From 9ac2e9937a58728fe90f9f523d4bde475bb1850a Mon Sep 17 00:00:00 2001
From: Andrey Zimovnov <zimovnov@gmail.com>
Date: Mon, 16 Oct 2017 02:09:05 +0300
Subject: [PATCH] downloader

---
 download_utils.py | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 download_utils.py

diff --git a/download_utils.py b/download_utils.py
new file mode 100644
index 0000000..ac4a43d
--- /dev/null
+++ b/download_utils.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+import threading
+import os
+import tqdm
+import requests
+
+kill_thread = threading.Event()
+
+
+def download_from_github(version, fn, target_dir):
+    url = "https://github.com/hse-aml/intro-to-dl/releases/download/{0}/{1}".format(version, fn)
+    r = requests.get(url, stream=True)
+    total_size = int(r.headers.get('content-length'))
+    full_fn = os.path.join(target_dir, fn)
+    with open(full_fn, 'wb') as f:
+        bar = tqdm.tqdm_notebook(total=total_size, unit='B', unit_scale=True)
+        for chunk in r.iter_content(32*1024):
+            f.write(chunk)
+            bar.update(len(chunk))
+            if kill_thread.is_set():
+                # master asks to stop
+                break
+    if os.path.getsize(full_fn) != total_size:
+        # not full download
+        os.remove(full_fn)
+
+
+def parallel_downloader(version, fns, target_dir):
+    kill_thread.clear()
+    os.system("mkdir -p {0}".format(target_dir))
+    threads = []
+    try:
+        for fn in fns:
+            t = threading.Thread(target=download_from_github, args=(version, fn, target_dir))
+            t.daemon = True
+            t.start()
+            threads.append(t)
+        for t in threads:
+            t.join()
+    except KeyboardInterrupt:
+        print("Killed")
+    finally:
+        kill_thread.set()
+        for t in threads:
+            t.join()
+    print("Done")