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/*
* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "test/scoped_key_value_config.h"
#include "rtc_base/checks.h"
#include "system_wrappers/include/field_trial.h"
#include "test/field_trial.h"
namespace {
// This part is copied from system_wrappers/field_trial.cc.
void InsertIntoMap(
std::map<std::string, std::string, std::less<>>& key_value_map,
absl::string_view s) {
std::string::size_type field_start = 0;
while (field_start < s.size()) {
std::string::size_type separator_pos = s.find('/', field_start);
RTC_CHECK_NE(separator_pos, std::string::npos)
<< "Missing separator '/' after field trial key.";
RTC_CHECK_GT(separator_pos, field_start)
<< "Field trial key cannot be empty.";
std::string key(s.substr(field_start, separator_pos - field_start));
field_start = separator_pos + 1;
RTC_CHECK_LT(field_start, s.size())
<< "Missing value after field trial key. String ended.";
separator_pos = s.find('/', field_start);
RTC_CHECK_NE(separator_pos, std::string::npos)
<< "Missing terminating '/' in field trial string.";
RTC_CHECK_GT(separator_pos, field_start)
<< "Field trial value cannot be empty.";
std::string value(s.substr(field_start, separator_pos - field_start));
field_start = separator_pos + 1;
key_value_map[key] = value;
}
// This check is technically redundant due to earlier checks.
// We nevertheless keep the check to make it clear that the entire
// string has been processed, and without indexing past the end.
RTC_CHECK_EQ(field_start, s.size());
}
} // namespace
namespace webrtc {
namespace test {
ScopedKeyValueConfig::ScopedKeyValueConfig()
: ScopedKeyValueConfig(nullptr, "") {}
ScopedKeyValueConfig::ScopedKeyValueConfig(absl::string_view s)
: ScopedKeyValueConfig(nullptr, s) {}
ScopedKeyValueConfig::ScopedKeyValueConfig(ScopedKeyValueConfig& parent,
absl::string_view s)
: ScopedKeyValueConfig(&parent, s) {}
ScopedKeyValueConfig::ScopedKeyValueConfig(ScopedKeyValueConfig* parent,
absl::string_view s)
: parent_(parent), leaf_(nullptr) {
InsertIntoMap(key_value_map_, s);
if (!s.empty()) {
// Also store field trials in global string (until we get rid of it).
scoped_field_trials_ = std::make_unique<ScopedFieldTrials>(s);
}
if (parent == nullptr) {
// We are root, set leaf_.
leaf_ = this;
} else {
// Link root to new leaf.
GetRoot(parent)->leaf_ = this;
RTC_DCHECK(leaf_ == nullptr);
}
}
ScopedKeyValueConfig::~ScopedKeyValueConfig() {
if (parent_) {
GetRoot(parent_)->leaf_ = parent_;
}
}
ScopedKeyValueConfig* ScopedKeyValueConfig::GetRoot(ScopedKeyValueConfig* n) {
while (n->parent_ != nullptr) {
n = n->parent_;
}
return n;
}
std::string ScopedKeyValueConfig::GetValue(absl::string_view key) const {
if (parent_ == nullptr) {
return leaf_->LookupRecurse(key);
} else {
return LookupRecurse(key);
}
}
std::string ScopedKeyValueConfig::LookupRecurse(absl::string_view key) const {
auto it = key_value_map_.find(key);
if (it != key_value_map_.end())
return it->second;
if (parent_) {
return parent_->LookupRecurse(key);
}
// When at the root, check the global string so that test programs using
// a mix between ScopedKeyValueConfig and the global string continue to work
return field_trial::FindFullName(std::string(key));
}
} // namespace test
} // namespace webrtc
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