#!python

import socket
try:
    import simplejson as json
except ImportError:
    import json
import curses
import time
import atexit
import sys
import traceback
from collections import defaultdict
import errno

need_reset = True
screen = None

def human_size(n):
    # G
    if n >= (1024*1024*1024): 
        return "%.1fG" % (n/(1024*1024*1024))
    # M
    if n >= (1024*1024):
        return "%.1fM" % (n/(1024*1024))
    # K
    if n >= 1024:
        return "%.1fK" % (n/1024)
    return "%d" % n

def game_over():
    global need_reset
    if need_reset:
        curses.echo()
        curses.endwin()

def exc_hook(type, value, tb):
    global need_reset, screen
    need_reset = False
    if screen:
        curses.echo()
        curses.endwin()
    traceback.print_exception(type, value, tb)

sys.excepthook = exc_hook

argc = len(sys.argv)

if argc < 2:
    raise Exception("You have to specify the uWSGI stats socket")

def inet_addr(arg):
    sfamily = socket.AF_INET
    host, port = arg.rsplit(':', 1)
    addr = (host, int(port))
    return sfamily, addr, host

def unix_addr(arg):
    sfamily = socket.AF_UNIX
    addr = arg
    return sfamily, addr, socket.gethostname()

def abstract_unix_addr(arg):
    sfamily = socket.AF_UNIX
    addr = '\0' + arg[1:]
    return sfamily, addr, socket.gethostname()

addr = sys.argv[1]
if ':' in addr:
    sfamily, addr, host = inet_addr(addr)
elif addr.startswith('@'):
    sfamily, addr, host = abstract_unix_addr(addr)
else:
    sfamily, addr, host = unix_addr(addr)

try:
    freq = int(sys.argv[2])
except IndexError:
    freq = 1

screen = curses.initscr()
curses.noecho()
curses.start_color()
curses.use_default_colors()

try:
    # busy
    curses.init_pair(1, curses.COLOR_GREEN, -1)
    # cheap
    curses.init_pair(2, curses.COLOR_MAGENTA, -1)
    # respawn
    curses.init_pair(3, curses.COLOR_RED, -1)
    # sig
    curses.init_pair(4, curses.COLOR_YELLOW, -1)
    # pause
    curses.init_pair(5, curses.COLOR_BLUE, -1)
except curses.error:
    # the terminal doesn't support colors
    pass

atexit.register(game_over)

try:
    curses.curs_set(0)
except:
    pass
screen.clear()

def reqcount(item):
    return item['requests']

def calc_percent(tot, req):
    if tot == 0:
        return 0.0
    return (100 *float(req))/float(tot)

def merge_worker_with_cores(workers, rps_per_worker, cores, rps_per_core):
    workers_by_id = dict([(w['id'], w) for w in workers])
    new_workers = []
    for wid, w_cores in cores.items():
        for core in w_cores:
            cid = core['id']
            data = dict(workers_by_id.get(wid))
            data.update(core)
            if data['status'] == 'busy' and not core['in_request']:
                data['status'] = '-'
            new_wid = "{0}:{1}".format(wid, cid)
            data['id'] = new_wid
            rps_per_worker[new_wid] = rps_per_core[wid, cid]
            new_workers.append(data)
    workers[:] = new_workers

# RPS calculation
last_tot_time = time.time()
last_reqnumber_per_worker = defaultdict(int)
last_reqnumber_per_core = defaultdict(int)

# 0 - do not show async core
# 1 - merge core statistics with worker statistics
# 2 - display active cores under workers
async_mode = 0
fast_screen = 0

while True:

    if fast_screen == 1:
        screen.timeout(100)
    else:
        screen.timeout(freq*1000)

    screen.clear()

    js = ''

    try:
        s = socket.socket(sfamily, socket.SOCK_STREAM)
        s.connect( addr )

        while True:
            data = s.recv(4096)
            if len(data) < 1:
                break
            js += data.decode('utf8')
    except IOError as e:
        if e.errno != errno.EINTR:
            raise
        continue
    except:
        raise Exception("unable to get uWSGI statistics")

    dd = json.loads(js)


    
    uversion = ''
    if 'version' in dd:
        uversion = '-' + dd['version']

    if not 'listen_queue' in dd:
        dd['listen_queue'] = 0 

    cwd = ""
    if 'cwd' in dd:
        cwd = "- cwd: %s" % dd['cwd'] 

    uid = ""
    if 'uid' in dd:
        uid = "- uid: %d" % dd['uid'] 

    gid = ""
    if 'gid' in dd:
        gid = "- gid: %d" % dd['gid'] 

    masterpid = ""
    if 'pid' in dd:
        masterpid = "- masterpid: %d" % dd['pid'] 

    screen.addstr(1, 0, "node: %s %s %s %s %s" % (host, cwd, uid, gid, masterpid))

