1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
// 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/memory/raw_ptr.h"
#include "base/sequence_checker.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/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;
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(const ContextHostResolver&) = delete;
ContextHostResolver& operator=(const ContextHostResolver&) = delete;
~ContextHostResolver() override;
// HostResolver methods:
void OnShutdown() override;
std::unique_ptr<ResolveHostRequest> CreateRequest(
url::SchemeHostPort host,
NetworkIsolationKey network_isolation_key,
NetLogWithSource net_log,
absl::optional<ResolveHostParameters> optional_parameters) override;
std::unique_ptr<ResolveHostRequest> CreateRequest(
const HostPortPair& host,
const NetworkIsolationKey& network_isolation_key,
const NetLogWithSource& net_log,
const absl::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;
base::Value 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 SetProcParamsForTesting(const ProcTaskParams& proc_params);
void SetTickClockForTesting(const base::TickClock* tick_clock);
ResolveContext* resolve_context_for_testing() {
return resolve_context_.get();
}
private:
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;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace net
#endif // NET_DNS_CONTEXT_HOST_RESOLVER_H_
|
