hunt.framework.middleware.MiddlewareInterface source code

1 /*
2  * Hunt - A high-level D Programming Language Web framework that encourages rapid development and clean, pragmatic design.
3  *
4  * Copyright (C) 2015-2019, HuntLabs
5  *
6  * Website: https://www.huntlabs.net/
7  *
8  * Licensed under the Apache-2.0 License.
9  *
10  */
11 
12 module hunt.framework.middleware.MiddlewareInterface;
13 
14 import hunt.framework.http.Request;
15 import hunt.framework.http.Response;
16 
17 import hunt.logging;
18 import hunt.Functions;
19 
20 import std.exception;
21 import std.format;
22 import std.traits;
23 
24 alias RouteChecker = Func2!(string, string, bool);
25 alias MiddlewareEventHandler = Func2!(MiddlewareInterface, Request, Response);
26 
27 /**
28  * 
29  */
30 interface MiddlewareInterface
31 {
32     ///get the middleware name
33     string name();
34     
35     ///return null is continue, response is close the session
36     Response onProcess(Request request, Response response = null);
37 
38     private __gshared TypeInfo_Class[string] _all;
39 
40     static void register(T)() if(is(T : MiddlewareInterface)) {
41         string simpleName = T.stringof;
42         auto itemPtr = simpleName in _all;
43         if(itemPtr !is null) {
44             warning("The middleware [%s] will be overwritten by [%s]", 
45                 itemPtr.name, T.classinfo.name);
46         }
47 
48         _all[simpleName] = T.classinfo;
49     }
50 
51     /**
52      * Simple name
53      */
54     static TypeInfo_Class get(string name) {
55         auto itemPtr = name in _all;
56         if(itemPtr is null) {
57             throw new Exception(format("The middleware %s has not been registered", name));
58         }
59 
60         return *itemPtr;
61     }
62 
63     static TypeInfo_Class[string] all() {
64         return _all;
65     }
66 
67 }
68 
69 /**
70  * 
71  */
72 abstract class AbstractMiddleware : MiddlewareInterface {
73     
74     /// get the middleware name
75     string name() {
76         return typeid(this).name;
77     }
78 }