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/*************************************************************************//**
*
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <math.h>
#include "evel.h"
#define BUFSIZE 128
#define READ_INTERVAL 10
typedef struct dummy_vpp_metrics_struct {
int bytes_in;
int bytes_out;
int packets_in;
int packets_out;
} vpp_metrics_struct;
void read_vpp_metrics(vpp_metrics_struct *, char *);
int main(int argc, char** argv)
{
EVEL_ERR_CODES evel_rc = EVEL_SUCCESS;
EVENT_MEASUREMENT* vpp_m = NULL;
EVENT_HEADER* vpp_m_header = NULL;
int bytes_in_this_round;
int bytes_out_this_round;
int packets_in_this_round;
int packets_out_this_round;
vpp_metrics_struct* last_vpp_metrics = malloc(sizeof(vpp_metrics_struct));
vpp_metrics_struct* curr_vpp_metrics = malloc(sizeof(vpp_metrics_struct));
struct timeval time_val;
time_t start_epoch;
time_t last_epoch;
char hostname[BUFSIZE];
char* fqdn = argv[1];
int port = atoi(argv[2]);
char* vnic = argv[3];
printf("\nVector Packet Processing (VPP) measurement collection\n");
fflush(stdout);
if (argc != 4)
{
fprintf(stderr, "Usage: %s <FQDN>|<IP address> <port> <interface>\n", argv[0]);
exit(-1);
}
/**************************************************************************/
/* Initialize */
/**************************************************************************/
if(evel_initialize(fqdn, /* FQDN */
port, /* Port */
NULL, /* optional path */
NULL, /* optional topic */
0, /* HTTPS? */
"", /* Username */
"", /* Password */
EVEL_SOURCE_VIRTUAL_MACHINE, /* Source type */
"vLoadBalancer", /* Role */
1)) /* Verbosity */
{
fprintf(stderr, "\nFailed to initialize the EVEL library!!!\n");
exit(-1);
}
else
{
printf("\nInitialization completed\n");
}
gethostname(hostname, BUFSIZE);
memset(last_vpp_metrics, 0, sizeof(vpp_metrics_struct));
read_vpp_metrics(last_vpp_metrics, vnic);
gettimeofday(&time_val, NULL);
start_epoch = time_val.tv_sec * 1000000 + time_val.tv_usec;
sleep(READ_INTERVAL);
/***************************************************************************/
/* Collect metrics from the VNIC */
/***************************************************************************/
while(1) {
// Read the number of vDNSs currently active
int active_dns = 0;
FILE* fd = fopen("active_dns.txt", "r");
while(!feof(fd)) {
if(fscanf(fd, "%d", &active_dns) != 1) /* Avoid infinite loops if the file doesn't contain exactly one number */
break;
}
if(fclose(fd)) {
printf("Error when closing file\n");
return 1;
}
memset(curr_vpp_metrics, 0, sizeof(vpp_metrics_struct));
read_vpp_metrics(curr_vpp_metrics, vnic);
if(active_dns > 0 && (curr_vpp_metrics->bytes_in - last_vpp_metrics->bytes_in > 0)) {
bytes_in_this_round = (int) round((curr_vpp_metrics->bytes_in - last_vpp_metrics->bytes_in) / active_dns);
}
else {
bytes_in_this_round = 0;
}
if(active_dns > 0 && (curr_vpp_metrics->bytes_out - last_vpp_metrics->bytes_out > 0)) {
bytes_out_this_round = (int) round((curr_vpp_metrics->bytes_out - last_vpp_metrics->bytes_out) / active_dns);
}
else {
bytes_out_this_round = 0;
}
if(active_dns > 0 && (curr_vpp_metrics->packets_in - last_vpp_metrics->packets_in > 0)) {
packets_in_this_round = (int) round((curr_vpp_metrics->packets_in - last_vpp_metrics->packets_in) / active_dns);
}
else {
packets_in_this_round = 0;
}
if(active_dns > 0 && (curr_vpp_metrics->packets_out - last_vpp_metrics->packets_out > 0)) {
packets_out_this_round = (int) round((curr_vpp_metrics->packets_out - last_vpp_metrics->packets_out) / active_dns);
}
