Andras Schmelczer
c55eba2077
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76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
import multiprocessing as mp
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import queue
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import traceback
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from typing import Dict, Iterable, List, TypeVar, Union
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from ..chunk import chunk
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from ..logger.get_logger import get_logger
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from .map_result import MapResult
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from .worker_exception import WorkerException
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logger = get_logger("parallel_map")
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T = TypeVar("T")
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V = TypeVar("V")
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def manage_communication(
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*,
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input_values: Iterable[T],
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chunk_size: int,
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input_queue: Union[mp.Queue, queue.Queue],
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output_queue: Union[mp.Queue, queue.Queue],
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unordered: bool,
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ignore_exceptions: bool,
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) -> Iterable[V]:
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chunks = iter(chunk(enumerate(input_values), chunk_size=chunk_size))
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indexed_results: Dict[int, V] = {}
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next_output_index = 0
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read_input_length = 0
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is_iteration_over = False
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while not is_iteration_over or next_output_index < read_input_length:
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if not is_iteration_over:
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try:
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next_chunk = next(chunks)
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input_queue.put(next_chunk)
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read_input_length += len(next_chunk)
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except StopIteration:
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is_iteration_over = True
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except Exception as e:
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if ignore_exceptions:
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logger.error(
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f"""Exception {e} encountered in input, traceback:\n{
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traceback.format_exc()
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}"""
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)
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else:
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raise
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try:
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result_chunk: List[MapResult] = output_queue.get_nowait()
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for r in result_chunk:
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if r.exception is not None:
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if ignore_exceptions:
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logger.error(
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f"""Exception {
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r.exception
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} encountered in worker, traceback:\n{r.worker_traceback}"""
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)
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else:
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raise WorkerException(r.exception)
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if unordered:
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yield r.value
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next_output_index += 1
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else:
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indexed_results[r.order] = r.value
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if not unordered:
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while next_output_index in indexed_results:
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yield indexed_results[next_output_index]
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del indexed_results[next_output_index]
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next_output_index += 1
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except queue.Empty:
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pass
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