public static async Task <OperationParserContext> CreateAsync(IReadOnlyList <string> sources)
{
var sourceToIndex = sources.Select((x, i) => new { Index = i, Source = x }).ToDictionary(x => x.Source, x => x.Index);
var sourceToServiceIndex = await PackageSourceUtility.GetSourceToServiceIndex(sources);
// This look-up is used to quickly find if a package base address is in one of the source's service indexes.
var packageBaseAddressToPairs = sourceToServiceIndex
.SelectMany(x => x
.Value
.GetServiceEntryUris(ServiceTypes.PackageBaseAddress)
.Select(u => new { Source = x.Key, ResourceUri = u, PackageBaseAddress = u.AbsoluteUri.TrimEnd('/') + '/' }))
.GroupBy(x => x.PackageBaseAddress)
.ToDictionary(x => x.Key, x => (IReadOnlyList <KeyValuePair <string, Uri> >)x
.Select(y => new KeyValuePair <string, Uri>(y.Source, y.ResourceUri))
.ToList());
// This look-up is used to find all of the sources with a certain package base address. This should
// normally be a one-to-one mapping, but you can't be too careful...
var packageBaseAddressToSources = packageBaseAddressToPairs
.ToDictionary(x => x.Key, x => (IReadOnlyList <string>)x.Value.Select(y => y.Key).Distinct().ToList());
return(new OperationParserContext(
sourceToIndex,
sourceToServiceIndex,
packageBaseAddressToPairs,
packageBaseAddressToSources));
}
public static async Task <Dictionary <Operation, StartRequest> > BuildAsync(IReadOnlyList <string> sources, IEnumerable <Operation> operations)
{
var sourceToServiceIndex = await PackageSourceUtility.GetSourceToServiceIndex(sources);
var packageBaseAddresses = sourceToServiceIndex
.Select(x => x.Value.GetServiceEntryUri(ServiceTypes.PackageBaseAddress).AbsoluteUri.TrimEnd('/') + '/')
.ToList();
var output = new Dictionary <Operation, StartRequest>();
foreach (var operation in operations)
{
if (output.ContainsKey(operation))
{
continue;
}
var packageBaseAddress = packageBaseAddresses[operation.SourceIndex];
StartRequest request;
string id;
string version;
switch (operation.Type)
{
case OperationType.PackageBaseAddressIndex:
var packageBaseAddressIndex = (OperationWithId)operation;
id = packageBaseAddressIndex.Id.ToLowerInvariant();
request = new StartRequest("GET", $"{packageBaseAddress}{id}/index.json");
break;
case OperationType.PackageBaseAddressNupkg:
var packageBaseAddressNupkg = (OperationWithIdVersion)operation;
id = packageBaseAddressNupkg.Id.ToLowerInvariant();
version = packageBaseAddressNupkg.Version.ToLowerInvariant();
request = new StartRequest("GET", $"{packageBaseAddress}{id}/{version}/{id}.{version}.nupkg");
break;
default:
throw new NotSupportedException($"The operation type {operation.Type} is not supported.");
}
output.Add(operation, request);
}
return(output);
}