/usr/share/pyshared/celery/events/cursesmon.py is in python-celery 2.5.3-4.
This file is owned by root:root, with mode 0o644.
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"""
celery.events.cursesmon
~~~~~~~~~~~~~~~~~~~~~~~
Graphical monitor of Celery events using curses.
:copyright: (c) 2009 - 2012 by Ask Solem.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
from __future__ import with_statement
import curses
import sys
import threading
import time
from datetime import datetime
from itertools import count
from textwrap import wrap
from math import ceil
from .. import __version__
from .. import states
from ..app import app_or_default
from ..utils import abbr, abbrtask
BORDER_SPACING = 4
LEFT_BORDER_OFFSET = 3
UUID_WIDTH = 36
STATE_WIDTH = 8
TIMESTAMP_WIDTH = 8
MIN_WORKER_WIDTH = 15
MIN_TASK_WIDTH = 16
class CursesMonitor(object):
keymap = {}
win = None
screen_width = None
screen_delay = 10
selected_task = None
selected_position = 0
selected_str = "Selected: "
foreground = curses.COLOR_BLACK
background = curses.COLOR_WHITE
online_str = "Workers online: "
help_title = "Keys: "
help = ("j:up k:down i:info t:traceback r:result c:revoke ^c: quit")
greet = "celeryev %s" % __version__
info_str = "Info: "
def __init__(self, state, keymap=None, app=None):
self.app = app_or_default(app)
self.keymap = keymap or self.keymap
self.state = state
default_keymap = {"J": self.move_selection_down,
"K": self.move_selection_up,
"C": self.revoke_selection,
"T": self.selection_traceback,
"R": self.selection_result,
"I": self.selection_info,
"L": self.selection_rate_limit}
self.keymap = dict(default_keymap, **self.keymap)
def format_row(self, uuid, task, worker, timestamp, state):
mx = self.display_width
# include spacing
detail_width = mx - 1 - STATE_WIDTH - 1 - TIMESTAMP_WIDTH
uuid_space = detail_width - 1 - MIN_TASK_WIDTH - 1 - MIN_WORKER_WIDTH
if uuid_space < UUID_WIDTH:
uuid_width = uuid_space
else:
uuid_width = UUID_WIDTH
detail_width = detail_width - uuid_width - 1
task_width = int(ceil(detail_width / 2.0))
worker_width = detail_width - task_width - 1
uuid = abbr(uuid, uuid_width).ljust(uuid_width)
worker = abbr(worker, worker_width).ljust(worker_width)
task = abbrtask(task, task_width).ljust(task_width)
state = abbr(state, STATE_WIDTH).ljust(STATE_WIDTH)
timestamp = timestamp.ljust(TIMESTAMP_WIDTH)
row = "%s %s %s %s %s " % (uuid, worker, task, timestamp, state)
if self.screen_width is None:
self.screen_width = len(row[:mx])
return row[:mx]
@property
def screen_width(self):
_, mx = self.win.getmaxyx()
return mx
@property
def screen_height(self):
my, _ = self.win.getmaxyx()
return my
@property
def display_width(self):
_, mx = self.win.getmaxyx()
return mx - BORDER_SPACING
@property
def display_height(self):
my, _ = self.win.getmaxyx()
return my - 10
@property
def limit(self):
return self.display_height
def find_position(self):
if not self.tasks:
return 0
for i, e in enumerate(self.tasks):
if self.selected_task == e[0]:
return i
return 0
def move_selection_up(self):
self.move_selection(-1)
def move_selection_down(self):
self.move_selection(1)
def move_selection(self, direction=1):
if not self.tasks:
return
pos = self.find_position()
try:
self.selected_task = self.tasks[pos + direction][0]
except IndexError:
self.selected_task = self.tasks[0][0]
keyalias = {curses.KEY_DOWN: "J",
curses.KEY_UP: "K",
curses.KEY_ENTER: "I"}
def handle_keypress(self):
try:
key = self.win.getkey().upper()
except:
return
key = self.keyalias.get(key) or key
handler = self.keymap.get(key)
if handler is not None:
handler()
def alert(self, callback, title=None):
self.win.erase()
my, mx = self.win.getmaxyx()
y = blank_line = count(2).next
if title:
self.win.addstr(y(), 3, title, curses.A_BOLD | curses.A_UNDERLINE)
blank_line()
callback(my, mx, y())
self.win.addstr(my - 1, 0, "Press any key to continue...",
curses.A_BOLD)
self.win.refresh()
while 1:
try:
return self.win.getkey().upper()
except:
pass
def selection_rate_limit(self):
if not self.selected_task:
return curses.beep()
task = self.state.tasks[self.selected_task]
if not task.name:
return curses.beep()
my, mx = self.win.getmaxyx()
r = "New rate limit: "
self.win.addstr(my - 2, 3, r, curses.A_BOLD | curses.A_UNDERLINE)
self.win.addstr(my - 2, len(r) + 3, " " * (mx - len(r)))
rlimit = self.readline(my - 2, 3 + len(r))
if rlimit:
reply = self.app.control.rate_limit(task.name,
rlimit.strip(), reply=True)
self.alert_remote_control_reply(reply)
def alert_remote_control_reply(self, reply):
def callback(my, mx, xs):
y = count(xs).next
if not reply:
self.win.addstr(y(), 3, "No replies received in 1s deadline.",
curses.A_BOLD + curses.color_pair(2))
return
for subreply in reply:
curline = y()
host, response = subreply.items()[0]
host = "%s: " % host
self.win.addstr(curline, 3, host, curses.A_BOLD)
