/
command.py
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/
command.py
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# vim: set fileencodings=utf-8
# -*- coding: utf-8; -*-
# PYTHON_ARGCOMPLETE_OK
#
# Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
# license agreements. See the NOTICE file distributed with this work for
# additional information regarding copyright ownership. Crate licenses
# this file to you 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.
#
# However, if you have executed another commercial license agreement
# with Crate these terms will supersede the license and you may use the
# software solely pursuant to the terms of the relevant commercial agreement.
from __future__ import print_function
import logging
import os
import re
import sys
import urllib3
from appdirs import user_data_dir, user_config_dir
from argparse import ArgumentParser
from collections import namedtuple
from crate.client import connect
from crate.client.exceptions import ConnectionError, ProgrammingError
from distutils.version import StrictVersion
from urllib3.exceptions import LocationParseError
from .commands import built_in_commands, Command
from .config import Configuration, ConfigurationError
from .outputs import OutputWriter
from .printer import ColorPrinter, PrintWrapper
from .sysinfo import SysInfoCommand
from ..crash import __version__ as crash_version
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
try:
from logging import NullHandler
except ImportError:
from logging import Handler
class NullHandler(Handler):
def emit(self, record):
pass
logging.getLogger('crate').addHandler(NullHandler())
USER_DATA_DIR = user_data_dir("Crate", "Crate")
HISTORY_FILE_NAME = 'crash_history'
HISTORY_PATH = os.path.join(USER_DATA_DIR, HISTORY_FILE_NAME)
USER_CONFIG_DIR = user_config_dir("Crate", "Crate")
CONFIG_FILE_NAME = 'crash.cfg'
CONFIG_PATH = os.path.join(USER_CONFIG_DIR, CONFIG_FILE_NAME)
Result = namedtuple('Result', ['cols',
'rows',
'rowcount',
'duration',
'output_width'])
TABLE_SCHEMA_MIN_VERSION = StrictVersion("0.57.0")
def parse_config_path(args=sys.argv):
"""
Preprocess sys.argv and extract --config argument.
"""
config = CONFIG_PATH
if '--config' in args:
idx = args.index('--config')
if len(args) > idx + 1:
config = args.pop(idx + 1)
_ = args.pop(idx)
return config
def parse_args(parser):
"""
Parse sys.argv arguments with given parser
"""
try:
import argcomplete
argcomplete.autocomplete(parser)
except ImportError:
pass
return parser.parse_args()
def boolean(v):
if str(v).lower() in ("yes", "true", "t", "1"):
return True
elif str(v).lower() in ("no", "false", "f", "0"):
return False
else:
raise ValueError('not a boolean value')
def get_parser(output_formats=[], conf=None):
"""
Create an argument parser that reads default values from a
configuration file if provided.
"""
def _conf_or_default(key, value):
return value if conf is None else conf.get_or_set(key, value)
parser = ArgumentParser(description='crate shell')
parser.add_argument('-v', '--verbose', action='count',
dest='verbose', default=_conf_or_default('verbosity', 0),
help='use -v to get debug output')
parser.add_argument('-A', '--no-autocomplete', action='store_false',
dest='autocomplete',
default=_conf_or_default('autocomplete', True),
help='use -A to disable SQL autocompletion')
parser.add_argument('-a', '--autocapitalize', action='store_true',
dest='autocapitalize',
default=False,
help='use -a to enable experimental auto-capitalization of SQL keywords')
parser.add_argument('-U', '--username', type=str,
help='the username to authenticate in the database')
parser.add_argument('--history', type=str,
help='the history file to use', default=HISTORY_PATH)
parser.add_argument('--config', type=str,
help='the configuration file to use', default=CONFIG_PATH)
group = parser.add_mutually_exclusive_group()
group.add_argument('-c', '--command', type=str,
help='execute sql statement')
group.add_argument('--sysinfo', action='store_true', default=False,
help='show system information')
parser.add_argument('--hosts', type=str, nargs='*',
default=_conf_or_default('hosts', ['localhost:4200']),
help='the crate hosts to connect to', metavar='HOST')
parser.add_argument('--verify-ssl', type=boolean, default=True,
help='force verification of the SSL certificate of the server')
parser.add_argument('--cert-file', type=file_with_permissions,
help='path to the client certificate file')
parser.add_argument('--key-file', type=file_with_permissions,
help='path to the key file of the client certificate')
parser.add_argument('--ca-cert-file', type=file_with_permissions,
help='path to the CA certificate file')
parser.add_argument('--format', type=str,
default=_conf_or_default('format', 'tabular'),
choices=output_formats,
help='output format of the sql response', metavar='FORMAT')
parser.add_argument('--version', action='store_true', default=False,
help='show crash version and exit')
return parser
def noargs_command(fn):
def inner_fn(self, *args):
if len(args):
self.logger.critical("Command does not take any arguments.")
