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#!/usr/bin/python
# coding: utf-8
#
# pkgdistcache client v0.3.1
# by Alessio Bianchi <venator85@gmail.com>
#
import os
import os.path
import pickle
import string
import subprocess
import sys
import time
import avahi
import dbus
import dbus.glib
import requests
import xdg.BaseDirectory
from gi.repository import GObject
colors = {
'none': '\033[0m',
'black': '\033[0;30m', 'bold_black': '\033[1;30m',
'red': '\033[0;31m', 'bold_red': '\033[1;31m',
'green': '\033[0;32m', 'bold_green': '\033[1;32m',
'yellow': '\033[0;33m', 'bold_yellow': '\033[1;33m',
'blue': '\033[0;34m', 'bold_blue': '\033[1;34m',
'magenta': '\033[0;35m', 'bold_magenta': '\033[1;35m',
'cyan': '\033[0;36m', 'bold_cyan': '\033[1;36m',
'white': '\033[0;37m', 'bold_white': '\033[1;37m'}
def printmsg(msg):
print("%s>> %s%s" % (colors['bold_blue'], msg, colors['none']))
def printerr(msg):
print("%s!! %s%s" % (colors['bold_red'], msg, colors['none']))
def printwarn(msg):
print("%s!! %s%s" % (colors['bold_yellow'], msg, colors['none']))
# Run a command synchronously, sending stdout and stderr to shell
def runcmd2(cmd, cwd=None):
pipe = subprocess.Popen(cmd, shell=True, cwd=cwd, stdout=None, stderr=None)
pipe.communicate() # wait for process to terminate
return pipe.returncode
class Service(object):
def __init__(self, service, host, ip, port):
self.service = service
self.host = host
self.ip = ip
self.port = port
def __str__(self):
return ("(%s, %s, %s, %d)"
% (self.service, self.host, self.ip, self.port))
def __repr__(self):
# il tostring sulle liste รจ repr
return self.__str__()
def __hash__(self):
return hash(self.__str__())
def __eq__(self, other):
return hash(self) == hash(other)
class AvahiBrowser(object):
def __init__(self):
# Connect to the system bus...
self.bus = dbus.SystemBus()
# Get a proxy to the object we want to talk to.
avahi_proxy = self.bus.get_object(
avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER)
# Set the interface we want to use; server in this case.
self.server = dbus.Interface(avahi_proxy, avahi.DBUS_INTERFACE_SERVER)
self.version_string = self.server.GetVersionString()
self.domain = "local"
self.loop = GObject.MainLoop()
self.services = []
def browse(self, stype):
# Ask the server for a path to the browser object for the service we're
# interested in...
browser_path = self.server.ServiceBrowserNew(
avahi.IF_UNSPEC,
avahi.PROTO_UNSPEC,
stype,
self.domain,
dbus.UInt32(0))
# Get it's proxy object...
browser_proxy = self.bus.get_object(avahi.DBUS_NAME, browser_path)
# And set the interface we want to use
browser = dbus.Interface(
browser_proxy, avahi.DBUS_INTERFACE_SERVICE_BROWSER)
# Now connect the call backs to the relevant signals.
browser.connect_to_signal('ItemNew', self.new_service)
browser.connect_to_signal('AllForNow', self.all_for_now)
self.loop.run()
return self.services
def new_service(self, interface, protocol, name, stype, domain, flags):
if flags & avahi.LOOKUP_RESULT_LOCAL:
# The service is on this machine; ignore
return
try:
s = self.server.ResolveService(
interface,
protocol,
name,
stype,
domain,
avahi.PROTO_UNSPEC,
dbus.UInt32(0))
# service name, host, ip, port
service = Service(str(s[3]), str(s[2]), str(s[7]), int(s[8]))
self.services.append(service)
except dbus.DBusException as ex:
# Mainly expect to see:
# org.freedesktop.Avahi.TimeoutError: Timeout reached
printwarn(ex)
def all_for_now(self):
self.loop.quit()
def main(argv):
# load configuration file
conf_file = '/etc/pkgdistcache.conf'
if os.path.isfile(conf_file):
config = eval(open(conf_file).read())
else:
printerr("Config file " + conf_file + " not found")
return 2
download_cmd_template = string.Template(config['download_cmd'])
pkg = os.path.basename(argv[1]) # argv[1] = %u passed by pacman
must_download = True
if not (pkg.endswith('.db') or pkg.endswith('.db.sig')):
runtime_dir = xdg.BaseDirectory.get_runtime_dir(strict=False)
cache_file = os.path.join(runtime_dir, 'pkgdistcache')
try:
# No exception means file exists
stat = os.stat(cache_file)
# Check age of file
cache_life_secs = int(config['cache_file_life']) * 60
cache_valid = time.time() < stat.st_mtime + cache_life_secs
except FileNotFoundError:
cache_valid = False
if cache_valid:
with open(cache_file, 'rb') as f:
pkgdistcache_clients = pickle.load(f)
else:
# recent cache file not found, discover other pkgdistcache capable
# hosts via avahi and save result to a new cache file
browser = AvahiBrowser()
clients = browser.browse("_pkgdistcache._tcp")
# remove duplicates (eg services offered on more than a network
# card etc.)
clients = set(clients)
pkgdistcache_clients = list(clients)
try:
os.unlink(cache_file) # remove any old cache file
except FileNotFoundError:
pass
with open(cache_file, 'wb') as f:
pickle.dump(pkgdistcache_clients, f, -1)
if pkgdistcache_clients:
print("-- Discovered hosts: %s"
% ", ".join(set([c.host for c in pkgdistcache_clients])))
else:
print("-- No hosts discovered")
for client in pkgdistcache_clients:
clientip = client.ip
if ":" in clientip:
clientip = "[" + clientip + "]"
url = "http://" + clientip + ":" + str(client.port) + "/" + pkg
try:
r = requests.head(url, timeout=1)
except Exception as e:
printwarn("Failed checking host '%s' with ip '%s': %s"
% (client.host, clientip, repr(e)))
continue
if r.status_code != 200:
continue
dst = argv[2]
printmsg("Downloading %s from host '%s'" % (pkg, client.host))
download_cmd = download_cmd_template.substitute(
{'u': url, 'o': dst})
try:
ret = runcmd2(download_cmd)
if ret == 0:
must_download = False
break
else:
printwarn("Host '%s' doesn't have %s in cache"
% (client.host, pkg))
except KeyboardInterrupt:
printerr("Aborted")
return 1
# download package file from mirror if necessary
if must_download:
print(">> Downloading %s from mirror" % pkg)
try:
download_cmd = download_cmd_template.substitute(
{'u': argv[1], 'o': argv[2]})
return runcmd2(download_cmd)
except KeyboardInterrupt:
printerr("Aborted")
return 1
else:
return 0
if __name__ == '__main__':
sys.exit(main(sys.argv))
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