
return nil
}
routerConfig := lb.client.GetRouterConfig(hostAddr)
router, err := lb.client.MatchRoute(routerConfig, invocation)
if err != nil {
logger.Errorf("[xds ringhash] not found route,method=%s", invocation.MethodName())
return nil
}
return lb.pick(lb.generateHash(invocation, router.HashPolicies), ring).invoker
}