ENH: Add tool for downloading release wheels from Anaconda.

This is a simplified version of terryfy::wheel-uploader that has
two advantages over the original:

- It works with Anaconda where our wheels are now stored.
- It is simplified to match the NumPY workflow.

1 files changed, 79 insertions, 0 deletions

diff --git a/tools/download-wheels.py b/tools/download-wheels.py
new file mode 100644
index 000000000..68437d129
--- /dev/null
+++ b/tools/download-wheels.py
@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+"""
+Download NumPy wheels from Anaconda staging area.
+
+"""
+import sys
+import os
+import re
+import shutil
+import argparse
+
+import urllib3
+from bs4 import BeautifulSoup
+
+__version__ = '0.1'
+
+ANACONDA_INDEX = 'https://anaconda.org/multibuild-wheels-staging/numpy/files'
+ANACONDA_FILES = 'https://anaconda.org/multibuild-wheels-staging/numpy/simple'
+
+
+def get_wheel_names(version):
+    """ Get wheel names from Anaconda HTML directory.
+
+    This looks in the Anaconda multibuild-wheels-staging page and
+    parses the HTML to get all the wheel names for a release version.
+
+    Parameters
+    ----------
+    version : str
+        The release version. For instance, "1.18.3".
+
+    """
+    tmpl = re.compile('^.*numpy-' + version + '.*\.whl$')
+    http = urllib3.PoolManager(cert_reqs='CERT_REQUIRED')
+    indx = http.request('GET', ANACONDA_INDEX)
+    soup = BeautifulSoup(indx.data, 'html.parser')
+    return soup.findAll(text=tmpl)
+
+
+def download_wheels(version, wheelhouse):
+    """Download release wheels.
+
+    The release wheels for the given NumPy version are downloaded
+    into the given directory.
+
+    Parameters
+    ----------
+    version : str
+        The release version. For instance, "1.18.3".
+    wheelhouse : str
+        Directory in which to download the wheels.
+
+    """
+    wheel_names = get_wheel_names(version[0])
+    http = urllib3.PoolManager(cert_reqs='CERT_REQUIRED')
+    for wheel_name in wheel_names:
+        wheel_url = os.path.join(ANACONDA_FILES, wheel_name)
+        wheel_path = os.path.join(wheelhouse, wheel_name)
+        with open(wheel_path, 'wb') as f:
+            with http.request('GET', wheel_url, preload_content=False,) as r:
+                print(f"Downloading {wheel_name}")
+                shutil.copyfileobj(r, f)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "version",
+         help="NumPy version to download.")
+    parser.add_argument(
+        "-w", "--wheelhouse",
+        default=os.path.join(os.getcwd(), "release", "installers"),
+        help="Directory in which to store downloaded wheels\n"
+             "[defaults to <cwd>/release/installers]")
+
+    args = parser.parse_args()
+
+    wheelhouse = os.path.expanduser(args.wheelhouse)
+    download_wheels(args.version, wheelhouse)