1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/go.opencensus.io/tag/context.go b/vendor/go.opencensus.io/tag/context.go
new file mode 100644
index 0000000..ed528bc
--- /dev/null
+++ b/vendor/go.opencensus.io/tag/context.go
@@ -0,0 +1,41 @@
+// Copyright 2017, OpenCensus 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 tag
+
+import "context"
+
+// FromContext returns the tag map stored in the context.
+func FromContext(ctx context.Context) *Map {
+	// The returned tag map shouldn't be mutated.
+	ts := ctx.Value(mapCtxKey)
+	if ts == nil {
+		return nil
+	}
+	return ts.(*Map)
+}
+
+// NewContext creates a new context with the given tag map.
+// To propagate a tag map to downstream methods and downstream RPCs, add a tag map
+// to the current context. NewContext will return a copy of the current context,
+// and put the tag map into the returned one.
+// If there is already a tag map in the current context, it will be replaced with m.
+func NewContext(ctx context.Context, m *Map) context.Context {
+	return context.WithValue(ctx, mapCtxKey, m)
+}
+
+type ctxKey struct{}
+
+var mapCtxKey = ctxKey{}