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import argparse
import sys
from enum import Enum
from typing import List, Literal, Optional, Tuple, Type
from knot_resolver.client.command import COMP_NOSPACE, Command, CommandArgs, CompWords, comp_get_words, register_command
from knot_resolver.datamodel import KresConfig
from knot_resolver.utils.modeling.parsing import DataFormat, parse_json, try_to_parse
from knot_resolver.utils.requests import request
class Operations(Enum):
SET = 0
DELETE = 1
GET = 2
def operation_to_method(operation: Operations) -> Literal["PUT", "GET", "DELETE"]:
if operation == Operations.SET:
return "PUT"
if operation == Operations.DELETE:
return "DELETE"
return "GET"
@register_command
class ConfigCommand(Command):
def __init__(self, namespace: argparse.Namespace) -> None:
super().__init__(namespace)
self.path: str = str(namespace.path) if hasattr(namespace, "path") else ""
self.format: DataFormat = namespace.format if hasattr(namespace, "format") else DataFormat.JSON
self.operation: Optional[Operations] = namespace.operation if hasattr(namespace, "operation") else None
self.file: Optional[str] = namespace.file if hasattr(namespace, "file") else None
@staticmethod
def register_args_subparser(
subparser: "argparse._SubParsersAction[argparse.ArgumentParser]",
) -> Tuple[argparse.ArgumentParser, "Type[Command]"]:
config = subparser.add_parser("config", help="Performs operations on the running resolver's configuration.")
path_help = "Optional, path (JSON pointer, RFC6901) to the configuration resources. By default, the entire configuration is selected."
config_subparsers = config.add_subparsers(help="operation type")
# GET operation
get_op = config_subparsers.add_parser("get", help="Get current configuration from the resolver.")
get_op.set_defaults(operation=Operations.GET, format=DataFormat.YAML)
get_op.add_argument(
"-p",
"--path",
help=path_help,
action="store",
type=str,
default="",
)
get_op.add_argument(
"file",
help="Optional, path to the file where to save exported configuration data. If not specified, data will be printed.",
type=str,
nargs="?",
)
get_formats = get_op.add_mutually_exclusive_group()
get_formats.add_argument(
"--json",
help="Get configuration data in JSON format.",
const=DataFormat.JSON,
action="store_const",
dest="format",
)
get_formats.add_argument(
"--yaml",
help="Get configuration data in YAML format, default.",
const=DataFormat.YAML,
action="store_const",
dest="format",
)
# SET operation
set_op = config_subparsers.add_parser("set", help="Set new configuration for the resolver.")
set_op.set_defaults(operation=Operations.SET)
set_op.add_argument(
"-p",
"--path",
help=path_help,
action="store",
type=str,
default="",
)
value_or_file = set_op.add_mutually_exclusive_group()
value_or_file.add_argument(
"file",
help="Optional, path to file with new configuration.",
type=str,
nargs="?",
)
value_or_file.add_argument(
"value",
help="Optional, new configuration value.",
type=str,
nargs="?",
)
# DELETE operation
delete_op = config_subparsers.add_parser(
"delete", help="Delete given configuration property or list item at the given index."
)
delete_op.set_defaults(operation=Operations.DELETE)
delete_op.add_argument(
"-p",
"--path",
help=path_help,
action="store",
type=str,
default="",
)
return config, ConfigCommand
@staticmethod
def completion(args: List[str], parser: argparse.ArgumentParser) -> CompWords:
nargs = len(args)
if nargs > 1 and args[-2] in ["-p", "--path"]:
words: CompWords = {}
words[COMP_NOSPACE] = None
path = args[-1]
path_nodes = path.split("/")
prefix = ""
properties = KresConfig.json_schema()["properties"]
is_list = False
for i, node in enumerate(path_nodes):
# first node is empty string
if i == 0:
continue
if node in properties:
is_list = False
if "properties" in properties[node]:
properties = properties[node]["properties"]
prefix += f"/{node}"
continue
if "items" in properties[node]:
properties = properties[node]["items"]["properties"]
prefix += f"/{node}"
is_list = True
continue
break
if is_list and node.isnumeric():
prefix += f"/{node}"
continue
for key in properties.keys():
words[f"{prefix}/{key}"] = properties[key]["description"]
return words
return comp_get_words(args, parser)
def run(self, args: CommandArgs) -> None:
if not self.operation:
args.subparser.print_help()
sys.exit()
new_config = None
path = f"v1/config{self.path}"
method = operation_to_method(self.operation)
if self.operation == Operations.SET:
if self.file:
try:
with open(self.file, "r") as f:
new_config = f.read()
except FileNotFoundError:
new_config = self.file
else:
# use STDIN also when file is not specified
new_config = input("Type new configuration: ")
body = DataFormat.JSON.dict_dump(try_to_parse(new_config)) if new_config else None
response = request(args.socket, method, path, body)
if response.status != 200:
print(response, file=sys.stderr)
sys.exit(1)
if self.operation == Operations.GET and self.file:
with open(self.file, "w") as f:
f.write(self.format.dict_dump(parse_json(response.body), indent=4))
print(f"saved to: {self.file}")
elif response.body:
print(self.format.dict_dump(parse_json(response.body), indent=4))
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