def parse(filename):
"""Parses the given file line by line
while following it"""
try:
fd = open(filename)
except IOError:
print "Could not read file:", filename
lines = follow(fd)
for line in lines:
parsed = parse_line(line)
if parsed == None:
continue
yield parsed
def parse(filename):
"""Parses the given file line by line
while following it"""
try:
fd = open(filename)
except IOError:
print "Could not read file:", filename
lines = follow(fd)
for line in lines:
parsed = parse_line(line)
if parsed == None:
continue
yield parsed
from tail import follow
lines = follow(open('www/access-log'))
for i, line in enumerate(lines):
print(i, 'line: ', line, end='')
if i == 4:
lines.close()
import time
import threading
from tail import follow
shutdown = threading.Event()
lines = follow(open('www/access-log'), shutdown)
def sleep_and_close(s):
time.sleep(s)
print('Closing it down')
shutdown.set()
threading.Thread(target=sleep_and_close, args=(10, )).start()
for line in lines:
print(line, end='')
print(item)
yield item
class storelast:
def __init__(self, source):
self.source = source
def __next__(self):
item = self.source.__next__()
self.last = item
return item
def __iter__(self):
return self
if __name__ == '__main__':
gen_sqrt = generate(math.sqrt)
for x in trace(gen_sqrt(range(10))):
pass
print('--------------------')
lines = storelast(follow(open('www/access-log')))
log = apache_log(lines)
for r in log:
print(r)
print(lines.last)
# One of the most pwerful applications of generators is
# setting up processing pipelines.
# input sequence -> generator -> generator -> for x in a
import tail
def grep(pattern, lines):
for line in lines:
if pattern in lines:
yield line
logfile = open("access-log")
loglines = tail.follow(logfile)
pylines = grep("python", loglines)
for line in pylines:
print(line)
def feed_queue(log_q):
lines = open('www/access-log')
lines = follow(lines)
log = apache_log(lines)
sendto_queue(log, log_q)
from tail import follow
from parser import apache_log
from sendto import sendto
lines = open('www/access-log')
lines = follow(lines)
log = apache_log(lines)
sendto(log, ("", 15000))
#!/usr/bin/python
# when a new query appears into log file, blink the little green led (#25)
import RPi.GPIO as GPIO
import os
import time
import tail
# Some varaibles
logFile = "/opt/neo4j/logs/query.log"
blinkTime = 0.1
# Set GPIO mode that match the board number
GPIO.setmode(GPIO.BCM)
# Setup to on the little red led
GPIO.setup(25, GPIO.OUT, initial=GPIO.LOW)
# What we do when a new query appers ?
try:
for data in tail.follow(logFile):
GPIO.output(25, GPIO.HIGH)
time.sleep(0.1)
GPIO.output(25,GPIO.LOW)
except KeyboardInterrupt:
GPIO.cleanup()
exit(0)