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
|
/*
# Copyright (c) 2011 - OpenSLX Project, Computer Center University of Freiburg
#
# This program is free software distributed under the GPL version 2.
# See http://gpl.openslx.org/
#
# If you have any feedback please consult http://feedback.openslx.org/ and
# send your suggestions, praise, or complaints to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org/
*/
#include <map>
#include <unistd.h>
#include <iostream>
#include <sstream>
#include <stdio.h>
#include <string.h>
#include <libgearman/gearman.h>
#include "../version.h"
using namespace std;
int _nbd_server_port;
map<string, int> _map; // map running nbd-servers: <exported image, port number>
static void *start_nbd_server(gearman_job_st *job, void *context,
size_t *result_size, gearman_return_t *ret_ptr)
{
cout << "[DEBUG] Received request from " << gearman_job_handle(job) << endl;
if (gearman_job_workload_size(job) <= 0)
{
cerr << "[ERROR] No image given, aborting!" << endl;
return NULL;
}
// prepare data
char* req = (char*) gearman_job_workload(job);
size_t req_size = gearman_job_workload_size(job);
string *image = new string(req, req_size);
int current_port = 0;
cout << "[DEBUG] Requested image: " << *image << endl;
// test if requested image exists
int test = access(image->c_str(), 0);
if (test != 0)
{
cerr << "[ERROR] Requested image not found, aborting!" << endl;
char msg[] = "Requested image not found";
gearman_job_send_data(job, msg, sizeof(msg));
*ret_ptr = GEARMAN_WORK_FAIL;
return NULL;
}
if (_map[*image] != 0)
{
// nbd-server already running
cout << "[DEBUG] Requested nbd-server is already running on port "
<< _map[*image] << endl;
current_port = _map[*image];
}
else
{
// start new nbd-server
cout << "[DEBUG] Starting new nbd-server on port " << _nbd_server_port
<< endl;
stringstream command;
command << "nbd-server " << _nbd_server_port << " " << *image;
cout << "[DEBUG] " << "Running command: " << command.str() << endl;
system(command.str().c_str());
current_port = _nbd_server_port;
_map[*image] = _nbd_server_port;
_nbd_server_port++;
}
// send port number to client
cout << "[DEBUG] " << "Response with port number " << current_port << endl;
char buf[32];
snprintf(buf, sizeof(buf), "%d", current_port);
gearman_job_send_data(job, buf, strlen(buf));
*ret_ptr = GEARMAN_SUCCESS;
return NULL;
}
static void usage(char *name)
{
printf("usage: %s [-p] [-d] [-v]\n", name);
printf("\t-p\t first port number for nbd-servers (default: 5001)\n");
printf("\t-d\t start as daemon\n");
printf("\t-v\t print version and exit\n");
}
int main(int argc, char* argv[])
{
gearman_return_t result;
gearman_worker_st worker;
_nbd_server_port = 5001;
bool as_daemon = false;
// parse command line arguments
int c;
while ((c = getopt(argc, argv, "p:dv")) != -1)
{
switch (c)
{
case 'p':
_nbd_server_port = atoi(optarg);
break;
case 'd':
as_daemon = true;
break;
case 'v':
printf("Version: %s\n", VERSION_STRING);
exit(0);
default:
usage(argv[0]);
exit(1);
}
}
// initialize gearman worker
if (gearman_worker_create(&worker) == NULL)
{
cerr << "[ERROR] Memory allocation failure on worker creation" << endl;
exit(1);
}
result = gearman_worker_add_server(&worker, "127.0.0.1", 0);
if (result != GEARMAN_SUCCESS)
{
cerr << "[ERROR] " << gearman_worker_error(&worker) << endl;
exit(1);
}
result = gearman_worker_add_function(&worker, "start_nbd_server", 0,
start_nbd_server, NULL);
if (result != GEARMAN_SUCCESS)
{
cerr << "[ERROR] " << gearman_worker_error(&worker) << endl;
exit(1);
}
cout << "[DEBUG] Worker is ready." << endl;
if (as_daemon)
{
cout << "[DEBUG] Daemonize..." << endl;
daemon(0, 0);
}
// main loop
while (1)
{
result = gearman_worker_work(&worker);
if (result != GEARMAN_SUCCESS)
{
cerr << "[ERROR] " << gearman_worker_error(&worker) << endl;
break;
}
}
// cleanup
gearman_worker_free(&worker);
cout << "[DEBUG] Worker has been freed." << endl;
}
|