    if 'vassals' in dd:
        screen.addstr(0, 0, "uwsgi%s - %s - emperor: %s - tyrant: %d" % (uversion, time.ctime(), dd['emperor'], dd['emperor_tyrant']))
        if dd['vassals']:
            vassal_spaces = max([len(v['id']) for v in dd['vassals']])
            screen.addstr(2, 0, " VASSAL%s\tPID\t" % (' ' * (vassal_spaces-6)), curses.A_REVERSE)
            pos = 3
            for vassal in dd['vassals']:
                screen.addstr(pos, 0, " %s\t%d" % (vassal['id'].ljust(vassal_spaces), vassal['pid']))
                pos += 1

    elif 'workers' in dd:
        tot = sum( [worker['requests'] for worker in dd['workers']] )

        rps_per_worker = {}
        rps_per_core = {}
        cores = defaultdict(list)
        dt = time.time() - last_tot_time
        total_rps = 0
        for worker in dd['workers']:
            wid = worker['id']
            curr_reqnumber = worker['requests']
            last_reqnumber = last_reqnumber_per_worker[wid]
            rps_per_worker[wid] = (curr_reqnumber - last_reqnumber) / dt
            total_rps += rps_per_worker[wid]
            last_reqnumber_per_worker[wid] = curr_reqnumber
            if not async_mode:
                continue
            for core in worker.get('cores', []):
                if not core['requests']:
                    # ignore unused cores
                    continue
                wcid = (wid, core['id'])
                curr_reqnumber = core['requests']
                last_reqnumber = last_reqnumber_per_core[wcid]
                rps_per_core[wcid] = (curr_reqnumber - last_reqnumber) / dt
                last_reqnumber_per_core[wcid] = curr_reqnumber
                cores[wid].append(core)
            cores[wid].sort(key=reqcount)

        last_tot_time = time.time()

        if async_mode == 1:
            merge_worker_with_cores(dd['workers'], rps_per_worker,
                                    cores, rps_per_core)

        tx = human_size(sum( [worker['tx'] for worker in dd['workers']] ))
        screen.addstr(0, 0, "uwsgi%s - %s - req: %d - RPS: %d - lq: %d - tx: %s" % (uversion, time.ctime(), tot, int(round(total_rps)), dd['listen_queue'], tx))
        screen.addstr(2, 0, " WID\t%\tPID\tREQ\tRPS\tEXC\tSIG\tSTATUS\tAVG\tRSS\tVSZ\tTX\tReSpwn\tHC\tRunT\tLastSpwn", curses.A_REVERSE)
        pos = 3

        dd['workers'].sort(key=reqcount, reverse=True)
        for worker in dd['workers']:
            sigs = 0
            wtx = human_size(worker['tx'])
            wlastspawn = "--:--:--"

            wrunt = worker['running_time']/1000
            if wrunt > 9999999:
                wrunt = "%sm" % str(wrunt / (1000*60))
            else:
                wrunt = str(wrunt)

            if worker['last_spawn']:
                wlastspawn = time.strftime("%H:%M:%S", time.localtime(worker['last_spawn']))
                
            color = curses.color_pair(0)
            if 'signals' in worker:
                sigs = worker['signals']
            if worker['status'] == 'busy':
                color = curses.color_pair(1)
            if worker['status'] == 'cheap':
                color = curses.color_pair(2)
            if worker['rss'] == 0:
                color = curses.color_pair(3)
            if worker['status'].startswith('sig'):
                color = curses.color_pair(4)
            if worker['status'] == 'pause':
                color = curses.color_pair(5)

            wid = worker['id']

            rps = int(round(rps_per_worker[wid]))

            try:
                screen.addstr(pos, 0, " %s\t%.1f\t%d\t%d\t%d\t%d\t%d\t%s\t%dms\t%s\t%s\t%s\t%s\t%s\t%s\t%s" % (
                    wid, calc_percent(tot, worker['requests']),  worker['pid'], worker['requests'], rps, worker['exceptions'], sigs, worker['status'],
                    worker['avg_rt']/1000, human_size(worker['rss']), human_size(worker['vsz']),
                    wtx, worker['respawn_count'], worker['harakiri_count'], wrunt, wlastspawn
                ), color)
            except:
                pass
            pos += 1
            if async_mode != 2:
                continue
            for core in cores[wid]:
                color = curses.color_pair(0)
                if core['in_request']:
                    status = 'busy'
                    color = curses.color_pair(1)
                else:
                    status = 'idle'

                cid = core['id']
                rps = int(round(rps_per_core[wid, cid]))
                try:
                    screen.addstr(pos, 0, "  :%s\t%.1f\t-\t%d\t%d\t-\t-\t%s\t-\t-\t-\t-\t-" % (
                        cid, calc_percent(tot, core['requests']),  core['requests'], rps, status,
                    ), color)
                except:
                    pass
                pos += 1

    screen.refresh()

    s.close()
    ch = screen.getch()
    if ch == ord('q'):
        game_over()
        break
    elif ch == ord('a'):
        async_mode = (async_mode + 1) % 3
    elif ch == ord('f'):
        fast_screen = (fast_screen + 1) % 2