flat -> src layout (#294)

- Some mypy fixes
- Flat layout -> src layout
- Ditch `setup.py` and `setup.cfg` in favour of `pyproject.toml`
- Non-pinned requirements moved from `requirements/*.in` to `pyproject.toml`

1 files changed, 43 insertions, 0 deletions

diff --git a/src/sec_certs/utils/parallel_processing.py b/src/sec_certs/utils/parallel_processing.py
new file mode 100644
index 00000000..50806a67
--- /dev/null
+++ b/src/sec_certs/utils/parallel_processing.py
@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+import time
+from multiprocessing.pool import ThreadPool
+from typing import Any, Callable, Iterable
+
+from billiard.pool import Pool
+
+from sec_certs.utils.tqdm import tqdm
+
+
+def process_parallel(
+    func: Callable,
+    items: Iterable,
+    max_workers: int,
+    callback: Callable | None = None,
+    use_threading: bool = True,
+    progress_bar: bool = True,
+    unpack: bool = False,
+    progress_bar_desc: str | None = None,
+) -> list[Any]:
+
+    pool: Pool | ThreadPool = ThreadPool(max_workers) if use_threading else Pool(max_workers)
+    results = (
+        [pool.apply_async(func, (*i,), callback=callback) for i in items]
+        if unpack
+        else [pool.apply_async(func, (i,), callback=callback) for i in items]
+    )
+
+    if progress_bar is True and items:
+        bar = tqdm(total=len(results), desc=progress_bar_desc)
+        while not all(all_done := [x.ready() for x in results]):
+            done_count = len(list(filter(lambda x: x, all_done)))
+            bar.update(done_count - bar.n)
+            time.sleep(1)
+        bar.update(len(results) - bar.n)
+        bar.close()
+
+    pool.close()
+    pool.join()
+    pool.terminate()
+
+    return [r.get() for r in results]