mirror of
https://github.com/freqtrade/freqtrade.git
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112 lines
3.5 KiB
Python
112 lines
3.5 KiB
Python
"""
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This module contain functions to load the configuration file
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"""
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import logging
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import re
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import sys
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from copy import deepcopy
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from pathlib import Path
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from typing import Any, Dict, List
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import rapidjson
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from freqtrade.constants import MINIMAL_CONFIG
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from freqtrade.exceptions import OperationalException
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from freqtrade.misc import deep_merge_dicts
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logger = logging.getLogger(__name__)
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CONFIG_PARSE_MODE = rapidjson.PM_COMMENTS | rapidjson.PM_TRAILING_COMMAS
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def log_config_error_range(path: str, errmsg: str) -> str:
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"""
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Parses configuration file and prints range around error
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"""
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if path != '-':
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offsetlist = re.findall(r'(?<=Parse\serror\sat\soffset\s)\d+', errmsg)
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if offsetlist:
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offset = int(offsetlist[0])
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text = Path(path).read_text()
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# Fetch an offset of 80 characters around the error line
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subtext = text[offset-min(80, offset):offset+80]
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segments = subtext.split('\n')
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if len(segments) > 3:
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# Remove first and last lines, to avoid odd truncations
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return '\n'.join(segments[1:-1])
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else:
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return subtext
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return ''
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def load_file(path: Path) -> Dict[str, Any]:
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try:
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with path.open('r') as file:
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config = rapidjson.load(file, parse_mode=CONFIG_PARSE_MODE)
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except FileNotFoundError:
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raise OperationalException(f'File "{path}" not found!')
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return config
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def load_config_file(path: str) -> Dict[str, Any]:
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"""
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Loads a config file from the given path
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:param path: path as str
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:return: configuration as dictionary
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"""
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try:
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# Read config from stdin if requested in the options
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with open(path) if path != '-' else sys.stdin as file:
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config = rapidjson.load(file, parse_mode=CONFIG_PARSE_MODE)
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except FileNotFoundError:
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raise OperationalException(
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f'Config file "{path}" not found!'
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' Please create a config file or check whether it exists.')
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except rapidjson.JSONDecodeError as e:
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err_range = log_config_error_range(path, str(e))
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raise OperationalException(
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f'{e}\n'
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f'Please verify the following segment of your configuration:\n{err_range}'
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if err_range else 'Please verify your configuration file for syntax errors.'
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)
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return config
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def load_from_files(files: List[str], base_path: Path = None, level: int = 0) -> Dict[str, Any]:
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"""
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Recursively load configuration files if specified.
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Sub-files are assumed to be relative to the initial config.
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"""
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config: Dict[str, Any] = {}
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if level > 5:
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raise OperationalException("Config loop detected.")
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if not files:
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return deepcopy(MINIMAL_CONFIG)
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# We expect here a list of config filenames
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for filename in files:
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logger.info(f'Using config: {filename} ...')
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if filename == '-':
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# Immediately load stdin and return
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return load_config_file(filename)
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file = Path(filename)
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if base_path:
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# Prepend basepath to allow for relative assignments
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file = base_path / file
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config_tmp = load_config_file(str(file))
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if 'files' in config_tmp:
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config_sub = load_from_files(config_tmp['files'], file.resolve().parent, level + 1)
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deep_merge_dicts(config_sub, config_tmp)
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# Merge config options, overwriting prior values
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config = deep_merge_dicts(config_tmp, config)
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config['config_files'] = files
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return config
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