else {
packets_out_this_round = 0;
}
vpp_m = evel_new_measurement(READ_INTERVAL);
if(vpp_m != NULL) {
printf("New measurement report created...\n");
evel_measurement_vnic_use_add(vpp_m, /* Pointer to the measurement */
vnic, /* ASCII string with the vNIC's ID */
packets_in_this_round, /* Packets received */
packets_out_this_round, /* Packets transmitted */
0, /* Broadcast packets received */
0, /* Broadcast packets transmitted */
bytes_in_this_round, /* Total bytes received */
bytes_out_this_round, /* Total bytes transmitted */
0, /* Multicast packets received */
0, /* Multicast packets transmitted */
0, /* Unicast packets received */
0); /* Unicast packets transmitted */
/***************************************************************************/
/* Set parameters in the MEASUREMENT header packet */
/***************************************************************************/
last_epoch = start_epoch + READ_INTERVAL * 1000000;
vpp_m_header = (EVENT_HEADER *)vpp_m;
vpp_m_header->start_epoch_microsec = start_epoch;
vpp_m_header->last_epoch_microsec = last_epoch;
strcpy(vpp_m_header->reporting_entity_id.value, "No UUID available");
strcpy(vpp_m_header->reporting_entity_name, hostname);
evel_rc = evel_post_event(vpp_m_header);
if(evel_rc == EVEL_SUCCESS) {
printf("Measurement report correctly sent to the collector!\n");
}
else {
printf("Post failed %d (%s)\n", evel_rc, evel_error_string());
}
}
else {
printf("New measurement report failed (%s)\n", evel_error_string());
}
last_vpp_metrics->bytes_in = curr_vpp_metrics->bytes_in;
last_vpp_metrics->bytes_out = curr_vpp_metrics->bytes_out;
last_vpp_metrics->packets_in = curr_vpp_metrics->packets_in;
last_vpp_metrics->packets_out = curr_vpp_metrics->packets_out;
gettimeofday(&time_val, NULL);
start_epoch = time_val.tv_sec * 1000000 + time_val.tv_usec;
sleep(READ_INTERVAL);
}
/***************************************************************************/
/* Terminate */
/***************************************************************************/
sleep(1);
free(last_vpp_metrics);
free(curr_vpp_metrics);
evel_terminate();
printf("Terminated\n");
return 0;
}
void read_vpp_metrics(vpp_metrics_struct *vpp_metrics, char *vnic) {
// Define an array of char that contains the parameters of the unix 'cut' command
char* params[] = {"-f3", "-f11", "-f4", "-f12"};
// Define the unix command to execute in order to read metrics from the vNIC
char* cmd_prefix = "sudo cat /proc/net/dev | grep \"";
char* cmd_mid = "\" | tr -s \' \' | cut -d\' \' ";
char cmd[BUFSIZE];
// Define other variables
char buf[BUFSIZE]; /* buffer used to store VPP metrics */
int temp[] = {0, 0, 0, 0}; /* temp array that contains VPP values */
FILE *fp; /* file descriptor to pipe cmd to shell */
int i;
for(i = 0; i < 4; i++) {
// Clear buffers
memset(buf, 0, BUFSIZE);
memset(cmd, 0, BUFSIZE);
// Build shell command to read metrics from the vNIC
strcat(cmd, cmd_prefix);
strcat(cmd, vnic);
strcat(cmd, cmd_mid);
strcat(cmd, params[i]);
// Open a pipe and read VPP values
if ((fp = popen(cmd, "r")) == NULL) {
printf("Error opening pipe!\n");
return;
}
while (fgets(buf, BUFSIZE, fp) != NULL);
temp[i] = atoi(buf);
if(pclose(fp)) {
printf("Command not found or exited with error status\n");
return;
}
}
// Store metrics read from the vNIC in the struct passed from the main function
vpp_metrics->bytes_in = temp[0];
vpp_metrics->bytes_out = temp[1];
vpp_metrics->packets_in = temp[2];
vpp_metrics->packets_out = temp[3];
}
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