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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <json-c/json.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include "reporting.h"
power_statistics * init_power_statistics(int relay_num) {
power_statistics *stats = malloc(sizeof(power_statistics));
stats->relay_num = relay_num;
stats->engaged = calloc(strlen("false") + 1, sizeof(char));
return stats;
}
void free_power_statistics(power_statistics *stats) {
free(stats->engaged);
free(stats);
}
bool power_statistics_is_engaged(power_statistics *stats) {
return strcmp(stats->engaged, "on") == 0;
}
int power_statistics_load_from_file(power_statistics *stats) {
FILE *fp;
char filename[12];
snprintf(filename, 12, "/dev/power%d", stats->relay_num);
fp = fopen(filename, "r");
if (!fp) {
return 1;
}
if (fscanf(fp, "%s %f\n %f\n %f\n %f\n %f\n",
stats->engaged,
&stats->active_power,
&stats->energy_sum,
&stats->current_rms,
&stats->voltage_rms,
&stats->power_factor) != 6) {
fclose(fp);
return 1;
}
fclose(fp);
return 0;
}
int get_output_count() {
return access("/dev/power8", F_OK) != -1 ? 8 : 3;
}
int get_stats_all_outputs(power_statistics ***out_stats) {
int i;
int output_count;
power_statistics *stat;
power_statistics **stats;
output_count = get_output_count();
stats = malloc(sizeof(power_statistics *) * (output_count + 1));
for (i = output_count; i > 0; i--) {
stat = init_power_statistics(i);
if (power_statistics_load_from_file(stat)) {
continue;
}
stats[i] = stat;
}
*out_stats = stats;
return output_count;
}
json_object * format_power_satistics_output_json(power_statistics *stats) {
json_object *top_object;
top_object = json_object_new_object();
json_object_object_add(top_object, "output", json_object_new_int(stats->relay_num));
json_object_object_add(top_object, "engaged", json_object_new_boolean(power_statistics_is_engaged(stats)));
json_object_object_add(top_object, "active_power", json_object_new_double(stats->active_power));
json_object_object_add(top_object, "energy_sum", json_object_new_double(stats->energy_sum));
json_object_object_add(top_object, "current_rms", json_object_new_double(stats->current_rms));
json_object_object_add(top_object, "voltage_rms", json_object_new_double(stats->voltage_rms));
json_object_object_add(top_object, "power_factor", json_object_new_double(stats->power_factor));
return top_object;
}
char * format_report_all_outputs(power_statistics **stats, int report_count) {
int i;
char *output;
char hostname[256];
char ip_address[15];
const char *tmp;
json_object *top_object, *report_array;
memset(hostname, 0, sizeof(hostname));
gethostname(hostname, 255);
memset(ip_address, 0, sizeof(ip_address));
get_primary_ip_address(ip_address);
report_array = json_object_new_array();
top_object = json_object_new_object();
json_object_object_add(top_object, "hostname", json_object_new_string(hostname));
json_object_object_add(top_object, "ip_address", json_object_new_string(ip_address));
json_object_object_add(top_object, "reports", report_array);
for (i = report_count; i > 0; i--) {
json_object_array_add(report_array, format_power_satistics_output_json(stats[i]));
free_power_statistics(stats[i]);
}
tmp = json_object_to_json_string_ext(top_object, JSON_C_TO_STRING_PLAIN);
output = strdup(tmp);
json_object_put(top_object);
return output;
}
void get_primary_ip_address(char ip_address[15])
{
int fd;
struct ifreq ifr;
fd = socket(AF_INET, SOCK_DGRAM, 0);
memcpy(ifr.ifr_name, "ath0", IFNAMSIZ-1);
ioctl(fd, SIOCGIFADDR, &ifr);
close(fd);
strncpy(ip_address, inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr), 15);
}
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