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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2014-2016, 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 base64
import requests
from time import sleep
from base64 import b64encode, b64decode
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
def sendlog_helper(entries, curpos, nodename, nodeaddress, own_key, paths):
print >>sys.stderr, "sending log:",
sys.stderr.flush()
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)
print >>sys.stderr, "tries left:", trynumber
sys.stderr.flush()
continue
break
if sendlogresult["result"] != "ok":
print >>sys.stderr, "sendlog:", sendlogresult
sys.exit(1)
curpos += len(chunk)
print >>sys.stderr, curpos,
sys.stderr.flush()
print >>sys.stderr
print >>sys.stderr, "log sent"
sys.stderr.flush()
def fill_in_missing_entries(nodename, nodeaddress, own_key, paths, chainsdb, timing):
missingentries = get_missingentries(nodename, nodeaddress, own_key,
paths)
timing_point(timing, "get missing")
while missingentries:
print >>sys.stderr, "missing entries:", len(missingentries)
sys.stderr.flush()
sent_entries = 0
print >>sys.stderr, "sending missing entries",
sys.stderr.flush()
with requests.sessions.Session() as session:
for missingentry_chunk in chunks(missingentries, 100):
missingentry_hashes = [base64.b64decode(missingentry) for missingentry in missingentry_chunk]
hashes_and_entries = [(hash, chainsdb.get(hash)) for hash in missingentry_hashes]
sendentryresult = sendentries(nodename, nodeaddress,
own_key, paths,
hashes_and_entries, session)
if sendentryresult["result"] != "ok":
print >>sys.stderr, "sendentries:", sendentryresult
sys.exit(1)
sent_entries += len(missingentry_hashes)
print >>sys.stderr, sent_entries,
sys.stderr.flush()
print >>sys.stderr
sys.stderr.flush()
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["db"]
chainsdb = perm(localconfig["dbbackend"], mergedb + "/chains")
logorderfile = mergedb + "/logorder"
sthfile = mergedb + "/sth"
create_ssl_context(cafile=paths["https_cacertfile"])
timing = timing_point()
try:
sth = json.loads(open(sthfile, 'r').read())
except (IOError, ValueError):
print >>sys.stderr, "No valid STH file found in", sthfile
return timestamp
if sth['timestamp'] < timestamp:
print >>sys.stderr, "New STH file older than the previous one:", \
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()
print >>sys.stderr, "distributing for node", nodename
sys.stderr.flush()
curpos = get_curpos(nodename, nodeaddress, own_key, paths)
timing_point(timing, "get curpos")
print >>sys.stderr, "current position", curpos
sys.stderr.flush()
verifiedsize = get_frontend_verifiedsize(nodename, nodeaddress, own_key, paths)
timing_point(timing, "get verified size")
print >>sys.stderr, "verified size", 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)
timing_point(timing, "sendlog")
fill_in_missing_entries(nodename, nodeaddress, own_key, paths, chainsdb, timing)
verifiedsize = frontend_verify_entries(nodename, nodeaddress, own_key, paths, uptopos)
print >>sys.stderr, "sending sth to node", nodename
sys.stderr.flush()
publishsthresult = publish_sth(nodename, nodeaddress, own_key, paths, sth)
if publishsthresult["result"] != "ok":
print >>sys.stderr, "publishsth:", publishsthresult
sys.exit(1)
timing_point(timing, "send sth")
if args.timing:
print >>sys.stderr, "timing: merge_dist:", timing["deltatimes"]
sys.stderr.flush()
return timestamp
def main():
"""
Distribute missing entries and the STH to all frontend nodes.
"""
args, config, localconfig = parse_args()
timestamp = 0
if len(args.node) == 0:
nodes = config["frontendnodes"]
else:
nodes = [n for n in config["frontendnodes"] if n["name"] in args.node]
while True:
timestamp = merge_dist(args, localconfig, nodes, timestamp)
if args.interval is None:
break
print >>sys.stderr, "sleeping", args.interval, "seconds"
sleep(args.interval)
if __name__ == '__main__':
sys.exit(main())
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