/// <summary>
/// Gets the view for an input document (which is different than the view for a layout, partial, or
/// other indirect view because it's not necessarily on disk or in the file system).
/// </summary>
private IView GetViewFromStream(IServiceProvider serviceProvider, RenderRequest request, IRazorPage page)
{
StatiqRazorProjectFileSystem projectFileSystem = serviceProvider.GetRequiredService <StatiqRazorProjectFileSystem>();
IEnumerable <string> viewStartLocations = request.ViewStartLocation != null
? new[] { request.ViewStartLocation }
: projectFileSystem.FindHierarchicalItems(request.RelativePath, ViewStartFileName).Select(x => x.FilePath);
List <IRazorPage> viewStartPages = viewStartLocations
.Select(serviceProvider.GetRequiredService <IRazorPageFactoryProvider>().CreateFactory)
.Where(x => x.Success)
.Select(x => x.RazorPageFactory())
.Reverse()
.ToList();
if (request.LayoutLocation != null)
{
page.Layout = request.LayoutLocation;
}
IRazorViewEngine viewEngine = serviceProvider.GetRequiredService <IRazorViewEngine>();
IRazorPageActivator pageActivator = serviceProvider.GetRequiredService <IRazorPageActivator>();
HtmlEncoder htmlEncoder = serviceProvider.GetRequiredService <HtmlEncoder>();
DiagnosticSource diagnosticSource = serviceProvider.GetRequiredService <DiagnosticSource>();
return(new RazorView(viewEngine, pageActivator, viewStartPages, page, htmlEncoder, diagnosticSource));
}
private ViewContext GetViewContext(IServiceProvider serviceProvider, RenderRequest request, IView view, TextWriter output)
{
HttpContext httpContext = new DefaultHttpContext
{
RequestServices = serviceProvider
};
ActionContext actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());
ViewDataDictionary viewData = new ViewDataDictionary(new EmptyModelMetadataProvider(), actionContext.ModelState)
{
Model = request.Model
};
ITempDataDictionary tempData = new TempDataDictionary(actionContext.HttpContext, serviceProvider.GetRequiredService <ITempDataProvider>());
return(new ViewContext(
actionContext,
view,
viewData,
tempData,
output,
new HtmlHelperOptions(),
request.Document,
request.Context));
}
/// <inheritdoc />
protected override async Task <IEnumerable <IDocument> > ExecuteContextAsync(IExecutionContext context)
{
// Expire the internal Razor cache if this is a new execution
// This needs to be done so that layouts/partials can be re-rendered if they've changed,
// otherwise Razor will just use the previously cached version of them
if (_executionId != Guid.Empty && _executionId != context.ExecutionId)
{
RazorService.ExpireChangeTokens();
}
_executionId = context.ExecutionId;
// Eliminate input documents that we shouldn't process
ImmutableArray <IDocument> validInputs = context.Inputs
.Where(x => _ignorePrefix == null || x.Source.IsNull || !x.Source.FileName.FullPath.StartsWith(_ignorePrefix))
.ToImmutableArray();
if (validInputs.Length < context.Inputs.Length)
{
context.LogInformation($"Ignoring {context.Inputs.Length - validInputs.Length} inputs due to source file name prefix");
}
// Compile and evaluate the pages in parallel
return(await validInputs.ParallelSelectAsync(RenderDocumentAsync));
async Task <IDocument> RenderDocumentAsync(IDocument input)
{
context.LogDebug("Processing Razor for {0}", input.ToSafeDisplayString());
using (Stream contentStream = await context.GetContentStreamAsync())
{
using (Stream inputStream = input.GetContentStream())
{
NormalizedPath viewStartLocationPath = _viewStartPath == null ? null : await _viewStartPath.GetValueAsync(input, context);
NormalizedPath layoutPath = _layoutPath == null ? NormalizedPath.Null : (await _layoutPath.GetValueAsync(input, context));
