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main.py
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main.py
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"""Get and set DCOS CLI configuration properties
Usage:
dcos config --info
dcos config append <name> <value>
dcos config prepend <name> <value>
dcos config set <name> <value>
dcos config show [<name>]
dcos config unset [--index=<index>] <name>
dcos config validate
Options:
-h, --help Show this screen
--info Show a short description of this subcommand
--version Show version
--index=<index> Index into the list. The first element in the list has an
index of zero
Positional Arguments:
<name> The name of the property
<value> The value of the property
"""
import collections
import copy
import json
import os
import dcoscli
import docopt
import pkg_resources
import six
import toml
from dcos import (cmds, config, constants, emitting, http, jsonitem,
subcommand, util)
from dcos.errors import DCOSException
from dcoscli import analytics
emitter = emitting.FlatEmitter()
def main():
try:
return _main()
except DCOSException as e:
emitter.publish(e)
return 1
def _main():
util.configure_logger_from_environ()
args = docopt.docopt(
__doc__,
version='dcos-config version {}'.format(dcoscli.version))
http.silence_requests_warnings()
return cmds.execute(_cmds(), args)
def compare_validations(toml_config_pre, toml_config_post):
"""
:param toml_config_pre: dictionary for the value before change
:type toml_config_pre: dcos.api.config.Toml
:param toml_config_post: dictionary for the value with change
:type toml_config_post: dcos.api.config.Toml
:returns: process status
:rtype: int
"""
errors_pre = util.validate_json(toml_config_pre._dictionary,
_generate_root_schema(toml_config_pre))
errors_post = util.validate_json(toml_config_post._dictionary,
_generate_root_schema(toml_config_post))
if len(errors_post) != 0:
if len(errors_pre) == 0:
raise DCOSException(util.list_to_err(errors_post))
def _errs(errs):
return set([e.split('\n')[0] for e in errs])
diff_errors = _errs(errors_post) - _errs(errors_pre)
if len(diff_errors) != 0:
raise DCOSException(util.list_to_err(errors_post))
def _cmds():
"""
:returns: all the supported commands
:rtype: list of dcos.cmds.Command
"""
return [
cmds.Command(
hierarchy=['config', 'set'],
arg_keys=['<name>', '<value>'],
function=_set),
cmds.Command(
hierarchy=['config', 'append'],
arg_keys=['<name>', '<value>'],
function=_append),
cmds.Command(
hierarchy=['config', 'prepend'],
arg_keys=['<name>', '<value>'],
function=_prepend),
cmds.Command(
hierarchy=['config', 'unset'],
arg_keys=['<name>', '--index'],
function=_unset),
cmds.Command(
hierarchy=['config', 'show'],
arg_keys=['<name>'],
function=_show),
cmds.Command(
hierarchy=['config', 'validate'],
arg_keys=[],
function=_validate),
cmds.Command(
hierarchy=['config'],
arg_keys=['--info'],
function=_info),
]
def _info(info):
"""
:param info: Whether to output a description of this subcommand
:type info: boolean
:returns: process status
:rtype: int
"""
emitter.publish(__doc__.split('\n')[0])
return 0
def _set(name, value):
"""
:returns: process status
:rtype: int
"""
config_path, toml_config = _load_config()
section, subkey = _split_key(name)
config_schema = _get_config_schema(section)
python_value = jsonitem.parse_json_value(subkey, value, config_schema)
toml_config_pre = copy.deepcopy(toml_config)
if section not in toml_config_pre._dictionary:
toml_config_pre._dictionary[section] = {}
toml_config[name] = python_value
if (name == 'core.reporting' and python_value is True) or \
(name == 'core.email'):
analytics.segment_identify(toml_config)
_save_config_file(config_path, toml_config)
compare_validations(toml_config_pre, toml_config)
_save_config_file(config_path, toml_config)
return 0
def _append(name, value):
"""
:returns: process status
:rtype: int
"""
config_path, toml_config = _load_config()
python_value = _parse_array_item(name, value)
toml_config_pre = copy.deepcopy(toml_config)
section = name.split(".", 1)[0]
if section not in toml_config_pre._dictionary:
toml_config_pre._dictionary[section] = {}
toml_config[name] = toml_config.get(name, []) + python_value
compare_validations(toml_config_pre, toml_config)
_save_config_file(config_path, toml_config)
return 0
def _prepend(name, value):
"""
:returns: process status
:rtype: int
"""
config_path, toml_config = _load_config()
python_value = _parse_array_item(name, value)
toml_config_pre = copy.deepcopy(toml_config)
section = name.split(".", 1)[0]
if section not in toml_config_pre._dictionary:
toml_config_pre._dictionary[section] = {}
toml_config[name] = python_value + toml_config.get(name, [])
compare_validations(toml_config_pre, toml_config)
_save_config_file(config_path, toml_config)
return 0
def _unset(name, index):
"""
:returns: process status
:rtype: int
"""
config_path, toml_config = _load_config()
