add "download-imdb-dataset" command to CLI

unwind/__main__.py

@@ -6,7 +6,7 @@ from pathlib import Path
 from . import config
 from .db import close_connection_pool, open_connection_pool
 from .imdb import refresh_user_ratings_from_imdb
-from .imdb_import import import_from_file
+from .imdb_import import download_datasets, import_from_file
 
 log = logging.getLogger(__name__)
 
@@ -31,6 +31,10 @@ async def run_import_imdb_dataset(basics_path: Path, ratings_path: Path):
     await close_connection_pool()
 
 
+async def run_download_imdb_dataset(basics_path: Path, ratings_path: Path):
+    await download_datasets(basics_path=basics_path, ratings_path=ratings_path)
+
+
 def getargs():
     parser = argparse.ArgumentParser()
     commands = parser.add_subparsers(required=True)
@@ -55,6 +59,25 @@ def getargs():
         "--ratings", metavar="ratings_file.tsv.gz", type=Path, required=True
     )
 
+    parser_download_imdb_dataset = commands.add_parser(
+        "download-imdb-dataset",
+        help="Download IMDb datasets.",
+        description="""
+            Download IMDb datasets.
+        """,
+    )
+    parser_download_imdb_dataset.add_argument(
+        dest="mode",
+        action="store_const",
+        const="download-imdb-dataset",
+    )
+    parser_download_imdb_dataset.add_argument(
+        "--basics", metavar="basics_file.tsv.gz", type=Path, required=True
+    )
+    parser_download_imdb_dataset.add_argument(
+        "--ratings", metavar="ratings_file.tsv.gz", type=Path, required=True
+    )
+
     parser_load_user_ratings_from_imdb = commands.add_parser(
         "load-user-ratings-from-imdb",
         help="Load user ratings from imdb.com.",
@@ -94,6 +117,8 @@ def main():
         asyncio.run(run_load_user_ratings_from_imdb())
     elif args.mode == "import-imdb-dataset":
         asyncio.run(run_import_imdb_dataset(args.basics, args.ratings))
+    elif args.mode == "download-imdb-dataset":
+        asyncio.run(run_download_imdb_dataset(args.basics, args.ratings))
 
 
 main()

unwind/imdb_import.py

@@ -1,3 +1,4 @@
+import asyncio
 import csv
 import gzip
 import logging
@@ -236,7 +237,23 @@ async def import_from_file(*, basics_path: Path, ratings_path: Path):
     await db.set_import_progress(100)
 
 
-async def load_from_web(*, force: bool = False):
+async def download_datasets(*, basics_path: Path, ratings_path: Path) -> None:
+    """Download IMDb movie database dumps.
+
+    See https://www.imdb.com/interfaces/ and https://datasets.imdbws.com/ for
+    more information on the IMDb database dumps.
+    """
+    basics_url = "https://datasets.imdbws.com/title.basics.tsv.gz"
+    ratings_url = "https://datasets.imdbws.com/title.ratings.tsv.gz"
+
+    async with request.asession():
+        await asyncio.gather(
+            request.adownload(ratings_url, to_path=ratings_path, only_if_newer=True),
+            request.adownload(basics_url, to_path=basics_path, only_if_newer=True),
+        )
+
+
+async def load_from_web(*, force: bool = False) -> None:
     """Refresh the full IMDb movie database.
 
     The latest dumps are first downloaded and then imported into the database.
@@ -249,17 +266,13 @@ async def load_from_web(*, force: bool = False):
     await db.set_import_progress(0)
 
     try:
-        basics_url = "https://datasets.imdbws.com/title.basics.tsv.gz"
-        ratings_url = "https://datasets.imdbws.com/title.ratings.tsv.gz"
         ratings_file = config.datadir / "imdb/title.ratings.tsv.gz"
         basics_file = config.datadir / "imdb/title.basics.tsv.gz"
 
         ratings_mtime = ratings_file.stat().st_mtime if ratings_file.exists() else None
         bastics_mtime = basics_file.stat().st_mtime if basics_file.exists() else None
 
-        with request.session():
+        await download_datasets(basics_path=basics_file, ratings_path=ratings_file)
-            request.download(ratings_url, ratings_file, only_if_newer=True)
-            request.download(basics_url, basics_file, only_if_newer=True)
 
         is_changed = (
             ratings_mtime != ratings_file.stat().st_mtime