mirror of https://gerrit.osmocom.org/osmo-sysmon
161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
/* Simple Osmocom System Monitor (osysmon): Support for monitoring files */
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/* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <string.h>
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#include <sys/sysinfo.h>
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#include <osmocom/vty/vty.h>
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#include <osmocom/vty/command.h>
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#include "osysmon.h"
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#include "value_node.h"
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/***********************************************************************
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* Data model
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***********************************************************************/
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struct osysmon_file {
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struct llist_head list;
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struct {
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const char *name;
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const char *path;
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} cfg;
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};
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static struct osysmon_file *osysmon_file_find(const char *name)
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{
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struct osysmon_file *of;
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llist_for_each_entry(of, &g_oss->files, list) {
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if (!strcmp(of->cfg.name, name))
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return of;
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}
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return NULL;
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}
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static struct osysmon_file *osysmon_file_add(const char *name, const char *path)
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{
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struct osysmon_file *of;
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if (osysmon_file_find(name))
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return NULL;
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of = talloc_zero(g_oss, struct osysmon_file);
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OSMO_ASSERT(of);
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of->cfg.name = talloc_strdup(of, name);
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of->cfg.path = talloc_strdup(of, path);
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llist_add_tail(&of->list, &g_oss->files);
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return of;
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}
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static void osysmon_file_destroy(struct osysmon_file *of)
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{
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llist_del(&of->list);
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talloc_free(of);
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}
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static void osysmon_file_read(struct osysmon_file *of, struct value_node *parent)
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{
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char buf[512];
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char *s, *nl;
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FILE *f;
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f = fopen(of->cfg.path, "r");
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if (!f) {
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value_node_add(parent, of->cfg.name, "<NOTFOUND>");
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return;
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}
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s = fgets(buf, sizeof(buf), f);
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fclose(f);
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if (s == NULL) {
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value_node_add(parent, of->cfg.name, "<EMPTY>");
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return;
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}
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buf[sizeof(buf)-1] = '\0';
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while ((nl = strrchr(buf, '\n')))
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*nl = '\0';
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value_node_add(parent, of->cfg.name, buf);
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}
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/***********************************************************************
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* VTY
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***********************************************************************/
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#define FILE_STR "Configure a file to be monitored/watched\n"
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DEFUN(cfg_file, cfg_file_cmd,
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"file NAME PATH",
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FILE_STR "Name of this file-watcher\n" "Path of file in filesystem\n")
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{
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struct osysmon_file *of;
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of = osysmon_file_add(argv[0], argv[1]);
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if (!of) {
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vty_out(vty, "Couldn't add file-watcher, maybe it exists?%s", VTY_NEWLINE);
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return CMD_WARNING;
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}
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return CMD_SUCCESS;
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}
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DEFUN(cfg_no_file, cfg_no_file_cmd,
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"no file NAME",
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NO_STR FILE_STR "Name of this file-watcher\n")
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{
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struct osysmon_file *of;
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of = osysmon_file_find(argv[0]);
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if (!of) {
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vty_out(vty, "Cannot find file-watcher for '%s'%s", argv[0], VTY_NEWLINE);
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return CMD_WARNING;
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}
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osysmon_file_destroy(of);
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return CMD_SUCCESS;
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}
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static void osysmon_file_vty_init(void)
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{
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install_element(CONFIG_NODE, &cfg_file_cmd);
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install_element(CONFIG_NODE, &cfg_no_file_cmd);
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}
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/***********************************************************************
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* Runtime Code
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***********************************************************************/
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/* called once on startup before config file parsing */
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int osysmon_file_init()
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{
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osysmon_file_vty_init();
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return 0;
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}
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/* called periodically */
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int osysmon_file_poll(struct value_node *parent)
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{
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struct value_node *vn_file;
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struct osysmon_file *of;
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if (llist_empty(&g_oss->files))
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return 0;
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vn_file = value_node_add(parent, "file", NULL);
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llist_for_each_entry(of, &g_oss->files, list)
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osysmon_file_read(of, vn_file);
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return 0;
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}
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