static void Main()
{
Func<IFoo> getFoo = () => new DummyFoo();
var module = new CommandModule(getFoo);
var resolver = new CommandHandlerResolver(module);
var commandMediaTypeMap = new CommandMediaTypeMap(new CommandMediaTypeWithQualifierVersionFormatter())
{
// Use a string to decouple command name from the command clr type. This will ensure
// refactoring, i.e. moving CommandThatHasASyncHandler or renaming it, won't change your http API.
{ "CommandThatHasASyncHandler", typeof(CommandThatHasASyncHandler) },
// Can use typeof().Name if you are not concerned with backwards compat or versioning.
{ typeof(CommandThatHasAnAsyncHandler).Name, typeof(CommandThatHasAnAsyncHandler) },
};
var settings = new CommandHandlingSettings(resolver, commandMediaTypeMap);
var commandHandlingMiddleware = CommandHandlingMiddleware.HandleCommands(settings);
// 5. Add the middleware to your owin pipeline
using(WebApp.Start("http://localhost:8080",
app =>
{
app.Use(commandHandlingMiddleware);
}))
{
Console.WriteLine("Press any key");
}
}
private static void Main()
{
var resolver = new CommandHandlerResolver(new CommandModule());
var settings = new CommandHandlingSettings(
resolver,
new CommandMediaTypeMap(new CommandMediaTypeWithQualifierVersionFormatter()));
var commandHandlingMiddleware = CommandHandlingMiddleware.HandleCommands(settings);
using(WebApp.Start("http://*****:*****@"..\..\wwwroot")
});
app.UseStaticFiles(new StaticFileOptions
{
RequestPath = new PathString("/cedarjs"),
FileSystem = new PhysicalFileSystem(@"..\..\..\Cedar.HttpCommandHandling.Js")
});
app.Map("/test/commands", commandsApp => commandsApp.Use(commandHandlingMiddleware));
}))
{
Process.Start("http://localhost:8080/index.html");
Console.WriteLine("Press any key to exit");
Console.ReadKey();
}
}
/// <summary>
/// Creats a command handling middlware.
/// </summary>
/// <param name="settings">Settings to configure the middleware.</param>
/// <returns>An owin middleware function (MidFunc) that represents </returns>
public static MidFunc HandleCommands(CommandHandlingSettings settings)
{
Condition.Requires(settings, "settings").IsNotNull();
return(next =>
{
var webApiConfig = ConfigureWebApi(settings);
var appBuilder = new AppBuilder();
appBuilder
.UseWebApi(webApiConfig)
.Run(ctx => next(ctx.Environment));
return appBuilder.Build();
});
}
/// <summary>
/// Creats a command handling middlware.
/// </summary>
/// <param name="settings">Settings to configure the middleware.</param>
/// <returns>An owin middleware function (MidFunc) that represents </returns>
public static MidFunc HandleCommands(CommandHandlingSettings settings)
{
Ensure.That(settings, "settings").IsNotNull();
return next =>
{
var webApiConfig = ConfigureWebApi(settings);
var appBuilder = new AppBuilder();
appBuilder
.UseWebApi(webApiConfig)
.Run(ctx => next(ctx.Environment));
return appBuilder.Build();
};
}
public void When_deserializer_throws_then_should_throw_HttpProblemDetailsException()
{
var sut = new CommandHandlingSettings(A.Fake<ICommandHandlerResolver>(), A.Fake<ResolveCommandType>());
Action act = () =>
{
using(var reader = new StringReader("xyx"))
{
sut.DeserializeCommand(reader, typeof(CommandHandlingSettingsTests));
}
};
act.ShouldThrowExactly<HttpProblemDetailsException<HttpProblemDetails>>()
.And.ProblemDetails.Status.Should().Be(400);
}
public CommandHandlerController(CommandHandlingSettings settings)
{
_settings = settings;
var temp = _settings.OnPredispatch ?? ((_, __) => { });
_predispatch = (metadata, headers) =>
{
metadata[CommandMessageExtensions.UserKey] = (User as ClaimsPrincipal) ?? new ClaimsPrincipal(new ClaimsIdentity());
try
{
temp(metadata, headers);
}
catch (Exception ex)
{
Logger.ErrorException("Exception occured invoking the Predispatch hook", ex);
}
};
}
public async Task Can_invoke_command_over_http()
{
// 1. Setup the middlware
var resolver = new CommandHandlerResolver(new CommandModule());
var commandMediaTypeMap = new CommandMediaTypeMap(new CommandMediaTypeWithQualifierVersionFormatter())
{
{ typeof(Command).FullName.ToLower(), typeof(Command) }
};
var settings = new CommandHandlingSettings(resolver, commandMediaTypeMap);
var middleware = CommandHandlingMiddleware.HandleCommands(settings);
// 2. Create an embedded HttpClient. This allows invoking of the
// HttpPipeline in-memory without a server / listener.
using(HttpClient client = middleware.CreateEmbeddedClient())
{
// 3. This is as close as you can get to simulating a real client call
// without needing real server.
