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// The MIT License (MIT)
// Copyright (c) 2017 Yun-Chih Chen
// Copyright (c) 2013 Florian Richter (nflogtable)
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "collect.h"
#include "commit.h"
#include "common.h"
#include <dirent.h>
#include <fcntl.h>
#include <getopt.h>
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
const char *help_text =
"Usage: " PACKAGE " [OPTION]\n"
"\n"
"Options:\n"
" -c --compression=<algo> compression algorithm to use (default: no "
"compression)\n"
" -d --storage_dir=<dirname> log files storage directory\n"
" -h --help print this help\n"
" -g --nflog-group=<id> the group id to collect\n"
" -p --parallelism=<num> max number of committer thread\n"
" -t --truncate whether or not to truncate existing trunks"
" (default: no)\n"
" -s --storage_size=<dirsize> log files maximum total size in MiB\n"
" -v --version print version information\n"
"\n";
static uint32_t calculate_starting_trunk(const char *storage_dir);
static nfl_nl_t netlink_fd;
static void sig_handler(int signo) {
if (signo == SIGHUP) {
puts("Terminated due to SIGHUP ...");
nfl_close_netlink_fd(&netlink_fd);
}
}
int main(int argc, char *argv[]) {
uint32_t max_commit_worker = 0, storage_size = 0;
uint32_t trunk_cnt = 0, trunk_size = 0;
uint32_t entries_max, cur_trunk;
bool truncate_trunks = false;
nfl_global_t g;
int nfl_group_id = -1;
char *compression_flag = NULL, *storage_dir = NULL;
struct option longopts[] = {/* name, has_args, flag, val */
{"nflog-group", required_argument, NULL, 'g'},
{"storage_dir", required_argument, NULL, 'd'},
{"storage_size", required_argument, NULL, 's'},
{"compression", optional_argument, NULL, 'z'},
{"parallelism", optional_argument, NULL, 'p'},
{"truncate", no_argument, NULL, 't'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'v'},
{0, 0, 0, 0}};
int opt;
while ((opt = getopt_long(argc, argv, "c:g:d:s:hvp:", longopts, NULL)) !=
-1) {
switch (opt) {
case 'h':
printf("%s", help_text);
exit(0);
break;
case 'v':
printf("%s %s", PACKAGE, VERSION);
exit(0);
break;
case 't':
truncate_trunks = true;
break;
case 'c':
compression_flag = optarg;
break;
case 'd':
storage_dir = optarg;
break;
case 'g':
nfl_group_id = atoi(optarg);
break;
case 'p':
max_commit_worker = atoi(optarg);
break;
case 's':
storage_size = atoi(optarg);
break;
case '?':
fprintf(stderr, "Unknown argument, see --help\n");
exit(1);
}
}
// verify arguments
ASSERT(nfl_group_id != -1,
"You must provide a nflog group (see --help)!\n");
ASSERT(storage_dir != NULL,
"You must provide a storage directory (see --help)\n");
ASSERT(storage_size != 0, "You must provide the desired size of log file "
"(in MiB) (see --help)\n");
ERR(nfl_check_dir(storage_dir) < 0, "storage directory not exist");
// max number of commit worker defaults to #processor - 1
if (max_commit_worker == 0) {
max_commit_worker = sysconf(_SC_NPROCESSORS_ONLN) - 1;
max_commit_worker = max_commit_worker > 0 ? max_commit_worker : 1;
}
g.storage_dir = storage_dir;
// register signal handler
ERR(signal(SIGHUP, sig_handler) == SIG_ERR, "Could not set SIGHUP handler");
nfl_cal_trunk(storage_size, &trunk_cnt, &trunk_size);
nfl_cal_entries(trunk_size, &entries_max);
nfl_setup_compression(compression_flag, &g.compression_opt);
// Set up commit worker
g.nfl_commit_queue = malloc(sizeof(sem_t));
sem_init(g.nfl_commit_queue, 0, max_commit_worker);
// Set up nflog receiver worker
nfl_state_t **trunks = (nfl_state_t **)calloc(trunk_cnt, sizeof(void *));
info(PACKAGE ": storing in directory '%s', capped by %d MiB", storage_dir,
storage_size);
info(PACKAGE ": workers started, entries per trunk = %d, #trunks = %d",
entries_max, trunk_cnt);
if (truncate_trunks) {
cur_trunk = 0;
info(PACKAGE ": requested to truncate (overwrite) trunks in %s",
storage_dir);
} else {
int calculated_trunk = calculate_starting_trunk(storage_dir);
cur_trunk = calculated_trunk < 0 ? 0: NEXT(calculated_trunk, trunk_cnt);
const char *fn = nfl_get_filename(storage_dir, cur_trunk);
info(PACKAGE ": will start writing to trunk %s and onward", fn);
free((char *)fn);
}
nfl_open_netlink_fd(&netlink_fd, nfl_group_id);
for (;; cur_trunk = NEXT(cur_trunk, trunk_cnt)) {
debug("Running receiver worker: id = %d", cur_trunk);
nfl_state_init(&(trunks[cur_trunk]), cur_trunk, entries_max, &g);
trunks[cur_trunk]->netlink_fd = &netlink_fd;
pthread_create(&(trunks[cur_trunk]->thread), NULL, nfl_collect_worker,
(void *)trunks[cur_trunk]);
// wait for current receiver worker
pthread_join(trunks[cur_trunk]->thread, NULL);
}
// Won't reach here
// We don't actually free trunks or the semaphore at all
sem_destroy(g.nfl_commit_queue);
nfl_close_netlink_fd(&netlink_fd);
exit(0);
}
/*
* Need to find a trunk to start with after a restart
* We choose the one with newest modification time.
* If no existing trunk is found, returns -1
*/
static uint32_t calculate_starting_trunk(const char *storage_dir) {
DIR *dp;
struct stat stat;
struct dirent *ep;
time_t newest = (time_t)0;
uint32_t newest_index = -1;
int index;
char cwd[100];
ERR(!(dp = opendir(storage_dir)), "Can't open the storage directory");
ERR(!getcwd(cwd, sizeof(cwd)), "getcwd");
ERR(chdir(storage_dir) < 0, "chdir");
while ((ep = readdir(dp))) {
const char *fn = ep->d_name;
index = nfl_storage_match_index(fn);
if (index >= 0 && index < MAX_TRUNK_ID) {
ERR(lstat(fn, &stat) < 0, fn);
if (difftime(stat.st_mtime, newest) > 0) {
newest = stat.st_mtime;
newest_index = (uint32_t)index;
}
}
}
closedir(dp);
ERR(chdir(cwd) < 0, "chdir");
return newest_index;
}
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