return
return fn(self, *args)
inner_fn.__doc__ = fn.__doc__
return inner_fn
class CrateCmd(object):
def __init__(self,
output_writer=None,
connection=None,
error_trace=False,
is_tty=True,
autocomplete=True,
autocapitalize=True,
verify_ssl=True,
cert_file=None,
key_file=None,
ca_cert_file=None,
username=None):
self.error_trace = error_trace
self.connection = connection or connect(error_trace=error_trace)
self.cursor = self.connection.cursor()
self.output_writer = output_writer or OutputWriter(
PrintWrapper(), is_tty)
self.lines = []
self.exit_code = 0
self.expanded_mode = False
self.sys_info_cmd = SysInfoCommand(self)
self.commands = {
'q': self._quit,
'c': self._connect,
'connect': self._connect,
'dt': self._show_tables,
'sysinfo': self.sys_info_cmd.execute,
}
self.commands.update(built_in_commands)
self.logger = ColorPrinter(is_tty)
self._autocomplete = autocomplete
self._autocapitalize = autocapitalize
self.username = username
self.verify_ssl = verify_ssl
self.cert_file = cert_file
self.key_file = key_file
self.ca_cert_file = ca_cert_file
def get_num_columns(self):
return 80
def should_autocomplete(self):
return self._autocomplete
def should_autocapitalize(self):
return self._autocapitalize
def pprint(self, rows, cols):
result = Result(cols,
rows,
self.cursor.rowcount,
self.cursor.duration,
self.get_num_columns())
self.output_writer.write(result)
def process(self, text):
if text.lstrip().startswith('--'):
return
text = text.rstrip()
if text.startswith('\\') and not self.lines:
self._try_exec_cmd(text.lstrip('\\'))
elif text.endswith(';'):
line = text.rstrip(';')
if self.lines:
self.lines.append(line)
line = ' '.join(self.lines)
self._exec(line)
self.lines[:] = []
else:
self._exec(line)
elif text:
self.lines.append(text)
def exit(self):
if self.lines:
self._exec(' '.join(self.lines))
self.lines[:] = []
@noargs_command
def _show_tables(self, *args):
""" print the existing tables within the 'doc' schema """
schema_name = \
"table_schema" if self.connection.lowest_server_version \
>= TABLE_SCHEMA_MIN_VERSION else "schema_name"
self._exec("select format('%s.%s', {schema}, table_name) as name "
"from information_schema.tables "
"where {schema} not in ('sys','information_schema', 'pg_catalog')"
.format(schema=schema_name))
@noargs_command
def _quit(self, *args):
""" quit crash """
self.logger.warn(u'Bye!')
sys.exit(self.exit_code)
def is_conn_avaliable(self):
if self.connection.lowest_server_version == StrictVersion("0.0.0"):
return False
else:
return True
def _do_connect(self):
self.connection = connect(servers=self.last_connected_servers, error_trace=self.error_trace,
verify_ssl_cert=self.verify_ssl, cert_file=self.cert_file, key_file=self.key_file,
ca_cert=self.ca_cert_file, username=self.username)
self.cursor = self.connection.cursor()
def _connect(self, server):
""" connect to the given server, e.g.: \connect localhost:4200 """
self.last_connected_servers = server
self._do_connect()
results = []
failed = 0
client = self.connection.client
for server in client.active_servers:
try:
infos = client.server_infos(server)
except ConnectionError as e:
failed += 1
results.append([server, None, '0.0.0', False, e.message])
else:
results.append(infos + (True, 'OK', ))
self.pprint(results,
['server_url', 'node_name', 'version', 'connected', 'message'])
if failed == len(results):
self.logger.critical('CONNECT ERROR')
else:
# Execute cluster/node checks only in verbose mode
if self.error_trace:
self.logger.info('CONNECT OK')
SysInfoCommand.CLUSTER_INFO['information_schema_query'] = \
get_information_schema_query(self.connection.lowest_server_version)
# check for failing node and cluster checks
built_in_commands['check'](self, startup=True)
def _try_exec_cmd(self, line):
words = line.split(' ', 1)
if not words or not words[0]:
return False
cmd = self.commands.get(words[0].lower().rstrip(';'))
if len(words) > 1:
words[1] = words[1].rstrip(';')
if cmd:
try:
if isinstance(cmd, Command):
message = cmd(self, *words[1:])
else:
message = cmd(*words[1:])
except TypeError as e:
self.logger.critical(getattr(e, 'message', None) or repr(e))
doc = cmd.__doc__
if doc and not doc.isspace():
self.logger.info('help: {0}'.format(words[0].lower()))
self.logger.info(cmd.__doc__)
except Exception as e:
self.logger.critical(getattr(e, 'message', None) or repr(e))
else:
if message:
self.logger.info(message)
return True
else:
self.logger.critical(
'Unknown command. Type \? for a full list of available commands.')
