Trace-based benchmarking via a mojo app.

apps/benchmark/args.cc

+// Copyright 2015 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.
+
+#include "apps/benchmark/args.h"
+
+#include <algorithm>
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+
+namespace benchmark {
+namespace {
+
+bool GetMeasurement(const std::string& measurement_spec, Measurement* result) {
+  // Measurements are described in the format:
+  // <measurement type>/<event category>/<event name>.
+  std::vector<std::string> parts;
+  base::SplitString(measurement_spec, '/', &parts);
+  if (parts.size() != 3) {
+    LOG(ERROR) << "Could not parse the measurement description: "
+               << measurement_spec;
+    return false;
+  }
+
+  if (parts[0] == "time_until") {
+    result->type = MeasurementType::TIME_UNTIL;
+  } else if (parts[0] == "avg_duration") {
+    result->type = MeasurementType::AVG_DURATION;
+  } else {
+    LOG(ERROR) << "Could not recognize the measurement type: " << parts[0];
+    return false;
+  }
+
+  result->target_event.category = parts[1];
+  result->target_event.name = parts[2];
+  result->spec = measurement_spec;
+  return true;
+}
+
+}  // namespace
+
+Args::Args() {}
+
+Args::~Args() {}
+
+bool GetArgs(const std::vector<std::string>& input_args, Args* result) {
+  base::CommandLine command_line(input_args);
+
+  result->app = command_line.GetSwitchValueASCII("app");
+  if (result->app.empty()) {
+    LOG(ERROR) << "The required --app argument is empty or missing.";
+    return false;
+  }
+
+  std::string duration_str = command_line.GetSwitchValueASCII("duration");
+  if (duration_str.empty()) {
+    LOG(ERROR) << "The required --duration argument is empty or missing.";
+    return false;
+  }
+  int duration_int;
+  if (!base::StringToInt(duration_str, &duration_int) || duration_int <= 0) {
+    LOG(ERROR) << "Could not parse the --duration value as a positive integer: "
+               << duration_str;
+    return false;
+  }
+  result->duration = base::TimeDelta::FromSeconds(duration_int);
+
+  // All regular arguments (not switches, ie. not preceded by "--") describe
+  // measurements.
+  for (const std::string& measurement_spec : command_line.GetArgs()) {
+    Measurement measurement;
+    if (!GetMeasurement(measurement_spec, &measurement)) {
+      return false;
+    }
+    result->measurements.push_back(measurement);
+  }
+
+  return true;
+}
+
+}  // namespace benchmark