Python sys.stdin.read () from tail -f

Question

How did sys.stdin.read () not read the input stream from the -f tail?

#!/usr/bin/env python
import sys
from geoip import geolite2
def iplookup(srcip):
        for ip in srcip.split("\n"):
                try:
                        print(geolite2.lookup(ip))
                except:
                        pass
source = sys.stdin.read()
iplookup(source)

tail -f /var/log/bleh.log | grep -oE '((1?[0-9][0-9]?|2[0-4][0-9]|25[0-5])\.){3}(1?[0-9][0-9]?|2[0-4][0-9]|25[0-5])' | python mygeoip.py

Answer 1

You can use sys.stdiniterator rather than try to read it first.

def iplookup(srcip):
    for ip in srcip:
        ip = ip.strip()
        try:
            print(geolite2.lookup(ip))
        except:
            pass

iplookup(sys.stdin)

Answer 2

You can use fileinput:

import sys
from geoip import geolite2
import fileinput

def iplookup(srcip):
        for ip in srcip.split("\n"):
                try:
                        print(geolite2.lookup(ip))
                except:
                        pass

for line in fileinput.input():
    iplookup(line)

On the plus side, your script automatically accepts the file name as parameters.

Answer 3

( fileinput) tail -f.

python:

, xreadlines(), readlines() ( " sys.stdin" ), . , "sys.stdin.readline()" "1:".

, :

while True:
    line = sys.stdin.readline()
    iplookup(line)

Answer 4

read () is read before reaching EOF. The EOF char is added when the close () function is executed, or you can add it explicitly.

There is no EOF in your file. Modify your program to read fixed-size blocks or iterate over leadline ().