private async Task <dynamic> GetAsyncInternal(string key, IList <string> providers)
{
var srn = new Srn {
Namespace = _nameSpace, Key = key
};
// System namespace forces the JSON provider
if (_nameSpace == "system" && key != null && !key.StartsWith("security"))
{
return(await _repository.GetProvider("json").GetAsync(srn));
}
// If we're not looking for all just return a specific result.
if (providers.Count == 1 && providers.SingleOrDefault() != "any")
{
return(await _repository.GetProvider(providers.SingleOrDefault()).GetAsync(srn));
}
if (!srn.HasNamespace() || !srn.HasKey())
{
throw new SrnException("Bulk queries support fully qualified SRNs only.");
}
// This is the code that merges results together from all providers into one result.
// The code will always return the first instance of a result. Duplicates are ignored.
foreach (var(k, v) in _repository.GetProviders())
{
// allow only whitelisted providers
if (!providers.Contains(k))
{
continue;
}
var result = await v.GetAsync(srn);
if (result != null)
{
return(result);
}
}
// No match found in any provider :(
return(null);
}
internal Srn(Srn value)
{
Version = value.Version;
Namespace = value.Namespace;
Key = value.Key;
}