Add support for multiple output formatters for telemetry results.

tools/telemetry/telemetry/results/results_options.py

Index: tools/telemetry/telemetry/results/results_options.py
diff --git a/tools/telemetry/telemetry/results/results_options.py b/tools/telemetry/telemetry/results/results_options.py
index f7501d282bc8585d6f2c339a18e387537ff27f79..368cd83ee46001c54a5f797bc879177619206928 100644
--- a/tools/telemetry/telemetry/results/results_options.py
+++ b/tools/telemetry/telemetry/results/results_options.py
@@ -25,13 +25,14 @@ def AddResultsOptions(parser):
   group = optparse.OptionGroup(parser, 'Results options')
   group.add_option('--chartjson', action='store_true',
                    help='Output Chart JSON. Ignores --output-format.')
-  group.add_option('--output-format',
-                    default=_OUTPUT_FORMAT_CHOICES[0],
+  group.add_option('--output-format', action='append', dest='output_formats',
+                    default=[_OUTPUT_FORMAT_CHOICES[0]],
                     choices=_OUTPUT_FORMAT_CHOICES,
                     help='Output format. Defaults to "%%default". '
                     'Can be %s.' % ', '.join(_OUTPUT_FORMAT_CHOICES))
   group.add_option('-o', '--output',
                     dest='output_file',
+                    default=None,
                     help='Redirects output to a file. Defaults to stdout.')
   group.add_option('--output-trace-tag',
                     default='',
@@ -49,77 +50,86 @@ def AddResultsOptions(parser):
   parser.add_option_group(group)
 
 
+def _GetOutputStream(output_format, output_file):
+  assert output_format in _OUTPUT_FORMAT_CHOICES, 'Must specify a valid format.'
+  assert output_format not in ('gtest', 'none'), (
+      'Cannot set stream for \'gtest\' or \'none\' output formats.')
+
+  if output_file is None:
+    if output_format != 'html' and output_format != 'json':
+      return sys.stdout
+    output_file = os.path.join(util.GetBaseDir(), 'results.' + output_format)
+
+  output_file = os.path.expanduser(output_file)
+  open(output_file, 'a').close()  # Create file if it doesn't exist.
+  return open(output_file, 'r+')
+
+
+def _GetProgressReporter(output_skipped_tests_summary, suppress_gtest_report):
+  if suppress_gtest_report:
+    return progress_reporter.ProgressReporter()
+
+  return gtest_progress_reporter.GTestProgressReporter(
+      sys.stdout, output_skipped_tests_summary=output_skipped_tests_summary)
+
+
 def CreateResults(benchmark_metadata, options):
   """
   Args:
     options: Contains the options specified in AddResultsOptions.
   """
-  # TODO(chrishenry): This logic prevents us from having multiple
-  # OutputFormatters. We should have an output_file per OutputFormatter.
-  # Maybe we should have --output-dir instead of --output-file?
-  if options.output_format == 'html' and not options.output_file:
-    options.output_file = os.path.join(util.GetBaseDir(), 'results.html')
-  elif options.output_format == 'json' and not options.output_file:
-    options.output_file = os.path.join(util.GetBaseDir(), 'results.json')
-
-  if hasattr(options, 'output_file') and options.output_file:
-    output_file = os.path.expanduser(options.output_file)
-    open(output_file, 'a').close()  # Create file if it doesn't exist.
-    output_stream = open(output_file, 'r+')
-  else:
-    output_stream = sys.stdout
-  if not hasattr(options, 'output_format'):
-    options.output_format = _OUTPUT_FORMAT_CHOICES[0]
-  if not hasattr(options, 'output_trace_tag'):
-    options.output_trace_tag = ''
+  # TODO(chrishenry): It doesn't make sense to have a single output_file flag
+  # with multiple output formatters. We should explore other possible options:
+  #   - Have an output_file per output formatter
+  #   - Have --output-dir instead of --output-file
+  if len(options.output_formats) != 1 and options.output_file:
+    raise Exception('Cannot specify output_file flag with multiple output '
+                    'formats.')
 