toml_config_pre = copy.deepcopy(toml_config)
section = name.split(".", 1)[0]
if section not in toml_config_pre._dictionary:
toml_config_pre._dictionary[section] = {}
value = toml_config.pop(name, None)
if value is None:
raise DCOSException("Property {!r} doesn't exist".format(name))
elif isinstance(value, collections.Mapping):
raise DCOSException(_generate_choice_msg(name, value))
elif (isinstance(value, collections.Sequence) and
not isinstance(value, six.string_types)):
if index is not None:
index = util.parse_int(index)
if index < 0 or index >= len(value):
raise DCOSException(
'Index ({}) is out of bounds - possible values are '
'between {} and {}'.format(index, 0, len(value) - 1))
value.pop(index)
toml_config[name] = value
elif index is not None:
raise DCOSException(
'Unsetting based on an index is only supported for lists')
compare_validations(toml_config_pre, toml_config)
_save_config_file(config_path, toml_config)
return 0
def _show(name):
"""
:returns: process status
:rtype: int
"""
_, toml_config = _load_config()
if name is not None:
value = toml_config.get(name)
if value is None:
raise DCOSException("Property {!r} doesn't exist".format(name))
elif isinstance(value, collections.Mapping):
raise DCOSException(_generate_choice_msg(name, value))
else:
emitter.publish(value)
else:
# Let's list all of the values
for key, value in sorted(toml_config.property_items()):
emitter.publish('{}={}'.format(key, value))
return 0
def _validate():
"""
:returns: process status
:rtype: int
"""
_, toml_config = _load_config()
errs = util.validate_json(toml_config._dictionary,
_generate_root_schema(toml_config))
if len(errs) != 0:
emitter.publish(util.list_to_err(errs))
return 1
return 0
def _generate_root_schema(toml_config):
"""
:param toml_configs: dictionary of values
:type toml_config: TomlConfig
:returns: configuration_schema
:rtype: jsonschema
"""
root_schema = {
'$schema': 'http://json-schema.org/schema#',
'type': 'object',
'properties': {},
'additionalProperties': False,
}
# Load the config schema from all the subsections into the root schema
for section in toml_config.keys():
config_schema = _get_config_schema(section)
root_schema['properties'][section] = config_schema
return root_schema
def _generate_choice_msg(name, value):
"""
:param name: name of the property
:type name: str
:param value: dictionary for the value
:type value: dcos.config.Toml
:returns: an error message for top level properties
:rtype: str
"""
message = ("Property {!r} doesn't fully specify a value - "
"possible properties are:").format(name)
for key, _ in sorted(value.property_items()):
message += '\n{}.{}'.format(name, key)
return message
def _load_config():
"""
:returns: process status
:rtype: int
"""
config_path = os.environ[constants.DCOS_CONFIG_ENV]
return (config_path, config.mutable_load_from_path(config_path))
def _save_config_file(config_path, toml_config):
"""
:param config_path: path to configuration file.
:type config_path: str
:param toml_config: TOML configuration object
:type toml_config: MutableToml or Toml
"""
serial = toml.dumps(toml_config._dictionary)
with open(config_path, 'w') as config_file:
config_file.write(serial)
def _get_config_schema(command):
"""
:param command: the subcommand name
:type command: str
:returns: the subcommand's configuration schema
:rtype: dict
"""
# core.* config variables are special. They're valid, but don't
# correspond to any particular subcommand, so we must handle them
# separately.
if command == "core":
return json.loads(
pkg_resources.resource_string(
'dcoscli',
'data/config-schema/core.json').decode('utf-8'))
executable = subcommand.command_executables(command, util.dcos_path())
return subcommand.config_schema(executable)
def _split_key(name):
"""
:param name: the full property path - e.g. marathon.host
:type name: str
:returns: the section and property name
:rtype: (str, str)
"""
terms = name.split('.', 1)
if len(terms) != 2:
raise DCOSException('Property name must have both a section and '
'key: <section>.<key> - E.g. marathon.host')
return (terms[0], terms[1])
def _parse_array_item(name, value):
"""
:param name: the name of the property
:type name: str
:param value: the value to parse
:type value: str
:returns: the parsed value as an array with one element
:rtype: (list of any, dcos.errors.Error) where any is string, int,
float, bool, array or dict
"""
section, subkey = _split_key(name)
config_schema = _get_config_schema(section)
parser = jsonitem.find_parser(subkey, config_schema)
if parser.schema['type'] != 'array':
raise DCOSException(
"Append/Prepend not supported on '{0}' properties - use 'dcos "
"config set {0} {1}'".format(name, value))
if ('items' in parser.schema and
parser.schema['items']['type'] == 'string'):
value = '["' + value + '"]'
else:
# We are going to assume that wrapping it in an array is enough
value = '[' + value + ']'
return parser(value)