dubbo.apache.org/dubbo-go/v3@v3.1.1/cluster/loadbalance/util.go (about)

     1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   * contributor license agreements.  See the NOTICE file distributed with
     4   * this work for additional information regarding copyright ownership.
     5   * The ASF licenses this file to You under the Apache License, Version 2.0
     6   * (the "License"); you may not use this file except in compliance with
     7   * the License.  You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  package loadbalance
    19  
    20  import (
    21  	"time"
    22  )
    23  
    24  import (
    25  	"dubbo.apache.org/dubbo-go/v3/common/constant"
    26  	"dubbo.apache.org/dubbo-go/v3/protocol"
    27  )
    28  
    29  // GetWeight gets weight for load balance strategy
    30  func GetWeight(invoker protocol.Invoker, invocation protocol.Invocation) int64 {
    31  	var weight int64
    32  	url := invoker.GetURL()
    33  	// Multiple registry scenario, load balance among multiple registries.
    34  	isRegIvk := url.GetParamBool(constant.RegistryKey+"."+constant.RegistryLabelKey, false)
    35  	if isRegIvk {
    36  		weight = url.GetParamInt(constant.RegistryKey+"."+constant.WeightKey, constant.DefaultWeight)
    37  	} else {
    38  		weight = url.GetMethodParamInt64(invocation.MethodName(), constant.WeightKey, constant.DefaultWeight)
    39  
    40  		if weight > 0 {
    41  			// get service register time an do warm up time
    42  			now := time.Now().Unix()
    43  			timestamp := url.GetParamInt(constant.RemoteTimestampKey, now)
    44  			if uptime := now - timestamp; uptime > 0 {
    45  				warmup := url.GetParamInt(constant.WarmupKey, constant.DefaultWarmup)
    46  				if uptime < warmup {
    47  					if ww := float64(uptime) / float64(warmup) / float64(weight); ww < 1 {
    48  						weight = 1
    49  					} else if int64(ww) <= weight {
    50  						weight = int64(ww)
    51  					}
    52  				}
    53  			}
    54  		}
    55  	}
    56  
    57  	if weight < 0 {
    58  		weight = 0
    59  	}
    60  
    61  	return weight
    62  }