mirror of https://github.com/grpc/grpc-go.git
85 lines
2.8 KiB
Go
85 lines
2.8 KiB
Go
/*
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*
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* Copyright 2019 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Package internal contains functions/structs shared by xds
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// balancers/resolvers.
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package internal
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import (
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"fmt"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/xds/internal/clients"
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)
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// LocalityString generates a string representation of clients.Locality in the
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// format specified in gRFC A76.
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func LocalityString(l clients.Locality) string {
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return fmt.Sprintf("{region=%q, zone=%q, sub_zone=%q}", l.Region, l.Zone, l.SubZone)
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}
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// IsLocalityEqual allows the values to be compared by Attributes.Equal.
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func IsLocalityEqual(l clients.Locality, o any) bool {
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ol, ok := o.(clients.Locality)
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if !ok {
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return false
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}
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return l.Region == ol.Region && l.Zone == ol.Zone && l.SubZone == ol.SubZone
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}
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// LocalityFromString converts a string representation of clients.locality as
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// specified in gRFC A76, into a LocalityID struct.
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func LocalityFromString(s string) (ret clients.Locality, _ error) {
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_, err := fmt.Sscanf(s, "{region=%q, zone=%q, sub_zone=%q}", &ret.Region, &ret.Zone, &ret.SubZone)
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if err != nil {
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return clients.Locality{}, fmt.Errorf("%s is not a well formatted locality ID, error: %v", s, err)
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}
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return ret, nil
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}
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type localityKeyType string
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const localityKey = localityKeyType("grpc.xds.internal.address.locality")
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// GetLocalityID returns the locality ID of addr.
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func GetLocalityID(addr resolver.Address) clients.Locality {
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path, _ := addr.BalancerAttributes.Value(localityKey).(clients.Locality)
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return path
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}
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// SetLocalityID sets locality ID in addr to l.
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func SetLocalityID(addr resolver.Address, l clients.Locality) resolver.Address {
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addr.BalancerAttributes = addr.BalancerAttributes.WithValue(localityKey, l)
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return addr
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}
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// SetLocalityIDInEndpoint sets locality ID in endpoint to l.
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func SetLocalityIDInEndpoint(endpoint resolver.Endpoint, l clients.Locality) resolver.Endpoint {
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endpoint.Attributes = endpoint.Attributes.WithValue(localityKey, l)
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return endpoint
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}
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// ResourceTypeMapForTesting maps TypeUrl to corresponding ResourceType.
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var ResourceTypeMapForTesting map[string]any
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// UnknownCSMLabels are TelemetryLabels emitted from CDS if CSM Telemetry Label
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// data is not present in the CDS Resource.
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var UnknownCSMLabels = map[string]string{
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"csm.service_name": "unknown",
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"csm.service_namespace_name": "unknown",
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}
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