使用.NET6实现动态API

static class ServiceExtension
{
    internal static WebApplicationBuilder AddKApp(this WebApplicationBuilder builder, Action<AppOption>? action = null)
    {
        var option = new AppOption();
        action?.Invoke(option);
        ...
        AddDynamicApi(mvcBuilder, option);//添加动态api
        return builder;
    }
 
    private static void AddDynamicApi(IMvcBuilder builder, AppOption option)
    {
        builder.ConfigureApplicationPartManager(m =>
        {
            m.ApplicationParts.Add(new AssemblyPart(typeof(IService).Assembly));
            foreach (var item in option.Modules)
            {
                item.Initialize();//初始化模块
                //将模块添加到ApplicationParts，这样才能发现服务类
                var assembly = item.GetType().Assembly;
                m.ApplicationParts.Add(new AssemblyPart(assembly));
            }
            m.FeatureProviders.Add(new ApiFeatureProvider());
        });
 
        builder.Services.Configure<MvcOptions>(o =>
        {
            o.Conventions.Add(new ApiConvention());
        });
    }
}
 
//判断服务类型是否为Controller
class ApiFeatureProvider : ControllerFeatureProvider
{
    protected override bool IsController(TypeInfo typeInfo)
    {
        if (!typeof(IService).IsAssignableFrom(typeInfo) ||
            !typeInfo.IsPublic ||
            typeInfo.IsAbstract ||
            typeInfo.IsGenericType)
            return false;
 
        return true;
    }
}
 
class ApiConvention : IApplicationModelConvention
{
    public void Apply(ApplicationModel application)
    {
        foreach (var controller in application.Controllers)
        {
            var type = controller.ControllerType;
            if (typeof(IService).IsAssignableFrom(type))
            {
                ConfigureApiExplorer(controller);
                ConfigureSelector(controller);
            }
        }
    }
 
    ...
 
    //构造路由模板
    private string GetRouteTemplate(ActionModel action)
    {
        if (action.Attributes != null && action.Attributes.Count > 0)
        {
            foreach (var item in action.Attributes)
            {
                if (item is RouteAttribute attribute)
                {
                    return attribute.Path;//返回自定义路由
                }
            }
        }
 
        var routeTemplate = new StringBuilder();
        //routeTemplate.Append("api");
        var names = action.Controller.ControllerType.Namespace.Split('.');
        if (names.Length > 2)
        {
            //支持不同模块相同类名，添加命名空间模块名作前缀
            routeTemplate.Append(names[^2]);
        }
 
        // Controller
        var controllerName = action.Controller.ControllerName;
        if (controllerName.EndsWith("Service"))
            controllerName = controllerName[0..^7];
 
        routeTemplate.Append($"/{controllerName}");
 
        // Action
        var actionName = action.ActionName;
        if (actionName.EndsWith("Async"))
            actionName = actionName[..^"Async".Length];
 
        if (!string.IsNullOrEmpty(actionName))
            routeTemplate.Append($"/{actionName}");
 
        return routeTemplate.ToString();
    }
}

KHost.Run(args, o =>
{
    o.Modules.Add(new TestModule());//添加模块
});
 
class TestModule : IModule
{
    public void Initialize()
    {
    }
}
 
public class TestService : IService
{
    public string GetName(string name)
    {
        return $"Hello {name}";
    }
 
    public string SaveData(string data)
    {
        return $"{DateTime.Now:yyyy-MM-dd HH:mm:ss} {data}";
    }
 
    [Route("api/test")]
    public string GetCustMethod(string id)
    {
        return id;
    }
}