Add coverage

tools/telemetry/third_party/coverage/ci/download_appveyor.py

Index: tools/telemetry/third_party/coverage/ci/download_appveyor.py
diff --git a/tools/telemetry/third_party/coverage/ci/download_appveyor.py b/tools/telemetry/third_party/coverage/ci/download_appveyor.py
new file mode 100644
index 0000000000000000000000000000000000000000..a4ef8d531b5e436b3c713a19def21608198c8359
--- /dev/null
+++ b/tools/telemetry/third_party/coverage/ci/download_appveyor.py
@@ -0,0 +1,95 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
+"""Use the Appveyor API to download Windows artifacts."""
+
+import os
+import os.path
+import sys
+import zipfile
+
+import requests
+
+
+def make_auth_headers():
+    """Make the authentication headers needed to use the Appveyor API."""
+    with open("ci/appveyor.token") as f:
+        token = f.read().strip()
+
+    headers = {
+        'Authorization': 'Bearer {}'.format(token),
+    }
+    return headers
+
+
+def make_url(url, **kwargs):
+    """Build an Appveyor API url."""
+    return "https://ci.appveyor.com/api" + url.format(**kwargs)
+
+
+def get_project_build(account_project):
+    """Get the details of the latest Appveyor build."""
+    url = make_url("/projects/{account_project}", account_project=account_project)
+    response = requests.get(url, headers=make_auth_headers())
+    return response.json()
+
+
+def download_latest_artifacts(account_project):
+    """Download all the artifacts from the latest build."""
+    build = get_project_build(account_project)
+    jobs = build['build']['jobs']
+    print "Build {0[build][version]}, {1} jobs: {0[build][message]}".format(build, len(jobs))
+    for job in jobs:
+        name = job['name'].partition(':')[2].split(',')[0].strip()
+        print "  {0}: {1[status]}, {1[artifactsCount]} artifacts".format(name, job)
+
+        url = make_url("/buildjobs/{jobid}/artifacts", jobid=job['jobId'])
+        response = requests.get(url, headers=make_auth_headers())
+        artifacts = response.json()
+
+        for artifact in artifacts:
+            is_zip = artifact['type'] == "Zip"
+            filename = artifact['fileName']
+            print "    {0}, {1} bytes".format(filename, artifact['size'])
+
+            url = make_url(
+                "/buildjobs/{jobid}/artifacts/{filename}",
+                jobid=job['jobId'],
+                filename=filename
+            )
+            download_url(url, filename, make_auth_headers())
+
+            if is_zip:
+                unpack_zipfile(filename)
+                os.remove(filename)
+
+
+def ensure_dirs(filename):
+    """Make sure the directories exist for `filename`."""
+    dirname, _ = os.path.split(filename)
+    if dirname and not os.path.exists(dirname):
+        os.makedirs(dirname)
+
+
+def download_url(url, filename, headers):
+    """Download a file from `url` to `filename`."""
+    ensure_dirs(filename)
+    response = requests.get(url, headers=headers, stream=True)
+    if response.status_code == 200:
+        with open(filename, 'wb') as f:
+            for chunk in response.iter_content(16*1024):
+                f.write(chunk)
+
+
+def unpack_zipfile(filename):
+    """Unpack a zipfile, using the names in the zip."""
+    with open(filename, 'rb') as fzip:
+        z = zipfile.ZipFile(fzip)
+        for name in z.namelist():
+            print "      extracting {}".format(name)
+            ensure_dirs(name)
+            z.extract(name)
+
+
+if __name__ == "__main__":
+    download_latest_artifacts(sys.argv[1])