Use module name and raw data filename as the local filename

python/paddle/v2/dataset/common.py

+import requests
 import hashlib
 import os
 import shutil
-import urllib2
 
 __all__ = ['DATA_HOME', 'download', 'md5file']
 
@@ -11,31 +11,6 @@ if not os.path.exists(DATA_HOME):
     os.makedirs(DATA_HOME)
 
 
-def download(url, package_name, md5):
-    filename = os.path.split(url)[-1]
-    assert DATA_HOME is not None
-    filepath = os.path.join(DATA_HOME, md5)
-    if not os.path.exists(filepath):
-        os.makedirs(filepath)
-    __full_file__ = os.path.join(filepath, filename)
-
-    def __file_ok__():
-        if not os.path.exists(__full_file__):
-            return False
-        md5_hash = hashlib.md5()
-        with open(__full_file__, 'rb') as f:
-            for chunk in iter(lambda: f.read(4096), b""):
-                md5_hash.update(chunk)
-
-        return md5_hash.hexdigest() == md5
-
-    while not __file_ok__():
-        response = urllib2.urlopen(url)
-        with open(__full_file__, mode='wb') as of:
-            shutil.copyfileobj(fsrc=response, fdst=of)
-    return __full_file__
-
-
 def md5file(fname):
     hash_md5 = hashlib.md5()
     f = open(fname, "rb")
@@ -43,3 +18,18 @@ def md5file(fname):
         hash_md5.update(chunk)
     f.close()
     return hash_md5.hexdigest()
+
+
+def download(url, module_name, md5sum):
+    dirname = os.path.join(DATA_HOME, module_name)
+    if not os.path.exists(dirname):
+        os.makedirs(dirname)
+
+    filename = os.path.join(dirname, url.split('/')[-1])
+    if not (os.path.exists(filename) and md5file(filename) == md5sum):
+        # If file doesn't exist or MD5 doesn't match, then download.
+        r = requests.get(url, stream=True)
+        with open(filename, 'w') as f:
+            shutil.copyfileobj(r.raw, f)
+
+    return filename

python/paddle/v2/dataset/tests/common_test.py

@@ -5,12 +5,18 @@ import tempfile
 class TestCommon(unittest.TestCase):
     def test_md5file(self):
         _, temp_path =tempfile.mkstemp()
-        f = open(temp_path, 'w')
-        f.write("Hello\n")
-        f.close()
+        with open(temp_path, 'w') as f:
+            f.write("Hello\n")
         self.assertEqual(
             '09f7e02f1290be211da707a266f153b3',
             paddle.v2.dataset.common.md5file(temp_path))
 
+    def test_download(self):
+        yi_avatar = 'https://avatars0.githubusercontent.com/u/1548775?v=3&s=460'
+        self.assertEqual(
+            paddle.v2.dataset.common.DATA_HOME + '/test/1548775?v=3&s=460',
+            paddle.v2.dataset.common.download(
+                yi_avatar, 'test', 'f75287202d6622414c706c36c16f8e0d'))
+
 if __name__ == '__main__':
     unittest.main()