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import os
import logging
import functools
import traceback
import time
from datetime import datetime
from docker.errors import APIError
from sen.constants import PROJECT_NAME, LOG_FILE_NAME
logger = logging.getLogger(__name__)
def _ensure_unicode(s):
try:
return s.decode("utf-8")
except AttributeError:
return s
def log_last_traceback():
logger.error(traceback.format_exc())
def log_traceback(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
logger.info("function %s is about to be started", func)
try:
response = func(*args, **kwargs)
except Exception:
log_last_traceback()
else:
logger.info("function %s finished", func)
# TODO: how long it took?
return response
return wrapper
def setup_dirs():
"""Make required directories to hold logfile.
:returns: str
"""
try:
top_dir = os.path.abspath(os.path.expanduser(os.environ["XDG_CACHE_HOME"]))
except KeyError:
top_dir = os.path.abspath(os.path.expanduser("~/.cache"))
our_cache_dir = os.path.join(top_dir, PROJECT_NAME)
os.makedirs(our_cache_dir, mode=0o775, exist_ok=True)
return our_cache_dir
def get_log_file_path():
return os.path.join(setup_dirs(), LOG_FILE_NAME)
def humanize_bytes(bytesize, precision=2):
"""
Humanize byte size figures
https://gist.github.com/moird/3684595
"""
abbrevs = (
(1 << 50, 'PB'),
(1 << 40, 'TB'),
(1 << 30, 'GB'),
(1 << 20, 'MB'),
(1 << 10, 'kB'),
(1, 'bytes')
)
if bytesize == 1:
return '1 byte'
for factor, suffix in abbrevs:
if bytesize >= factor:
break
if factor == 1:
precision = 0
return '%.*f %s' % (precision, bytesize / float(factor), suffix)
def humanize_time(value):
abbrevs = (
(1, "now"),
(2, "{seconds} seconds ago"),
(59, "{seconds} seconds ago"),
(60, "{minutes} minute ago"),
(119, "{minutes} minute ago"),
(120, "{minutes} minutes ago"),
(3599, "{minutes} minutes ago"),
(3600, "{hours} hour ago"),
(7199, "{hours} hour ago"),
(86399, "{hours} hours ago"),
(86400, "{days} day ago"),
(172799, "{days} day ago"),
(172800, "{days} days ago"),
(172800, "{days} days ago"),
(2591999, "{days} days ago"),
(2592000, "{months} month ago"),
(5183999, "{months} month ago"),
(5184000, "{months} months ago"),
)
n = datetime.now()
delta = n - value
for guard, message in abbrevs:
s = int(delta.total_seconds())
if guard >= s:
break
return message.format(seconds=delta.seconds, minutes=int(delta.seconds // 60),
hours=int(delta.seconds // 3600), days=delta.days,
months=int(delta.days // 30))
