moonbridge

annotate moonbridge.c @ 326:4379766473ec

Fixed proper errno handling for blocking I/O in localconnect function for connecting to sockets
author jbe
date Tue Jun 23 12:25:58 2020 +0200 (3 months ago)
parents 2807fdd2f8d5
children
rev   line source
jbe@58 1
jbe@58 2 /*** Version ***/
jbe@229 3 #define MOONBR_VERSION_STRING "1.0.1"
jbe@58 4
jbe@0 5
jbe@0 6 /*** Compile-time configuration ***/
jbe@0 7
jbe@0 8 #define MOONBR_LUA_PANIC_BUG_WORKAROUND 1
jbe@0 9
jbe@0 10
jbe@0 11 /*** C preprocessor macros for portability support ***/
jbe@0 12
jbe@0 13 #ifndef __has_include
jbe@0 14 #define __has_include(x) 0
jbe@0 15 #endif
jbe@0 16
jbe@0 17
jbe@0 18 /*** Include directives for used system libraries ***/
jbe@0 19
jbe@0 20 #include <stdlib.h>
jbe@0 21 #include <stdint.h>
jbe@135 22 #include <string.h>
jbe@0 23 #include <errno.h>
jbe@135 24 #include <unistd.h>
jbe@135 25 #include <signal.h>
jbe@135 26 #include <sys/wait.h>
jbe@135 27 #include <sys/resource.h>
jbe@135 28 #include <poll.h>
jbe@136 29 #include <time.h>
jbe@0 30 #include <sys/time.h>
jbe@0 31 #include <sys/socket.h>
jbe@0 32 #include <sys/un.h>
jbe@0 33 #include <netinet/in.h>
jbe@125 34 #include <netdb.h>
jbe@125 35 #include <arpa/inet.h>
jbe@135 36 #include <getopt.h>
jbe@0 37 #include <sys/file.h>
jbe@135 38 #include <syslog.h>
jbe@0 39 #if defined(__FreeBSD__) || __has_include(<libutil.h>)
jbe@0 40 #include <libutil.h>
jbe@0 41 #endif
jbe@0 42 #if defined(__linux__) || __has_include(<bsd/libutil.h>)
jbe@0 43 #include <bsd/libutil.h>
jbe@0 44 #endif
jbe@0 45 #if defined(__linux__) || __has_include(<bsd/unistd.h>)
jbe@0 46 #include <bsd/unistd.h>
jbe@0 47 #endif
jbe@0 48
jbe@0 49
jbe@0 50 /*** Fallback definitions for missing constants on some platforms ***/
jbe@0 51
jbe@0 52 /* INFTIM is used as timeout parameter for poll() */
jbe@0 53 #ifndef INFTIM
jbe@0 54 #define INFTIM -1
jbe@0 55 #endif
jbe@0 56
jbe@0 57
jbe@0 58 /*** Include directives for Lua ***/
jbe@0 59
jbe@0 60 #include <lua.h>
jbe@0 61 #include <lauxlib.h>
jbe@0 62 #include <lualib.h>
jbe@0 63
jbe@0 64
jbe@79 65 /*** Include directive for moonbridge_io library ***/
jbe@79 66
jbe@79 67 #include "moonbridge_io.h"
jbe@79 68
jbe@79 69
jbe@0 70 /*** Constants ***/
jbe@0 71
jbe@0 72 /* Backlog option for listen() call */
jbe@0 73 #define MOONBR_LISTEN_BACKLOG 1024
jbe@0 74
jbe@0 75 /* Maximum length of a timestamp used for strftime() */
jbe@0 76 #define MOONBR_LOG_MAXTIMELEN 40
jbe@0 77
jbe@0 78 /* Maximum length of a log message */
jbe@0 79 #define MOONBR_LOG_MAXMSGLEN 4095
jbe@0 80
jbe@0 81 /* Exitcodes passed to exit() call */
jbe@0 82 #define MOONBR_EXITCODE_GRACEFUL 0
jbe@0 83 #define MOONBR_EXITCODE_CMDLINEERROR 1
jbe@0 84 #define MOONBR_EXITCODE_ALREADYRUNNING 2
jbe@0 85 #define MOONBR_EXITCODE_STARTUPERROR 3
jbe@0 86 #define MOONBR_EXITCODE_RUNTIMEERROR 4
jbe@0 87
jbe@0 88 /* Maximum length of a line sent to stderr by child processes */
jbe@0 89 #define MOONBR_MAXERRORLINELEN 1024
jbe@0 90
jbe@0 91 /* Maximum length of an error string returned by strerror() */
jbe@0 92 #define MOONBR_MAXSTRERRORLEN 80
jbe@0 93
jbe@213 94 /* Error message for noncompliant strerror_r() implementation on GNU systems */
jbe@213 95 #define MOONBR_STRERROR_R_MSG "Error detail unavailable due to noncompliant strerror_r() implementation"
jbe@213 96
jbe@0 97 /* Status bytes exchanged between master and child processes */
jbe@124 98 #define MOONBR_STATUS_IDLE 'I'
jbe@124 99 #define MOONBR_COMMAND_CONNECT 'C'
jbe@124 100 #define MOONBR_COMMAND_TERMINATE 'T'
jbe@124 101 #define MOONBR_STATUS_GOODBYE 'B'
jbe@0 102
jbe@0 103 /* Constant file descriptors */
jbe@0 104 #define MOONBR_FD_STDERR 2
jbe@0 105 #define MOONBR_FD_CONTROL 3
jbe@0 106 #define MOONBR_FD_END 4
jbe@0 107
jbe@0 108 /* Return values of moonbr_try_destroy_worker() */
jbe@0 109 #define MOONBR_DESTROY_NONE 0
jbe@0 110 #define MOONBR_DESTROY_PREPARE 1
jbe@0 111 #define MOONBR_DESTROY_IDLE_OR_ASSIGNED 2
jbe@0 112
jbe@0 113
jbe@0 114 /*** Types ***/
jbe@0 115
jbe@0 116 /* Enum for 'moonbr_pstate' */
jbe@0 117 #define MOONBR_PSTATE_STARTUP 0
jbe@0 118 #define MOONBR_PSTATE_RUNNING 1
jbe@0 119 #define MOONBR_PSTATE_FORKED 2
jbe@0 120
jbe@0 121 /* Enum for 'proto' field of struct moonbr_listener */
jbe@274 122 #define MOONBR_PROTO_INTERVAL 1
jbe@274 123 #define MOONBR_PROTO_LOCAL 2
jbe@274 124 #define MOONBR_PROTO_TCP 3
jbe@0 125
jbe@0 126 /* Data structure for a pool's listener that can accept incoming connections */
jbe@0 127 struct moonbr_listener {
jbe@0 128 struct moonbr_pool *pool;
jbe@0 129 struct moonbr_listener *prev_listener; /* previous idle or(!) connected listener */
jbe@0 130 struct moonbr_listener *next_listener; /* next idle or(!) connected listener */
jbe@0 131 int proto;
jbe@0 132 union {
jbe@0 133 struct {
jbe@0 134 char *name; /* name of interval passed to 'connect' function as 'interval' field in table */
jbe@274 135 int main; /* nonzero = termination of 'connect' function causes shutdown */
jbe@0 136 int strict; /* nonzero = runtime of 'connect' function does not delay interval */
jbe@0 137 struct timeval delay; /* interval between invocations of 'connect' function */
jbe@0 138 struct timeval wakeup; /* point in time of next invocation */
jbe@0 139 } interval;
jbe@0 140 struct {
jbe@125 141 union {
jbe@125 142 struct sockaddr addr_abstract;
jbe@125 143 struct sockaddr_un addr_un;
jbe@125 144 struct sockaddr_in addr_in;
jbe@125 145 struct sockaddr_in6 addr_in6;
jbe@125 146 } addr;
jbe@125 147 socklen_t addrlen;
jbe@125 148 } socket;
jbe@125 149 } type_specific;
jbe@125 150 union {
jbe@0 151 struct {
jbe@125 152 char ip[INET6_ADDRSTRLEN]; /* IP to listen on */
jbe@0 153 int port; /* port number to listen on (in host endianess) */
jbe@0 154 } tcp;
jbe@0 155 } proto_specific;
jbe@0 156 int listenfd; /* -1 = none */
jbe@0 157 int pollidx; /* -1 = none */
jbe@0 158 };
jbe@0 159
jbe@0 160 /* Data structure for a child process that is handling incoming connections */
jbe@0 161 struct moonbr_worker {
jbe@0 162 struct moonbr_pool *pool;
jbe@0 163 struct moonbr_worker *prev_worker;
jbe@0 164 struct moonbr_worker *next_worker;
jbe@0 165 struct moonbr_worker *prev_idle_worker;
jbe@0 166 struct moonbr_worker *next_idle_worker;
jbe@127 167 int main; /* nonzero = terminate Moonbridge when this worker dies */
jbe@0 168 int idle; /* nonzero = waiting for command from parent process */
jbe@0 169 int assigned; /* nonzero = currently handling a connection */
jbe@0 170 pid_t pid;
jbe@0 171 int controlfd; /* socket to send/receive control message to/from child process */
jbe@0 172 int errorfd; /* socket to receive error output from child process' stderr */
jbe@0 173 char *errorlinebuf; /* optional buffer for collecting stderr data from child process */
jbe@0 174 int errorlinelen; /* number of bytes stored in 'errorlinebuf' */
jbe@0 175 int errorlineovf; /* nonzero = line length overflow */
jbe@0 176 struct timeval idle_expiration; /* point in time until child process may stay in idle state */
jbe@0 177 struct moonbr_listener *restart_interval_listener; /* set while interval listener is assigned */
jbe@0 178 };
jbe@0 179
jbe@0 180 /* Data structure for a pool of workers and listeners */
jbe@0 181 struct moonbr_pool {
jbe@0 182 int poolnum; /* number of pool for log output */
jbe@0 183 struct moonbr_pool *next_pool; /* next entry in linked list starting with 'moonbr_first_pool' */
jbe@0 184 struct moonbr_worker *first_worker; /* first worker of pool */
jbe@0 185 struct moonbr_worker *last_worker; /* last worker of pool */
jbe@0 186 struct moonbr_worker *first_idle_worker; /* first idle worker of pool */
jbe@0 187 struct moonbr_worker *last_idle_worker; /* last idle worker of pool */
jbe@0 188 int idle_worker_count;
jbe@0 189 int unassigned_worker_count;
jbe@0 190 int total_worker_count;
jbe@0 191 int worker_count_stat; /* only needed for statistics */
jbe@0 192 int pre_fork; /* desired minimum number of unassigned workers */
jbe@0 193 int min_fork; /* desired minimum number of workers in total */
jbe@0 194 int max_fork; /* maximum number of workers */
jbe@0 195 struct timeval fork_delay; /* delay after each fork() until a fork may happen again */
jbe@0 196 struct timeval fork_wakeup; /* point in time when a fork may happen again (unless a worker terminates before) */
jbe@0 197 struct timeval fork_error_delay; /* delay between fork()s when an error during fork or preparation occurred */
jbe@0 198 struct timeval fork_error_wakeup; /* point in time when fork may happen again if an error in preparation occurred */
jbe@0 199 int use_fork_error_wakeup; /* nonzero = error in preparation occured; gets reset on next fork */
jbe@0 200 struct timeval exit_delay; /* delay for terminating excessive workers (unassigned_worker_count > pre_fork) */
jbe@0 201 struct timeval exit_wakeup; /* point in time when terminating an excessive worker */
jbe@0 202 struct timeval idle_timeout; /* delay before an idle worker is terminated */
jbe@0 203 size_t memory_limit; /* maximum bytes of memory that the Lua machine may allocate */
jbe@0 204 int listener_count; /* total number of listeners of pool (and size of 'listener' array at end of this struct) */
jbe@0 205 struct moonbr_listener *first_idle_listener; /* first listener that is idle (i.e. has no waiting connection) */
jbe@0 206 struct moonbr_listener *last_idle_listener; /* last listener that is idle (i.e. has no waiting connection) */
jbe@0 207 struct moonbr_listener *first_connected_listener; /* first listener that has a pending connection */
jbe@0 208 struct moonbr_listener *last_connected_listener; /* last listener that has a pending connection */
jbe@0 209 struct moonbr_listener listener[1]; /* static array of variable(!) size to contain 'listener' structures */
jbe@0 210 };
jbe@0 211
jbe@0 212 /* Enum for 'channel' field of struct moonbr_poll_worker */
jbe@0 213 #define MOONBR_POLL_WORKER_CONTROLCHANNEL 1
jbe@0 214 #define MOONBR_POLL_WORKER_ERRORCHANNEL 2
jbe@0 215
jbe@0 216 /* Structure to refer from 'moonbr_poll_worker_fds' entry to worker structure */
jbe@0 217 struct moonbr_poll_worker {
jbe@0 218 struct moonbr_worker *worker;
jbe@0 219 int channel; /* field indicating whether file descriptor is 'controlfd' or 'errorfd' */
jbe@0 220 };
jbe@0 221
jbe@0 222 /* Variable indicating that clean shutdown was requested */
jbe@0 223 static int moonbr_shutdown_in_progress = 0;
jbe@0 224
jbe@0 225
jbe@0 226 /*** Macros for Lua registry ***/
jbe@0 227
jbe@0 228 /* Lightuserdata keys for Lua registry to store 'prepare', 'connect', and 'finish' functions */
jbe@0 229 #define moonbr_luakey_prepare_func(pool) ((void *)(intptr_t)(pool) + 0)
jbe@0 230 #define moonbr_luakey_connect_func(pool) ((void *)(intptr_t)(pool) + 1)
jbe@0 231 #define moonbr_luakey_finish_func(pool) ((void *)(intptr_t)(pool) + 2)
jbe@0 232
jbe@0 233
jbe@0 234 /*** Global variables ***/
jbe@0 235
jbe@0 236 /* State of process execution */
jbe@0 237 static int moonbr_pstate = MOONBR_PSTATE_STARTUP;
jbe@0 238
jbe@0 239 /* Process ID of the main process */
jbe@0 240 static pid_t moonbr_masterpid;
jbe@0 241
jbe@0 242 /* Condition variables set by the signal handler */
jbe@0 243 static volatile sig_atomic_t moonbr_cond_poll = 0;
jbe@0 244 static volatile sig_atomic_t moonbr_cond_terminate = 0;
jbe@0 245 static volatile sig_atomic_t moonbr_cond_interrupt = 0;
jbe@0 246 static volatile sig_atomic_t moonbr_cond_child = 0;
jbe@0 247
jbe@0 248 /* Socket pair to denote signal delivery when signal handler was called just before poll() */
jbe@0 249 static int moonbr_poll_signalfds[2];
jbe@0 250 #define moonbr_poll_signalfd_read moonbr_poll_signalfds[0]
jbe@0 251 #define moonbr_poll_signalfd_write moonbr_poll_signalfds[1]
jbe@0 252
jbe@0 253 /* Global variables for pidfile and logging */
jbe@0 254 static struct pidfh *moonbr_pidfh = NULL;
jbe@0 255 static FILE *moonbr_logfile = NULL;
jbe@0 256 static int moonbr_use_syslog = 0;
jbe@0 257
jbe@0 258 /* First and last entry of linked list of all created pools during initialization */
jbe@0 259 static struct moonbr_pool *moonbr_first_pool = NULL;
jbe@0 260 static struct moonbr_pool *moonbr_last_pool = NULL;
jbe@0 261
jbe@0 262 /* Total count of pools */
jbe@0 263 static int moonbr_pool_count = 0;
jbe@0 264
jbe@0 265 /* Set to a nonzero value if dynamic part of 'moonbr_poll_fds' ('moonbr_poll_worker_fds') needs an update */
jbe@0 266 static int moonbr_poll_refresh_needed = 0;
jbe@0 267
jbe@0 268 /* Array passed to poll(), consisting of static part and dynamic part ('moonbr_poll_worker_fds') */
jbe@0 269 static struct pollfd *moonbr_poll_fds = NULL; /* the array */
jbe@0 270 static int moonbr_poll_fds_bufsize = 0; /* memory allocated for this number of elements */
jbe@0 271 static int moonbr_poll_fds_count = 0; /* total number of elements */
jbe@0 272 static int moonbr_poll_fds_static_count; /* number of elements in static part */
jbe@0 273
jbe@0 274 /* Dynamic part of 'moonbr_poll_fds' array */
jbe@0 275 #define moonbr_poll_worker_fds (moonbr_poll_fds+moonbr_poll_fds_static_count)
jbe@0 276
jbe@0 277 /* Additional information for dynamic part of 'moonbr_poll_fds' array */
jbe@0 278 struct moonbr_poll_worker *moonbr_poll_workers; /* the array */
jbe@0 279 static int moonbr_poll_workers_bufsize = 0; /* memory allocated for this number of elements */
jbe@0 280 static int moonbr_poll_worker_count = 0; /* number of elements in array */
jbe@0 281
jbe@0 282 /* Variable set to nonzero value to disallow further calls of 'listen' function */
jbe@0 283 static int moonbr_booted = 0;
jbe@0 284
jbe@0 285 /* Verbosity settings */
jbe@0 286 static int moonbr_debug = 0;
jbe@0 287 static int moonbr_stat = 0;
jbe@0 288
jbe@0 289 /* Memory consumption by Lua machine */
jbe@0 290 static size_t moonbr_memory_usage = 0;
jbe@0 291 static size_t moonbr_memory_limit = 0;
jbe@0 292
jbe@0 293
jbe@0 294 /*** Functions for signal handling ***/
jbe@0 295
jbe@0 296 /* Signal handler for master and child processes */