// Can use this to do acceptance testing also.
await client.PutCommand(new Command(), Guid.NewGuid(), commandMediaTypeMap);
}
}
private static HttpConfiguration ConfigureWebApi(CommandHandlingSettings settings)
{
var container = new TinyIoCContainer();
container.Register(settings);
container.Register(new RecyclableMemoryStreamManager());
var config = new HttpConfiguration
{
DependencyResolver = new TinyIoCDependencyResolver(container)
};
config.Services.Replace(typeof(IHttpControllerTypeResolver), new CommandHandlingHttpControllerTypeResolver());
config.Filters.Add(new HttpProblemDetailsExceptionFilterAttribute(settings.MapProblemDetailsFromException));
config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Never;
config.MapHttpAttributeRoutes();
config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/problem+json"));
config.Formatters.JsonFormatter.SerializerSettings.ContractResolver =
new CamelCasePropertyNamesContractResolver();
config.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling = TypeNameHandling.None;
return config;
}
public CommandHandlerController(
CommandHandlingSettings settings,
RecyclableMemoryStreamManager recyclableMemoryStreamManager)
{
_settings = settings;
_recyclableMemoryStreamManager = recyclableMemoryStreamManager;
var temp = _settings.OnPredispatch ?? ((_, __) => { });
_predispatch = (metadata, headers) =>
{
metadata[CommandMessageExtensions.UserKey] = (User as ClaimsPrincipal) ?? new ClaimsPrincipal(new ClaimsIdentity());
try
{
temp(metadata, headers);
}
catch(Exception ex)
{
s_logger.ErrorException("Exception occured invoking the Predispatch hook", ex);
}
};
}
private static HttpConfiguration ConfigureWebApi(CommandHandlingSettings settings)
{
var container = new TinyIoCContainer();
container.Register(settings);
var config = new HttpConfiguration
{
DependencyResolver = new TinyIoCDependencyResolver(container)
};
config.Services.Replace(typeof(IHttpControllerTypeResolver), new CommandHandlingHttpControllerTypeResolver());
config.Filters.Add(new HttpProblemDetailsExceptionFilterAttribute(settings.MapProblemDetailsFromException));
config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Never;
config.MapHttpAttributeRoutes();
config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/problem+json"));
config.Formatters.JsonFormatter.SerializerSettings.ContractResolver =
new CamelCasePropertyNamesContractResolver();
config.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling = TypeNameHandling.None;
return(config);
}
public async Task Should_invoke_predispatch_hook()
{
var module = new CommandHandlerModule();
string correlationId = null;
const string correlationIdKey = "CorrelationId";
module.For<Command>().Handle((commandMessage, __) =>
{
correlationId = commandMessage.Metadata.Get<string>(correlationIdKey);
return Task.FromResult(0);
});
var commandMediaTypeMap = new CommandMediaTypeMap(new CommandMediaTypeWithQualifierVersionFormatter())
{
{ typeof(Command).Name.ToLower(), typeof(Command) }
};
var settings = new CommandHandlingSettings(new CommandHandlerResolver(module), commandMediaTypeMap)
{
OnPredispatch = (metadata, headers) =>
{
var correlationIdHeader = headers.SingleOrDefault(kvp => kvp.Key == correlationIdKey);
if(correlationIdHeader.Value != null)
{
metadata[correlationIdKey] = correlationIdHeader.Value.SingleOrDefault();
}
}
};
var midFunc = CommandHandlingMiddleware.HandleCommands(settings);
using(var client = midFunc.CreateEmbeddedClient())
{
await client.PutCommand(new Command(), Guid.NewGuid(), commandMediaTypeMap, customizeRequest: request =>
{
request.Headers.Add(correlationIdKey, "cor-1");
});
correlationId.Should().Be("cor-1");
}
}
public async Task Can_invoke_command_over_http()
{
var resolver = new CommandHandlerResolver(new CommandModule());
var commandMediaTypeMap = new CommandMediaTypeMap(new CommandMediaTypeWithQualifierVersionFormatter())
{
{ typeof(Command).FullName.ToLower(), typeof(Command) }
};
// 1. Create the serializer
var jsonSerializer = new JsonSerializer();
var settings = new CommandHandlingSettings(resolver, commandMediaTypeMap)
{
// 2. Customize the deserialization
DeserializeCommand = (commandReader, type) =>
{
using(var reader = new JsonTextReader(commandReader))
{
return jsonSerializer.Deserialize(reader, type);
}
}
};
var middleware = CommandHandlingMiddleware.HandleCommands(settings);
// 3. Customize the serialization
SerializeCommand serializeCommand = (writer, command) =>
{
jsonSerializer.Serialize(writer, command);
};
// 3. Create an embedded HttpClient. This allows invoking of the
// HttpPipeline in-memory without a server / listener.
using(HttpClient client = middleware.CreateEmbeddedClient())
{
// 3. This is as close as you can get to simulating a real client call
// without needing real server.
// Can use this to do acceptance testing also.
await client.PutCommand(new Command(), Guid.NewGuid(), commandMediaTypeMap, serializeCommand: serializeCommand);
}
}
public void When_custom_deserializer_throws_HttpProblemDetailsException_then_it_should_propagate()
{
var expected = new HttpProblemDetailsException<HttpProblemDetails>(new HttpProblemDetails());
var sut = new CommandHandlingSettings(A.Fake<ICommandHandlerResolver>(), A.Fake<ResolveCommandType>())
{
DeserializeCommand = (_, __) => { throw expected; }
};
Exception thrown = null;
try
{
using (var reader = new StringReader("xyx"))
{
sut.DeserializeCommand(reader, typeof(CommandHandlingSettingsTests));
}
}
catch(Exception ex)
{
thrown = ex;
}
thrown.Should().Be(expected);
}