CODEWITHSUNDEEP
pythonregex
cybertextron
cybertextron

Reputation: 10981

How to parse a log using some keys - Python

I have the following check_status method:

def check_status(self):
    # each of these is a process I want to make sure they are running.
    status = {
        'pm' : False,
        'om' : False,
        'dm' : False,
        'redis' : False,
    }
    cmd = "sudo %s/foo status" % config.FOO_TOOLS
    output = subprocess.check_output(cmd, shell=True)
    print output
    for k, v in status.iteritems():
        print k

I want to parse output based on the keys of status, and if one of them is Not running I can attempt to restart. I want to do it based on the a regex. Here is an example when the processes are not running:

[WARN] :  current build mode : debug
app: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
pm : Not running
om : Not running
dm : Not running

Conversely, here's an example when the processes are running:

[WARN] :  current build mode : debug
app: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
pm : root 12337 0.0 0.2 455920 9664 [more crap here]
om : root 12383 0.7 3.1 3256848 114936 [more crap here]
dm : root 12516 11.7 0.4 930316 15508 [more crap here]
[INFO] :  redis [pid=5349] running @ [port:6379]

How can I parse output based on the existing key?

Upvotes: 0

Views: 64

Answers (1)

tdelaney
tdelaney

Reputation: 77407

You can process the output line by line looking for information you want. The output has a couple of sections but its simple enough that you can brute force it without the code being too ugly.

proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
# skip [WARN]
proc.stdout.readline()
# look for interesting data in remaining
for line in proc.stdout:
    # terminate after processing the [INFO] section
    if line.startswith('[INFO] :  redis'):
        status['redis'] = True
        for line in proc.stdout:
            pass
        break
    # get the process status
    name, remaining = line.split(' ', 1):
    if name in status:
        status[name] = not 'Not running' in remaining
proc.wait()

Upvotes: 1

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