510 lines
16 KiB
Python
510 lines
16 KiB
Python
import abc
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import enum
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import inspect
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import logging
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import time
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any, Dict, List, Optional
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from mako import exceptions
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from mako.lookup import TemplateLookup
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from mako.template import Template
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from core.config import Configuration
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from core.errors import CoreCommandError, CoreError
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from core.nodes.base import CoreNode
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logger = logging.getLogger(__name__)
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TEMPLATES_DIR: str = "templates"
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def get_template_path(file_path: Path) -> str:
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"""
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Utility to convert a given file path to a valid template path format.
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:param file_path: file path to convert
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:return: template path
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"""
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if file_path.is_absolute():
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template_path = str(file_path.relative_to("/"))
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else:
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template_path = str(file_path)
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return template_path
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class ConfigServiceMode(enum.Enum):
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BLOCKING = 0
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NON_BLOCKING = 1
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TIMER = 2
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class ConfigServiceBootError(Exception):
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pass
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class ConfigServiceTemplateError(Exception):
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pass
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@dataclass
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class ShadowDir:
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path: str
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src: Optional[str] = None
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templates: bool = False
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has_node_paths: bool = False
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class ConfigService(abc.ABC):
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"""
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Base class for creating configurable services.
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"""
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# validation period in seconds, how frequent validation is attempted
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validation_period: float = 0.5
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# time to wait in seconds for determining if service started successfully
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validation_timer: int = 5
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# directories to shadow and copy files from
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shadow_directories: List[ShadowDir] = []
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def __init__(self, node: CoreNode) -> None:
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"""
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Create ConfigService instance.
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:param node: node this service is assigned to
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"""
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self.node: CoreNode = node
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class_file = inspect.getfile(self.__class__)
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templates_path = Path(class_file).parent.joinpath(TEMPLATES_DIR)
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self.templates: TemplateLookup = TemplateLookup(directories=templates_path)
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self.config: Dict[str, Configuration] = {}
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self.custom_templates: Dict[str, str] = {}
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self.custom_config: Dict[str, str] = {}
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configs = self.default_configs[:]
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self._define_config(configs)
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@staticmethod
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def clean_text(text: str) -> str:
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"""
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Returns space stripped text for string literals, while keeping space
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indentations.
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:param text: text to clean
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:return: cleaned text
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"""
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return inspect.cleandoc(text)
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@property
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@abc.abstractmethod
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def name(self) -> str:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def group(self) -> str:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def directories(self) -> List[str]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def files(self) -> List[str]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def default_configs(self) -> List[Configuration]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def modes(self) -> Dict[str, Dict[str, str]]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def executables(self) -> List[str]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def dependencies(self) -> List[str]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def startup(self) -> List[str]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def validate(self) -> List[str]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def shutdown(self) -> List[str]:
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raise NotImplementedError
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@property
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@abc.abstractmethod
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def validation_mode(self) -> ConfigServiceMode:
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raise NotImplementedError
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def start(self) -> None:
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"""
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Creates services files/directories, runs startup, and validates based on
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validation mode.
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:return: nothing
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:raises ConfigServiceBootError: when there is an error starting service
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"""
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logger.info("node(%s) service(%s) starting...", self.node.name, self.name)
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self.create_shadow_dirs()
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self.create_dirs()
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self.create_files()
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wait = self.validation_mode == ConfigServiceMode.BLOCKING
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self.run_startup(wait)
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if not wait:
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if self.validation_mode == ConfigServiceMode.TIMER:
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self.wait_validation()
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else:
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self.run_validation()
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def stop(self) -> None:
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"""
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Stop service using shutdown commands.
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:return: nothing
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"""
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for cmd in self.shutdown:
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try:
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self.node.cmd(cmd)
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except CoreCommandError:
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logger.exception(
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f"node({self.node.name}) service({self.name}) "
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f"failed shutdown: {cmd}"
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)
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def restart(self) -> None:
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"""
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Restarts service by running stop and then start.
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:return: nothing
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"""
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self.stop()
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self.start()
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def create_shadow_dirs(self) -> None:
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"""
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Creates a shadow of a host system directory recursively
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to be mapped and live within a node.
