NewsBlur/utils/tlnb.py

#!/usr/bin/env python

import os
import select
import subprocess
import sys

sys.path.insert(0, '/srv/newsblur')

os.environ['DJANGO_SETTINGS_MODULE'] = 'settings'
import fabfile

IGNORE_HOSTS = [
    'push',
]

def main(role="app", role2="app", command=None, path=None):
    streams = list()
    if not path:
        path = "/srv/newsblur/logs/newsblur.log"
    if not command:
        command = "tail -f"

    hosts = fabfile.do(split=True)
    found = set()
    for hostname in (hosts[role] + hosts[role2]):
        if isinstance(hostname, dict):
            address = hostname['address']
            hostname = hostname['name']
        elif ':' in hostname:
            hostname, address = hostname.split(':', 1)
        elif isinstance(hostname, tuple):
            hostname, address = hostname[0], hostname[1]
        else:
            address = hostname
        if any(h in hostname for h in IGNORE_HOSTS): continue
        if hostname in found: continue
        if 'ec2' in hostname:
            s = subprocess.Popen(["ssh", "-i", os.path.expanduser("~/.ec2/sclay.pem"), 
                                  address, "%s %s" % (command, path)], stdout=subprocess.PIPE)
        else:
            s = subprocess.Popen(["ssh", address, "%s %s" % (command, path)], stdout=subprocess.PIPE)
        s.name = hostname
        streams.append(s)
        found.add(hostname)

    try:
        while True:
            r, _, _ = select.select(
                [stream.stdout.fileno() for stream in streams], [], [])
            for fileno in r:
                for stream in streams:
                    if stream.stdout.fileno() != fileno:
                        continue
                    data = os.read(fileno, 4096)
                    if not data:
                        streams.remove(stream)
                        break
                    combination_message = "[%-6s] %s" % (stream.name[:6], data)
                    sys.stdout.write(combination_message)
                    break
    except KeyboardInterrupt:
        print " --- End of Logging ---"

if __name__ == "__main__":
    main(*sys.argv[1:])