232 lines
10 KiB
Python
232 lines
10 KiB
Python
#
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# directory_extension.py
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#
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# This source file is part of the FoundationDB open source project
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#
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# Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import traceback
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import sys
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import fdb
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import fdb.directory_impl
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from fdb import six
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ops_that_create_dirs = [
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six.u('DIRECTORY_CREATE_SUBSPACE'),
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six.u('DIRECTORY_CREATE_LAYER'),
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six.u('DIRECTORY_CREATE_OR_OPEN'),
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six.u('DIRECTORY_CREATE'),
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six.u('DIRECTORY_OPEN'),
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six.u('DIRECTORY_MOVE'),
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six.u('DIRECTORY_MOVE_TO'),
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six.u('DIRECTORY_OPEN_SUBSPACE'),
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]
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log_all = False
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log_instructions = False
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log_ops = False
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log_dirs = False
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log_errors = False
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def log_op(msg, force=False):
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if log_ops or log_all or force:
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print(msg)
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class DirectoryExtension():
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def __init__(self):
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self.dir_list = [fdb.directory]
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self.dir_index = 0
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self.error_index = 0
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def pop_tuples(self, stack, num=None):
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actual_num = num
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if actual_num is None:
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actual_num = 1
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tuples = tuple([tuple(stack.pop(stack.pop())) for i in range(actual_num)])
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if num is None:
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return tuples[0]
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return tuples
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def append_dir(self, inst, dir):
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if log_dirs or log_all:
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print('pushed %s at %d (op=%s)' % (dir.__class__.__name__, len(self.dir_list), inst.op))
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self.dir_list.append(dir)
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def process_instruction(self, inst):
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try:
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if log_all or log_instructions:
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print("%d. %s" % (inst.index, inst.op))
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directory = self.dir_list[self.dir_index]
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if inst.op == six.u('DIRECTORY_CREATE_SUBSPACE'):
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path = self.pop_tuples(inst.stack)
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raw_prefix = inst.pop()
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log_op('created subspace at %r: %r' % (path, raw_prefix))
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self.append_dir(inst, fdb.Subspace(path, raw_prefix))
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elif inst.op == six.u('DIRECTORY_CREATE_LAYER'):
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index1, index2, allow_manual_prefixes = inst.pop(3)
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if self.dir_list[index1] is None or self.dir_list[index2] is None:
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log_op('create directory layer: None')
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self.append_dir(inst, None)
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else:
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log_op('create directory layer: node_subspace (%d) = %r, content_subspace (%d) = %r, allow_manual_prefixes = %d' %
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(index1, self.dir_list[index1].rawPrefix, index2, self.dir_list[index2].rawPrefix, allow_manual_prefixes))
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self.append_dir(inst, fdb.DirectoryLayer(self.dir_list[index1], self.dir_list[index2], allow_manual_prefixes == 1))
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elif inst.op == six.u('DIRECTORY_CHANGE'):
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self.dir_index = inst.pop()
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if not self.dir_list[self.dir_index]:
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self.dir_index = self.error_index
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if log_dirs or log_all:
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new_dir = self.dir_list[self.dir_index]
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clazz = new_dir.__class__.__name__
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new_path = repr(new_dir._path) if hasattr(new_dir, '_path') else "<na>"
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print('changed directory to %d (%s @%r)' % (self.dir_index, clazz, new_path))
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elif inst.op == six.u('DIRECTORY_SET_ERROR_INDEX'):
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self.error_index = inst.pop()
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elif inst.op == six.u('DIRECTORY_CREATE_OR_OPEN'):
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path = self.pop_tuples(inst.stack)
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layer = inst.pop()
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log_op('create_or_open %r: layer=%r' % (directory.get_path() + path, layer))
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d = directory.create_or_open(inst.tr, path, layer or b'')
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self.append_dir(inst, d)
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elif inst.op == six.u('DIRECTORY_CREATE'):
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path = self.pop_tuples(inst.stack)
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layer, prefix = inst.pop(2)
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log_op('create %r: layer=%r, prefix=%r' % (directory.get_path() + path, layer, prefix))
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self.append_dir(inst, directory.create(inst.tr, path, layer or b'', prefix))
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elif inst.op == six.u('DIRECTORY_OPEN'):
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path = self.pop_tuples(inst.stack)
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layer = inst.pop()
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log_op('open %r: layer=%r' % (directory.get_path() + path, layer))
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self.append_dir(inst, directory.open(inst.tr, path, layer or b''))
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elif inst.op == six.u('DIRECTORY_MOVE'):
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old_path, new_path = self.pop_tuples(inst.stack, 2)
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log_op('move %r to %r' % (directory.get_path() + old_path, directory.get_path() + new_path))
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self.append_dir(inst, directory.move(inst.tr, old_path, new_path))
