[VOL-3196] Enhanced gRPC interfaces to create and propagate Span for log correlation
Change-Id: I48389ca3e8675b64515bfd3088a4de9b688f5cae
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tags/context.go b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tags/context.go
new file mode 100644
index 0000000..583025c
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tags/context.go
@@ -0,0 +1,78 @@
+package grpc_ctxtags
+
+import (
+ "context"
+)
+
+type ctxMarker struct{}
+
+var (
+ // ctxMarkerKey is the Context value marker used by *all* logging middleware.
+ // The logging middleware object must interf
+ ctxMarkerKey = &ctxMarker{}
+ // NoopTags is a trivial, minimum overhead implementation of Tags for which all operations are no-ops.
+ NoopTags = &noopTags{}
+)
+
+// Tags is the interface used for storing request tags between Context calls.
+// The default implementation is *not* thread safe, and should be handled only in the context of the request.
+type Tags interface {
+ // Set sets the given key in the metadata tags.
+ Set(key string, value interface{}) Tags
+ // Has checks if the given key exists.
+ Has(key string) bool
+ // Values returns a map of key to values.
+ // Do not modify the underlying map, please use Set instead.
+ Values() map[string]interface{}
+}
+
+type mapTags struct {
+ values map[string]interface{}
+}
+
+func (t *mapTags) Set(key string, value interface{}) Tags {
+ t.values[key] = value
+ return t
+}
+
+func (t *mapTags) Has(key string) bool {
+ _, ok := t.values[key]
+ return ok
+}
+
+func (t *mapTags) Values() map[string]interface{} {
+ return t.values
+}
+
+type noopTags struct{}
+
+func (t *noopTags) Set(key string, value interface{}) Tags {
+ return t
+}
+
+func (t *noopTags) Has(key string) bool {
+ return false
+}
+
+func (t *noopTags) Values() map[string]interface{} {
+ return nil
+}
+
+// Extracts returns a pre-existing Tags object in the Context.
+// If the context wasn't set in a tag interceptor, a no-op Tag storage is returned that will *not* be propagated in context.
+func Extract(ctx context.Context) Tags {
+ t, ok := ctx.Value(ctxMarkerKey).(Tags)
+ if !ok {
+ return NoopTags
+ }
+
+ return t
+}
+
+func setInContext(ctx context.Context, tags Tags) context.Context {
+ return context.WithValue(ctx, ctxMarkerKey, tags)
+}
+
+func newTags() Tags {
+ return &mapTags{values: make(map[string]interface{})}
+}