Entry point for bisect sample comparison.

tracing/tracing/metrics/compare_samples.py

Index: tracing/tracing/metrics/compare_samples.py
diff --git a/tracing/tracing/metrics/compare_samples.py b/tracing/tracing/metrics/compare_samples.py
new file mode 100644
index 0000000000000000000000000000000000000000..75d03b027bade7f7b2efe3b1b583e176f45eca42
--- /dev/null
+++ b/tracing/tracing/metrics/compare_samples.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# Copyright (c) 2015 The Chromium Authors. All rights reserved.

[eakuefner, 2016/07/21 19:35:34]

nit: no c

[RobertoCN, 2016/09/02 21:19:30]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import sys
+import tempfile
+
+import tracing_project
+import vinn
+
+
+def CompareSamples(sample_a, sample_b, metric, method='compareCharts'):
+  project = tracing_project.TracingProject()
+  temp_out = tempfile.TemporaryFile()
+
+  cmd = """
+  HTMLImportsLoader.loadHTML('/tracing/metrics/compare_samples.html');
+  var results = tr.metrics.BisectComparison.%s('%s', '%s', '%s');
+  console.log(JSON.stringify(results));
+  """ % (method, sample_a, sample_b, metric)
+  try:
+    res = vinn.RunJsString(
+        cmd, source_paths=list(project.source_paths),
+        stdout=temp_out)
+  except:
+    temp_out.seek(0)
+    print temp_out.read()  # Stack trace gets dumped here.
+    raise
+  temp_out.seek(0)
+  return res.returncode, temp_out.read()
+
+
+def Main(argv):
+  parser = argparse.ArgumentParser(
+      description='Compare samples.')
+  parser.add_argument('sample_a', type=str,
+                      help='comma-separated list of paths to valuesets from '
+                      'sample a')

[eakuefner, 2016/07/21 19:35:34]

nit: should be indented with the first ' above

[RobertoCN, 2016/09/02 21:19:30]

Done.

+  parser.add_argument('sample_b', type=str,
+                      help='comma-separated list of paths to valuesets from '
+                      'sample b')
+  parser.add_argument('metric', type=str,
+                      help='name of the metric to compare')
+  args = parser.parse_args(argv[1:])
+
+  error_code, output = CompareSamples(args.sample_a, args.sample_b, args.metric)
+  print output
+  sys.exit(error_code)