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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2014-2016, NORDUnet A/S.
# See LICENSE for licensing information.
#
# Copy entries indicated by file 'fetched' to all secondary merge nodes.
# See catlfish/doc/merge.txt for more about the merge process.
#
import sys
import base64
import select
import requests
from time import sleep
from base64 import b64encode, b64decode
from certtools import timing_point, build_merkle_tree, write_file, \
create_ssl_context
from mergetools import chunks, backup_sendlog, get_logorder, \
get_verifiedsize, get_missingentriesforbackup, \
hexencode, setverifiedsize, sendentries_merge, verifyroot, \
get_nfetched, parse_args, perm
def backup_loop(nodename, nodeaddress, own_key, paths, verifiedsize, chunk):
for trynumber in range(5, 0, -1):
sendlogresult = \
backup_sendlog(nodename, nodeaddress, own_key, paths,
{"start": verifiedsize, "hashes": chunk})
if sendlogresult == None:
if trynumber == 1:
return None
select.select([], [], [], 10.0)
print >>sys.stderr, "tries left:", trynumber
sys.stderr.flush()
continue
return sendlogresult
sendlog_discover_chunksize = 100000
def sendlog_helper(entries, verifiedsize, nodename, nodeaddress, own_key, paths):
print >>sys.stderr, "sending log:",
sys.stderr.flush()
for chunk in chunks(entries, 1000):
sendlogresult = backup_loop(nodename, nodeaddress, own_key, paths, verifiedsize, chunk)
if sendlogresult == None:
sys.exit(1)
if sendlogresult["result"] != "ok":
print >>sys.stderr, "backup_sendlog:", sendlogresult
sys.exit(1)
verifiedsize += len(chunk)
print >>sys.stderr, verifiedsize,
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_missingentriesforbackup(nodename, nodeaddress,
own_key, paths)
timing_point(timing, "get missing")
while missingentries:
print >>sys.stderr, "missing entries:", len(missingentries)
sys.stderr.flush()
fetched_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_merge(nodename, nodeaddress,
own_key, paths,
hashes_and_entries, session)
if sendentryresult["result"] != "ok":
print >>sys.stderr, "sendentries_merge:", sendentryresult
sys.exit(1)
fetched_entries += len(missingentry_hashes)
#print >>sys.stderr, fetched_entries,
#sys.stderr.flush()
print >>sys.stderr
sys.stderr.flush()
timing_point(timing, "send missing")
missingentries = get_missingentriesforbackup(nodename, nodeaddress,
own_key, paths)
timing_point(timing, "get missing")
def check_root(logorder, nodename, nodeaddress, own_key, paths, tree_size, timing):
tree = build_merkle_tree(logorder[:tree_size])
root_hash = tree[-1][0]
timing_point(timing, "build tree")
verifyrootresult = verifyroot(nodename, nodeaddress, own_key, paths,
tree_size)
if verifyrootresult["result"] != "ok":
print >>sys.stderr, "verifyroot:", verifyrootresult
sys.exit(1)
secondary_root_hash = base64.b64decode(verifyrootresult["root_hash"])
if root_hash != secondary_root_hash:
print >>sys.stderr, "secondary root hash was", \
hexencode(secondary_root_hash)
print >>sys.stderr, " expected", hexencode(root_hash)
sys.exit(1)
timing_point(timing, "verifyroot")
return root_hash
def merge_backup(args, config, localconfig, secondaries):
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"
currentsizefile = mergedb + "/fetched"
timing = timing_point()
nfetched = get_nfetched(currentsizefile, logorderfile)
timing_point(timing, "get nfetched")
logorder = get_logorder(logorderfile, nfetched)
tree_size = len(logorder)
timing_point(timing, "get logorder")
for secondary in secondaries:
if secondary["name"] == config["primarymergenode"]:
continue
nodeaddress = "https://%s/" % secondary["address"]
nodename = secondary["name"]
timing = timing_point()
print >>sys.stderr, "backing up to node", nodename
sys.stderr.flush()
verifiedsize = get_verifiedsize(nodename, nodeaddress, own_key, paths)
timing_point(timing, "get verified size")
print >>sys.stderr, "verified size", verifiedsize
sys.stderr.flush()
if verifiedsize == tree_size:
root_hash = check_root(logorder, nodename, nodeaddress, own_key, paths, tree_size, timing)
else:
while verifiedsize < tree_size:
uptopos = min(verifiedsize + maxwindow, tree_size)
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)
root_hash = check_root(logorder, nodename, nodeaddress, own_key, paths, uptopos, timing)
verifiedsize = uptopos
setverifiedsize(nodename, nodeaddress, own_key, paths, verifiedsize)
backuppath = mergedb + "/verified." + nodename
backupdata = {"tree_size": tree_size,
"sha256_root_hash": hexencode(root_hash)}
#print >>sys.stderr, "DEBUG: writing to", backuppath, ":", backupdata
write_file(backuppath, backupdata)
if args.timing:
print >>sys.stderr, "timing: merge_backup:", timing["deltatimes"]
sys.stderr.flush()
def main():
"""
Read logorder file up until what's indicated by fetched file and
build the tree.
Distribute entries to all secondaries, write tree size and tree head
to backup.<secondary> files as each secondary is verified to have
the entries.
Sleep some and start over.
"""
args, config, localconfig = parse_args()
all_secondaries = \
[n for n in config.get('mergenodes', []) if \
n['name'] != config['primarymergenode']]
paths = localconfig["paths"]
create_ssl_context(cafile=paths["https_cacertfile"])
if len(args.node) == 0:
nodes = all_secondaries
else:
nodes = [n for n in all_secondaries if n["name"] in args.node]
while True:
merge_backup(args, config, localconfig, nodes)
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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