117 lines
5.2 KiB
Python
117 lines
5.2 KiB
Python
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import os
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import stat
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import sys
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from typing import Any, Dict, List, Tuple
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from meow_base.core.base_handler import BaseHandler
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from meow_base.core.base_recipe import BaseRecipe
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from meow_base.core.meow import valid_event
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from meow_base.functionality.validation import check_type, valid_dict, \
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valid_string, valid_dir_path
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from meow_base.core.vars import DEBUG_INFO, DEFAULT_JOB_QUEUE_DIR, \
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VALID_VARIABLE_NAME_CHARS, EVENT_RULE, EVENT_TYPE, \
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JOB_TYPE_BASH
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from meow_base.functionality.debug import setup_debugging, print_debug
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from meow_base.functionality.file_io import valid_path, make_dir, write_file, \
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lines_to_string
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from meow_base.functionality.parameterisation import parameterize_bash_script
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from meow_base.patterns.file_event_pattern import EVENT_TYPE_WATCHDOG
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class BashRecipe(BaseRecipe):
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# A path to the bash script used to create this recipe
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def __init__(self, name:str, recipe:Any, parameters:Dict[str,Any]={},
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requirements:Dict[str,Any]={}, source:str=""):
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"""BashRecipe Constructor. This is used to execute bash scripts,
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enabling anything not natively supported by MEOW."""
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super().__init__(name, recipe, parameters, requirements)
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self._is_valid_source(source)
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self.source = source
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def _is_valid_source(self, source:str)->None:
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"""Validation check for 'source' variable from main constructor."""
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if source:
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valid_path(source, extension=".sh", min_length=0)
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def _is_valid_recipe(self, recipe:List[str])->None:
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"""Validation check for 'recipe' variable from main constructor.
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Called within parent BaseRecipe constructor."""
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check_type(recipe, List, hint="BashRecipe.recipe")
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for line in recipe:
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check_type(line, str, hint="BashRecipe.recipe[line]")
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def _is_valid_parameters(self, parameters:Dict[str,Any])->None:
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"""Validation check for 'parameters' variable from main constructor.
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Called within parent BaseRecipe constructor."""
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valid_dict(parameters, str, Any, strict=False, min_length=0)
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for k in parameters.keys():
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valid_string(k, VALID_VARIABLE_NAME_CHARS)
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def _is_valid_requirements(self, requirements:Dict[str,Any])->None:
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"""Validation check for 'requirements' variable from main constructor.
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Called within parent BaseRecipe constructor."""
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valid_dict(requirements, str, Any, strict=False, min_length=0)
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for k in requirements.keys():
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valid_string(k, VALID_VARIABLE_NAME_CHARS)
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class BashHandler(BaseHandler):
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# Config option, above which debug messages are ignored
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debug_level:int
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# Where print messages are sent
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_print_target:Any
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def __init__(self, job_queue_dir:str=DEFAULT_JOB_QUEUE_DIR, name:str="",
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print:Any=sys.stdout, logging:int=0, pause_time:int=5)->None:
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"""BashHandler Constructor. This creates jobs to be executed as
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bash scripts. This does not run as a continuous thread to
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handle execution, but is invoked according to a factory pattern using
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the handle function. Note that if this handler is given to a MeowRunner
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object, the job_queue_dir will be overwridden by its"""
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super().__init__(name=name, pause_time=pause_time)
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self._is_valid_job_queue_dir(job_queue_dir)
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self.job_queue_dir = job_queue_dir
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self._print_target, self.debug_level = setup_debugging(print, logging)
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print_debug(self._print_target, self.debug_level,
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"Created new BashHandler instance", DEBUG_INFO)
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def valid_handle_criteria(self, event:Dict[str,Any])->Tuple[bool,str]:
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"""Function to determine given an event defintion, if this handler can
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process it or not. This handler accepts events from watchdog with
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Bash recipes"""
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try:
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valid_event(event)
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msg = ""
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if type(event[EVENT_RULE].recipe) != BashRecipe:
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msg = "Recipe is not a BashRecipe. "
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if event[EVENT_TYPE] != EVENT_TYPE_WATCHDOG:
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msg += f"Event type is not {EVENT_TYPE_WATCHDOG}."
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if msg:
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return False, msg
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else:
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return True, ""
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except Exception as e:
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return False, str(e)
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def _is_valid_job_queue_dir(self, job_queue_dir)->None:
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"""Validation check for 'job_queue_dir' variable from main
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constructor."""
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valid_dir_path(job_queue_dir, must_exist=False)
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if not os.path.exists(job_queue_dir):
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make_dir(job_queue_dir)
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def get_created_job_type(self)->str:
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return JOB_TYPE_BASH
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def create_job_recipe_file(self, job_dir:str, event:Dict[str,Any],
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params_dict:Dict[str,Any])->str:
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# parameterise recipe and write as executeable script
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base_script = parameterize_bash_script(
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event[EVENT_RULE].recipe.recipe, params_dict
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)
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base_file = os.path.join(job_dir, "recipe.sh")
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write_file(lines_to_string(base_script), base_file)
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os.chmod(base_file, stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH | stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH )
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return os.path.join("$(dirname $0)", "recipe.sh")
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