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:return: nothing
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:raises CoreError: when there is a failure creating a directory or file
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"""
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for shadow_dir in self.shadow_directories:
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# setup shadow and src paths, using node unique paths when configured
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shadow_path = Path(shadow_dir.path)
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if shadow_dir.src is None:
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src_path = shadow_path
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else:
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src_path = Path(shadow_dir.src)
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if shadow_dir.has_node_paths:
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src_path = src_path / self.node.name
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# validate shadow and src paths
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if not shadow_path.is_absolute():
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raise CoreError(f"shadow dir({shadow_path}) is not absolute")
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if not src_path.is_absolute():
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raise CoreError(f"shadow source dir({src_path}) is not absolute")
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if not src_path.is_dir():
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raise CoreError(f"shadow source dir({src_path}) does not exist")
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# create root of the shadow path within node
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logger.info(
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"node(%s) creating shadow directory(%s) src(%s) node paths(%s) "
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"templates(%s)",
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self.node.name,
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shadow_path,
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src_path,
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shadow_dir.has_node_paths,
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shadow_dir.templates,
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)
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self.node.create_dir(shadow_path)
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# find all directories and files to create
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dir_paths = []
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file_paths = []
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for path in src_path.rglob("*"):
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shadow_src_path = shadow_path / path.relative_to(src_path)
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if path.is_dir():
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dir_paths.append(shadow_src_path)
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else:
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file_paths.append((path, shadow_src_path))
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# create all directories within node
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for path in dir_paths:
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self.node.create_dir(path)
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# create all files within node, from templates when configured
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data = self.data()
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templates = TemplateLookup(directories=src_path)
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for path, dst_path in file_paths:
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if shadow_dir.templates:
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template = templates.get_template(path.name)
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rendered = self._render(template, data)
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self.node.create_file(dst_path, rendered)
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else:
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self.node.copy_file(path, dst_path)
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def create_dirs(self) -> None:
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"""
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Creates directories for service.
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:return: nothing
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:raises CoreError: when there is a failure creating a directory
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"""
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logger.debug("creating config service directories")
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for directory in sorted(self.directories):
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dir_path = Path(directory)
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try:
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self.node.create_dir(dir_path)
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except (CoreCommandError, CoreError):
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raise CoreError(
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f"node({self.node.name}) service({self.name}) "
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f"failure to create service directory: {directory}"
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)
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def data(self) -> Dict[str, Any]:
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"""
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Returns key/value data, used when rendering file templates.
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:return: key/value template data
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"""
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return {}
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def set_template(self, name: str, template: str) -> None:
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"""
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Store custom template to render for a given file.
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:param name: file to store custom template for
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:param template: custom template to render
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:return: nothing
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"""
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self.custom_templates[name] = template
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def get_text_template(self, name: str) -> str:
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"""
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Retrieves text based template for files that do not have a file based template.
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:param name: name of file to get template for
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:return: template to render
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"""
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raise CoreError(f"service({self.name}) unknown template({name})")
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def get_templates(self) -> Dict[str, str]:
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"""
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Retrieves mapping of file names to templates for all cases, which
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includes custom templates, file templates, and text templates.
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:return: mapping of files to templates
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"""
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templates = {}
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for file in self.files:
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file_path = Path(file)
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template_path = get_template_path(file_path)
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if file in self.custom_templates:
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template = self.custom_templates[file]
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template = self.clean_text(template)
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elif self.templates.has_template(template_path):
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template = self.templates.get_template(template_path).source
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else:
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try:
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template = self.get_text_template(file)
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except Exception as e:
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raise ConfigServiceTemplateError(
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f"node({self.node.name}) service({self.name}) file({file}) "
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f"failure getting template: {e}"
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)
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template = self.clean_text(template)
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templates[file] = template
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return templates
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def get_rendered_templates(self) -> Dict[str, str]:
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templates = {}
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data = self.data()
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for file in sorted(self.files):
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rendered = self._get_rendered_template(file, data)
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templates[file] = rendered
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return templates
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def _get_rendered_template(self, file: str, data: Dict[str, Any]) -> str:
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file_path = Path(file)
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template_path = get_template_path(file_path)
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if file in self.custom_templates:
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text = self.custom_templates[file]
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rendered = self.render_text(text, data)
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elif self.templates.has_template(template_path):
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rendered = self.render_template(template_path, data)
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else:
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try:
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text = self.get_text_template(file)
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except Exception as e:
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raise ConfigServiceTemplateError(
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f"node({self.node.name}) service({self.name}) file({file}) "
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f"failure getting template: {e}"
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)
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rendered = self.render_text(text, data)
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return rendered
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def create_files(self) -> None:
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"""
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Creates service files inside associated node.