   output_formatters = []
-  output_skipped_tests_summary = True
-  reporter = None
-  if options.output_format == 'none' or options.chartjson:
-    pass
-  elif options.output_format == 'csv':
-    output_formatters.append(csv_output_formatter.CsvOutputFormatter(
-        output_stream))
-  elif options.output_format == 'buildbot':
-    output_formatters.append(buildbot_output_formatter.BuildbotOutputFormatter(
-        output_stream, trace_tag=options.output_trace_tag))
-  elif options.output_format == 'gtest':
-    # TODO(chrishenry): This is here to not change the output of
-    # gtest. Let's try enabling skipped tests summary for gtest test
-    # results too (in a separate patch), and see if we break anything.
-    output_skipped_tests_summary = False
-  elif options.output_format == 'html':
-    # TODO(chrishenry): We show buildbot output so that users can grep
-    # through the results easily without needing to open the html
-    # file.  Another option for this is to output the results directly
-    # in gtest-style results (via some sort of progress reporter),
-    # as we plan to enable gtest-style output for all output formatters.
-    output_formatters.append(buildbot_output_formatter.BuildbotOutputFormatter(
-        sys.stdout, trace_tag=options.output_trace_tag))
-    output_formatters.append(html_output_formatter.HtmlOutputFormatter(
-        output_stream, benchmark_metadata, options.reset_results,
-        options.upload_results, options.browser_type,
-        options.results_label, trace_tag=options.output_trace_tag))
-  elif options.output_format == 'json':
-    output_formatters.append(
-        json_output_formatter.JsonOutputFormatter(output_stream,
-                                                  benchmark_metadata))
-  elif options.output_format == 'chartjson':
-    output_formatters.append(
-        chart_json_output_formatter.ChartJsonOutputFormatter(
-            output_stream,
-            benchmark_metadata))
-  else:
-    # Should never be reached. The parser enforces the choices.
-    raise Exception('Invalid --output-format "%s". Valid choices are: %s'
-                    % (options.output_format,
-                       ', '.join(_OUTPUT_FORMAT_CHOICES)))
-
-  if options.suppress_gtest_report:
-    reporter = progress_reporter.ProgressReporter()
-  else:
-    reporter = gtest_progress_reporter.GTestProgressReporter(
-        sys.stdout, output_skipped_tests_summary=output_skipped_tests_summary)
+  for output_format in options.output_formats:
+    if output_format == 'none' or output_format == "gtest" or options.chartjson:
+      continue
+
+    output_stream = _GetOutputStream(output_format, options.output_file)
+    if output_format == 'csv':
+      output_formatters.append(csv_output_formatter.CsvOutputFormatter(
+          output_stream))
+    elif output_format == 'buildbot':
+      output_formatters.append(
+          buildbot_output_formatter.BuildbotOutputFormatter(
+              output_stream, trace_tag=options.output_trace_tag))
+    elif output_format == 'html':
+      # TODO(chrishenry): We show buildbot output so that users can grep
+      # through the results easily without needing to open the html
+      # file.  Another option for this is to output the results directly
+      # in gtest-style results (via some sort of progress reporter),
+      # as we plan to enable gtest-style output for all output formatters.
+      output_formatters.append(
+          buildbot_output_formatter.BuildbotOutputFormatter(
+              sys.stdout, trace_tag=options.output_trace_tag))
+      output_formatters.append(html_output_formatter.HtmlOutputFormatter(
+          output_stream, benchmark_metadata, options.reset_results,
+          options.upload_results, options.browser_type,
+          options.results_label, trace_tag=options.output_trace_tag))
+    elif output_format == 'json':
+      output_formatters.append(json_output_formatter.JsonOutputFormatter(
+          output_stream, benchmark_metadata))
+    elif output_format == 'chartjson':
+      output_formatters.append(
+          chart_json_output_formatter.ChartJsonOutputFormatter(
+              output_stream, benchmark_metadata))
+    else:
+      # Should never be reached. The parser enforces the choices.
+      raise Exception('Invalid --output-format "%s". Valid choices are: %s'
+                      % (output_format, ', '.join(_OUTPUT_FORMAT_CHOICES)))
+
+  # TODO(chrishenry): This is here to not change the output of
+  # gtest. Let's try enabling skipped tests summary for gtest test
+  # results too (in a separate patch), and see if we break anything.
+  output_skipped_tests_summary = 'gtest' in options.output_formats
+
+  reporter = _GetProgressReporter(output_skipped_tests_summary,
+                                  options.suppress_gtest_report)
   return page_test_results.PageTestResults(
       output_formatters=output_formatters, progress_reporter=reporter)