private void ReloadScript()
{
// Reset cached function
ResetFunctionValue();
TraceWriter.Verbose(string.Format(CultureInfo.InvariantCulture, "Script for function '{0}' changed. Reloading.", Metadata.Name));
TraceWriter.Verbose("Compiling function script.");
Script <object> script = CreateScript();
Compilation compilation = script.GetCompilation();
ImmutableArray <Diagnostic> compilationResult = compilation.GetDiagnostics();
CSharpFunctionSignature signature = CSharpFunctionSignature.FromCompilation(compilation, _functionEntryPointResolver);
compilationResult = ValidateFunctionBindingArguments(signature, compilationResult.ToBuilder());
TraceCompilationDiagnostics(compilationResult);
bool compilationSucceeded = !compilationResult.Any(d => d.Severity == DiagnosticSeverity.Error);
TraceWriter.Verbose(string.Format(CultureInfo.InvariantCulture, "Compilation {0}.",
compilationSucceeded ? "succeeded" : "failed"));
// If the compilation succeeded, AND:
// - We haven't cached a function (failed to compile on load), OR
// - We're referencing local function types (i.e. POCOs defined in the function) AND Our our function signature has changed
// Restart our host.
if (compilationSucceeded &&
(_functionSignature == null ||
(_functionSignature.HasLocalTypeReference || !_functionSignature.Equals(signature))))
{
_host.RestartEvent.Set();
}
}
private MethodInfo CreateFunctionTarget(CancellationToken cancellationToken)
{
// TODO:Get this from some context set in/by the host.
bool debug = true;
MemoryStream assemblyStream = null;
MemoryStream pdbStream = null;
try
{
Script <object> script = CreateScript();
Compilation compilation = GetScriptCompilation(script, debug);
CSharpFunctionSignature functionSignature = CSharpFunctionSignature.FromCompilation(compilation, _functionEntryPointResolver);
ValidateFunctionBindingArguments(functionSignature, throwIfFailed: true);
using (assemblyStream = new MemoryStream())
{
using (pdbStream = new MemoryStream())
{
var result = compilation.Emit(assemblyStream, pdbStream);
// Check if cancellation was requested while we were compiling,
// and if so quit here.
cancellationToken.ThrowIfCancellationRequested();
if (!result.Success)
{
throw new CompilationErrorException("Script compilation failed.", result.Diagnostics);
}
Assembly assembly = Assembly.Load(assemblyStream.GetBuffer(), pdbStream.GetBuffer());
_assemblyLoader.CreateOrUpdateContext(Metadata, assembly, _metadataResolver, TraceWriter);
// Get our function entry point
System.Reflection.TypeInfo scriptType = assembly.DefinedTypes.FirstOrDefault(t => string.Compare(t.Name, ScriptClassName, StringComparison.Ordinal) == 0);
_functionSignature = functionSignature;
return(_functionEntryPointResolver.GetFunctionEntryPoint(scriptType.DeclaredMethods.ToList()));
}
}
}
catch (CompilationErrorException ex)
{
TraceWriter.Error("Function compilation error");
TraceCompilationDiagnostics(ex.Diagnostics);
throw;
}
}
private ImmutableArray <Diagnostic> ValidateFunctionBindingArguments(CSharpFunctionSignature functionSignature,
ImmutableArray <Diagnostic> .Builder builder = null, bool throwIfFailed = false)
{
var resultBuilder = builder ?? ImmutableArray <Diagnostic> .Empty.ToBuilder();
if (!functionSignature.Parameters.Any(p => string.Compare(p.Name, _triggerInputName, StringComparison.Ordinal) == 0))
{
string message = string.Format(CultureInfo.InvariantCulture, "Missing a trigger argument named '{0}'.", _triggerInputName);
var descriptor = new DiagnosticDescriptor(CSharpConstants.MissingTriggerArgumentCompilationCode,
"Missing trigger argument", message, "AzureFunctions", DiagnosticSeverity.Error, true);
resultBuilder.Add(Diagnostic.Create(descriptor, Location.None));
}
var bindings = _inputBindings.Where(b => !b.Metadata.IsTrigger).Union(_outputBindings);
foreach (var binding in bindings)
{
if (binding.Metadata.Type == BindingType.Http)
{
continue;
}
if (!functionSignature.Parameters.Any(p => string.Compare(p.Name, binding.Metadata.Name, StringComparison.Ordinal) == 0))
{
string message = string.Format(CultureInfo.InvariantCulture, "Missing binding argument named '{0}'.", binding.Metadata.Name);
var descriptor = new DiagnosticDescriptor(CSharpConstants.MissingBindingArgumentCompilationCode,
"Missing binding argument", message, "AzureFunctions", DiagnosticSeverity.Warning, true);
resultBuilder.Add(Diagnostic.Create(descriptor, Location.None));
}
}
ImmutableArray <Diagnostic> result = resultBuilder.ToImmutable();
if (throwIfFailed && result.Any(d => d.Severity == DiagnosticSeverity.Error))
{
throw new CompilationErrorException("Function compilation failed.", result);
}
return(resultBuilder.ToImmutable());
}