jbe@0 297 static void moonbr_signal(int sig) {
jbe@265 298 int errno2 = errno; /* backup errno variable */
jbe@0 299 if (getpid() == moonbr_masterpid) {
jbe@0 300 /* master process */
jbe@0 301 switch (sig) {
jbe@0 302 case SIGHUP:
jbe@0 303 case SIGINT:
jbe@0 304 /* fast shutdown requested */
jbe@0 305 moonbr_cond_interrupt = 1;
jbe@0 306 break;
jbe@0 307 case SIGTERM:
jbe@0 308 /* clean shutdown requested */
jbe@0 309 moonbr_cond_terminate = 1;
jbe@0 310 break;
jbe@0 311 case SIGCHLD:
jbe@0 312 /* child process terminated */
jbe@0 313 moonbr_cond_child = 1;
jbe@0 314 break;
jbe@0 315 }
jbe@0 316 if (moonbr_cond_poll) {
jbe@0 317 /* avoid race condition if signal handler is invoked right before poll() */
jbe@0 318 char buf[1] = {0};
jbe@20 319 write(moonbr_poll_signalfd_write, buf, 1);
jbe@0 320 }
jbe@0 321 } else {
jbe@0 322 /* child process forwards certain signals to parent process */
jbe@0 323 switch (sig) {
jbe@0 324 case SIGHUP:
jbe@0 325 case SIGINT:
jbe@0 326 kill(moonbr_masterpid, sig);
jbe@0 327 }
jbe@0 328 }
jbe@265 329 errno = errno2; /* restore errno from backup */
jbe@0 330 }
jbe@0 331
jbe@0 332 /* Initialize signal handling */
jbe@0 333 static void moonbr_signal_init(){
jbe@0 334 moonbr_masterpid = getpid();
jbe@0 335 signal(SIGHUP, moonbr_signal);
jbe@0 336 signal(SIGINT, moonbr_signal);
jbe@0 337 signal(SIGTERM, moonbr_signal);
jbe@0 338 signal(SIGCHLD, moonbr_signal);
jbe@0 339 }
jbe@0 340
jbe@0 341
jbe@0 342 /*** Functions for logging in master process ***/
jbe@0 343
jbe@0 344 /* Logs a pre-formatted message with given syslog() priority */
jbe@0 345 static void moonbr_log_msg(int priority, const char *msg) {
jbe@0 346 if (moonbr_logfile) {
jbe@0 347 /* logging to logfile desired (timestamp is prepended in that case) */
jbe@0 348 time_t now_time = 0;
jbe@0 349 struct tm now_tmstruct;
jbe@0 350 char timestr[MOONBR_LOG_MAXTIMELEN+1];
jbe@0 351 time(&now_time);
jbe@0 352 localtime_r(&now_time, &now_tmstruct);
jbe@0 353 if (!strftime(
jbe@0 354 timestr, MOONBR_LOG_MAXTIMELEN+1, "%Y-%m-%d %H:%M:%S %Z: ", &now_tmstruct
jbe@0 355 )) timestr[0] = 0;
jbe@0 356 fprintf(moonbr_logfile, "%s%s\n", timestr, msg);
jbe@0 357 }
jbe@0 358 if (moonbr_use_syslog) {
jbe@0 359 /* logging through syslog desired */
jbe@0 360 syslog(priority, "%s", msg);
jbe@0 361 }
jbe@0 362 }
jbe@0 363
jbe@0 364 /* Formats a message via vsnprintf() and logs it with given syslog() priority */
jbe@0 365 static void moonbr_log(int priority, const char *message, ...) {
jbe@0 366 char msgbuf[MOONBR_LOG_MAXMSGLEN+1]; /* buffer of static size to store formatted message */
jbe@0 367 int msglen; /* length of full message (may exceed MOONBR_LOG_MAXMSGLEN) */
jbe@0 368 {
jbe@0 369 /* pass variable arguments to vsnprintf() to format message */
jbe@0 370 va_list ap;
jbe@0 371 va_start(ap, message);
jbe@0 372 msglen = vsnprintf(msgbuf, MOONBR_LOG_MAXMSGLEN+1, message, ap);
jbe@0 373 va_end(ap);
jbe@0 374 }
jbe@0 375 {
jbe@0 376 /* split and log message line by line */
jbe@0 377 char *line = msgbuf;
jbe@0 378 while (1) {
jbe@0 379 char *endptr = strchr(line, '\n');
jbe@0 380 if (endptr) {
jbe@0 381 /* terminate string where newline character is found */
jbe@0 382 *endptr = 0;
jbe@0 383 } else if (line != msgbuf && msglen > MOONBR_LOG_MAXMSGLEN) {
jbe@0 384 /* break if line is incomplete and not the first line */
jbe@0 385 break;
jbe@0 386 }
jbe@0 387 moonbr_log_msg(priority, line);
jbe@0 388 if (!endptr) break; /* break if end of formatted message is reached */
jbe@0 389 line = endptr+1; /* otherwise continue with remaining message */
jbe@0 390 }
jbe@0 391 }
jbe@0 392 if (msglen > MOONBR_LOG_MAXMSGLEN) {
jbe@0 393 /* print warning if message was truncated */
jbe@0 394 moonbr_log_msg(priority, "Previous log message has been truncated due to excessive length");
jbe@0 395 }
jbe@0 396 }
jbe@0 397
jbe@0 398
jbe@0 399 /*** Termination function ***/
jbe@0 400
jbe@0 401 /* Kill all child processes, remove PID file (if existent), and exit master process with given exitcode */
jbe@0 402 static void moonbr_terminate(int exitcode) {
jbe@0 403 {
jbe@0 404 struct moonbr_pool *pool;
jbe@0 405 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0 406 {
jbe@0 407 struct moonbr_worker *worker;
jbe@0 408 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
jbe@0 409 moonbr_log(LOG_INFO, "Sending SIGKILL to child with PID %i", (int)worker->pid);
jbe@0 410 if (kill(worker->pid, SIGKILL)) {
jbe@0 411 moonbr_log(LOG_ERR, "Error while killing child process: %s", strerror(errno));
jbe@0 412 }
jbe@0 413 }
jbe@0 414 }
jbe@0 415 {
jbe@0 416 int i;
jbe@0 417 for (i=0; i<pool->listener_count; i++) {
jbe@0 418 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 419 if (listener->proto == MOONBR_PROTO_LOCAL) {
jbe@125 420 moonbr_log(LOG_INFO, "Unlinking local socket \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
jbe@125 421 if (unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
jbe@0 422 moonbr_log(LOG_ERR, "Error while unlinking local socket: %s", strerror(errno));
jbe@0 423 }
jbe@0 424 }
jbe@0 425 }
jbe@0 426 }
jbe@0 427 }
jbe@0 428 }
jbe@0 429 moonbr_log(exitcode ? LOG_ERR : LOG_NOTICE, "Terminating with exit code %i", exitcode);
jbe@0 430 if (moonbr_pidfh && pidfile_remove(moonbr_pidfh)) {
jbe@0 431 moonbr_log(LOG_ERR, "Error while removing PID file: %s", strerror(errno));
jbe@0 432 }
jbe@0 433 exit(exitcode);
jbe@0 434 }
jbe@0 435
jbe@0 436 /* Terminate with either MOONBR_EXITCODE_STARTUPERROR or MOONBR_EXITCODE_RUNTIMEERROR */
jbe@0 437 #define moonbr_terminate_error() \
jbe@0 438 moonbr_terminate( \
jbe@0 439 moonbr_pstate == MOONBR_PSTATE_STARTUP ? \
jbe@0 440 MOONBR_EXITCODE_STARTUPERROR : \
jbe@0 441 MOONBR_EXITCODE_RUNTIMEERROR \
jbe@0 442 )
jbe@0 443
jbe@0 444
jbe@0 445 /*** Helper functions ***/
jbe@0 446
jbe@0 447 /* Fills a 'struct timeval' structure with the current time (using CLOCK_MONOTONIC) */
jbe@0 448 static void moonbr_now(struct timeval *now) {
jbe@0 449 struct timespec ts = {0, };
jbe@0 450 if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
jbe@0 451 moonbr_log(LOG_CRIT, "Error in clock_gettime() call: %s", strerror(errno));
jbe@0 452 moonbr_terminate_error();
jbe@0 453 }
jbe@0 454 *now = (struct timeval){ .tv_sec = ts.tv_sec, .tv_usec = ts.tv_nsec / 1000 };
jbe@0 455 }
jbe@0 456
jbe@0 457 /* Formats a 'struct timeval' value (not thread-safe) */
jbe@0 458 static char *moonbr_format_timeval(struct timeval *t) {
jbe@0 459 static char buf[32];
jbe@0 460 snprintf(buf, 32, "%ji.%06ji seconds", (intmax_t)t->tv_sec, (intmax_t)t->tv_usec);
jbe@0 461 return buf;
jbe@0 462 }
jbe@0 463
jbe@0 464
jbe@0 465 /*** Functions for pool creation and startup ***/
jbe@0 466
jbe@0 467 /* Creates a 'struct moonbr_pool' structure with a given number of listeners */
jbe@0 468 static struct moonbr_pool *moonbr_create_pool(int listener_count) {
jbe@0 469 struct moonbr_pool *pool;
jbe@0 470 pool = calloc(1,
jbe@0 471 sizeof(struct moonbr_pool) + /* size of 'struct moonbr_pool' with one listener */
jbe@0 472 (listener_count-1) * sizeof(struct moonbr_listener) /* size of extra listeners */
jbe@0 473 );
jbe@0 474 if (!pool) {
jbe@0 475 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0 476 moonbr_terminate_error();
jbe@0 477 }
jbe@0 478 pool->listener_count = listener_count;
jbe@0 479 {
jbe@0 480 /* initialization of listeners */
jbe@0 481 int i;
jbe@0 482 for (i=0; i<listener_count; i++) {
jbe@0 483 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 484 listener->pool = pool;
jbe@0 485 listener->listenfd = -1;
jbe@0 486 listener->pollidx = -1;
jbe@0 487 }
jbe@0 488 }
jbe@0 489 return pool;
jbe@0 490 }
jbe@0 491
jbe@0 492 /* Destroys a 'struct moonbr_pool' structure before it has been started */
jbe@0 493 static void moonbr_destroy_pool(struct moonbr_pool *pool) {
jbe@0 494 int i;
jbe@0 495 for (i=0; i<pool->listener_count; i++) {
jbe@0 496 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 497 if (
jbe@0 498 listener->proto == MOONBR_PROTO_INTERVAL &&
jbe@125 499 listener->type_specific.interval.name
jbe@0 500 ) {
jbe@125 501 free(listener->type_specific.interval.name);
jbe@0 502 }
jbe@0 503 }
jbe@0 504 free(pool);
jbe@0 505 }
jbe@0 506
jbe@0 507 /* Starts a all listeners in a pool */
jbe@0 508 static int moonbr_start_pool(struct moonbr_pool *pool) {
jbe@0 509 moonbr_log(LOG_INFO, "Creating pool", pool->poolnum);
jbe@0 510 {
jbe@0 511 int i;
jbe@0 512 for (i=0; i<pool->listener_count; i++) {
jbe@0 513 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 514 switch (listener->proto) {
jbe@0 515 case MOONBR_PROTO_INTERVAL:
jbe@274 516 if (listener->type_specific.interval.main) {
jbe@274 517 /* nothing to do here: starting main thread is performed in moonbr_run() function */
jbe@274 518 if (!listener->type_specific.interval.name) {
jbe@274 519 moonbr_log(LOG_INFO, "Adding unnamed main thread");
jbe@274 520 } else {
jbe@274 521 moonbr_log(LOG_INFO, "Adding main thread \"%s\"", listener->type_specific.interval.name);
jbe@274 522 }
jbe@0 523 } else {
jbe@274 524 /* nothing to do here: starting intervals is performed in moonbr_run() function */
jbe@274 525 if (!listener->type_specific.interval.name) {
jbe@274 526 moonbr_log(LOG_INFO, "Adding unnamed interval listener");
jbe@274 527 } else {
jbe@274 528 moonbr_log(LOG_INFO, "Adding interval listener \"%s\"", listener->type_specific.interval.name);
jbe@274 529 }
jbe@0 530 }
jbe@0 531 break;
jbe@0 532 case MOONBR_PROTO_LOCAL:
jbe@125 533 moonbr_log(LOG_INFO, "Adding local socket listener for path \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
jbe@125 534 listener->listenfd = socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
jbe@125 535 if (listener->listenfd == -1) goto moonbr_start_pool_error;
jbe@125 536 if (!unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
jbe@125 537 moonbr_log(LOG_WARNING, "Unlinked named socket \"%s\" prior to listening", listener->type_specific.socket.addr.addr_un.sun_path);
jbe@125 538 } else {
jbe@125 539 if (errno != ENOENT) {
jbe@125 540 moonbr_log(LOG_ERR, "Could not unlink named socket \"%s\" prior to listening: %s", listener->type_specific.socket.addr.addr_un.sun_path, strerror(errno));
jbe@125 541 }
jbe@125 542 }
jbe@125 543 if (
jbe@125 544 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
jbe@125 545 ) goto moonbr_start_pool_error;
jbe@125 546 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
jbe@125 547 break;
jbe@125 548 case MOONBR_PROTO_TCP:
jbe@125 549 moonbr_log(LOG_INFO, "Adding TCP listener on interface \"%s\", port %i", listener->proto_specific.tcp.ip, listener->proto_specific.tcp.port);
jbe@134 550 listener->listenfd = socket(listener->type_specific.socket.addr.addr_abstract.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); /* NOTE: not correctly using PF_* but AF_* constants here */
jbe@125 551 if (listener->listenfd == -1) goto moonbr_start_pool_error;
jbe@0 552 {
jbe@125 553 /* avoid "Address already in use" error when restarting service */
jbe@125 554 static const int reuseval = 1;
jbe@125 555 if (setsockopt(
jbe@125 556 listener->listenfd, SOL_SOCKET, SO_REUSEADDR, &reuseval, sizeof(reuseval)
jbe@125 557 )) goto moonbr_start_pool_error;
jbe@0 558 }
jbe@0 559 {
jbe@125 560 /* default to send TCP RST when process terminates unexpectedly */
jbe@125 561 static const struct linger lingerval = {
jbe@125 562 .l_onoff = 1,
jbe@125 563 .l_linger = 0
jbe@0 564 };
jbe@125 565 if (setsockopt(
jbe@125 566 listener->listenfd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval)
jbe@125 567 )) goto moonbr_start_pool_error;
jbe@0 568 }
jbe@125 569 if (
jbe@125 570 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
jbe@125 571 ) goto moonbr_start_pool_error;
jbe@125 572 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
jbe@0 573 break;
jbe@0 574 default:
jbe@0 575 moonbr_log(LOG_CRIT, "Internal error (should not happen): Unexpected value in listener.proto field");
jbe@0 576 moonbr_terminate_error();
jbe@0 577 }
jbe@0 578 }
jbe@0 579 goto moonbr_start_pool_ok;
jbe@0 580 moonbr_start_pool_error:
jbe@0 581 {
jbe@0 582 int j = i;
jbe@0 583 int errno2 = errno;
jbe@0 584 for (; i>=0; i--) {
jbe@0 585 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 586 if (listener->listenfd != -1) close(listener->listenfd);
jbe@0 587 }
jbe@0 588 errno = errno2;
jbe@0 589 return j;
jbe@0 590 }
jbe@0 591 }
jbe@0 592 moonbr_start_pool_ok:
jbe@0 593 pool->poolnum = ++moonbr_pool_count;
jbe@0 594 moonbr_log(LOG_INFO, "Pool #%i created", pool->poolnum);
jbe@0 595 if (moonbr_last_pool) moonbr_last_pool->next_pool = pool;
jbe@0 596 else moonbr_first_pool = pool;
jbe@0 597 moonbr_last_pool = pool;
jbe@0 598 return -1;
jbe@0 599 }
jbe@0 600
jbe@0 601
jbe@0 602 /*** Function to send data and a file descriptor to child process */
jbe@0 603
jbe@0 604 /* Sends control message of one bye plus optional file descriptor plus optional pointer to child process */
jbe@0 605 static void moonbr_send_control_message(struct moonbr_worker *worker, char status, int fd, void *ptr) {
jbe@0 606 {
jbe@0 607 struct iovec iovector = { .iov_base = &status, .iov_len = 1 }; /* carrying status byte */
jbe@0 608 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to transfer file descriptor */
jbe@0 609 struct msghdr message = { .msg_iov = &iovector, .msg_iovlen = 1 }; /* data structure passed to sendmsg() call */
jbe@0 610 if (moonbr_debug) {
jbe@0 611 if (fd == -1) {
jbe@0 612 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
jbe@0 613 } else {
jbe@0 614 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" with file descriptor #%i to child process in pool #%i (PID %i)", (int)status, fd, worker->pool->poolnum, (int)worker->pid);
jbe@0 615 }
jbe@0 616 }
jbe@0 617 if (fd != -1) {
jbe@0 618 /* attach control message with file descriptor */
jbe@0 619 message.msg_control = control_message_buffer;
jbe@0 620 message.msg_controllen = CMSG_SPACE(sizeof(int));
jbe@0 621 {
jbe@0 622 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
jbe@0 623 control_message->cmsg_level = SOL_SOCKET;
