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
|
/**
* Copyright (c) 2018 Cornell University.
*
* Author: Ted Yin <tederminant@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include "salticidae/event.h"
#include "salticidae/network.h"
#include "salticidae/stream.h"
/** Hello Message. */
const uint8_t msg_hello_opcode = 0x0;
typedef struct MsgHello {
const char *name;
const char *text;
} MsgHello;
/** Defines how to serialize the msg. */
datastream_t msg_hello_serialize(const char *name, const char *text) {
datastream_t *serialized = msgnet_
serialized << htole((uint32_t)name.length());
serialized << name << text;
}
/** Defines how to parse the msg. */
MsgHello MsgHello(DataStream &&s) {
MsgHello res;
uint32_t len;
s >> len;
len = letoh(len);
res.name = std::string((const char *)s.get_data_inplace(len), len);
len = s.size();
res.text = std::string((const char *)s.get_data_inplace(len), len);
return res;
}
/** Acknowledgement Message. */
struct MsgAck {
static const uint8_t opcode = 0x1;
DataStream serialized;
MsgAck() {}
MsgAck(DataStream &&s) {}
};
const uint8_t MsgHello::opcode;
const uint8_t MsgAck::opcode;
using MsgNetworkByteOp = MsgNetwork<uint8_t>;
typedef struct MyNet {
msgnetwork_t *net;
const std::string name;
const NetAddr peer;
} MyNet;
void msg_hello_handler(const msg_t *msg, const msgnetwork_conn_t *conn) {
}
void msg_ack_handler(const msg_t *msg, const msgnetwork_conn_t *conn) {
}
void alice_conn_handler(const msgnetwork_conn_t *conn, bool connected) {
if (connected)
{
if (conn->get_mode() == ConnPool::Conn::ACTIVE)
{
puts("[alice] Connected, sending hello.");
/* send the first message through this connection */
msgnetwork_send_msg(alice,
msg_hello_serialize("alice", "Hello there!"), conn);
}
else
printf("[alice] Accepted, waiting for greetings.\n",
this->name.c_str());
}
else
{
printf("[alice] Disconnected, retrying.\n", this->name.c_str());
/* try to reconnect to the same address */
connect(conn->get_addr());
}
}
MyNet mynet_new(const salticidae::EventContext &ec,
const char *name,
const netaddr_t *peer) {
MyNet res;
const msgnetwork_config_t *netconfig = msgnetwork_config_new();
res.net = msgnetwork_new(ec, netconfig);
res.name = name;
res.peer = peer;
/* message handler could be a bound method */
reg_handler(salticidae::generic_bind(&MyNet::on_receive_hello, this, _1, _2));
reg_conn_handler([this](const ConnPool::conn_t &conn, bool connected) {
});
}
void on_receive_hello(MsgHello &&msg, const MyNet::conn_t &conn) {
printf("[%s] %s says %s\n",
name.c_str(),
msg.name.c_str(), msg.text.c_str());
/* send acknowledgement */
send_msg(MsgAck(), conn);
}
};
void on_receive_ack(MsgAck &&msg, const MyNet::conn_t &conn) {
auto net = static_cast<MyNet *>(conn->get_net());
printf("[%s] the peer knows\n", net->name.c_str());
}
int main() {
salticidae::EventContext ec;
NetAddr alice_addr("127.0.0.1:12345");
NetAddr bob_addr("127.0.0.1:12346");
/* test two nodes in the same main loop */
MyNet alice(ec, "Alice", bob_addr);
MyNet bob(ec, "Bob", alice_addr);
/* message handler could be a normal function */
alice.reg_handler(on_receive_ack);
bob.reg_handler(on_receive_ack);
/* start all threads */
alice.start();
bob.start();
/* accept incoming connections */
alice.listen(alice_addr);
bob.listen(bob_addr);
/* try to connect once */
alice.connect(bob_addr);
bob.connect(alice_addr);
/* the main loop can be shutdown by ctrl-c or kill */
auto shutdown = [&](int) {ec.stop();};
salticidae::SigEvent ev_sigint(ec, shutdown);
salticidae::SigEvent ev_sigterm(ec, shutdown);
ev_sigint.add(SIGINT);
ev_sigterm.add(SIGTERM);
/* enter the main loop */
ec.dispatch();
return 0;
}
|