Add logdog_helper script.

build/android/pylib/utils/logdog_helper.py

+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Helper functions to upload data to logdog."""
+
+import os
+import sys
+
+from pylib import constants
+from pylib.utils import python_utils
+
+sys.path.insert(0, os.path.abspath(os.path.join(
+    constants.DIR_SOURCE_ROOT, 'tools', 'swarming_client')))
+from libs.logdog import bootstrap # pylint: disable=import-error
+
+
+@python_utils.NoRaiseException(default_return_value='')

[mikecase (-- gone --), 2017/01/30 23:20:49]

Currently, all of the logdog code is surrounded in things like

try:
  logdog code
except Exception:
  logging.exception('Unknown error')

I added a helper to do this on all the logdog helper functions.

+def text(name, data):
+  """Uploads text to logdog.
+
+  Args:
+    name: Name of the logdog stream.
+    data: String with data you want to upload.
+
+  Returns:
+    Link to view uploaded text in logdog viewer.
+  """
+  with get_logdog_client().text(name) as stream:
+    stream.write(data)
+    return stream.get_viewer_url()
+
+
+@python_utils.NoRaiseException(default_return_value=None)
+def open_text(name):
+  """Returns a file like object which you can write to.
+
+  Args:
+    name: Name of the logdog stream.
+
+  Returns:
+    A file like object. close() file when done.
+  """
+  return get_logdog_client().open_text(name)
+
+
+@python_utils.NoRaiseException(default_return_value='')
+def binary(name, binary_path):
+  """Uploads binary to logdog.
+
+  Args:
+    name: Name of the logdog stream.
+    binary_path: Path to binary you want to upload.
+
+  Returns:
+    Link to view uploaded binary in logdog viewer.
+  """
+  with get_logdog_client().binary(name) as stream:
+    with open(binary_path, 'r') as f:
+      stream.write(f.read())
+      return stream.get_viewer_url()
+
+
+@python_utils.NoRaiseException(default_return_value='')
+def get_viewer_url(name):
+  """Get Logdog viewer URL.
+
+  Args:
+    name: Name of the logdog stream.
+
+  Returns:
+    Link to view uploaded binary in logdog viewer.
+  """
+  return get_logdog_client().get_viewer_url(name)
+
+
+@python_utils.Memoize

[mikecase (-- gone --), 2017/01/30 23:20:49]

Pretty sure (99%) you only need to get the stream_client once. So I save it with
the Memoize decorator. 

[jbudorick, 2017/01/31 16:11:53]

I'm not sure I like this, though you may be right.

+def get_logdog_client():
+  return bootstrap.ButlerBootstrap.probe().stream_client()
+