func writeRequestHeaders(
ctx context.Context,
format tchannel.Format,
appHeaders map[string]string,
getWriter func() (tchannel.ArgWriter, error),
) error {
headers := transport.NewHeadersWithCapacity(len(appHeaders))
// TODO: zero-alloc version
for k, v := range appHeaders {
headers = headers.With(k, v)
}
return writeHeaders(format, headers, getWriter)
}
// decodeHeaders decodes headers using the format:
//
// nh:2 (k~2 v~2){nh}
func decodeHeaders(r io.Reader) (transport.Headers, error) {
reader := internal.NewReader(r)
count := reader.ReadUint16()
if count == 0 {
return transport.Headers{}, reader.Err()
}
headers := transport.NewHeadersWithCapacity(int(count))
for i := 0; i < int(count) && reader.Err() == nil; i++ {
k := reader.ReadLen16String()
v := reader.ReadLen16String()
headers = headers.With(k, v)
}
return headers, reader.Err()
}