jbe@0 624 control_message->cmsg_type = SCM_RIGHTS;
jbe@0 625 control_message->cmsg_len = CMSG_LEN(sizeof(int));
jbe@18 626 memcpy(CMSG_DATA(control_message), &fd, sizeof(int));
jbe@0 627 }
jbe@0 628 }
jbe@0 629 while (sendmsg(worker->controlfd, &message, MSG_NOSIGNAL) < 0) {
jbe@0 630 if (errno == EPIPE) {
jbe@0 631 moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 632 return; /* do not close socket; socket is closed when reading from it */
jbe@0 633 }
jbe@0 634 if (errno != EINTR) {
jbe@0 635 moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 636 moonbr_terminate_error();
jbe@0 637 }
jbe@0 638 }
jbe@0 639 }
jbe@0 640 if (ptr) {
jbe@0 641 char buf[sizeof(void *)];
jbe@0 642 char *pos = buf;
jbe@0 643 int len = sizeof(void *);
jbe@0 644 ssize_t written;
jbe@0 645 if (moonbr_debug) {
jbe@0 646 moonbr_log(LOG_DEBUG, "Sending memory pointer to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
jbe@0 647 }
jbe@18 648 memcpy(buf, &ptr, sizeof(void *));
jbe@0 649 while (len) {
jbe@0 650 written = send(worker->controlfd, pos, len, MSG_NOSIGNAL);
jbe@0 651 if (written > 0) {
jbe@0 652 pos += written;
jbe@0 653 len -= written;
jbe@0 654 } else if (errno == EPIPE) {
jbe@0 655 moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 656 return; /* do not close socket; socket is closed when reading from it */
jbe@0 657 } else if (errno != EINTR) {
jbe@0 658 moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 659 moonbr_terminate_error();
jbe@0 660 }
jbe@0 661 }
jbe@0 662 }
jbe@0 663 }
jbe@0 664
jbe@0 665
jbe@0 666 /*** Functions running in child process ***/
jbe@0 667
jbe@0 668 /* Logs an error in child process */
jbe@0 669 static void moonbr_child_log(const char *message) {
jbe@0 670 fprintf(stderr, "%s\n", message);
jbe@0 671 }
jbe@0 672
jbe@0 673 /* Logs a fatal error in child process and terminates process with error status */
jbe@0 674 static void moonbr_child_log_fatal(const char *message) {
jbe@0 675 moonbr_child_log(message);
jbe@0 676 exit(1);
jbe@0 677 }
jbe@0 678
jbe@0 679 /* Logs an error in child process while appending error string for global errno variable */
jbe@0 680 static void moonbr_child_log_errno(const char *message) {
jbe@213 681 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
jbe@20 682 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
jbe@0 683 fprintf(stderr, "%s: %s\n", message, errmsg);
jbe@0 684 }
jbe@0 685
jbe@0 686 /* Logs a fatal error in child process while appending error string for errno and terminating process */
jbe@0 687 static void moonbr_child_log_errno_fatal(const char *message) {
jbe@0 688 moonbr_child_log_errno(message);
jbe@0 689 exit(1);
jbe@0 690 }
jbe@0 691
jbe@0 692 /* Receives a control message consisting of one character plus an optional file descriptor from parent process */
jbe@0 693 static void moonbr_child_receive_control_message(int socketfd, char *status, int *fd) {
jbe@0 694 struct iovec iovector = { .iov_base = status, .iov_len = 1 }; /* reference to status byte variable */
jbe@0 695 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to receive file descriptor */
jbe@0 696 struct msghdr message = { /* data structure passed to recvmsg() call */
jbe@0 697 .msg_iov = &iovector,
jbe@0 698 .msg_iovlen = 1,
jbe@0 699 .msg_control = control_message_buffer,
jbe@0 700 .msg_controllen = CMSG_SPACE(sizeof(int))
jbe@0 701 };
jbe@0 702 {
jbe@0 703 int received;
jbe@0 704 while ((received = recvmsg(socketfd, &message, MSG_CMSG_CLOEXEC)) < 0) {
jbe@0 705 if (errno != EINTR) {
jbe@0 706 moonbr_child_log_errno_fatal("Error while trying to receive connection socket from parent process");
jbe@0 707 }
jbe@0 708 }
jbe@0 709 if (!received) {
jbe@0 710 moonbr_child_log_fatal("Unexpected EOF while trying to receive connection socket from parent process");
jbe@0 711 }
jbe@0 712 }
jbe@0 713 {
jbe@0 714 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
jbe@0 715 if (control_message) {
jbe@0 716 if (control_message->cmsg_level != SOL_SOCKET) {
jbe@0 717 moonbr_child_log_fatal("Received control message with cmsg_level not equal to SOL_SOCKET");
jbe@0 718 }
jbe@0 719 if (control_message->cmsg_type != SCM_RIGHTS) {
jbe@0 720 moonbr_child_log_fatal("Received control message with cmsg_type not equal to SCM_RIGHTS");
jbe@0 721 }
jbe@18 722 memcpy(fd, CMSG_DATA(control_message), sizeof(int));
jbe@0 723 } else {
jbe@0 724 *fd = -1;
jbe@0 725 }
jbe@0 726 }
jbe@0 727 }
jbe@0 728
jbe@0 729 /* Receives a pointer from parent process */
jbe@0 730 static void *moonbr_child_receive_pointer(int socketfd) {
jbe@0 731 char buf[sizeof(void *)];
jbe@0 732 char *pos = buf;
jbe@0 733 int len = sizeof(void *);
jbe@0 734 ssize_t bytes_read;
jbe@0 735 while (len) {
jbe@0 736 bytes_read = recv(socketfd, pos, len, 0);
jbe@0 737 if (bytes_read > 0) {
jbe@0 738 pos += bytes_read;
jbe@0 739 len -= bytes_read;
jbe@0 740 } else if (!bytes_read) {
jbe@0 741 moonbr_child_log_fatal("Unexpected EOF while trying to receive memory pointer from parent process");
jbe@0 742 } else if (errno != EINTR) {
jbe@0 743 moonbr_child_log_errno_fatal("Error while trying to receive memory pointer from parent process");
jbe@0 744 }
jbe@0 745 }
jbe@18 746 {
jbe@18 747 void *ptr; /* avoid breaking strict-aliasing rules */
jbe@18 748 memcpy(&ptr, buf, sizeof(void *));
jbe@18 749 return ptr;
jbe@18 750 }
jbe@0 751 }
jbe@0 752
jbe@0 753 /* Main function of child process to be called after fork() and file descriptor rearrangement */
jbe@0 754 void moonbr_child_run(struct moonbr_pool *pool, lua_State *L) {
jbe@0 755 char controlmsg;
jbe@88 756 int fd;
jbe@0 757 struct itimerval notimer = { { 0, }, { 0, } };
jbe@0 758 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
jbe@0 759 if (lua_isnil(L, -1)) lua_pop(L, 1);
jbe@0 760 else if (lua_pcall(L, 0, 0, 1)) {
jbe@0 761 fprintf(stderr, "Error in \"prepare\" function: %s\n", lua_tostring(L, -1));
jbe@0 762 exit(1);
jbe@0 763 }
jbe@293 764 moonbr_io_catch_sigterm(L); // NOTE: should not fail
jbe@0 765 while (1) {
jbe@0 766 struct moonbr_listener *listener;
jbe@0 767 if (setitimer(ITIMER_REAL, &notimer, NULL)) {
jbe@0 768 moonbr_child_log_errno_fatal("Could not reset ITIMER_REAL via setitimer()");
jbe@0 769 }
jbe@0 770 controlmsg = MOONBR_STATUS_IDLE;
jbe@0 771 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
jbe@0 772 moonbr_child_log_errno_fatal("Error while sending ready message to parent process");
jbe@0 773 }
jbe@88 774 moonbr_child_receive_control_message(MOONBR_FD_CONTROL, &controlmsg, &fd);
jbe@0 775 if (!(
jbe@124 776 (controlmsg == MOONBR_COMMAND_TERMINATE && fd == -1) ||
jbe@124 777 (controlmsg == MOONBR_COMMAND_CONNECT)
jbe@0 778 )) {
jbe@0 779 moonbr_child_log_fatal("Received illegal control message from parent process");
jbe@0 780 }
jbe@0 781 if (controlmsg == MOONBR_COMMAND_TERMINATE) break;
jbe@293 782 moonbr_io_sigterm_flag = 0; /* ignore any prior SIGTERM (can't be handled in blocking recv anyway) */
jbe@0 783 listener = moonbr_child_receive_pointer(MOONBR_FD_CONTROL);
jbe@127 784 if (
jbe@127 785 listener->proto != MOONBR_PROTO_LOCAL &&
jbe@127 786 listener->proto != MOONBR_PROTO_TCP &&
jbe@127 787 fd >= 0
jbe@127 788 ) {
jbe@124 789 moonbr_child_log_fatal("Received unexpected file descriptor from parent process");
jbe@127 790 } else if (
jbe@274 791 listener->proto != MOONBR_PROTO_INTERVAL && fd < 0
jbe@127 792 ) {
jbe@124 793 moonbr_child_log_fatal("Missing file descriptor from parent process");
jbe@124 794 }
jbe@119 795 if (fd >= 0) moonbr_io_pushhandle(L, fd);
jbe@0 796 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
jbe@119 797 if (fd < 0) {
jbe@0 798 lua_newtable(L);
jbe@274 799 if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@131 800 lua_pushstring(L,
jbe@131 801 listener->type_specific.interval.name ?
jbe@131 802 listener->type_specific.interval.name : ""
jbe@131 803 );
jbe@274 804 if (listener->type_specific.interval.main) {
jbe@274 805 lua_setfield(L, -2, "main");
jbe@274 806 } else {
jbe@274 807 lua_setfield(L, -2, "interval");
jbe@274 808 }
jbe@131 809 }
jbe@0 810 } else {
jbe@88 811 lua_pushvalue(L, -2);
jbe@0 812 }
jbe@0 813 if (lua_pcall(L, 1, 1, 1)) {
jbe@0 814 fprintf(stderr, "Error in \"connect\" function: %s\n", lua_tostring(L, -1));
jbe@0 815 exit(1);
jbe@0 816 }
jbe@119 817 if (fd >= 0) moonbr_io_closehandle(L, -2, 0); /* attemt clean close */
jbe@293 818 if (
jbe@293 819 moonbr_io_sigterm_flag ||
jbe@293 820 lua_type(L, -1) != LUA_TBOOLEAN || !lua_toboolean(L, -1)
jbe@293 821 ) break;
jbe@0 822 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
jbe@0 823 lua_settop(L, 2);
jbe@0 824 #else
jbe@0 825 lua_settop(L, 1);
jbe@0 826 #endif
jbe@0 827 }
jbe@0 828 controlmsg = MOONBR_STATUS_GOODBYE;
jbe@0 829 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
jbe@0 830 moonbr_child_log_errno_fatal("Error while sending goodbye message to parent process");
jbe@0 831 }
jbe@0 832 if (close(MOONBR_FD_CONTROL) && errno != EINTR) {
jbe@0 833 moonbr_child_log_errno("Error while closing control socket");
jbe@0 834 }
jbe@0 835 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
jbe@0 836 if (lua_isnil(L, -1)) lua_pop(L, 1);
jbe@0 837 else if (lua_pcall(L, 0, 0, 1)) {
jbe@0 838 fprintf(stderr, "Error in \"finish\" function: %s\n", lua_tostring(L, -1));
jbe@0 839 exit(1);
jbe@0 840 }
jbe@0 841 lua_close(L);
jbe@0 842 exit(0);
jbe@0 843 }
jbe@0 844
jbe@0 845
jbe@0 846 /*** Functions to spawn child process ***/
jbe@0 847
jbe@0 848 /* Helper function to send an error message to a file descriptor (not needing a file stream) */
jbe@0 849 static void moonbr_child_emergency_print(int fd, char *message) {
jbe@0 850 size_t len = strlen(message);
jbe@0 851 ssize_t written;
jbe@0 852 while (len) {
jbe@0 853 written = write(fd, message, len);
jbe@0 854 if (written > 0) {
jbe@0 855 message += written;
jbe@0 856 len -= written;
jbe@0 857 } else {
jbe@0 858 if (written != -1 || errno != EINTR) break;
jbe@0 859 }
jbe@0 860 }
jbe@0 861 }
jbe@0 862
jbe@0 863 /* Helper function to send an error message plus a text for errno to a file descriptor and terminate the process */
jbe@0 864 static void moonbr_child_emergency_error(int fd, char *message) {
jbe@0 865 int errno2 = errno;
jbe@0 866 moonbr_child_emergency_print(fd, message);
jbe@0 867 moonbr_child_emergency_print(fd, ": ");
jbe@0 868 moonbr_child_emergency_print(fd, strerror(errno2));
jbe@0 869 moonbr_child_emergency_print(fd, "\n");
jbe@0 870 exit(1);
jbe@0 871 }
jbe@0 872
jbe@0 873 /* Creates a child process and (in case of success) registers it in the 'struct moonbr_pool' structure */
jbe@0 874 static int moonbr_create_worker(struct moonbr_pool *pool, lua_State *L) {
jbe@0 875 struct moonbr_worker *worker;
jbe@0 876 worker = calloc(1, sizeof(struct moonbr_worker));
jbe@0 877 if (!worker) {
jbe@0 878 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0 879 return -1;
jbe@0 880 }
jbe@0 881 worker->pool = pool;
jbe@0 882 {
jbe@0 883 int controlfds[2];
jbe@0 884 int errorfds[2];
jbe@0 885 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, controlfds)) {
jbe@0 886 moonbr_log(LOG_ERR, "Could not create control socket pair for communcation with child process: %s", strerror(errno));
jbe@0 887 free(worker);
jbe@0 888 return -1;
jbe@0 889 }
jbe@0 890 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, errorfds)) {
jbe@0 891 moonbr_log(LOG_ERR, "Could not create socket pair to redirect stderr of child process: %s", strerror(errno));
jbe@0 892 close(controlfds[0]);
jbe@0 893 close(controlfds[1]);
jbe@0 894 free(worker);
jbe@0 895 return -1;
jbe@0 896 }
jbe@0 897 if (moonbr_logfile && fflush(moonbr_logfile)) {
jbe@0 898 moonbr_log(LOG_CRIT, "Could not flush log file prior to forking: %s", strerror(errno));
jbe@0 899 moonbr_terminate_error();
jbe@0 900 }
jbe@0 901 worker->pid = fork();
jbe@0 902 if (worker->pid == -1) {
jbe@0 903 moonbr_log(LOG_ERR, "Could not fork: %s", strerror(errno));
jbe@0 904 close(controlfds[0]);
jbe@0 905 close(controlfds[1]);
jbe@0 906 close(errorfds[0]);
jbe@0 907 close(errorfds[1]);
jbe@0 908 free(worker);
jbe@0 909 return -1;
jbe@0 910 } else if (!worker->pid) {
jbe@0 911 moonbr_pstate = MOONBR_PSTATE_FORKED;
jbe@0 912 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
jbe@0 913 lua_pushliteral(L, "Failed to pass error message due to bug in Lua panic handler (hint: not enough memory?)");
jbe@0 914 #endif
jbe@0 915 moonbr_memory_limit = pool->memory_limit;
jbe@0 916 if (moonbr_pidfh && pidfile_close(moonbr_pidfh)) {
jbe@0 917 moonbr_child_emergency_error(errorfds[1], "Could not close PID file in forked child process");
jbe@0 918 }
jbe@0 919 if (moonbr_logfile && moonbr_logfile != stderr && fclose(moonbr_logfile)) {
jbe@0 920 moonbr_child_emergency_error(errorfds[1], "Could not close log file in forked child process");
jbe@0 921 }
jbe@0 922 if (dup2(errorfds[1], MOONBR_FD_STDERR) == -1) {
jbe@0 923 moonbr_child_emergency_error(errorfds[1], "Could not duplicate socket to stderr file descriptor");
jbe@0 924 }
jbe@0 925 if (dup2(controlfds[1], MOONBR_FD_CONTROL) == -1) {
jbe@0 926 moonbr_child_emergency_error(errorfds[1], "Could not duplicate control socket");
jbe@0 927 }
jbe@0 928 closefrom(MOONBR_FD_END);
jbe@0 929 moonbr_child_run(pool, L);
jbe@0 930 }
jbe@0 931 if (moonbr_stat) {
jbe@0 932 moonbr_log(LOG_INFO, "Created new worker in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
jbe@0 933 }
jbe@0 934 worker->controlfd = controlfds[0];
jbe@0 935 worker->errorfd = errorfds[0];
jbe@0 936 if (close(controlfds[1]) && errno != EINTR) {
jbe@0 937 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
jbe@0 938 moonbr_terminate_error();
jbe@0 939 }
jbe@0 940 if (close(errorfds[1]) && errno != EINTR) {
jbe@0 941 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
jbe@0 942 moonbr_terminate_error();
jbe@0 943 }
jbe@0 944 }
jbe@0 945 worker->prev_worker = pool->last_worker;
jbe@0 946 if (worker->prev_worker) worker->prev_worker->next_worker = worker;
jbe@0 947 else pool->first_worker = worker;
jbe@0 948 pool->last_worker = worker;
