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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/dns/context_host_resolver.h"
#include <string>
#include <utility>
#include <vector>
#include "base/check_op.h"
#include "base/strings/string_piece.h"
#include "base/time/tick_clock.h"
#include "net/base/net_errors.h"
#include "net/base/network_anonymization_key.h"
#include "net/dns/dns_config.h"
#include "net/dns/host_cache.h"
#include "net/dns/host_resolver.h"
#include "net/dns/host_resolver_manager.h"
#include "net/dns/host_resolver_proc.h"
#include "net/dns/public/host_resolver_results.h"
#include "net/dns/public/resolve_error_info.h"
#include "net/dns/resolve_context.h"
#include "net/log/net_log_with_source.h"
#include "net/url_request/url_request_context.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "url/scheme_host_port.h"
namespace net {
ContextHostResolver::ContextHostResolver(
HostResolverManager* manager,
std::unique_ptr<ResolveContext> resolve_context)
: manager_(manager), resolve_context_(std::move(resolve_context)) {
DCHECK(manager_);
DCHECK(resolve_context_);
manager_->RegisterResolveContext(resolve_context_.get());
}
ContextHostResolver::ContextHostResolver(
std::unique_ptr<HostResolverManager> owned_manager,
std::unique_ptr<ResolveContext> resolve_context)
: ContextHostResolver(owned_manager.get(), std::move(resolve_context)) {
owned_manager_ = std::move(owned_manager);
}
ContextHostResolver::~ContextHostResolver() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (owned_manager_)
DCHECK_EQ(owned_manager_.get(), manager_);
// No |resolve_context_| to deregister if OnShutdown() was already called.
if (resolve_context_)
manager_->DeregisterResolveContext(resolve_context_.get());
}
void ContextHostResolver::OnShutdown() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(resolve_context_);
manager_->DeregisterResolveContext(resolve_context_.get());
resolve_context_.reset();
DCHECK(!shutting_down_);
shutting_down_ = true;
}
std::unique_ptr<HostResolver::ResolveHostRequest>
ContextHostResolver::CreateRequest(
url::SchemeHostPort host,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource source_net_log,
absl::optional<ResolveHostParameters> optional_parameters) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (shutting_down_)
return HostResolver::CreateFailingRequest(ERR_CONTEXT_SHUT_DOWN);
return manager_->CreateRequest(
Host(std::move(host)), std::move(network_anonymization_key),
std::move(source_net_log), std::move(optional_parameters),
resolve_context_.get(), resolve_context_->host_cache());
}
std::unique_ptr<HostResolver::ResolveHostRequest>
ContextHostResolver::CreateRequest(
const HostPortPair& host,
const NetworkAnonymizationKey& network_anonymization_key,
const NetLogWithSource& source_net_log,
const absl::optional<ResolveHostParameters>& optional_parameters) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (shutting_down_)
return HostResolver::CreateFailingRequest(ERR_CONTEXT_SHUT_DOWN);
return manager_->CreateRequest(
host, network_anonymization_key, source_net_log, optional_parameters,
resolve_context_.get(), resolve_context_->host_cache());
}
std::unique_ptr<HostResolver::ProbeRequest>
ContextHostResolver::CreateDohProbeRequest() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (shutting_down_)
return HostResolver::CreateFailingProbeRequest(ERR_CONTEXT_SHUT_DOWN);
return manager_->CreateDohProbeRequest(resolve_context_.get());
}
std::unique_ptr<HostResolver::MdnsListener>
ContextHostResolver::CreateMdnsListener(const HostPortPair& host,
DnsQueryType query_type) {
return manager_->CreateMdnsListener(host, query_type);
}
HostCache* ContextHostResolver::GetHostCache() {
return resolve_context_->host_cache();
}
base::Value::Dict ContextHostResolver::GetDnsConfigAsValue() const {
return manager_->GetDnsConfigAsValue();
}
void ContextHostResolver::SetRequestContext(
URLRequestContext* request_context) {
DCHECK(!shutting_down_);
DCHECK(resolve_context_);
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
resolve_context_->set_url_request_context(request_context);
}
HostResolverManager* ContextHostResolver::GetManagerForTesting() {
return manager_;
}
const URLRequestContext* ContextHostResolver::GetContextForTesting() const {
return resolve_context_ ? resolve_context_->url_request_context() : nullptr;
}
handles::NetworkHandle ContextHostResolver::GetTargetNetworkForTesting() const {
return resolve_context_ ? resolve_context_->GetTargetNetwork()
: handles::kInvalidNetworkHandle;
}
size_t ContextHostResolver::LastRestoredCacheSize() const {
return resolve_context_->host_cache()
? resolve_context_->host_cache()->last_restore_size()
: 0;
}
size_t ContextHostResolver::CacheSize() const {
return resolve_context_->host_cache() ? resolve_context_->host_cache()->size()
: 0;
}
void ContextHostResolver::SetHostResolverSystemParamsForTest(
const HostResolverSystemTask::Params& host_resolver_system_params) {
manager_->set_host_resolver_system_params_for_test( // IN-TEST
host_resolver_system_params);
}
void ContextHostResolver::SetTickClockForTesting(
const base::TickClock* tick_clock) {
manager_->SetTickClockForTesting(tick_clock);
if (resolve_context_->host_cache())
resolve_context_->host_cache()->set_tick_clock_for_testing(tick_clock);
}
} // namespace net
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