blob: 1e8c1352ca27ad75d0a4e2c93ff097ee7c09fe53 [file] [log] [blame]
// 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 <memory>
#include <unordered_set>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "base/sequence_checker.h"
#include "base/values.h"
#include "net/base/net_export.h"
#include "net/base/network_handle.h"
#include "net/base/network_isolation_key.h"
#include "net/dns/host_resolver.h"
#include "net/dns/host_resolver_system_task.h"
#include "net/log/net_log_with_source.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "url/scheme_host_port.h"
namespace base {
class TickClock;
} // namespace base
namespace net {
class HostCache;
class HostResolverManager;
class ResolveContext;
class URLRequestContext;
// Wrapper for HostResolverManager, expected to be owned by a URLRequestContext,
// that sets per-URLRequestContext parameters for created requests. Except for
// tests, typically only interacted with through the HostResolver interface.
// See HostResolver::Create[...]() methods for construction.
class NET_EXPORT ContextHostResolver : public HostResolver {
// Creates a ContextHostResolver that forwards all of its requests through
// |manager|. Requests will be cached using |host_cache| if not null.
ContextHostResolver(HostResolverManager* manager,
std::unique_ptr<ResolveContext> resolve_context);
// Same except the created resolver will own its own HostResolverManager.
ContextHostResolver(std::unique_ptr<HostResolverManager> owned_manager,
std::unique_ptr<ResolveContext> resolve_context);
ContextHostResolver(const ContextHostResolver&) = delete;
ContextHostResolver& operator=(const ContextHostResolver&) = delete;
~ContextHostResolver() override;
// HostResolver methods:
void OnShutdown() override;
std::unique_ptr<ResolveHostRequest> CreateRequest(
url::SchemeHostPort host,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource net_log,
absl::optional<ResolveHostParameters> optional_parameters) override;
std::unique_ptr<ResolveHostRequest> CreateRequest(
const HostPortPair& host,
const NetworkAnonymizationKey& network_anonymization_key,
const NetLogWithSource& net_log,
const absl::optional<ResolveHostParameters>& optional_parameters)
std::unique_ptr<ProbeRequest> CreateDohProbeRequest() override;
std::unique_ptr<MdnsListener> CreateMdnsListener(
const HostPortPair& host,
DnsQueryType query_type) override;
HostCache* GetHostCache() override;
base::Value::Dict GetDnsConfigAsValue() const override;
void SetRequestContext(URLRequestContext* request_context) override;
HostResolverManager* GetManagerForTesting() override;
const URLRequestContext* GetContextForTesting() const override;
handles::NetworkHandle GetTargetNetworkForTesting() const override;
// Returns the number of host cache entries that were restored, or 0 if there
// is no cache.
size_t LastRestoredCacheSize() const;
// Returns the number of entries in the host cache, or 0 if there is no cache.
size_t CacheSize() const;
void SetHostResolverSystemParamsForTest(
const HostResolverSystemTask::Params& host_resolver_system_params);
void SetTickClockForTesting(const base::TickClock* tick_clock);
ResolveContext* resolve_context_for_testing() {
return resolve_context_.get();
std::unique_ptr<HostResolverManager> owned_manager_;
// `manager_` might point to `owned_manager_`. It must be declared last and
// cleared first.
const raw_ptr<HostResolverManager> manager_;
std::unique_ptr<ResolveContext> resolve_context_;
// If true, the context is shutting down. Subsequent request Start() calls
// will always fail immediately with ERR_CONTEXT_SHUT_DOWN.
bool shutting_down_ = false;
} // namespace net