jbe@0 949 pool->unassigned_worker_count++;
jbe@0 950 pool->total_worker_count++;
jbe@0 951 pool->worker_count_stat = 1;
jbe@0 952 moonbr_poll_refresh_needed = 1;
jbe@0 953 return 0; /* return zero only in case of success */
jbe@0 954 }
jbe@0 955
jbe@0 956
jbe@0 957 /*** Functions for queues of 'struct moonbr_listener' ***/
jbe@0 958
jbe@0 959 /* Appends a 'struct moonbr_listener' to the queue of idle listeners and registers it for poll() */
jbe@0 960 static void moonbr_add_idle_listener(struct moonbr_listener *listener) {
jbe@0 961 listener->prev_listener = listener->pool->last_idle_listener;
jbe@0 962 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
jbe@0 963 else listener->pool->first_idle_listener = listener;
jbe@0 964 listener->pool->last_idle_listener = listener;
jbe@0 965 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events |= POLLIN;
jbe@0 966 }
jbe@0 967
jbe@0 968 /* Removes a 'struct moonbr_listener' from the queue of idle listeners and unregisters it from poll() */
jbe@0 969 static void moonbr_remove_idle_listener(struct moonbr_listener *listener) {
jbe@0 970 if (listener->prev_listener) listener->prev_listener->next_listener = listener->next_listener;
jbe@0 971 else listener->pool->first_idle_listener = listener->next_listener;
jbe@0 972 if (listener->next_listener) listener->next_listener->prev_listener = listener->prev_listener;
jbe@0 973 else listener->pool->last_idle_listener = listener->prev_listener;
jbe@0 974 listener->prev_listener = NULL;
jbe@0 975 listener->next_listener = NULL;
jbe@0 976 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events &= ~POLLIN;
jbe@0 977 }
jbe@0 978
jbe@0 979 /* Adds a listener to the queue of connected listeners (i.e. waiting to have their incoming connection accepted) */
jbe@0 980 static void moonbr_add_connected_listener(struct moonbr_listener *listener) {
jbe@0 981 listener->prev_listener = listener->pool->last_connected_listener;
jbe@0 982 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
jbe@0 983 else listener->pool->first_connected_listener = listener;
jbe@0 984 listener->pool->last_connected_listener = listener;
jbe@0 985 }
jbe@0 986
jbe@0 987 /* Removes and returns the first connected listener in the queue */
jbe@0 988 static struct moonbr_listener *moonbr_pop_connected_listener(struct moonbr_pool *pool) {
jbe@0 989 struct moonbr_listener *listener = pool->first_connected_listener;
jbe@0 990 listener->pool->first_connected_listener = listener->next_listener;
jbe@0 991 if (listener->pool->first_connected_listener) listener->pool->first_connected_listener->prev_listener = NULL;
jbe@0 992 else listener->pool->last_connected_listener = NULL;
jbe@0 993 listener->next_listener = NULL;
jbe@0 994 return listener;
jbe@0 995 }
jbe@0 996
jbe@0 997
jbe@0 998 /*** Functions to handle polling ***/
jbe@0 999
jbe@0 1000 /* Returns an index to a new initialized entry in moonbr_poll_fds[] */
jbe@0 1001 int moonbr_poll_fds_nextindex() {
jbe@0 1002 if (moonbr_poll_fds_count >= moonbr_poll_fds_bufsize) {
jbe@0 1003 if (moonbr_poll_fds_bufsize) moonbr_poll_fds_bufsize *= 2;
jbe@0 1004 else moonbr_poll_fds_bufsize = 1;
jbe@0 1005 moonbr_poll_fds = realloc(
jbe@0 1006 moonbr_poll_fds, moonbr_poll_fds_bufsize * sizeof(struct pollfd)
jbe@0 1007 );
jbe@0 1008 if (!moonbr_poll_fds) {
jbe@0 1009 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0 1010 moonbr_terminate_error();
jbe@0 1011 }
jbe@0 1012 }
jbe@0 1013 moonbr_poll_fds[moonbr_poll_fds_count] = (struct pollfd){0, };
jbe@0 1014 return moonbr_poll_fds_count++;
jbe@0 1015 }
jbe@0 1016
jbe@0 1017 /* Returns an index to a new initialized entry in moonbr_poll_workers[] */
jbe@0 1018 int moonbr_poll_workers_nextindex() {
jbe@0 1019 if (moonbr_poll_worker_count >= moonbr_poll_workers_bufsize) {
jbe@0 1020 if (moonbr_poll_workers_bufsize) moonbr_poll_workers_bufsize *= 2;
jbe@0 1021 else moonbr_poll_workers_bufsize = 1;
jbe@0 1022 moonbr_poll_workers = realloc(
jbe@0 1023 moonbr_poll_workers, moonbr_poll_workers_bufsize * sizeof(struct moonbr_poll_worker)
jbe@0 1024 );
jbe@0 1025 if (!moonbr_poll_workers) {
jbe@0 1026 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0 1027 moonbr_terminate_error();
jbe@0 1028 }
jbe@0 1029 }
jbe@0 1030 moonbr_poll_workers[moonbr_poll_worker_count] = (struct moonbr_poll_worker){0, };
jbe@0 1031 return moonbr_poll_worker_count++;
jbe@0 1032 }
jbe@0 1033
jbe@0 1034 /* Queues all listeners as idle, and initializes static part of moonbr_poll_fds[], which is passed to poll() */
jbe@0 1035 static void moonbr_poll_init() {
jbe@0 1036 if (socketpair(
jbe@0 1037 PF_LOCAL,
jbe@0 1038 SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
jbe@0 1039 0,
jbe@0 1040 moonbr_poll_signalfds
jbe@0 1041 )) {
jbe@0 1042 moonbr_log(LOG_CRIT, "Could not create socket pair for signal delivery during polling: %s", strerror(errno));
jbe@0 1043 moonbr_terminate_error();
jbe@0 1044 }
jbe@0 1045 {
jbe@0 1046 int j = moonbr_poll_fds_nextindex();
jbe@0 1047 struct pollfd *pollfd = &moonbr_poll_fds[j];
jbe@0 1048 pollfd->fd = moonbr_poll_signalfd_read;
jbe@0 1049 pollfd->events = POLLIN;
jbe@0 1050 }
jbe@0 1051 {
jbe@0 1052 struct moonbr_pool *pool;
jbe@0 1053 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0 1054 int i;
jbe@0 1055 for (i=0; i<pool->listener_count; i++) {
jbe@0 1056 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 1057 if (listener->listenfd != -1) {
jbe@0 1058 int j = moonbr_poll_fds_nextindex();
jbe@0 1059 listener->pollidx = j;
jbe@0 1060 moonbr_poll_fds[j].fd = listener->listenfd;
jbe@0 1061 }
jbe@0 1062 moonbr_add_idle_listener(listener);
jbe@0 1063 }
jbe@0 1064 }
jbe@0 1065 }
jbe@0 1066 moonbr_poll_fds_static_count = moonbr_poll_fds_count; /* remember size of static part of array */
jbe@0 1067 }
jbe@0 1068
jbe@0 1069 /* Disables polling of all listeners (required for clean shutdown) */
jbe@0 1070 static void moonbr_poll_shutdown() {
jbe@0 1071 int i;
jbe@0 1072 for (i=1; i<moonbr_poll_fds_static_count; i++) {
jbe@0 1073 moonbr_poll_fds[i].fd = -1;
jbe@0 1074 }
jbe@0 1075 }
jbe@0 1076
jbe@0 1077 /* (Re)builds dynamic part of moonbr_poll_fds[] array, and (re)builds moonbr_poll_workers[] array */
jbe@0 1078 static void moonbr_poll_refresh() {
jbe@0 1079 moonbr_poll_refresh_needed = 0;
jbe@0 1080 moonbr_poll_fds_count = moonbr_poll_fds_static_count;
jbe@0 1081 moonbr_poll_worker_count = 0;
jbe@0 1082 {
jbe@0 1083 struct moonbr_pool *pool;
jbe@0 1084 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0 1085 struct moonbr_worker *worker;
jbe@0 1086 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
jbe@0 1087 if (worker->controlfd != -1) {
jbe@0 1088 int j = moonbr_poll_fds_nextindex();
jbe@0 1089 int k = moonbr_poll_workers_nextindex();
jbe@0 1090 struct pollfd *pollfd = &moonbr_poll_fds[j];
jbe@0 1091 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
jbe@0 1092 pollfd->fd = worker->controlfd;
jbe@0 1093 pollfd->events = POLLIN;
jbe@0 1094 poll_worker->channel = MOONBR_POLL_WORKER_CONTROLCHANNEL;
jbe@0 1095 poll_worker->worker = worker;
jbe@0 1096 }
jbe@0 1097 if (worker->errorfd != -1) {
jbe@0 1098 int j = moonbr_poll_fds_nextindex();
jbe@0 1099 int k = moonbr_poll_workers_nextindex();
jbe@0 1100 struct pollfd *pollfd = &moonbr_poll_fds[j];
jbe@0 1101 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
jbe@0 1102 pollfd->fd = worker->errorfd;
jbe@0 1103 pollfd->events = POLLIN;
jbe@0 1104 poll_worker->channel = MOONBR_POLL_WORKER_ERRORCHANNEL;
jbe@0 1105 poll_worker->worker = worker;
jbe@0 1106 }
jbe@0 1107 }
jbe@0 1108 }
jbe@0 1109 }
jbe@0 1110 }
jbe@0 1111
jbe@0 1112 /* resets socket and 'revents' field of moonbr_poll_fds[] for signal delivery just before poll() is called */
jbe@0 1113 static void moonbr_poll_reset_signal() {
jbe@0 1114 ssize_t readcount;
jbe@0 1115 char buf[1];
jbe@0 1116 moonbr_poll_fds[0].revents = 0;
jbe@0 1117 while ((readcount = read(moonbr_poll_signalfd_read, buf, 1)) < 0) {
jbe@0 1118 if (errno == EAGAIN) break;
jbe@0 1119 if (errno != EINTR) {
jbe@0 1120 moonbr_log(LOG_CRIT, "Error while reading from signal delivery socket: %s", strerror(errno));
jbe@0 1121 moonbr_terminate_error();
jbe@0 1122 }
jbe@0 1123 }
jbe@0 1124 if (!readcount) {
jbe@0 1125 moonbr_log(LOG_CRIT, "Unexpected EOF when reading from signal delivery socket: %s", strerror(errno));
jbe@0 1126 moonbr_terminate_error();
jbe@0 1127 }
jbe@0 1128 }
jbe@0 1129
jbe@0 1130
jbe@0 1131 /*** Shutdown initiation ***/
jbe@0 1132
jbe@0 1133 /* Sets global variable 'moonbr_shutdown_in_progress', closes listeners, and demands worker termination */
jbe@0 1134 static void moonbr_initiate_shutdown() {
jbe@0 1135 struct moonbr_pool *pool;
jbe@294 1136 int i;
jbe@294 1137 struct moonbr_worker *worker;
jbe@0 1138 if (moonbr_shutdown_in_progress) {
jbe@0 1139 moonbr_log(LOG_NOTICE, "Shutdown already in progress");
jbe@0 1140 return;
jbe@0 1141 }
jbe@0 1142 moonbr_shutdown_in_progress = 1;
jbe@0 1143 moonbr_log(LOG_NOTICE, "Initiate shutdown");
jbe@0 1144 for (pool = moonbr_first_pool; pool; pool = pool->next_pool) {
jbe@0 1145 for (i=0; i<pool->listener_count; i++) {
jbe@0 1146 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 1147 if (listener->listenfd != -1) {
jbe@0 1148 if (close(listener->listenfd) && errno != EINTR) {
jbe@0 1149 moonbr_log(LOG_CRIT, "Could not close listening socket: %s", strerror(errno));
jbe@0 1150 moonbr_terminate_error();
jbe@0 1151 }
jbe@0 1152 }
jbe@0 1153 }
jbe@291 1154 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
jbe@291 1155 if (moonbr_debug) {
jbe@291 1156 moonbr_log(LOG_DEBUG, "Sending SIGTERM to child with PID %i", (int)worker->pid);
jbe@291 1157 }
jbe@291 1158 if (kill(worker->pid, SIGTERM)) {
jbe@291 1159 moonbr_log(LOG_ERR, "Error while terminating child process: %s", strerror(errno));
jbe@291 1160 }
jbe@195 1161 }
jbe@195 1162 }
jbe@294 1163 moonbr_poll_shutdown(); /* avoids loops due to error condition when polling closed listeners */
jbe@0 1164 }
jbe@0 1165
jbe@0 1166
jbe@128 1167 /*** Functions to handle previously created 'struct moonbr_worker' structures ***/
jbe@128 1168
jbe@128 1169 #define moonbr_try_destroy_worker_stat(str, field) \
jbe@128 1170 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: " str " %li", worker->pool->poolnum, (int)worker->pid, (long)childusage.field);
jbe@128 1171
jbe@128 1172 /* Destroys a worker structure if socket connections have been closed and child process has terminated */
jbe@128 1173 static int moonbr_try_destroy_worker(struct moonbr_worker *worker) {
jbe@128 1174 if (worker->controlfd != -1 || worker->errorfd != -1) return MOONBR_DESTROY_NONE;
jbe@128 1175 {
jbe@128 1176 int childstatus;
jbe@128 1177 struct rusage childusage;
jbe@128 1178 {
jbe@128 1179 pid_t waitedpid;
jbe@128 1180 while (
jbe@128 1181 (waitedpid = wait4(worker->pid, &childstatus, WNOHANG, &childusage)) == -1
jbe@128 1182 ) {
jbe@128 1183 if (errno != EINTR) {
jbe@128 1184 moonbr_log(LOG_CRIT, "Error in wait4() call: %s", strerror(errno));
jbe@128 1185 moonbr_terminate_error();
jbe@128 1186 }
jbe@128 1187 }
jbe@128 1188 if (!waitedpid) return 0; /* return 0 if worker couldn't be destroyed */
jbe@128 1189 if (waitedpid != worker->pid) {
jbe@128 1190 moonbr_log(LOG_CRIT, "Wrong PID returned by wait4() call");
jbe@128 1191 moonbr_terminate_error();
jbe@128 1192 }
jbe@128 1193 }
jbe@128 1194 if (WIFEXITED(childstatus)) {
jbe@128 1195 if (WEXITSTATUS(childstatus) || moonbr_stat) {
jbe@128 1196 moonbr_log(
jbe@128 1197 WEXITSTATUS(childstatus) ? LOG_WARNING : LOG_INFO,
jbe@128 1198 "Child process in pool #%i with PID %i returned with exit code %i", worker->pool->poolnum, (int)worker->pid, WEXITSTATUS(childstatus)
jbe@128 1199 );
jbe@128 1200 }
jbe@128 1201 } else if (WIFSIGNALED(childstatus)) {
jbe@128 1202 if (WCOREDUMP(childstatus)) {
jbe@128 1203 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i (core dump was created)", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
jbe@128 1204 } else if (WTERMSIG(childstatus) == SIGALRM) {
jbe@128 1205 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i exited prematurely due to timeout", worker->pool->poolnum, (int)worker->pid);
jbe@128 1206 } else {
jbe@128 1207 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
jbe@128 1208 }
jbe@128 1209 } else {
jbe@128 1210 moonbr_log(LOG_CRIT, "Illegal exit status from child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
jbe@128 1211 moonbr_terminate_error();
jbe@128 1212 }
jbe@128 1213 if (moonbr_stat) {
jbe@128 1214 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: user time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_utime));
jbe@128 1215 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: system time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_stime));
jbe@128 1216 moonbr_try_destroy_worker_stat("max resident set size", ru_maxrss);
jbe@128 1217 moonbr_try_destroy_worker_stat("integral shared memory size", ru_ixrss);
jbe@128 1218 moonbr_try_destroy_worker_stat("integral unshared data", ru_idrss);
jbe@128 1219 moonbr_try_destroy_worker_stat("integral unshared stack", ru_isrss);
jbe@128 1220 moonbr_try_destroy_worker_stat("page replaims", ru_minflt);
jbe@128 1221 moonbr_try_destroy_worker_stat("page faults", ru_majflt);
jbe@128 1222 moonbr_try_destroy_worker_stat("swaps", ru_nswap);
jbe@128 1223 moonbr_try_destroy_worker_stat("block input operations", ru_inblock);
jbe@128 1224 moonbr_try_destroy_worker_stat("block output operations", ru_oublock);
jbe@128 1225 moonbr_try_destroy_worker_stat("messages sent", ru_msgsnd);
jbe@128 1226 moonbr_try_destroy_worker_stat("messages received", ru_msgrcv);
jbe@128 1227 moonbr_try_destroy_worker_stat("signals received", ru_nsignals);
jbe@128 1228 moonbr_try_destroy_worker_stat("voluntary context switches", ru_nvcsw);
jbe@128 1229 moonbr_try_destroy_worker_stat("involuntary context switches", ru_nivcsw);
jbe@128 1230 }
jbe@128 1231 }
jbe@128 1232 {
jbe@128 1233 int retval = (
jbe@128 1234 (worker->idle || worker->assigned) ?
