84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
import logging
|
|
import pathlib
|
|
from pathlib import Path
|
|
from typing import Dict, List, Type
|
|
|
|
from core import utils
|
|
from core.configservice.base import ConfigService
|
|
from core.errors import CoreError
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class ConfigServiceManager:
|
|
"""
|
|
Manager for configurable services.
|
|
"""
|
|
|
|
def __init__(self):
|
|
"""
|
|
Create a ConfigServiceManager instance.
|
|
"""
|
|
self.services: Dict[str, Type[ConfigService]] = {}
|
|
|
|
def get_service(self, name: str) -> Type[ConfigService]:
|
|
"""
|
|
Retrieve a service by name.
|
|
|
|
:param name: name of service
|
|
:return: service class
|
|
:raises CoreError: when service is not found
|
|
"""
|
|
service_class = self.services.get(name)
|
|
if service_class is None:
|
|
raise CoreError(f"service does not exit {name}")
|
|
return service_class
|
|
|
|
def add(self, service: Type[ConfigService]) -> None:
|
|
"""
|
|
Add service to manager, checking service requirements have been met.
|
|
|
|
:param service: service to add to manager
|
|
:return: nothing
|
|
:raises CoreError: when service is a duplicate or has unmet executables
|
|
"""
|
|
name = service.name
|
|
logger.debug(
|
|
"loading service: class(%s) name(%s)", service.__class__.__name__, name
|
|
)
|
|
|
|
# avoid duplicate services
|
|
if name in self.services:
|
|
raise CoreError(f"duplicate service being added: {name}")
|
|
|
|
# validate dependent executables are present
|
|
for executable in service.executables:
|
|
try:
|
|
utils.which(executable, required=True)
|
|
except CoreError as e:
|
|
raise CoreError(f"config service({service.name}): {e}")
|
|
|
|
# make service available
|
|
self.services[name] = service
|
|
|
|
def load(self, path: Path) -> List[str]:
|
|
"""
|
|
Search path provided for configurable services and add them for being managed.
|
|
|
|
:param path: path to search configurable services
|
|
:return: list errors when loading and adding services
|
|
"""
|
|
path = pathlib.Path(path)
|
|
subdirs = [x for x in path.iterdir() if x.is_dir()]
|
|
subdirs.append(path)
|
|
service_errors = []
|
|
for subdir in subdirs:
|
|
logger.debug("loading config services from: %s", subdir)
|
|
services = utils.load_classes(subdir, ConfigService)
|
|
for service in services:
|
|
try:
|
|
self.add(service)
|
|
except CoreError as e:
|
|
service_errors.append(service.name)
|
|
logger.debug("not loading service(%s): %s", service.name, e)
|
|
return service_errors
|