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ringhash: make endpoint hash key configurable, and set it from EDS
Implement part 2 of A76: the ability to specify the location of endpoints on the ring, and a default implementation based on EDS metadata that matches Envoy behavior.
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/* | ||
* | ||
* Copyright 2024 gRPC authors. | ||
* | ||
* Licensed 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. | ||
* | ||
*/ | ||
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// Package ringhash implements resolver related functions for the ring_hash | ||
// load balancing policy. | ||
package ringhash | ||
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import ( | ||
"google.golang.org/grpc/resolver" | ||
) | ||
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// hashKeyKey is the key to store the ring hash key attribute in | ||
// resolver.Address attribute. | ||
const hashKeyKey = hashKeyType("hash_key") | ||
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type hashKeyType string | ||
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// SetAddrHashKey sets the hash key for this address. Combined with the | ||
// ring_hash load balancing policy, it allows placing the address on the ring | ||
// based on an arbitrary string instead of the IP address. | ||
// | ||
// # Experimental | ||
// | ||
// Notice: This API is EXPERIMENTAL and may be changed or removed in a | ||
// later release. | ||
func SetAddrHashKey(addr resolver.Address, hashKey string) resolver.Address { | ||
if hashKey == "" { | ||
return addr | ||
} | ||
addr.BalancerAttributes = addr.BalancerAttributes.WithValue(hashKeyKey, hashKey) | ||
return addr | ||
} | ||
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// GetAddrHashKey returns the ring hash key attribute of addr. If this attribute | ||
// is not set, it returns an empty string. | ||
// | ||
// # Experimental | ||
// | ||
// Notice: This API is EXPERIMENTAL and may be changed or removed in a | ||
// later release. | ||
func GetAddrHashKey(addr resolver.Address) string { | ||
hashKey, _ := addr.BalancerAttributes.Value(hashKeyKey).(string) | ||
return hashKey | ||
} |
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