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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2014-2015, NORDUnet A/S.
# See LICENSE for licensing information.
#
# Distribute the 'sth' file and all missing entries to all frontend nodes.
# See catlfish/doc/merge.txt for more about the merge process.
#
import sys
import json
import requests
import logging
from time import sleep
from base64 import b64encode, b64decode
from os import stat
from certtools import timing_point, create_ssl_context
from mergetools import get_curpos, get_logorder, chunks, get_missingentries, \
publish_sth, sendlog, sendentries, parse_args, perm, \
get_frontend_verifiedsize, frontend_verify_entries, \
waitforfile, flock_ex_or_fail, Status
def sendlog_helper(entries, curpos, nodename, nodeaddress, own_key, paths,
statusupdates):
logging.info("sending log")
for chunk in chunks(entries, 1000):
for trynumber in range(5, 0, -1):
sendlogresult = sendlog(nodename, nodeaddress,
own_key, paths,
{"start": curpos, "hashes": chunk})
if sendlogresult == None:
if trynumber == 1:
sys.exit(1)
sleep(10)
logging.warning("tries left: %d", trynumber)
continue
break
if sendlogresult["result"] != "ok":
logging.error("sendlog: %s", sendlogresult)
sys.exit(1)
curpos += len(chunk)
statusupdates.status("PROG sending log: %d" % curpos)
logging.info("log sent")
def fill_in_missing_entries(nodename, nodeaddress, own_key, paths, chainsdb,
timing, statusupdates):
missingentries = get_missingentries(nodename, nodeaddress, own_key,
paths)
timing_point(timing, "get missing")
while missingentries:
logging.info("about to send %d missing entries", len(missingentries))
sent_entries = 0
with requests.sessions.Session() as session:
for missingentry_chunk in chunks(missingentries, 100):
missingentry_hashes = [b64decode(missingentry) for missingentry in missingentry_chunk]
hashes_and_entries = [(ehash, chainsdb.get(ehash)) for ehash in missingentry_hashes]
sendentryresult = sendentries(nodename, nodeaddress,
own_key, paths,
hashes_and_entries, session)
if sendentryresult["result"] != "ok":
logging.error("sendentries: %s", sendentryresult)
sys.exit(1)
sent_entries += len(missingentry_hashes)
statusupdates.status(
"PROG sending missing entries: %d" % sent_entries)
timing_point(timing, "send missing")
missingentries = get_missingentries(nodename, nodeaddress,
own_key, paths)
timing_point(timing, "get missing")
def merge_dist(args, localconfig, frontendnodes, timestamp):
maxwindow = localconfig.get("maxwindow", 1000)
paths = localconfig["paths"]
own_key = (localconfig["nodename"],
"%s/%s-private.pem" % (paths["privatekeys"],
localconfig["nodename"]))
mergedb = paths["mergedb"]
chainsdb = perm(localconfig.get("dbbackend", "filedb"), mergedb + "/chains")
logorderfile = mergedb + "/logorder"
sthfile = mergedb + "/sth"
statusfile = mergedb + "/merge_dist.status"
s = Status(statusfile)
create_ssl_context(cafile=paths["https_cacertfile"])
timing = timing_point()
try:
sth = json.loads(open(sthfile, 'r').read())
except (IOError, ValueError):
logging.warning("No valid STH file found in %s", sthfile)
return timestamp
if sth['timestamp'] < timestamp:
logging.warning("New STH file older than the previous one: %d < %d",
sth['timestamp'], timestamp)
return timestamp
if sth['timestamp'] == timestamp:
return timestamp
timestamp = sth['timestamp']
logorder = get_logorder(logorderfile, sth['tree_size'])
timing_point(timing, "get logorder")
for frontendnode in frontendnodes:
nodeaddress = "https://%s/" % frontendnode["address"]
nodename = frontendnode["name"]
timing = timing_point()
logging.info("distributing for node %s", nodename)
curpos = get_curpos(nodename, nodeaddress, own_key, paths)
timing_point(timing, "get curpos")
logging.info("current position %d", curpos)
verifiedsize = get_frontend_verifiedsize(nodename, nodeaddress, own_key, paths)
timing_point(timing, "get verified size")
logging.info("verified size %d", verifiedsize)
assert verifiedsize >= curpos
while verifiedsize < len(logorder):
uptopos = min(verifiedsize + maxwindow, len(logorder))
entries = [b64encode(entry) for entry in logorder[verifiedsize:uptopos]]
sendlog_helper(entries, verifiedsize, nodename, nodeaddress, own_key, paths, s)
timing_point(timing, "sendlog")
fill_in_missing_entries(nodename, nodeaddress, own_key, paths, chainsdb, timing, s)
verifiedsize = frontend_verify_entries(nodename, nodeaddress, own_key, paths, uptopos)
logging.info("sending sth to node %s", nodename)
publishsthresult = publish_sth(nodename, nodeaddress, own_key, paths, sth)
if publishsthresult["result"] != "ok":
logging.info("publishsth: %s", publishsthresult)
sys.exit(1)
timing_point(timing, "send sth")
if args.timing:
logging.debug("timing: merge_dist: %s", timing["deltatimes"])
return timestamp
def main():
"""
Wait until 'sth' exists and read it.
Distribute missing entries and the STH to all frontend nodes.
If `--mergeinterval', wait until 'sth' is updated and read it and
start distributing again.
"""
args, config, localconfig = parse_args()
paths = localconfig["paths"]
mergedb = paths["mergedb"]
lockfile = mergedb + "/.merge_dist.lock"
timestamp = 0
loglevel = getattr(logging, args.loglevel.upper())
if args.mergeinterval is None:
logging.basicConfig(level=loglevel)
else:
logging.basicConfig(filename=args.logdir + "/merge_dist.log",
level=loglevel)
if not flock_ex_or_fail(lockfile):
logging.critical("unable to take lock %s", lockfile)
return 1
if len(args.node) == 0:
nodes = config["frontendnodes"]
else:
nodes = [n for n in config["frontendnodes"] if n["name"] in args.node]
if args.mergeinterval is None:
if merge_dist(args, localconfig, nodes, timestamp) < 0:
return 1
return 0
sth_path = localconfig["paths"]["mergedb"] + "/sth"
sth_statinfo = waitforfile(sth_path)
while True:
if merge_dist(args, localconfig, nodes, timestamp) < 0:
return 1
sth_statinfo_old = sth_statinfo
while sth_statinfo == sth_statinfo_old:
sleep(args.mergeinterval / 30)
sth_statinfo = stat(sth_path)
return 0
if __name__ == '__main__':
sys.exit(main())
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