94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
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/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/test/field_trial.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdio>
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#include <cstdlib>
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#include <map>
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#include <string>
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#include "webrtc/system_wrappers/include/field_trial.h"
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#include "webrtc/system_wrappers/include/field_trial_default.h"
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namespace webrtc {
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namespace {
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bool field_trials_initiated_ = false;
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} // namespace
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namespace test {
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// Note: this code is copied from src/base/metrics/field_trial.cc since the aim
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// is to mimic chromium --force-fieldtrials.
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void InitFieldTrialsFromString(const std::string& trials_string) {
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static const char kPersistentStringSeparator = '/';
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// Catch an error if this is called more than once.
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assert(!field_trials_initiated_);
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field_trials_initiated_ = true;
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if (trials_string.empty())
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return;
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size_t next_item = 0;
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std::map<std::string, std::string> field_trials;
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while (next_item < trials_string.length()) {
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size_t name_end = trials_string.find(kPersistentStringSeparator, next_item);
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if (name_end == trials_string.npos || next_item == name_end)
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break;
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size_t group_name_end = trials_string.find(kPersistentStringSeparator,
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name_end + 1);
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if (group_name_end == trials_string.npos || name_end + 1 == group_name_end)
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break;
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std::string name(trials_string, next_item, name_end - next_item);
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std::string group_name(trials_string, name_end + 1,
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group_name_end - name_end - 1);
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next_item = group_name_end + 1;
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// Fail if duplicate with different group name.
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if (field_trials.find(name) != field_trials.end() &&
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field_trials.find(name)->second != group_name) {
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break;
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}
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field_trials[name] = group_name;
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// Successfully parsed all field trials from the string.
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if (next_item == trials_string.length()) {
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webrtc::field_trial::InitFieldTrialsFromString(trials_string.c_str());
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return;
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}
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}
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// Using fprintf as LOG does not print when this is called early in main.
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fprintf(stderr, "Invalid field trials string.\n");
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// Using abort so it crashes in both debug and release mode.
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abort();
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}
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ScopedFieldTrials::ScopedFieldTrials(const std::string& config)
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: previous_field_trials_(webrtc::field_trial::GetFieldTrialString()) {
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assert(field_trials_initiated_);
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field_trials_initiated_ = false;
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current_field_trials_ = config;
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InitFieldTrialsFromString(current_field_trials_);
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}
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ScopedFieldTrials::~ScopedFieldTrials() {
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// Should still be initialized, since InitFieldTrials is called from ctor.
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// That's why we don't restore the flag.
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assert(field_trials_initiated_);
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webrtc::field_trial::InitFieldTrialsFromString(previous_field_trials_);
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}
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} // namespace test
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} // namespace webrtc
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