jbe@128 1235 MOONBR_DESTROY_IDLE_OR_ASSIGNED :
jbe@128 1236 MOONBR_DESTROY_PREPARE
jbe@128 1237 );
jbe@302 1238 if (worker->main && !moonbr_shutdown_in_progress) moonbr_initiate_shutdown();
jbe@128 1239 if (worker->prev_worker) worker->prev_worker->next_worker = worker->next_worker;
jbe@128 1240 else worker->pool->first_worker = worker->next_worker;
jbe@128 1241 if (worker->next_worker) worker->next_worker->prev_worker = worker->prev_worker;
jbe@128 1242 else worker->pool->last_worker = worker->prev_worker;
jbe@128 1243 if (worker->idle) {
jbe@128 1244 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker->next_idle_worker;
jbe@128 1245 else worker->pool->first_idle_worker = worker->next_idle_worker;
jbe@128 1246 if (worker->next_idle_worker) worker->next_idle_worker->prev_idle_worker = worker->prev_idle_worker;
jbe@128 1247 else worker->pool->last_idle_worker = worker->prev_idle_worker;
jbe@128 1248 worker->pool->idle_worker_count--;
jbe@128 1249 }
jbe@128 1250 if (!worker->assigned) worker->pool->unassigned_worker_count--;
jbe@128 1251 worker->pool->total_worker_count--;
jbe@128 1252 worker->pool->worker_count_stat = 1;
jbe@128 1253 if (worker->errorlinebuf) free(worker->errorlinebuf);
jbe@128 1254 free(worker);
jbe@128 1255 return retval;
jbe@128 1256 }
jbe@128 1257 }
jbe@128 1258
jbe@128 1259 /* Marks a worker as idle and stores it in a queue, optionally setting 'idle_expiration' value */
jbe@128 1260 static void moonbr_add_idle_worker(struct moonbr_worker *worker) {
jbe@128 1261 worker->prev_idle_worker = worker->pool->last_idle_worker;
jbe@128 1262 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker;
jbe@128 1263 else worker->pool->first_idle_worker = worker;
jbe@128 1264 worker->pool->last_idle_worker = worker;
jbe@128 1265 worker->idle = 1;
jbe@128 1266 worker->pool->idle_worker_count++;
jbe@128 1267 if (worker->assigned) {
jbe@128 1268 worker->assigned = 0;
jbe@128 1269 worker->pool->unassigned_worker_count++;
jbe@128 1270 }
jbe@128 1271 worker->pool->worker_count_stat = 1;
jbe@128 1272 if (timerisset(&worker->pool->idle_timeout)) {
jbe@128 1273 struct timeval now;
jbe@128 1274 moonbr_now(&now);
jbe@128 1275 timeradd(&now, &worker->pool->idle_timeout, &worker->idle_expiration);
jbe@128 1276 }
jbe@128 1277 }
jbe@128 1278
jbe@128 1279 /* Pops a worker from the queue of idle workers (idle queue must not be empty) */
jbe@128 1280 static struct moonbr_worker *moonbr_pop_idle_worker(struct moonbr_pool *pool) {
jbe@128 1281 struct moonbr_worker *worker;
jbe@128 1282 worker = pool->first_idle_worker;
jbe@128 1283 pool->first_idle_worker = worker->next_idle_worker;
jbe@128 1284 if (pool->first_idle_worker) pool->first_idle_worker->prev_idle_worker = NULL;
jbe@128 1285 else pool->last_idle_worker = NULL;
jbe@128 1286 worker->next_idle_worker = NULL;
jbe@128 1287 worker->idle = 0;
jbe@128 1288 worker->pool->idle_worker_count--;
jbe@128 1289 worker->assigned = 1;
jbe@128 1290 worker->pool->unassigned_worker_count--;
jbe@128 1291 worker->pool->worker_count_stat = 1;
jbe@128 1292 return worker;
jbe@128 1293 }
jbe@128 1294
jbe@128 1295
jbe@0 1296 /*** Functions to communicate with child processes ***/
jbe@0 1297
jbe@0 1298 /* Tells child process to terminate */
jbe@0 1299 static void moonbr_terminate_idle_worker(struct moonbr_worker *worker) {
jbe@0 1300 moonbr_send_control_message(worker, MOONBR_COMMAND_TERMINATE, -1, NULL);
jbe@0 1301 }
jbe@0 1302
jbe@0 1303 /* Handles status messages from child process */
jbe@0 1304 static void moonbr_read_controlchannel(struct moonbr_worker *worker) {
jbe@0 1305 char controlmsg;
jbe@0 1306 {
jbe@0 1307 ssize_t bytes_read;
jbe@0 1308 while ((bytes_read = read(worker->controlfd, &controlmsg, 1)) <= 0) {
jbe@0 1309 if (bytes_read == 0 || errno == ECONNRESET) {
jbe@0 1310 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i unexpectedly closed control socket", worker->pool->poolnum, (int)worker->pid);
jbe@0 1311 if (close(worker->controlfd) && errno != EINTR) {
jbe@0 1312 moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 1313 moonbr_terminate_error();
jbe@0 1314 }
jbe@0 1315 worker->controlfd = -1;
jbe@0 1316 moonbr_poll_refresh_needed = 1;
jbe@0 1317 return;
jbe@0 1318 }
jbe@0 1319 if (errno != EINTR) {
jbe@0 1320 moonbr_log(LOG_CRIT, "Unexpected error while reading control socket from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 1321 moonbr_terminate_error();
jbe@0 1322 }
jbe@0 1323 }
jbe@0 1324 }
jbe@0 1325 if (worker->idle) {
jbe@0 1326 moonbr_log(LOG_CRIT, "Unexpected data from supposedly idle child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
jbe@0 1327 moonbr_terminate_error();
jbe@0 1328 }
jbe@0 1329 if (moonbr_debug) {
jbe@0 1330 moonbr_log(LOG_DEBUG, "Received control message from child in pool #%i with PID %i: \"%c\"", worker->pool->poolnum, (int)worker->pid, (int)controlmsg);
jbe@0 1331 }
jbe@0 1332 switch (controlmsg) {
jbe@0 1333 case MOONBR_STATUS_IDLE:
jbe@0 1334 if (moonbr_stat) {
jbe@0 1335 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i reports as idle", worker->pool->poolnum, (int)worker->pid);
jbe@0 1336 }
jbe@0 1337 moonbr_add_idle_worker(worker);
jbe@0 1338 break;
jbe@0 1339 case MOONBR_STATUS_GOODBYE:
jbe@0 1340 if (moonbr_stat) {
jbe@0 1341 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i announced termination", worker->pool->poolnum, (int)worker->pid);
jbe@0 1342 }
jbe@0 1343 if (close(worker->controlfd) && errno != EINTR) {
jbe@0 1344 moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 1345 moonbr_terminate_error();
jbe@0 1346 }
jbe@0 1347 worker->controlfd = -1;
jbe@0 1348 moonbr_poll_refresh_needed = 1;
jbe@0 1349 break;
jbe@0 1350 default:
jbe@0 1351 moonbr_log(LOG_CRIT, "Received illegal data (\"%c\") while reading control socket from child process in pool #%i with PID %i", (int)controlmsg, worker->pool->poolnum, (int)worker->pid);
jbe@0 1352 moonbr_terminate_error();
jbe@0 1353 }
jbe@0 1354 }
jbe@0 1355
jbe@0 1356 /* Handles stderr stream from child process */
jbe@0 1357 static void moonbr_read_errorchannel(struct moonbr_worker *worker) {
jbe@0 1358 char staticbuf[MOONBR_MAXERRORLINELEN+1];
jbe@0 1359 char *buf = worker->errorlinebuf;
jbe@0 1360 if (!buf) buf = staticbuf;
jbe@0 1361 {
jbe@0 1362 ssize_t bytes_read;
jbe@0 1363 while (
jbe@0 1364 (bytes_read = read(
jbe@0 1365 worker->errorfd,
jbe@0 1366 buf + worker->errorlinelen,
jbe@0 1367 MOONBR_MAXERRORLINELEN+1 - worker->errorlinelen
jbe@0 1368 )) <= 0
jbe@0 1369 ) {
jbe@0 1370 if (bytes_read == 0 || errno == ECONNRESET) {
jbe@0 1371 if (moonbr_debug) {
jbe@0 1372 moonbr_log(LOG_DEBUG, "Child process in pool #%i with PID %i closed stderr socket", worker->pool->poolnum, (int)worker->pid);
jbe@0 1373 }
jbe@0 1374 if (close(worker->errorfd) && errno != EINTR) {
jbe@0 1375 moonbr_log(LOG_CRIT, "Error while closing stderr socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 1376 moonbr_terminate_error();
jbe@0 1377 }
jbe@0 1378 worker->errorfd = -1;
jbe@0 1379 moonbr_poll_refresh_needed = 1;
jbe@0 1380 break;
jbe@0 1381 }
jbe@0 1382 if (errno != EINTR) {
jbe@0 1383 moonbr_log(LOG_CRIT, "Unexpected error while reading stderr from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0 1384 moonbr_terminate_error();
jbe@0 1385 }
jbe@0 1386 }
jbe@0 1387 worker->errorlinelen += bytes_read;
jbe@0 1388 }
jbe@0 1389 {
jbe@0 1390 int i;
jbe@0 1391 for (i=0; i<worker->errorlinelen; i++) {
jbe@0 1392 if (buf[i] == '\n') buf[i] = 0;
jbe@0 1393 if (!buf[i]) {
jbe@0 1394 if (worker->errorlineovf) {
jbe@0 1395 worker->errorlineovf = 0;
jbe@0 1396 } else {
jbe@283 1397 moonbr_log(LOG_WARNING, "[Pool #%i, PID %i] %s", worker->pool->poolnum, (int)worker->pid, buf);
jbe@0 1398 }
jbe@0 1399 worker->errorlinelen -= i+1;
jbe@0 1400 memmove(buf, buf+i+1, worker->errorlinelen);
jbe@0 1401 i = -1;
jbe@0 1402 }
jbe@0 1403 }
jbe@0 1404 if (i > MOONBR_MAXERRORLINELEN) {
jbe@0 1405 buf[MOONBR_MAXERRORLINELEN] = 0;
jbe@0 1406 if (!worker->errorlineovf) {
jbe@283 1407 moonbr_log(LOG_WARNING, "[Pool #%i, PID %i](line has been truncated) %s", worker->pool->poolnum, (int)worker->pid, buf);
jbe@0 1408 }
jbe@0 1409 worker->errorlinelen = 0;
jbe@0 1410 worker->errorlineovf = 1;
jbe@0 1411 }
jbe@0 1412 }
jbe@0 1413 if (!worker->errorlinebuf && worker->errorlinelen) { /* allocate buffer on heap only if necessary */
jbe@0 1414 worker->errorlinebuf = malloc((MOONBR_MAXERRORLINELEN+1) * sizeof(char));
jbe@0 1415 if (!worker->errorlinebuf) {
jbe@0 1416 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0 1417 moonbr_terminate_error();
jbe@0 1418 }
jbe@0 1419 memcpy(worker->errorlinebuf, staticbuf, worker->errorlinelen);
jbe@0 1420 }
jbe@0 1421 }
jbe@0 1422
jbe@0 1423
jbe@0 1424 /*** Handler for incoming connections ***/
jbe@0 1425
jbe@0 1426 /* Accepts one or more incoming connections on listener socket and passes it to worker(s) popped from idle queue */
jbe@0 1427 static void moonbr_connect(struct moonbr_pool *pool) {
jbe@0 1428 struct moonbr_listener *listener = moonbr_pop_connected_listener(pool);
jbe@0 1429 struct moonbr_worker *worker;
jbe@274 1430 if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@127 1431 worker = moonbr_pop_idle_worker(pool);
jbe@274 1432 if (listener->type_specific.interval.main) {
jbe@274 1433 if (moonbr_stat) {
jbe@274 1434 moonbr_log(LOG_INFO, "Dispatching main thread \"%s\" of pool #%i to PID %i", listener->type_specific.interval.name, listener->pool->poolnum, (int)worker->pid);
jbe@274 1435 }
jbe@274 1436 worker->main = 1;
jbe@274 1437 } else {
jbe@274 1438 if (moonbr_stat) {
jbe@274 1439 moonbr_log(LOG_INFO, "Dispatching interval timer \"%s\" of pool #%i to PID %i", listener->type_specific.interval.name, listener->pool->poolnum, (int)worker->pid);
jbe@274 1440 }
jbe@274 1441 worker->restart_interval_listener = listener;
jbe@127 1442 }
jbe@127 1443 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
jbe@274 1444 /* do not push listener to queue of idle listeners (yet) */
jbe@125 1445 } else {
jbe@125 1446 int peerfd;
jbe@0 1447 do {
jbe@214 1448 #if defined(__linux__) && !defined(_GNU_SOURCE)
jbe@212 1449 peerfd = accept(listener->listenfd, NULL, NULL);
jbe@212 1450 if (peerfd != -1) {
jbe@212 1451 if (fcntl(peerfd, F_SETFD, FD_CLOEXEC) == -1) {
jbe@212 1452 moonbr_log(LOG_ERR, "Error in fcntl() call: %s", strerror(errno));
jbe@212 1453 moonbr_terminate_error();
jbe@212 1454 }
jbe@212 1455 }
jbe@214 1456 #else
jbe@214 1457 peerfd = accept4(listener->listenfd, NULL, NULL, SOCK_CLOEXEC);
jbe@214 1458 #endif
jbe@0 1459 if (peerfd == -1) {
jbe@0 1460 if (errno == EWOULDBLOCK) {
jbe@0 1461 break;
jbe@0 1462 } else if (errno == ECONNABORTED) {
jbe@125 1463 moonbr_log(LOG_WARNING, "Connection aborted before accepting it");
jbe@0 1464 break;
jbe@0 1465 } else if (errno != EINTR) {
jbe@0 1466 moonbr_log(LOG_ERR, "Could not accept socket connection: %s", strerror(errno));
jbe@0 1467 moonbr_terminate_error();
jbe@0 1468 }
jbe@0 1469 } else {
jbe@0 1470 worker = moonbr_pop_idle_worker(pool);
jbe@0 1471 if (moonbr_stat) {
jbe@125 1472 moonbr_log(LOG_INFO, "Dispatching connection for pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
jbe@0 1473 }
jbe@124 1474 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, peerfd, listener);
jbe@0 1475 if (close(peerfd) && errno != EINTR) {
jbe@0 1476 moonbr_log(LOG_ERR, "Could not close incoming socket connection in parent process: %s", strerror(errno));
jbe@0 1477 moonbr_terminate_error();
jbe@0 1478 }
jbe@0 1479 }
jbe@0 1480 } while (pool->first_idle_worker);
jbe@0 1481 moonbr_add_idle_listener(listener);
jbe@0 1482 }
jbe@0 1483 }
jbe@0 1484
jbe@0 1485
jbe@0 1486 /*** Functions to initialize and restart interval timers ***/
jbe@0 1487
jbe@0 1488 /* Initializes all interval timers */
jbe@0 1489 static void moonbr_interval_initialize() {
jbe@0 1490 struct timeval now;
jbe@0 1491 struct moonbr_pool *pool;
jbe@0 1492 moonbr_now(&now);
jbe@0 1493 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0 1494 int i;
jbe@0 1495 for (i=0; i<pool->listener_count; i++) {
jbe@0 1496 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 1497 if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@0 1498 timeradd(
jbe@0 1499 &now,
jbe@125 1500 &listener->type_specific.interval.delay,
jbe@125 1501 &listener->type_specific.interval.wakeup
jbe@0 1502 );
jbe@0 1503 }
jbe@0 1504 }
