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# Copyright 2022 Acme Gating, LLC
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
# Inspect ZK contents like zk-shell; handles compressed and sharded
# data.
import argparse
import pathlib
import cmd
import sys
import textwrap
import zlib
import kazoo.client
from kazoo.exceptions import NoNodeError
def resolve_path(path, rest):
newpath = path / rest
newparts = []
for part in newpath.parts:
if part == '.':
continue
elif part == '..':
newparts.pop()
else:
newparts.append(part)
return pathlib.PurePosixPath(*newparts)
class REPL(cmd.Cmd):
def __init__(self, args):
self.path = pathlib.PurePosixPath('/')
super().__init__()
kwargs = {}
if args.cert:
kwargs['use_ssl'] = True
kwargs['keyfile'] = args.key
kwargs['certfile'] = args.cert
kwargs['ca'] = args.ca
self.client = kazoo.client.KazooClient(args.host, **kwargs)
self.client.start()
@property
def prompt(self):
return f'{self.path}> '
def do_EOF(self, path):
sys.exit(0)
def do_ls(self, path):
'List znodes: ls [PATH]'
if path:
mypath = self.path / path
else:
mypath = self.path
try:
for child in self.client.get_children(str(mypath)):
print(child)
except NoNodeError:
print(f'No such node: {mypath}')
def do_cd(self, path):
'Change the working path: cd PATH'
if path:
newpath = resolve_path(self.path, path)
if self.client.exists(str(newpath)):
self.path = newpath
else:
print(f'No such node: {newpath}')
def do_pwd(self):
'Print the working path'
print(self.path)
def help_get(self):
print(textwrap.dedent(self.do_get.__doc__))
def do_get(self, args):
"""\
Get znode value: get PATH [-v]
-v: output metadata about the path
"""
args = args.split(' ')
path = args[0]
args = args[1:]
path = resolve_path(self.path, path)
try:
compressed_data, zstat = self.client.get(str(path))
except NoNodeError:
print(f'No such node: {path}')
return
was_compressed = False
try:
data = zlib.decompress(compressed_data)
was_compressed = True
except zlib.error:
data = compressed_data
if '-v' in args:
print(f'Compressed: {was_compressed}')
print(f'Size: {len(data)}')
print(f'Compressed size: {len(compressed_data)}')
print(f'Zstat: {zstat}')
print(data)
def help_unshard(self):
print(textwrap.dedent(self.do_unshard.__doc__))
def do_unshard(self, args):
"""\
Get the unsharded value: get PATH [-v]
-v: output metadata about the path
"""
args = args.split(' ')
path = args[0]
args = args[1:]
path = resolve_path(self.path, path)
try:
shards = sorted(self.client.get_children(str(path)))
except NoNodeError:
print(f'No such node: {path}')
return
compressed_data = b''
data = b''
for shard in shards:
d, _ = self.client.get(str(path / shard))
compressed_data += d
if compressed_data:
data = zlib.decompress(compressed_data)
if '-v' in args:
print(f'Size: {len(data)}')
print(f'Compressed size: {len(compressed_data)}')
print(data)
def do_rm(self, args):
'Delete znode: rm PATH [-r]'
args = args.split(' ')
path = args[0]
args = args[1:]
path = resolve_path(self.path, path)
if '-r' in args:
recursive = True
else:
recursive = False
try:
self.client.delete(str(path), recursive=recursive)
except NoNodeError:
print(f'No such node: {path}')
def main():
parser = argparse.ArgumentParser()
parser.add_argument('host', help='ZK host string')
parser.add_argument('--cert', help='Path to TLS certificate')
parser.add_argument('--key', help='Path to TLS key')
parser.add_argument('--ca', help='Path to TLS CA cert')
args = parser.parse_args()
repl = REPL(args)
repl.cmdloop()
if __name__ == '__main__':
main()
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