NiceMD is a convenience wrapper defining extra functions on the metadata.
type NiceMD metadata.MD
func ExtractIncoming(ctx context.Context) NiceMD
ExtractIncoming extracts an inbound metadata from the server-side context.
This function always returns a NiceMD wrapper of the metadata.MD, in case the context doesn't have metadata it returns a new empty NiceMD.
func ExtractOutgoing(ctx context.Context) NiceMD
ExtractOutgoing extracts an outbound metadata from the client-side context.
This function always returns a NiceMD wrapper of the metadata.MD, in case the context doesn't have metadata it returns a new empty NiceMD.
func (m NiceMD) Add(key string, value string) NiceMD
Add retrieves a single value from the metadata.
It works analogously to http.Header.Add, as it appends to any existing values associated with key.
The function is binary-key safe.
func (m NiceMD) Clone(copiedKeys ...string) NiceMD
Clone performs a *deep* copy of the metadata.MD.
You can specify the lower-case copiedKeys to only copy certain allow-listed keys. If no keys are explicitly allow-listed all keys get copied.
func (m NiceMD) Del(key string) NiceMD
func (m NiceMD) Get(key string) string
Get retrieves a single value from the metadata.
It works analogously to http.Header.Get, returning the first value if there are many set. If the value is not set, an empty string is returned.
The function is binary-key safe.
func (m NiceMD) Set(key string, value string) NiceMD
Set sets the given value in a metadata.
It works analogously to http.Header.Set, overwriting all previous metadata values.
The function is binary-key safe.
func (m NiceMD) ToIncoming(ctx context.Context) context.Context
ToIncoming sets the given NiceMD as a server-side context for dispatching.
This is mostly useful in ServerInterceptors..
func (m NiceMD) ToOutgoing(ctx context.Context) context.Context
ToOutgoing sets the given NiceMD as a client-side context for dispatching.