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
|
/*
* bitz-server, An ICAP server implementation in C++
* Copyright (C) 2012 Uditha Atukorala
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "manager.h"
#include "logger.h"
#include "util.h"
#include <cstdlib>
#include <sstream>
#include <csignal>
namespace bitz {
Manager::Manager( unsigned short port, const std::string &address, int backlog ) throw( ManagerException ) {
// initialise manager
_manager.worker = false;
_manager.max_workers = 0;
_manager.max_worker_requests = 0;
_manager.comm_timeout = 0;
_manager.workers_count = 0;
_manager.worker_id = 0;
_manager.socket = NULL;
_manager.worker_pool = NULL;
// initialise listening socket
try {
// network socket address
psocksxx::nsockaddr naddr( address.c_str(), port );
_manager.socket = new psocksxx::tcpnsockstream();
_manager.socket->bind( &naddr, true );
_manager.socket->listen( backlog );
} catch ( psocksxx::sockexception &e ) {
throw ManagerException( std::string( "failed to initialise socket, " ).append( e.what() ) );
}
Logger &logger = Logger::instance();
logger.debug( "manager initialised" );
}
Manager::~Manager() {
Logger &logger = Logger::instance();
if ( _manager.worker ) {
logger.debug( "[worker] cleaning up manager" );
} else {
logger.debug( "[manager] shutting down manager" );
}
delete [] _manager.worker_pool;
delete _manager.socket;
}
void Manager::spawn( unsigned int max_workers, unsigned int max_worker_requests, unsigned int comm_timeout ) throw( ManagerException ) {
_manager.max_workers = max_workers;
_manager.max_worker_requests = max_worker_requests;
_manager.comm_timeout = comm_timeout;
_manager.worker_pool = new worker_pool_t[max_workers];
// pre-fork workers
if (! _manager.worker ) {
for ( unsigned int i = 0; i < max_workers; i++ ) {
try {
spawn_worker( i );
} catch ( ManagerException &mex ) {
throw mex;
}
}
}
}
void Manager::spawn_worker( unsigned int worker_id ) throw( ManagerException ) {
Logger &logger = Logger::instance();
pid_t worker_pid;
// create a worker child
worker_pid = fork();
if ( worker_pid == -1 ) {
throw ManagerException( "failed to create worker", true );
}
if ( worker_pid == 0 ) {
/* worker */
_manager.worker = true;
_manager.worker_id = worker_id;
_manager.worker_pool[worker_id].worker = new Worker();
_manager.worker_pool[worker_id].worker_id = worker_id;
_manager.worker_pool[worker_id].worker_pid = worker_pid;
_manager.worker_pool[worker_id].worker->run( _manager.socket, _manager.max_worker_requests, _manager.comm_timeout );
logger.info( std::string( "end of cycle, worker[" ).append( util::itoa( worker_id ) ).append( "]" ) );
delete _manager.worker_pool[worker_id].worker;
_exit( EXIT_SUCCESS );
} else {
/* manager */
logger.info( std::string( "[manager] worker spawned with pid: " ).append( util::itoa( worker_pid) ) );
_manager.workers_count++;
_manager.worker = false;
_manager.worker_pool[worker_id].worker = NULL;
_manager.worker_pool[worker_id].worker_id = worker_id;
_manager.worker_pool[worker_id].worker_pid = worker_pid;
}
}
void Manager::shutdown( bool graceful ) throw() {
// logger
Logger &logger = Logger::instance();
if ( _manager.worker ) {
logger.info( "[worker] manager shutdown request received" );
/* worker: cleanup */
delete _manager.worker_pool[_manager.worker_id].worker;
} else {
/* manager: stop all child processes */
logger.info( "[manager] shutdown request received" );
for (unsigned int i = 0; i < _manager.max_workers; i++ ) {
if ( _manager.worker_pool[i].worker_pid != 0 ) {
if ( graceful ) {
kill( _manager.worker_pool[i].worker_pid, SIGTERM );
logger.debug( std::string( "[manager] sending SIGTERM to worker[" ).append( util::itoa( i ) )
.append( "], pid: " ).append( util::itoa( _manager.worker_pool[i].worker_pid ) ) );
} else {
kill( _manager.worker_pool[i].worker_pid, SIGKILL );
logger.debug( std::string( "[manager] sending SIGKILL to worker[" ).append( util::itoa( i ) )
.append( "], pid: " ).append( util::itoa( _manager.worker_pool[i].worker_pid ) ) );
}
} else {
logger.debug( std::string( "[manager] worker[" ).append( util::itoa( i ) ).append( "] already closed" ) );
}
}
}
}
void Manager::reap_worker( pid_t worker_pid ) throw() {
// logger
Logger &logger = Logger::instance();
logger.debug( std::string( "reaping worker, pid: " ).append( util::itoa( worker_pid ) ) );
if (! _manager.worker ) {
for (unsigned int i = 0; i < _manager.max_workers; i++ ) {
if ( _manager.worker_pool[i].worker_pid == worker_pid ) {
// reap the dead worker
_manager.worker_pool[i].worker_pid = 0;
_manager.workers_count--;
// break out the loop
break;
}
}
}
}
void Manager::manager_workers() throw() {
// logger
Logger &logger = Logger::instance();
if (! _manager.worker ) {
// check the worker count
while ( _manager.workers_count != _manager.max_workers ) {
// we are missing workers, find out who
for (unsigned int i = 0; i < _manager.max_workers; i++ ) {
if ( _manager.worker_pool[i].worker_pid == 0 ) {
try {
// spawn a worker for the missing
spawn_worker( i );
} catch ( ManagerException &mex ) {
logger.warn( std::string( "[manager] failed to spawn worker[" ).append( util::itoa( i ) ).append( "], exception: ").append( mex.what() ) );
}
}
}
}
}
}
} /* end of namespace bitz */
|