attr = curses.A_NORMAL
text = ""
if "error" in response:
text = response["error"]
attr |= curses.color_pair(2)
elif "ok" in response:
text = response["ok"]
attr |= curses.color_pair(3)
self.win.addstr(curline, 3 + len(host), text, attr)
return self.alert(callback, "Remote Control Command Replies")
def readline(self, x, y):
buffer = str()
curses.echo()
try:
i = 0
while True:
ch = self.win.getch(x, y + i)
if ch != -1:
if ch in (10, curses.KEY_ENTER): # enter
break
if ch in (27, ):
buffer = str()
break
buffer += chr(ch)
i += 1
finally:
curses.noecho()
return buffer
def revoke_selection(self):
if not self.selected_task:
return curses.beep()
reply = self.app.control.revoke(self.selected_task, reply=True)
self.alert_remote_control_reply(reply)
def selection_info(self):
if not self.selected_task:
return
def alert_callback(mx, my, xs):
my, mx = self.win.getmaxyx()
y = count(xs).next
task = self.state.tasks[self.selected_task]
info = task.info(extra=["state"])
infoitems = [("args", info.pop("args", None)),
("kwargs", info.pop("kwargs", None))] + info.items()
for key, value in infoitems:
if key is None:
continue
value = str(value)
curline = y()
keys = key + ": "
self.win.addstr(curline, 3, keys, curses.A_BOLD)
wrapped = wrap(value, mx - 2)
if len(wrapped) == 1:
self.win.addstr(curline, len(keys) + 3,
abbr(wrapped[0],
self.screen_width - (len(keys) + 3)))
else:
for subline in wrapped:
nexty = y()
if nexty >= my - 1:
subline = " " * 4 + "[...]"
elif nexty >= my:
break
self.win.addstr(nexty, 3,
abbr(" " * 4 + subline, self.screen_width - 4),
curses.A_NORMAL)
return self.alert(alert_callback,
"Task details for %s" % self.selected_task)
def selection_traceback(self):
if not self.selected_task:
return curses.beep()
task = self.state.tasks[self.selected_task]
if task.state not in states.EXCEPTION_STATES:
return curses.beep()
def alert_callback(my, mx, xs):
y = count(xs).next
for line in task.traceback.split("\n"):
self.win.addstr(y(), 3, line)
return self.alert(alert_callback,
"Task Exception Traceback for %s" % self.selected_task)
def selection_result(self):
if not self.selected_task:
return
def alert_callback(my, mx, xs):
y = count(xs).next
task = self.state.tasks[self.selected_task]
result = getattr(task, "result", None) or getattr(task,
"exception", None)
for line in wrap(result, mx - 2):
self.win.addstr(y(), 3, line)
return self.alert(alert_callback,
"Task Result for %s" % self.selected_task)
def display_task_row(self, lineno, task):
state_color = self.state_colors.get(task.state)
attr = curses.A_NORMAL
if task.uuid == self.selected_task:
attr = curses.A_STANDOUT
timestamp = datetime.utcfromtimestamp(
task.timestamp or time.time())
timef = timestamp.strftime("%H:%M:%S")
hostname = task.worker.hostname if task.worker else '*NONE*'
line = self.format_row(task.uuid, task.name,
hostname,
timef, task.state)
self.win.addstr(lineno, LEFT_BORDER_OFFSET, line, attr)
if state_color:
self.win.addstr(lineno,
len(line) - STATE_WIDTH + BORDER_SPACING - 1,
task.state, state_color | attr)
def draw(self):
win = self.win
self.handle_keypress()
x = LEFT_BORDER_OFFSET
y = blank_line = count(2).next
my, mx = win.getmaxyx()
win.erase()
win.bkgd(" ", curses.color_pair(1))
win.border()
win.addstr(1, x, self.greet, curses.A_DIM | curses.color_pair(5))
blank_line()
win.addstr(y(), x, self.format_row("UUID", "TASK",
"WORKER", "TIME", "STATE"),
curses.A_BOLD | curses.A_UNDERLINE)
tasks = self.tasks
if tasks:
for row, (uuid, task) in enumerate(tasks):
if row > self.display_height:
break
if task.uuid:
lineno = y()
self.display_task_row(lineno, task)
# -- Footer
blank_line()
win.hline(my - 6, x, curses.ACS_HLINE, self.screen_width - 4)
# Selected Task Info
if self.selected_task:
win.addstr(my - 5, x, self.selected_str, curses.A_BOLD)
info = "Missing extended info"
detail = ""
try:
selection = self.state.tasks[self.selected_task]
except KeyError:
pass
else:
info = selection.info(["args", "kwargs",
"result", "runtime", "eta"])
if "runtime" in info:
info["runtime"] = "%.2fs" % info["runtime"]
if "result" in info:
info["result"] = abbr(info["result"], 16)
info = " ".join("%s=%s" % (key, value)
for key, value in info.items())
detail = "... -> key i"
infowin = abbr(info,
self.screen_width - len(self.selected_str) - 2,
detail)
win.addstr(my - 5, x + len(self.selected_str), infowin)
# Make ellipsis bold
if detail in infowin:
detailpos = len(infowin) - len(detail)
win.addstr(my - 5, x + len(self.selected_str) + detailpos,
detail, curses.A_BOLD)
else:
win.addstr(my - 5, x, "No task selected", curses.A_NORMAL)
# Workers
if self.workers:
win.addstr(my - 4, x, self.online_str, curses.A_BOLD)
win.addstr(my - 4, x + len(self.online_str),
", ".join(sorted(self.workers)), curses.A_NORMAL)
else:
win.addstr(my - 4, x, "No workers discovered.")
