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#!/usr/bin/python

from gearman import GearmanWorker
import subprocess
import json
import time
import re

def shutdownWorker(worker, job):
    ret = {"rawoutput": "", "rc": -1}
    target = job.data.strip()
    
    validIpAddressRegex = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
    validHostnameRegex = "^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$"
    if not (re.match(validIpAddressRegex, target) or re.match(validHostnameRegex, target)):
        print 'malformed request'
        return json.dumps({"err":"invalid parameter - must be ip or host address", "alive":False}) + "\n"

    
    host = target
    port = 22
    user = "root"
    sshopts = "-o PasswordAuthentication=no -a"
    keyfile = "/etc/systemd/workers.ssh/id_rsa"
    remotecmd = "shutdown -h now"

    cmd = "ssh -p {p} -l {l} -i {i} {o} {h} {r}".format(p=port, l=user, i=keyfile, o=sshopts, h=host, r=remotecmd)
    print cmd
    
    sshCommand = subprocess.Popen(["sh", "-c", "%s" % cmd],
                               stdin=subprocess.PIPE, 
                               stdout=subprocess.PIPE, 
                               stderr=subprocess.PIPE)
    
    while sshCommand.returncode == None:
        out = sshCommand.stdout.readline()
        if out != "":
            ret['rawoutput'] += out
        time.sleep(0.05)      
        sshCommand.poll()
        
    while True:
        out = sshCommand.stdout.readline()
        if out != "":
            ret['rawoutput'] += out
        else:
            break
            
    ret['rawoutput'] = ret['rawoutput'].strip() # get rid of newlines
    rc = ret['rc'] = sshCommand.returncode
    
    if  rc == 0:
        print 'remote command successful.'
        return json.dumps(ret) + "\n"
    else:
        ret['err'] = ""
        while True:
            out = sshCommand.stderr.readline()
            if out != "":
                ret['err'] += out
            else:
                break
        print 'remote command failed'
        return json.dumps(ret) + "\n"
    
    
worker = GearmanWorker(["127.0.0.1"])
worker.register_task('doShutdown', shutdownWorker)
worker.work()