jbe@0 1505 }
jbe@0 1506 }
jbe@0 1507
jbe@0 1508 /* If necessary, restarts interval timers and queues interval listener as idle after a worker changed status */
jbe@0 1509 static void moonbr_interval_restart(
jbe@0 1510 struct moonbr_worker *worker,
jbe@0 1511 struct timeval *now /* passed to synchronize with moonbr_run() function */
jbe@0 1512 ) {
jbe@0 1513 struct moonbr_listener *listener = worker->restart_interval_listener;
jbe@0 1514 if (listener) {
jbe@0 1515 moonbr_add_idle_listener(listener);
jbe@0 1516 worker->restart_interval_listener = NULL;
jbe@125 1517 if (listener->type_specific.interval.strict) {
jbe@0 1518 timeradd(
jbe@125 1519 &listener->type_specific.interval.wakeup,
jbe@125 1520 &listener->type_specific.interval.delay,
jbe@125 1521 &listener->type_specific.interval.wakeup
jbe@0 1522 );
jbe@125 1523 if (timercmp(&listener->type_specific.interval.wakeup, now, <)) {
jbe@125 1524 listener->type_specific.interval.wakeup = *now;
jbe@0 1525 }
jbe@0 1526 } else {
jbe@0 1527 timeradd(
jbe@0 1528 now,
jbe@125 1529 &listener->type_specific.interval.delay,
jbe@125 1530 &listener->type_specific.interval.wakeup
jbe@0 1531 );
jbe@0 1532 }
jbe@0 1533 }
jbe@0 1534 }
jbe@0 1535
jbe@0 1536
jbe@0 1537 /*** Main loop and helper functions ***/
jbe@0 1538
jbe@0 1539 /* Stores the earliest required wakeup time in 'wait' variable */
jbe@0 1540 static void moonbr_calc_wait(struct timeval *wait, struct timeval *wakeup) {
jbe@0 1541 if (!timerisset(wait) || timercmp(wakeup, wait, <)) *wait = *wakeup;
jbe@0 1542 }
jbe@0 1543
jbe@0 1544 /* Main loop of Moonbridge system (including initialization of signal handlers and polling structures) */
jbe@0 1545 static void moonbr_run(lua_State *L) {
jbe@0 1546 struct timeval now;
jbe@0 1547 struct moonbr_pool *pool;
jbe@0 1548 struct moonbr_worker *worker;
jbe@0 1549 struct moonbr_worker *next_worker; /* needed when worker is removed during iteration of workers */
jbe@0 1550 struct moonbr_listener *listener;
jbe@0 1551 struct moonbr_listener *next_listener; /* needed when listener is removed during iteration of listeners */
jbe@0 1552 int i;
jbe@0 1553 moonbr_poll_init(); /* must be executed before moonbr_signal_init() */
jbe@0 1554 moonbr_signal_init();
jbe@0 1555 moonbr_interval_initialize();
jbe@0 1556 moonbr_pstate = MOONBR_PSTATE_RUNNING;
jbe@0 1557 while (1) {
jbe@0 1558 struct timeval wait = {0, }; /* point in time when premature wakeup of poll() is required */
jbe@0 1559 if (moonbr_cond_interrupt) {
jbe@0 1560 moonbr_log(LOG_WARNING, "Fast shutdown requested");
jbe@0 1561 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
jbe@0 1562 }
jbe@276 1563 if (moonbr_cond_terminate) {
jbe@276 1564 moonbr_initiate_shutdown();
jbe@276 1565 moonbr_cond_terminate = 0;
jbe@276 1566 }
jbe@0 1567 moonbr_cond_child = 0; /* must not be reset between moonbr_try_destroy_worker() and poll() */
jbe@0 1568 moonbr_now(&now);
jbe@0 1569 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0 1570 int terminated_worker_count = 0; /* allows shortcut for new worker creation */
jbe@0 1571 /* terminate idle workers when expired */
jbe@0 1572 if (timerisset(&pool->idle_timeout)) {
jbe@0 1573 while ((worker = pool->first_idle_worker) != NULL) {
jbe@0 1574 if (timercmp(&worker->idle_expiration, &now, >)) break;
jbe@0 1575 moonbr_pop_idle_worker(pool);
jbe@0 1576 moonbr_terminate_idle_worker(worker);
jbe@0 1577 }
jbe@0 1578 }
jbe@0 1579 /* mark listeners as connected when incoming connection is pending */
jbe@0 1580 for (listener=pool->first_idle_listener; listener; listener=next_listener) {
jbe@0 1581 next_listener = listener->next_listener; /* extra variable necessary due to changing list */
jbe@0 1582 if (listener->pollidx != -1) {
jbe@0 1583 if (moonbr_poll_fds[listener->pollidx].revents) {
jbe@0 1584 moonbr_poll_fds[listener->pollidx].revents = 0;
jbe@0 1585 moonbr_remove_idle_listener(listener);
jbe@0 1586 moonbr_add_connected_listener(listener);
jbe@0 1587 }
jbe@127 1588 } else if (
jbe@127 1589 listener->proto != MOONBR_PROTO_INTERVAL ||
jbe@127 1590 !timercmp(&listener->type_specific.interval.wakeup, &now, >)
jbe@127 1591 ) {
jbe@127 1592 moonbr_remove_idle_listener(listener);
jbe@127 1593 moonbr_add_connected_listener(listener);
jbe@0 1594 }
jbe@0 1595 }
jbe@0 1596 /* process input from child processes */
jbe@0 1597 for (i=0; i<moonbr_poll_worker_count; i++) {
jbe@0 1598 if (moonbr_poll_worker_fds[i].revents) {
jbe@0 1599 moonbr_poll_worker_fds[i].revents = 0;
jbe@0 1600 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[i];
jbe@0 1601 switch (poll_worker->channel) {
jbe@0 1602 case MOONBR_POLL_WORKER_CONTROLCHANNEL:
jbe@0 1603 moonbr_read_controlchannel(poll_worker->worker);
jbe@0 1604 moonbr_interval_restart(poll_worker->worker, &now);
jbe@0 1605 break;
jbe@0 1606 case MOONBR_POLL_WORKER_ERRORCHANNEL:
jbe@0 1607 moonbr_read_errorchannel(poll_worker->worker);
jbe@0 1608 break;
jbe@0 1609 }
jbe@0 1610 }
jbe@0 1611 }
jbe@0 1612 /* collect dead child processes */
jbe@0 1613 for (worker=pool->first_worker; worker; worker=next_worker) {
jbe@0 1614 next_worker = worker->next_worker; /* extra variable necessary due to changing list */
jbe@0 1615 switch (moonbr_try_destroy_worker(worker)) {
jbe@0 1616 case MOONBR_DESTROY_PREPARE:
jbe@0 1617 pool->use_fork_error_wakeup = 1;
jbe@0 1618 break;
jbe@0 1619 case MOONBR_DESTROY_IDLE_OR_ASSIGNED:
jbe@0 1620 terminated_worker_count++;
jbe@0 1621 break;
jbe@0 1622 }
jbe@0 1623 }
jbe@0 1624 if (!moonbr_shutdown_in_progress) {
jbe@130 1625 /* connect listeners with idle workers */
jbe@0 1626 while (pool->first_connected_listener && pool->first_idle_worker) {
jbe@0 1627 moonbr_connect(pool);
jbe@0 1628 }
jbe@130 1629 /* create new worker processes */
jbe@130 1630 while (
jbe@130 1631 pool->total_worker_count < pool->max_fork && (
jbe@130 1632 pool->unassigned_worker_count < pool->pre_fork ||
jbe@130 1633 pool->total_worker_count < pool->min_fork
jbe@130 1634 )
jbe@130 1635 ) {
jbe@130 1636 if (pool->use_fork_error_wakeup) {
jbe@130 1637 if (timercmp(&pool->fork_error_wakeup, &now, >)) {
jbe@130 1638 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
jbe@130 1639 break;
jbe@130 1640 }
jbe@130 1641 } else {
jbe@130 1642 if (terminated_worker_count) {
jbe@130 1643 terminated_worker_count--;
jbe@130 1644 } else if (timercmp(&pool->fork_wakeup, &now, >)) {
jbe@130 1645 moonbr_calc_wait(&wait, &pool->fork_wakeup);
jbe@130 1646 break;
jbe@130 1647 }
jbe@0 1648 }
jbe@130 1649 if (moonbr_create_worker(pool, L)) {
jbe@130 1650 /* on error, enforce error delay */
jbe@130 1651 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
jbe@130 1652 pool->use_fork_error_wakeup = 1;
jbe@130 1653 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
jbe@130 1654 break;
jbe@130 1655 } else {
jbe@130 1656 /* normal fork delay on success */
jbe@130 1657 timeradd(&now, &pool->fork_delay, &pool->fork_wakeup);
jbe@130 1658 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
jbe@130 1659 pool->use_fork_error_wakeup = 0; /* gets set later if error occures during preparation */
jbe@130 1660 }
jbe@130 1661 }
jbe@130 1662 /* terminate excessive worker processes */
jbe@130 1663 while (
jbe@130 1664 pool->total_worker_count > pool->min_fork &&
jbe@130 1665 pool->idle_worker_count > pool->pre_fork
jbe@130 1666 ) {
jbe@130 1667 if (timerisset(&pool->exit_wakeup)) {
jbe@130 1668 if (timercmp(&pool->exit_wakeup, &now, >)) {
jbe@130 1669 moonbr_calc_wait(&wait, &pool->exit_wakeup);
jbe@130 1670 break;
jbe@130 1671 }
jbe@130 1672 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
jbe@130 1673 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
jbe@130 1674 } else {
jbe@130 1675 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
jbe@0 1676 break;
jbe@0 1677 }
jbe@0 1678 }
jbe@130 1679 if (!(
jbe@130 1680 pool->total_worker_count > pool->min_fork &&
jbe@130 1681 pool->idle_worker_count > pool->pre_fork
jbe@130 1682 )) {
jbe@130 1683 timerclear(&pool->exit_wakeup); /* timer gets restarted later when there are excessive workers */
jbe@0 1684 }
jbe@0 1685 }
jbe@0 1686 /* optionally output worker count stats */
jbe@0 1687 if (moonbr_stat && pool->worker_count_stat) {
jbe@0 1688 pool->worker_count_stat = 0;
jbe@0 1689 moonbr_log(
jbe@0 1690 LOG_INFO,
jbe@0 1691 "Worker count for pool #%i: %i idle, %i assigned, %i total",
jbe@0 1692 pool->poolnum, pool->idle_worker_count,
jbe@0 1693 pool->total_worker_count - pool->unassigned_worker_count,
jbe@0 1694 pool->total_worker_count);
jbe@0 1695 }
jbe@0 1696 /* calculate wakeup time for interval listeners */
jbe@0 1697 for (listener=pool->first_idle_listener; listener; listener=listener->next_listener) {
jbe@0 1698 if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@125 1699 moonbr_calc_wait(&wait, &listener->type_specific.interval.wakeup);
jbe@0 1700 }
jbe@0 1701 }
jbe@0 1702 /* calculate wakeup time for idle workers (only first idle worker is significant) */
jbe@0 1703 if (timerisset(&pool->idle_timeout) && pool->first_idle_worker) {
jbe@0 1704 moonbr_calc_wait(&wait, &pool->first_idle_worker->idle_expiration);
jbe@0 1705 }
jbe@0 1706 }
jbe@130 1707 /* terminate idle workers in case of shutdown and check if shutdown is complete */
jbe@0 1708 if (moonbr_shutdown_in_progress) {
jbe@195 1709 int remaining = 0;
jbe@0 1710 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@195 1711 while (pool->idle_worker_count) {
jbe@195 1712 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
jbe@130 1713 }
jbe@195 1714 if (pool->first_worker) remaining = 1;
jbe@0 1715 }
jbe@195 1716 if (!remaining) {
jbe@0 1717 moonbr_log(LOG_INFO, "All worker threads have terminated");
jbe@0 1718 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
jbe@0 1719 }
jbe@0 1720 }
jbe@0 1721 if (moonbr_poll_refresh_needed) moonbr_poll_refresh();
jbe@0 1722 moonbr_cond_poll = 1;
jbe@0 1723 if (!moonbr_cond_child && !moonbr_cond_terminate && !moonbr_cond_interrupt) {
jbe@0 1724 int timeout;
jbe@0 1725 if (timerisset(&wait)) {
jbe@0 1726 if (timercmp(&wait, &now, <)) {
jbe@0 1727 moonbr_log(LOG_CRIT, "Internal error (should not happen): Future is in the past");
jbe@0 1728 moonbr_terminate_error();
jbe@0 1729 }
jbe@0 1730 timersub(&wait, &now, &wait);
jbe@0 1731 timeout = wait.tv_sec * 1000 + wait.tv_usec / 1000;
jbe@0 1732 } else {
jbe@0 1733 timeout = INFTIM;
jbe@0 1734 }
jbe@0 1735 if (moonbr_debug) {
jbe@0 1736 moonbr_log(LOG_DEBUG, "Waiting for I/O");
jbe@0 1737 }
jbe@0 1738 poll(moonbr_poll_fds, moonbr_poll_fds_count, timeout);
jbe@0 1739 } else {
jbe@0 1740 if (moonbr_debug) {
jbe@0 1741 moonbr_log(LOG_DEBUG, "Do not wait for I/O");
jbe@0 1742 }
jbe@0 1743 }
jbe@0 1744 moonbr_cond_poll = 0;
jbe@0 1745 moonbr_poll_reset_signal();
jbe@0 1746 }
jbe@0 1747 }
jbe@0 1748
jbe@0 1749
jbe@0 1750 /*** Lua interface ***/
jbe@0 1751
jbe@0 1752 static int moonbr_lua_panic(lua_State *L) {
jbe@0 1753 const char *errmsg;
jbe@0 1754 errmsg = lua_tostring(L, -1);
jbe@0 1755 if (!errmsg) {
jbe@0 1756 if (lua_isnoneornil(L, -1)) errmsg = "(error message is nil)";
jbe@0 1757 else errmsg = "(error message is not a string)";
jbe@0 1758 }
jbe@0 1759 if (moonbr_pstate == MOONBR_PSTATE_FORKED) {
jbe@0 1760 fprintf(stderr, "Uncaught Lua error: %s\n", errmsg);
jbe@0 1761 exit(1);
jbe@0 1762 } else {
jbe@0 1763 moonbr_log(LOG_CRIT, "Uncaught Lua error: %s", errmsg);
jbe@0 1764 moonbr_terminate_error();
jbe@0 1765 }
jbe@0 1766 return 0;
jbe@0 1767 }
jbe@0 1768
jbe@0 1769 static int moonbr_addtraceback(lua_State *L) {
jbe@0 1770 luaL_traceback(L, L, luaL_tolstring(L, 1, NULL), 1);
jbe@0 1771 return 1;
jbe@0 1772 }
jbe@0 1773
jbe@0 1774 /* Memory allocator that allows limiting memory consumption */
jbe@0 1775 static void *moonbr_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
jbe@0 1776 (void)ud; /* not used */
jbe@0 1777 if (nsize == 0) {
jbe@0 1778 if (ptr) {
jbe@0 1779 moonbr_memory_usage -= osize;
jbe@0 1780 free(ptr);
jbe@0 1781 }
jbe@0 1782 return NULL;
jbe@0 1783 } else if (ptr) {
jbe@0 1784 if (
jbe@0 1785 moonbr_memory_limit &&
jbe@0 1786 nsize > osize &&
jbe@0 1787 moonbr_memory_usage + (nsize - osize) > moonbr_memory_limit
jbe@0 1788 ) {
jbe@0 1789 return NULL;
jbe@0 1790 } else {
jbe@0 1791 ptr = realloc(ptr, nsize);
jbe@0 1792 if (ptr) moonbr_memory_usage += nsize - osize;
jbe@0 1793 }
jbe@0 1794 } else {
jbe@0 1795 if (
