51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
// Copyright 2020 The etcd 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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package clientv3
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import (
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"context"
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"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
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"go.etcd.io/etcd/api/v3/version"
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"google.golang.org/grpc/metadata"
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)
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// WithRequireLeader requires client requests to only succeed
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// when the cluster has a leader.
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func WithRequireLeader(ctx context.Context) context.Context {
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md, ok := metadata.FromOutgoingContext(ctx)
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if !ok { // no outgoing metadata ctx key, create one
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md = metadata.Pairs(rpctypes.MetadataRequireLeaderKey, rpctypes.MetadataHasLeader)
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return metadata.NewOutgoingContext(ctx, md)
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}
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copied := md.Copy() // avoid racey updates
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// overwrite/add 'hasleader' key/value
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copied.Set(rpctypes.MetadataRequireLeaderKey, rpctypes.MetadataHasLeader)
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return metadata.NewOutgoingContext(ctx, copied)
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}
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// embeds client version
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func withVersion(ctx context.Context) context.Context {
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md, ok := metadata.FromOutgoingContext(ctx)
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if !ok { // no outgoing metadata ctx key, create one
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md = metadata.Pairs(rpctypes.MetadataClientAPIVersionKey, version.APIVersion)
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return metadata.NewOutgoingContext(ctx, md)
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}
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copied := md.Copy() // avoid racey updates
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// overwrite/add version key/value
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copied.Set(rpctypes.MetadataClientAPIVersionKey, version.APIVersion)
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return metadata.NewOutgoingContext(ctx, copied)
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}
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