#!/usr/bin/env python
#
# $Id$
#
# Copyright (c) 2009, Jay Loden, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""
Print detailed information about a process.

Author: Giampaolo Rodola' <g.rodola@gmail.com>
"""

import os
import datetime
import socket
import sys

import psutil


def convert_bytes(n):
    symbols = ('K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y')
    prefix = {}
    for i, s in enumerate(symbols):
        prefix[s] = 1 << (i+1)*10
    for s in reversed(symbols):
        if n >= prefix[s]:
            value = float(n) / prefix[s]
            return '%.1f%s' % (value, s)
    return "%sB" % n

def print_(a, b):
    if sys.stdout.isatty() and os.name == 'posix':
        fmt = '\x1b[1;32m%-17s\x1b[0m %s' %(a, b)
    else:
        fmt = '%-15s %s' %(a, b)
    # python 2/3 compatibility layer
    sys.stdout.write(fmt + '\n')
    sys.stdout.flush()

def run(pid):
    ACCESS_DENIED = ''
    try:
        p = psutil.Process(pid)
        pinfo = p.as_dict(ad_value=ACCESS_DENIED)
    except psutil.NoSuchProcess:
        sys.exit(str(sys.exc_info()[1]))

    try:
        if p.parent:
            parent = '(%s)' % p.parent.name
        else:
            parent = ''
    except psutil.Error:
        parent = ''
    started = datetime.datetime.fromtimestamp(pinfo['create_time']
                                                ).strftime('%Y-%M-%d %H:%M')
    io = pinfo.get('io_counters', None)
    mem = '%s%% (resident=%s, virtual=%s) ' % (
                                      round(pinfo['memory_percent'], 1),
                                      convert_bytes(pinfo['memory_info'].rss),
                                      convert_bytes(pinfo['memory_info'].vms))
    children = p.get_children()

    print_('pid', pinfo['pid'])
    print_('name', pinfo['name'])
    print_('exe', pinfo['exe'])
    print_('parent', '%s %s' % (pinfo['ppid'], parent))
    print_('cmdline', ' '.join(pinfo['cmdline']))
    print_('started', started)
    print_('user', pinfo['username'])
    if os.name == 'posix':
        print_('uids', 'real=%s, effective=%s, saved=%s' % pinfo['uids'])
        print_('gids', 'real=%s, effective=%s, saved=%s' % pinfo['gids'])
        print_('terminal', pinfo['terminal'] or '')
    if hasattr(p, 'getcwd'):
        print_('cwd', pinfo['cwd'])
    print_('memory', mem)
    print_('cpu', '%s%% (user=%s, system=%s)' % (pinfo['cpu_percent'],
                                                 pinfo['cpu_times'].user,
                                                 pinfo['cpu_times'].system))
    print_('status', pinfo['status'])
    print_('niceness', pinfo['nice'])
    print_('num threads', pinfo['num_threads'])
    if io != ACCESS_DENIED:
        print_('I/O', 'bytes-read=%s, bytes-written=%s' % \
                                               (convert_bytes(io.read_bytes),
                                                convert_bytes(io.write_bytes)))
    if children:
        print_('children', '')
        for child in children:
            print_('', 'pid=%s name=%s' % (child.pid, child.name))

    if pinfo['open_files'] != ACCESS_DENIED:
        print_('open files', '')
        for file in pinfo['open_files']:
            print_('',  'fd=%s %s ' % (file.fd, file.path))

    if pinfo['threads']:
        print_('running threads', '')
        for thread in pinfo['threads']:
            print_('',  'id=%s, user-time=%s, sys-time=%s' \
                         % (thread.id, thread.user_time, thread.system_time))
    if pinfo['connections'] != ACCESS_DENIED:
        print_('open connections', '')
        for conn in pinfo['connections']:
            if conn.type == socket.SOCK_STREAM:
                type = 'TCP'
            elif conn.type == socket.SOCK_DGRAM:
                type = 'UDP'
            else:
                type = 'UNIX'
            lip, lport = conn.local_address
            if not conn.remote_address:
                rip, rport = '*', '*'
            else:
                rip, rport = conn.remote_address
            print_('',  '%s:%s -> %s:%s type=%s status=%s' \
                         % (lip, lport, rip, rport, type, conn.status))

def main(argv=None):
    if argv is None:
        argv = sys.argv
    if len(argv) == 1:
        sys.exit(run(os.getpid()))
    elif len(argv) == 2:
        sys.exit(run(int(argv[1])))
    else:
        sys.exit('usage: %s [pid]' % __file__)

if __name__ == '__main__':
    sys.exit(main())