# # This function is able to crash python b/c it may write monster-amount of data.
# # Use it only for debugging, do not ship it!
# def log_vars_from_tback(process_frames=5):
# for th in threading.enumerate():
# try:
# thread_frames = sys._current_frames()[th.ident]
# except KeyError:
# continue
# logger.debug(''.join(traceback.format_stack(thread_frames)))
#
# logger.error(traceback.format_exc())
# if process_frames <= 0:
# return
# tb = sys.exc_info()[2]
# while 1:
# if not tb.tb_next:
# break
# tb = tb.tb_next
# stack = []
# f = tb.tb_frame
# while f:
# stack.append(f)
# f = f.f_back
# for frame in stack[:process_frames]:
# logger.debug("frame %s:%s", frame.f_code.co_filename, frame.f_lineno)
# for key, value in frame.f_locals.items():
# try:
# logger.debug("%20s = %s", key, value)
# except Exception:
# logger.debug("%20s = CANNOT PRINT VALUE", key)
#
# # self_instance = frame.f_locals.get("self", None)
# # if not self_instance:
# # continue
# # for key in dir(self_instance):
# # if key.startswith("__"):
# # continue
# # try:
# # value = getattr(self_instance, key, None)
# # logger.debug("%20s = %s", "self." + key, value)
# # except Exception:
# # logger.debug("%20s = CANNOT PRINT VALUE", "self." + key)
# this is taken directly from docker client:
# https://github.com/docker/docker/blob/28a7577a029780e4533faf3d057ec9f6c7a10948/api/client/stats.go#L309
def calculate_cpu_percent(d):
cpu_count = len(d["cpu_stats"]["cpu_usage"]["percpu_usage"])
cpu_percent = 0.0
cpu_delta = float(d["cpu_stats"]["cpu_usage"]["total_usage"]) - \
float(d["precpu_stats"]["cpu_usage"]["total_usage"])
system_delta = float(d["cpu_stats"]["system_cpu_usage"]) - \
float(d["precpu_stats"]["system_cpu_usage"])
if system_delta > 0.0:
cpu_percent = cpu_delta / system_delta * 100.0 * cpu_count
return cpu_percent
# again taken directly from docker:
# https://github.com/docker/cli/blob/2bfac7fcdafeafbd2f450abb6d1bb3106e4f3ccb/cli/command/container/stats_helpers.go#L168
# precpu_stats in 1.13+ is completely broken, doesn't contain any values
def calculate_cpu_percent2(d, previous_cpu, previous_system):
# import json
# du = json.dumps(d, indent=2)
# logger.debug("XXX: %s", du)
cpu_percent = 0.0
cpu_total = float(d["cpu_stats"]["cpu_usage"]["total_usage"])
cpu_delta = cpu_total - previous_cpu
cpu_system = float(d["cpu_stats"]["system_cpu_usage"])
system_delta = cpu_system - previous_system
online_cpus = d["cpu_stats"].get("online_cpus", len(d["cpu_stats"]["cpu_usage"]["percpu_usage"]))
if system_delta > 0.0:
cpu_percent = (cpu_delta / system_delta) * online_cpus * 100.0
return cpu_percent, cpu_system, cpu_total
def calculate_blkio_bytes(d):
"""
:param d:
:return: (read_bytes, wrote_bytes), ints
"""
bytes_stats = graceful_chain_get(d, "blkio_stats", "io_service_bytes_recursive")
if not bytes_stats:
return 0, 0
r = 0
w = 0
for s in bytes_stats:
if s["op"] == "Read":
r += s["value"]
elif s["op"] == "Write":
w += s["value"]
return r, w
def calculate_network_bytes(d):
"""
:param d:
:return: (received_bytes, transceived_bytes), ints
"""
networks = graceful_chain_get(d, "networks")
if not networks:
return 0, 0
r = 0
t = 0
for if_name, data in networks.items():
logger.debug("getting stats for interface %r", if_name)
r += data["rx_bytes"]
t += data["tx_bytes"]
return r, t
def graceful_chain_get(d, *args, default=None):
t = d
for a in args:
try:
t = t[a]
except (KeyError, ValueError, TypeError, AttributeError):
logger.debug("can't get %r from %s", a, t)
return default
return t
def repeater(call, args=None, kwargs=None, retries=4):
"""
repeat call x-times: docker API is just awesome
:param call: function
:param args: tuple, args for function
:param kwargs: dict, kwargs for function
:param retries: int, how many times we try?
:return: response of the call
"""
args = args or ()
kwargs = kwargs or {}
t = 1.0
for x in range(retries):
try:
return call(*args, **kwargs)
except APIError as ex:
logger.error("query #%d: docker returned an error: %r", x, ex)
except Exception as ex:
# this may be pretty bad
log_last_traceback()
logger.error("query #%d: generic error: %r", x, ex)
t *= 2
time.sleep(t)
class OrderedSet(list):
def append(self, p_object):
if p_object in self:
self.remove(p_object)
return super().append(p_object)
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