public OperationResult CreateCSharp(string operationName, HttpRequestHandlerDefinition builderDefinition)
{
var requestBodyProperties = builderDefinition.Parameters.Where(x => x.BindingType == BindingType.FromBody || x.BindingType == BindingType.FromForm).ToArray();
var requestClass = builderDefinition.Definition.RequestType.Name + "_" + Guid.NewGuid().ToString().Replace("-", "");
var methodArgs = string.Join(", ", builderDefinition.Parameters.GroupBy(x => x.PropertyName).Select(x => new
{
Name = x.Key,
Type = x.First().BindingType == BindingType.FromBody || x.First().BindingType == BindingType.FromForm ? requestClass : GetCorrectFormat(x.First().PropertyInfo.PropertyType),
Binder = x.First().BindingType == BindingType.FromBody ? "FromBody" : "FromUri",
BindingType = x.First().BindingType
}).Select(x => $"[System.Web.Http.{x.Binder}Attribute] {x.Type} {x.Name}{CodeStr.If(x.BindingType == BindingType.FromQuery, $" = default({x.Type})")}"));
var isAsync = builderDefinition.Definition.ResponseType.IsConstructedGenericType &&
builderDefinition.Definition.ResponseType.GetGenericTypeDefinition() == typeof(Task <>);
var responseType = isAsync
? builderDefinition.Definition.ResponseType.GetGenericArguments()[0]
: builderDefinition.Definition.ResponseType;
var requestVariable = "request_" + Guid.NewGuid().ToString().Replace("-", "");
var operationResult = new OperationResult();
operationResult.OperationName = operationName;
operationResult.RequestClass = $@"public class {requestClass}
{{{CodeStr.Foreach(requestBodyProperties, source => $@"
public {GetCorrectFormat(source.PropertyInfo.PropertyType)} {source.PropertyInfo.Name} {{ get; set; }}")}
}}";
operationResult.Operation = $@"[System.Web.Http.Http{builderDefinition.HttpMethod}Attribute, {GetCorrectFormat(typeof(RouteAttribute))}(""{ builderDefinition.Route}""), {GetCorrectFormat(typeof(ResponseTypeAttribute))}(typeof({GetCorrectFormat(responseType)}))]
public {(isAsync ? "async " : string.Empty)}{GetCorrectFormat(isAsync ? typeof(Task<IHttpActionResult>) : typeof(IHttpActionResult))} {operationName}({methodArgs})
{{
var {requestVariable} = new {GetCorrectFormat(builderDefinition.Definition.RequestType)}();{CodeStr.Foreach(builderDefinition.Parameters, assignment => $@"
{requestVariable}.{assignment.PropertyInfo.Name} = {assignment.PropertyName}{(assignment.BindingType == BindingType.FromBody || assignment.BindingType == BindingType.FromForm ? $".{assignment.PropertyInfo.Name}" : "")};")}
var response = {(isAsync ? "await " : string.Empty)}_requestProcessor.Process{(isAsync ? "Async" : string.Empty)}<{GetCorrectFormat(builderDefinition.Definition.RequestType)},{GetCorrectFormat(responseType)}>({requestVariable}, this);
return response;
}}";
return(operationResult);
}
public Assembly Build(HttpRequestHandlerDefinition[] definitions)
{
var references = new AssemblyReferencesHelper()
.AddReferenceForTypes(typeof(object), typeof(ApiController), typeof(RequestHandlerControllerBuilder))
.AddReferenceForTypes(GetType())
.AddReferenceForTypes(definitions.SelectMany(x => new[] { x.Definition.RequestType, x.Definition.ResponseType }).ToArray())
.GetReferences();
var compilation = CSharpCompilation.Create(_assemblyName)
.WithOptions(new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
.WithOptimizationLevel(_debug ? OptimizationLevel.Debug : OptimizationLevel.Release))
.AddReferences(references);
var csharpControllers = new List <string>();
var operationResults = definitions.Select(temp => CreateCSharp(GetClassName(temp.Definition.RequestType), temp)).ToArray();
var files = new Dictionary <string, string>();
files.Add("ProxyController", $@"namespace Proxy
{{{CodeStr.If(!string.IsNullOrEmpty(_options.RoutePrefix), $@"
[{GetCorrectFormat(typeof(RoutePrefixAttribute))}(""{_options.RoutePrefix}"")]")}{CodeStr.Foreach(_options?.ControllerAttributeTypes, x => $@"
[{GetCorrectFormat(x)}]")}
public class ProxyController : {GetCorrectFormat(typeof(ApiController))}
{{
private readonly {GetCorrectFormat(typeof(IWebApiRequestProcessor))} _requestProcessor;
public ProxyController({GetCorrectFormat(typeof(IWebApiRequestProcessor))} requestProcessor)
{{
_requestProcessor = requestProcessor;
}}
{CodeStr.Foreach(operationResults.SelectMany(x => x.Operation.Split(new [] {Environment.NewLine}, StringSplitOptions.None)), operation => $@"
{ operation } ")}
}}
}}");
foreach (var operationResult in operationResults)
{
files.Add(operationResult.OperationName, operationResult.RequestClass);
}
foreach (var temp in files)
{
if (_debug)
{
var filePath = Path.Combine(Path.GetTempPath(), $"rc_{temp.Key}.cs");
File.WriteAllText(filePath, temp.Value, Encoding.UTF8);
compilation =
compilation.AddSyntaxTrees(CSharpSyntaxTree.ParseText(temp.Value, path: filePath,
encoding: Encoding.UTF8));
}
else
{
compilation = compilation.AddSyntaxTrees(CSharpSyntaxTree.ParseText(temp.Value));
}
}
if (!_debug)
{
var assemblyStream = new MemoryStream();
var result = compilation.Emit(assemblyStream);
CheckCompilationForErrors(result, csharpControllers);
assemblyStream.Seek(0, SeekOrigin.Begin);
return(Assembly.Load(assemblyStream.ToArray()));
}
else
{
var assemblyStream = new MemoryStream();
var pdbStream = new MemoryStream();
var result = compilation.Emit(assemblyStream, pdbStream);
CheckCompilationForErrors(result, csharpControllers);
assemblyStream.Seek(0, SeekOrigin.Begin);
pdbStream.Seek(0, SeekOrigin.Begin);
var rawAssembly = assemblyStream.ToArray();
return(Assembly.Load(rawAssembly, pdbStream.ToArray()));
}
}