Not sure if anyone is using "latency measurement" feature in Kamailio
dispatcher module, I thought I could share a very simple Python script that
I am using to monitor remote gateway using this.
Sample Script is attached, it will post data to statsd and is working in
cron
The feature can be enabled :
3.27. ds_ping_latency_stats (int)
Enable latency measurement when pinging nodes
If set to 0, disable latency measurement.
If set to 1, enable latency measurement
https://www.kamailio.org/docs/modules/devel/modules/dispatcher.html#dispatcher.p.ds_ping_latency_stats
This is one use case of this feature, another one will be to load balance
based on congestion detected on latency, I am planning to share a lab
experiment in a little while.
Regards
#!/usr/bin/python
import subprocess
from time import sleep
import time
# URI: sip:10.10.1.1:5060
#0 FLAGS: AP
#1 PRIORITY: 12
#2 LATENCY: {
#3 AVG: 30.529000
#4 STD: 4.849000
#5 EST: 30.999000
#6 MAX: 1270
#7 TIMEOUT: 0
def server_stats(ip):
idx = -1
for line in dlist.splitlines():
if idx == 5:
est_latency = line.strip()
if idx == 7:
timeout = line.strip()
if idx >= 0:
idx = idx + 1
if line.find("URI: sip:{}".format(ip)) > 0:
idx = 0
if timeout[:9] == "TIMEOUT: ":
timeout_count = timeout[9:]
cmd = "echo \"fastlink.timeout.{}:{}|g\" | nc -w 1 -u 127.0.0.1 8125".format(ip, timeout_count)
subprocess.call(cmd, shell=True)
print(cmd)
if est_latency[:5] == "EST: ":
latency = est_latency[5:]
cmd = "echo \"fastlink.latency.{}:{}|g\" | nc -w 1 -u 127.0.0.1 8125".format(ip, latency)
subprocess.call(cmd, shell=True)
print("est latency:{}".format(latency))
servers = ["10.40.5.175", "10.40.2.233", "10.40.1.103"]
interval = 10
it = 0
while it < 6:
# while 1:
ts = time.time()
print("[{}]now:{}".format(it,ts))
next_ts = ts + 10
it = it + 1
dlist = subprocess.check_output(["/usr/bin/docker","exec","kamailio","kamcmd","dispatcher.list"])
for ip in servers:
print(ip)
server_stats(ip)
ts = time.time()
print("sleeping:{}".format(next_ts - ts))
wait_ts = next_ts - ts;
if wait_ts < 0:
wait_ts = 7
sleep(wait_ts)
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