jbe@0 1796 moonbr_memory_limit &&
jbe@0 1797 moonbr_memory_usage + nsize > moonbr_memory_limit
jbe@0 1798 ) {
jbe@0 1799 return NULL;
jbe@0 1800 } else {
jbe@0 1801 ptr = realloc(ptr, nsize);
jbe@0 1802 if (ptr) moonbr_memory_usage += nsize;
jbe@0 1803 }
jbe@0 1804 }
jbe@0 1805 return ptr;
jbe@0 1806 }
jbe@0 1807
jbe@66 1808 static int moonbr_lua_tonatural(lua_State *L, int idx) {
jbe@66 1809 int isnum;
jbe@66 1810 lua_Number n;
jbe@66 1811 n = lua_tonumberx(L, idx, &isnum);
jbe@66 1812 if (isnum && n>=0 && n<INT_MAX && (lua_Number)(int)n == n) return n;
jbe@66 1813 else return -1;
jbe@66 1814 }
jbe@66 1815
jbe@66 1816 static int moonbr_lua_totimeval(lua_State *L, int idx, struct timeval *value) {
jbe@66 1817 int isnum;
jbe@66 1818 lua_Number n;
jbe@66 1819 n = lua_tonumberx(L, idx, &isnum);
jbe@66 1820 if (isnum && n>=0 && n<=100000000) {
jbe@66 1821 value->tv_sec = n;
jbe@66 1822 value->tv_usec = 1e6 * (n - value->tv_sec);
jbe@66 1823 return 1;
jbe@66 1824 } else {
jbe@66 1825 return 0;
jbe@66 1826 }
jbe@66 1827 }
jbe@66 1828
jbe@0 1829 static int moonbr_timeout(lua_State *L) {
jbe@0 1830 struct itimerval oldval;
jbe@0 1831 if (lua_isnoneornil(L, 1) && lua_isnoneornil(L, 2)) {
jbe@0 1832 getitimer(ITIMER_REAL, &oldval);
jbe@0 1833 } else {
jbe@0 1834 struct itimerval newval = {};
jbe@39 1835 timerclear(&newval.it_interval);
jbe@39 1836 timerclear(&newval.it_value);
jbe@0 1837 if (lua_toboolean(L, 1)) {
jbe@0 1838 luaL_argcheck(
jbe@0 1839 L, moonbr_lua_totimeval(L, 1, &newval.it_value), 1,
jbe@0 1840 "interval in seconds expected"
jbe@0 1841 );
jbe@0 1842 }
jbe@0 1843 if (lua_isnoneornil(L, 2)) {
jbe@0 1844 if (setitimer(ITIMER_REAL, &newval, &oldval)) {
jbe@0 1845 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@0 1846 moonbr_terminate_error();
jbe@0 1847 }
jbe@0 1848 } else {
jbe@0 1849 getitimer(ITIMER_REAL, &oldval);
jbe@39 1850 if (!timerisset(&oldval.it_value)) {
jbe@39 1851 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@39 1852 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@39 1853 moonbr_terminate_error();
jbe@39 1854 }
jbe@39 1855 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
jbe@39 1856 timerclear(&newval.it_value);
jbe@39 1857 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@39 1858 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@39 1859 moonbr_terminate_error();
jbe@39 1860 }
jbe@39 1861 } else if (timercmp(&newval.it_value, &oldval.it_value, <)) {
jbe@0 1862 struct itimerval remval;
jbe@0 1863 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@0 1864 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@0 1865 moonbr_terminate_error();
jbe@0 1866 }
jbe@0 1867 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
jbe@0 1868 getitimer(ITIMER_REAL, &remval);
jbe@0 1869 timersub(&oldval.it_value, &newval.it_value, &newval.it_value);
jbe@0 1870 timeradd(&newval.it_value, &remval.it_value, &newval.it_value);
jbe@0 1871 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@0 1872 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@0 1873 moonbr_terminate_error();
jbe@0 1874 }
jbe@0 1875 } else {
jbe@0 1876 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
jbe@0 1877 }
jbe@0 1878 return lua_gettop(L) - 1;
jbe@0 1879 }
jbe@0 1880 }
jbe@115 1881 lua_pushnumber(L, oldval.it_value.tv_sec + 1e-6 * oldval.it_value.tv_usec);
jbe@0 1882 return 1;
jbe@0 1883 }
jbe@0 1884
jbe@264 1885 #define moonbr_listen_init_pool_forkoption(luaname, cname, defval) do { \
jbe@0 1886 lua_getfield(L, 2, luaname); \
jbe@0 1887 pool->cname = lua_isnil(L, -1) ? (defval) : moonbr_lua_tonatural(L, -1); \
jbe@0 1888 } while(0)
jbe@0 1889
jbe@0 1890 #define moonbr_listen_init_pool_timeoption(luaname, cname, defval, defvalu) ( \
jbe@0 1891 lua_getfield(L, 2, luaname), \
jbe@0 1892 lua_isnil(L, -1) ? ( \
jbe@0 1893 pool->cname.tv_sec = (defval), pool->cname.tv_usec = (defvalu), \
jbe@0 1894 1 \
jbe@0 1895 ) : ( \
jbe@0 1896 (lua_isboolean(L, -1) && !lua_toboolean(L, -1)) ? ( \
jbe@0 1897 pool->cname.tv_sec = 0, pool->cname.tv_usec = 0, \
jbe@0 1898 1 \
jbe@0 1899 ) : ( \
jbe@0 1900 moonbr_lua_totimeval(L, -1, &pool->cname) \
jbe@0 1901 ) \
jbe@0 1902 ) \
jbe@0 1903 )
jbe@0 1904
jbe@0 1905 static int moonbr_listen_init_pool(lua_State *L) {
jbe@0 1906 struct moonbr_pool *pool;
jbe@0 1907 const char *proto;
jbe@274 1908 int is_main;
jbe@0 1909 int i;
jbe@127 1910 int dynamic = 0; /* nonzero = listeners exist which require dynamic worker creation */
jbe@0 1911 pool = lua_touserdata(L, 1);
jbe@0 1912 for (i=0; i<pool->listener_count; i++) {
jbe@0 1913 struct moonbr_listener *listener = &pool->listener[i];
jbe@0 1914 lua_settop(L, 2);
jbe@3 1915 #if LUA_VERSION_NUM >= 503
jbe@3 1916 lua_geti(L, 2, i+1);
jbe@3 1917 #else
jbe@0 1918 lua_pushinteger(L, i+1);
jbe@0 1919 lua_gettable(L, 2);
jbe@3 1920 #endif
jbe@0 1921 lua_getfield(L, 3, "proto");
jbe@0 1922 proto = lua_tostring(L, -1);
jbe@274 1923 is_main = !strcmp(proto, "main");
jbe@274 1924 if (proto && (is_main || !strcmp(proto, "interval"))) {
jbe@0 1925 listener->proto = MOONBR_PROTO_INTERVAL;
jbe@0 1926 lua_getfield(L, 3, "name");
jbe@0 1927 {
jbe@0 1928 const char *name = lua_tostring(L, -1);
jbe@0 1929 if (name) {
jbe@211 1930 char *name_dup = strdup(name);
jbe@211 1931 if (!name_dup) {
jbe@0 1932 moonbr_log(LOG_CRIT, "Memory allocation_error");
jbe@0 1933 moonbr_terminate_error();
jbe@0 1934 }
jbe@211 1935 listener->type_specific.interval.name = name_dup;
jbe@0 1936 }
jbe@0 1937 }
jbe@274 1938 if (is_main) {
jbe@274 1939 listener->type_specific.interval.main = 1;
jbe@274 1940 } else {
jbe@274 1941 listener->type_specific.interval.main = 0;
jbe@274 1942 dynamic = 1;
jbe@274 1943 lua_getfield(L, 3, "delay");
jbe@274 1944 if (
jbe@274 1945 !moonbr_lua_totimeval(L, -1, &listener->type_specific.interval.delay) ||
jbe@274 1946 !timerisset(&listener->type_specific.interval.delay)
jbe@274 1947 ) {
jbe@274 1948 luaL_error(L, "No valid interval delay specified; use listen{{proto=\"interval\", delay=...}, ...}");
jbe@274 1949 }
jbe@274 1950 lua_getfield(L, 3, "strict");
jbe@274 1951 if (!lua_isnil(L, -1)) {
jbe@274 1952 if (lua_isboolean(L, -1)) {
jbe@274 1953 if (lua_toboolean(L, -1)) listener->type_specific.interval.strict = 1;
jbe@274 1954 } else {
jbe@274 1955 luaL_error(L, "Option \"strict\" must be a boolean if set; use listen{{proto=\"interval\", strict=true, ...}, ...}");
jbe@274 1956 }
jbe@0 1957 }
jbe@0 1958 }
jbe@0 1959 } else if (proto && !strcmp(proto, "local")) {
jbe@125 1960 const char *path;
jbe@125 1961 const int path_maxlen = (
jbe@125 1962 sizeof(listener->type_specific.socket.addr.addr_un) -
jbe@125 1963 ((void *)listener->type_specific.socket.addr.addr_un.sun_path - (void *)&listener->type_specific.socket.addr.addr_un)
jbe@125 1964 ) - 1; /* one byte for termination */
jbe@127 1965 dynamic = 1;
jbe@0 1966 listener->proto = MOONBR_PROTO_LOCAL;
jbe@0 1967 lua_getfield(L, 3, "path");
jbe@125 1968 path = lua_tostring(L, -1);
jbe@125 1969 if (!path) {
jbe@125 1970 luaL_error(L, "No valid path specified for local socket; use listen{{proto=\"local\", path=...}, ...}");
jbe@125 1971 }
jbe@125 1972 if (strlen(path) > path_maxlen) {
jbe@125 1973 luaL_error(L, "Path name for local socket exceeded maximum length of %i characters", path_maxlen);
jbe@125 1974 }
jbe@309 1975 listener->type_specific.socket.addr.addr_un.sun_family = AF_LOCAL;
jbe@125 1976 strcpy(listener->type_specific.socket.addr.addr_un.sun_path, path);
jbe@309 1977 listener->type_specific.socket.addrlen = sizeof(listener->type_specific.socket.addr.addr_un);
jbe@125 1978 } else if (proto && !strcmp(proto, "tcp")) {
jbe@125 1979 const char *host, *port;
jbe@125 1980 struct addrinfo hints = { 0, };
jbe@125 1981 struct addrinfo *res, *addrinfo;
jbe@125 1982 int errcode;
jbe@125 1983 const char *ip;
jbe@127 1984 dynamic = 1;
jbe@125 1985 lua_getfield(L, 3, "host");
jbe@125 1986 host = lua_isnil(L, -1) ? "::" : lua_tostring(L, -1);
jbe@125 1987 if (!host) {
jbe@125 1988 luaL_error(L, "No host specified; use listen{{proto=\"tcp\", host=...}, ...}");
jbe@125 1989 }
jbe@125 1990 lua_getfield(L, 3, "port");
jbe@125 1991 port = lua_tostring(L, -1);
jbe@125 1992 if (!port) {
jbe@125 1993 luaL_error(L, "No port specified; use listen{{proto=\"tcp\", host=...}, ...}");
jbe@125 1994 }
jbe@125 1995 hints.ai_family = AF_UNSPEC;
jbe@125 1996 hints.ai_socktype = SOCK_STREAM;
jbe@125 1997 hints.ai_protocol = IPPROTO_TCP;
jbe@125 1998 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
jbe@125 1999 errcode = getaddrinfo(host, port, &hints, &res);
jbe@125 2000 if (errcode) {
jbe@125 2001 freeaddrinfo(res);
jbe@125 2002 if (errcode == EAI_SYSTEM) {
jbe@213 2003 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
jbe@125 2004 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
jbe@125 2005 luaL_error(L, "Could not resolve host: %s: %s", gai_strerror(errcode), errmsg);
jbe@125 2006 } else {
jbe@125 2007 luaL_error(L, "Could not resolve host: %s", gai_strerror(errcode));
jbe@0 2008 }
jbe@0 2009 }
jbe@125 2010 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
jbe@125 2011 if (addrinfo->ai_family == AF_INET6) goto moonbr_listen_init_pool_found;
jbe@125 2012 }
jbe@125 2013 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
jbe@125 2014 if (addrinfo->ai_family == AF_INET) goto moonbr_listen_init_pool_found;
jbe@0 2015 }
jbe@125 2016 addrinfo = res;
jbe@125 2017 moonbr_listen_init_pool_found:
jbe@125 2018 if (addrinfo->ai_addrlen > sizeof(listener->type_specific.socket.addr)) {
jbe@125 2019 moonbr_log(LOG_CRIT, "Size of ai_addrlen is unexpectedly big (should not happen)");
jbe@125 2020 moonbr_terminate_error();
jbe@0 2021 }
jbe@125 2022 memcpy(&listener->type_specific.socket.addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
jbe@125 2023 listener->type_specific.socket.addrlen = addrinfo->ai_addrlen;
jbe@125 2024 switch (addrinfo->ai_family) {
jbe@125 2025 case AF_INET6:
jbe@125 2026 ip = inet_ntop(
jbe@125 2027 addrinfo->ai_family,
jbe@125 2028 &((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_addr,
jbe@125 2029 listener->proto_specific.tcp.ip,
jbe@125 2030 INET6_ADDRSTRLEN
jbe@125 2031 );
jbe@125 2032 if (!ip) {
jbe@125 2033 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
jbe@125 2034 moonbr_terminate_error();
jbe@125 2035 }
jbe@125 2036 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_port);
jbe@125 2037 break;
jbe@125 2038 case AF_INET:
jbe@125 2039 ip = inet_ntop(
jbe@125 2040 addrinfo->ai_family,
jbe@125 2041 &((struct sockaddr_in *)addrinfo->ai_addr)->sin_addr,
jbe@125 2042 listener->proto_specific.tcp.ip,
jbe@307 2043 INET_ADDRSTRLEN
jbe@125 2044 );
jbe@125 2045 if (!ip) {
jbe@125 2046 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
jbe@125 2047 moonbr_terminate_error();
jbe@125 2048 }
jbe@125 2049 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in *)addrinfo->ai_addr)->sin_port);
jbe@125 2050 break;
jbe@125 2051 default:
jbe@125 2052 strcpy(listener->proto_specific.tcp.ip, "unknown");
jbe@125 2053 listener->proto_specific.tcp.port = 0;
jbe@0 2054 }
jbe@125 2055 listener->proto = MOONBR_PROTO_TCP;
jbe@125 2056 } else if (proto) {
jbe@125 2057 luaL_error(L, "Unknown protocol \"%s\"", proto);
jbe@125 2058 } else {
jbe@125 2059 luaL_error(L, "No valid protocol specified; use listen{{proto=..., ...}, ...}");
jbe@0 2060 }
jbe@0 2061 }
jbe@0 2062 lua_settop(L, 2);
jbe@127 2063 if (dynamic) {
jbe@127 2064 moonbr_listen_init_pool_forkoption("pre_fork", pre_fork, 1);
jbe@127 2065 moonbr_listen_init_pool_forkoption("min_fork", min_fork, pool->pre_fork > 2 ? pool->pre_fork : 2);
jbe@127 2066 moonbr_listen_init_pool_forkoption("max_fork", max_fork, pool->min_fork > 16 ? pool->min_fork : 16);
jbe@127 2067 if (!moonbr_listen_init_pool_timeoption("fork_delay", fork_delay, 0, 250000)) {
jbe@127 2068 luaL_error(L, "Option \"fork_delay\" is expected to be a non-negative number");
jbe@127 2069 }
jbe@127 2070 if (!moonbr_listen_init_pool_timeoption("fork_error_delay", fork_error_delay, 2, 0)) {
jbe@127 2071 luaL_error(L, "Option \"fork_error_delay\" is expected to be a non-negative number");
jbe@127 2072 }
jbe@127 2073 if (!moonbr_listen_init_pool_timeoption("exit_delay", exit_delay, 60, 0)) {
jbe@127 2074 luaL_error(L, "Option \"exit_delay\" is expected to be a non-negative number");
jbe@127 2075 }
