1 /*
2  * nghttp2 - HTTP/2 C Library
3  *
4  * Copyright (c) 2015 Tatsuhiro Tsujikawa
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining
7  * a copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sublicense, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be
15  * included in all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24  */
25 #ifndef SHRPX_RATE_LIMIT_H
26 #define SHRPX_RATE_LIMIT_H
27 
28 #include "shrpx.h"
29 
30 #include <ev.h>
31 
32 #include <openssl/ssl.h>
33 
34 namespace shrpx {
35 
36 struct Connection;
37 
38 class RateLimit {
39 public:
40   // We need |conn| object to check that it has unread bytes for TLS
41   // connection.
42   RateLimit(struct ev_loop *loop, ev_io *w, size_t rate, size_t burst,
43             Connection *conn = nullptr);
44   ~RateLimit();
45   size_t avail() const;
46   void drain(size_t n);
47   void regen();
48   void startw();
49   void stopw();
50   // Feeds event if conn_->tls object has unread bytes.  This is
51   // required since it is buffered in conn_->tls object, io event is
52   // not generated unless new incoming data is received.
53   void handle_tls_pending_read();
54 
55 private:
56   ev_timer t_;
57   ev_io *w_;
58   struct ev_loop *loop_;
59   Connection *conn_;
60   size_t rate_;
61   size_t burst_;
62   size_t avail_;
63   bool startw_req_;
64 };
65 
66 } // namespace shrpx
67 
68 #endif // SHRPX_RATE_LIMIT_H
69