django-orchestra/orchestra/contrib/orchestration/utils.py

from orchestra.utils.sys import run, sshrun, join


def retrieve_state(servers):
    uptimes = []
    pings = []
    for server in servers:
        address = server.get_address()
        ping = run('ping -c 1 -w 1 %s' % address, run_async=True)
        pings.append(ping)
        uptime = sshrun(address, 'uptime', persist=True, run_async=True, options={'ConnectTimeout': 1})
        uptimes.append(uptime)

    state = {}
    for server, ping, uptime in zip(servers, pings, uptimes):
        ping = join(ping, silent=True)

        try:
            ping = ping.stdout.splitlines()[-1].decode()
        except IndexError:
            ping = ''

        if ping.startswith('rtt'):
            ping = '%s ms' % ping.split('/')[4]
        else:
            ping = '<span style="color:red">Offline</span>'

        uptime = join(uptime, silent=True)
        uptime_stderr = uptime.stderr.decode()
        uptime = uptime.stdout.decode().split()
        if uptime:
            uptime = 'Up %s %s load %s %s %s' % (uptime[2], uptime[3], uptime[-3], uptime[-2], uptime[-1])
        else:
            uptime = '<span style="color:red">%s</span>' % uptime_stderr
        state[server.pk] = (ping, uptime)

    return state