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########################################################################
# $Header: /var/local/cvsroot/4Suite/Ft/Server/Server/Commands/Log/View.py,v 1.7 2004/02/01 03:09:25 jkloth Exp $
"""
4ss_manager log view command
Copyright 2003 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
__doc__ = """View the logs"""
def Run(options, args):
import time, sys, os
from Ft.Server.Server.Commands.CommandUtil import GetRepository
bytes = None
if options.has_key('bytes'):
bytes = int(options['bytes'])
lines = None
if options.has_key('lines'):
lines = int(options['lines'])
if bytes is None and lines is None:
# default is 10 lines
lines = 10
interval = float(options.get('sleep-interval', 1.0))
username, password, properties, repo = \
GetRepository(options, '4ss_manager.log.view')
repo.txRollback()
f = open(properties['LogFile'], 'r')
fd = f.fileno()
filesize = os.fstat(fd)[6]
if bytes is not None:
# Display the last N bytes
try:
f.seek(filesize - bytes)
except IOError:
filesize = 0
else:
sys.stdout.write(f.read(bytes))
else:
# Display the last N lines
avg_chars_per_line = 75
while 1:
pos = filesize - (avg_chars_per_line * lines)
try:
f.seek(pos)
except IOError:
filesize = 0
break
buffer = f.read()
if buffer.count('\n') >= lines:
split = buffer.split('\n')
sys.stdout.write('\n'.join(split[-lines:]))
break
# The lines are bigger than we thought. Increase line length
# and try again.
avg_chars_per_line *= 1.3
# Tail file forever, or until killed.
try:
while 1:
st_size = os.fstat(fd)[6]
if st_size == filesize:
time.sleep(interval)
continue
if st_size < filesize:
sys.stderr.write("file truncated\n")
f.seek(st_size)
else:
sys.stdout.write(f.read(st_size - filesize))
filesize = st_size
except KeyboardInterrupt:
f.close()
return
def Register():
from Ft.Lib.CommandLine import Options, Command, Arguments
options = [
Options.Option('c', 'bytes=N',
'output the last N bytes'),
Options.Option('n', 'lines=N',
'output the last N lines, instead of the last 10'),
Options.Option('s', 'sleep-interval=S',
'sleep for approximately S seconds (default 1.0)'
' between iterations'),
]
cmd = Command.Command('view',
'View a 4SS Log',
'',
__doc__,
function = Run,
options = Options.Options(options),
fileName = __file__,
)
return cmd
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