import subprocess
import sys
from os import PathLike
from pathlib import Path
from typing import Any, Mapping, Optional, Union
from pyhocon import ConfigFactory
from pyhocon.config_tree import ConfigTree
from pyhocon.converter import HOCONConverter
from koapy.utils.platform import is_32bit, is_64bit
# Type alias for config object
# Paths related to default config file
# bundled with this package for fallback
[docs]default_config_filename = "config.conf"
[docs]default_config_file_directory = Path(__file__).parent
[docs]default_config_filepath = default_config_file_directory / default_config_filename
# Paths related to user config file
# for use customization
[docs]current_working_directory = Path.cwd()
[docs]home_directory = Path.home()
[docs]default_user_config_filename = "koapy.conf"
[docs]user_config_filename_cadidates = [
default_user_config_filename,
"." + default_user_config_filename,
]
[docs]default_user_config_filepath = home_directory / default_user_config_filename
# Default encoding for all file read/writes across this package
[docs]default_encoding = "utf-8"
# Function for reading configs
[docs]def read_config(
filename: Optional[Union[PathLike, str]] = None,
encoding: Optional[str] = None,
) -> Config:
if filename is None:
filename = default_user_config_filepath
if isinstance(filename, str):
filename = Path(filename)
if encoding is None:
encoding = default_encoding
# pylint: disable=redefined-outer-name
config = ConfigFactory.parse_file(filename, encoding=encoding)
return config
# Function for create configs from dict
[docs]def config_from_dict(dictionary: Mapping[str, Any]) -> Config:
# pylint: disable=redefined-outer-name
config = ConfigFactory.from_dict(dictionary)
return config
# Load default config bundled with this package for fallback
[docs]default_config = read_config(default_config_filepath)
# Try to read user config file from candidate paths
# 1. Starting from current directory, search for a user config file until reaching the root directory, with specific name patterns
# 2. In terms of user config filename pattern, visible filename takes precedence to hidden filename (hidden that starts with a dot)
# 3. If fails to find a user config file even in the root directory, finally check user home directory for a user config file
# Search for a user config file in a given directory
[docs]def find_user_config_file_in(
searching_directory: Optional[Union[PathLike, str]] = None,
) -> Optional[Path]:
if searching_directory is None:
# pylint: disable=redefined-outer-name
current_working_directory = Path.cwd()
searching_directory = current_working_directory
searching_directory_path = Path(searching_directory).resolve()
for config_filename in user_config_filename_cadidates:
config_filepath = searching_directory_path / config_filename
if config_filepath.exists():
return config_filepath
# Search for a user config file from a given directory to the root directory
[docs]def find_user_config_file_from(
starting_directory: Optional[Union[PathLike, str]] = None,
) -> Optional[Path]:
if starting_directory is None:
# pylint: disable=redefined-outer-name
current_working_directory = Path.cwd()
starting_directory = current_working_directory
searching_directory_path = Path(starting_directory).resolve()
should_stop = False
while not should_stop:
config_filepath = find_user_config_file_in(searching_directory_path)
if config_filepath:
return config_filepath
has_no_more_parent = (
str(searching_directory_path) == searching_directory_path.anchor
)
should_stop = has_no_more_parent
searching_directory_path = searching_directory_path.parent
# Empty config for internal usage
[docs]empty_config = config_from_dict({})
# Prepare user config before reading actual user config file (which may not exist)
[docs]user_config = empty_config
# Main config object for general use
# User config takes precedence and fallbacks to default config for missing entries
[docs]config = user_config.with_fallback(default_config)
# Helper function for updating `user_config`, mostly for internal use
# This also consequently updates `config` global variable
[docs]def set_user_config(c: Config) -> Config:
global user_config # pylint: disable=global-statement
global config # pylint: disable=global-statement
user_config = c
config = user_config.with_fallback(default_config)
return user_config
# Function for config initialization
[docs]def initialize_config_from_given_path(
filename: Optional[Union[PathLike, str]] = None
) -> bool:
user_config_filepath: Optional[PathLike] = None
initialized = False
# Use given filepath if possible
if not user_config_filepath:
if filename:
filepath = Path(filename).resolve()
if filepath.exists():
user_config_filepath = filepath
if user_config_filepath:
# pylint: disable=redefined-outer-name
user_config = read_config(user_config_filepath)
set_user_config(user_config)
initialized = True
return initialized
# Function for config initialization
[docs]def initialize_config_from_expected_paths() -> bool:
user_config_filepath: Optional[PathLike] = None
initialized = False
# Try searching starting from current directory to root
if not user_config_filepath:
user_config_filepath = find_user_config_file_from(current_working_directory)
# Try searching in home directory
if not user_config_filepath:
user_config_filepath = find_user_config_file_in(home_directory)
# If user config file is found, read the config file
# This overwrites previously declared emtpy `user_config` global variable
if user_config_filepath:
# pylint: disable=redefined-outer-name
user_config = read_config(user_config_filepath)
set_user_config(user_config)
initialized = True
return initialized
# Just run basic initializtion for the first time
initialize_config_from_expected_paths()
# Simple helper function for getting config
[docs]def get_config() -> Config:
return config
# Simple helper function for getting user config
[docs]def get_user_config() -> Config:
return user_config
# Flag value for additional logging for debugging purpose (mainly in development process)
# Dump config object to string
[docs]def dump_config(
config: Config,
compact: bool = False,
indent: int = 4,
) -> str:
# pylint: disable=redefined-outer-name
hocon = HOCONConverter.to_hocon(config, compact=compact, indent=indent)
return hocon
# Save config to file
[docs]def save_config(
filename: Union[PathLike, str],
config: Optional[Config] = None,
compact: bool = False,
indent: int = 4,
encoding: Optional[str] = None,
):
# pylint: disable=redefined-outer-name
if config is None:
config = get_config()
if encoding is None:
encoding = default_encoding
hocon = dump_config(config, compact=compact, indent=indent)
with open(filename, "w", encoding=encoding) as f:
f.write(hocon)
# Save user config to file (without default fallbacks)
[docs]def save_user_config(
filename: Optional[Union[PathLike, str]] = None,
user_config: Optional[Config] = None,
compact: bool = False,
indent: int = 4,
encoding: Optional[str] = None,
):
# pylint: disable=redefined-outer-name
if filename is None:
filename = default_user_config_filepath
if user_config is None:
user_config = get_user_config()
if encoding is None:
encoding = default_encoding
save_config(filename, user_config, compact, indent, encoding)
# Helper functions for getting python executables below
[docs]def get_executable_from_conda_envname(envname: str) -> str:
return subprocess.check_output(
[
"conda",
"run",
"-n",
envname,
"python",
"-c",
"import sys; print(sys.executable)",
],
encoding=sys.stdout.encoding,
creationflags=subprocess.CREATE_NO_WINDOW,
).strip()
[docs]def get_executable_from_conda_envpath(envpath: str) -> str:
return subprocess.check_output(
[
"conda",
"run",
"-p",
envpath,
"python",
"-c",
"import sys; print(sys.executable)",
],
encoding=sys.stdout.encoding,
creationflags=subprocess.CREATE_NO_WINDOW,
).strip()
[docs]def get_executable_from_executable_config(executable_config: Config) -> Optional[str]:
if isinstance(executable_config, str):
return executable_config
if isinstance(executable_config, dict):
if "path" in executable_config:
return executable_config["path"]
if "conda" in executable_config:
conda_config = executable_config["conda"]
if isinstance(conda_config, str):
envname = conda_config
return get_executable_from_conda_envname(envname)
if isinstance(conda_config, dict):
if "name" in conda_config:
envname = conda_config["name"]
return get_executable_from_conda_envname(envname)
if "path" in conda_config:
envpath = conda_config["path"]
return get_executable_from_conda_envpath(envpath)
[docs]def get_32bit_executable() -> Optional[str]:
if is_32bit():
return sys.executable
executable_config = config.get("koapy.python.executable.32bit")
return get_executable_from_executable_config(executable_config)
[docs]def get_64bit_executable() -> Optional[str]:
if is_64bit():
return sys.executable
executable_config = config.get("koapy.python.executable.64bit")
return get_executable_from_executable_config(executable_config)