# Info
win.addstr(my - 3, x, self.info_str, curses.A_BOLD)
win.addstr(my - 3, x + len(self.info_str),
"events:%s tasks:%s workers:%s/%s" % (
self.state.event_count, self.state.task_count,
len([w for w in self.state.workers.values()
if w.alive]),
len(self.state.workers)),
curses.A_DIM)
# Help
self.safe_add_str(my - 2, x, self.help_title, curses.A_BOLD)
self.safe_add_str(my - 2, x + len(self.help_title), self.help,
curses.A_DIM)
win.refresh()
def safe_add_str(self, y, x, string, *args, **kwargs):
if x + len(string) > self.screen_width:
string = string[:self.screen_width - x]
self.win.addstr(y, x, string, *args, **kwargs)
def init_screen(self):
self.win = curses.initscr()
self.win.nodelay(True)
self.win.keypad(True)
curses.start_color()
curses.init_pair(1, self.foreground, self.background)
# exception states
curses.init_pair(2, curses.COLOR_RED, self.background)
# successful state
curses.init_pair(3, curses.COLOR_GREEN, self.background)
# revoked state
curses.init_pair(4, curses.COLOR_MAGENTA, self.background)
# greeting
curses.init_pair(5, curses.COLOR_BLUE, self.background)
# started state
curses.init_pair(6, curses.COLOR_YELLOW, self.foreground)
self.state_colors = {states.SUCCESS: curses.color_pair(3),
states.REVOKED: curses.color_pair(4),
states.STARTED: curses.color_pair(6)}
for state in states.EXCEPTION_STATES:
self.state_colors[state] = curses.color_pair(2)
curses.cbreak()
def resetscreen(self):
curses.nocbreak()
self.win.keypad(False)
curses.echo()
curses.endwin()
def nap(self):
curses.napms(self.screen_delay)
@property
def tasks(self):
return self.state.tasks_by_timestamp()[:self.limit]
@property
def workers(self):
return [hostname
for hostname, w in self.state.workers.items()
if w.alive]
class DisplayThread(threading.Thread):
def __init__(self, display):
self.display = display
self.shutdown = False
threading.Thread.__init__(self)
def run(self):
while not self.shutdown:
self.display.draw()
self.display.nap()
def capture_events(app, state, display):
def on_connection_error(exc, interval):
sys.stderr.write("Connection Error: %r. Retry in %ss." % (
exc, interval))
while 1:
sys.stderr.write("-> evtop: starting capture...\n")
with app.broker_connection() as conn:
try:
conn.ensure_connection(on_connection_error,
app.conf.BROKER_CONNECTION_MAX_RETRIES)
recv = app.events.Receiver(conn, handlers={"*": state.event})
display.resetscreen()
display.init_screen()
with recv.consumer():
recv.drain_events(timeout=1, ignore_timeouts=True)
except (conn.connection_errors, conn.channel_errors), exc:
sys.stderr.write("Connection lost: %r" % (exc, ))
def evtop(app=None):
app = app_or_default(app)
state = app.events.State()
display = CursesMonitor(state, app=app)
display.init_screen()
refresher = DisplayThread(display)
refresher.start()
try:
capture_events(app, state, display)
except Exception:
refresher.shutdown = True
refresher.join()
display.resetscreen()
raise
except (KeyboardInterrupt, SystemExit):
refresher.shutdown = True
refresher.join()
display.resetscreen()
if __name__ == "__main__":
evtop()
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