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#!@PYTHON@
""" Remote log reader for Pacemaker's Cluster Test Suite (CTS)
Reads a specified number of lines from the supplied offset
Returns the current offset
Contains logic for handling truncation
"""
__copyright__ = "Copyright 2014-2020 the Pacemaker project contributors"
__license__ = "GNU General Public License version 2 or later (GPLv2+) WITHOUT ANY WARRANTY"
import sys
import os
import fcntl
if __name__ == '__main__':
limit = 0
offset = 0
prefix = ''
filename = '/var/log/messages'
skipthis=None
args=sys.argv[1:]
for i in range(0, len(args)):
if skipthis:
skipthis=None
continue
elif args[i] == '-l' or args[i] == '--limit':
skipthis=1
limit = int(args[i+1])
elif args[i] == '-f' or args[i] == '--filename':
skipthis=1
filename = args[i+1]
elif args[i] == '-o' or args[i] == '--offset':
skipthis=1
offset = args[i+1]
elif args[i] == '-p' or args[i] == '--prefix':
skipthis=1
prefix = args[i+1]
if not os.access(filename, os.R_OK):
print(prefix + 'Last read: %d, limit=%d, count=%d - unreadable' % (0, limit, 0))
sys.exit(1)
logfile=open(filename, 'r')
logfile.seek(0, os.SEEK_END)
newsize=logfile.tell()
if offset != 'EOF':
offset = int(offset)
if newsize >= offset:
logfile.seek(offset)
else:
print(prefix + ('File truncated from %d to %d' % (offset, newsize)))
if (newsize*1.05) < offset:
logfile.seek(0)
# else: we probably just lost a few logs after a fencing op
# continue from the new end
# TODO: accept a timestamp and discard all messages older than it
# Don't block when we reach EOF
fcntl.fcntl(logfile.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
count = 0
while True:
if logfile.tell() >= newsize: break
elif limit and count >= limit: break
line = logfile.readline()
if not line: break
print(line.strip())
count += 1
print(prefix + 'Last read: %d, limit=%d, count=%d' % (logfile.tell(), limit, count))
logfile.close()
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