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# Copyright (c) 2010-2011 Red Hat, Inc.
#
# This file is part of HekaFS.
#
# HekaFS is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License, version 3, as published by the Free
# Software Foundation.
#
# HekaFS is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License * along
# with HekaFS. If not, see <http://www.gnu.org/licenses/>.
from __future__ import print_function
import copy
import string
import sys
import types
good_xlators = [
"cluster/afr",
"cluster/dht",
"cluster/distribute",
"cluster/replicate",
"cluster/stripe",
"debug/io-stats",
"features/access-control",
"features/locks",
"features/marker",
"features/uidmap",
"performance/io-threads",
"protocol/client",
"protocol/server",
"storage/posix",
]
def copy_stack (old_xl, suffix, recursive=False):
if recursive:
new_name = old_xl.name + "-" + suffix
else:
new_name = suffix
new_xl = Translator(new_name)
new_xl.type = old_xl.type
# The results with normal assignment here are . . . amusing.
new_xl.opts = copy.deepcopy(old_xl.opts)
for sv in old_xl.subvols:
new_xl.subvols.append(copy_stack(sv, suffix, True))
# Patch up the path at the bottom.
if new_xl.type == "storage/posix":
new_xl.opts["directory"] += ("/" + suffix)
return new_xl
def cleanup (parent, graph):
if parent.type in good_xlators:
# Temporary fix so that HekaFS volumes can use the
# SSL-enabled multi-threaded socket transport.
if parent.type == "protocol/server":
parent.type = "protocol/server2"
parent.opts["transport-type"] = "ssl"
elif parent.type == "protocol/client":
parent.type = "protocol/client2"
parent.opts["transport-type"] = "ssl"
sv = []
for child in parent.subvols:
sv.append(cleanup(child, graph))
parent.subvols = sv
else:
parent = cleanup(parent.subvols[0], graph)
return parent
class Translator:
def __init__ (self, name):
self.name = name
self.type = ""
self.opts = {}
self.subvols = []
self.dumped = False
def __repr__ (self):
return "<Translator %s>" % self.name
def load (path):
# If it's a string, open it; otherwise, assume it's already a
# file-like object (most notably from urllib*).
if type(path) in (str,):
fp = file(path, "r")
else:
fp = path
all_xlators = {}
xlator = None
last_xlator = None
while True:
text = fp.readline()
if text == "":
break
text = text.split()
if not len(text):
continue
if text[0] == "volume":
if xlator:
raise RuntimeError("nested volume definition")
xlator = Translator(text[1])
continue
if not xlator:
raise RuntimeError("text outside volume definition")
if text[0] == "type":
xlator.type = text[1]
continue
if text[0] == "option":
xlator.opts[text[1]] = ''.join(text[2:])
continue
if text[0] == "subvolumes":
for sv in text[1:]:
xlator.subvols.append(all_xlators[sv])
continue
if text[0] == "end-volume":
all_xlators[xlator.name] = xlator
last_xlator = xlator
xlator = None
continue
raise RuntimeError("unrecognized keyword %s" % text[0])
if xlator:
raise RuntimeError("unclosed volume definition")
return all_xlators, last_xlator
def generate (graph, last, stream=sys.stdout):
for sv in last.subvols:
if not sv.dumped:
generate(graph, sv, stream)
print("", file=stream)
sv.dumped = True
print("volume %s" % last.name, file=stream)
print(" type %s" % last.type, file=stream)
for k, v in last.opts.items():
print(" option %s %s" % (k, v), file=stream)
if last.subvols:
print(" subvolumes %s" % ''.join(
[ sv.name for sv in last.subvols ]), file=stream)
print("end-volume", file=stream)
def push_filter (graph, old_xl, filt_type, opts={}):
suffix = "-" + old_xl.type.split("/")[1]
if len(old_xl.name) > len(suffix):
if old_xl.name[-len(suffix):] == suffix:
old_xl.name = old_xl.name[:-len(suffix)]
new_xl = Translator(old_xl.name+suffix)
new_xl.type = old_xl.type
new_xl.opts = old_xl.opts
new_xl.subvols = old_xl.subvols
graph[new_xl.name] = new_xl
old_xl.name += ("-" + filt_type.split("/")[1])
old_xl.type = filt_type
old_xl.opts = opts
old_xl.subvols = [new_xl]
graph[old_xl.name] = old_xl
def delete (graph, victim):
if len(victim.subvols) != 1:
raise RuntimeError("attempt to delete non-unary translator")
for xl in graph.itervalues():
while xl.subvols.count(victim):
i = xl.subvols.index(victim)
xl.subvols[i] = victim.subvols[0]
if __name__ == "__main__":
graph, last = load(sys.argv[1])
generate(graph, last)
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