/// <exception cref="IOException"/>
/// <exception cref="BadImageFormatException" />
private AssemblyMetadata CreateAssemblyMetadata(
FileKey fileKey, ModuleMetadata manifestModule, List <ITemporaryStreamStorage> storages,
Func <FileKey, List <ITemporaryStreamStorage>, ModuleMetadata> moduleMetadataFactory)
{
var moduleBuilder = ArrayBuilder <ModuleMetadata> .GetInstance();
string assemblyDir = null;
foreach (string moduleName in manifestModule.GetModuleNames())
{
if (moduleBuilder.Count == 0)
{
moduleBuilder.Add(manifestModule);
assemblyDir = Path.GetDirectoryName(fileKey.FullPath);
}
var moduleFileKey = FileKey.Create(PathUtilities.CombineAbsoluteAndRelativePaths(assemblyDir, moduleName));
var metadata = moduleMetadataFactory(moduleFileKey, storages);
moduleBuilder.Add(metadata);
}
if (moduleBuilder.Count == 0)
{
moduleBuilder.Add(manifestModule);
}
return(AssemblyMetadata.Create(
moduleBuilder.ToImmutableAndFree()));
}
/// <exception cref="IOException"/>
/// <exception cref="BadImageFormatException" />
private AssemblyMetadata CreateAssemblyMetadata(
FileKey fileKey, ModuleMetadata manifestModule, List <ITemporaryStreamStorage> storages,
Func <FileKey, List <ITemporaryStreamStorage>, ModuleMetadata> moduleMetadataGetter)
{
ImmutableArray <ModuleMetadata> .Builder moduleBuilder = null;
string assemblyDir = null;
foreach (string moduleName in manifestModule.GetModuleNames())
{
if (moduleBuilder == null)
{
moduleBuilder = ImmutableArray.CreateBuilder <ModuleMetadata>();
moduleBuilder.Add(manifestModule);
assemblyDir = Path.GetDirectoryName(fileKey.FullPath);
}
var moduleFileKey = FileKey.Create(PathUtilities.CombineAbsoluteAndRelativePaths(assemblyDir, moduleName));
var metadata = moduleMetadataGetter(moduleFileKey, storages);
moduleBuilder.Add(metadata);
}
var modules = (moduleBuilder != null) ? moduleBuilder.ToImmutable() : ImmutableArray.Create(manifestModule);
return(AssemblyMetadata.Create(modules));
}
private MetadataShadowCopy GetMetadataShadowCopyNoCheck(
string fullPath,
MetadataImageKind kind
)
{
if (kind < MetadataImageKind.Assembly || kind > MetadataImageKind.Module)
{
throw new ArgumentOutOfRangeException(nameof(kind));
}
FileKey key = FileKey.Create(fullPath);
lock (Guard)
{
CacheEntry <MetadataShadowCopy> existing;
if (CopyExistsOrIsSuppressed(key, out existing))
{
return(existing.Public);
}
}
CacheEntry <MetadataShadowCopy> newCopy = CreateMetadataShadowCopy(fullPath, kind);
// last-write timestamp is copied from the original file at the time the snapshot was made:
bool fault = true;
try
{
key = new FileKey(
fullPath,
FileUtilities.GetFileTimeStamp(newCopy.Public.PrimaryModule.FullPath)
);
fault = false;
}
finally
{
if (fault)
{
newCopy.Private.Dispose();
}
}
lock (Guard)
{
CacheEntry <MetadataShadowCopy> existing;
if (CopyExistsOrIsSuppressed(key, out existing))
{
newCopy.Private.Dispose();
return(existing.Public);
}
_shadowCopies.Add(key, newCopy);
}
return(newCopy.Public);
}
/// <summary>
/// A unique file key encapsulates a file path, and change date
/// that can be used as the key to a dictionary.
/// If a file hasn't changed name or timestamp, we assume
/// it is unchanged.
///
/// Returns null if the file doesn't exist or otherwise can't be accessed.
/// </summary>
private FileKey?GetUniqueFileKey(string filePath)
{
try
{
return(FileKey.Create(filePath));
}
catch (Exception)
{
// There are several exceptions that can occur here: NotSupportedException or PathTooLongException
// for a bad path, UnauthorizedAccessException for access denied, etc. Rather than listing them all,
// just catch all exceptions.
return(null);
}
}
/// <summary>
/// Gets or creates metadata for specified file path.
/// </summary>
/// <param name="fullPath">Full path to an assembly manifest module file or a standalone module file.</param>
/// <param name="kind">Metadata kind (assembly or module).</param>
/// <returns>Metadata for the specified file.</returns>
/// <exception cref="IOException">Error reading file <paramref name="fullPath"/>. See <see cref="Exception.InnerException"/> for details.</exception>
public Metadata GetMetadata(string fullPath, MetadataImageKind kind)
{
if (NeedsShadowCopy(fullPath))
{
return(GetMetadataShadowCopyNoCheck(fullPath, kind).Metadata);
}
FileKey key = FileKey.Create(fullPath);
lock (Guard)
{
CacheEntry <Metadata> existing;
if (_noShadowCopyCache.TryGetValue(key, out existing))
{
return(existing.Public);
}
}
Metadata newMetadata;
if (kind == MetadataImageKind.Assembly)
{
newMetadata = AssemblyMetadata.CreateFromFile(fullPath);
}
else
{
newMetadata = ModuleMetadata.CreateFromFile(fullPath);
}
// the files are locked (memory mapped) now
key = FileKey.Create(fullPath);
lock (Guard)
{
CacheEntry <Metadata> existing;
if (_noShadowCopyCache.TryGetValue(key, out existing))
{
newMetadata.Dispose();
return(existing.Public);
}
Metadata publicMetadata = newMetadata.Copy();
_noShadowCopyCache.Add(key, new CacheEntry <Metadata>(publicMetadata, newMetadata));
return(publicMetadata);
}
}