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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// cSocketThreads.h
// Interfaces to the cSocketThreads class representing the heart of MCS's client networking.
// This object takes care of network communication, groups sockets into threads and uses as little threads as possible for full read / write support
// For more detail, see http://forum.mc-server.org/showthread.php?tid=327
/*
Additional details:
When a client is terminating a connection:
- they call the StopReading() method to disable callbacks for the incoming data
- they call the Write() method to queue any outstanding outgoing data
- they call the QueueClose() method to queue the socket to close after outgoing data has been sent.
When a socket slot is marked as having no callback, it is kept alive until its outgoing data queue is empty and its m_ShouldClose flag is set.
This means that the socket can be written to several times before finally closing it via QueueClose()
*/
/// How many clients should one thread handle? (must be less than FD_SETSIZE - 1 for your platform)
#define MAX_SLOTS 63
#pragma once
#ifndef CSOCKETTHREADS_H_INCLUDED
#define CSOCKETTHREADS_H_INCLUDED
#include "cSocket.h"
#include "cIsThread.h"
// Check MAX_SLOTS:
#if MAX_SLOTS >= FD_SETSIZE
#error "MAX_SLOTS must be less than FD_SETSIZE - 1 for your platform! (otherwise select() won't work)"
#endif
// fwd:
class cSocket;
class cClientHandle;
class cSocketThreads
{
public:
// Clients of cSocketThreads must implement this interface to be able to communicate
class cCallback
{
public:
/// Called when data is received from the remote party
virtual void DataReceived(const char * a_Data, int a_Size) = 0;
/// Called when data can be sent to remote party; the function is supposed to append outgoing data to a_Data
virtual void GetOutgoingData(AString & a_Data) = 0;
/// Called when the socket has been closed for any reason
virtual void SocketClosed(void) = 0;
} ;
cSocketThreads(void);
~cSocketThreads();
/// Add a (socket, client) pair for processing, data from a_Socket is to be sent to a_Client; returns true if successful
bool AddClient(cSocket * a_Socket, cCallback * a_Client);
/// Remove the socket (and associated client) from processing
void RemoveClient(const cSocket * a_Socket);
/// Remove the associated socket and the client from processing
void RemoveClient(const cCallback * a_Client);
/// Notify the thread responsible for a_Client that the client has something to write
void NotifyWrite(const cCallback * a_Client);
/// Puts a_Data into outgoing data queue for a_Socket
void Write(const cSocket * a_Socket, const AString & a_Data);
/// Stops reading from the socket - when this call returns, no more calls to the callbacks are made
void StopReading(const cCallback * a_Client);
/// Queues the socket for closing, as soon as its outgoing data is sent
void QueueClose(const cSocket * a_Socket);
private:
class cSocketThread :
public cIsThread
{
typedef cIsThread super;
public:
cSocketThread(cSocketThreads * a_Parent);
~cSocketThread();
// All these methods assume parent's m_CS is locked
bool HasEmptySlot(void) const {return m_NumSlots < MAX_SLOTS; }
bool IsEmpty (void) const {return m_NumSlots == 0; }
void AddClient (cSocket * a_Socket, cCallback * a_Client);
bool RemoveClient(const cCallback * a_Client); // Returns true if removed, false if not found
bool RemoveSocket(const cSocket * a_Socket); // Returns true if removed, false if not found
bool HasClient (const cCallback * a_Client) const;
bool HasSocket (const cSocket * a_Socket) const;
bool NotifyWrite (const cCallback * a_Client); // Returns true if client handled by this thread
bool Write (const cSocket * a_Socket, const AString & a_Data); // Returns true if socket handled by this thread
bool StopReading (const cCallback * a_Client); // Returns true if client handled by this thread
bool QueueClose (const cSocket * a_Socket); // Returns true if socket handled by this thread
bool Start(void); // Hide the cIsThread's Start method, we need to provide our own startup to create the control socket
bool IsValid(void) const {return m_ControlSocket2.IsValid(); } // If the Control socket dies, the thread is not valid anymore
private:
cSocketThreads * m_Parent;
// Two ends of the control socket, the first is select()-ed, the second is written to for notifications
cSocket m_ControlSocket1;
cSocket m_ControlSocket2;
// Socket-client-packetqueues triplets.
// Manipulation with these assumes that the parent's m_CS is locked
struct sSlot
{
cSocket * m_Socket;
cCallback * m_Client;
AString m_Outgoing; // If sending writes only partial data, the rest is stored here for another send
bool m_ShouldClose; // If true, the socket is to be closed after sending all outgoing data
} ;
sSlot m_Slots[MAX_SLOTS];
int m_NumSlots; // Number of slots actually used
virtual void Execute(void) override;
void AddOrUpdatePacket(int a_Slot, cPacket * a_Packet); // Adds the packet to the specified slot, or updates an existing packet in that queue (EntityMoveLook filtering)
void PrepareSet (fd_set * a_Set, cSocket::xSocket & a_Highest); // Puts all sockets into the set, along with m_ControlSocket1
void ReadFromSockets(fd_set * a_Read); // Reads from sockets indicated in a_Read
void WriteToSockets (fd_set * a_Write); // Writes to sockets indicated in a_Write
void RemoveClosedSockets(void); // Removes sockets that have closed from m_Slots[]
} ;
typedef std::list<cSocketThread *> cSocketThreadList;
cCriticalSection m_CS;
cSocketThreadList m_Threads;
} ;
#endif // CSOCKETTHREADS_H_INCLUDED
|
