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from glob import glob
import os.path as pa
from time import sleep, time
import requests
from requests.exceptions import ConnectionError
from urllib import urlretrieve
from uuid import uuid1
import tarfile
import itertools
from fnmatch import fnmatch
import os
def get_values(filename):
with open(filename) as f:
for line in f:
stripped = line.strip()
if stripped:
yield line.strip().split()
class Dispatcher:
def __init__(self, filename):
self.followers_queue = {}
self.lookups_queue = set()
self.short_lookup_queue = set()
self.current_followers = set()
self.current_lookups = set()
self.users = {}
self.last_time = 0
self.servers = {}
self.files = [open(fname) for fname in glob("data/*.txt")]
self.filename = filename
self.update_servers(first=True)
for fh in self.files:
for line in fh:
values = line.strip().split()
self.add_user(*values[:3])
for fname in glob("data/users/lookup*.txt"):
self.aggregate_lookups(fname)
for fname in glob("data/users/[0-9]*.txt"):
self.aggregate_followers(fname)
def __del__(self):
for fh in self.files:
fh.close()
def add_user(self, user_id, user_name, followers_count):
self.users[user_id] = user_name
if (not pa.isfile(pa.join("data", "users", user_id + ".txt"))
and user_id not in self.current_followers):
self.followers_queue[user_id] = (user_name, followers_count)
def aggregate_followers(self, filename):
basename = pa.splitext(pa.basename(filename))[0]
try:
self.current_followers.remove(basename)
except KeyError:
pass
for values in get_values(filename):
if (values[0] not in self.users
and values[0] not in self.current_lookups):
if len(values) == 2:
self.short_lookup_queue.add(tuple(values[:2]))
else:
self.lookups_queue.add(values[0])
def aggregate_lookups(self, filename):
for values in get_values(filename):
self.users[values[0]] = values[1]
try:
self.current_lookups.remove(values[0])
except KeyError:
pass
def update_servers(self, first=False):
ctime = int(time())
if self.last_time >= ctime - 15:
return
else:
self.last_time = ctime
with open(self.filename) as f:
for line in f:
server = line.strip()
self.servers[server] = {}
try:
self.servers[server] = requests.get(server
+ "/status").json()
except ConnectionError:
self.servers[server]["dead"] = True
else:
self.servers[server]["dead"] = False
if int(self.servers[server]["done"]) > 0:
self.fetch_archive(server)
if first:
requests.get(server + "/restart")
def fetch_archive(self, server):
filename = pa.join("data", "users", "archive-"
+ str(uuid1()) + ".tar.gz")
urlretrieve(server + "/fetch", filename)
with tarfile.open(filename, "r:gz") as tar:
tar.extractall()
def get_tar_filenames():
with tarfile.open(filename, "r:gz") as tar:
for tarinfo in tar:
if tarinfo.isfile():
yield tarinfo.name
for fname in get_tar_filenames():
if fnmatch(fname, "*data/users/lookup*.txt"):
self.aggregate_lookups(fname)
for fname in get_tar_filenames():
if fnmatch(fname, "*data/users/[0-9]*.txt"):
self.aggregate_followers(fname)
os.remove(filename)
def clear_followers(self):
shorts = {key: int(value["short"])
for key, value in self.servers.iteritems()
if not value["dead"]}
longs = {key: int(value["long"])
for key, value in self.servers.iteritems()
if not value["dead"]}
while len(self.followers_queue) > 0:
if not shorts:
return
key, value = self.followers_queue.popitem()
if (pa.isfile(pa.join("data", "users", key + ".txt"))
or key in self.current_followers):
continue
self.current_followers.add(key)
if int(value[1]) > 1000:
server = min(longs, key=lambda key: longs[key])
try:
requests.get(server + "/long", params={"id": key})
except ConnectionError:
del shorts[server]
del longs[server]
self.followers_queue[key] = value
self.current_followers.remove(key)
else:
longs[server] += 1
else:
server = min(shorts, key=lambda key: shorts[key])
try:
requests.get(server + "/short",
params={"id": key, "user_name": value[0]})
except ConnectionError:
del shorts[server]
del longs[server]
self.followers_queue[key] = value
self.current_followers.remove(key)
else:
shorts[server] += 1
def clear_lookups(self):
lookups = {key: int(value["lookup"])
for key, value in self.servers.iteritems()
if not value["dead"]}
while len(self.lookups_queue) > 100:
if not lookups:
return
l = [self.lookups_queue.pop() for _ in xrange(100)]
l = [e for e in l
if e not in self.current_lookups and e not in self.users]
for e in l:
self.current_lookups.add(e)
lstr = ",".join(l)
if lstr:
server = min(lookups, key=lambda key: lookups[key])
try:
requests.post(server + "/lookup", data={"list": lstr})
except ConnectionError:
del lookups[server]
for e in l:
self.lookups_queue.add(e)
self.current_lookups.remove(e)
else:
lookups[server] += 1
def clear_short_lookups(self):
lookups = {key: int(value["lookup"])
for key, value in self.servers.iteritems()
if not value["dead"]}
while len(self.short_lookup_queue) > 100:
if not lookups:
return
l = [self.short_lookup_queue.pop() for _ in xrange(100)]
l = [e for e in l
if e[0] not in self.current_lookups
and e[0] not in self.users]
for e in l:
self.current_lookups.add(e[0])
lstr = ",".join(itertools.chain.from_iterable(l))
if lstr:
server = min(lookups, key=lambda key: lookups[key])
try:
requests.post(server + "/short_lookup",
data={"list": lstr})
except ConnectionError:
del lookups[server]
for e in l:
self.short_lookup_queue.add(e)
self.current_lookups.remove(e[0])
else:
lookups[server] += 1
def run(self):
while True:
self.update_servers()
for fh in self.files:
line = fh.readline()
if line:
values = line.strip().split()
self.add_user(*values[:3])
break
else:
sleep(0.5)
self.clear_followers()
self.clear_lookups()
self.clear_short_lookups()
print len(self.current_followers), len(self.current_lookups),\
len(self.followers_queue), len(self.lookups_queue)
if __name__ == "__main__":
import sys
try:
dispatcher = Dispatcher(sys.argv[1])
except IndexError:
print "{0} <server_file>".format(sys.argv[0])
else:
dispatcher.run()
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