#!/usr/bin/env python
#@author: Prahlad Yeri
#@description: Common functions to interface with linux cli
#@license: MIT
import sys,subprocess,os #,SimpleHTTPServer,SocketServer

arguments = None

def get_stdout(pi):
    result = pi.communicate()
    if len(result[0])>0:
        return result[0]
    else:
        return result[1] #some error has occured

def killall(process):
	cnt=0
	pid =is_process_running(process)
	while pid!=0:
		execute_shell('kill ' + str(pid))
		pid =is_process_running(process)
		cnt+=1
	return cnt

def execute_shell(command, error=''):
    return execute(command, wait=True, shellexec=True, errorstring=error)

def execute(command='', errorstring='', wait=True, shellexec=False, ags=None):
    try:
        if (shellexec):
            p=subprocess.Popen(command, shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
            #print 'verb: ' + str(arguments.verbose)
            if arguments.verbose: print 'command: ' + command
        else:
            p=subprocess.Popen(args=ags)
            if arguments.verbose: print 'command: ' + ags[0]
			
        if wait:
            p.wait()
            result=get_stdout(p)
            return result
        else:
            if arguments.verbose: print 'not waiting'
            return p
    except subprocess.CalledProcessError as e:
        print 'error occured:' + errorstring
        return errorstring
    except Exception as ea:
        print 'Exception occured:' + ea.message
        return errorstring
        #show_message("Error occured: " + ea.message)

def is_process_running(name):
    cmd='ps aux |grep ' + name + ' |grep -v grep'
    s=execute_shell(cmd)
    #return len(s)>0
    if len(s)==0:
        return 0
    else:
        t=s.split()
        return int(t[1])
    
def check_sysfile(filename):
    if os.path.exists('/usr/sbin/' + filename):
        return '/usr/sbin/'  + filename
    elif os.path.exists('/sbin/' + filename):
        return '/sbin/' + filename
    else:
        return ''
  
    
def get_sysctl(setting):
    result = execute_shell('sysctl ' + setting)
    if '=' in result:
        return result.split('=')[1].lstrip()
    else:
        return result

def set_sysctl(setting,value):
    return execute_shell('sysctl -w ' + setting + '=' + value)
    

def writelog(message):
	if arguments.verbose: print message
    #~ global tbuffer
    #~ #tbuffer.insert_at_cursor(message + '\n')
    #~ tbuffer.insert(tbuffer.get_end_iter(),message.strip() + '\n')
    #~ while Gtk.events_pending():
        #~ Gtk.main_iteration()
    #~ #tbuffer.set_text(message + '\n')