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1c8103d4db
This new class implements the existing FieldTrialsView interface, extending it with the verification functionality. For now, the verification will only be performed if the rtc_strict_field_trials GN arg is set. Most classes extending FieldTrialsView today have been converted to extend from FieldTrialsRegistry instead to automatically perform verification. Bug: webrtc:14154 Change-Id: I4819724cd66a04507e62fcc2bb1019187b6ba8c7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/276270 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Emil Lundmark <lndmrk@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38453}
122 lines
3.8 KiB
C++
122 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020 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 "test/scoped_key_value_config.h"
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#include "rtc_base/checks.h"
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#include "system_wrappers/include/field_trial.h"
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#include "test/field_trial.h"
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namespace {
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// This part is copied from system_wrappers/field_trial.cc.
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void InsertIntoMap(
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std::map<std::string, std::string, std::less<>>& key_value_map,
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absl::string_view s) {
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std::string::size_type field_start = 0;
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while (field_start < s.size()) {
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std::string::size_type separator_pos = s.find('/', field_start);
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RTC_CHECK_NE(separator_pos, std::string::npos)
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<< "Missing separator '/' after field trial key.";
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RTC_CHECK_GT(separator_pos, field_start)
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<< "Field trial key cannot be empty.";
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std::string key(s.substr(field_start, separator_pos - field_start));
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field_start = separator_pos + 1;
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RTC_CHECK_LT(field_start, s.size())
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<< "Missing value after field trial key. String ended.";
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separator_pos = s.find('/', field_start);
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RTC_CHECK_NE(separator_pos, std::string::npos)
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<< "Missing terminating '/' in field trial string.";
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RTC_CHECK_GT(separator_pos, field_start)
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<< "Field trial value cannot be empty.";
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std::string value(s.substr(field_start, separator_pos - field_start));
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field_start = separator_pos + 1;
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key_value_map[key] = value;
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}
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// This check is technically redundant due to earlier checks.
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// We nevertheless keep the check to make it clear that the entire
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// string has been processed, and without indexing past the end.
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RTC_CHECK_EQ(field_start, s.size());
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}
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} // namespace
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namespace webrtc {
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namespace test {
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ScopedKeyValueConfig::ScopedKeyValueConfig()
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: ScopedKeyValueConfig(nullptr, "") {}
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ScopedKeyValueConfig::ScopedKeyValueConfig(absl::string_view s)
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: ScopedKeyValueConfig(nullptr, s) {}
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ScopedKeyValueConfig::ScopedKeyValueConfig(ScopedKeyValueConfig& parent,
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absl::string_view s)
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: ScopedKeyValueConfig(&parent, s) {}
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ScopedKeyValueConfig::ScopedKeyValueConfig(ScopedKeyValueConfig* parent,
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absl::string_view s)
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: parent_(parent), leaf_(nullptr) {
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InsertIntoMap(key_value_map_, s);
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if (!s.empty()) {
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// Also store field trials in global string (until we get rid of it).
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scoped_field_trials_ = std::make_unique<ScopedFieldTrials>(s);
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}
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if (parent == nullptr) {
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// We are root, set leaf_.
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leaf_ = this;
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} else {
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// Link root to new leaf.
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GetRoot(parent)->leaf_ = this;
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RTC_DCHECK(leaf_ == nullptr);
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}
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}
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ScopedKeyValueConfig::~ScopedKeyValueConfig() {
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if (parent_) {
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GetRoot(parent_)->leaf_ = parent_;
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}
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}
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ScopedKeyValueConfig* ScopedKeyValueConfig::GetRoot(ScopedKeyValueConfig* n) {
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while (n->parent_ != nullptr) {
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n = n->parent_;
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}
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return n;
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}
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std::string ScopedKeyValueConfig::GetValue(absl::string_view key) const {
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if (parent_ == nullptr) {
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return leaf_->LookupRecurse(key);
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} else {
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return LookupRecurse(key);
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}
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}
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std::string ScopedKeyValueConfig::LookupRecurse(absl::string_view key) const {
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auto it = key_value_map_.find(key);
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if (it != key_value_map_.end())
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return it->second;
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if (parent_) {
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return parent_->LookupRecurse(key);
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}
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// When at the root, check the global string so that test programs using
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// a mix between ScopedKeyValueConfig and the global string continue to work
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return webrtc::field_trial::FindFullName(std::string(key));
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}
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} // namespace test
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} // namespace webrtc
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