return False
def _exec(self, line):
success = self.execute(line)
self.exit_code = self.exit_code or int(not success)
def _execute(self, statement):
try:
self.cursor.execute(statement)
return True
except ConnectionError as e:
if self.error_trace:
self.logger.warn(str(e))
self.logger.warn(
'Use \connect <server> to connect to one or more servers first.')
except ProgrammingError as e:
self.logger.critical(e.message)
if self.error_trace and e.error_trace:
self.logger.critical('\n' + e.error_trace)
return False
def execute(self, statement):
success = self._execute(statement)
if not success:
return False
cur = self.cursor
duration = ''
if cur.duration > -1:
duration = ' ({0:.3f} sec)'.format(float(cur.duration) / 1000.0)
print_vars = {
'command': stmt_type(statement),
'rowcount': cur.rowcount,
's': 's'[cur.rowcount == 1:],
'duration': duration
}
if cur.description:
self.pprint(cur.fetchall(), [c[0] for c in cur.description])
tmpl = '{command} {rowcount} row{s} in set{duration}'
else:
tmpl = '{command} OK, {rowcount} row{s} affected {duration}'
self.logger.info(tmpl.format(**print_vars))
return True
def stmt_type(statement):
"""
Extract type of statement, e.g. SELECT, INSERT, UPDATE, DELETE, ...
"""
return re.findall('[\w]+', statement)[0].upper()
def get_stdin():
"""
Get data from stdin, if any
"""
if not sys.stdin.isatty():
for line in sys.stdin:
yield line
return
def host_and_port(host_or_port):
"""
Return full hostname/IP + port, possible input formats are:
* host:port -> host:port
* : -> localhost:4200
* :port -> localhost:port
* host -> host:4200
"""
if ':' in host_or_port:
if len(host_or_port) == 1:
return 'localhost:4200'
elif host_or_port.startswith(':'):
return 'localhost' + host_or_port
return host_or_port
return host_or_port + ':4200'
def get_information_schema_query(lowest_server_version):
schema_name = \
"table_schema" if lowest_server_version >= \
TABLE_SCHEMA_MIN_VERSION else "schema_name"
information_schema_query = \
""" select count(distinct(table_name))
as number_of_tables
from information_schema.tables
where {schema}
not in ('information_schema', 'sys', 'pg_catalog') """
return information_schema_query.format(schema=schema_name)
def main():
is_tty = sys.stdout.isatty()
printer = ColorPrinter(is_tty)
output_writer = OutputWriter(PrintWrapper(), is_tty)
config = parse_config_path()
conf = None
try:
conf = Configuration(config)
except ConfigurationError as e:
printer.warn(str(e))
parser = get_parser(output_writer.formats)
parser.print_usage()
sys.exit(1)
parser = get_parser(output_writer.formats, conf=conf)
try:
args = parse_args(parser)
except Exception as e:
printer.warn(str(e))
sys.exit(1)
output_writer.output_format = args.format
if args.version:
printer.info(crash_version)
sys.exit(0)
crate_hosts = [host_and_port(h) for h in args.hosts]
error_trace = args.verbose > 0
try:
cmd = _create_cmd(crate_hosts, error_trace, output_writer, is_tty, args)
except (ProgrammingError, LocationParseError) as e:
printer.warn(str(e))
sys.exit(1)
cmd._connect(crate_hosts)
done = False
stdin_data = get_stdin()
if args.sysinfo:
cmd.output_writer.output_format = 'mixed'
cmd.sys_info_cmd.execute()
done = True
if args.command:
cmd.process(args.command)
done = True
elif stdin_data:
for data in stdin_data:
cmd.process(data)
done = True
if not done:
from .repl import loop
loop(cmd, args.history)
conf.save()
cmd.exit()
sys.exit(cmd.exit_code)
def _create_cmd(crate_hosts, error_trace, output_writer, is_tty, args, timeout=None):
conn = connect(crate_hosts,
verify_ssl_cert=args.verify_ssl,
cert_file=args.cert_file,
key_file=args.key_file,
ca_cert=args.ca_cert_file,
username=args.username,
timeout=timeout)
return CrateCmd(connection=conn,
error_trace=error_trace,
output_writer=output_writer,
is_tty=is_tty,
autocomplete=args.autocomplete,
autocapitalize=args.autocapitalize,
verify_ssl=args.verify_ssl,
cert_file=args.cert_file,
key_file=args.key_file,
ca_cert_file=args.ca_cert_file,
username=args.username)
def file_with_permissions(path):
open(path, 'r').close()
return path
if __name__ == '__main__':
main()