Release management using CircleCI (#3498)

* Release management using CircleCI

* Changelog updated

scripts/release_management/github-upload.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+
+# Upload a file to a GitHub draft release. --id and --file are required.
+# Optimized for CircleCI
+
+import json
+import os
+import re
+import argparse
+import mimetypes
+import httplib
+from base64 import b64encode
+
+
+def request(baseurl, path, mimetype, mimeencoding, data):
+  user_and_pass = b64encode(b"{0}:{1}".format(os.environ['GITHUB_USERNAME'], os.environ['GITHUB_TOKEN'])).decode("ascii")
+  
+  headers = {
+    'User-Agent': 'tenderbot',
+    'Accept': 'application/vnd.github.v3.raw+json',
+    'Authorization': 'Basic %s' % user_and_pass,
+    'Content-Type': mimetype,
+    'Content-Encoding': mimeencoding
+  }
+
+  conn = httplib.HTTPSConnection(baseurl, timeout=5)
+  conn.request('POST', path, data, headers)
+  response = conn.getresponse()
+  if response.status < 200 or response.status > 299:
+    print(response)
+    conn.close()
+    raise IOError(response.reason)
+  responsedata = response.read()
+  conn.close()
+  return json.loads(responsedata)
+
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser()
+  parser.add_argument("--id", help="GitHub release ID", required=True, type=int)
+  parser.add_argument("--file", default="/tmp/workspace/tendermint_{0}_{1}_{2}.zip".format(os.environ.get('CIRCLE_TAG'),os.environ.get('GOOS'),os.environ.get('GOARCH')), help="File to upload")
+  parser.add_argument("--return-id-only", help="Return only the release ID after upload to GitHub.", action='store_true')
+  args = parser.parse_args()
+
+  if not os.environ.has_key('GITHUB_USERNAME'):
+    raise parser.error('GITHUB_USERNAME not set.')
+
+  if not os.environ.has_key('GITHUB_TOKEN'):
+    raise parser.error('GITHUB_TOKEN not set.')
+
+  mimetypes.init()
+  filename = os.path.basename(args.file)
+  mimetype,mimeencoding = mimetypes.guess_type(filename, strict=False)
+  if mimetype is None:
+    mimetype = 'application/zip'
+  if mimeencoding is None:
+    mimeencoding = 'utf8'
+
+  with open(args.file,'rb') as f:
+    asset = f.read()
+
+  result = request('uploads.github.com', '/repos/tendermint/tendermint/releases/{0}/assets?name={1}'.format(args.id, filename), mimetype, mimeencoding, asset)
+
+  if args.return_id_only:
+    print(result['id'])
+  else:
+    print(result['browser_download_url'])
+