[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/go.etcd.io/etcd/clientv3/ctx.go b/vendor/go.etcd.io/etcd/clientv3/ctx.go
new file mode 100644
index 0000000..da8297b
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/clientv3/ctx.go
@@ -0,0 +1,64 @@
+// Copyright 2020 The etcd 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.
+
+package clientv3
+
+import (
+ "context"
+ "strings"
+
+ "github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
+ "github.com/coreos/etcd/version"
+ "google.golang.org/grpc/metadata"
+)
+
+// WithRequireLeader requires client requests to only succeed
+// when the cluster has a leader.
+func WithRequireLeader(ctx context.Context) context.Context {
+ md, ok := metadata.FromOutgoingContext(ctx)
+ if !ok { // no outgoing metadata ctx key, create one
+ md = metadata.Pairs(rpctypes.MetadataRequireLeaderKey, rpctypes.MetadataHasLeader)
+ return metadata.NewOutgoingContext(ctx, md)
+ }
+ copied := md.Copy() // avoid racey updates
+ // overwrite/add 'hasleader' key/value
+ metadataSet(copied, rpctypes.MetadataRequireLeaderKey, rpctypes.MetadataHasLeader)
+ return metadata.NewOutgoingContext(ctx, copied)
+}
+
+// embeds client version
+func withVersion(ctx context.Context) context.Context {
+ md, ok := metadata.FromOutgoingContext(ctx)
+ if !ok { // no outgoing metadata ctx key, create one
+ md = metadata.Pairs(rpctypes.MetadataClientAPIVersionKey, version.APIVersion)
+ return metadata.NewOutgoingContext(ctx, md)
+ }
+ copied := md.Copy() // avoid racey updates
+ // overwrite/add version key/value
+ metadataSet(copied, rpctypes.MetadataClientAPIVersionKey, version.APIVersion)
+ return metadata.NewOutgoingContext(ctx, copied)
+}
+
+func metadataGet(md metadata.MD, k string) []string {
+ k = strings.ToLower(k)
+ return md[k]
+}
+
+func metadataSet(md metadata.MD, k string, vals ...string) {
+ if len(vals) == 0 {
+ return
+ }
+ k = strings.ToLower(k)
+ md[k] = vals
+}