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// Copyright (c) 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_CONTEXT_HOST_RESOLVER_H_
#define NET_DNS_CONTEXT_HOST_RESOLVER_H_
#include <memory>
#include <unordered_set>
#include <vector>
#include "base/macros.h"
#include "base/sequence_checker.h"
#include "net/base/net_export.h"
#include "net/dns/host_resolver.h"
namespace base {
class TickClock;
} // namespace base
namespace net {
class HostCache;
class HostResolverManager;
struct ProcTaskParams;
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 {
public:
// 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() override;
// HostResolver methods:
void OnShutdown() override;
std::unique_ptr<ResolveHostRequest> CreateRequest(
const HostPortPair& host,
const NetworkIsolationKey& network_isolation_key,
const NetLogWithSource& net_log,
const base::Optional<ResolveHostParameters>& optional_parameters)
override;
std::unique_ptr<ProbeRequest> CreateDohProbeRequest() override;
std::unique_ptr<MdnsListener> CreateMdnsListener(
const HostPortPair& host,
DnsQueryType query_type) override;
HostCache* GetHostCache() override;
std::unique_ptr<base::Value> GetDnsConfigAsValue() const override;
void SetRequestContext(URLRequestContext* request_context) override;
HostResolverManager* GetManagerForTesting() override;
const URLRequestContext* GetContextForTesting() 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 SetProcParamsForTesting(const ProcTaskParams& proc_params);
void SetTickClockForTesting(const base::TickClock* tick_clock);
size_t GetNumActiveRequestsForTesting() const {
return handed_out_requests_.size();
}
private:
class WrappedRequest;
class WrappedResolveHostRequest;
class WrappedProbeRequest;
HostResolverManager* const manager_;
std::unique_ptr<HostResolverManager> owned_manager_;
// Requests are expected to clear themselves from this set on destruction or
// cancellation. Requests in an early shutdown state (from
// HostResolver::OnShutdown()) are still in this set, so they can be notified
// on resolver destruction.
std::unordered_set<WrappedRequest*> handed_out_requests_;
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;
SEQUENCE_CHECKER(sequence_checker_);
DISALLOW_COPY_AND_ASSIGN(ContextHostResolver);
};
} // namespace net
#endif // NET_DNS_CONTEXT_HOST_RESOLVER_H_
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