dubbo.apache.org/dubbo-go/v3@v3.1.1/xds/balancer/ringhash/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  /*
    19   *
    20   * Copyright 2021 gRPC authors.
    21   *
    22   */
    23  
    24  package ringhash
    25  
    26  import (
    27  	"context"
    28  )
    29  
    30  type clusterKey struct{}
    31  
    32  func getRequestHash(ctx context.Context) uint64 {
    33  	requestHash, _ := ctx.Value(clusterKey{}).(uint64)
    34  	return requestHash
    35  }
    36  
    37  // GetRequestHashForTesting returns the request hash in the context; to be used
    38  // for testing only.
    39  func GetRequestHashForTesting(ctx context.Context) uint64 {
    40  	return getRequestHash(ctx)
    41  }
    42  
    43  // SetRequestHash adds the request hash to the context for use in Ring Hash Load
    44  // Balancing.
    45  func SetRequestHash(ctx context.Context, requestHash uint64) context.Context {
    46  	return context.WithValue(ctx, clusterKey{}, requestHash)
    47  }