jbe@127 2076 if (timercmp(&pool->fork_error_delay, &pool->fork_delay, <)) {
jbe@127 2077 pool->fork_error_delay = pool->fork_delay;
jbe@127 2078 }
jbe@127 2079 if (!moonbr_listen_init_pool_timeoption("idle_timeout", idle_timeout, 0, 0)) {
jbe@127 2080 luaL_error(L, "Option \"idle_timeout\" is expected to be a non-negative number");
jbe@127 2081 }
jbe@127 2082 } else {
jbe@127 2083 pool->pre_fork = 0;
jbe@127 2084 pool->min_fork = pool->listener_count;
jbe@127 2085 pool->max_fork = pool->listener_count;
jbe@0 2086 }
jbe@0 2087 lua_getfield(L, 2, "memory_limit");
jbe@0 2088 if (!lua_isnil(L, -1)) {
jbe@0 2089 int isnum;
jbe@0 2090 lua_Number n;
jbe@0 2091 n = lua_tonumberx(L, -1, &isnum);
jbe@0 2092 if (n < 0 || !isnum) {
jbe@0 2093 luaL_error(L, "Option \"memory_limit\" is expected to be a non-negative number");
jbe@0 2094 }
jbe@0 2095 pool->memory_limit = n;
jbe@0 2096 }
jbe@0 2097 lua_settop(L, 2);
jbe@0 2098 lua_getfield(L, 2, "prepare");
jbe@0 2099 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
jbe@0 2100 luaL_error(L, "Option \"prepare\" must be nil or a function");
jbe@0 2101 }
jbe@0 2102 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
jbe@0 2103 lua_getfield(L, 2, "connect");
jbe@0 2104 if (!lua_isfunction(L, -1)) {
jbe@0 2105 luaL_error(L, "Option \"connect\" must be a function; use listen{{...}, {...}, connect=function(socket) ... end, ...}");
jbe@0 2106 }
jbe@0 2107 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
jbe@0 2108 lua_getfield(L, 2, "finish");
jbe@0 2109 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
jbe@0 2110 luaL_error(L, "Option \"finish\" must be nil or a function");
jbe@0 2111 }
jbe@0 2112 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
jbe@0 2113 return 0;
jbe@0 2114 }
jbe@0 2115
jbe@0 2116 static int moonbr_listen(lua_State *L) {
jbe@0 2117 struct moonbr_pool *pool;
jbe@0 2118 lua_Integer listener_count;
jbe@0 2119 if (moonbr_booted) luaL_error(L, "Moonbridge bootup is already complete");
jbe@0 2120 luaL_checktype(L, 1, LUA_TTABLE);
jbe@0 2121 listener_count = luaL_len(L, 1);
jbe@0 2122 if (!listener_count) luaL_error(L, "No listen ports specified; use listen{{proto=..., port=...},...}");
jbe@0 2123 if (listener_count > 100) luaL_error(L, "Too many listeners");
jbe@0 2124 pool = moonbr_create_pool(listener_count);
jbe@0 2125 lua_pushcfunction(L, moonbr_listen_init_pool);
jbe@0 2126 lua_pushlightuserdata(L, pool);
jbe@0 2127 lua_pushvalue(L, 1);
jbe@0 2128 if (lua_pcall(L, 2, 0, 0)) goto moonbr_listen_error;
jbe@0 2129 {
jbe@0 2130 int i;
jbe@0 2131 i = moonbr_start_pool(pool);
jbe@0 2132 if (i >= 0) {
jbe@125 2133 lua_pushfstring(L, "Could not initialize listener #%d: %s", i+1, strerror(errno));
jbe@125 2134 moonbr_listen_error:
jbe@125 2135 moonbr_destroy_pool(pool);
jbe@125 2136 lua_pushnil(L);
jbe@125 2137 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
jbe@125 2138 lua_pushnil(L);
jbe@125 2139 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
jbe@125 2140 lua_pushnil(L);
jbe@125 2141 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
jbe@125 2142 lua_error(L);
jbe@0 2143 }
jbe@0 2144 }
jbe@0 2145 return 0;
jbe@0 2146 }
jbe@0 2147
jbe@0 2148
jbe@9 2149 /*** Function to modify Lua's library path and/or cpath ***/
jbe@9 2150
jbe@9 2151 #if defined(MOONBR_LUA_PATH) || defined(MOONBR_LUA_CPATH)
jbe@9 2152 static void moonbr_modify_path(lua_State *L, char *key, char *value) {
jbe@9 2153 int stackbase;
jbe@9 2154 stackbase = lua_gettop(L);
jbe@9 2155 lua_getglobal(L, "package");
jbe@9 2156 lua_getfield(L, stackbase+1, key);
jbe@9 2157 {
jbe@9 2158 const char *current_str;
jbe@9 2159 size_t current_strlen;
jbe@9 2160 luaL_Buffer buf;
jbe@9 2161 current_str = lua_tolstring(L, stackbase+2, &current_strlen);
jbe@9 2162 luaL_buffinit(L, &buf);
jbe@9 2163 if (current_str) {
jbe@9 2164 lua_pushvalue(L, stackbase+2);
jbe@9 2165 luaL_addvalue(&buf);
jbe@9 2166 if (current_strlen && current_str[current_strlen-1] != ';') {
jbe@9 2167 luaL_addchar(&buf, ';');
jbe@9 2168 }
jbe@9 2169 }
jbe@9 2170 luaL_addstring(&buf, value);
jbe@9 2171 luaL_pushresult(&buf);
jbe@9 2172 }
jbe@9 2173 lua_setfield(L, stackbase+1, key);
jbe@9 2174 lua_settop(L, stackbase);
jbe@9 2175 }
jbe@9 2176 #endif
jbe@9 2177
jbe@9 2178
jbe@0 2179 /*** Main function and command line invokation ***/
jbe@0 2180
jbe@0 2181 static void moonbr_usage(int err, const char *cmd) {
jbe@0 2182 FILE *out;
jbe@0 2183 out = err ? stderr : stdout;
jbe@0 2184 if (!cmd) cmd = "moonbridge";
jbe@0 2185 fprintf(out, "Get this help message: %s {-h|--help}\n", cmd);
jbe@0 2186 fprintf(out, "Usage: %s \\\n", cmd);
jbe@0 2187 fprintf(out, " [-b|--background] \\\n");
jbe@0 2188 fprintf(out, " [-d|--debug] \\\n");
jbe@0 2189 fprintf(out, " [-f|--logfacility {DAEMON|USER|0|1|...|7}] \\\n");
jbe@0 2190 fprintf(out, " [-i|--logident <syslog ident> \\\n");
jbe@0 2191 fprintf(out, " [-l|--logfile <logfile>] \\\n");
jbe@0 2192 fprintf(out, " [-p|--pidfile <pidfile>] \\\n");
jbe@0 2193 fprintf(out, " [-s|--stats] \\\n");
jbe@2 2194 fprintf(out, " -- <Lua script> [<cmdline options for Lua script>]\n");
jbe@0 2195 exit(err);
jbe@0 2196 }
jbe@0 2197
jbe@0 2198 #define moonbr_usage_error() moonbr_usage(MOONBR_EXITCODE_CMDLINEERROR, argc ? argv[0] : NULL)
jbe@0 2199
jbe@0 2200 int main(int argc, char **argv) {
jbe@0 2201 {
jbe@0 2202 int daemonize = 0;
jbe@0 2203 int log_facility = LOG_USER;
jbe@0 2204 const char *log_ident = "moonbridge";
jbe@0 2205 const char *log_filename = NULL;
jbe@0 2206 const char *pid_filename = NULL;
jbe@0 2207 int option;
jbe@0 2208 struct option longopts[] = {
jbe@0 2209 { "background", no_argument, NULL, 'b' },
jbe@0 2210 { "debug", no_argument, NULL, 'd' },
jbe@0 2211 { "logfacility", required_argument, NULL, 'f' },
jbe@0 2212 { "help", no_argument, NULL, 'h' },
jbe@0 2213 { "logident", required_argument, NULL, 'i' },
jbe@0 2214 { "logfile", required_argument, NULL, 'l' },
jbe@0 2215 { "pidfile", required_argument, NULL, 'p' },
jbe@231 2216 { "stats", no_argument, NULL, 's' },
jbe@231 2217 { NULL, 0, NULL, 0 }
jbe@0 2218 };
jbe@0 2219 while ((option = getopt_long(argc, argv, "bdf:hi:l:p:s", longopts, NULL)) != -1) {
jbe@0 2220 switch (option) {
jbe@0 2221 case 'b':
jbe@0 2222 daemonize = 1;
jbe@0 2223 break;
jbe@0 2224 case 'd':
jbe@0 2225 moonbr_debug = 1;
jbe@0 2226 moonbr_stat = 1;
jbe@0 2227 break;
jbe@0 2228 case 'f':
jbe@0 2229 if (!strcmp(optarg, "DAEMON")) {
jbe@0 2230 log_facility = LOG_DAEMON;
jbe@0 2231 } else if (!strcmp(optarg, "USER")) {
jbe@0 2232 log_facility = LOG_USER;
jbe@0 2233 } else if (!strcmp(optarg, "0")) {
jbe@0 2234 log_facility = LOG_LOCAL0;
jbe@0 2235 } else if (!strcmp(optarg, "1")) {
jbe@0 2236 log_facility = LOG_LOCAL1;
jbe@0 2237 } else if (!strcmp(optarg, "2")) {
jbe@0 2238 log_facility = LOG_LOCAL2;
jbe@0 2239 } else if (!strcmp(optarg, "3")) {
jbe@0 2240 log_facility = LOG_LOCAL3;
jbe@0 2241 } else if (!strcmp(optarg, "4")) {
jbe@0 2242 log_facility = LOG_LOCAL4;
jbe@0 2243 } else if (!strcmp(optarg, "5")) {
jbe@0 2244 log_facility = LOG_LOCAL5;
jbe@0 2245 } else if (!strcmp(optarg, "6")) {
jbe@0 2246 log_facility = LOG_LOCAL6;
jbe@0 2247 } else if (!strcmp(optarg, "7")) {
jbe@0 2248 log_facility = LOG_LOCAL7;
jbe@0 2249 } else {
jbe@0 2250 moonbr_usage_error();
jbe@0 2251 }
jbe@0 2252 moonbr_use_syslog = 1;
jbe@0 2253 break;
jbe@0 2254 case 'h':
jbe@0 2255 moonbr_usage(MOONBR_EXITCODE_GRACEFUL, argv[0]);
jbe@0 2256 break;
jbe@0 2257 case 'i':
jbe@0 2258 log_ident = optarg;
jbe@0 2259 moonbr_use_syslog = 1;
jbe@0 2260 break;
jbe@0 2261 case 'l':
jbe@0 2262 log_filename = optarg;
jbe@0 2263 break;
jbe@0 2264 case 'p':
jbe@0 2265 pid_filename = optarg;
jbe@0 2266 break;
jbe@0 2267 case 's':
jbe@0 2268 moonbr_stat = 1;
jbe@0 2269 break;
jbe@0 2270 default:
jbe@0 2271 moonbr_usage_error();
jbe@0 2272 }
jbe@0 2273 }
jbe@2 2274 if (argc - optind < 1) moonbr_usage_error();
jbe@0 2275 if (pid_filename) {
jbe@0 2276 pid_t otherpid;
jbe@0 2277 while ((moonbr_pidfh = pidfile_open(pid_filename, 0644, &otherpid)) == NULL) {
jbe@0 2278 if (errno == EEXIST) {
jbe@0 2279 if (otherpid == -1) {
jbe@0 2280 fprintf(stderr, "PID file \"%s\" is already locked\n", pid_filename);
jbe@0 2281 } else {
jbe@0 2282 fprintf(stderr, "PID file \"%s\" is already locked by process with PID: %i\n", pid_filename, (int)otherpid);
jbe@0 2283 }
jbe@0 2284 exit(MOONBR_EXITCODE_ALREADYRUNNING);
jbe@0 2285 } else if (errno != EINTR) {
jbe@0 2286 fprintf(stderr, "Could not write PID file \"%s\": %s\n", pid_filename, strerror(errno));
jbe@0 2287 exit(MOONBR_EXITCODE_STARTUPERROR);
jbe@0 2288 }
jbe@0 2289 }
jbe@0 2290 }
jbe@0 2291 if (log_filename) {
jbe@0 2292 int logfd;
jbe@0 2293 while (
jbe@0 2294 ( logfd = flopen(
jbe@0 2295 log_filename,
jbe@0 2296 O_WRONLY|O_NONBLOCK|O_CREAT|O_APPEND|O_CLOEXEC,
jbe@0 2297 0640
jbe@0 2298 )
jbe@0 2299 ) < 0
jbe@0 2300 ) {
jbe@0 2301 if (errno == EWOULDBLOCK) {
jbe@0 2302 fprintf(stderr, "Logfile \"%s\" is locked\n", log_filename);
jbe@0 2303 exit(MOONBR_EXITCODE_ALREADYRUNNING);
jbe@0 2304 } else if (errno != EINTR) {
jbe@0 2305 fprintf(stderr, "Could not open logfile \"%s\": %s\n", log_filename, strerror(errno));
jbe@0 2306 exit(MOONBR_EXITCODE_STARTUPERROR);
jbe@0 2307 }
jbe@0 2308 }
jbe@0 2309 moonbr_logfile = fdopen(logfd, "a");
jbe@0 2310 if (!moonbr_logfile) {
jbe@0 2311 fprintf(stderr, "Could not open write stream to logfile \"%s\": %s\n", log_filename, strerror(errno));
jbe@0 2312 exit(MOONBR_EXITCODE_STARTUPERROR);
jbe@0 2313 }
jbe@0 2314 }
jbe@0 2315 if (daemonize == 0 && !moonbr_logfile) moonbr_logfile = stderr;
jbe@0 2316 if (moonbr_logfile) setlinebuf(moonbr_logfile);
jbe@0 2317 else moonbr_use_syslog = 1;
jbe@0 2318 if (moonbr_use_syslog) openlog(log_ident, LOG_NDELAY | LOG_PID, log_facility);
jbe@0 2319 if (daemonize) {
jbe@0 2320 if (daemon(1, 0)) {
jbe@0 2321 moonbr_log(LOG_ERR, "Could not daemonize moonbridge process");
jbe@0 2322 moonbr_terminate_error();
jbe@0 2323 }
jbe@0 2324 }
jbe@0 2325 }
jbe@0 2326 moonbr_log(LOG_NOTICE, "Starting moonbridge server");
jbe@0 2327 if (moonbr_pidfh && pidfile_write(moonbr_pidfh)) {
jbe@0 2328 moonbr_log(LOG_ERR, "Could not write pidfile (after locking)");
jbe@0 2329 }
jbe@0 2330 {
jbe@0 2331 lua_State *L;
jbe@0 2332 L = lua_newstate(moonbr_alloc, NULL);
jbe@0 2333 if (!L) {
jbe@0 2334 moonbr_log(LOG_CRIT, "Could not initialize Lua state");
jbe@0 2335 moonbr_terminate_error();
jbe@0 2336 }
jbe@0 2337 lua_atpanic(L, moonbr_lua_panic);
jbe@58 2338 lua_pushliteral(L, MOONBR_VERSION_STRING);
jbe@58 2339 lua_setglobal(L, "_MOONBRIDGE_VERSION");
jbe@0 2340 luaL_openlibs(L);
jbe@89 2341 luaL_requiref(L, "moonbridge_io", luaopen_moonbridge_io, 1);
jbe@89 2342 lua_pop(L, 1);
jbe@8 2343 #ifdef MOONBR_LUA_PATH
jbe@9 2344 moonbr_modify_path(L, "path", MOONBR_LUA_PATH);
jbe@9 2345 #endif
jbe@9 2346 #ifdef MOONBR_LUA_CPATH
jbe@9 2347 moonbr_modify_path(L, "cpath", MOONBR_LUA_CPATH);
jbe@8 2348 #endif
jbe@0 2349 lua_pushcfunction(L, moonbr_timeout);
jbe@0 2350 lua_setglobal(L, "timeout");
jbe@0 2351 lua_pushcfunction(L, moonbr_listen);
jbe@0 2352 lua_setglobal(L, "listen");
jbe@17 2353 lua_pushcfunction(L, moonbr_addtraceback); /* on stack position 1 */
jbe@2 2354 moonbr_log(LOG_INFO, "Loading \"%s\"", argv[optind]);
jbe@2 2355 if (luaL_loadfile(L, argv[optind])) {
jbe@2 2356 moonbr_log(LOG_ERR, "Error while loading \"%s\": %s", argv[optind], lua_tostring(L, -1));
jbe@2 2357 moonbr_terminate_error();
jbe@2 2358 }
jbe@2 2359 { int i; for (i=optind+1; i<argc; i++) lua_pushstring(L, argv[i]); }
jbe@2 2360 if (lua_pcall(L, argc-(optind+1), 0, 1)) {
jbe@2 2361 moonbr_log(LOG_ERR, "Error while executing \"%s\": %s", argv[optind], lua_tostring(L, -1));
jbe@2 2362 moonbr_terminate_error();
jbe@0 2363 }
jbe@6 2364 if (!moonbr_first_pool) {
jbe@6 2365 moonbr_log(LOG_WARNING, "No listener initialized.");
jbe@6 2366 moonbr_terminate_error();
jbe@6 2367 }
jbe@0 2368 lua_getglobal(L, "listen");
jbe@0 2369 lua_pushcfunction(L, moonbr_listen);
jbe@0 2370 if (lua_compare(L, -2, -1, LUA_OPEQ)) {
jbe@0 2371 lua_pushnil(L);
jbe@0 2372 lua_setglobal(L, "listen");
jbe@0 2373 }
jbe@0 2374 lua_settop(L, 1);
jbe@223 2375 lua_gc(L, LUA_GCCOLLECT, 0); /* collect garbage before forking later */
jbe@0 2376 moonbr_run(L);
jbe@0 2377 }
jbe@0 2378 return 0;
jbe@0 2379 }
jbe@0 2380

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