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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include <stdlib.h>
#include <string.h>
#include "core/nng_impl.h"
// Pair protocol. The PAIR protocol is a simple 1:1 messaging pattern.
// While a peer is connected to the server, all other peer connection
// attempts are discarded.
typedef struct nni_pair_pipe nni_pair_pipe;
typedef struct nni_pair_sock nni_pair_sock;
// An nni_pair_sock is our per-socket protocol private structure.
struct nni_pair_sock {
nni_sock * nsock;
nni_pair_pipe * ppipe;
nni_msgq * uwq;
nni_msgq * urq;
int raw;
};
// An nni_pair_pipe is our per-pipe protocol private structure. We keep
// one of these even though in theory we'd only have a single underlying
// pipe. The separate data structure is more like other protocols that do
// manage multiple pipes.
struct nni_pair_pipe {
nni_pipe * npipe;
nni_pair_sock * psock;
int sigclose;
};
static void nni_pair_receiver(void *);
static void nni_pair_sender(void *);
static int
nni_pair_sock_init(void **sp, nni_sock *nsock)
{
nni_pair_sock *psock;
if ((psock = NNI_ALLOC_STRUCT(psock)) == NULL) {
return (NNG_ENOMEM);
}
psock->nsock = nsock;
psock->ppipe = NULL;
psock->raw = 0;
psock->uwq = nni_sock_sendq(nsock);
psock->urq = nni_sock_recvq(nsock);
*sp = psock;
return (0);
}
static void
nni_pair_sock_fini(void *arg)
{
nni_pair_sock *psock = arg;
if (psock != NULL) {
NNI_FREE_STRUCT(psock);
}
}
static int
nni_pair_pipe_init(void **pp, nni_pipe *npipe, void *psock)
{
nni_pair_pipe *ppipe;
if ((ppipe = NNI_ALLOC_STRUCT(ppipe)) == NULL) {
return (NNG_ENOMEM);
}
ppipe->npipe = npipe;
ppipe->sigclose = 0;
ppipe->psock = psock;
*pp = ppipe;
return (0);
}
static void
nni_pair_pipe_fini(void *arg)
{
nni_pair_pipe *ppipe = arg;
if (ppipe != NULL) {
NNI_FREE_STRUCT(ppipe);
}
}
static int
nni_pair_pipe_add(void *arg)
{
nni_pair_pipe *ppipe = arg;
nni_pair_sock *psock = ppipe->psock;
if (psock->ppipe != NULL) {
return (NNG_EBUSY); // Already have a peer, denied.
}
psock->ppipe = ppipe;
return (0);
}
static void
nni_pair_pipe_rem(void *arg)
{
nni_pair_pipe *ppipe = arg;
nni_pair_sock *psock = ppipe->psock;
if (psock->ppipe == ppipe) {
psock->ppipe = NULL;
}
}
static void
nni_pair_pipe_send(void *arg)
{
nni_pair_pipe *ppipe = arg;
nni_pair_sock *psock = ppipe->psock;
nni_msgq *uwq = psock->uwq;
nni_msgq *urq = psock->urq;
nni_pipe *npipe = ppipe->npipe;
nni_msg *msg;
int rv;
for (;;) {
rv = nni_msgq_get_sig(uwq, &msg, &ppipe->sigclose);
if (rv != 0) {
break;
}
rv = nni_pipe_send(npipe, msg);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgq_signal(urq, &ppipe->sigclose);
nni_pipe_close(npipe);
}
static void
nni_pair_pipe_recv(void *arg)
{
nni_pair_pipe *ppipe = arg;
nni_msgq *urq = ppipe->psock->urq;
nni_msgq *uwq = ppipe->psock->uwq;
nni_pipe *npipe = ppipe->npipe;
nni_msg *msg;
int rv;
for (;;) {
rv = nni_pipe_recv(npipe, &msg);
if (rv != 0) {
break;
}
rv = nni_msgq_put_sig(urq, msg, &ppipe->sigclose);
if (rv != 0) {
nni_msg_free(msg);
break;
}
}
nni_msgq_signal(uwq, &ppipe->sigclose);
nni_pipe_close(npipe);
}
static int
nni_pair_sock_setopt(void *arg, int opt, const void *buf, size_t sz)
{
nni_pair_sock *psock = arg;
int rv;
switch (opt) {
case NNG_OPT_RAW:
rv = nni_setopt_int(&psock->raw, buf, sz, 0, 1);
break;
default:
rv = NNG_ENOTSUP;
}
return (rv);
}
static int
nni_pair_sock_getopt(void *arg, int opt, void *buf, size_t *szp)
{
nni_pair_sock *psock = arg;
int rv;
switch (opt) {
case NNG_OPT_RAW:
rv = nni_getopt_int(&psock->raw, buf, szp);
break;
default:
rv = NNG_ENOTSUP;
}
return (rv);
}
// This is the global protocol structure -- our linkage to the core.
// This should be the only global non-static symbol in this file.
static nni_proto_pipe_ops nni_pair_pipe_ops = {
.pipe_init = nni_pair_pipe_init,
.pipe_fini = nni_pair_pipe_fini,
.pipe_add = nni_pair_pipe_add,
.pipe_rem = nni_pair_pipe_rem,
.pipe_worker = { nni_pair_pipe_send,
nni_pair_pipe_recv },
};
static nni_proto_sock_ops nni_pair_sock_ops = {
.sock_init = nni_pair_sock_init,
.sock_fini = nni_pair_sock_fini,
.sock_setopt = nni_pair_sock_setopt,
.sock_getopt = nni_pair_sock_getopt,
};
nni_proto nni_pair_proto = {
.proto_self = NNG_PROTO_PAIR,
.proto_peer = NNG_PROTO_PAIR,
.proto_name = "pair",
.proto_sock_ops = &nni_pair_sock_ops,
.proto_pipe_ops = &nni_pair_pipe_ops,
};
|
