1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef SERVICES_NETWORK_MOJO_HOST_RESOLVER_IMPL_H_
6 #define SERVICES_NETWORK_MOJO_HOST_RESOLVER_IMPL_H_
7 
8 #include <list>
9 #include <memory>
10 #include <string>
11 
12 #include "base/component_export.h"
13 #include "base/macros.h"
14 #include "base/threading/thread_checker.h"
15 #include "mojo/public/cpp/bindings/pending_remote.h"
16 #include "net/log/net_log_with_source.h"
17 #include "services/proxy_resolver/public/mojom/proxy_resolver.mojom.h"
18 
19 namespace net {
20 class HostResolver;
21 class NetworkIsolationKey;
22 }  // namespace net
23 
24 namespace network {
25 
26 // MojoHostResolverImpl handles mojo host resolution requests from the Proxy
27 // Resolver Service. Inbound Mojo requests are sent to the HostResolver passed
28 // into the constructor. When destroyed, any outstanding resolver requests are
29 // cancelled. If a request's HostResolverRequestClient is shut down, the
30 // associated resolver request is cancelled.
31 //
32 // TODO(mmenke): Rename this to something that makes it clearer that this is
33 // just for use by the ProxyResolverFactoryMojo, or merge it into
34 // ProxyResolverFactoryMojo.
COMPONENT_EXPORT(NETWORK_SERVICE)35 class COMPONENT_EXPORT(NETWORK_SERVICE) MojoHostResolverImpl {
36  public:
37   // |resolver| is expected to outlive |this|.
38   MojoHostResolverImpl(net::HostResolver* resolver,
39                        const net::NetLogWithSource& net_log);
40   ~MojoHostResolverImpl();
41 
42   void Resolve(
43       const std::string& hostname,
44       const net::NetworkIsolationKey& network_isolation_key,
45       bool is_ex,
46       mojo::PendingRemote<proxy_resolver::mojom::HostResolverRequestClient>
47           client);
48 
49   bool request_in_progress() { return !pending_jobs_.empty(); }
50 
51  private:
52   class Job;
53 
54   // Removes |job| from the set of pending jobs.
55   void DeleteJob(std::list<Job>::iterator job);
56 
57   // Resolver for resolving incoming requests. Not owned.
58   net::HostResolver* resolver_;
59 
60   // The NetLogWithSource to be passed to |resolver_| for all requests.
61   const net::NetLogWithSource net_log_;
62 
63   // All pending jobs, so they can be cancelled when this service is destroyed.
64   std::list<Job> pending_jobs_;
65 
66   base::ThreadChecker thread_checker_;
67 
68   DISALLOW_COPY_AND_ASSIGN(MojoHostResolverImpl);
69 };
70 
71 }  // namespace network
72 
73 #endif  // SERVICES_NETWORK_MOJO_HOST_RESOLVER_IMPL_H_
74