TCP data sending from pyton to logstash fails

(Raj Rajeshwar Singh Rathore) #1

I am trying to send data from python script over TCP and receive the same in the logstash.
But there is no exchange of data happening.


input {
  tcp {
      port => 5959
      codec => json


output {
    stdout {codec => rubydebug}

python :

import socket
import json
import sys

HOST = ""
PORT = 5959

print "#STARTED#"

  sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  print "socket created. sock: " + str(sock)
except socket.error, msg:
    print "error"
    sys.stderr.write("[ERROR] %s\n" % msg[1])

  sock.connect((HOST, PORT))
  print "socket connected to HOST: "+HOST+" PORT: "+str(PORT)
  print "socket connected. sock: " + str(sock)
except socket.error, msg:
    print "error"
    sys.stderr.write("[ERROR] %s\n" % msg[1])

msg = {'@message': 'python test message', '@tags': ['python', 'test']}
print "sending message: " + str(msg)

print "end"

After executing both the srcipts I am neither getting any error nor data in the logstash so can someone help like what can be causing the issue.

Logstash Not Receiving TCP Data
(Christian Dahlqvist) #2

I believe you need to send a new line after the JSON dump. Can you try adding one to see if that makes a difference?

(Raj Rajeshwar Singh Rathore) #3

Yeah, that worked. I just added sock.send('\n') after sock.sendall(json.dumps(msg)).
Can you explain why this new line is needed?

(Christian Dahlqvist) #4

Given that the json_lines codec exists, it is reasonable to expect the json codec should be able to handle this scenario. It seems like there is an open issue around this.

(Raj Rajeshwar Singh Rathore) #5

Thanks for the quick reply and explanation.

(system) #6

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