qpush.c

/*
 * libqueue - provides persistent, named data storage queues
 * Copyright (C) 2014-2016 Jens Oliver John <dev@2ion.de>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * */

#include <stdio.h>
#include <string.h>
#include <libgen.h>
#include <getopt.h>
#include "queue.h"
#include <signal.h>
#include "queueutils.h"

/* global so that we can close the database properly in case of an
 * interrupt while reading from stdin */
struct Queue *q;

static inline void push_buf(struct Queue *q,
		struct QueueData *d, char*linebuf, size_t*linebuflen) {
	d->v = linebuf;
	d->vlen = *linebuflen-(2*sizeof(char));//remove trailing newline
	if(queue_push(q, d) != LIBQUEUE_SUCCESS){
		fputs("Failed to push value onto the queue: ", stdout);
		puts(linebuf);
	}
	memset(linebuf, 0, *linebuflen);
}

void sighandler(int s) {
	puts("Cought SIGINT and SIGTERM while reading from stdin.\n"
			"I'll try to exit gracefully...");
	exit(EXIT_FAILURE);
}

void do_at_exit(void) {
	if(queue_close(q) != LIBQUEUE_SUCCESS)
		puts("Failed to close the queue");
}

int main(int argc, char **argv) {
	struct QueueData d;
	int i = 0;
	char *cq = NULL;
	int opt = 0;
	int use_stdin = 0;
	int use_null = 0;
	char *linebuf = NULL;
	size_t linebuflen = 0;

	while((opt = getopt(argc, argv, "0rhq:")) != -1)
		switch(opt) {
			case 'q':
				cq = strdup(optarg);
				break;
			case 'r':
				use_stdin = 1;
				break;
			case '0':
				use_null = 1;
				break;
			default:
			case 'h':
				puts("Usage: qpush [-h] [-q queue-name] [--] <args>");
				return EXIT_FAILURE;
		}

	i = optind-1;
	q = queue_open(SELECTQUEUE(cq));
	if(0 == queue_is_opened(q)) {
		fprintf(stderr,"Failed to open the queue:%s\n", queue_get_last_error(q));
		if (LIBQUEUE_FAILURE == queue_close(q)) {
			fprintf(stderr,"Failed to close queue:%s\n", queue_get_last_error(q));
		}
		return EXIT_FAILURE;
	}

	atexit(do_at_exit);
	signal(SIGINT, sighandler);
	signal(SIGTERM, sighandler);

	switch(use_stdin) {
		default:
		case 0:
			while(argv[++i]) {
				d.v = argv[i];
				d.vlen = sizeof(char)*(strlen(argv[i])+1);
				if(queue_push(q, &d) != LIBQUEUE_SUCCESS) {
					fputs("Failed to push value onto the queue: ", stdout);
					puts(argv[i]);
				}
			}
			break;
		case 1:
			linebuf = calloc(256, sizeof(char));
			linebuflen = 256*sizeof(char);
			switch(use_null) {
				default:
				case 0:
					while(getline(&linebuf, &linebuflen, stdin) != -1)
						push_buf(q, &d, linebuf, &linebuflen);
					break; // case 0:use_null
				case 1:
					while(getdelim(&linebuf, &linebuflen, '\0', stdin) != -1)
						push_buf(q, &d, linebuf, &linebuflen);
					break;
			}
			break; // case 1:use_stdin
			free(linebuf);
	}
	if(cq != NULL)
		free(cq);
	return 0;
}