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import argparse
import sys
from pathlib import Path
from typing import List, Optional, Tuple, Type
from knot_resolver.client.command import Command, CommandArgs, CompWords, register_command
from knot_resolver.datamodel import KresConfig
from knot_resolver.datamodel.globals import Context, reset_global_validation_context, set_global_validation_context
from knot_resolver.utils.modeling import try_to_parse
from knot_resolver.utils.modeling.exceptions import DataParsingError, DataValidationError
@register_command
class ConvertCommand(Command):
def __init__(self, namespace: argparse.Namespace) -> None:
super().__init__(namespace)
self.input_file: str = namespace.input_file
self.output_file: Optional[str] = namespace.output_file
self.strict: bool = namespace.strict
self.type: str = namespace.type
@staticmethod
def register_args_subparser(
subparser: "argparse._SubParsersAction[argparse.ArgumentParser]",
) -> Tuple[argparse.ArgumentParser, "Type[Command]"]:
convert = subparser.add_parser("convert", help="Converts JSON or YAML configuration to Lua script.")
convert.set_defaults(strict=True)
convert.add_argument(
"--no-strict",
help="Ignore strict rules during validation, e.g. path/file existence.",
action="store_false",
dest="strict",
)
convert.add_argument(
"--type", help="The type of Lua script to generate", choices=["worker", "policy-loader"], default="worker"
)
convert.add_argument(
"input_file",
type=str,
help="File with configuration in YAML or JSON format.",
)
convert.add_argument(
"output_file",
type=str,
nargs="?",
help="Optional, output file for converted configuration in Lua script. If not specified, converted configuration is printed.",
default=None,
)
return convert, ConvertCommand
@staticmethod
def completion(args: List[str], parser: argparse.ArgumentParser) -> CompWords:
return {}
def run(self, args: CommandArgs) -> None:
with open(self.input_file, "r") as f:
data = f.read()
try:
parsed = try_to_parse(data)
set_global_validation_context(Context(Path(Path(self.input_file).parent), self.strict))
if self.type == "worker":
lua = KresConfig(parsed).render_lua()
elif self.type == "policy-loader":
lua = KresConfig(parsed).render_lua_policy()
else:
raise ValueError(f"Invalid self.type={self.type}")
reset_global_validation_context()
except (DataParsingError, DataValidationError) as e:
print(e, file=sys.stderr)
sys.exit(1)
if self.output_file:
with open(self.output_file, "w") as f:
f.write(lua)
else:
print(lua)
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