Created
May 6, 2019 06:31
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import logging, pathlib, json, sys, subprocess, os | |
from .. import version | |
from .logging import root_logger as logger | |
class Config(object): | |
def __init__(self): | |
self.config = {"log_level": "INFO"} | |
def __getattr__(self, attr): | |
try: | |
return self.config[attr] | |
except KeyError: | |
return None | |
def __setattr__(self, attr, value): | |
if attr in ["log", "config"]: | |
super(Config, self).__setattr__(attr, value) | |
else: | |
self.config[attr] = value | |
class Source: | |
def __init__(self, parent_logger=logger): | |
self.log = parent_logger.getChild(self.__class__.__name__) | |
self.config = Config() | |
class FileConfigSource(Source): | |
def __init__(self, *args, path="config.json", required=False, **kwargs): | |
super(FileConfigSource, self).__init__(*args, **kwargs) | |
self._load_config(path, required=required) | |
def _load_config(self, path, required=False): | |
path = pathlib.Path(path) | |
self.log.info("Looking for config file. ({}required)- {}".format("" if required else " not", path)) | |
if path.is_file(): | |
self.log.info("Found. Loading.") | |
with open(path, 'r') as f: | |
config = json.load(f) | |
self.log.debug(config) | |
self.config.config.update(config) | |
else: | |
log = "Not found." | |
if required: | |
self.log.fatal(log) | |
raise FileNotFoundError(path) | |
else: | |
self.log.info(log) | |
class GCloudFileConfigSource(FileConfigSource): | |
def __init__(self, *args, **kwargs): | |
project_name = self._get_cloud_project_name() | |
super(GCloudFileConfigSource, self).__init__( | |
*args, | |
path="{}.json".format(project_name), | |
required=False, | |
**kwargs | |
) | |
@staticmethod | |
def _get_cloud_project_name(): | |
call = "gcloud config get-value project" | |
result = subprocess.check_output(call.split(" "), stderr=open(os.devnull, 'wb')) | |
project_name = result.decode('utf-8').strip() | |
return project_name | |
class EnvironmentalVariableConfigSource(Source): | |
def __init__(self, *args, **kwargs): | |
super(EnvironmentalVariableConfigSource, self).__init__(*args, **kwargs) | |
environmental_variable_config = self._get_environmental_key_values() | |
self.log.info("Checking for environmental variables. - {}_<KEY>".format(version.NAME.upper())) | |
if environmental_variable_config: | |
self.log.info(environmental_variable_config) | |
self.config.config.update(environmental_variable_config) | |
@staticmethod | |
def _get_environmental_key_values(): | |
def parse_environmental_variables(): | |
prefix = version.NAME.upper() + "_" | |
for key in os.environ: | |
if key.startswith(prefix) and len(key) > len(prefix): | |
value = os.environ[key] | |
key = key[len(prefix):].lower() | |
yield key, value | |
return dict(parse_environmental_variables()) | |
class CliConfigSource(Source): | |
def __init__(self, *args, **kwargs): | |
super(CliConfigSource, self).__init__(*args, **kwargs) | |
cli_config = self._get_cli_config() | |
self.log.debug(cli_config) | |
# if config file specified, load that | |
if 'config' in cli_config: | |
self.log.info("Config file specified. - {}".format(cli_config['config'])) | |
file_config = FileConfigSource(path=cli_config['config'], required=True, parent_logger=self.log) | |
self.config.config.update(file_config.config) | |
self.config.config.update(cli_config) | |
@staticmethod | |
def _get_cli_config(): | |
def get_cli_key_vals(): | |
for i, arg in enumerate(sys.argv): | |
if "--" in arg and len(sys.argv)-1 > i: | |
key = arg[2:] | |
value = sys.argv[i+1] | |
yield key, value | |
return dict(get_cli_key_vals()) | |
class SourceCombiner(Source): | |
def __init__(self, sources, *args, **kwargs): | |
super(SourceCombiner, self).__init__(*args, **kwargs) | |
for source in sources: | |
config = source(parent_logger=self.log) | |
self.config.config.update(config.config.config) |
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