package metadata import ( "golang.org/x/net/context" ) type metaKey struct{} // Metadata is our way of representing request headers internally. // They're used at the RPC level and translate back and forth // from Transport headers. type Metadata map[string]string func FromContext(ctx context.Context) (Metadata, bool) { md, ok := ctx.Value(metaKey{}).(Metadata) return md, ok } func NewContext(ctx context.Context, md Metadata) context.Context { return context.WithValue(ctx, metaKey{}, md) }