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archive.py
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#!/usr/bin/env python2
# coding: utf-8
import errno
import logging
import shutil
import time
import os
import numpy
from pykit import fsutil
from pykit import humannum
from pykit import net
from pykit import proc
from pykit import timeutil
logger = logging.getLogger(__name__)
class Archiver(object):
def __init__(self, src_base, arc_base, time_toleration=600,
free_gb=20, free_percentage=0, free_interp=None,
days_to_keep=30, at_most_clean=8):
self.src_base = src_base
self.arc_base = arc_base
self.time_toleration = time_toleration
self.free_gb = free_gb
self.free_percentage = free_percentage
self.free_interp = free_interp
self.days_to_keep = days_to_keep
self.at_most_clean = at_most_clean
def archive(self, src_fns=None):
if src_fns is None:
src_fns = [os.path.join(self.src_base, fn) for fn in fsutil.list_fns(self.src_base)]
else:
src_fns = [os.path.join(self.src_base, fn) for fn in src_fns]
for fn in src_fns:
try:
self._archive(fn)
finally:
try:
os.unlink(fn)
except Exception as e:
logger.warn(repr(e) + ' while unlink ' + repr(fn))
def clean(self):
arcs = fsutil.get_sub_dirs(self.arc_base)
arcs = [x for x in arcs
if not os.path.islink(os.path.join(self.arc_base, x))]
arcs_to_clean = self.get_to_clean(arcs)
path_stat = fsutil.get_path_usage(self.arc_base)
capa = path_stat['total']
free = path_stat['available']
min_free = self.get_min_free()
_hum = humannum.humannum
for arc in arcs_to_clean:
# refresh free space
path_stat = fsutil.get_path_usage(self.arc_base)
if path_stat['available'] >= min_free:
break
logger.info("to clean archived log to free up to {min_free} space: {arc_base} / {arc}".format(
min_free=_hum(min_free),
arc_base=self.arc_base,
arc=arc,
))
clean_path = os.path.join(self.arc_base, arc)
try:
shutil.rmtree(clean_path)
except Exception as e:
logger.exception(repr(e) + ' while clean ' + clean_path)
ctx = ('{_dir} free space: {free} / {capa} requires: free >= {min_free}'
' interpolation rule: {free_interp}').format(
_dir=self.arc_base,
free=_hum(free),
capa=_hum(capa),
min_free=_hum(min_free),
free_interp=self.free_interp,
)
if path_stat['available'] >= min_free:
logger.info("disk free space is ok: " + ctx)
else:
logger.warn('all archived log are removed'
' but there is still not enough free space:' + ctx)
def get_to_clean(self, arcs):
for arc in arcs:
arc_path=os.path.join(self.arc_base, arc)
is_dir=os.path.isdir(arc_path)
logger.debug("{arc} {arc_path} isdir: {is_dir}".format(
arc=arc,
arc_path=arc_path,
is_dir=is_dir,
))
toclean = []
# 1 arc is 1 day's archived log
assert self.days_to_keep >= 0
if self.days_to_keep == 0:
toclean = arcs
elif len(arcs) > self.days_to_keep:
toclean = arcs[:-self.days_to_keep]
logger.info("to clean archived log older than {days} days: {toclean}".format(
days=self.days_to_keep,
toclean=toclean,
))
return toclean[:self.at_most_clean]
def get_min_free(self):
path_stat = fsutil.get_path_usage(self.arc_base)
if self.free_interp is not None:
min_free = self.calc_interp(path_stat['total'])
elif self.free_gb is not None:
min_free = self.free_gb * (1024 ** 3)
elif self.free_percentage is not None:
min_free = path_stat['total'] * self.free_percentage
else:
assert False, 'one of free_interp, free_gb, free_percentage must be specified'
return min_free
def calc_interp(self, capa):
if self.free_interp is None:
return None
xp, yp = self.free_interp
_parse = humannum.parsenum
xp = [_parse(x) for x in xp]
yp = [_parse(y) for y in yp]
# if yp is in percentage
yp = [(y if y > 1 else y * xp[i])
for i, y in enumerate(yp)]
return numpy.interp(capa, xp, yp)
def _archive(self, src_path):
arc_dir = self.make_arc_dir()
arc_fn = self.make_arc_fn(src_path)
arc_path = os.path.join(arc_dir, arc_fn)
cmd = "gzip -c '{src}' >> '{dst}'".format(src=src_path, dst=arc_path)
rc, out, err = proc.command(cmd, shell=True)
if rc is 0:
logger.info("archive ok: {src_path} {arc_path}".format(
src_path=src_path, arc_path=arc_path))
else:
logger.warn("archive failure: {src_path} {arc_path} {out} {err}".format(
src_path=src_path, arc_path=arc_path, out=out, err=err))
def make_arc_dir(self):
now_ts = timeutil.ts() - time.timezone - self.time_toleration
date_str = timeutil.format_ts(now_ts, 'daily')
arc_dir = os.path.join(self.arc_base, date_str )
fsutil.makedirs(arc_dir)
symlink_path = os.path.join(self.arc_base, 'current')
while True:
try:
os.symlink(arc_dir, symlink_path)
break
except OSError as e:
if e[0] == errno.EEXIST:
os.unlink(symlink_path)
else:
raise
return arc_dir
def make_arc_fn(self, src_path):
src_fn = os.path.basename(src_path)
iptag = self.ip_tag()
arc_fn = src_fn + "." + iptag + ".gz"
return arc_fn
def ip_tag(self):
ips = net.get_host_ip4()
ips = net.ips_prefer(ips, net.INN)
ip = (ips + [ 'x.x.x.x' ])[ 0 ]
return ip
def archive(src_path, arc_base):
src_dir = os.path.dirname(src_path)
src_fn = os.path.basename(src_path)
archiver = Archiver(src_dir, arc_base)
archiver.archive(src_fn)
def clean(arc_base, **kwargs):
archiver = Archiver('', arc_base, **kwargs)
archiver.clean()