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elif inst.op == six.u('DIRECTORY_MOVE_TO'):
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new_absolute_path = self.pop_tuples(inst.stack)
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log_op('move %r to %r' % (directory.get_path(), new_absolute_path))
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self.append_dir(inst, directory.move_to(inst.tr, new_absolute_path))
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elif inst.op == six.u('DIRECTORY_REMOVE'):
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count = inst.pop()
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if count == 0:
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log_op('remove %r' % (directory.get_path(),))
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directory.remove(inst.tr)
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else:
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path = self.pop_tuples(inst.stack)
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log_op('remove %r' % (directory.get_path() + path,))
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directory.remove(inst.tr, path)
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elif inst.op == six.u('DIRECTORY_REMOVE_IF_EXISTS'):
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count = inst.pop()
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if count == 0:
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log_op('remove_if_exists %r' % (directory.get_path(),))
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directory.remove_if_exists(inst.tr)
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else:
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path = self.pop_tuples(inst.stack)
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log_op('remove_if_exists %r' % (directory.get_path() + path,))
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directory.remove_if_exists(inst.tr, path)
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elif inst.op == six.u('DIRECTORY_LIST'):
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count = inst.pop()
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if count == 0:
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result = directory.list(inst.tr)
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log_op('list %r' % (directory.get_path(),))
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else:
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path = self.pop_tuples(inst.stack)
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result = directory.list(inst.tr, path)
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log_op('list %r' % (directory.get_path() + path,))
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inst.push(fdb.tuple.pack(tuple(result)))
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elif inst.op == six.u('DIRECTORY_EXISTS'):
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count = inst.pop()
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if count == 0:
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result = directory.exists(inst.tr)
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log_op('exists %r: %d' % (directory.get_path(), result))
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else:
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path = self.pop_tuples(inst.stack)
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result = directory.exists(inst.tr, path)
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log_op('exists %r: %d' % (directory.get_path() + path, result))
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if result:
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inst.push(1)
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else:
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inst.push(0)
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elif inst.op == six.u('DIRECTORY_PACK_KEY'):
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key_tuple = self.pop_tuples(inst.stack)
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inst.push(directory.pack(key_tuple))
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elif inst.op == six.u('DIRECTORY_UNPACK_KEY'):
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key = inst.pop()
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log_op('unpack %r in subspace with prefix %r' % (key, directory.rawPrefix))
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tup = directory.unpack(key)
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for t in tup:
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inst.push(t)
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elif inst.op == six.u('DIRECTORY_RANGE'):
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tup = self.pop_tuples(inst.stack)
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rng = directory.range(tup)
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inst.push(rng.start)
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inst.push(rng.stop)
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elif inst.op == six.u('DIRECTORY_CONTAINS'):
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key = inst.pop()
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result = directory.contains(key)
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if result:
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inst.push(1)
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else:
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inst.push(0)
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elif inst.op == six.u('DIRECTORY_OPEN_SUBSPACE'):
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path = self.pop_tuples(inst.stack)
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log_op('open_subspace %r (at %r)' % (path, directory.key()))
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self.append_dir(inst, directory.subspace(path))
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elif inst.op == six.u('DIRECTORY_LOG_SUBSPACE'):
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prefix = inst.pop()
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inst.tr[prefix + fdb.tuple.pack((self.dir_index,))] = directory.key()
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elif inst.op == six.u('DIRECTORY_LOG_DIRECTORY'):
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prefix = inst.pop()
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exists = directory.exists(inst.tr)
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if exists:
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children = tuple(directory.list(inst.tr))
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else:
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children = ()
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logSubspace = fdb.Subspace((self.dir_index,), prefix)
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inst.tr[logSubspace[six.u('path')]] = fdb.tuple.pack(directory.get_path())
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inst.tr[logSubspace[six.u('layer')]] = fdb.tuple.pack((directory.get_layer(),))
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inst.tr[logSubspace[six.u('exists')]] = fdb.tuple.pack((int(exists),))
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inst.tr[logSubspace[six.u('children')]] = fdb.tuple.pack(children)
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elif inst.op == six.u('DIRECTORY_STRIP_PREFIX'):
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s = inst.pop()
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if not s.startswith(directory.key()):
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raise Exception('String %r does not start with raw prefix %r' % (s, directory.key()))
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inst.push(s[len(directory.key()):])
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else:
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raise Exception('Unknown op: %s' % inst.op)
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except Exception as e:
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if log_all or log_errors:
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print(e)
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# traceback.print_exc(file=sys.stdout)
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if inst.op in ops_that_create_dirs:
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self.append_dir(inst, None)
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inst.push(b'DIRECTORY_ERROR')
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