blob: f9d50de24bd289c84dc1f03a42ce0c5cf178ee02 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#pragma once
#include "cmConfigure.h" // IWYU pragma: keep
#include "cm_uv.h"
#include <cstddef>
#include <memory>
#include <string>
class cmServerBase;
/***
* Given a sequence of bytes with any kind of buffering, instances of this
* class arrange logical chunks according to whatever the use case is for
* the connection.
*/
class cmConnectionBufferStrategy
{
public:
virtual ~cmConnectionBufferStrategy();
/***
* Called whenever with an active raw buffer. If a logical chunk
* becomes available, that chunk is returned and that portion is
* removed from the rawBuffer
*
* @param rawBuffer in/out parameter. Receive buffer; the buffer strategy is
* free to manipulate this buffer anyway it needs to.
*
* @return Next chunk from the stream. Returns the empty string if a chunk
* isn't ready yet. Users of this interface should repeatedly call this
* function until an empty string is returned since its entirely possible
* multiple chunks come in a single raw buffer.
*/
virtual std::string BufferMessage(std::string& rawBuffer) = 0;
/***
* Resets the internal state of the buffering
*/
virtual void clear();
// TODO: There should be a callback / flag set for errors
};
class cmConnection
{
CM_DISABLE_COPY(cmConnection)
public:
cmConnection() {}
virtual void WriteData(const std::string& data) = 0;
virtual ~cmConnection();
virtual bool OnConnectionShuttingDown();
virtual bool IsOpen() const = 0;
virtual void SetServer(cmServerBase* s);
virtual void ProcessRequest(const std::string& request);
virtual bool OnServeStart(std::string* pString);
protected:
cmServerBase* Server = nullptr;
};
/***
* Abstraction of a connection; ties in event callbacks from libuv and notifies
* the server when appropriate
*/
class cmEventBasedConnection : public cmConnection
{
public:
/***
* @param bufferStrategy If no strategy is given, it will process the raw
* chunks as they come in. The connection
* owns the pointer given.
*/
cmEventBasedConnection(cmConnectionBufferStrategy* bufferStrategy = nullptr);
virtual void Connect(uv_stream_t* server);
virtual void ReadData(const std::string& data);
bool IsOpen() const override;
void WriteData(const std::string& data) override;
bool OnConnectionShuttingDown() override;
virtual void OnDisconnect(int errorCode);
uv_stream_t* ReadStream = nullptr;
uv_stream_t* WriteStream = nullptr;
static void on_close(uv_handle_t* handle);
static void on_close_delete(uv_handle_t* handle);
protected:
std::string RawReadBuffer;
std::unique_ptr<cmConnectionBufferStrategy> BufferStrategy;
static void on_read(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf);
static void on_write(uv_write_t* req, int status);
static void on_new_connection(uv_stream_t* stream, int status);
static void on_alloc_buffer(uv_handle_t* handle, size_t suggested_size,
uv_buf_t* buf);
};
|