string layoutLocation = layoutPath.IsNull ? null : layoutPath.FullPath;
RenderRequest request = new RenderRequest
{
Input = inputStream,
Output = contentStream,
BaseType = _basePageType,
Context = context,
Document = input,
LayoutLocation = layoutLocation,
ViewStartLocation = viewStartLocationPath.IsNull ? null : GetRelativePath(viewStartLocationPath, context),
RelativePath = GetRelativePath(input, context),
Model = _model == null ? input : await _model.GetValueAsync(input, context)
};
await RazorService.RenderAsync(request);
}
return(input.Clone(context.GetContentProvider(contentStream, MediaTypes.Html)));
}
}
}
public async Task RenderAsync(RenderRequest request)
{
CompilationParameters parameters = new CompilationParameters
{
BasePageType = request.BaseType,
Namespaces = new NamespaceCollection(request.Context.Namespaces)
};
RazorCompiler compiler = _compilers.GetOrAdd(parameters, _ => new RazorCompiler(parameters, request.Context));
await compiler.RenderPageAsync(request);
}
public CompilerCacheKey(RenderRequest request, byte[] fileHash)
{
_request = request;
_fileHash = fileHash;
// Precalculate hash code since we know we'll need it
_hashCode = 17;
_hashCode = (_hashCode * 31) + (_request.LayoutLocation?.GetHashCode() ?? 0);
_hashCode = (_hashCode * 31) + (_request.ViewStartLocation?.GetHashCode() ?? 0);
foreach (byte b in _fileHash)
{
_hashCode = (_hashCode * 31) ^ b;
}
}
public async Task RenderPageAsync(RenderRequest request)
{
using (IServiceScope scope = _serviceScopeFactory.CreateScope())
{
IServiceProvider serviceProvider = scope.ServiceProvider;
IRazorPage page = GetPageFromStream(serviceProvider, request);
IView view = GetViewFromStream(serviceProvider, request, page);
using (StreamWriter writer = request.Output.GetWriter())
{
Microsoft.AspNetCore.Mvc.Rendering.ViewContext viewContext = GetViewContext(serviceProvider, request, view, writer);
await viewContext.View.RenderAsync(viewContext);
}
}
}
/// <summary>
/// Gets the Razor page for an input document stream. This is roughly modeled on
/// DefaultRazorPageFactory and CompilerCache. Note that we don't actually bother
/// with caching the page if it's from a live stream.
/// </summary>
private IRazorPage GetPageFromStream(IServiceProvider serviceProvider, RenderRequest request)
{
string relativePath = request.RelativePath;
if (relativePath.StartsWith("~/", StringComparison.Ordinal))
{
// For tilde slash paths, drop the leading ~ to make it work with the underlying IFileProvider.
relativePath = relativePath.Substring(1);
}
// Get the file info by combining the stream content with info found at the document's original location (if any)
StatiqRazorProjectFileSystem projectFileSystem = serviceProvider.GetRequiredService <StatiqRazorProjectFileSystem>();
RazorProjectItem projectItem = projectFileSystem.GetItem(relativePath, request.Input);
// Compute a hash for the content since pipelines could have changed it from the underlying file
// We have to pre-compute the hash (I.e., no CryptoStream) since we need to check for a hit before reading/compiling the view
byte[] hash = SHA512.Create().ComputeHash(request.Input);
request.Input.Position = 0;
CompilationResult compilationResult = CompilePage(serviceProvider, request, hash, projectItem, projectFileSystem);
return(compilationResult.GetPage(request.RelativePath));
}
private CompilationResult CompilePage(IServiceProvider serviceProvider, RenderRequest request, byte[] hash, RazorProjectItem projectItem, RazorProjectFileSystem projectFileSystem)
{
CompilerCacheKey cacheKey = new CompilerCacheKey(request, hash);
return(_compilationCache.GetOrAdd(cacheKey, _ => GetCompilation(projectItem, projectFileSystem)));
}