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:return: nothing
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"""
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data = self.data()
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for file in sorted(self.files):
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logger.debug(
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"node(%s) service(%s) template(%s)", self.node.name, self.name, file
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)
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rendered = self._get_rendered_template(file, data)
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file_path = Path(file)
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self.node.create_file(file_path, rendered)
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def run_startup(self, wait: bool) -> None:
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"""
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Run startup commands for service on node.
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:param wait: wait successful command exit status when True, ignore status
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otherwise
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:return: nothing
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:raises ConfigServiceBootError: when a command that waits fails
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"""
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for cmd in self.startup:
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try:
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self.node.cmd(cmd, wait=wait)
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except CoreCommandError as e:
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raise ConfigServiceBootError(
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f"node({self.node.name}) service({self.name}) failed startup: {e}"
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)
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def wait_validation(self) -> None:
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"""
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Waits for a period of time to consider service started successfully.
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:return: nothing
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"""
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time.sleep(self.validation_timer)
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def run_validation(self) -> None:
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"""
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Runs validation commands for service on node.
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:return: nothing
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:raises ConfigServiceBootError: if there is a validation failure
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"""
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start = time.monotonic()
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cmds = self.validate[:]
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index = 0
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while cmds:
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cmd = cmds[index]
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try:
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self.node.cmd(cmd)
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del cmds[index]
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index += 1
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except CoreCommandError:
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logger.debug(
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f"node({self.node.name}) service({self.name}) "
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f"validate command failed: {cmd}"
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)
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time.sleep(self.validation_period)
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if cmds and time.monotonic() - start > self.validation_timer:
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raise ConfigServiceBootError(
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f"node({self.node.name}) service({self.name}) failed to validate"
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)
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def _render(self, template: Template, data: Dict[str, Any] = None) -> str:
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"""
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Renders template providing all associated data to template.
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:param template: template to render
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:param data: service specific defined data for template
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:return: rendered template
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"""
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if data is None:
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data = {}
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return template.render_unicode(
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node=self.node, config=self.render_config(), **data
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)
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def render_text(self, text: str, data: Dict[str, Any] = None) -> str:
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"""
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Renders text based template providing all associated data to template.
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:param text: text to render
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:param data: service specific defined data for template
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:return: rendered template
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"""
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text = self.clean_text(text)
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try:
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template = Template(text)
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return self._render(template, data)
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except Exception:
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raise CoreError(
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f"node({self.node.name}) service({self.name}) "
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f"{exceptions.text_error_template().render_unicode()}"
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)
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def render_template(self, template_path: str, data: Dict[str, Any] = None) -> str:
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"""
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Renders file based template providing all associated data to template.
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:param template_path: path of file to render
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:param data: service specific defined data for template
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:return: rendered template
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"""
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try:
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template = self.templates.get_template(template_path)
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return self._render(template, data)
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except Exception:
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raise CoreError(
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f"node({self.node.name}) service({self.name}) file({template_path})"
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f"{exceptions.text_error_template().render_unicode()}"
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)
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def _define_config(self, configs: List[Configuration]) -> None:
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"""
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Initializes default configuration data.
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:param configs: configs to initialize
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:return: nothing
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"""
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for config in configs:
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self.config[config.id] = config
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def render_config(self) -> Dict[str, str]:
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"""
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Returns configuration data key/value pairs for rendering a template.
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:return: nothing
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"""
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if self.custom_config:
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return self.custom_config
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else:
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return {k: v.default for k, v in self.config.items()}
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def set_config(self, data: Dict[str, str]) -> None:
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"""
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Set configuration data from key/value pairs.
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:param data: configuration key/values to set
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:return: nothing
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:raise CoreError: when an unknown configuration value is given
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"""
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for key, value in data.items():
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if key not in self.config:
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raise CoreError(f"unknown config: {key}")
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self.custom_config[key] = value
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