/// <summary>
/// This will try to resolve the requested assembly by looking into the cache
/// </summary>
/// <param name="sender">object</param>
/// <param name="resolveEventArgs">ResolveEventArgs</param>
/// <returns>Assembly</returns>
private Assembly AssemblyResolve(object sender, ResolveEventArgs resolveEventArgs)
{
var assemblyName = new AssemblyName(resolveEventArgs.Name);
// Fail fast for resolving .resources requests
if (assemblyName.Name.EndsWith(".resources"))
{
return(null);
}
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Resolving {0}", assemblyName.FullName);
}
if (_resolving.Contains(assemblyName.Name))
{
Log.Warn().WriteLine("Ignoring recursive resolve event for {0}", assemblyName.Name);
return(null);
}
if (LoadedAssemblies.TryGetValue(assemblyName.Name, out var assemblyResult))
{
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Returned {0} from cache.", assemblyName.Name);
}
return(assemblyResult);
}
try
{
_resolving.Add(assemblyName.Name);
if (!AvailableAssemblies.TryGetValue(assemblyName.Name, out var assemblyLocationInformation))
{
return(null);
}
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Found {0} at {1}.", assemblyName.Name, assemblyLocationInformation.ToString());
}
return(LoadAssembly(assemblyLocationInformation));
}
finally
{
_resolving.Remove(assemblyName.Name);
}
}
/// <summary>
/// Load a named assembly
/// </summary>
/// <param name="assemblyName">string</param>
/// <returns>Assembly</returns>
public Assembly LoadAssembly(string assemblyName)
{
// Check if the simple name can be found in the cache
if (LoadedAssemblies.TryGetValue(assemblyName, out var assembly))
{
Log.Info().WriteLine("Returned {0} from cache.", assemblyName);
return(assembly);
}
if (AvailableAssemblies.TryGetValue(assemblyName, out var assemblyLocationInformation))
{
return(LoadAssembly(assemblyLocationInformation));
}
return(Assembly.Load(assemblyName));
}
/// <summary>
/// Internally tries to retrieve a previously compiled template from cache
/// if not found compiles a template into an assembly
/// always returns an assembly id as a string.
/// </summary>
/// <param name="templateText">The text to parse</param>
/// <returns>assembly id as a string or null on error</returns>
protected virtual CompiledAssemblyItem GetAssemblyFromStringAndCache(string templateText)
{
var hash = templateText.GetHashCode();
CompiledAssemblyItem item;
LoadedAssemblies.TryGetValue(hash, out item);
string assemblyId = null;
// Check for cached instance
if (item != null)
{
assemblyId = item.AssemblyId;
}
else
{
item = new CompiledAssemblyItem();
}
// No cached instance - create assembly and cache
if (assemblyId == null)
{
var safeClassName = GetSafeClassName(null);
using (var reader = new StringReader(templateText))
{
var refAssemblies = ReferencedAssemblies.ToArray();
assemblyId = Engine.ParseAndCompileTemplate(refAssemblies, reader, GeneratedNamespace, safeClassName);
}
if (assemblyId == null)
{
ErrorMessage = Engine.ErrorMessage;
return(null);
}
item.AssemblyId = assemblyId;
item.CompileTimeUtc = DateTime.UtcNow;
item.SafeClassName = safeClassName;
LoadedAssemblies[hash] = item;
}
return(item);
}
/// <summary>
/// Load an assembly from the specified location
/// </summary>
/// <param name="assemblyLocationInformation">AssemblyLocationInformation</param>
/// <returns>Assembly</returns>
public Assembly LoadAssembly(AssemblyLocationInformation assemblyLocationInformation)
{
// Check if the simple name can be found in the cache
if (LoadedAssemblies.TryGetValue(assemblyLocationInformation.Name, out var assembly))
{
if (Log.IsInfoEnabled())
{
Log.Info().WriteLine("Returned {0} from cache.", assemblyLocationInformation.Name);
}
return(assembly);
}
if (assemblyLocationInformation.IsEmbedded)
{
return(LoadEmbeddedAssembly(assemblyLocationInformation));
}
// Load from file
return(LoadFromFile(assemblyLocationInformation));
}
/// <summary>
/// Load an assembly via a file, this used via Assembly.Load or Assembly.LoadFrom depending on where the file is or can be stored
/// </summary>
/// <param name="additionalInformation">AssemblyLocationInformation used for some decisions</param>
/// <returns>Assembly</returns>
private Assembly LoadFromFile(AssemblyLocationInformation additionalInformation)
{
// Get the assembly name from the file
var assemblyName = AssemblyName.GetAssemblyName(additionalInformation.Filename);
// Check the cache again, this time with the "real" name
if (LoadedAssemblies.TryGetValue(assemblyName.Name, out var assembly))
{
if (Log.IsInfoEnabled())
{
Log.Info().WriteLine("Returned {0} from cache.", assemblyName.Name);
}
return(assembly);
}
var destination = $@"{FileLocations.AddonsLocation}\{assemblyName.Name}.dll";
var destinationIsNotSource = !destination.Equals(additionalInformation.Filename, StringComparison.OrdinalIgnoreCase);
if (Log.IsDebugEnabled() && !destinationIsNotSource)
{
Log.Debug().WriteLine("Skipping copy, as destination and source would be the same.");
}
if (_applicationConfig.CopyAssembliesToProbingPath && FileLocations.AddonsLocation != null && destinationIsNotSource)
{
try
{
if (ShouldWrite(additionalInformation, destination))
{
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Creating a copy of {0} to {1}, solving potential context loading issues.", additionalInformation.Filename, destination);
}
File.Copy(additionalInformation.Filename, destination);
// Register delete on exit, this is done by calling a command
_assembliesToDeleteAtExit.Add(destination);
}
// Load via the assembly name, it's not inside the probing path
assembly = Assembly.Load(assemblyName);
if (assembly != null)
{
return(assembly);
}
}
catch (Exception ex)
{
Log.Warn().WriteLine(ex, "Couldn't create a copy of {0} to {1}.", additionalInformation.Filename, destination);
}
}
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Loading {0} from {1}.", additionalInformation.Name, additionalInformation.Filename);
}
try
{
return(Assembly.LoadFrom(additionalInformation.Filename));
}
catch (Exception ex)
{
Log.Error().WriteLine(ex, "Couldn't load assembly from file {0}", additionalInformation.Filename);
}
return(null);
}